// This is an open source non-commercial project. Dear PVS-Studio, please check
// it. PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com

/*
 * syntax.c: code for syntax highlighting
 */

#include <assert.h>
#include <ctype.h>
#include <inttypes.h>
#include <stdbool.h>
#include <string.h>
#include <stdlib.h>

#include "nvim/vim.h"
#include "nvim/ascii.h"
#include "nvim/syntax.h"
#include "nvim/charset.h"
#include "nvim/eval.h"
#include "nvim/ex_cmds2.h"
#include "nvim/ex_docmd.h"
#include "nvim/fileio.h"
#include "nvim/fold.h"
#include "nvim/hashtab.h"
#include "nvim/indent_c.h"
#include "nvim/mbyte.h"
#include "nvim/memline.h"
#include "nvim/memory.h"
#include "nvim/message.h"
#include "nvim/misc1.h"
#include "nvim/keymap.h"
#include "nvim/garray.h"
#include "nvim/option.h"
#include "nvim/os_unix.h"
#include "nvim/path.h"
#include "nvim/macros.h"
#include "nvim/regexp.h"
#include "nvim/screen.h"
#include "nvim/strings.h"
#include "nvim/syntax_defs.h"
#include "nvim/terminal.h"
#include "nvim/ui.h"
#include "nvim/os/os.h"
#include "nvim/os/time.h"

static bool did_syntax_onoff = false;

/// Structure that stores information about a highlight group.
/// The ID of a highlight group is also called group ID.  It is the index in
/// the highlight_ga array PLUS ONE.
struct hl_group {
  char_u      *sg_name;         ///< highlight group name
  char_u      *sg_name_u;       ///< uppercase of sg_name
  int sg_attr;                  ///< Screen attr @see ATTR_ENTRY
  int sg_link;                  ///< link to this highlight group ID
  int sg_set;                   ///< combination of flags in \ref SG_SET
  scid_T sg_scriptID;           ///< script in which the group was last set
  // for terminal UIs
  int sg_cterm;                 ///< "cterm=" highlighting attr
  int sg_cterm_fg;              ///< terminal fg color number + 1
  int sg_cterm_bg;              ///< terminal bg color number + 1
  int sg_cterm_bold;            ///< bold attr was set for light color
  // for RGB UIs
  int sg_gui;                   ///< "gui=" highlighting attributes
                                ///< (combination of \ref HL_ATTRIBUTES)
  RgbValue sg_rgb_fg;           ///< RGB foreground color
  RgbValue sg_rgb_bg;           ///< RGB background color
  RgbValue sg_rgb_sp;           ///< RGB special color
  uint8_t *sg_rgb_fg_name;      ///< RGB foreground color name
  uint8_t *sg_rgb_bg_name;      ///< RGB background color name
  uint8_t *sg_rgb_sp_name;      ///< RGB special color name
};

/// \addtogroup SG_SET
/// @{
#define SG_CTERM        2       // cterm has been set
#define SG_GUI          4       // gui has been set
#define SG_LINK         8       // link has been set
/// @}

// highlight groups for 'highlight' option
static garray_T highlight_ga = GA_EMPTY_INIT_VALUE;

#define HL_TABLE() ((struct hl_group *)((highlight_ga.ga_data)))

#define MAX_HL_ID       20000   /* maximum value for a highlight ID. */

/* different types of offsets that are possible */
#define SPO_MS_OFF      0       /* match  start offset */
#define SPO_ME_OFF      1       /* match  end	offset */
#define SPO_HS_OFF      2       /* highl. start offset */
#define SPO_HE_OFF      3       /* highl. end	offset */
#define SPO_RS_OFF      4       /* region start offset */
#define SPO_RE_OFF      5       /* region end	offset */
#define SPO_LC_OFF      6       /* leading context offset */
#define SPO_COUNT       7

/* Flags to indicate an additional string for highlight name completion. */
static int include_none = 0;    /* when 1 include "nvim/None" */
static int include_default = 0; /* when 1 include "nvim/default" */
static int include_link = 0;    /* when 2 include "nvim/link" and "clear" */

/*
 * The "term", "cterm" and "gui" arguments can be any combination of the
 * following names, separated by commas (but no spaces!).
 */
static char *(hl_name_table[]) =
{"bold", "standout", "underline", "undercurl",
 "italic", "reverse", "inverse", "NONE"};
static int hl_attr_table[] =
{HL_BOLD, HL_STANDOUT, HL_UNDERLINE, HL_UNDERCURL, HL_ITALIC, HL_INVERSE,
 HL_INVERSE, 0};

/*
 * The patterns that are being searched for are stored in a syn_pattern.
 * A match item consists of one pattern.
 * A start/end item consists of n start patterns and m end patterns.
 * A start/skip/end item consists of n start patterns, one skip pattern and m
 * end patterns.
 * For the latter two, the patterns are always consecutive: start-skip-end.
 *
 * A character offset can be given for the matched text (_m_start and _m_end)
 * and for the actually highlighted text (_h_start and _h_end).
 */
typedef struct syn_pattern {
  char sp_type;                         /* see SPTYPE_ defines below */
  char sp_syncing;                      /* this item used for syncing */
  int sp_flags;                         /* see HL_ defines below */
  int sp_cchar;                         /* conceal substitute character */
  struct sp_syn sp_syn;                 /* struct passed to in_id_list() */
  short sp_syn_match_id;                /* highlight group ID of pattern */
  char_u      *sp_pattern;              /* regexp to match, pattern */
  regprog_T   *sp_prog;                 /* regexp to match, program */
  syn_time_T sp_time;
  int sp_ic;                            /* ignore-case flag for sp_prog */
  short sp_off_flags;                   /* see below */
  int sp_offsets[SPO_COUNT];            /* offsets */
  short       *sp_cont_list;            /* cont. group IDs, if non-zero */
  short       *sp_next_list;            /* next group IDs, if non-zero */
  int sp_sync_idx;                      /* sync item index (syncing only) */
  int sp_line_id;                       /* ID of last line where tried */
  int sp_startcol;                      /* next match in sp_line_id line */
} synpat_T;


typedef struct syn_cluster_S {
  char_u          *scl_name;        /* syntax cluster name */
  char_u          *scl_name_u;      /* uppercase of scl_name */
  short           *scl_list;        /* IDs in this syntax cluster */
} syn_cluster_T;

/*
 * For the current state we need to remember more than just the idx.
 * When si_m_endpos.lnum is 0, the items other than si_idx are unknown.
 * (The end positions have the column number of the next char)
 */
typedef struct state_item {
  int si_idx;                           /* index of syntax pattern or
                                           KEYWORD_IDX */
  int si_id;                            /* highlight group ID for keywords */
  int si_trans_id;                      /* idem, transparency removed */
  int si_m_lnum;                        /* lnum of the match */
  int si_m_startcol;                    /* starting column of the match */
  lpos_T si_m_endpos;                   /* just after end posn of the match */
  lpos_T si_h_startpos;                 /* start position of the highlighting */
  lpos_T si_h_endpos;                   /* end position of the highlighting */
  lpos_T si_eoe_pos;                    /* end position of end pattern */
  int si_end_idx;                       /* group ID for end pattern or zero */
  int si_ends;                          /* if match ends before si_m_endpos */
  int si_attr;                          /* attributes in this state */
  long si_flags;                        /* HL_HAS_EOL flag in this state, and
                                         * HL_SKIP* for si_next_list */
  int si_seqnr;                         /* sequence number */
  int si_cchar;                         /* substitution character for conceal */
  short       *si_cont_list;            /* list of contained groups */
  short       *si_next_list;            /* nextgroup IDs after this item ends */
  reg_extmatch_T *si_extmatch;          /* \z(...\) matches from start
                                         * pattern */
} stateitem_T;

/*
 * Struct to reduce the number of arguments to get_syn_options(), it's used
 * very often.
 */
typedef struct {
  int flags;                    /* flags for contained and transparent */
  int keyword;                  /* TRUE for ":syn keyword" */
  int         *sync_idx;        /* syntax item for "grouphere" argument, NULL
                                   if not allowed */
  char has_cont_list;           /* TRUE if "cont_list" can be used */
  short       *cont_list;       /* group IDs for "contains" argument */
  short       *cont_in_list;    /* group IDs for "containedin" argument */
  short       *next_list;       /* group IDs for "nextgroup" argument */
} syn_opt_arg_T;

typedef struct {
  proftime_T total;
  int count;
  int match;
  proftime_T slowest;
  proftime_T average;
  int id;
  char_u      *pattern;
} time_entry_T;

struct name_list {
  int flag;
  char        *name;
};

#ifdef INCLUDE_GENERATED_DECLARATIONS
# include "syntax.c.generated.h"
#endif

/*
 * An attribute number is the index in attr_table plus ATTR_OFF.
 */
#define ATTR_OFF 1


static char *(spo_name_tab[SPO_COUNT]) =
{"ms=", "me=", "hs=", "he=", "rs=", "re=", "lc="};

/* The sp_off_flags are computed like this:
 * offset from the start of the matched text: (1 << SPO_XX_OFF)
 * offset from the end	 of the matched text: (1 << (SPO_XX_OFF + SPO_COUNT))
 * When both are present, only one is used.
 */

#define SPTYPE_MATCH    1       /* match keyword with this group ID */
#define SPTYPE_START    2       /* match a regexp, start of item */
#define SPTYPE_END      3       /* match a regexp, end of item */
#define SPTYPE_SKIP     4       /* match a regexp, skip within item */


#define SYN_ITEMS(buf)  ((synpat_T *)((buf)->b_syn_patterns.ga_data))

#define NONE_IDX        -2      /* value of sp_sync_idx for "NONE" */

/*
 * Flags for b_syn_sync_flags:
 */
#define SF_CCOMMENT     0x01    /* sync on a C-style comment */
#define SF_MATCH        0x02    /* sync by matching a pattern */

#define SYN_STATE_P(ssp)    ((bufstate_T *)((ssp)->ga_data))

#define MAXKEYWLEN      80          /* maximum length of a keyword */

/*
 * The attributes of the syntax item that has been recognized.
 */
static int current_attr = 0;        /* attr of current syntax word */
static int current_id = 0;          /* ID of current char for syn_get_id() */
static int current_trans_id = 0;    /* idem, transparency removed */
static int current_flags = 0;
static int current_seqnr = 0;
static int current_sub_char = 0;

/*
 * Methods of combining two clusters
 */
#define CLUSTER_REPLACE     1   /* replace first list with second */
#define CLUSTER_ADD         2   /* add second list to first */
#define CLUSTER_SUBTRACT    3   /* subtract second list from first */

#define SYN_CLSTR(buf)  ((syn_cluster_T *)((buf)->b_syn_clusters.ga_data))

/*
 * Syntax group IDs have different types:
 *     0 - 19999  normal syntax groups
 * 20000 - 20999  ALLBUT indicator (current_syn_inc_tag added)
 * 21000 - 21999  TOP indicator (current_syn_inc_tag added)
 * 22000 - 22999  CONTAINED indicator (current_syn_inc_tag added)
 * 23000 - 32767  cluster IDs (subtract SYNID_CLUSTER for the cluster ID)
 */
#define SYNID_ALLBUT    MAX_HL_ID   /* syntax group ID for contains=ALLBUT */
#define SYNID_TOP       21000       /* syntax group ID for contains=TOP */
#define SYNID_CONTAINED 22000       /* syntax group ID for contains=CONTAINED */
#define SYNID_CLUSTER   23000       /* first syntax group ID for clusters */

#define MAX_SYN_INC_TAG 999         /* maximum before the above overflow */
#define MAX_CLUSTER_ID  (32767 - SYNID_CLUSTER)

/*
 * Annoying Hack(TM):  ":syn include" needs this pointer to pass to
 * expand_filename().  Most of the other syntax commands don't need it, so
 * instead of passing it to them, we stow it here.
 */
static char_u **syn_cmdlinep;

/*
 * Another Annoying Hack(TM):  To prevent rules from other ":syn include"'d
 * files from leaking into ALLBUT lists, we assign a unique ID to the
 * rules in each ":syn include"'d file.
 */
static int current_syn_inc_tag = 0;
static int running_syn_inc_tag = 0;

/*
 * In a hashtable item "hi_key" points to "keyword" in a keyentry.
 * This avoids adding a pointer to the hashtable item.
 * KE2HIKEY() converts a var pointer to a hashitem key pointer.
 * HIKEY2KE() converts a hashitem key pointer to a var pointer.
 * HI2KE() converts a hashitem pointer to a var pointer.
 */
static keyentry_T dumkey;
#define KE2HIKEY(kp)  ((kp)->keyword)
#define HIKEY2KE(p)   ((keyentry_T *)((p) - (dumkey.keyword - (char_u *)&dumkey)))
#define HI2KE(hi)      HIKEY2KE((hi)->hi_key)

/*
 * To reduce the time spent in keepend(), remember at which level in the state
 * stack the first item with "keepend" is present.  When "-1", there is no
 * "keepend" on the stack.
 */
static int keepend_level = -1;

static char msg_no_items[] = N_("No Syntax items defined for this buffer");

#define KEYWORD_IDX     -1          /* value of si_idx for keywords */
#define ID_LIST_ALL     (short *)-1 /* valid of si_cont_list for containing all
                                       but contained groups */

static int next_seqnr = 1;              /* value to use for si_seqnr */

/*
 * The next possible match in the current line for any pattern is remembered,
 * to avoid having to try for a match in each column.
 * If next_match_idx == -1, not tried (in this line) yet.
 * If next_match_col == MAXCOL, no match found in this line.
 * (All end positions have the column of the char after the end)
 */
static int next_match_col;              /* column for start of next match */
static lpos_T next_match_m_endpos;      /* position for end of next match */
static lpos_T next_match_h_startpos;  /* pos. for highl. start of next match */
static lpos_T next_match_h_endpos;      /* pos. for highl. end of next match */
static int next_match_idx;              /* index of matched item */
static long next_match_flags;           /* flags for next match */
static lpos_T next_match_eos_pos;       /* end of start pattn (start region) */
static lpos_T next_match_eoe_pos;       /* pos. for end of end pattern */
static int next_match_end_idx;          /* ID of group for end pattn or zero */
static reg_extmatch_T *next_match_extmatch = NULL;

/*
 * A state stack is an array of integers or stateitem_T, stored in a
 * garray_T.  A state stack is invalid if it's itemsize entry is zero.
 */
#define INVALID_STATE(ssp)  ((ssp)->ga_itemsize == 0)
#define VALID_STATE(ssp)    ((ssp)->ga_itemsize != 0)

/*
 * The current state (within the line) of the recognition engine.
 * When current_state.ga_itemsize is 0 the current state is invalid.
 */
static win_T    *syn_win;               /* current window for highlighting */
static buf_T    *syn_buf;               /* current buffer for highlighting */
static synblock_T *syn_block;           /* current buffer for highlighting */
static linenr_T current_lnum = 0;       /* lnum of current state */
static colnr_T current_col = 0;         /* column of current state */
static int current_state_stored = 0;      /* TRUE if stored current state
                                           * after setting current_finished */
static int current_finished = 0;        /* current line has been finished */
static garray_T current_state           /* current stack of state_items */
  = GA_EMPTY_INIT_VALUE;
static short    *current_next_list = NULL; /* when non-zero, nextgroup list */
static int current_next_flags = 0;      /* flags for current_next_list */
static int current_line_id = 0;         /* unique number for current line */

#define CUR_STATE(idx)  ((stateitem_T *)(current_state.ga_data))[idx]

static int syn_time_on = FALSE;
# define IF_SYN_TIME(p) (p)



/*
 * Start the syntax recognition for a line.  This function is normally called
 * from the screen updating, once for each displayed line.
 * The buffer is remembered in syn_buf, because get_syntax_attr() doesn't get
 * it.	Careful: curbuf and curwin are likely to point to another buffer and
 * window.
 */
void syntax_start(win_T *wp, linenr_T lnum)
{
  synstate_T  *p;
  synstate_T  *last_valid = NULL;
  synstate_T  *last_min_valid = NULL;
  synstate_T  *sp, *prev = NULL;
  linenr_T parsed_lnum;
  linenr_T first_stored;
  int dist;
  static int changedtick = 0;           /* remember the last change ID */

  current_sub_char = NUL;

  /*
   * After switching buffers, invalidate current_state.
   * Also do this when a change was made, the current state may be invalid
   * then.
   */
  if (syn_block != wp->w_s
      || syn_buf != wp->w_buffer
      || changedtick != syn_buf->b_changedtick) {
    invalidate_current_state();
    syn_buf = wp->w_buffer;
    syn_block = wp->w_s;
  }
  changedtick = syn_buf->b_changedtick;
  syn_win = wp;

  /*
   * Allocate syntax stack when needed.
   */
  syn_stack_alloc();
  if (syn_block->b_sst_array == NULL)
    return;             /* out of memory */
  syn_block->b_sst_lasttick = display_tick;

  /*
   * If the state of the end of the previous line is useful, store it.
   */
  if (VALID_STATE(&current_state)
      && current_lnum < lnum
      && current_lnum < syn_buf->b_ml.ml_line_count) {
    (void)syn_finish_line(FALSE);
    if (!current_state_stored) {
      ++current_lnum;
      (void)store_current_state();
    }

    /*
     * If the current_lnum is now the same as "lnum", keep the current
     * state (this happens very often!).  Otherwise invalidate
     * current_state and figure it out below.
     */
    if (current_lnum != lnum)
      invalidate_current_state();
  } else
    invalidate_current_state();

  /*
   * Try to synchronize from a saved state in b_sst_array[].
   * Only do this if lnum is not before and not to far beyond a saved state.
   */
  if (INVALID_STATE(&current_state) && syn_block->b_sst_array != NULL) {
    /* Find last valid saved state before start_lnum. */
    for (p = syn_block->b_sst_first; p != NULL; p = p->sst_next) {
      if (p->sst_lnum > lnum)
        break;
      if (p->sst_lnum <= lnum && p->sst_change_lnum == 0) {
        last_valid = p;
        if (p->sst_lnum >= lnum - syn_block->b_syn_sync_minlines)
          last_min_valid = p;
      }
    }
    if (last_min_valid != NULL)
      load_current_state(last_min_valid);
  }

  /*
   * If "lnum" is before or far beyond a line with a saved state, need to
   * re-synchronize.
   */
  if (INVALID_STATE(&current_state)) {
    syn_sync(wp, lnum, last_valid);
    if (current_lnum == 1)
      /* First line is always valid, no matter "minlines". */
      first_stored = 1;
    else
      /* Need to parse "minlines" lines before state can be considered
       * valid to store. */
      first_stored = current_lnum + syn_block->b_syn_sync_minlines;
  } else
    first_stored = current_lnum;

  /*
   * Advance from the sync point or saved state until the current line.
   * Save some entries for syncing with later on.
   */
  if (syn_block->b_sst_len <= Rows)
    dist = 999999;
  else
    dist = syn_buf->b_ml.ml_line_count / (syn_block->b_sst_len - Rows) + 1;
  while (current_lnum < lnum) {
    syn_start_line();
    (void)syn_finish_line(FALSE);
    ++current_lnum;

    /* If we parsed at least "minlines" lines or started at a valid
     * state, the current state is considered valid. */
    if (current_lnum >= first_stored) {
      /* Check if the saved state entry is for the current line and is
       * equal to the current state.  If so, then validate all saved
       * states that depended on a change before the parsed line. */
      if (prev == NULL)
        prev = syn_stack_find_entry(current_lnum - 1);
      if (prev == NULL)
        sp = syn_block->b_sst_first;
      else
        sp = prev;
      while (sp != NULL && sp->sst_lnum < current_lnum)
        sp = sp->sst_next;
      if (sp != NULL
          && sp->sst_lnum == current_lnum
          && syn_stack_equal(sp)) {
        parsed_lnum = current_lnum;
        prev = sp;
        while (sp != NULL && sp->sst_change_lnum <= parsed_lnum) {
          if (sp->sst_lnum <= lnum)
            /* valid state before desired line, use this one */
            prev = sp;
          else if (sp->sst_change_lnum == 0)
            /* past saved states depending on change, break here. */
            break;
          sp->sst_change_lnum = 0;
          sp = sp->sst_next;
        }
        load_current_state(prev);
      }
      /* Store the state at this line when it's the first one, the line
       * where we start parsing, or some distance from the previously
       * saved state.  But only when parsed at least 'minlines'. */
      else if (prev == NULL
               || current_lnum == lnum
               || current_lnum >= prev->sst_lnum + dist)
        prev = store_current_state();
    }

    /* This can take a long time: break when CTRL-C pressed.  The current
     * state will be wrong then. */
    line_breakcheck();
    if (got_int) {
      current_lnum = lnum;
      break;
    }
  }

  syn_start_line();
}

/*
 * We cannot simply discard growarrays full of state_items or buf_states; we
 * have to manually release their extmatch pointers first.
 */
static void clear_syn_state(synstate_T *p)
{
  if (p->sst_stacksize > SST_FIX_STATES) {
#   define UNREF_BUFSTATE_EXTMATCH(bs) unref_extmatch((bs)->bs_extmatch)
    GA_DEEP_CLEAR(&(p->sst_union.sst_ga), bufstate_T, UNREF_BUFSTATE_EXTMATCH);
  } else {
    for (int i = 0; i < p->sst_stacksize; i++) {
      unref_extmatch(p->sst_union.sst_stack[i].bs_extmatch);
    }
  }
}

/*
 * Cleanup the current_state stack.
 */
static void clear_current_state(void)
{
# define UNREF_STATEITEM_EXTMATCH(si) unref_extmatch((si)->si_extmatch)
  GA_DEEP_CLEAR(&current_state, stateitem_T, UNREF_STATEITEM_EXTMATCH);
}

/*
 * Try to find a synchronisation point for line "lnum".
 *
 * This sets current_lnum and the current state.  One of three methods is
 * used:
 * 1. Search backwards for the end of a C-comment.
 * 2. Search backwards for given sync patterns.
 * 3. Simply start on a given number of lines above "lnum".
 */
static void syn_sync(win_T *wp, linenr_T start_lnum, synstate_T *last_valid)
{
  buf_T       *curbuf_save;
  win_T       *curwin_save;
  pos_T cursor_save;
  int idx;
  linenr_T lnum;
  linenr_T end_lnum;
  linenr_T break_lnum;
  int had_sync_point;
  stateitem_T *cur_si;
  synpat_T    *spp;
  char_u      *line;
  int found_flags = 0;
  int found_match_idx = 0;
  linenr_T found_current_lnum = 0;
  int found_current_col= 0;
  lpos_T found_m_endpos;
  colnr_T prev_current_col;

  /*
   * Clear any current state that might be hanging around.
   */
  invalidate_current_state();

  /*
   * Start at least "minlines" back.  Default starting point for parsing is
   * there.
   * Start further back, to avoid that scrolling backwards will result in
   * resyncing for every line.  Now it resyncs only one out of N lines,
   * where N is minlines * 1.5, or minlines * 2 if minlines is small.
   * Watch out for overflow when minlines is MAXLNUM.
   */
  if (syn_block->b_syn_sync_minlines > start_lnum)
    start_lnum = 1;
  else {
    if (syn_block->b_syn_sync_minlines == 1)
      lnum = 1;
    else if (syn_block->b_syn_sync_minlines < 10)
      lnum = syn_block->b_syn_sync_minlines * 2;
    else
      lnum = syn_block->b_syn_sync_minlines * 3 / 2;
    if (syn_block->b_syn_sync_maxlines != 0
        && lnum > syn_block->b_syn_sync_maxlines)
      lnum = syn_block->b_syn_sync_maxlines;
    if (lnum >= start_lnum)
      start_lnum = 1;
    else
      start_lnum -= lnum;
  }
  current_lnum = start_lnum;

  /*
   * 1. Search backwards for the end of a C-style comment.
   */
  if (syn_block->b_syn_sync_flags & SF_CCOMMENT) {
    /* Need to make syn_buf the current buffer for a moment, to be able to
     * use find_start_comment(). */
    curwin_save = curwin;
    curwin = wp;
    curbuf_save = curbuf;
    curbuf = syn_buf;

    /*
     * Skip lines that end in a backslash.
     */
    for (; start_lnum > 1; --start_lnum) {
      line = ml_get(start_lnum - 1);
      if (*line == NUL || *(line + STRLEN(line) - 1) != '\\')
        break;
    }
    current_lnum = start_lnum;

    /* set cursor to start of search */
    cursor_save = wp->w_cursor;
    wp->w_cursor.lnum = start_lnum;
    wp->w_cursor.col = 0;

    /*
     * If the line is inside a comment, need to find the syntax item that
     * defines the comment.
     * Restrict the search for the end of a comment to b_syn_sync_maxlines.
     */
    if (find_start_comment((int)syn_block->b_syn_sync_maxlines) != NULL) {
      for (idx = syn_block->b_syn_patterns.ga_len; --idx >= 0; )
        if (SYN_ITEMS(syn_block)[idx].sp_syn.id
            == syn_block->b_syn_sync_id
            && SYN_ITEMS(syn_block)[idx].sp_type == SPTYPE_START) {
          validate_current_state();
          push_current_state(idx);
          update_si_attr(current_state.ga_len - 1);
          break;
        }
    }

    /* restore cursor and buffer */
    wp->w_cursor = cursor_save;
    curwin = curwin_save;
    curbuf = curbuf_save;
  }
  /*
   * 2. Search backwards for given sync patterns.
   */
  else if (syn_block->b_syn_sync_flags & SF_MATCH) {
    if (syn_block->b_syn_sync_maxlines != 0
        && start_lnum > syn_block->b_syn_sync_maxlines)
      break_lnum = start_lnum - syn_block->b_syn_sync_maxlines;
    else
      break_lnum = 0;

    found_m_endpos.lnum = 0;
    found_m_endpos.col = 0;
    end_lnum = start_lnum;
    lnum = start_lnum;
    while (--lnum > break_lnum) {
      /* This can take a long time: break when CTRL-C pressed. */
      line_breakcheck();
      if (got_int) {
        invalidate_current_state();
        current_lnum = start_lnum;
        break;
      }

      /* Check if we have run into a valid saved state stack now. */
      if (last_valid != NULL && lnum == last_valid->sst_lnum) {
        load_current_state(last_valid);
        break;
      }

      /*
       * Check if the previous line has the line-continuation pattern.
       */
      if (lnum > 1 && syn_match_linecont(lnum - 1))
        continue;

      /*
       * Start with nothing on the state stack
       */
      validate_current_state();

      for (current_lnum = lnum; current_lnum < end_lnum; ++current_lnum) {
        syn_start_line();
        for (;; ) {
          had_sync_point = syn_finish_line(TRUE);
          /*
           * When a sync point has been found, remember where, and
           * continue to look for another one, further on in the line.
           */
          if (had_sync_point && current_state.ga_len) {
            cur_si = &CUR_STATE(current_state.ga_len - 1);
            if (cur_si->si_m_endpos.lnum > start_lnum) {
              /* ignore match that goes to after where started */
              current_lnum = end_lnum;
              break;
            }
            if (cur_si->si_idx < 0) {
              /* Cannot happen? */
              found_flags = 0;
              found_match_idx = KEYWORD_IDX;
            } else {
              spp = &(SYN_ITEMS(syn_block)[cur_si->si_idx]);
              found_flags = spp->sp_flags;
              found_match_idx = spp->sp_sync_idx;
            }
            found_current_lnum = current_lnum;
            found_current_col = current_col;
            found_m_endpos = cur_si->si_m_endpos;
            /*
             * Continue after the match (be aware of a zero-length
             * match).
             */
            if (found_m_endpos.lnum > current_lnum) {
              current_lnum = found_m_endpos.lnum;
              current_col = found_m_endpos.col;
              if (current_lnum >= end_lnum)
                break;
            } else if (found_m_endpos.col > current_col)
              current_col = found_m_endpos.col;
            else
              ++current_col;

            /* syn_current_attr() will have skipped the check for
             * an item that ends here, need to do that now.  Be
             * careful not to go past the NUL. */
            prev_current_col = current_col;
            if (syn_getcurline()[current_col] != NUL)
              ++current_col;
            check_state_ends();
            current_col = prev_current_col;
          } else
            break;
        }
      }

      /*
       * If a sync point was encountered, break here.
       */
      if (found_flags) {
        /*
         * Put the item that was specified by the sync point on the
         * state stack.  If there was no item specified, make the
         * state stack empty.
         */
        clear_current_state();
        if (found_match_idx >= 0) {
          push_current_state(found_match_idx);
          update_si_attr(current_state.ga_len - 1);
        }

        /*
         * When using "grouphere", continue from the sync point
         * match, until the end of the line.  Parsing starts at
         * the next line.
         * For "groupthere" the parsing starts at start_lnum.
         */
        if (found_flags & HL_SYNC_HERE) {
          if (!GA_EMPTY(&current_state)) {
            cur_si = &CUR_STATE(current_state.ga_len - 1);
            cur_si->si_h_startpos.lnum = found_current_lnum;
            cur_si->si_h_startpos.col = found_current_col;
            update_si_end(cur_si, (int)current_col, TRUE);
            check_keepend();
          }
          current_col = found_m_endpos.col;
          current_lnum = found_m_endpos.lnum;
          (void)syn_finish_line(FALSE);
          ++current_lnum;
        } else
          current_lnum = start_lnum;

        break;
      }

      end_lnum = lnum;
      invalidate_current_state();
    }

    /* Ran into start of the file or exceeded maximum number of lines */
    if (lnum <= break_lnum) {
      invalidate_current_state();
      current_lnum = break_lnum + 1;
    }
  }

  validate_current_state();
}

static void save_chartab(char_u *chartab)
{
  if (syn_block->b_syn_isk != empty_option) {
    memmove(chartab, syn_buf->b_chartab, (size_t)32);
    memmove(syn_buf->b_chartab, syn_win->w_s->b_syn_chartab, (size_t)32);
  }
}

static void restore_chartab(char_u *chartab)
{
  if (syn_win->w_s->b_syn_isk != empty_option) {
    memmove(syn_buf->b_chartab, chartab, (size_t)32);
  }
}

/*
 * Return TRUE if the line-continuation pattern matches in line "lnum".
 */
static int syn_match_linecont(linenr_T lnum)
{
  if (syn_block->b_syn_linecont_prog != NULL) {
    regmmatch_T regmatch;
    // chartab array for syn iskeyword
    char_u buf_chartab[32];
    save_chartab(buf_chartab);

    regmatch.rmm_ic = syn_block->b_syn_linecont_ic;
    regmatch.regprog = syn_block->b_syn_linecont_prog;
    int r = syn_regexec(&regmatch, lnum, (colnr_T)0,
                        IF_SYN_TIME(&syn_block->b_syn_linecont_time));
    syn_block->b_syn_linecont_prog = regmatch.regprog;

    restore_chartab(buf_chartab);
    return r;
  }
  return FALSE;
}

/*
 * Prepare the current state for the start of a line.
 */
static void syn_start_line(void)
{
  current_finished = FALSE;
  current_col = 0;

  /*
   * Need to update the end of a start/skip/end that continues from the
   * previous line and regions that have "keepend".
   */
  if (!GA_EMPTY(&current_state)) {
    syn_update_ends(TRUE);
    check_state_ends();
  }

  next_match_idx = -1;
  ++current_line_id;
}

/*
 * Check for items in the stack that need their end updated.
 * When "startofline" is TRUE the last item is always updated.
 * When "startofline" is FALSE the item with "keepend" is forcefully updated.
 */
static void syn_update_ends(int startofline)
{
  stateitem_T *cur_si;
  int seen_keepend;

  if (startofline) {
    /* Check for a match carried over from a previous line with a
     * contained region.  The match ends as soon as the region ends. */
    for (int i = 0; i < current_state.ga_len; ++i) {
      cur_si = &CUR_STATE(i);
      if (cur_si->si_idx >= 0
          && (SYN_ITEMS(syn_block)[cur_si->si_idx]).sp_type
          == SPTYPE_MATCH
          && cur_si->si_m_endpos.lnum < current_lnum) {
        cur_si->si_flags |= HL_MATCHCONT;
        cur_si->si_m_endpos.lnum = 0;
        cur_si->si_m_endpos.col = 0;
        cur_si->si_h_endpos = cur_si->si_m_endpos;
        cur_si->si_ends = TRUE;
      }
    }
  }

  /*
   * Need to update the end of a start/skip/end that continues from the
   * previous line.  And regions that have "keepend", because they may
   * influence contained items.  If we've just removed "extend"
   * (startofline == 0) then we should update ends of normal regions
   * contained inside "keepend" because "extend" could have extended
   * these "keepend" regions as well as contained normal regions.
   * Then check for items ending in column 0.
   */
  int i = current_state.ga_len - 1;
  if (keepend_level >= 0)
    for (; i > keepend_level; --i)
      if (CUR_STATE(i).si_flags & HL_EXTEND)
        break;

  seen_keepend = FALSE;
  for (; i < current_state.ga_len; ++i) {
    cur_si = &CUR_STATE(i);
    if ((cur_si->si_flags & HL_KEEPEND)
        || (seen_keepend && !startofline)
        || (i == current_state.ga_len - 1 && startofline)) {
      cur_si->si_h_startpos.col = 0;            /* start highl. in col 0 */
      cur_si->si_h_startpos.lnum = current_lnum;

      if (!(cur_si->si_flags & HL_MATCHCONT))
        update_si_end(cur_si, (int)current_col, !startofline);

      if (!startofline && (cur_si->si_flags & HL_KEEPEND))
        seen_keepend = TRUE;
    }
  }
  check_keepend();
}

/****************************************
 * Handling of the state stack cache.
 */

/*
 * EXPLANATION OF THE SYNTAX STATE STACK CACHE
 *
 * To speed up syntax highlighting, the state stack for the start of some
 * lines is cached.  These entries can be used to start parsing at that point.
 *
 * The stack is kept in b_sst_array[] for each buffer.  There is a list of
 * valid entries.  b_sst_first points to the first one, then follow sst_next.
 * The entries are sorted on line number.  The first entry is often for line 2
 * (line 1 always starts with an empty stack).
 * There is also a list for free entries.  This construction is used to avoid
 * having to allocate and free memory blocks too often.
 *
 * When making changes to the buffer, this is logged in b_mod_*.  When calling
 * update_screen() to update the display, it will call
 * syn_stack_apply_changes() for each displayed buffer to adjust the cached
 * entries.  The entries which are inside the changed area are removed,
 * because they must be recomputed.  Entries below the changed have their line
 * number adjusted for deleted/inserted lines, and have their sst_change_lnum
 * set to indicate that a check must be made if the changed lines would change
 * the cached entry.
 *
 * When later displaying lines, an entry is stored for each line.  Displayed
 * lines are likely to be displayed again, in which case the state at the
 * start of the line is needed.
 * For not displayed lines, an entry is stored for every so many lines.  These
 * entries will be used e.g., when scrolling backwards.  The distance between
 * entries depends on the number of lines in the buffer.  For small buffers
 * the distance is fixed at SST_DIST, for large buffers there is a fixed
 * number of entries SST_MAX_ENTRIES, and the distance is computed.
 */

static void syn_stack_free_block(synblock_T *block)
{
  synstate_T  *p;

  if (block->b_sst_array != NULL) {
    for (p = block->b_sst_first; p != NULL; p = p->sst_next)
      clear_syn_state(p);
    xfree(block->b_sst_array);
    block->b_sst_array = NULL;
    block->b_sst_len = 0;
  }
}
/*
 * Free b_sst_array[] for buffer "buf".
 * Used when syntax items changed to force resyncing everywhere.
 */
void syn_stack_free_all(synblock_T *block)
{
  syn_stack_free_block(block);

  /* When using "syntax" fold method, must update all folds. */
  FOR_ALL_WINDOWS_IN_TAB(wp, curtab) {
    if (wp->w_s == block && foldmethodIsSyntax(wp)) {
      foldUpdateAll(wp);
    }
  }
}

/*
 * Allocate the syntax state stack for syn_buf when needed.
 * If the number of entries in b_sst_array[] is much too big or a bit too
 * small, reallocate it.
 * Also used to allocate b_sst_array[] for the first time.
 */
static void syn_stack_alloc(void)
{
  long len;
  synstate_T  *to, *from;
  synstate_T  *sstp;

  len = syn_buf->b_ml.ml_line_count / SST_DIST + Rows * 2;
  if (len < SST_MIN_ENTRIES)
    len = SST_MIN_ENTRIES;
  else if (len > SST_MAX_ENTRIES)
    len = SST_MAX_ENTRIES;
  if (syn_block->b_sst_len > len * 2 || syn_block->b_sst_len < len) {
    /* Allocate 50% too much, to avoid reallocating too often. */
    len = syn_buf->b_ml.ml_line_count;
    len = (len + len / 2) / SST_DIST + Rows * 2;
    if (len < SST_MIN_ENTRIES)
      len = SST_MIN_ENTRIES;
    else if (len > SST_MAX_ENTRIES)
      len = SST_MAX_ENTRIES;

    if (syn_block->b_sst_array != NULL) {
      /* When shrinking the array, cleanup the existing stack.
       * Make sure that all valid entries fit in the new array. */
      while (syn_block->b_sst_len - syn_block->b_sst_freecount + 2 > len
             && syn_stack_cleanup())
        ;
      if (len < syn_block->b_sst_len - syn_block->b_sst_freecount + 2)
        len = syn_block->b_sst_len - syn_block->b_sst_freecount + 2;
    }

    assert(len >= 0);
    sstp = xcalloc(len, sizeof(synstate_T));

    to = sstp - 1;
    if (syn_block->b_sst_array != NULL) {
      /* Move the states from the old array to the new one. */
      for (from = syn_block->b_sst_first; from != NULL;
           from = from->sst_next) {
        ++to;
        *to = *from;
        to->sst_next = to + 1;
      }
    }
    if (to != sstp - 1) {
      to->sst_next = NULL;
      syn_block->b_sst_first = sstp;
      syn_block->b_sst_freecount = len - (int)(to - sstp) - 1;
    } else {
      syn_block->b_sst_first = NULL;
      syn_block->b_sst_freecount = len;
    }

    /* Create the list of free entries. */
    syn_block->b_sst_firstfree = to + 1;
    while (++to < sstp + len)
      to->sst_next = to + 1;
    (sstp + len - 1)->sst_next = NULL;

    xfree(syn_block->b_sst_array);
    syn_block->b_sst_array = sstp;
    syn_block->b_sst_len = len;
  }
}

/*
 * Check for changes in a buffer to affect stored syntax states.  Uses the
 * b_mod_* fields.
 * Called from update_screen(), before screen is being updated, once for each
 * displayed buffer.
 */
void syn_stack_apply_changes(buf_T *buf)
{
  syn_stack_apply_changes_block(&buf->b_s, buf);

  FOR_ALL_WINDOWS_IN_TAB(wp, curtab) {
    if ((wp->w_buffer == buf) && (wp->w_s != &buf->b_s)) {
      syn_stack_apply_changes_block(wp->w_s, buf);
    }
  }
}

static void syn_stack_apply_changes_block(synblock_T *block, buf_T *buf)
{
  synstate_T  *p, *prev, *np;
  linenr_T n;

  if (block->b_sst_array == NULL)       /* nothing to do */
    return;

  prev = NULL;
  for (p = block->b_sst_first; p != NULL; ) {
    if (p->sst_lnum + block->b_syn_sync_linebreaks > buf->b_mod_top) {
      n = p->sst_lnum + buf->b_mod_xlines;
      if (n <= buf->b_mod_bot) {
        /* this state is inside the changed area, remove it */
        np = p->sst_next;
        if (prev == NULL)
          block->b_sst_first = np;
        else
          prev->sst_next = np;
        syn_stack_free_entry(block, p);
        p = np;
        continue;
      }
      /* This state is below the changed area.  Remember the line
       * that needs to be parsed before this entry can be made valid
       * again. */
      if (p->sst_change_lnum != 0 && p->sst_change_lnum > buf->b_mod_top) {
        if (p->sst_change_lnum + buf->b_mod_xlines > buf->b_mod_top)
          p->sst_change_lnum += buf->b_mod_xlines;
        else
          p->sst_change_lnum = buf->b_mod_top;
      }
      if (p->sst_change_lnum == 0
          || p->sst_change_lnum < buf->b_mod_bot)
        p->sst_change_lnum = buf->b_mod_bot;

      p->sst_lnum = n;
    }
    prev = p;
    p = p->sst_next;
  }
}

/*
 * Reduce the number of entries in the state stack for syn_buf.
 * Returns TRUE if at least one entry was freed.
 */
static int syn_stack_cleanup(void)
{
  synstate_T  *p, *prev;
  disptick_T tick;
  int above;
  int dist;
  int retval = FALSE;

  if (syn_block->b_sst_array == NULL || syn_block->b_sst_first == NULL)
    return retval;

  /* Compute normal distance between non-displayed entries. */
  if (syn_block->b_sst_len <= Rows)
    dist = 999999;
  else
    dist = syn_buf->b_ml.ml_line_count / (syn_block->b_sst_len - Rows) + 1;

  /*
   * Go through the list to find the "tick" for the oldest entry that can
   * be removed.  Set "above" when the "tick" for the oldest entry is above
   * "b_sst_lasttick" (the display tick wraps around).
   */
  tick = syn_block->b_sst_lasttick;
  above = FALSE;
  prev = syn_block->b_sst_first;
  for (p = prev->sst_next; p != NULL; prev = p, p = p->sst_next) {
    if (prev->sst_lnum + dist > p->sst_lnum) {
      if (p->sst_tick > syn_block->b_sst_lasttick) {
        if (!above || p->sst_tick < tick)
          tick = p->sst_tick;
        above = TRUE;
      } else if (!above && p->sst_tick < tick)
        tick = p->sst_tick;
    }
  }

  /*
   * Go through the list to make the entries for the oldest tick at an
   * interval of several lines.
   */
  prev = syn_block->b_sst_first;
  for (p = prev->sst_next; p != NULL; prev = p, p = p->sst_next) {
    if (p->sst_tick == tick && prev->sst_lnum + dist > p->sst_lnum) {
      /* Move this entry from used list to free list */
      prev->sst_next = p->sst_next;
      syn_stack_free_entry(syn_block, p);
      p = prev;
      retval = TRUE;
    }
  }
  return retval;
}

/*
 * Free the allocated memory for a syn_state item.
 * Move the entry into the free list.
 */
static void syn_stack_free_entry(synblock_T *block, synstate_T *p)
{
  clear_syn_state(p);
  p->sst_next = block->b_sst_firstfree;
  block->b_sst_firstfree = p;
  ++block->b_sst_freecount;
}

/*
 * Find an entry in the list of state stacks at or before "lnum".
 * Returns NULL when there is no entry or the first entry is after "lnum".
 */
static synstate_T *syn_stack_find_entry(linenr_T lnum)
{
  synstate_T  *p, *prev;

  prev = NULL;
  for (p = syn_block->b_sst_first; p != NULL; prev = p, p = p->sst_next) {
    if (p->sst_lnum == lnum)
      return p;
    if (p->sst_lnum > lnum)
      break;
  }
  return prev;
}

/*
 * Try saving the current state in b_sst_array[].
 * The current state must be valid for the start of the current_lnum line!
 */
static synstate_T *store_current_state(void)
{
  int i;
  synstate_T  *p;
  bufstate_T  *bp;
  stateitem_T *cur_si;
  synstate_T  *sp = syn_stack_find_entry(current_lnum);

  /*
   * If the current state contains a start or end pattern that continues
   * from the previous line, we can't use it.  Don't store it then.
   */
  for (i = current_state.ga_len - 1; i >= 0; --i) {
    cur_si = &CUR_STATE(i);
    if (cur_si->si_h_startpos.lnum >= current_lnum
        || cur_si->si_m_endpos.lnum >= current_lnum
        || cur_si->si_h_endpos.lnum >= current_lnum
        || (cur_si->si_end_idx
            && cur_si->si_eoe_pos.lnum >= current_lnum))
      break;
  }
  if (i >= 0) {
    if (sp != NULL) {
      /* find "sp" in the list and remove it */
      if (syn_block->b_sst_first == sp)
        /* it's the first entry */
        syn_block->b_sst_first = sp->sst_next;
      else {
        /* find the entry just before this one to adjust sst_next */
        for (p = syn_block->b_sst_first; p != NULL; p = p->sst_next)
          if (p->sst_next == sp)
            break;
        if (p != NULL)          /* just in case */
          p->sst_next = sp->sst_next;
      }
      syn_stack_free_entry(syn_block, sp);
      sp = NULL;
    }
  } else if (sp == NULL || sp->sst_lnum != current_lnum)   {
    /*
     * Add a new entry
     */
    /* If no free items, cleanup the array first. */
    if (syn_block->b_sst_freecount == 0) {
      (void)syn_stack_cleanup();
      /* "sp" may have been moved to the freelist now */
      sp = syn_stack_find_entry(current_lnum);
    }
    /* Still no free items?  Must be a strange problem... */
    if (syn_block->b_sst_freecount == 0)
      sp = NULL;
    else {
      /* Take the first item from the free list and put it in the used
       * list, after *sp */
      p = syn_block->b_sst_firstfree;
      syn_block->b_sst_firstfree = p->sst_next;
      --syn_block->b_sst_freecount;
      if (sp == NULL) {
        /* Insert in front of the list */
        p->sst_next = syn_block->b_sst_first;
        syn_block->b_sst_first = p;
      } else {
        /* insert in list after *sp */
        p->sst_next = sp->sst_next;
        sp->sst_next = p;
      }
      sp = p;
      sp->sst_stacksize = 0;
      sp->sst_lnum = current_lnum;
    }
  }
  if (sp != NULL) {
    /* When overwriting an existing state stack, clear it first */
    clear_syn_state(sp);
    sp->sst_stacksize = current_state.ga_len;
    if (current_state.ga_len > SST_FIX_STATES) {
      /* Need to clear it, might be something remaining from when the
       * length was less than SST_FIX_STATES. */
      ga_init(&sp->sst_union.sst_ga, (int)sizeof(bufstate_T), 1);
      ga_grow(&sp->sst_union.sst_ga, current_state.ga_len);
      sp->sst_union.sst_ga.ga_len = current_state.ga_len;
      bp = SYN_STATE_P(&(sp->sst_union.sst_ga));
    } else
      bp = sp->sst_union.sst_stack;
    for (i = 0; i < sp->sst_stacksize; ++i) {
      bp[i].bs_idx = CUR_STATE(i).si_idx;
      bp[i].bs_flags = CUR_STATE(i).si_flags;
      bp[i].bs_seqnr = CUR_STATE(i).si_seqnr;
      bp[i].bs_cchar = CUR_STATE(i).si_cchar;
      bp[i].bs_extmatch = ref_extmatch(CUR_STATE(i).si_extmatch);
    }
    sp->sst_next_flags = current_next_flags;
    sp->sst_next_list = current_next_list;
    sp->sst_tick = display_tick;
    sp->sst_change_lnum = 0;
  }
  current_state_stored = TRUE;
  return sp;
}

/*
 * Copy a state stack from "from" in b_sst_array[] to current_state;
 */
static void load_current_state(synstate_T *from)
{
  int i;
  bufstate_T  *bp;

  clear_current_state();
  validate_current_state();
  keepend_level = -1;
  if (from->sst_stacksize) {
    ga_grow(&current_state, from->sst_stacksize);
    if (from->sst_stacksize > SST_FIX_STATES)
      bp = SYN_STATE_P(&(from->sst_union.sst_ga));
    else
      bp = from->sst_union.sst_stack;
    for (i = 0; i < from->sst_stacksize; ++i) {
      CUR_STATE(i).si_idx = bp[i].bs_idx;
      CUR_STATE(i).si_flags = bp[i].bs_flags;
      CUR_STATE(i).si_seqnr = bp[i].bs_seqnr;
      CUR_STATE(i).si_cchar = bp[i].bs_cchar;
      CUR_STATE(i).si_extmatch = ref_extmatch(bp[i].bs_extmatch);
      if (keepend_level < 0 && (CUR_STATE(i).si_flags & HL_KEEPEND))
        keepend_level = i;
      CUR_STATE(i).si_ends = FALSE;
      CUR_STATE(i).si_m_lnum = 0;
      if (CUR_STATE(i).si_idx >= 0)
        CUR_STATE(i).si_next_list =
          (SYN_ITEMS(syn_block)[CUR_STATE(i).si_idx]).sp_next_list;
      else
        CUR_STATE(i).si_next_list = NULL;
      update_si_attr(i);
    }
    current_state.ga_len = from->sst_stacksize;
  }
  current_next_list = from->sst_next_list;
  current_next_flags = from->sst_next_flags;
  current_lnum = from->sst_lnum;
}

/*
 * Compare saved state stack "*sp" with the current state.
 * Return TRUE when they are equal.
 */
static int syn_stack_equal(synstate_T *sp)
{
  bufstate_T  *bp;
  reg_extmatch_T      *six, *bsx;

  /* First a quick check if the stacks have the same size end nextlist. */
  if (sp->sst_stacksize != current_state.ga_len
      || sp->sst_next_list != current_next_list) {
    return FALSE;
  }

  /* Need to compare all states on both stacks. */
  if (sp->sst_stacksize > SST_FIX_STATES)
    bp = SYN_STATE_P(&(sp->sst_union.sst_ga));
  else
    bp = sp->sst_union.sst_stack;

  int i;
  for (i = current_state.ga_len; --i >= 0; ) {
    /* If the item has another index the state is different. */
    if (bp[i].bs_idx != CUR_STATE(i).si_idx)
      break;
    if (bp[i].bs_extmatch == CUR_STATE(i).si_extmatch) {
      continue;
    }
    /* When the extmatch pointers are different, the strings in
     * them can still be the same.  Check if the extmatch
     * references are equal. */
    bsx = bp[i].bs_extmatch;
    six = CUR_STATE(i).si_extmatch;
    /* If one of the extmatch pointers is NULL the states are
     * different. */
    if (bsx == NULL || six == NULL)
      break;
    int j;
    for (j = 0; j < NSUBEXP; ++j) {
      /* Check each referenced match string. They must all be
       * equal. */
      if (bsx->matches[j] != six->matches[j]) {
        /* If the pointer is different it can still be the
         * same text.  Compare the strings, ignore case when
         * the start item has the sp_ic flag set. */
        if (bsx->matches[j] == NULL || six->matches[j] == NULL) {
          break;
        }
        if (mb_strcmp_ic((SYN_ITEMS(syn_block)[CUR_STATE(i).si_idx]).sp_ic,
                         (const char *)bsx->matches[j],
                         (const char *)six->matches[j]) != 0) {
          break;
        }
      }
    }
    if (j != NSUBEXP)
      break;
  }
  if (i < 0)
    return TRUE;

  return FALSE;
}

/*
 * We stop parsing syntax above line "lnum".  If the stored state at or below
 * this line depended on a change before it, it now depends on the line below
 * the last parsed line.
 * The window looks like this:
 *	    line which changed
 *	    displayed line
 *	    displayed line
 * lnum ->  line below window
 */
void syntax_end_parsing(linenr_T lnum)
{
  synstate_T  *sp;

  sp = syn_stack_find_entry(lnum);
  if (sp != NULL && sp->sst_lnum < lnum)
    sp = sp->sst_next;

  if (sp != NULL && sp->sst_change_lnum != 0)
    sp->sst_change_lnum = lnum;
}

/*
 * End of handling of the state stack.
 ****************************************/

static void invalidate_current_state(void)
{
  clear_current_state();
  current_state.ga_itemsize = 0;        /* mark current_state invalid */
  current_next_list = NULL;
  keepend_level = -1;
}

static void validate_current_state(void)
{
  current_state.ga_itemsize = sizeof(stateitem_T);
  ga_set_growsize(&current_state, 3);
}

/*
 * Return TRUE if the syntax at start of lnum changed since last time.
 * This will only be called just after get_syntax_attr() for the previous
 * line, to check if the next line needs to be redrawn too.
 */
int syntax_check_changed(linenr_T lnum)
{
  int retval = TRUE;
  synstate_T  *sp;

  /*
   * Check the state stack when:
   * - lnum is just below the previously syntaxed line.
   * - lnum is not before the lines with saved states.
   * - lnum is not past the lines with saved states.
   * - lnum is at or before the last changed line.
   */
  if (VALID_STATE(&current_state) && lnum == current_lnum + 1) {
    sp = syn_stack_find_entry(lnum);
    if (sp != NULL && sp->sst_lnum == lnum) {
      /*
       * finish the previous line (needed when not all of the line was
       * drawn)
       */
      (void)syn_finish_line(FALSE);

      /*
       * Compare the current state with the previously saved state of
       * the line.
       */
      if (syn_stack_equal(sp))
        retval = FALSE;

      /*
       * Store the current state in b_sst_array[] for later use.
       */
      ++current_lnum;
      (void)store_current_state();
    }
  }

  return retval;
}

/*
 * Finish the current line.
 * This doesn't return any attributes, it only gets the state at the end of
 * the line.  It can start anywhere in the line, as long as the current state
 * is valid.
 */
static int 
syn_finish_line (
    int syncing                    /* called for syncing */
)
{
  stateitem_T *cur_si;
  colnr_T prev_current_col;

  while (!current_finished) {
    (void)syn_current_attr(syncing, FALSE, NULL, FALSE);
    /*
     * When syncing, and found some item, need to check the item.
     */
    if (syncing && current_state.ga_len) {
      /*
       * Check for match with sync item.
       */
      cur_si = &CUR_STATE(current_state.ga_len - 1);
      if (cur_si->si_idx >= 0
          && (SYN_ITEMS(syn_block)[cur_si->si_idx].sp_flags
              & (HL_SYNC_HERE|HL_SYNC_THERE)))
        return TRUE;

      /* syn_current_attr() will have skipped the check for an item
       * that ends here, need to do that now.  Be careful not to go
       * past the NUL. */
      prev_current_col = current_col;
      if (syn_getcurline()[current_col] != NUL)
        ++current_col;
      check_state_ends();
      current_col = prev_current_col;
    }
    ++current_col;
  }
  return FALSE;
}

/*
 * Return highlight attributes for next character.
 * Must first call syntax_start() once for the line.
 * "col" is normally 0 for the first use in a line, and increments by one each
 * time.  It's allowed to skip characters and to stop before the end of the
 * line.  But only a "col" after a previously used column is allowed.
 * When "can_spell" is not NULL set it to TRUE when spell-checking should be
 * done.
 */
int 
get_syntax_attr (
    colnr_T col,
    bool *can_spell,
    int keep_state                 /* keep state of char at "col" */
)
{
  int attr = 0;

  if (can_spell != NULL)
    /* Default: Only do spelling when there is no @Spell cluster or when
     * ":syn spell toplevel" was used. */
    *can_spell = syn_block->b_syn_spell == SYNSPL_DEFAULT
                 ? (syn_block->b_spell_cluster_id == 0)
                 : (syn_block->b_syn_spell == SYNSPL_TOP);

  /* check for out of memory situation */
  if (syn_block->b_sst_array == NULL)
    return 0;

  /* After 'synmaxcol' the attribute is always zero. */
  if (syn_buf->b_p_smc > 0 && col >= (colnr_T)syn_buf->b_p_smc) {
    clear_current_state();
    current_id = 0;
    current_trans_id = 0;
    current_flags = 0;
    return 0;
  }

  /* Make sure current_state is valid */
  if (INVALID_STATE(&current_state))
    validate_current_state();

  /*
   * Skip from the current column to "col", get the attributes for "col".
   */
  while (current_col <= col) {
    attr = syn_current_attr(FALSE, TRUE, can_spell,
        current_col == col ? keep_state : FALSE);
    ++current_col;
  }

  return attr;
}

/*
 * Get syntax attributes for current_lnum, current_col.
 */
static int 
syn_current_attr (
    int syncing,                           /* When 1: called for syncing */
    int displaying,                        /* result will be displayed */
    bool *can_spell,                       /* return: do spell checking */
    int keep_state                         /* keep syntax stack afterwards */
)
{
  int syn_id;
  lpos_T endpos;                /* was: char_u *endp; */
  lpos_T hl_startpos;           /* was: int hl_startcol; */
  lpos_T hl_endpos;
  lpos_T eos_pos;               /* end-of-start match (start region) */
  lpos_T eoe_pos;               /* end-of-end pattern */
  int end_idx;                  /* group ID for end pattern */
  synpat_T    *spp;
  stateitem_T *cur_si, *sip = NULL;
  int startcol;
  int endcol;
  long flags;
  int cchar;
  short       *next_list;
  int found_match;                          /* found usable match */
  static int try_next_column = FALSE;       /* must try in next col */
  int do_keywords;
  regmmatch_T regmatch;
  lpos_T pos;
  int lc_col;
  reg_extmatch_T *cur_extmatch = NULL;
  char_u      buf_chartab[32];  // chartab array for syn iskeyword
  char_u      *line;            // current line.  NOTE: becomes invalid after
                                // looking for a pattern match!

  /* variables for zero-width matches that have a "nextgroup" argument */
  int keep_next_list;
  int zero_width_next_list = FALSE;
  garray_T zero_width_next_ga;

  /*
   * No character, no attributes!  Past end of line?
   * Do try matching with an empty line (could be the start of a region).
   */
  line = syn_getcurline();
  if (line[current_col] == NUL && current_col != 0) {
    /*
     * If we found a match after the last column, use it.
     */
    if (next_match_idx >= 0 && next_match_col >= (int)current_col
        && next_match_col != MAXCOL)
      (void)push_next_match(NULL);

    current_finished = TRUE;
    current_state_stored = FALSE;
    return 0;
  }

  /* if the current or next character is NUL, we will finish the line now */
  if (line[current_col] == NUL || line[current_col + 1] == NUL) {
    current_finished = TRUE;
    current_state_stored = FALSE;
  }

  /*
   * When in the previous column there was a match but it could not be used
   * (empty match or already matched in this column) need to try again in
   * the next column.
   */
  if (try_next_column) {
    next_match_idx = -1;
    try_next_column = FALSE;
  }

  /* Only check for keywords when not syncing and there are some. */
  do_keywords = !syncing
                && (syn_block->b_keywtab.ht_used > 0
                    || syn_block->b_keywtab_ic.ht_used > 0);

  /* Init the list of zero-width matches with a nextlist.  This is used to
   * avoid matching the same item in the same position twice. */
  ga_init(&zero_width_next_ga, (int)sizeof(int), 10);

  // use syntax iskeyword option
  save_chartab(buf_chartab);

  /*
   * Repeat matching keywords and patterns, to find contained items at the
   * same column.  This stops when there are no extra matches at the current
   * column.
   */
  do {
    found_match = FALSE;
    keep_next_list = FALSE;
    syn_id = 0;

    /*
     * 1. Check for a current state.
     *    Only when there is no current state, or if the current state may
     *    contain other things, we need to check for keywords and patterns.
     *    Always need to check for contained items if some item has the
     *    "containedin" argument (takes extra time!).
     */
    if (current_state.ga_len)
      cur_si = &CUR_STATE(current_state.ga_len - 1);
    else
      cur_si = NULL;

    if (syn_block->b_syn_containedin || cur_si == NULL
        || cur_si->si_cont_list != NULL) {
      /*
       * 2. Check for keywords, if on a keyword char after a non-keyword
       *	  char.  Don't do this when syncing.
       */
      if (do_keywords) {
        line = syn_getcurline();
        if (vim_iswordp_buf(line + current_col, syn_buf)
            && (current_col == 0
                || !vim_iswordp_buf(line + current_col - 1
                    - (has_mbyte
                       ? (*mb_head_off)(line, line + current_col - 1)
                       : 0)
                    , syn_buf))) {
          syn_id = check_keyword_id(line, (int)current_col,
              &endcol, &flags, &next_list, cur_si,
              &cchar);
          if (syn_id != 0) {
            push_current_state(KEYWORD_IDX);
            {
              cur_si = &CUR_STATE(current_state.ga_len - 1);
              cur_si->si_m_startcol = current_col;
              cur_si->si_h_startpos.lnum = current_lnum;
              cur_si->si_h_startpos.col = 0;            /* starts right away */
              cur_si->si_m_endpos.lnum = current_lnum;
              cur_si->si_m_endpos.col = endcol;
              cur_si->si_h_endpos.lnum = current_lnum;
              cur_si->si_h_endpos.col = endcol;
              cur_si->si_ends = TRUE;
              cur_si->si_end_idx = 0;
              cur_si->si_flags = flags;
              cur_si->si_seqnr = next_seqnr++;
              cur_si->si_cchar = cchar;
              if (current_state.ga_len > 1)
                cur_si->si_flags |=
                  CUR_STATE(current_state.ga_len - 2).si_flags
                  & HL_CONCEAL;
              cur_si->si_id = syn_id;
              cur_si->si_trans_id = syn_id;
              if (flags & HL_TRANSP) {
                if (current_state.ga_len < 2) {
                  cur_si->si_attr = 0;
                  cur_si->si_trans_id = 0;
                } else {
                  cur_si->si_attr = CUR_STATE(
                      current_state.ga_len - 2).si_attr;
                  cur_si->si_trans_id = CUR_STATE(
                      current_state.ga_len - 2).si_trans_id;
                }
              } else
                cur_si->si_attr = syn_id2attr(syn_id);
              cur_si->si_cont_list = NULL;
              cur_si->si_next_list = next_list;
              check_keepend();
            }
          }
        }
      }

      /*
       * 3. Check for patterns (only if no keyword found).
       */
      if (syn_id == 0 && syn_block->b_syn_patterns.ga_len) {
        /*
         * If we didn't check for a match yet, or we are past it, check
         * for any match with a pattern.
         */
        if (next_match_idx < 0 || next_match_col < (int)current_col) {
          /*
           * Check all relevant patterns for a match at this
           * position.  This is complicated, because matching with a
           * pattern takes quite a bit of time, thus we want to
           * avoid doing it when it's not needed.
           */
          next_match_idx = 0;                   /* no match in this line yet */
          next_match_col = MAXCOL;
          for (int idx = syn_block->b_syn_patterns.ga_len; --idx >= 0; ) {
            spp = &(SYN_ITEMS(syn_block)[idx]);
            if (       spp->sp_syncing == syncing
                       && (displaying || !(spp->sp_flags & HL_DISPLAY))
                       && (spp->sp_type == SPTYPE_MATCH
                           || spp->sp_type == SPTYPE_START)
                       && (current_next_list != NULL
                           ? in_id_list(NULL, current_next_list,
                               &spp->sp_syn, 0)
                           : (cur_si == NULL
                              ? !(spp->sp_flags & HL_CONTAINED)
                              : in_id_list(cur_si,
                                  cur_si->si_cont_list, &spp->sp_syn,
                                  spp->sp_flags & HL_CONTAINED)))) {
              /* If we already tried matching in this line, and
               * there isn't a match before next_match_col, skip
               * this item. */
              if (spp->sp_line_id == current_line_id
                  && spp->sp_startcol >= next_match_col)
                continue;
              spp->sp_line_id = current_line_id;

              lc_col = current_col - spp->sp_offsets[SPO_LC_OFF];
              if (lc_col < 0)
                lc_col = 0;

              regmatch.rmm_ic = spp->sp_ic;
              regmatch.regprog = spp->sp_prog;
              int r = syn_regexec(&regmatch, current_lnum, (colnr_T)lc_col,
                                  IF_SYN_TIME(&spp->sp_time));
              spp->sp_prog = regmatch.regprog;
              if (!r) {
                /* no match in this line, try another one */
                spp->sp_startcol = MAXCOL;
                continue;
              }

              /*
               * Compute the first column of the match.
               */
              syn_add_start_off(&pos, &regmatch,
                  spp, SPO_MS_OFF, -1);
              if (pos.lnum > current_lnum) {
                /* must have used end of match in a next line,
                 * we can't handle that */
                spp->sp_startcol = MAXCOL;
                continue;
              }
              startcol = pos.col;

              /* remember the next column where this pattern
               * matches in the current line */
              spp->sp_startcol = startcol;

              /*
               * If a previously found match starts at a lower
               * column number, don't use this one.
               */
              if (startcol >= next_match_col)
                continue;

              /*
               * If we matched this pattern at this position
               * before, skip it.  Must retry in the next
               * column, because it may match from there.
               */
              if (did_match_already(idx, &zero_width_next_ga)) {
                try_next_column = TRUE;
                continue;
              }

              endpos.lnum = regmatch.endpos[0].lnum;
              endpos.col = regmatch.endpos[0].col;

              /* Compute the highlight start. */
              syn_add_start_off(&hl_startpos, &regmatch,
                  spp, SPO_HS_OFF, -1);

              /* Compute the region start. */
              /* Default is to use the end of the match. */
              syn_add_end_off(&eos_pos, &regmatch,
                  spp, SPO_RS_OFF, 0);

              /*
               * Grab the external submatches before they get
               * overwritten.  Reference count doesn't change.
               */
              unref_extmatch(cur_extmatch);
              cur_extmatch = re_extmatch_out;
              re_extmatch_out = NULL;

              flags = 0;
              eoe_pos.lnum = 0;                 /* avoid warning */
              eoe_pos.col = 0;
              end_idx = 0;
              hl_endpos.lnum = 0;

              /*
               * For a "oneline" the end must be found in the
               * same line too.  Search for it after the end of
               * the match with the start pattern.  Set the
               * resulting end positions at the same time.
               */
              if (spp->sp_type == SPTYPE_START
                  && (spp->sp_flags & HL_ONELINE)) {
                lpos_T startpos;

                startpos = endpos;
                find_endpos(idx, &startpos, &endpos, &hl_endpos,
                    &flags, &eoe_pos, &end_idx, cur_extmatch);
                if (endpos.lnum == 0)
                  continue;                         /* not found */
              }
              /*
               * For a "match" the size must be > 0 after the
               * end offset needs has been added.  Except when
               * syncing.
               */
              else if (spp->sp_type == SPTYPE_MATCH) {
                syn_add_end_off(&hl_endpos, &regmatch, spp,
                    SPO_HE_OFF, 0);
                syn_add_end_off(&endpos, &regmatch, spp,
                    SPO_ME_OFF, 0);
                if (endpos.lnum == current_lnum
                    && (int)endpos.col + syncing < startcol) {
                  /*
                   * If an empty string is matched, may need
                   * to try matching again at next column.
                   */
                  if (regmatch.startpos[0].col
                      == regmatch.endpos[0].col)
                    try_next_column = TRUE;
                  continue;
                }
              }

              /*
               * keep the best match so far in next_match_*
               */
              /* Highlighting must start after startpos and end
               * before endpos. */
              if (hl_startpos.lnum == current_lnum
                  && (int)hl_startpos.col < startcol)
                hl_startpos.col = startcol;
              limit_pos_zero(&hl_endpos, &endpos);

              next_match_idx = idx;
              next_match_col = startcol;
              next_match_m_endpos = endpos;
              next_match_h_endpos = hl_endpos;
              next_match_h_startpos = hl_startpos;
              next_match_flags = flags;
              next_match_eos_pos = eos_pos;
              next_match_eoe_pos = eoe_pos;
              next_match_end_idx = end_idx;
              unref_extmatch(next_match_extmatch);
              next_match_extmatch = cur_extmatch;
              cur_extmatch = NULL;
            }
          }
        }

        /*
         * If we found a match at the current column, use it.
         */
        if (next_match_idx >= 0 && next_match_col == (int)current_col) {
          synpat_T    *lspp;

          /* When a zero-width item matched which has a nextgroup,
           * don't push the item but set nextgroup. */
          lspp = &(SYN_ITEMS(syn_block)[next_match_idx]);
          if (next_match_m_endpos.lnum == current_lnum
              && next_match_m_endpos.col == current_col
              && lspp->sp_next_list != NULL) {
            current_next_list = lspp->sp_next_list;
            current_next_flags = lspp->sp_flags;
            keep_next_list = TRUE;
            zero_width_next_list = TRUE;

            /* Add the index to a list, so that we can check
             * later that we don't match it again (and cause an
             * endless loop). */
            GA_APPEND(int, &zero_width_next_ga, next_match_idx);
            next_match_idx = -1;
          } else
            cur_si = push_next_match(cur_si);
          found_match = TRUE;
        }
      }
    }

    /*
     * Handle searching for nextgroup match.
     */
    if (current_next_list != NULL && !keep_next_list) {
      /*
       * If a nextgroup was not found, continue looking for one if:
       * - this is an empty line and the "skipempty" option was given
       * - we are on white space and the "skipwhite" option was given
       */
      if (!found_match) {
        line = syn_getcurline();
        if (((current_next_flags & HL_SKIPWHITE)
             && ascii_iswhite(line[current_col]))
            || ((current_next_flags & HL_SKIPEMPTY)
                && *line == NUL))
          break;
      }

      /*
       * If a nextgroup was found: Use it, and continue looking for
       * contained matches.
       * If a nextgroup was not found: Continue looking for a normal
       * match.
       * When did set current_next_list for a zero-width item and no
       * match was found don't loop (would get stuck).
       */
      current_next_list = NULL;
      next_match_idx = -1;
      if (!zero_width_next_list)
        found_match = TRUE;
    }

  } while (found_match);

  restore_chartab(buf_chartab);

  /*
   * Use attributes from the current state, if within its highlighting.
   * If not, use attributes from the current-but-one state, etc.
   */
  current_attr = 0;
  current_id = 0;
  current_trans_id = 0;
  current_flags = 0;
  if (cur_si != NULL) {
    for (int idx = current_state.ga_len - 1; idx >= 0; --idx) {
      sip = &CUR_STATE(idx);
      if ((current_lnum > sip->si_h_startpos.lnum
           || (current_lnum == sip->si_h_startpos.lnum
               && current_col >= sip->si_h_startpos.col))
          && (sip->si_h_endpos.lnum == 0
              || current_lnum < sip->si_h_endpos.lnum
              || (current_lnum == sip->si_h_endpos.lnum
                  && current_col < sip->si_h_endpos.col))) {
        current_attr = sip->si_attr;
        current_id = sip->si_id;
        current_trans_id = sip->si_trans_id;
        current_flags = sip->si_flags;
        current_seqnr = sip->si_seqnr;
        current_sub_char = sip->si_cchar;
        break;
      }
    }

    if (can_spell != NULL) {
      struct sp_syn sps;

      /*
       * set "can_spell" to TRUE if spell checking is supposed to be
       * done in the current item.
       */
      if (syn_block->b_spell_cluster_id == 0) {
        /* There is no @Spell cluster: Do spelling for items without
         * @NoSpell cluster. */
        if (syn_block->b_nospell_cluster_id == 0
            || current_trans_id == 0)
          *can_spell = (syn_block->b_syn_spell != SYNSPL_NOTOP);
        else {
          sps.inc_tag = 0;
          sps.id = syn_block->b_nospell_cluster_id;
          sps.cont_in_list = NULL;
          *can_spell = !in_id_list(sip, sip->si_cont_list, &sps, 0);
        }
      } else {
        /* The @Spell cluster is defined: Do spelling in items with
         * the @Spell cluster.  But not when @NoSpell is also there.
         * At the toplevel only spell check when ":syn spell toplevel"
         * was used. */
        if (current_trans_id == 0)
          *can_spell = (syn_block->b_syn_spell == SYNSPL_TOP);
        else {
          sps.inc_tag = 0;
          sps.id = syn_block->b_spell_cluster_id;
          sps.cont_in_list = NULL;
          *can_spell = in_id_list(sip, sip->si_cont_list, &sps, 0);

          if (syn_block->b_nospell_cluster_id != 0) {
            sps.id = syn_block->b_nospell_cluster_id;
            if (in_id_list(sip, sip->si_cont_list, &sps, 0))
              *can_spell = false;
          }
        }
      }
    }


    /*
     * Check for end of current state (and the states before it) at the
     * next column.  Don't do this for syncing, because we would miss a
     * single character match.
     * First check if the current state ends at the current column.  It
     * may be for an empty match and a containing item might end in the
     * current column.
     */
    if (!syncing && !keep_state) {
      check_state_ends();
      if (!GA_EMPTY(&current_state)
          && syn_getcurline()[current_col] != NUL) {
        ++current_col;
        check_state_ends();
        --current_col;
      }
    }
  } else if (can_spell != NULL)
    /* Default: Only do spelling when there is no @Spell cluster or when
     * ":syn spell toplevel" was used. */
    *can_spell = syn_block->b_syn_spell == SYNSPL_DEFAULT
                 ? (syn_block->b_spell_cluster_id == 0)
                 : (syn_block->b_syn_spell == SYNSPL_TOP);

  /* nextgroup ends at end of line, unless "skipnl" or "skipempty" present */
  if (current_next_list != NULL
      && syn_getcurline()[current_col + 1] == NUL
      && !(current_next_flags & (HL_SKIPNL | HL_SKIPEMPTY)))
    current_next_list = NULL;

  if (!GA_EMPTY(&zero_width_next_ga))
    ga_clear(&zero_width_next_ga);

  /* No longer need external matches.  But keep next_match_extmatch. */
  unref_extmatch(re_extmatch_out);
  re_extmatch_out = NULL;
  unref_extmatch(cur_extmatch);

  return current_attr;
}


/*
 * Check if we already matched pattern "idx" at the current column.
 */
static int did_match_already(int idx, garray_T *gap)
{
  for (int i = current_state.ga_len; --i >= 0; ) {
    if (CUR_STATE(i).si_m_startcol == (int)current_col
        && CUR_STATE(i).si_m_lnum == (int)current_lnum
        && CUR_STATE(i).si_idx == idx) {
      return TRUE;
    }
  }

  /* Zero-width matches with a nextgroup argument are not put on the syntax
   * stack, and can only be matched once anyway. */
  for (int i = gap->ga_len; --i >= 0; ) {
    if (((int *)(gap->ga_data))[i] == idx) {
      return TRUE;
    }
  }

  return FALSE;
}

/*
 * Push the next match onto the stack.
 */
static stateitem_T *push_next_match(stateitem_T *cur_si)
{
  synpat_T    *spp;
  int save_flags;

  spp = &(SYN_ITEMS(syn_block)[next_match_idx]);

  /*
   * Push the item in current_state stack;
   */
  push_current_state(next_match_idx);
  {
    /*
     * If it's a start-skip-end type that crosses lines, figure out how
     * much it continues in this line.  Otherwise just fill in the length.
     */
    cur_si = &CUR_STATE(current_state.ga_len - 1);
    cur_si->si_h_startpos = next_match_h_startpos;
    cur_si->si_m_startcol = current_col;
    cur_si->si_m_lnum = current_lnum;
    cur_si->si_flags = spp->sp_flags;
    cur_si->si_seqnr = next_seqnr++;
    cur_si->si_cchar = spp->sp_cchar;
    if (current_state.ga_len > 1)
      cur_si->si_flags |=
        CUR_STATE(current_state.ga_len - 2).si_flags & HL_CONCEAL;
    cur_si->si_next_list = spp->sp_next_list;
    cur_si->si_extmatch = ref_extmatch(next_match_extmatch);
    if (spp->sp_type == SPTYPE_START && !(spp->sp_flags & HL_ONELINE)) {
      /* Try to find the end pattern in the current line */
      update_si_end(cur_si, (int)(next_match_m_endpos.col), TRUE);
      check_keepend();
    } else {
      cur_si->si_m_endpos = next_match_m_endpos;
      cur_si->si_h_endpos = next_match_h_endpos;
      cur_si->si_ends = TRUE;
      cur_si->si_flags |= next_match_flags;
      cur_si->si_eoe_pos = next_match_eoe_pos;
      cur_si->si_end_idx = next_match_end_idx;
    }
    if (keepend_level < 0 && (cur_si->si_flags & HL_KEEPEND))
      keepend_level = current_state.ga_len - 1;
    check_keepend();
    update_si_attr(current_state.ga_len - 1);

    save_flags = cur_si->si_flags & (HL_CONCEAL | HL_CONCEALENDS);
    /*
     * If the start pattern has another highlight group, push another item
     * on the stack for the start pattern.
     */
    if (spp->sp_type == SPTYPE_START && spp->sp_syn_match_id != 0) {
      push_current_state(next_match_idx);
      cur_si = &CUR_STATE(current_state.ga_len - 1);
      cur_si->si_h_startpos = next_match_h_startpos;
      cur_si->si_m_startcol = current_col;
      cur_si->si_m_lnum = current_lnum;
      cur_si->si_m_endpos = next_match_eos_pos;
      cur_si->si_h_endpos = next_match_eos_pos;
      cur_si->si_ends = TRUE;
      cur_si->si_end_idx = 0;
      cur_si->si_flags = HL_MATCH;
      cur_si->si_seqnr = next_seqnr++;
      cur_si->si_flags |= save_flags;
      if (cur_si->si_flags & HL_CONCEALENDS)
        cur_si->si_flags |= HL_CONCEAL;
      cur_si->si_next_list = NULL;
      check_keepend();
      update_si_attr(current_state.ga_len - 1);
    }
  }

  next_match_idx = -1;          /* try other match next time */

  return cur_si;
}

/*
 * Check for end of current state (and the states before it).
 */
static void check_state_ends(void)
{
  stateitem_T *cur_si;
  int had_extend;

  cur_si = &CUR_STATE(current_state.ga_len - 1);
  for (;; ) {
    if (cur_si->si_ends
        && (cur_si->si_m_endpos.lnum < current_lnum
            || (cur_si->si_m_endpos.lnum == current_lnum
                && cur_si->si_m_endpos.col <= current_col))) {
      /*
       * If there is an end pattern group ID, highlight the end pattern
       * now.  No need to pop the current item from the stack.
       * Only do this if the end pattern continues beyond the current
       * position.
       */
      if (cur_si->si_end_idx
          && (cur_si->si_eoe_pos.lnum > current_lnum
              || (cur_si->si_eoe_pos.lnum == current_lnum
                  && cur_si->si_eoe_pos.col > current_col))) {
        cur_si->si_idx = cur_si->si_end_idx;
        cur_si->si_end_idx = 0;
        cur_si->si_m_endpos = cur_si->si_eoe_pos;
        cur_si->si_h_endpos = cur_si->si_eoe_pos;
        cur_si->si_flags |= HL_MATCH;
        cur_si->si_seqnr = next_seqnr++;
        if (cur_si->si_flags & HL_CONCEALENDS)
          cur_si->si_flags |= HL_CONCEAL;
        update_si_attr(current_state.ga_len - 1);

        /* nextgroup= should not match in the end pattern */
        current_next_list = NULL;

        /* what matches next may be different now, clear it */
        next_match_idx = 0;
        next_match_col = MAXCOL;
        break;
      } else {
        /* handle next_list, unless at end of line and no "skipnl" or
         * "skipempty" */
        current_next_list = cur_si->si_next_list;
        current_next_flags = cur_si->si_flags;
        if (!(current_next_flags & (HL_SKIPNL | HL_SKIPEMPTY))
            && syn_getcurline()[current_col] == NUL)
          current_next_list = NULL;

        /* When the ended item has "extend", another item with
         * "keepend" now needs to check for its end. */
        had_extend = (cur_si->si_flags & HL_EXTEND);

        pop_current_state();

        if (GA_EMPTY(&current_state))
          break;

        if (had_extend && keepend_level >= 0) {
          syn_update_ends(FALSE);
          if (GA_EMPTY(&current_state))
            break;
        }

        cur_si = &CUR_STATE(current_state.ga_len - 1);

        /*
         * Only for a region the search for the end continues after
         * the end of the contained item.  If the contained match
         * included the end-of-line, break here, the region continues.
         * Don't do this when:
         * - "keepend" is used for the contained item
         * - not at the end of the line (could be end="x$"me=e-1).
         * - "excludenl" is used (HL_HAS_EOL won't be set)
         */
        if (cur_si->si_idx >= 0
            && SYN_ITEMS(syn_block)[cur_si->si_idx].sp_type
            == SPTYPE_START
            && !(cur_si->si_flags & (HL_MATCH | HL_KEEPEND))) {
          update_si_end(cur_si, (int)current_col, TRUE);
          check_keepend();
          if ((current_next_flags & HL_HAS_EOL)
              && keepend_level < 0
              && syn_getcurline()[current_col] == NUL)
            break;
        }
      }
    } else
      break;
  }
}

/*
 * Update an entry in the current_state stack for a match or region.  This
 * fills in si_attr, si_next_list and si_cont_list.
 */
static void update_si_attr(int idx)
{
  stateitem_T *sip = &CUR_STATE(idx);
  synpat_T    *spp;

  /* This should not happen... */
  if (sip->si_idx < 0)
    return;

  spp = &(SYN_ITEMS(syn_block)[sip->si_idx]);
  if (sip->si_flags & HL_MATCH)
    sip->si_id = spp->sp_syn_match_id;
  else
    sip->si_id = spp->sp_syn.id;
  sip->si_attr = syn_id2attr(sip->si_id);
  sip->si_trans_id = sip->si_id;
  if (sip->si_flags & HL_MATCH)
    sip->si_cont_list = NULL;
  else
    sip->si_cont_list = spp->sp_cont_list;

  /*
   * For transparent items, take attr from outer item.
   * Also take cont_list, if there is none.
   * Don't do this for the matchgroup of a start or end pattern.
   */
  if ((spp->sp_flags & HL_TRANSP) && !(sip->si_flags & HL_MATCH)) {
    if (idx == 0) {
      sip->si_attr = 0;
      sip->si_trans_id = 0;
      if (sip->si_cont_list == NULL)
        sip->si_cont_list = ID_LIST_ALL;
    } else {
      sip->si_attr = CUR_STATE(idx - 1).si_attr;
      sip->si_trans_id = CUR_STATE(idx - 1).si_trans_id;
      sip->si_h_startpos = CUR_STATE(idx - 1).si_h_startpos;
      sip->si_h_endpos = CUR_STATE(idx - 1).si_h_endpos;
      if (sip->si_cont_list == NULL) {
        sip->si_flags |= HL_TRANS_CONT;
        sip->si_cont_list = CUR_STATE(idx - 1).si_cont_list;
      }
    }
  }
}

/*
 * Check the current stack for patterns with "keepend" flag.
 * Propagate the match-end to contained items, until a "skipend" item is found.
 */
static void check_keepend(void)
{
  int i;
  lpos_T maxpos;
  lpos_T maxpos_h;
  stateitem_T *sip;

  /*
   * This check can consume a lot of time; only do it from the level where
   * there really is a keepend.
   */
  if (keepend_level < 0)
    return;

  /*
   * Find the last index of an "extend" item.  "keepend" items before that
   * won't do anything.  If there is no "extend" item "i" will be
   * "keepend_level" and all "keepend" items will work normally.
   */
  for (i = current_state.ga_len - 1; i > keepend_level; --i)
    if (CUR_STATE(i).si_flags & HL_EXTEND)
      break;

  maxpos.lnum = 0;
  maxpos.col = 0;
  maxpos_h.lnum = 0;
  maxpos_h.col = 0;
  for (; i < current_state.ga_len; ++i) {
    sip = &CUR_STATE(i);
    if (maxpos.lnum != 0) {
      limit_pos_zero(&sip->si_m_endpos, &maxpos);
      limit_pos_zero(&sip->si_h_endpos, &maxpos_h);
      limit_pos_zero(&sip->si_eoe_pos, &maxpos);
      sip->si_ends = TRUE;
    }
    if (sip->si_ends && (sip->si_flags & HL_KEEPEND)) {
      if (maxpos.lnum == 0
          || maxpos.lnum > sip->si_m_endpos.lnum
          || (maxpos.lnum == sip->si_m_endpos.lnum
              && maxpos.col > sip->si_m_endpos.col))
        maxpos = sip->si_m_endpos;
      if (maxpos_h.lnum == 0
          || maxpos_h.lnum > sip->si_h_endpos.lnum
          || (maxpos_h.lnum == sip->si_h_endpos.lnum
              && maxpos_h.col > sip->si_h_endpos.col))
        maxpos_h = sip->si_h_endpos;
    }
  }
}

/*
 * Update an entry in the current_state stack for a start-skip-end pattern.
 * This finds the end of the current item, if it's in the current line.
 *
 * Return the flags for the matched END.
 */
static void 
update_si_end (
    stateitem_T *sip,
    int startcol,               /* where to start searching for the end */
    int force                  /* when TRUE overrule a previous end */
)
{
  lpos_T startpos;
  lpos_T endpos;
  lpos_T hl_endpos;
  lpos_T end_endpos;
  int end_idx;

  /* return quickly for a keyword */
  if (sip->si_idx < 0)
    return;

  /* Don't update when it's already done.  Can be a match of an end pattern
   * that started in a previous line.  Watch out: can also be a "keepend"
   * from a containing item. */
  if (!force && sip->si_m_endpos.lnum >= current_lnum)
    return;

  /*
   * We need to find the end of the region.  It may continue in the next
   * line.
   */
  end_idx = 0;
  startpos.lnum = current_lnum;
  startpos.col = startcol;
  find_endpos(sip->si_idx, &startpos, &endpos, &hl_endpos,
      &(sip->si_flags), &end_endpos, &end_idx, sip->si_extmatch);

  if (endpos.lnum == 0) {
    /* No end pattern matched. */
    if (SYN_ITEMS(syn_block)[sip->si_idx].sp_flags & HL_ONELINE) {
      /* a "oneline" never continues in the next line */
      sip->si_ends = TRUE;
      sip->si_m_endpos.lnum = current_lnum;
      sip->si_m_endpos.col = (colnr_T)STRLEN(syn_getcurline());
    } else {
      /* continues in the next line */
      sip->si_ends = FALSE;
      sip->si_m_endpos.lnum = 0;
    }
    sip->si_h_endpos = sip->si_m_endpos;
  } else {
    /* match within this line */
    sip->si_m_endpos = endpos;
    sip->si_h_endpos = hl_endpos;
    sip->si_eoe_pos = end_endpos;
    sip->si_ends = TRUE;
    sip->si_end_idx = end_idx;
  }
}

/*
 * Add a new state to the current state stack.
 * It is cleared and the index set to "idx".
 */
static void push_current_state(int idx)
{
  stateitem_T *p = GA_APPEND_VIA_PTR(stateitem_T, &current_state);
  memset(p, 0, sizeof(*p));
  p->si_idx = idx;
}

/*
 * Remove a state from the current_state stack.
 */
static void pop_current_state(void)
{
  if (!GA_EMPTY(&current_state)) {
    unref_extmatch(CUR_STATE(current_state.ga_len - 1).si_extmatch);
    --current_state.ga_len;
  }
  /* after the end of a pattern, try matching a keyword or pattern */
  next_match_idx = -1;

  /* if first state with "keepend" is popped, reset keepend_level */
  if (keepend_level >= current_state.ga_len)
    keepend_level = -1;
}

/*
 * Find the end of a start/skip/end syntax region after "startpos".
 * Only checks one line.
 * Also handles a match item that continued from a previous line.
 * If not found, the syntax item continues in the next line.  m_endpos->lnum
 * will be 0.
 * If found, the end of the region and the end of the highlighting is
 * computed.
 */
static void 
find_endpos (
    int idx,                        /* index of the pattern */
    lpos_T *startpos,          /* where to start looking for an END match */
    lpos_T *m_endpos,          /* return: end of match */
    lpos_T *hl_endpos,         /* return: end of highlighting */
    long *flagsp,            /* return: flags of matching END */
    lpos_T *end_endpos,        /* return: end of end pattern match */
    int *end_idx,           /* return: group ID for end pat. match, or 0 */
    reg_extmatch_T *start_ext      /* submatches from the start pattern */
)
{
  colnr_T matchcol;
  synpat_T    *spp, *spp_skip;
  int start_idx;
  int best_idx;
  regmmatch_T regmatch;
  regmmatch_T best_regmatch;        /* startpos/endpos of best match */
  lpos_T pos;
  char_u      *line;
  int had_match = false;
  char_u buf_chartab[32];  // chartab array for syn option iskeyword

  /* just in case we are invoked for a keyword */
  if (idx < 0)
    return;

  /*
   * Check for being called with a START pattern.
   * Can happen with a match that continues to the next line, because it
   * contained a region.
   */
  spp = &(SYN_ITEMS(syn_block)[idx]);
  if (spp->sp_type != SPTYPE_START) {
    *hl_endpos = *startpos;
    return;
  }

  /*
   * Find the SKIP or first END pattern after the last START pattern.
   */
  for (;; ) {
    spp = &(SYN_ITEMS(syn_block)[idx]);
    if (spp->sp_type != SPTYPE_START)
      break;
    ++idx;
  }

  /*
   *	Lookup the SKIP pattern (if present)
   */
  if (spp->sp_type == SPTYPE_SKIP) {
    spp_skip = spp;
    ++idx;
  } else
    spp_skip = NULL;

  /* Setup external matches for syn_regexec(). */
  unref_extmatch(re_extmatch_in);
  re_extmatch_in = ref_extmatch(start_ext);

  matchcol = startpos->col;     // start looking for a match at sstart
  start_idx = idx;              // remember the first END pattern.
  best_regmatch.startpos[0].col = 0;            // avoid compiler warning

  // use syntax iskeyword option
  save_chartab(buf_chartab);

  for (;; ) {
    /*
     * Find end pattern that matches first after "matchcol".
     */
    best_idx = -1;
    for (idx = start_idx; idx < syn_block->b_syn_patterns.ga_len; ++idx) {
      int lc_col = matchcol;

      spp = &(SYN_ITEMS(syn_block)[idx]);
      if (spp->sp_type != SPTYPE_END)           /* past last END pattern */
        break;
      lc_col -= spp->sp_offsets[SPO_LC_OFF];
      if (lc_col < 0)
        lc_col = 0;

      regmatch.rmm_ic = spp->sp_ic;
      regmatch.regprog = spp->sp_prog;
      int r = syn_regexec(&regmatch, startpos->lnum, lc_col,
                          IF_SYN_TIME(&spp->sp_time));
      spp->sp_prog = regmatch.regprog;
      if (r) {
        if (best_idx == -1 || regmatch.startpos[0].col
            < best_regmatch.startpos[0].col) {
          best_idx = idx;
          best_regmatch.startpos[0] = regmatch.startpos[0];
          best_regmatch.endpos[0] = regmatch.endpos[0];
        }
      }
    }

    /*
     * If all end patterns have been tried, and there is no match, the
     * item continues until end-of-line.
     */
    if (best_idx == -1)
      break;

    /*
     * If the skip pattern matches before the end pattern,
     * continue searching after the skip pattern.
     */
    if (spp_skip != NULL) {
      int lc_col = matchcol - spp_skip->sp_offsets[SPO_LC_OFF];

      if (lc_col < 0)
        lc_col = 0;
      regmatch.rmm_ic = spp_skip->sp_ic;
      regmatch.regprog = spp_skip->sp_prog;
      int r = syn_regexec(&regmatch, startpos->lnum, lc_col,
                          IF_SYN_TIME(&spp_skip->sp_time));
      spp_skip->sp_prog = regmatch.regprog;
      if (r && regmatch.startpos[0].col <= best_regmatch.startpos[0].col) {
        // Add offset to skip pattern match
        syn_add_end_off(&pos, &regmatch, spp_skip, SPO_ME_OFF, 1);

        // If the skip pattern goes on to the next line, there is no
        // match with an end pattern in this line.
        if (pos.lnum > startpos->lnum) {
          break;
        }

        line = ml_get_buf(syn_buf, startpos->lnum, false);
        int line_len = (int)STRLEN(line);

        // take care of an empty match or negative offset
        if (pos.col <= matchcol) {
          matchcol++;
        } else if (pos.col <= regmatch.endpos[0].col) {
          matchcol = pos.col;
        } else {
          // Be careful not to jump over the NUL at the end-of-line
          for (matchcol = regmatch.endpos[0].col;
               matchcol < line_len && matchcol < pos.col;
               matchcol++) {
          }
        }

        // if the skip pattern includes end-of-line, break here
        if (matchcol >= line_len) {
          break;
        }

        continue;  // start with first end pattern again
      }
    }

    /*
     * Match from start pattern to end pattern.
     * Correct for match and highlight offset of end pattern.
     */
    spp = &(SYN_ITEMS(syn_block)[best_idx]);
    syn_add_end_off(m_endpos, &best_regmatch, spp, SPO_ME_OFF, 1);
    /* can't end before the start */
    if (m_endpos->lnum == startpos->lnum && m_endpos->col < startpos->col)
      m_endpos->col = startpos->col;

    syn_add_end_off(end_endpos, &best_regmatch, spp, SPO_HE_OFF, 1);
    /* can't end before the start */
    if (end_endpos->lnum == startpos->lnum
        && end_endpos->col < startpos->col)
      end_endpos->col = startpos->col;
    /* can't end after the match */
    limit_pos(end_endpos, m_endpos);

    /*
     * If the end group is highlighted differently, adjust the pointers.
     */
    if (spp->sp_syn_match_id != spp->sp_syn.id && spp->sp_syn_match_id != 0) {
      *end_idx = best_idx;
      if (spp->sp_off_flags & (1 << (SPO_RE_OFF + SPO_COUNT))) {
        hl_endpos->lnum = best_regmatch.endpos[0].lnum;
        hl_endpos->col = best_regmatch.endpos[0].col;
      } else {
        hl_endpos->lnum = best_regmatch.startpos[0].lnum;
        hl_endpos->col = best_regmatch.startpos[0].col;
      }
      hl_endpos->col += spp->sp_offsets[SPO_RE_OFF];

      /* can't end before the start */
      if (hl_endpos->lnum == startpos->lnum
          && hl_endpos->col < startpos->col)
        hl_endpos->col = startpos->col;
      limit_pos(hl_endpos, m_endpos);

      /* now the match ends where the highlighting ends, it is turned
       * into the matchgroup for the end */
      *m_endpos = *hl_endpos;
    } else {
      *end_idx = 0;
      *hl_endpos = *end_endpos;
    }

    *flagsp = spp->sp_flags;

    had_match = TRUE;
    break;
  }

  /* no match for an END pattern in this line */
  if (!had_match)
    m_endpos->lnum = 0;

  restore_chartab(buf_chartab);

  /* Remove external matches. */
  unref_extmatch(re_extmatch_in);
  re_extmatch_in = NULL;
}

/*
 * Limit "pos" not to be after "limit".
 */
static void limit_pos(lpos_T *pos, lpos_T *limit)
{
  if (pos->lnum > limit->lnum)
    *pos = *limit;
  else if (pos->lnum == limit->lnum && pos->col > limit->col)
    pos->col = limit->col;
}

/*
 * Limit "pos" not to be after "limit", unless pos->lnum is zero.
 */
static void limit_pos_zero(lpos_T *pos, lpos_T *limit)
{
  if (pos->lnum == 0)
    *pos = *limit;
  else
    limit_pos(pos, limit);
}

/*
 * Add offset to matched text for end of match or highlight.
 */
static void 
syn_add_end_off (
    lpos_T *result,            /* returned position */
    regmmatch_T *regmatch,          /* start/end of match */
    synpat_T *spp,               /* matched pattern */
    int idx,                        /* index of offset */
    int extra                      /* extra chars for offset to start */
)
{
  int col;
  int off;
  char_u      *base;
  char_u      *p;

  if (spp->sp_off_flags & (1 << idx)) {
    result->lnum = regmatch->startpos[0].lnum;
    col = regmatch->startpos[0].col;
    off = spp->sp_offsets[idx] + extra;
  } else {
    result->lnum = regmatch->endpos[0].lnum;
    col = regmatch->endpos[0].col;
    off = spp->sp_offsets[idx];
  }
  /* Don't go past the end of the line.  Matters for "rs=e+2" when there
   * is a matchgroup. Watch out for match with last NL in the buffer. */
  if (result->lnum > syn_buf->b_ml.ml_line_count)
    col = 0;
  else if (off != 0) {
    base = ml_get_buf(syn_buf, result->lnum, FALSE);
    p = base + col;
    if (off > 0) {
      while (off-- > 0 && *p != NUL)
        mb_ptr_adv(p);
    } else if (off < 0)   {
      while (off++ < 0 && base < p)
        mb_ptr_back(base, p);
    }
    col = (int)(p - base);
  }
  result->col = col;
}

/*
 * Add offset to matched text for start of match or highlight.
 * Avoid resulting column to become negative.
 */
static void 
syn_add_start_off (
    lpos_T *result,            /* returned position */
    regmmatch_T *regmatch,          /* start/end of match */
    synpat_T *spp,
    int idx,
    int extra                  /* extra chars for offset to end */
)
{
  int col;
  int off;
  char_u      *base;
  char_u      *p;

  if (spp->sp_off_flags & (1 << (idx + SPO_COUNT))) {
    result->lnum = regmatch->endpos[0].lnum;
    col = regmatch->endpos[0].col;
    off = spp->sp_offsets[idx] + extra;
  } else {
    result->lnum = regmatch->startpos[0].lnum;
    col = regmatch->startpos[0].col;
    off = spp->sp_offsets[idx];
  }
  if (result->lnum > syn_buf->b_ml.ml_line_count) {
    /* a "\n" at the end of the pattern may take us below the last line */
    result->lnum = syn_buf->b_ml.ml_line_count;
    col = (int)STRLEN(ml_get_buf(syn_buf, result->lnum, FALSE));
  }
  if (off != 0) {
    base = ml_get_buf(syn_buf, result->lnum, FALSE);
    p = base + col;
    if (off > 0) {
      while (off-- && *p != NUL)
        mb_ptr_adv(p);
    } else if (off < 0)   {
      while (off++ && base < p)
        mb_ptr_back(base, p);
    }
    col = (int)(p - base);
  }
  result->col = col;
}

/*
 * Get current line in syntax buffer.
 */
static char_u *syn_getcurline(void)
{
  return ml_get_buf(syn_buf, current_lnum, FALSE);
}

/*
 * Call vim_regexec() to find a match with "rmp" in "syn_buf".
 * Returns TRUE when there is a match.
 */
static int syn_regexec(regmmatch_T *rmp, linenr_T lnum, colnr_T col, syn_time_T *st)
{
  int r;
  proftime_T pt;
  const int l_syn_time_on = syn_time_on;

  if (l_syn_time_on) {
    pt = profile_start();
  }

  rmp->rmm_maxcol = syn_buf->b_p_smc;
  r = vim_regexec_multi(rmp, syn_win, syn_buf, lnum, col, NULL);

  if (l_syn_time_on) {
    pt = profile_end(pt);
    st->total = profile_add(st->total, pt);
    if (profile_cmp(pt, st->slowest) < 0) {
      st->slowest = pt;
    }
    ++st->count;
    if (r > 0)
      ++st->match;
  }

  if (r > 0) {
    rmp->startpos[0].lnum += lnum;
    rmp->endpos[0].lnum += lnum;
    return TRUE;
  }
  return FALSE;
}

/*
 * Check one position in a line for a matching keyword.
 * The caller must check if a keyword can start at startcol.
 * Return it's ID if found, 0 otherwise.
 */
static int 
check_keyword_id (
    char_u *line,
    int startcol,                   /* position in line to check for keyword */
    int *endcolp,           /* return: character after found keyword */
    long *flagsp,            /* return: flags of matching keyword */
    short **next_listp,       /* return: next_list of matching keyword */
    stateitem_T *cur_si,            /* item at the top of the stack */
    int *ccharp     /* conceal substitution char */
)
{
  char_u      *kwp;
  int kwlen;
  char_u keyword[MAXKEYWLEN + 1];        /* assume max. keyword len is 80 */

  /* Find first character after the keyword.  First character was already
   * checked. */
  kwp = line + startcol;
  kwlen = 0;
  do {
    if (has_mbyte)
      kwlen += (*mb_ptr2len)(kwp + kwlen);
    else
      ++kwlen;
  } while (vim_iswordp_buf(kwp + kwlen, syn_buf));

  if (kwlen > MAXKEYWLEN)
    return 0;

  /*
   * Must make a copy of the keyword, so we can add a NUL and make it
   * lowercase.
   */
  STRLCPY(keyword, kwp, kwlen + 1);

  keyentry_T *kp = NULL;

  // matching case
  if (syn_block->b_keywtab.ht_used != 0) {
    kp = match_keyword(keyword, &syn_block->b_keywtab, cur_si);
  }

  // ignoring case
  if (kp == NULL && syn_block->b_keywtab_ic.ht_used != 0) {
    str_foldcase(kwp, kwlen, keyword, MAXKEYWLEN + 1);
    kp = match_keyword(keyword, &syn_block->b_keywtab_ic, cur_si);
  }

  if (kp != NULL) {
    *endcolp = startcol + kwlen;
    *flagsp = kp->flags;
    *next_listp = kp->next_list;
    *ccharp = kp->k_char;
    return kp->k_syn.id;
  }

  return 0;
}

/// Find keywords that match.  There can be several with different
/// attributes.
/// When current_next_list is non-zero accept only that group, otherwise:
///  Accept a not-contained keyword at toplevel.
///  Accept a keyword at other levels only if it is in the contains list.
static keyentry_T *match_keyword(char_u *keyword, hashtab_T *ht,
                                 stateitem_T *cur_si)
{
  hashitem_T *hi = hash_find(ht, keyword);
  if (!HASHITEM_EMPTY(hi))
    for (keyentry_T *kp = HI2KE(hi); kp != NULL; kp = kp->ke_next) {
      if (current_next_list != 0
          ? in_id_list(NULL, current_next_list, &kp->k_syn, 0)
          : (cur_si == NULL
            ? !(kp->flags & HL_CONTAINED)
            : in_id_list(cur_si, cur_si->si_cont_list,
                         &kp->k_syn, kp->flags & HL_CONTAINED))) {
        return kp;
      }
    }
  return NULL;
}

/*
 * Handle ":syntax conceal" command.
 */
static void syn_cmd_conceal(exarg_T *eap, int syncing)
{
  char_u      *arg = eap->arg;
  char_u      *next;

  eap->nextcmd = find_nextcmd(arg);
  if (eap->skip)
    return;

  next = skiptowhite(arg);
  if (STRNICMP(arg, "on", 2) == 0 && next - arg == 2)
    curwin->w_s->b_syn_conceal = TRUE;
  else if (STRNICMP(arg, "off", 3) == 0 && next - arg == 3)
    curwin->w_s->b_syn_conceal = FALSE;
  else
    EMSG2(_("E390: Illegal argument: %s"), arg);
}

/*
 * Handle ":syntax case" command.
 */
static void syn_cmd_case(exarg_T *eap, int syncing)
{
  char_u      *arg = eap->arg;
  char_u      *next;

  eap->nextcmd = find_nextcmd(arg);
  if (eap->skip)
    return;

  next = skiptowhite(arg);
  if (STRNICMP(arg, "match", 5) == 0 && next - arg == 5)
    curwin->w_s->b_syn_ic = FALSE;
  else if (STRNICMP(arg, "ignore", 6) == 0 && next - arg == 6)
    curwin->w_s->b_syn_ic = TRUE;
  else
    EMSG2(_("E390: Illegal argument: %s"), arg);
}

/*
 * Handle ":syntax spell" command.
 */
static void syn_cmd_spell(exarg_T *eap, int syncing)
{
  char_u      *arg = eap->arg;
  char_u      *next;

  eap->nextcmd = find_nextcmd(arg);
  if (eap->skip)
    return;

  next = skiptowhite(arg);
  if (STRNICMP(arg, "toplevel", 8) == 0 && next - arg == 8) {
    curwin->w_s->b_syn_spell = SYNSPL_TOP;
  } else if (STRNICMP(arg, "notoplevel", 10) == 0 && next - arg == 10) {
    curwin->w_s->b_syn_spell = SYNSPL_NOTOP;
  } else if (STRNICMP(arg, "default", 7) == 0 && next - arg == 7) {
    curwin->w_s->b_syn_spell = SYNSPL_DEFAULT;
  } else {
    EMSG2(_("E390: Illegal argument: %s"), arg);
    return;
  }

  // assume spell checking changed, force a redraw
  redraw_win_later(curwin, NOT_VALID);
}

/// Handle ":syntax iskeyword" command.
static void syn_cmd_iskeyword(exarg_T *eap, int syncing)
{
  char_u *arg = eap->arg;
  char_u save_chartab[32];
  char_u *save_isk;

  if (eap->skip) {
    return;
  }

  arg = skipwhite(arg);
  if (*arg == NUL) {
    MSG_PUTS("\n");
    MSG_PUTS(_("syntax iskeyword "));
    if (curwin->w_s->b_syn_isk != empty_option) {
      msg_outtrans(curwin->w_s->b_syn_isk);
    } else {
      msg_outtrans((char_u *)"not set");
    }
  } else {
    if (STRNICMP(arg, "clear", 5) == 0) {
      memmove(curwin->w_s->b_syn_chartab, curbuf->b_chartab, (size_t)32);
      clear_string_option(&curwin->w_s->b_syn_isk);
    } else {
      memmove(save_chartab, curbuf->b_chartab, (size_t)32);
      save_isk = curbuf->b_p_isk;
      curbuf->b_p_isk = vim_strsave(arg);

      buf_init_chartab(curbuf, false);
      memmove(curwin->w_s->b_syn_chartab, curbuf->b_chartab, (size_t)32);
      memmove(curbuf->b_chartab, save_chartab, (size_t)32);
      clear_string_option(&curwin->w_s->b_syn_isk);
      curwin->w_s->b_syn_isk = curbuf->b_p_isk;
      curbuf->b_p_isk = save_isk;
    }
  }
  redraw_win_later(curwin, NOT_VALID);
}

/*
 * Clear all syntax info for one buffer.
 */
void syntax_clear(synblock_T *block)
{
  block->b_syn_error = FALSE;       /* clear previous error */
  block->b_syn_ic = FALSE;          /* Use case, by default */
  block->b_syn_spell = SYNSPL_DEFAULT;   /* default spell checking */
  block->b_syn_containedin = FALSE;

  /* free the keywords */
  clear_keywtab(&block->b_keywtab);
  clear_keywtab(&block->b_keywtab_ic);

  /* free the syntax patterns */
  for (int i = block->b_syn_patterns.ga_len; --i >= 0; ) {
    syn_clear_pattern(block, i);
  }
  ga_clear(&block->b_syn_patterns);

  /* free the syntax clusters */
  for (int i = block->b_syn_clusters.ga_len; --i >= 0; ) {
    syn_clear_cluster(block, i);
  }
  ga_clear(&block->b_syn_clusters);
  block->b_spell_cluster_id = 0;
  block->b_nospell_cluster_id = 0;

  block->b_syn_sync_flags = 0;
  block->b_syn_sync_minlines = 0;
  block->b_syn_sync_maxlines = 0;
  block->b_syn_sync_linebreaks = 0;

  vim_regfree(block->b_syn_linecont_prog);
  block->b_syn_linecont_prog = NULL;
  xfree(block->b_syn_linecont_pat);
  block->b_syn_linecont_pat = NULL;
  block->b_syn_folditems = 0;
  clear_string_option(&block->b_syn_isk);

  /* free the stored states */
  syn_stack_free_all(block);
  invalidate_current_state();

  /* Reset the counter for ":syn include" */
  running_syn_inc_tag = 0;
}

/*
 * Get rid of ownsyntax for window "wp".
 */
void reset_synblock(win_T *wp)
{
  if (wp->w_s != &wp->w_buffer->b_s) {
    syntax_clear(wp->w_s);
    xfree(wp->w_s);
    wp->w_s = &wp->w_buffer->b_s;
  }
}

/*
 * Clear syncing info for one buffer.
 */
static void syntax_sync_clear(void)
{
  /* free the syntax patterns */
  for (int i = curwin->w_s->b_syn_patterns.ga_len; --i >= 0; ) {
    if (SYN_ITEMS(curwin->w_s)[i].sp_syncing) {
      syn_remove_pattern(curwin->w_s, i);
    }
  }

  curwin->w_s->b_syn_sync_flags = 0;
  curwin->w_s->b_syn_sync_minlines = 0;
  curwin->w_s->b_syn_sync_maxlines = 0;
  curwin->w_s->b_syn_sync_linebreaks = 0;

  vim_regfree(curwin->w_s->b_syn_linecont_prog);
  curwin->w_s->b_syn_linecont_prog = NULL;
  xfree(curwin->w_s->b_syn_linecont_pat);
  curwin->w_s->b_syn_linecont_pat = NULL;
  clear_string_option(&curwin->w_s->b_syn_isk);

  syn_stack_free_all(curwin->w_s);              /* Need to recompute all syntax. */
}

/*
 * Remove one pattern from the buffer's pattern list.
 */
static void syn_remove_pattern(synblock_T *block, int idx)
{
  synpat_T    *spp;

  spp = &(SYN_ITEMS(block)[idx]);
  if (spp->sp_flags & HL_FOLD)
    --block->b_syn_folditems;
  syn_clear_pattern(block, idx);
  memmove(spp, spp + 1,
      sizeof(synpat_T) * (block->b_syn_patterns.ga_len - idx - 1));
  --block->b_syn_patterns.ga_len;
}

/*
 * Clear and free one syntax pattern.  When clearing all, must be called from
 * last to first!
 */
static void syn_clear_pattern(synblock_T *block, int i)
{
  xfree(SYN_ITEMS(block)[i].sp_pattern);
  vim_regfree(SYN_ITEMS(block)[i].sp_prog);
  /* Only free sp_cont_list and sp_next_list of first start pattern */
  if (i == 0 || SYN_ITEMS(block)[i - 1].sp_type != SPTYPE_START) {
    xfree(SYN_ITEMS(block)[i].sp_cont_list);
    xfree(SYN_ITEMS(block)[i].sp_next_list);
    xfree(SYN_ITEMS(block)[i].sp_syn.cont_in_list);
  }
}

/*
 * Clear and free one syntax cluster.
 */
static void syn_clear_cluster(synblock_T *block, int i)
{
  xfree(SYN_CLSTR(block)[i].scl_name);
  xfree(SYN_CLSTR(block)[i].scl_name_u);
  xfree(SYN_CLSTR(block)[i].scl_list);
}

/*
 * Handle ":syntax clear" command.
 */
static void syn_cmd_clear(exarg_T *eap, int syncing)
{
  char_u      *arg = eap->arg;
  char_u      *arg_end;
  int id;

  eap->nextcmd = find_nextcmd(arg);
  if (eap->skip)
    return;

  /*
   * We have to disable this within ":syn include @group filename",
   * because otherwise @group would get deleted.
   * Only required for Vim 5.x syntax files, 6.0 ones don't contain ":syn
   * clear".
   */
  if (curwin->w_s->b_syn_topgrp != 0)
    return;

  if (ends_excmd(*arg)) {
    /*
     * No argument: Clear all syntax items.
     */
    if (syncing)
      syntax_sync_clear();
    else {
      syntax_clear(curwin->w_s);
      if (curwin->w_s == &curwin->w_buffer->b_s) {
        do_unlet(S_LEN("b:current_syntax"), true);
      }
      do_unlet(S_LEN("w:current_syntax"), true);
    }
  } else {
    /*
     * Clear the group IDs that are in the argument.
     */
    while (!ends_excmd(*arg)) {
      arg_end = skiptowhite(arg);
      if (*arg == '@') {
        id = syn_scl_namen2id(arg + 1, (int)(arg_end - arg - 1));
        if (id == 0) {
          EMSG2(_("E391: No such syntax cluster: %s"), arg);
          break;
        } else {
          /*
           * We can't physically delete a cluster without changing
           * the IDs of other clusters, so we do the next best thing
           * and make it empty.
           */
          short scl_id = id - SYNID_CLUSTER;

          xfree(SYN_CLSTR(curwin->w_s)[scl_id].scl_list);
          SYN_CLSTR(curwin->w_s)[scl_id].scl_list = NULL;
        }
      } else {
        id = syn_namen2id(arg, (int)(arg_end - arg));
        if (id == 0) {
          EMSG2(_(e_nogroup), arg);
          break;
        } else
          syn_clear_one(id, syncing);
      }
      arg = skipwhite(arg_end);
    }
  }
  redraw_curbuf_later(SOME_VALID);
  syn_stack_free_all(curwin->w_s);              /* Need to recompute all syntax. */
}

/*
 * Clear one syntax group for the current buffer.
 */
static void syn_clear_one(int id, int syncing)
{
  synpat_T    *spp;

  /* Clear keywords only when not ":syn sync clear group-name" */
  if (!syncing) {
    syn_clear_keyword(id, &curwin->w_s->b_keywtab);
    syn_clear_keyword(id, &curwin->w_s->b_keywtab_ic);
  }

  /* clear the patterns for "id" */
  for (int idx = curwin->w_s->b_syn_patterns.ga_len; --idx >= 0; ) {
    spp = &(SYN_ITEMS(curwin->w_s)[idx]);
    if (spp->sp_syn.id != id || spp->sp_syncing != syncing)
      continue;
    syn_remove_pattern(curwin->w_s, idx);
  }
}

/*
 * Handle ":syntax on" command.
 */
static void syn_cmd_on(exarg_T *eap, int syncing)
{
  syn_cmd_onoff(eap, "syntax");
}

/*
 * Handle ":syntax enable" command.
 */
static void syn_cmd_enable(exarg_T *eap, int syncing)
{
  set_internal_string_var((char_u *)"syntax_cmd", (char_u *)"enable");
  syn_cmd_onoff(eap, "syntax");
  do_unlet(S_LEN("g:syntax_cmd"), true);
}

/*
 * Handle ":syntax reset" command.
 * It actually resets highlighting, not syntax.
 */
static void syn_cmd_reset(exarg_T *eap, int syncing)
{
  eap->nextcmd = check_nextcmd(eap->arg);
  if (!eap->skip) {
    set_internal_string_var((char_u *)"syntax_cmd", (char_u *)"reset");
    do_cmdline_cmd("runtime! syntax/syncolor.vim");
    do_unlet(S_LEN("g:syntax_cmd"), true);
  }
}

/*
 * Handle ":syntax manual" command.
 */
static void syn_cmd_manual(exarg_T *eap, int syncing)
{
  syn_cmd_onoff(eap, "manual");
}

/*
 * Handle ":syntax off" command.
 */
static void syn_cmd_off(exarg_T *eap, int syncing)
{
  syn_cmd_onoff(eap, "nosyntax");
}

static void syn_cmd_onoff(exarg_T *eap, char *name)
  FUNC_ATTR_NONNULL_ALL
{
  did_syntax_onoff = true;
  eap->nextcmd = check_nextcmd(eap->arg);
  if (!eap->skip) {
    char buf[100];
    memcpy(buf, "so ", 4);
    vim_snprintf(buf + 3, sizeof(buf) - 3, SYNTAX_FNAME, name);
    do_cmdline_cmd(buf);
  }
}

void syn_maybe_on(void)
{
  if (!did_syntax_onoff) {
    exarg_T ea;
    ea.arg = (char_u *)"";
    ea.skip = false;
    syn_cmd_onoff(&ea, "syntax");
  }
}

/*
 * Handle ":syntax [list]" command: list current syntax words.
 */
static void 
syn_cmd_list (
    exarg_T *eap,
    int syncing                        /* when TRUE: list syncing items */
)
{
  char_u      *arg = eap->arg;
  char_u      *arg_end;

  eap->nextcmd = find_nextcmd(arg);
  if (eap->skip)
    return;

  if (!syntax_present(curwin)) {
    MSG(_(msg_no_items));
    return;
  }

  if (syncing) {
    if (curwin->w_s->b_syn_sync_flags & SF_CCOMMENT) {
      MSG_PUTS(_("syncing on C-style comments"));
      syn_lines_msg();
      syn_match_msg();
      return;
    } else if (!(curwin->w_s->b_syn_sync_flags & SF_MATCH))   {
      if (curwin->w_s->b_syn_sync_minlines == 0)
        MSG_PUTS(_("no syncing"));
      else {
        MSG_PUTS(_("syncing starts "));
        msg_outnum(curwin->w_s->b_syn_sync_minlines);
        MSG_PUTS(_(" lines before top line"));
        syn_match_msg();
      }
      return;
    }
    MSG_PUTS_TITLE(_("\n--- Syntax sync items ---"));
    if (curwin->w_s->b_syn_sync_minlines > 0
        || curwin->w_s->b_syn_sync_maxlines > 0
        || curwin->w_s->b_syn_sync_linebreaks > 0) {
      MSG_PUTS(_("\nsyncing on items"));
      syn_lines_msg();
      syn_match_msg();
    }
  } else
    MSG_PUTS_TITLE(_("\n--- Syntax items ---"));
  if (ends_excmd(*arg)) {
    /*
     * No argument: List all group IDs and all syntax clusters.
     */
    for (int id = 1; id <= highlight_ga.ga_len && !got_int; ++id) {
      syn_list_one(id, syncing, FALSE);
    }
    for (int id = 0; id < curwin->w_s->b_syn_clusters.ga_len && !got_int; ++id) {
      syn_list_cluster(id);
    }
  } else {
    /*
     * List the group IDs and syntax clusters that are in the argument.
     */
    while (!ends_excmd(*arg) && !got_int) {
      arg_end = skiptowhite(arg);
      if (*arg == '@') {
        int id = syn_scl_namen2id(arg + 1, (int)(arg_end - arg - 1));
        if (id == 0)
          EMSG2(_("E392: No such syntax cluster: %s"), arg);
        else
          syn_list_cluster(id - SYNID_CLUSTER);
      } else {
        int id = syn_namen2id(arg, (int)(arg_end - arg));
        if (id == 0)
          EMSG2(_(e_nogroup), arg);
        else
          syn_list_one(id, syncing, TRUE);
      }
      arg = skipwhite(arg_end);
    }
  }
  eap->nextcmd = check_nextcmd(arg);
}

static void syn_lines_msg(void)
{
  if (curwin->w_s->b_syn_sync_maxlines > 0
      || curwin->w_s->b_syn_sync_minlines > 0) {
    MSG_PUTS("; ");
    if (curwin->w_s->b_syn_sync_minlines > 0) {
      MSG_PUTS(_("minimal "));
      msg_outnum(curwin->w_s->b_syn_sync_minlines);
      if (curwin->w_s->b_syn_sync_maxlines)
        MSG_PUTS(", ");
    }
    if (curwin->w_s->b_syn_sync_maxlines > 0) {
      MSG_PUTS(_("maximal "));
      msg_outnum(curwin->w_s->b_syn_sync_maxlines);
    }
    MSG_PUTS(_(" lines before top line"));
  }
}

static void syn_match_msg(void)
{
  if (curwin->w_s->b_syn_sync_linebreaks > 0) {
    MSG_PUTS(_("; match "));
    msg_outnum(curwin->w_s->b_syn_sync_linebreaks);
    MSG_PUTS(_(" line breaks"));
  }
}

static int last_matchgroup;


/*
 * List one syntax item, for ":syntax" or "syntax list syntax_name".
 */
static void 
syn_list_one (
    int id,
    int syncing,                        /* when TRUE: list syncing items */
    int link_only                      /* when TRUE; list link-only too */
)
{
  int attr;
  int did_header = FALSE;
  synpat_T    *spp;
  static struct name_list namelist1[] =
  {
    {HL_DISPLAY, "display"},
    {HL_CONTAINED, "contained"},
    {HL_ONELINE, "oneline"},
    {HL_KEEPEND, "keepend"},
    {HL_EXTEND, "extend"},
    {HL_EXCLUDENL, "excludenl"},
    {HL_TRANSP, "transparent"},
    {HL_FOLD, "fold"},
    {HL_CONCEAL, "conceal"},
    {HL_CONCEALENDS, "concealends"},
    {0, NULL}
  };
  static struct name_list namelist2[] =
  {
    {HL_SKIPWHITE, "skipwhite"},
    {HL_SKIPNL, "skipnl"},
    {HL_SKIPEMPTY, "skipempty"},
    {0, NULL}
  };

  attr = hl_attr(HLF_D);                /* highlight like directories */

  /* list the keywords for "id" */
  if (!syncing) {
    did_header = syn_list_keywords(id, &curwin->w_s->b_keywtab, FALSE, attr);
    did_header = syn_list_keywords(id, &curwin->w_s->b_keywtab_ic,
        did_header, attr);
  }

  /* list the patterns for "id" */
  for (int idx = 0; idx < curwin->w_s->b_syn_patterns.ga_len && !got_int; ++idx) {
    spp = &(SYN_ITEMS(curwin->w_s)[idx]);
    if (spp->sp_syn.id != id || spp->sp_syncing != syncing)
      continue;

    (void)syn_list_header(did_header, 999, id);
    did_header = TRUE;
    last_matchgroup = 0;
    if (spp->sp_type == SPTYPE_MATCH) {
      put_pattern("match", ' ', spp, attr);
      msg_putchar(' ');
    } else if (spp->sp_type == SPTYPE_START)   {
      while (SYN_ITEMS(curwin->w_s)[idx].sp_type == SPTYPE_START)
        put_pattern("start", '=', &SYN_ITEMS(curwin->w_s)[idx++], attr);
      if (SYN_ITEMS(curwin->w_s)[idx].sp_type == SPTYPE_SKIP)
        put_pattern("skip", '=', &SYN_ITEMS(curwin->w_s)[idx++], attr);
      while (idx < curwin->w_s->b_syn_patterns.ga_len
             && SYN_ITEMS(curwin->w_s)[idx].sp_type == SPTYPE_END)
        put_pattern("end", '=', &SYN_ITEMS(curwin->w_s)[idx++], attr);
      --idx;
      msg_putchar(' ');
    }
    syn_list_flags(namelist1, spp->sp_flags, attr);

    if (spp->sp_cont_list != NULL) {
      put_id_list("contains", spp->sp_cont_list, attr);
    }

    if (spp->sp_syn.cont_in_list != NULL) {
      put_id_list("containedin", spp->sp_syn.cont_in_list, attr);
    }

    if (spp->sp_next_list != NULL) {
      put_id_list("nextgroup", spp->sp_next_list, attr);
      syn_list_flags(namelist2, spp->sp_flags, attr);
    }
    if (spp->sp_flags & (HL_SYNC_HERE|HL_SYNC_THERE)) {
      if (spp->sp_flags & HL_SYNC_HERE) {
        msg_puts_attr("grouphere", attr);
      } else {
        msg_puts_attr("groupthere", attr);
      }
      msg_putchar(' ');
      if (spp->sp_sync_idx >= 0)
        msg_outtrans(HL_TABLE()[SYN_ITEMS(curwin->w_s)
                                [spp->sp_sync_idx].sp_syn.id - 1].sg_name);
      else
        MSG_PUTS("NONE");
      msg_putchar(' ');
    }
  }

  /* list the link, if there is one */
  if (HL_TABLE()[id - 1].sg_link && (did_header || link_only) && !got_int) {
    (void)syn_list_header(did_header, 999, id);
    msg_puts_attr("links to", attr);
    msg_putchar(' ');
    msg_outtrans(HL_TABLE()[HL_TABLE()[id - 1].sg_link - 1].sg_name);
  }
}

static void syn_list_flags(struct name_list *nlist, int flags, int attr)
{
  int i;

  for (i = 0; nlist[i].flag != 0; ++i)
    if (flags & nlist[i].flag) {
      msg_puts_attr(nlist[i].name, attr);
      msg_putchar(' ');
    }
}

/*
 * List one syntax cluster, for ":syntax" or "syntax list syntax_name".
 */
static void syn_list_cluster(int id)
{
  int endcol = 15;

  /* slight hack:  roughly duplicate the guts of syn_list_header() */
  msg_putchar('\n');
  msg_outtrans(SYN_CLSTR(curwin->w_s)[id].scl_name);

  if (msg_col >= endcol)        /* output at least one space */
    endcol = msg_col + 1;
  if (Columns <= endcol)        /* avoid hang for tiny window */
    endcol = Columns - 1;

  msg_advance(endcol);
  if (SYN_CLSTR(curwin->w_s)[id].scl_list != NULL) {
    put_id_list("cluster", SYN_CLSTR(curwin->w_s)[id].scl_list, hl_attr(HLF_D));
  } else {
    msg_puts_attr("cluster", hl_attr(HLF_D));
    msg_puts("=NONE");
  }
}

static void put_id_list(const char *name,
                        short *list,  // NOLINT(runtime/int)
                        int attr)
{
  short               *p;

  msg_puts_attr(name, attr);
  msg_putchar('=');
  for (p = list; *p; ++p) {
    if (*p >= SYNID_ALLBUT && *p < SYNID_TOP) {
      if (p[1]) {
        msg_puts("ALLBUT");
      } else {
        msg_puts("ALL");
      }
    } else if (*p >= SYNID_TOP && *p < SYNID_CONTAINED)   {
      msg_puts("TOP");
    } else if (*p >= SYNID_CONTAINED && *p < SYNID_CLUSTER)   {
      msg_puts("CONTAINED");
    } else if (*p >= SYNID_CLUSTER)   {
      short scl_id = *p - SYNID_CLUSTER;

      msg_putchar('@');
      msg_outtrans(SYN_CLSTR(curwin->w_s)[scl_id].scl_name);
    } else
      msg_outtrans(HL_TABLE()[*p - 1].sg_name);
    if (p[1])
      msg_putchar(',');
  }
  msg_putchar(' ');
}

static void put_pattern(char *s, int c, synpat_T *spp, int attr)
{
  long n;
  int mask;
  int first;
  static char *sepchars = "/+=-#@\"|'^&";
  int i;

  /* May have to write "matchgroup=group" */
  if (last_matchgroup != spp->sp_syn_match_id) {
    last_matchgroup = spp->sp_syn_match_id;
    msg_puts_attr("matchgroup", attr);
    msg_putchar('=');
    if (last_matchgroup == 0)
      msg_outtrans((char_u *)"NONE");
    else
      msg_outtrans(HL_TABLE()[last_matchgroup - 1].sg_name);
    msg_putchar(' ');
  }

  // Output the name of the pattern and an '=' or ' '.
  msg_puts_attr(s, attr);
  msg_putchar(c);

  /* output the pattern, in between a char that is not in the pattern */
  for (i = 0; vim_strchr(spp->sp_pattern, sepchars[i]) != NULL; )
    if (sepchars[++i] == NUL) {
      i = 0;            /* no good char found, just use the first one */
      break;
    }
  msg_putchar(sepchars[i]);
  msg_outtrans(spp->sp_pattern);
  msg_putchar(sepchars[i]);

  /* output any pattern options */
  first = TRUE;
  for (i = 0; i < SPO_COUNT; ++i) {
    mask = (1 << i);
    if (!(spp->sp_off_flags & (mask + (mask << SPO_COUNT)))) {
      continue;
    }
    if (!first) {
      msg_putchar(',');  // Separate with commas.
    }
    msg_puts(spo_name_tab[i]);
    n = spp->sp_offsets[i];
    if (i != SPO_LC_OFF) {
      if (spp->sp_off_flags & mask)
        msg_putchar('s');
      else
        msg_putchar('e');
      if (n > 0)
        msg_putchar('+');
    }
    if (n || i == SPO_LC_OFF)
      msg_outnum(n);
    first = FALSE;
  }
  msg_putchar(' ');
}

/*
 * List or clear the keywords for one syntax group.
 * Return TRUE if the header has been printed.
 */
static int 
syn_list_keywords (
    int id,
    hashtab_T *ht,
    int did_header,                         /* header has already been printed */
    int attr
)
{
  int outlen;
  hashitem_T  *hi;
  keyentry_T  *kp;
  int todo;
  int prev_contained = 0;
  short       *prev_next_list = NULL;
  short       *prev_cont_in_list = NULL;
  int prev_skipnl = 0;
  int prev_skipwhite = 0;
  int prev_skipempty = 0;

  /*
   * Unfortunately, this list of keywords is not sorted on alphabet but on
   * hash value...
   */
  todo = (int)ht->ht_used;
  for (hi = ht->ht_array; todo > 0 && !got_int; ++hi) {
    if (HASHITEM_EMPTY(hi)) {
      continue;
    }
    --todo;
    for (kp = HI2KE(hi); kp != NULL && !got_int; kp = kp->ke_next) {
      if (kp->k_syn.id == id) {
        if (prev_contained != (kp->flags & HL_CONTAINED)
            || prev_skipnl != (kp->flags & HL_SKIPNL)
            || prev_skipwhite != (kp->flags & HL_SKIPWHITE)
            || prev_skipempty != (kp->flags & HL_SKIPEMPTY)
            || prev_cont_in_list != kp->k_syn.cont_in_list
            || prev_next_list != kp->next_list)
          outlen = 9999;
        else
          outlen = (int)STRLEN(kp->keyword);
        /* output "contained" and "nextgroup" on each line */
        if (syn_list_header(did_header, outlen, id)) {
          prev_contained = 0;
          prev_next_list = NULL;
          prev_cont_in_list = NULL;
          prev_skipnl = 0;
          prev_skipwhite = 0;
          prev_skipempty = 0;
        }
        did_header = TRUE;
        if (prev_contained != (kp->flags & HL_CONTAINED)) {
          msg_puts_attr("contained", attr);
          msg_putchar(' ');
          prev_contained = (kp->flags & HL_CONTAINED);
        }
        if (kp->k_syn.cont_in_list != prev_cont_in_list) {
          put_id_list("containedin", kp->k_syn.cont_in_list, attr);
          msg_putchar(' ');
          prev_cont_in_list = kp->k_syn.cont_in_list;
        }
        if (kp->next_list != prev_next_list) {
          put_id_list("nextgroup", kp->next_list, attr);
          msg_putchar(' ');
          prev_next_list = kp->next_list;
          if (kp->flags & HL_SKIPNL) {
            msg_puts_attr("skipnl", attr);
            msg_putchar(' ');
            prev_skipnl = (kp->flags & HL_SKIPNL);
          }
          if (kp->flags & HL_SKIPWHITE) {
            msg_puts_attr("skipwhite", attr);
            msg_putchar(' ');
            prev_skipwhite = (kp->flags & HL_SKIPWHITE);
          }
          if (kp->flags & HL_SKIPEMPTY) {
            msg_puts_attr("skipempty", attr);
            msg_putchar(' ');
            prev_skipempty = (kp->flags & HL_SKIPEMPTY);
          }
        }
        msg_outtrans(kp->keyword);
      }
    }
  }

  return did_header;
}

static void syn_clear_keyword(int id, hashtab_T *ht)
{
  hashitem_T  *hi;
  keyentry_T  *kp;
  keyentry_T  *kp_prev;
  keyentry_T  *kp_next;
  int todo;

  hash_lock(ht);
  todo = (int)ht->ht_used;
  for (hi = ht->ht_array; todo > 0; ++hi) {
    if (HASHITEM_EMPTY(hi)) {
      continue;
    }
    --todo;
    kp_prev = NULL;
    for (kp = HI2KE(hi); kp != NULL; ) {
      if (kp->k_syn.id == id) {
        kp_next = kp->ke_next;
        if (kp_prev == NULL) {
          if (kp_next == NULL)
            hash_remove(ht, hi);
          else
            hi->hi_key = KE2HIKEY(kp_next);
        } else
          kp_prev->ke_next = kp_next;
        xfree(kp->next_list);
        xfree(kp->k_syn.cont_in_list);
        xfree(kp);
        kp = kp_next;
      } else {
        kp_prev = kp;
        kp = kp->ke_next;
      }
    }
  }
  hash_unlock(ht);
}

/*
 * Clear a whole keyword table.
 */
static void clear_keywtab(hashtab_T *ht)
{
  hashitem_T  *hi;
  int todo;
  keyentry_T  *kp;
  keyentry_T  *kp_next;

  todo = (int)ht->ht_used;
  for (hi = ht->ht_array; todo > 0; ++hi) {
    if (!HASHITEM_EMPTY(hi)) {
      --todo;
      for (kp = HI2KE(hi); kp != NULL; kp = kp_next) {
        kp_next = kp->ke_next;
        xfree(kp->next_list);
        xfree(kp->k_syn.cont_in_list);
        xfree(kp);
      }
    }
  }
  hash_clear(ht);
  hash_init(ht);
}

/// Add a keyword to the list of keywords.
///
/// @param name name of keyword
/// @param id group ID for this keyword
/// @param flags flags for this keyword
/// @param cont_in_list containedin for this keyword
/// @param next_list nextgroup for this keyword
static void add_keyword(char_u *name,
                        int id,
                        int flags,
                        short *cont_in_list,
                        short *next_list,
                        int conceal_char)
{
  char_u name_folded[MAXKEYWLEN + 1];
  char_u *name_ic = (curwin->w_s->b_syn_ic)
   ? str_foldcase(name, (int)STRLEN(name), name_folded, sizeof(name_folded))
   : name;

  keyentry_T *kp = xmalloc(sizeof(keyentry_T) + STRLEN(name_ic));
  STRCPY(kp->keyword, name_ic);
  kp->k_syn.id = id;
  kp->k_syn.inc_tag = current_syn_inc_tag;
  kp->flags = flags;
  kp->k_char = conceal_char;
  kp->k_syn.cont_in_list = copy_id_list(cont_in_list);
  if (cont_in_list != NULL) {
    curwin->w_s->b_syn_containedin = TRUE;
  }
  kp->next_list = copy_id_list(next_list);

  hash_T hash = hash_hash(kp->keyword);
  hashtab_T *ht = (curwin->w_s->b_syn_ic) ? &curwin->w_s->b_keywtab_ic
                                          : &curwin->w_s->b_keywtab;
  hashitem_T *hi = hash_lookup(ht, (const char *)kp->keyword,
                               STRLEN(kp->keyword), hash);

  // even though it looks like only the kp->keyword member is
  // being used here, vim uses some pointer trickery to get the orignal
  // struct again later by using knowledge of the offset of the keyword
  // field in the struct. See the definition of the HI2KE macro.
  if (HASHITEM_EMPTY(hi)) {
    // new keyword, add to hashtable
    kp->ke_next = NULL;
    hash_add_item(ht, hi, kp->keyword, hash);
  } else {
    // keyword already exists, prepend to list
    kp->ke_next = HI2KE(hi);
    hi->hi_key = KE2HIKEY(kp);
  }
}

/*
 * Get the start and end of the group name argument.
 * Return a pointer to the first argument.
 * Return NULL if the end of the command was found instead of further args.
 */
static char_u *
get_group_name (
    char_u *arg,               /* start of the argument */
    char_u **name_end         /* pointer to end of the name */
)
{
  char_u      *rest;

  *name_end = skiptowhite(arg);
  rest = skipwhite(*name_end);

  /*
   * Check if there are enough arguments.  The first argument may be a
   * pattern, where '|' is allowed, so only check for NUL.
   */
  if (ends_excmd(*arg) || *rest == NUL)
    return NULL;
  return rest;
}

/*
 * Check for syntax command option arguments.
 * This can be called at any place in the list of arguments, and just picks
 * out the arguments that are known.  Can be called several times in a row to
 * collect all options in between other arguments.
 * Return a pointer to the next argument (which isn't an option).
 * Return NULL for any error;
 */
static char_u *
get_syn_options (
    char_u *arg,                   /* next argument to be checked */
    syn_opt_arg_T *opt,                   /* various things */
    int *conceal_char
)
{
  char_u      *gname_start, *gname;
  int syn_id;
  int len;
  char        *p;
  int fidx;
  static struct flag {
    char    *name;
    int argtype;
    int flags;
  } flagtab[] = { {"cCoOnNtTaAiInNeEdD",      0,      HL_CONTAINED},
                  {"oOnNeElLiInNeE",          0,      HL_ONELINE},
                  {"kKeEeEpPeEnNdD",          0,      HL_KEEPEND},
                  {"eExXtTeEnNdD",            0,      HL_EXTEND},
                  {"eExXcClLuUdDeEnNlL",      0,      HL_EXCLUDENL},
                  {"tTrRaAnNsSpPaArReEnNtT",  0,      HL_TRANSP},
                  {"sSkKiIpPnNlL",            0,      HL_SKIPNL},
                  {"sSkKiIpPwWhHiItTeE",      0,      HL_SKIPWHITE},
                  {"sSkKiIpPeEmMpPtTyY",      0,      HL_SKIPEMPTY},
                  {"gGrRoOuUpPhHeErReE",      0,      HL_SYNC_HERE},
                  {"gGrRoOuUpPtThHeErReE",    0,      HL_SYNC_THERE},
                  {"dDiIsSpPlLaAyY",          0,      HL_DISPLAY},
                  {"fFoOlLdD",                0,      HL_FOLD},
                  {"cCoOnNcCeEaAlL",          0,      HL_CONCEAL},
                  {"cCoOnNcCeEaAlLeEnNdDsS",  0,      HL_CONCEALENDS},
                  {"cCcChHaArR",              11,     0},
                  {"cCoOnNtTaAiInNsS",        1,      0},
                  {"cCoOnNtTaAiInNeEdDiInN",  2,      0},
                  {"nNeExXtTgGrRoOuUpP",      3,      0},};
  static char *first_letters = "cCoOkKeEtTsSgGdDfFnN";

  if (arg == NULL)              /* already detected error */
    return NULL;

  if (curwin->w_s->b_syn_conceal)
    opt->flags |= HL_CONCEAL;

  for (;; ) {
    /*
     * This is used very often when a large number of keywords is defined.
     * Need to skip quickly when no option name is found.
     * Also avoid tolower(), it's slow.
     */
    if (strchr(first_letters, *arg) == NULL)
      break;

    for (fidx = ARRAY_SIZE(flagtab); --fidx >= 0; ) {
      p = flagtab[fidx].name;
      int i;
      for (i = 0, len = 0; p[i] != NUL; i += 2, ++len)
        if (arg[len] != p[i] && arg[len] != p[i + 1])
          break;
      if (p[i] == NUL && (ascii_iswhite(arg[len])
                          || (flagtab[fidx].argtype > 0
                              ? arg[len] == '='
                              : ends_excmd(arg[len])))) {
        if (opt->keyword
            && (flagtab[fidx].flags == HL_DISPLAY
                || flagtab[fidx].flags == HL_FOLD
                || flagtab[fidx].flags == HL_EXTEND))
          /* treat "display", "fold" and "extend" as a keyword */
          fidx = -1;
        break;
      }
    }
    if (fidx < 0)           /* no match found */
      break;

    if (flagtab[fidx].argtype == 1) {
      if (!opt->has_cont_list) {
        EMSG(_("E395: contains argument not accepted here"));
        return NULL;
      }
      if (get_id_list(&arg, 8, &opt->cont_list) == FAIL)
        return NULL;
    } else if (flagtab[fidx].argtype == 2)   {
      if (get_id_list(&arg, 11, &opt->cont_in_list) == FAIL)
        return NULL;
    } else if (flagtab[fidx].argtype == 3)   {
      if (get_id_list(&arg, 9, &opt->next_list) == FAIL)
        return NULL;
    } else if (flagtab[fidx].argtype == 11 && arg[5] == '=')   {
      /* cchar=? */
      if (has_mbyte) {
        *conceal_char = mb_ptr2char(arg + 6);
        arg += mb_ptr2len(arg + 6) - 1;
      } else {
        *conceal_char = arg[6];
      }
      if (!vim_isprintc_strict(*conceal_char)) {
        EMSG(_("E844: invalid cchar value"));
        return NULL;
      }
      arg = skipwhite(arg + 7);
    } else {
      opt->flags |= flagtab[fidx].flags;
      arg = skipwhite(arg + len);

      if (flagtab[fidx].flags == HL_SYNC_HERE
          || flagtab[fidx].flags == HL_SYNC_THERE) {
        if (opt->sync_idx == NULL) {
          EMSG(_("E393: group[t]here not accepted here"));
          return NULL;
        }
        gname_start = arg;
        arg = skiptowhite(arg);
        if (gname_start == arg)
          return NULL;
        gname = vim_strnsave(gname_start, (int)(arg - gname_start));
        if (STRCMP(gname, "NONE") == 0)
          *opt->sync_idx = NONE_IDX;
        else {
          syn_id = syn_name2id(gname);
          int i;
          for (i = curwin->w_s->b_syn_patterns.ga_len; --i >= 0; )
            if (SYN_ITEMS(curwin->w_s)[i].sp_syn.id == syn_id
                && SYN_ITEMS(curwin->w_s)[i].sp_type == SPTYPE_START) {
              *opt->sync_idx = i;
              break;
            }
          if (i < 0) {
            EMSG2(_("E394: Didn't find region item for %s"), gname);
            xfree(gname);
            return NULL;
          }
        }

        xfree(gname);
        arg = skipwhite(arg);
      } else if (flagtab[fidx].flags == HL_FOLD
                 && foldmethodIsSyntax(curwin))
        /* Need to update folds later. */
        foldUpdateAll(curwin);
    }
  }

  return arg;
}

/*
 * Adjustments to syntax item when declared in a ":syn include"'d file.
 * Set the contained flag, and if the item is not already contained, add it
 * to the specified top-level group, if any.
 */
static void syn_incl_toplevel(int id, int *flagsp)
{
  if ((*flagsp & HL_CONTAINED) || curwin->w_s->b_syn_topgrp == 0)
    return;
  *flagsp |= HL_CONTAINED;
  if (curwin->w_s->b_syn_topgrp >= SYNID_CLUSTER) {
    /* We have to alloc this, because syn_combine_list() will free it. */
    short *grp_list = xmalloc(2 * sizeof(short));
    int tlg_id = curwin->w_s->b_syn_topgrp - SYNID_CLUSTER;

    grp_list[0] = id;
    grp_list[1] = 0;
    syn_combine_list(&SYN_CLSTR(curwin->w_s)[tlg_id].scl_list, &grp_list,
        CLUSTER_ADD);
  }
}

/*
 * Handle ":syntax include [@{group-name}] filename" command.
 */
static void syn_cmd_include(exarg_T *eap, int syncing)
{
  char_u      *arg = eap->arg;
  int sgl_id = 1;
  char_u      *group_name_end;
  char_u      *rest;
  char_u      *errormsg = NULL;
  int prev_toplvl_grp;
  int prev_syn_inc_tag;
  int source = FALSE;

  eap->nextcmd = find_nextcmd(arg);
  if (eap->skip)
    return;

  if (arg[0] == '@') {
    ++arg;
    rest = get_group_name(arg, &group_name_end);
    if (rest == NULL) {
      EMSG((char_u *)_("E397: Filename required"));
      return;
    }
    sgl_id = syn_check_cluster(arg, (int)(group_name_end - arg));
    if (sgl_id == 0)
      return;
    /* separate_nextcmd() and expand_filename() depend on this */
    eap->arg = rest;
  }

  /*
   * Everything that's left, up to the next command, should be the
   * filename to include.
   */
  eap->argt |= (XFILE | NOSPC);
  separate_nextcmd(eap);
  if (*eap->arg == '<' || *eap->arg == '$' || path_is_absolute_path(eap->arg)) {
    /* For an absolute path, "$VIM/..." or "<sfile>.." we ":source" the
     * file.  Need to expand the file name first.  In other cases
     * ":runtime!" is used. */
    source = TRUE;
    if (expand_filename(eap, syn_cmdlinep, &errormsg) == FAIL) {
      if (errormsg != NULL)
        EMSG(errormsg);
      return;
    }
  }

  /*
   * Save and restore the existing top-level grouplist id and ":syn
   * include" tag around the actual inclusion.
   */
  if (running_syn_inc_tag >= MAX_SYN_INC_TAG) {
    EMSG((char_u *)_("E847: Too many syntax includes"));
    return;
  }
  prev_syn_inc_tag = current_syn_inc_tag;
  current_syn_inc_tag = ++running_syn_inc_tag;
  prev_toplvl_grp = curwin->w_s->b_syn_topgrp;
  curwin->w_s->b_syn_topgrp = sgl_id;
  if (source ? do_source(eap->arg, false, DOSO_NONE) == FAIL
             : source_runtime(eap->arg, DIP_ALL) == FAIL) {
    EMSG2(_(e_notopen), eap->arg);
  }
  curwin->w_s->b_syn_topgrp = prev_toplvl_grp;
  current_syn_inc_tag = prev_syn_inc_tag;
}

/*
 * Handle ":syntax keyword {group-name} [{option}] keyword .." command.
 */
static void syn_cmd_keyword(exarg_T *eap, int syncing)
{
  char_u      *arg = eap->arg;
  char_u      *group_name_end;
  int syn_id;
  char_u      *rest;
  char_u      *keyword_copy = NULL;
  char_u      *p;
  char_u      *kw;
  syn_opt_arg_T syn_opt_arg;
  int cnt;
  int conceal_char = NUL;

  rest = get_group_name(arg, &group_name_end);

  if (rest != NULL) {
    syn_id = syn_check_group(arg, (int)(group_name_end - arg));
    if (syn_id != 0) {
      // Allocate a buffer, for removing backslashes in the keyword.
      keyword_copy = xmalloc(STRLEN(rest) + 1);
    }
    if (keyword_copy != NULL) {
      syn_opt_arg.flags = 0;
      syn_opt_arg.keyword = true;
      syn_opt_arg.sync_idx = NULL;
      syn_opt_arg.has_cont_list = false;
      syn_opt_arg.cont_in_list = NULL;
      syn_opt_arg.next_list = NULL;

      // The options given apply to ALL keywords, so all options must be
      // found before keywords can be created.
      // 1: collect the options and copy the keywords to keyword_copy.
      cnt = 0;
      p = keyword_copy;
      for (; rest != NULL && !ends_excmd(*rest); rest = skipwhite(rest)) {
        rest = get_syn_options(rest, &syn_opt_arg, &conceal_char);
        if (rest == NULL || ends_excmd(*rest)) {
          break;
        }
        // Copy the keyword, removing backslashes, and add a NUL.
        while (*rest != NUL && !ascii_iswhite(*rest)) {
          if (*rest == '\\' && rest[1] != NUL) {
            rest++;
          }
          *p++ = *rest++;
        }
        *p++ = NUL;
        cnt++;
      }

      if (!eap->skip) {
        // Adjust flags for use of ":syn include".
        syn_incl_toplevel(syn_id, &syn_opt_arg.flags);

        // 2: Add an entry for each keyword.
        for (kw = keyword_copy; --cnt >= 0; kw += STRLEN(kw) + 1) {
          for (p = vim_strchr(kw, '[');; ) {
            if (p != NULL) {
              *p = NUL;
            }
            add_keyword(kw, syn_id, syn_opt_arg.flags,
                        syn_opt_arg.cont_in_list,
                        syn_opt_arg.next_list, conceal_char);
            if (p == NULL) {
              break;
            }
            if (p[1] == NUL) {
              emsgf(_("E789: Missing ']': %s"), kw);
              goto error;
            }
            if (p[1] == ']') {
              if (p[2] != NUL) {
                emsgf(_("E890: trailing char after ']': %s]%s"),
                      kw, &p[2]);
                goto error;
              }
              kw = p + 1;
              break;   // skip over the "]"
            }
            const int l = (*mb_ptr2len)(p + 1);

            memmove(p, p + 1, l);
            p += l;
          }
        }
      }

error:
      xfree(keyword_copy);
      xfree(syn_opt_arg.cont_in_list);
      xfree(syn_opt_arg.next_list);
    }
  }

  if (rest != NULL)
    eap->nextcmd = check_nextcmd(rest);
  else
    EMSG2(_(e_invarg2), arg);

  redraw_curbuf_later(SOME_VALID);
  syn_stack_free_all(curwin->w_s);              /* Need to recompute all syntax. */
}

/*
 * Handle ":syntax match {name} [{options}] {pattern} [{options}]".
 *
 * Also ":syntax sync match {name} [[grouphere | groupthere] {group-name}] .."
 */
static void 
syn_cmd_match (
    exarg_T *eap,
    int syncing                        /* TRUE for ":syntax sync match .. " */
)
{
  char_u      *arg = eap->arg;
  char_u      *group_name_end;
  char_u      *rest;
  synpat_T item;                /* the item found in the line */
  int syn_id;
  syn_opt_arg_T syn_opt_arg;
  int sync_idx = 0;
  int conceal_char = NUL;

  /* Isolate the group name, check for validity */
  rest = get_group_name(arg, &group_name_end);

  /* Get options before the pattern */
  syn_opt_arg.flags = 0;
  syn_opt_arg.keyword = FALSE;
  syn_opt_arg.sync_idx = syncing ? &sync_idx : NULL;
  syn_opt_arg.has_cont_list = TRUE;
  syn_opt_arg.cont_list = NULL;
  syn_opt_arg.cont_in_list = NULL;
  syn_opt_arg.next_list = NULL;
  rest = get_syn_options(rest, &syn_opt_arg, &conceal_char);

  /* get the pattern. */
  init_syn_patterns();
  memset(&item, 0, sizeof(item));
  rest = get_syn_pattern(rest, &item);
  if (vim_regcomp_had_eol() && !(syn_opt_arg.flags & HL_EXCLUDENL))
    syn_opt_arg.flags |= HL_HAS_EOL;

  /* Get options after the pattern */
  rest = get_syn_options(rest, &syn_opt_arg, &conceal_char);

  if (rest != NULL) {           /* all arguments are valid */
    /*
     * Check for trailing command and illegal trailing arguments.
     */
    eap->nextcmd = check_nextcmd(rest);
    if (!ends_excmd(*rest) || eap->skip)
      rest = NULL;
    else {
      if ((syn_id = syn_check_group(arg, (int)(group_name_end - arg))) != 0) {
        syn_incl_toplevel(syn_id, &syn_opt_arg.flags);
        /*
         * Store the pattern in the syn_items list
         */
        synpat_T *spp = GA_APPEND_VIA_PTR(synpat_T,
                                          &curwin->w_s->b_syn_patterns);
        *spp = item;
        spp->sp_syncing = syncing;
        spp->sp_type = SPTYPE_MATCH;
        spp->sp_syn.id = syn_id;
        spp->sp_syn.inc_tag = current_syn_inc_tag;
        spp->sp_flags = syn_opt_arg.flags;
        spp->sp_sync_idx = sync_idx;
        spp->sp_cont_list = syn_opt_arg.cont_list;
        spp->sp_syn.cont_in_list = syn_opt_arg.cont_in_list;
        spp->sp_cchar = conceal_char;
        if (syn_opt_arg.cont_in_list != NULL)
          curwin->w_s->b_syn_containedin = TRUE;
        spp->sp_next_list = syn_opt_arg.next_list;

        /* remember that we found a match for syncing on */
        if (syn_opt_arg.flags & (HL_SYNC_HERE|HL_SYNC_THERE))
          curwin->w_s->b_syn_sync_flags |= SF_MATCH;
        if (syn_opt_arg.flags & HL_FOLD)
          ++curwin->w_s->b_syn_folditems;

        redraw_curbuf_later(SOME_VALID);
        syn_stack_free_all(curwin->w_s);          /* Need to recompute all syntax. */
        return;           /* don't free the progs and patterns now */
      }
    }
  }

  /*
   * Something failed, free the allocated memory.
   */
  vim_regfree(item.sp_prog);
  xfree(item.sp_pattern);
  xfree(syn_opt_arg.cont_list);
  xfree(syn_opt_arg.cont_in_list);
  xfree(syn_opt_arg.next_list);

  if (rest == NULL)
    EMSG2(_(e_invarg2), arg);
}

/*
 * Handle ":syntax region {group-name} [matchgroup={group-name}]
 *		start {start} .. [skip {skip}] end {end} .. [{options}]".
 */
static void 
syn_cmd_region (
    exarg_T *eap,
    int syncing                        /* TRUE for ":syntax sync region .." */
)
{
  char_u              *arg = eap->arg;
  char_u              *group_name_end;
  char_u              *rest;                    /* next arg, NULL on error */
  char_u              *key_end;
  char_u              *key = NULL;
  char_u              *p;
  int item;
#define ITEM_START          0
#define ITEM_SKIP           1
#define ITEM_END            2
#define ITEM_MATCHGROUP     3
  struct pat_ptr {
    synpat_T        *pp_synp;                   /* pointer to syn_pattern */
    int pp_matchgroup_id;                       /* matchgroup ID */
    struct pat_ptr  *pp_next;                   /* pointer to next pat_ptr */
  }                   *(pat_ptrs[3]);
  /* patterns found in the line */
  struct pat_ptr      *ppp;
  struct pat_ptr      *ppp_next;
  int pat_count = 0;                            /* nr of syn_patterns found */
  int syn_id;
  int matchgroup_id = 0;
  int not_enough = FALSE;                       /* not enough arguments */
  int illegal = FALSE;                          /* illegal arguments */
  int success = FALSE;
  syn_opt_arg_T syn_opt_arg;
  int conceal_char = NUL;

  /* Isolate the group name, check for validity */
  rest = get_group_name(arg, &group_name_end);

  pat_ptrs[0] = NULL;
  pat_ptrs[1] = NULL;
  pat_ptrs[2] = NULL;

  init_syn_patterns();

  syn_opt_arg.flags = 0;
  syn_opt_arg.keyword = FALSE;
  syn_opt_arg.sync_idx = NULL;
  syn_opt_arg.has_cont_list = TRUE;
  syn_opt_arg.cont_list = NULL;
  syn_opt_arg.cont_in_list = NULL;
  syn_opt_arg.next_list = NULL;

  /*
   * get the options, patterns and matchgroup.
   */
  while (rest != NULL && !ends_excmd(*rest)) {
    /* Check for option arguments */
    rest = get_syn_options(rest, &syn_opt_arg, &conceal_char);
    if (rest == NULL || ends_excmd(*rest))
      break;

    /* must be a pattern or matchgroup then */
    key_end = rest;
    while (*key_end && !ascii_iswhite(*key_end) && *key_end != '=')
      ++key_end;
    xfree(key);
    key = vim_strnsave_up(rest, (int)(key_end - rest));
    if (STRCMP(key, "MATCHGROUP") == 0)
      item = ITEM_MATCHGROUP;
    else if (STRCMP(key, "START") == 0)
      item = ITEM_START;
    else if (STRCMP(key, "END") == 0)
      item = ITEM_END;
    else if (STRCMP(key, "SKIP") == 0) {
      if (pat_ptrs[ITEM_SKIP] != NULL) {        /* one skip pattern allowed */
        illegal = TRUE;
        break;
      }
      item = ITEM_SKIP;
    } else
      break;
    rest = skipwhite(key_end);
    if (*rest != '=') {
      rest = NULL;
      EMSG2(_("E398: Missing '=': %s"), arg);
      break;
    }
    rest = skipwhite(rest + 1);
    if (*rest == NUL) {
      not_enough = TRUE;
      break;
    }

    if (item == ITEM_MATCHGROUP) {
      p = skiptowhite(rest);
      if ((p - rest == 4 && STRNCMP(rest, "NONE", 4) == 0) || eap->skip)
        matchgroup_id = 0;
      else {
        matchgroup_id = syn_check_group(rest, (int)(p - rest));
        if (matchgroup_id == 0) {
          illegal = TRUE;
          break;
        }
      }
      rest = skipwhite(p);
    } else {
      /*
       * Allocate room for a syn_pattern, and link it in the list of
       * syn_patterns for this item, at the start (because the list is
       * used from end to start).
       */
      ppp = xmalloc(sizeof(struct pat_ptr));
      ppp->pp_next = pat_ptrs[item];
      pat_ptrs[item] = ppp;
      ppp->pp_synp = xcalloc(1, sizeof(synpat_T));

      /*
       * Get the syntax pattern and the following offset(s).
       */
      /* Enable the appropriate \z specials. */
      if (item == ITEM_START)
        reg_do_extmatch = REX_SET;
      else if (item == ITEM_SKIP || item == ITEM_END)
        reg_do_extmatch = REX_USE;
      rest = get_syn_pattern(rest, ppp->pp_synp);
      reg_do_extmatch = 0;
      if (item == ITEM_END && vim_regcomp_had_eol()
          && !(syn_opt_arg.flags & HL_EXCLUDENL))
        ppp->pp_synp->sp_flags |= HL_HAS_EOL;
      ppp->pp_matchgroup_id = matchgroup_id;
      ++pat_count;
    }
  }
  xfree(key);
  if (illegal || not_enough)
    rest = NULL;

  // Must have a "start" and "end" pattern.
  if (rest != NULL && (pat_ptrs[ITEM_START] == NULL
                       || pat_ptrs[ITEM_END] == NULL)) {
    not_enough = true;
    rest = NULL;
  }

  if (rest != NULL) {
    /*
     * Check for trailing garbage or command.
     * If OK, add the item.
     */
    eap->nextcmd = check_nextcmd(rest);
    if (!ends_excmd(*rest) || eap->skip)
      rest = NULL;
    else {
      ga_grow(&(curwin->w_s->b_syn_patterns), pat_count);
      if ((syn_id = syn_check_group(arg, (int)(group_name_end - arg))) != 0) {
        syn_incl_toplevel(syn_id, &syn_opt_arg.flags);
        /*
         * Store the start/skip/end in the syn_items list
         */
        int idx = curwin->w_s->b_syn_patterns.ga_len;
        for (item = ITEM_START; item <= ITEM_END; ++item) {
          for (ppp = pat_ptrs[item]; ppp != NULL; ppp = ppp->pp_next) {
            SYN_ITEMS(curwin->w_s)[idx] = *(ppp->pp_synp);
            SYN_ITEMS(curwin->w_s)[idx].sp_syncing = syncing;
            SYN_ITEMS(curwin->w_s)[idx].sp_type =
              (item == ITEM_START) ? SPTYPE_START :
              (item == ITEM_SKIP) ? SPTYPE_SKIP : SPTYPE_END;
            SYN_ITEMS(curwin->w_s)[idx].sp_flags |= syn_opt_arg.flags;
            SYN_ITEMS(curwin->w_s)[idx].sp_syn.id = syn_id;
            SYN_ITEMS(curwin->w_s)[idx].sp_syn.inc_tag =
              current_syn_inc_tag;
            SYN_ITEMS(curwin->w_s)[idx].sp_syn_match_id =
              ppp->pp_matchgroup_id;
            SYN_ITEMS(curwin->w_s)[idx].sp_cchar = conceal_char;
            if (item == ITEM_START) {
              SYN_ITEMS(curwin->w_s)[idx].sp_cont_list =
                syn_opt_arg.cont_list;
              SYN_ITEMS(curwin->w_s)[idx].sp_syn.cont_in_list =
                syn_opt_arg.cont_in_list;
              if (syn_opt_arg.cont_in_list != NULL)
                curwin->w_s->b_syn_containedin = TRUE;
              SYN_ITEMS(curwin->w_s)[idx].sp_next_list =
                syn_opt_arg.next_list;
            }
            ++curwin->w_s->b_syn_patterns.ga_len;
            ++idx;
            if (syn_opt_arg.flags & HL_FOLD)
              ++curwin->w_s->b_syn_folditems;
          }
        }

        redraw_curbuf_later(SOME_VALID);
        syn_stack_free_all(curwin->w_s);          /* Need to recompute all syntax. */
        success = TRUE;               /* don't free the progs and patterns now */
      }
    }
  }

  /*
   * Free the allocated memory.
   */
  for (item = ITEM_START; item <= ITEM_END; ++item)
    for (ppp = pat_ptrs[item]; ppp != NULL; ppp = ppp_next) {
      if (!success) {
        vim_regfree(ppp->pp_synp->sp_prog);
        xfree(ppp->pp_synp->sp_pattern);
      }
      xfree(ppp->pp_synp);
      ppp_next = ppp->pp_next;
      xfree(ppp);
    }

  if (!success) {
    xfree(syn_opt_arg.cont_list);
    xfree(syn_opt_arg.cont_in_list);
    xfree(syn_opt_arg.next_list);
    if (not_enough)
      EMSG2(_("E399: Not enough arguments: syntax region %s"), arg);
    else if (illegal || rest == NULL)
      EMSG2(_(e_invarg2), arg);
  }
}

/*
 * A simple syntax group ID comparison function suitable for use in qsort()
 */
static int syn_compare_stub(const void *v1, const void *v2)
{
  const short *s1 = v1;
  const short *s2 = v2;

  return *s1 > *s2 ? 1 : *s1 < *s2 ? -1 : 0;
}

/*
 * Combines lists of syntax clusters.
 * *clstr1 and *clstr2 must both be allocated memory; they will be consumed.
 */
static void syn_combine_list(short **clstr1, short **clstr2, int list_op)
{
  int count1 = 0;
  int count2 = 0;
  short       *g1;
  short       *g2;
  short       *clstr = NULL;
  int count;
  int round;

  /*
   * Handle degenerate cases.
   */
  if (*clstr2 == NULL)
    return;
  if (*clstr1 == NULL || list_op == CLUSTER_REPLACE) {
    if (list_op == CLUSTER_REPLACE)
      xfree(*clstr1);
    if (list_op == CLUSTER_REPLACE || list_op == CLUSTER_ADD)
      *clstr1 = *clstr2;
    else
      xfree(*clstr2);
    return;
  }

  for (g1 = *clstr1; *g1; g1++)
    ++count1;
  for (g2 = *clstr2; *g2; g2++)
    ++count2;

  /*
   * For speed purposes, sort both lists.
   */
  qsort(*clstr1, (size_t)count1, sizeof(short), syn_compare_stub);
  qsort(*clstr2, (size_t)count2, sizeof(short), syn_compare_stub);

  /*
   * We proceed in two passes; in round 1, we count the elements to place
   * in the new list, and in round 2, we allocate and populate the new
   * list.  For speed, we use a mergesort-like method, adding the smaller
   * of the current elements in each list to the new list.
   */
  for (round = 1; round <= 2; round++) {
    g1 = *clstr1;
    g2 = *clstr2;
    count = 0;

    /*
     * First, loop through the lists until one of them is empty.
     */
    while (*g1 && *g2) {
      /*
       * We always want to add from the first list.
       */
      if (*g1 < *g2) {
        if (round == 2)
          clstr[count] = *g1;
        count++;
        g1++;
        continue;
      }
      /*
       * We only want to add from the second list if we're adding the
       * lists.
       */
      if (list_op == CLUSTER_ADD) {
        if (round == 2)
          clstr[count] = *g2;
        count++;
      }
      if (*g1 == *g2)
        g1++;
      g2++;
    }

    /*
     * Now add the leftovers from whichever list didn't get finished
     * first.  As before, we only want to add from the second list if
     * we're adding the lists.
     */
    for (; *g1; g1++, count++)
      if (round == 2)
        clstr[count] = *g1;
    if (list_op == CLUSTER_ADD)
      for (; *g2; g2++, count++)
        if (round == 2)
          clstr[count] = *g2;

    if (round == 1) {
      /*
       * If the group ended up empty, we don't need to allocate any
       * space for it.
       */
      if (count == 0) {
        clstr = NULL;
        break;
      }
      clstr = xmalloc((count + 1) * sizeof(short));
      clstr[count] = 0;
    }
  }

  /*
   * Finally, put the new list in place.
   */
  xfree(*clstr1);
  xfree(*clstr2);
  *clstr1 = clstr;
}

/*
 * Lookup a syntax cluster name and return it's ID.
 * If it is not found, 0 is returned.
 */
static int syn_scl_name2id(char_u *name)
{
  // Avoid using stricmp() too much, it's slow on some systems
  char_u *name_u = vim_strsave_up(name);
  int i;
  for (i = curwin->w_s->b_syn_clusters.ga_len; --i >= 0; ) {
    if (SYN_CLSTR(curwin->w_s)[i].scl_name_u != NULL
        && STRCMP(name_u, SYN_CLSTR(curwin->w_s)[i].scl_name_u) == 0) {
      break;
    }
  }
  xfree(name_u);
  return i < 0 ? 0 : i + SYNID_CLUSTER;
}

/*
 * Like syn_scl_name2id(), but take a pointer + length argument.
 */
static int syn_scl_namen2id(char_u *linep, int len)
{
  char_u *name = vim_strnsave(linep, len);
  int id = syn_scl_name2id(name);
  xfree(name);

  return id;
}

/*
 * Find syntax cluster name in the table and return it's ID.
 * The argument is a pointer to the name and the length of the name.
 * If it doesn't exist yet, a new entry is created.
 * Return 0 for failure.
 */
static int syn_check_cluster(char_u *pp, int len)
{
  int id;
  char_u      *name;

  name = vim_strnsave(pp, len);

  id = syn_scl_name2id(name);
  if (id == 0)                          /* doesn't exist yet */
    id = syn_add_cluster(name);
  else
    xfree(name);
  return id;
}

/*
 * Add new syntax cluster and return it's ID.
 * "name" must be an allocated string, it will be consumed.
 * Return 0 for failure.
 */
static int syn_add_cluster(char_u *name)
{
  /*
   * First call for this growarray: init growing array.
   */
  if (curwin->w_s->b_syn_clusters.ga_data == NULL) {
    curwin->w_s->b_syn_clusters.ga_itemsize = sizeof(syn_cluster_T);
    ga_set_growsize(&curwin->w_s->b_syn_clusters, 10);
  }

  int len = curwin->w_s->b_syn_clusters.ga_len;
  if (len >= MAX_CLUSTER_ID) {
    EMSG((char_u *)_("E848: Too many syntax clusters"));
    xfree(name);
    return 0;
  }

  syn_cluster_T *scp = GA_APPEND_VIA_PTR(syn_cluster_T,
                                         &curwin->w_s->b_syn_clusters);
  memset(scp, 0, sizeof(*scp));
  scp->scl_name = name;
  scp->scl_name_u = vim_strsave_up(name);
  scp->scl_list = NULL;

  if (STRICMP(name, "Spell") == 0)
    curwin->w_s->b_spell_cluster_id = len + SYNID_CLUSTER;
  if (STRICMP(name, "NoSpell") == 0)
    curwin->w_s->b_nospell_cluster_id = len + SYNID_CLUSTER;

  return len + SYNID_CLUSTER;
}

/*
 * Handle ":syntax cluster {cluster-name} [contains={groupname},..]
 *		[add={groupname},..] [remove={groupname},..]".
 */
static void syn_cmd_cluster(exarg_T *eap, int syncing)
{
  char_u      *arg = eap->arg;
  char_u      *group_name_end;
  char_u      *rest;
  int scl_id;
  short       *clstr_list;
  int got_clstr = FALSE;
  int opt_len;
  int list_op;

  eap->nextcmd = find_nextcmd(arg);
  if (eap->skip)
    return;

  rest = get_group_name(arg, &group_name_end);

  if (rest != NULL) {
    scl_id = syn_check_cluster(arg, (int)(group_name_end - arg));
    if (scl_id == 0)
      return;
    scl_id -= SYNID_CLUSTER;

    for (;; ) {
      if (STRNICMP(rest, "add", 3) == 0
          && (ascii_iswhite(rest[3]) || rest[3] == '=')) {
        opt_len = 3;
        list_op = CLUSTER_ADD;
      } else if (STRNICMP(rest, "remove", 6) == 0
                 && (ascii_iswhite(rest[6]) || rest[6] == '=')) {
        opt_len = 6;
        list_op = CLUSTER_SUBTRACT;
      } else if (STRNICMP(rest, "contains", 8) == 0
                 && (ascii_iswhite(rest[8]) || rest[8] == '=')) {
        opt_len = 8;
        list_op = CLUSTER_REPLACE;
      } else
        break;

      clstr_list = NULL;
      if (get_id_list(&rest, opt_len, &clstr_list) == FAIL) {
        EMSG2(_(e_invarg2), rest);
        break;
      }
      syn_combine_list(&SYN_CLSTR(curwin->w_s)[scl_id].scl_list,
          &clstr_list, list_op);
      got_clstr = TRUE;
    }

    if (got_clstr) {
      redraw_curbuf_later(SOME_VALID);
      syn_stack_free_all(curwin->w_s);          /* Need to recompute all. */
    }
  }

  if (!got_clstr)
    EMSG(_("E400: No cluster specified"));
  if (rest == NULL || !ends_excmd(*rest))
    EMSG2(_(e_invarg2), arg);
}

/*
 * On first call for current buffer: Init growing array.
 */
static void init_syn_patterns(void)
{
  curwin->w_s->b_syn_patterns.ga_itemsize = sizeof(synpat_T);
  ga_set_growsize(&curwin->w_s->b_syn_patterns, 10);
}

/*
 * Get one pattern for a ":syntax match" or ":syntax region" command.
 * Stores the pattern and program in a synpat_T.
 * Returns a pointer to the next argument, or NULL in case of an error.
 */
static char_u *get_syn_pattern(char_u *arg, synpat_T *ci)
{
  char_u      *end;
  int         *p;
  int idx;
  char_u      *cpo_save;

  // need at least three chars
  if (arg == NULL || arg[0] == NUL || arg[1] == NUL || arg[2] == NUL) {
    return NULL;
  }

  end = skip_regexp(arg + 1, *arg, TRUE, NULL);
  if (*end != *arg) {                       /* end delimiter not found */
    EMSG2(_("E401: Pattern delimiter not found: %s"), arg);
    return NULL;
  }
  /* store the pattern and compiled regexp program */
  ci->sp_pattern = vim_strnsave(arg + 1, (int)(end - arg - 1));

  /* Make 'cpoptions' empty, to avoid the 'l' flag */
  cpo_save = p_cpo;
  p_cpo = (char_u *)"";
  ci->sp_prog = vim_regcomp(ci->sp_pattern, RE_MAGIC);
  p_cpo = cpo_save;

  if (ci->sp_prog == NULL)
    return NULL;
  ci->sp_ic = curwin->w_s->b_syn_ic;
  syn_clear_time(&ci->sp_time);

  /*
   * Check for a match, highlight or region offset.
   */
  ++end;
  do {
    for (idx = SPO_COUNT; --idx >= 0; )
      if (STRNCMP(end, spo_name_tab[idx], 3) == 0)
        break;
    if (idx >= 0) {
      p = &(ci->sp_offsets[idx]);
      if (idx != SPO_LC_OFF)
        switch (end[3]) {
        case 's':   break;
        case 'b':   break;
        case 'e':   idx += SPO_COUNT; break;
        default:    idx = -1; break;
        }
      if (idx >= 0) {
        ci->sp_off_flags |= (1 << idx);
        if (idx == SPO_LC_OFF) {            /* lc=99 */
          end += 3;
          *p = getdigits_int(&end);

          /* "lc=" offset automatically sets "ms=" offset */
          if (!(ci->sp_off_flags & (1 << SPO_MS_OFF))) {
            ci->sp_off_flags |= (1 << SPO_MS_OFF);
            ci->sp_offsets[SPO_MS_OFF] = *p;
          }
        } else {                          /* yy=x+99 */
          end += 4;
          if (*end == '+') {
            ++end;
            *p = getdigits_int(&end);                       /* positive offset */
          } else if (*end == '-')   {
            ++end;
            *p = -getdigits_int(&end);                      /* negative offset */
          }
        }
        if (*end != ',')
          break;
        ++end;
      }
    }
  } while (idx >= 0);

  if (!ends_excmd(*end) && !ascii_iswhite(*end)) {
    EMSG2(_("E402: Garbage after pattern: %s"), arg);
    return NULL;
  }
  return skipwhite(end);
}

/*
 * Handle ":syntax sync .." command.
 */
static void syn_cmd_sync(exarg_T *eap, int syncing)
{
  char_u      *arg_start = eap->arg;
  char_u      *arg_end;
  char_u      *key = NULL;
  char_u      *next_arg;
  int illegal = FALSE;
  int finished = FALSE;
  long n;
  char_u      *cpo_save;

  if (ends_excmd(*arg_start)) {
    syn_cmd_list(eap, TRUE);
    return;
  }

  while (!ends_excmd(*arg_start)) {
    arg_end = skiptowhite(arg_start);
    next_arg = skipwhite(arg_end);
    xfree(key);
    key = vim_strnsave_up(arg_start, (int)(arg_end - arg_start));
    if (STRCMP(key, "CCOMMENT") == 0) {
      if (!eap->skip)
        curwin->w_s->b_syn_sync_flags |= SF_CCOMMENT;
      if (!ends_excmd(*next_arg)) {
        arg_end = skiptowhite(next_arg);
        if (!eap->skip)
          curwin->w_s->b_syn_sync_id = syn_check_group(next_arg,
              (int)(arg_end - next_arg));
        next_arg = skipwhite(arg_end);
      } else if (!eap->skip)
        curwin->w_s->b_syn_sync_id = syn_name2id((char_u *)"Comment");
    } else if (  STRNCMP(key, "LINES", 5) == 0
                 || STRNCMP(key, "MINLINES", 8) == 0
                 || STRNCMP(key, "MAXLINES", 8) == 0
                 || STRNCMP(key, "LINEBREAKS", 10) == 0) {
      if (key[4] == 'S')
        arg_end = key + 6;
      else if (key[0] == 'L')
        arg_end = key + 11;
      else
        arg_end = key + 9;
      if (arg_end[-1] != '=' || !ascii_isdigit(*arg_end)) {
        illegal = TRUE;
        break;
      }
      n = getdigits_long(&arg_end);
      if (!eap->skip) {
        if (key[4] == 'B')
          curwin->w_s->b_syn_sync_linebreaks = n;
        else if (key[1] == 'A')
          curwin->w_s->b_syn_sync_maxlines = n;
        else
          curwin->w_s->b_syn_sync_minlines = n;
      }
    } else if (STRCMP(key, "FROMSTART") == 0)   {
      if (!eap->skip) {
        curwin->w_s->b_syn_sync_minlines = MAXLNUM;
        curwin->w_s->b_syn_sync_maxlines = 0;
      }
    } else if (STRCMP(key, "LINECONT") == 0)   {
      if (*next_arg == NUL) {  // missing pattern
        illegal = true;
        break;
      }
      if (curwin->w_s->b_syn_linecont_pat != NULL) {
        EMSG(_("E403: syntax sync: line continuations pattern specified twice"));
        finished = TRUE;
        break;
      }
      arg_end = skip_regexp(next_arg + 1, *next_arg, TRUE, NULL);
      if (*arg_end != *next_arg) {          /* end delimiter not found */
        illegal = TRUE;
        break;
      }

      if (!eap->skip) {
        /* store the pattern and compiled regexp program */
        curwin->w_s->b_syn_linecont_pat =
          vim_strnsave(next_arg + 1, (int)(arg_end - next_arg - 1));
        curwin->w_s->b_syn_linecont_ic = curwin->w_s->b_syn_ic;

        /* Make 'cpoptions' empty, to avoid the 'l' flag */
        cpo_save = p_cpo;
        p_cpo = (char_u *)"";
        curwin->w_s->b_syn_linecont_prog =
          vim_regcomp(curwin->w_s->b_syn_linecont_pat, RE_MAGIC);
        p_cpo = cpo_save;
        syn_clear_time(&curwin->w_s->b_syn_linecont_time);

        if (curwin->w_s->b_syn_linecont_prog == NULL) {
          xfree(curwin->w_s->b_syn_linecont_pat);
          curwin->w_s->b_syn_linecont_pat = NULL;
          finished = TRUE;
          break;
        }
      }
      next_arg = skipwhite(arg_end + 1);
    } else {
      eap->arg = next_arg;
      if (STRCMP(key, "MATCH") == 0)
        syn_cmd_match(eap, TRUE);
      else if (STRCMP(key, "REGION") == 0)
        syn_cmd_region(eap, TRUE);
      else if (STRCMP(key, "CLEAR") == 0)
        syn_cmd_clear(eap, TRUE);
      else
        illegal = TRUE;
      finished = TRUE;
      break;
    }
    arg_start = next_arg;
  }
  xfree(key);
  if (illegal)
    EMSG2(_("E404: Illegal arguments: %s"), arg_start);
  else if (!finished) {
    eap->nextcmd = check_nextcmd(arg_start);
    redraw_curbuf_later(SOME_VALID);
    syn_stack_free_all(curwin->w_s);            /* Need to recompute all syntax. */
  }
}

/*
 * Convert a line of highlight group names into a list of group ID numbers.
 * "arg" should point to the "contains" or "nextgroup" keyword.
 * "arg" is advanced to after the last group name.
 * Careful: the argument is modified (NULs added).
 * returns FAIL for some error, OK for success.
 */
static int 
get_id_list (
    char_u **arg,
    int keylen,                     /* length of keyword */
    short **list             /* where to store the resulting list, if not
                                   NULL, the list is silently skipped! */
)
{
  char_u      *p = NULL;
  char_u      *end;
  int round;
  int count;
  int total_count = 0;
  short       *retval = NULL;
  char_u      *name;
  regmatch_T regmatch;
  int id;
  int failed = FALSE;

  /*
   * We parse the list twice:
   * round == 1: count the number of items, allocate the array.
   * round == 2: fill the array with the items.
   * In round 1 new groups may be added, causing the number of items to
   * grow when a regexp is used.  In that case round 1 is done once again.
   */
  for (round = 1; round <= 2; ++round) {
    /*
     * skip "contains"
     */
    p = skipwhite(*arg + keylen);
    if (*p != '=') {
      EMSG2(_("E405: Missing equal sign: %s"), *arg);
      break;
    }
    p = skipwhite(p + 1);
    if (ends_excmd(*p)) {
      EMSG2(_("E406: Empty argument: %s"), *arg);
      break;
    }

    /*
     * parse the arguments after "contains"
     */
    count = 0;
    do {
      for (end = p; *end && !ascii_iswhite(*end) && *end != ','; ++end)
        ;
      name = xmalloc((int)(end - p + 3));             /* leave room for "^$" */
      STRLCPY(name + 1, p, end - p + 1);
      if (       STRCMP(name + 1, "ALLBUT") == 0
                 || STRCMP(name + 1, "ALL") == 0
                 || STRCMP(name + 1, "TOP") == 0
                 || STRCMP(name + 1, "CONTAINED") == 0) {
        if (TOUPPER_ASC(**arg) != 'C') {
          EMSG2(_("E407: %s not allowed here"), name + 1);
          failed = TRUE;
          xfree(name);
          break;
        }
        if (count != 0) {
          EMSG2(_("E408: %s must be first in contains list"), name + 1);
          failed = TRUE;
          xfree(name);
          break;
        }
        if (name[1] == 'A')
          id = SYNID_ALLBUT;
        else if (name[1] == 'T')
          id = SYNID_TOP;
        else
          id = SYNID_CONTAINED;
        id += current_syn_inc_tag;
      } else if (name[1] == '@')   {
        id = syn_check_cluster(name + 2, (int)(end - p - 1));
      } else {
        /*
         * Handle full group name.
         */
        if (vim_strpbrk(name + 1, (char_u *)"\\.*^$~[") == NULL)
          id = syn_check_group(name + 1, (int)(end - p));
        else {
          /*
           * Handle match of regexp with group names.
           */
          *name = '^';
          STRCAT(name, "$");
          regmatch.regprog = vim_regcomp(name, RE_MAGIC);
          if (regmatch.regprog == NULL) {
            failed = TRUE;
            xfree(name);
            break;
          }

          regmatch.rm_ic = TRUE;
          id = 0;
          for (int i = highlight_ga.ga_len; --i >= 0; ) {
            if (vim_regexec(&regmatch, HL_TABLE()[i].sg_name, (colnr_T)0)) {
              if (round == 2) {
                /* Got more items than expected; can happen
                 * when adding items that match:
                 * "contains=a.*b,axb".
                 * Go back to first round */
                if (count >= total_count) {
                  xfree(retval);
                  round = 1;
                } else
                  retval[count] = i + 1;
              }
              ++count;
              id = -1;                      /* remember that we found one */
            }
          }
          vim_regfree(regmatch.regprog);
        }
      }
      xfree(name);
      if (id == 0) {
        EMSG2(_("E409: Unknown group name: %s"), p);
        failed = TRUE;
        break;
      }
      if (id > 0) {
        if (round == 2) {
          /* Got more items than expected, go back to first round */
          if (count >= total_count) {
            xfree(retval);
            round = 1;
          } else
            retval[count] = id;
        }
        ++count;
      }
      p = skipwhite(end);
      if (*p != ',')
        break;
      p = skipwhite(p + 1);             /* skip comma in between arguments */
    } while (!ends_excmd(*p));
    if (failed)
      break;
    if (round == 1) {
      retval = xmalloc((count + 1) * sizeof(short));
      retval[count] = 0;            /* zero means end of the list */
      total_count = count;
    }
  }

  *arg = p;
  if (failed || retval == NULL) {
    xfree(retval);
    return FAIL;
  }

  if (*list == NULL)
    *list = retval;
  else
    xfree(retval);           /* list already found, don't overwrite it */

  return OK;
}

/*
 * Make a copy of an ID list.
 */
static short *copy_id_list(short *list)
{
  int len;
  int count;
  short   *retval;

  if (list == NULL)
    return NULL;

  for (count = 0; list[count]; ++count)
    ;
  len = (count + 1) * sizeof(short);
  retval = xmalloc(len);
  memmove(retval, list, (size_t)len);

  return retval;
}

/*
 * Check if syntax group "ssp" is in the ID list "list" of "cur_si".
 * "cur_si" can be NULL if not checking the "containedin" list.
 * Used to check if a syntax item is in the "contains" or "nextgroup" list of
 * the current item.
 * This function is called very often, keep it fast!!
 */
static int 
in_id_list (
    stateitem_T *cur_si,            /* current item or NULL */
    short *list,              /* id list */
    struct sp_syn *ssp,             /* group id and ":syn include" tag of group */
    int contained                  /* group id is contained */
)
{
  int retval;
  short       *scl_list;
  short item;
  short id = ssp->id;
  static int depth = 0;
  int r;

  /* If ssp has a "containedin" list and "cur_si" is in it, return TRUE. */
  if (cur_si != NULL && ssp->cont_in_list != NULL
      && !(cur_si->si_flags & HL_MATCH)) {
    /* Ignore transparent items without a contains argument.  Double check
     * that we don't go back past the first one. */
    while ((cur_si->si_flags & HL_TRANS_CONT)
           && cur_si > (stateitem_T *)(current_state.ga_data))
      --cur_si;
    /* cur_si->si_idx is -1 for keywords, these never contain anything. */
    if (cur_si->si_idx >= 0 && in_id_list(NULL, ssp->cont_in_list,
            &(SYN_ITEMS(syn_block)[cur_si->si_idx].sp_syn),
            SYN_ITEMS(syn_block)[cur_si->si_idx].sp_flags & HL_CONTAINED))
      return TRUE;
  }

  if (list == NULL)
    return FALSE;

  /*
   * If list is ID_LIST_ALL, we are in a transparent item that isn't
   * inside anything.  Only allow not-contained groups.
   */
  if (list == ID_LIST_ALL)
    return !contained;

  /*
   * If the first item is "ALLBUT", return TRUE if "id" is NOT in the
   * contains list.  We also require that "id" is at the same ":syn include"
   * level as the list.
   */
  item = *list;
  if (item >= SYNID_ALLBUT && item < SYNID_CLUSTER) {
    if (item < SYNID_TOP) {
      /* ALL or ALLBUT: accept all groups in the same file */
      if (item - SYNID_ALLBUT != ssp->inc_tag)
        return FALSE;
    } else if (item < SYNID_CONTAINED)   {
      /* TOP: accept all not-contained groups in the same file */
      if (item - SYNID_TOP != ssp->inc_tag || contained)
        return FALSE;
    } else {
      /* CONTAINED: accept all contained groups in the same file */
      if (item - SYNID_CONTAINED != ssp->inc_tag || !contained)
        return FALSE;
    }
    item = *++list;
    retval = FALSE;
  } else
    retval = TRUE;

  /*
   * Return "retval" if id is in the contains list.
   */
  while (item != 0) {
    if (item == id)
      return retval;
    if (item >= SYNID_CLUSTER) {
      scl_list = SYN_CLSTR(syn_block)[item - SYNID_CLUSTER].scl_list;
      /* restrict recursiveness to 30 to avoid an endless loop for a
       * cluster that includes itself (indirectly) */
      if (scl_list != NULL && depth < 30) {
        ++depth;
        r = in_id_list(NULL, scl_list, ssp, contained);
        --depth;
        if (r)
          return retval;
      }
    }
    item = *++list;
  }
  return !retval;
}

struct subcommand {
  char    *name;                                /* subcommand name */
  void    (*func)(exarg_T *, int);              /* function to call */
};

static struct subcommand subcommands[] =
{
  { "case",      syn_cmd_case },
  { "clear",     syn_cmd_clear },
  { "cluster",   syn_cmd_cluster },
  { "conceal",   syn_cmd_conceal },
  { "enable",    syn_cmd_enable },
  { "include",   syn_cmd_include },
  { "iskeyword", syn_cmd_iskeyword },
  { "keyword",   syn_cmd_keyword },
  { "list",      syn_cmd_list },
  { "manual",    syn_cmd_manual },
  { "match",     syn_cmd_match },
  { "on",        syn_cmd_on },
  { "off",       syn_cmd_off },
  { "region",    syn_cmd_region },
  { "reset",     syn_cmd_reset },
  { "spell",     syn_cmd_spell },
  { "sync",      syn_cmd_sync },
  { "",          syn_cmd_list },
  { NULL, NULL }
};

/*
 * ":syntax".
 * This searches the subcommands[] table for the subcommand name, and calls a
 * syntax_subcommand() function to do the rest.
 */
void ex_syntax(exarg_T *eap)
{
  char_u      *arg = eap->arg;
  char_u      *subcmd_end;
  char_u      *subcmd_name;
  int i;

  syn_cmdlinep = eap->cmdlinep;

  /* isolate subcommand name */
  for (subcmd_end = arg; ASCII_ISALPHA(*subcmd_end); ++subcmd_end)
    ;
  subcmd_name = vim_strnsave(arg, (int)(subcmd_end - arg));
  if (eap->skip)              /* skip error messages for all subcommands */
    ++emsg_skip;
  for (i = 0;; ++i) {
    if (subcommands[i].name == NULL) {
      EMSG2(_("E410: Invalid :syntax subcommand: %s"), subcmd_name);
      break;
    }
    if (STRCMP(subcmd_name, (char_u *)subcommands[i].name) == 0) {
      eap->arg = skipwhite(subcmd_end);
      (subcommands[i].func)(eap, FALSE);
      break;
    }
  }
  xfree(subcmd_name);
  if (eap->skip)
    --emsg_skip;
}

void ex_ownsyntax(exarg_T *eap)
{
  char_u      *old_value;
  char_u      *new_value;

  if (curwin->w_s == &curwin->w_buffer->b_s) {
    curwin->w_s = xmalloc(sizeof(synblock_T));
    memset(curwin->w_s, 0, sizeof(synblock_T));
    hash_init(&curwin->w_s->b_keywtab);
    hash_init(&curwin->w_s->b_keywtab_ic);
    // TODO: Keep the spell checking as it was. NOLINT(readability/todo)
    curwin->w_p_spell = false;  // No spell checking
    clear_string_option(&curwin->w_s->b_p_spc);
    clear_string_option(&curwin->w_s->b_p_spf);
    clear_string_option(&curwin->w_s->b_p_spl);
    clear_string_option(&curwin->w_s->b_syn_isk);
  }

  // Save value of b:current_syntax.
  old_value = get_var_value("b:current_syntax");
  if (old_value != NULL) {
    old_value = vim_strsave(old_value);
  }

  /* Apply the "syntax" autocommand event, this finds and loads the syntax
   * file. */
  apply_autocmds(EVENT_SYNTAX, eap->arg, curbuf->b_fname, TRUE, curbuf);

  // Move value of b:current_syntax to w:current_syntax.
  new_value = get_var_value("b:current_syntax");
  if (new_value != NULL) {
    set_internal_string_var((char_u *)"w:current_syntax", new_value);
  }

  // Restore value of b:current_syntax.
  if (old_value == NULL) {
    do_unlet(S_LEN("b:current_syntax"), true);
  } else {
    set_internal_string_var((char_u *)"b:current_syntax", old_value);
    xfree(old_value);
  }
}

bool syntax_present(win_T *win)
{
  return win->w_s->b_syn_patterns.ga_len != 0
         || win->w_s->b_syn_clusters.ga_len != 0
         || win->w_s->b_keywtab.ht_used > 0
         || win->w_s->b_keywtab_ic.ht_used > 0;
}


static enum {
  EXP_SUBCMD,       /* expand ":syn" sub-commands */
  EXP_CASE          /* expand ":syn case" arguments */
} expand_what;

/*
 * Reset include_link, include_default, include_none to 0.
 * Called when we are done expanding.
 */
void reset_expand_highlight(void)
{
  include_link = include_default = include_none = 0;
}

/*
 * Handle command line completion for :match and :echohl command: Add "None"
 * as highlight group.
 */
void set_context_in_echohl_cmd(expand_T *xp, const char *arg)
{
  xp->xp_context = EXPAND_HIGHLIGHT;
  xp->xp_pattern = (char_u *)arg;
  include_none = 1;
}

/*
 * Handle command line completion for :syntax command.
 */
void set_context_in_syntax_cmd(expand_T *xp, const char *arg)
{
  // Default: expand subcommands.
  xp->xp_context = EXPAND_SYNTAX;
  expand_what = EXP_SUBCMD;
  xp->xp_pattern = (char_u *)arg;
  include_link = 0;
  include_default = 0;

  /* (part of) subcommand already typed */
  if (*arg != NUL) {
    const char *p = (const char *)skiptowhite((const char_u *)arg);
    if (*p != NUL) {  // Past first word.
      xp->xp_pattern = skipwhite((const char_u *)p);
      if (*skiptowhite(xp->xp_pattern) != NUL) {
        xp->xp_context = EXPAND_NOTHING;
      } else if (STRNICMP(arg, "case", p - arg) == 0) {
        expand_what = EXP_CASE;
      } else if (STRNICMP(arg, "keyword", p - arg) == 0
                 || STRNICMP(arg, "region", p - arg) == 0
                 || STRNICMP(arg, "match", p - arg) == 0
                 || STRNICMP(arg, "list", p - arg) == 0) {
        xp->xp_context = EXPAND_HIGHLIGHT;
      } else {
        xp->xp_context = EXPAND_NOTHING;
      }
    }
  }
}

static char *(case_args[]) = {"match", "ignore", NULL};

/*
 * Function given to ExpandGeneric() to obtain the list syntax names for
 * expansion.
 */
char_u *get_syntax_name(expand_T *xp, int idx)
{
  if (expand_what == EXP_SUBCMD)
    return (char_u *)subcommands[idx].name;
  return (char_u *)case_args[idx];
}


// Function called for expression evaluation: get syntax ID at file position.
int syn_get_id(
    win_T *wp,
    long lnum,
    colnr_T col,
    int trans,      // remove transparency
    bool *spellp,   // return: can do spell checking
    int keep_state  // keep state of char at "col"
)
{
  // When the position is not after the current position and in the same
  // line of the same buffer, need to restart parsing.
  if (wp->w_buffer != syn_buf
      || lnum != current_lnum
      || col < current_col) {
    syntax_start(wp, lnum);
  } else if (wp->w_buffer == syn_buf
             && lnum == current_lnum
             && col > current_col) {
      // next_match may not be correct when moving around, e.g. with the
      // "skip" expression in searchpair()
      next_match_idx = -1;
  }

  (void)get_syntax_attr(col, spellp, keep_state);

  return trans ? current_trans_id : current_id;
}

/*
 * Get extra information about the syntax item.  Must be called right after
 * get_syntax_attr().
 * Stores the current item sequence nr in "*seqnrp".
 * Returns the current flags.
 */
int get_syntax_info(int *seqnrp)
{
  *seqnrp = current_seqnr;
  return current_flags;
}


/// Get the sequence number of the concealed file position.
///
/// @return seqnr if the file position is concealed, 0 otherwise.
int syn_get_concealed_id(win_T *wp, linenr_T lnum, colnr_T col)
{
  int seqnr;
  int syntax_flags;

  (void)syn_get_id(wp, lnum, col, false, NULL, false);
  syntax_flags = get_syntax_info(&seqnr);

  if (syntax_flags & HL_CONCEAL) {
    return seqnr;
  }
  return 0;
}

/*
 * Return conceal substitution character
 */
int syn_get_sub_char(void)
{
  return current_sub_char;
}

/*
 * Return the syntax ID at position "i" in the current stack.
 * The caller must have called syn_get_id() before to fill the stack.
 * Returns -1 when "i" is out of range.
 */
int syn_get_stack_item(int i)
{
  if (i >= current_state.ga_len) {
    /* Need to invalidate the state, because we didn't properly finish it
     * for the last character, "keep_state" was TRUE. */
    invalidate_current_state();
    current_col = MAXCOL;
    return -1;
  }
  return CUR_STATE(i).si_id;
}

/*
 * Function called to get folding level for line "lnum" in window "wp".
 */
int syn_get_foldlevel(win_T *wp, long lnum)
{
  int level = 0;

  /* Return quickly when there are no fold items at all. */
  if (wp->w_s->b_syn_folditems != 0) {
    syntax_start(wp, lnum);

    for (int i = 0; i < current_state.ga_len; ++i) {
      if (CUR_STATE(i).si_flags & HL_FOLD) {
        ++level;
      }
    }
  }
  if (level > wp->w_p_fdn) {
    level = wp->w_p_fdn;
    if (level < 0)
      level = 0;
  }
  return level;
}

/*
 * ":syntime".
 */
void ex_syntime(exarg_T *eap)
{
  if (STRCMP(eap->arg, "on") == 0)
    syn_time_on = TRUE;
  else if (STRCMP(eap->arg, "off") == 0)
    syn_time_on = FALSE;
  else if (STRCMP(eap->arg, "clear") == 0)
    syntime_clear();
  else if (STRCMP(eap->arg, "report") == 0)
    syntime_report();
  else
    EMSG2(_(e_invarg2), eap->arg);
}

static void syn_clear_time(syn_time_T *st)
{
  st->total = profile_zero();
  st->slowest = profile_zero();
  st->count = 0;
  st->match = 0;
}

/*
 * Clear the syntax timing for the current buffer.
 */
static void syntime_clear(void)
{
  synpat_T    *spp;

  if (!syntax_present(curwin)) {
    MSG(_(msg_no_items));
    return;
  }
  for (int idx = 0; idx < curwin->w_s->b_syn_patterns.ga_len; ++idx) {
    spp = &(SYN_ITEMS(curwin->w_s)[idx]);
    syn_clear_time(&spp->sp_time);
  }
}

/*
 * Function given to ExpandGeneric() to obtain the possible arguments of the
 * ":syntime {on,off,clear,report}" command.
 */
char_u *get_syntime_arg(expand_T *xp, int idx)
{
  switch (idx) {
  case 0: return (char_u *)"on";
  case 1: return (char_u *)"off";
  case 2: return (char_u *)"clear";
  case 3: return (char_u *)"report";
  }
  return NULL;
}

static int syn_compare_syntime(const void *v1, const void *v2)
{
  const time_entry_T  *s1 = v1;
  const time_entry_T  *s2 = v2;

  return profile_cmp(s1->total, s2->total);
}

/*
 * Clear the syntax timing for the current buffer.
 */
static void syntime_report(void)
{
  if (!syntax_present(curwin)) {
    MSG(_(msg_no_items));
    return;
  }

  garray_T ga;
  ga_init(&ga, sizeof(time_entry_T), 50);

  proftime_T total_total = profile_zero();
  int total_count = 0;
  time_entry_T *p;
  for (int idx = 0; idx < curwin->w_s->b_syn_patterns.ga_len; ++idx) {
    synpat_T *spp = &(SYN_ITEMS(curwin->w_s)[idx]);
    if (spp->sp_time.count > 0) {
      p = GA_APPEND_VIA_PTR(time_entry_T, &ga);
      p->total = spp->sp_time.total;
      total_total = profile_add(total_total, spp->sp_time.total);
      p->count = spp->sp_time.count;
      p->match = spp->sp_time.match;
      total_count += spp->sp_time.count;
      p->slowest = spp->sp_time.slowest;
      proftime_T tm = profile_divide(spp->sp_time.total, spp->sp_time.count);
      p->average = tm;
      p->id = spp->sp_syn.id;
      p->pattern = spp->sp_pattern;
    }
  }

  /* sort on total time */
  qsort(ga.ga_data, (size_t)ga.ga_len, sizeof(time_entry_T),
      syn_compare_syntime);

  MSG_PUTS_TITLE(_(
          "  TOTAL      COUNT  MATCH   SLOWEST     AVERAGE   NAME               PATTERN"));
  MSG_PUTS("\n");
  for (int idx = 0; idx < ga.ga_len && !got_int; ++idx) {
    p = ((time_entry_T *)ga.ga_data) + idx;

    MSG_PUTS(profile_msg(p->total));
    MSG_PUTS(" ");     /* make sure there is always a separating space */
    msg_advance(13);
    msg_outnum(p->count);
    MSG_PUTS(" ");
    msg_advance(20);
    msg_outnum(p->match);
    MSG_PUTS(" ");
    msg_advance(26);
    MSG_PUTS(profile_msg(p->slowest));
    MSG_PUTS(" ");
    msg_advance(38);
    MSG_PUTS(profile_msg(p->average));
    MSG_PUTS(" ");
    msg_advance(50);
    msg_outtrans(HL_TABLE()[p->id - 1].sg_name);
    MSG_PUTS(" ");

    msg_advance(69);
    int len;
    if (Columns < 80)
      len = 20;       /* will wrap anyway */
    else
      len = Columns - 70;
    if (len > (int)STRLEN(p->pattern))
      len = (int)STRLEN(p->pattern);
    msg_outtrans_len(p->pattern, len);
    MSG_PUTS("\n");
  }
  ga_clear(&ga);
  if (!got_int) {
    MSG_PUTS("\n");
    MSG_PUTS(profile_msg(total_total));
    msg_advance(13);
    msg_outnum(total_count);
    MSG_PUTS("\n");
  }
}

/**************************************
*  Highlighting stuff		      *
**************************************/

// The default highlight groups.  These are compiled-in for fast startup and
// they still work when the runtime files can't be found.
//
// When making changes here, also change runtime/colors/default.vim!

static char *highlight_init_both[] =
{
  "Conceal      ctermbg=DarkGrey ctermfg=LightGrey guibg=DarkGrey guifg=LightGrey",
  "Cursor       guibg=fg guifg=bg",
  "lCursor      guibg=fg guifg=bg",
  "DiffText     cterm=bold ctermbg=Red gui=bold guibg=Red",
  "ErrorMsg     ctermbg=DarkRed ctermfg=White guibg=Red guifg=White",
  "IncSearch    cterm=reverse gui=reverse",
  "ModeMsg      cterm=bold gui=bold",
  "NonText      ctermfg=Blue gui=bold guifg=Blue",
  "PmenuSbar    ctermbg=Grey guibg=Grey",
  "StatusLine   cterm=reverse,bold gui=reverse,bold",
  "StatusLineNC cterm=reverse gui=reverse",
  "TabLineFill  cterm=reverse gui=reverse",
  "TabLineSel   cterm=bold gui=bold",
  "TermCursor   cterm=reverse gui=reverse",
  "VertSplit    cterm=reverse gui=reverse",
  "WildMenu     ctermbg=Yellow ctermfg=Black guibg=Yellow guifg=Black",
  "default link EndOfBuffer NonText",
  "default link QuickFixLine Search",
  "default link Substitute Search",
  "default link Whitespace NonText",
  NULL
};

static char *highlight_init_light[] =
{
  "ColorColumn  ctermbg=LightRed guibg=LightRed",
  "CursorColumn ctermbg=LightGrey guibg=Grey90",
  "CursorLine   cterm=underline guibg=Grey90",
  "CursorLineNr ctermfg=Brown gui=bold guifg=Brown",
  "DiffAdd      ctermbg=LightBlue guibg=LightBlue",
  "DiffChange   ctermbg=LightMagenta guibg=LightMagenta",
  "DiffDelete   ctermfg=Blue ctermbg=LightCyan gui=bold guifg=Blue guibg=LightCyan",
  "Directory    ctermfg=DarkBlue guifg=Blue",
  "FoldColumn   ctermbg=Grey ctermfg=DarkBlue guibg=Grey guifg=DarkBlue",
  "Folded       ctermbg=Grey ctermfg=DarkBlue guibg=LightGrey guifg=DarkBlue",
  "LineNr       ctermfg=Brown guifg=Brown",
  "MatchParen   ctermbg=Cyan guibg=Cyan",
  "MoreMsg      ctermfg=DarkGreen gui=bold guifg=SeaGreen",
  "Pmenu        ctermbg=LightMagenta ctermfg=Black guibg=LightMagenta",
  "PmenuSel     ctermbg=LightGrey ctermfg=Black guibg=Grey",
  "PmenuThumb   ctermbg=Black guibg=Black",
  "Question     ctermfg=DarkGreen gui=bold guifg=SeaGreen",
  "Search       ctermbg=Yellow ctermfg=NONE guibg=Yellow guifg=NONE",
  "SignColumn   ctermbg=Grey ctermfg=DarkBlue guibg=Grey guifg=DarkBlue",
  "SpecialKey   ctermfg=DarkBlue guifg=Blue",
  "SpellBad     ctermbg=LightRed guisp=Red gui=undercurl",
  "SpellCap     ctermbg=LightBlue guisp=Blue gui=undercurl",
  "SpellLocal   ctermbg=Cyan guisp=DarkCyan gui=undercurl",
  "SpellRare    ctermbg=LightMagenta guisp=Magenta gui=undercurl",
  "TabLine      cterm=underline ctermfg=black ctermbg=LightGrey gui=underline guibg=LightGrey",
  "Title        ctermfg=DarkMagenta gui=bold guifg=Magenta",
  "Visual       guibg=LightGrey",
  "WarningMsg   ctermfg=DarkRed guifg=Red",
  NULL
};

static char *highlight_init_dark[] =
{
  "ColorColumn  ctermbg=DarkRed guibg=DarkRed",
  "CursorColumn ctermbg=DarkGrey guibg=Grey40",
  "CursorLine   cterm=underline guibg=Grey40",
  "CursorLineNr ctermfg=Yellow gui=bold guifg=Yellow",
  "DiffAdd      ctermbg=DarkBlue guibg=DarkBlue",
  "DiffChange   ctermbg=DarkMagenta guibg=DarkMagenta",
  "DiffDelete   ctermfg=Blue ctermbg=DarkCyan gui=bold guifg=Blue guibg=DarkCyan",
  "Directory    ctermfg=LightCyan guifg=Cyan",
  "FoldColumn   ctermbg=DarkGrey ctermfg=Cyan guibg=Grey guifg=Cyan",
  "Folded       ctermbg=DarkGrey ctermfg=Cyan guibg=DarkGrey guifg=Cyan",
  "LineNr       ctermfg=Yellow guifg=Yellow",
  "MatchParen   ctermbg=DarkCyan guibg=DarkCyan",
  "MoreMsg      ctermfg=LightGreen gui=bold guifg=SeaGreen",
  "Pmenu        ctermbg=Magenta ctermfg=Black guibg=Magenta",
  "PmenuSel     ctermbg=Black ctermfg=DarkGrey guibg=DarkGrey",
  "PmenuThumb   ctermbg=White guibg=White",
  "Question     ctermfg=LightGreen gui=bold guifg=Green",
  "Search       ctermbg=Yellow ctermfg=Black guibg=Yellow guifg=Black",
  "SignColumn   ctermbg=DarkGrey ctermfg=Cyan guibg=Grey guifg=Cyan",
  "SpecialKey   ctermfg=LightBlue guifg=Cyan",
  "SpellBad     ctermbg=Red guisp=Red gui=undercurl",
  "SpellCap     ctermbg=Blue guisp=Blue gui=undercurl",
  "SpellLocal   ctermbg=Cyan guisp=Cyan gui=undercurl",
  "SpellRare    ctermbg=Magenta guisp=Magenta gui=undercurl",
  "TabLine      cterm=underline ctermfg=white ctermbg=DarkGrey gui=underline guibg=DarkGrey",
  "Title        ctermfg=LightMagenta gui=bold guifg=Magenta",
  "Visual       guibg=DarkGrey",
  "WarningMsg   ctermfg=LightRed guifg=Red",
  NULL
};

void 
init_highlight (
    int both,                   /* include groups where 'bg' doesn't matter */
    int reset                  /* clear group first */
)
{
  int i;
  char        **pp;
  static int had_both = FALSE;

  /*
   * Try finding the color scheme file.  Used when a color file was loaded
   * and 'background' or 't_Co' is changed.
   */
  char_u *p = get_var_value("g:colors_name");
  if (p != NULL) {
    // Value of g:colors_name could be freed in load_colors() and make
    // p invalid, so copy it.
    char_u *copy_p = vim_strsave(p);
    bool okay = load_colors(copy_p);
    xfree(copy_p);
    if (okay) {
        return;
    }
  }

  /*
   * Didn't use a color file, use the compiled-in colors.
   */
  if (both) {
    had_both = TRUE;
    pp = highlight_init_both;
    for (i = 0; pp[i] != NULL; ++i)
      do_highlight((char_u *)pp[i], reset, TRUE);
  } else if (!had_both)
    /* Don't do anything before the call with both == TRUE from main().
     * Not everything has been setup then, and that call will overrule
     * everything anyway. */
    return;

  if (*p_bg == 'l')
    pp = highlight_init_light;
  else
    pp = highlight_init_dark;
  for (i = 0; pp[i] != NULL; ++i)
    do_highlight((char_u *)pp[i], reset, TRUE);

  /* Reverse looks ugly, but grey may not work for 8 colors.  Thus let it
   * depend on the number of colors available.
   * With 8 colors brown is equal to yellow, need to use black for Search fg
   * to avoid Statement highlighted text disappears.
   * Clear the attributes, needed when changing the t_Co value. */
  if (t_colors > 8)
    do_highlight(
        (char_u *)(*p_bg == 'l'
                   ? "Visual cterm=NONE ctermbg=LightGrey"
                   : "Visual cterm=NONE ctermbg=DarkGrey"), FALSE,
        TRUE);
  else {
    do_highlight((char_u *)"Visual cterm=reverse ctermbg=NONE",
        FALSE, TRUE);
    if (*p_bg == 'l')
      do_highlight((char_u *)"Search ctermfg=black", FALSE, TRUE);
  }

  /*
   * If syntax highlighting is enabled load the highlighting for it.
   */
  if (get_var_value("g:syntax_on") != NULL) {
    static int recursive = 0;

    if (recursive >= 5) {
      EMSG(_("E679: recursive loop loading syncolor.vim"));
    } else {
      recursive++;
      (void)source_runtime((char_u *)"syntax/syncolor.vim", DIP_ALL);
      recursive--;
    }
  }
}

/*
 * Load color file "name".
 * Return OK for success, FAIL for failure.
 */
int load_colors(char_u *name)
{
  char_u      *buf;
  int retval = FAIL;
  static int recursive = false;

  // When being called recursively, this is probably because setting
  // 'background' caused the highlighting to be reloaded.  This means it is
  // working, thus we should return OK.
  if (recursive) {
    return OK;
  }

  recursive = true;
  size_t buflen = STRLEN(name) + 12;
  buf = xmalloc(buflen);
  snprintf((char *)buf, buflen, "colors/%s.vim", name);
  retval = source_runtime(buf, DIP_START + DIP_OPT);
  xfree(buf);
  apply_autocmds(EVENT_COLORSCHEME, name, curbuf->b_fname, FALSE, curbuf);

  recursive = false;
  ui_refresh();

  return retval;
}


/// Handle the ":highlight .." command.
/// When using ":hi clear" this is called recursively for each group with
/// "forceit" and "init" both TRUE.
/// @param init TRUE when called for initializing
void
do_highlight(
    char_u *line,
    int forceit,
    int init
)
{
  char_u      *name_end;
  char_u      *linep;
  char_u      *key_start;
  char_u      *arg_start;
  char_u      *key = NULL, *arg = NULL;
  long i;
  int off;
  int len;
  int attr;
  int id;
  int idx;
  int dodefault = FALSE;
  int doclear = FALSE;
  int dolink = FALSE;
  int error = FALSE;
  int color;
  int is_normal_group = FALSE;                  /* "Normal" group */

  /*
   * If no argument, list current highlighting.
   */
  if (ends_excmd(*line)) {
    for (int i = 1; i <= highlight_ga.ga_len && !got_int; ++i)
      /* TODO: only call when the group has attributes set */
      highlight_list_one(i);
    return;
  }

  /*
   * Isolate the name.
   */
  name_end = skiptowhite(line);
  linep = skipwhite(name_end);

  /*
   * Check for "default" argument.
   */
  if (STRNCMP(line, "default", name_end - line) == 0) {
    dodefault = TRUE;
    line = linep;
    name_end = skiptowhite(line);
    linep = skipwhite(name_end);
  }

  /*
   * Check for "clear" or "link" argument.
   */
  if (STRNCMP(line, "clear", name_end - line) == 0)
    doclear = TRUE;
  if (STRNCMP(line, "link", name_end - line) == 0)
    dolink = TRUE;

  /*
   * ":highlight {group-name}": list highlighting for one group.
   */
  if (!doclear && !dolink && ends_excmd(*linep)) {
    id = syn_namen2id(line, (int)(name_end - line));
    if (id == 0)
      EMSG2(_("E411: highlight group not found: %s"), line);
    else
      highlight_list_one(id);
    return;
  }

  /*
   * Handle ":highlight link {from} {to}" command.
   */
  if (dolink) {
    char_u      *from_start = linep;
    char_u      *from_end;
    char_u      *to_start;
    char_u      *to_end;
    int from_id;
    int to_id;

    from_end = skiptowhite(from_start);
    to_start = skipwhite(from_end);
    to_end   = skiptowhite(to_start);

    if (ends_excmd(*from_start) || ends_excmd(*to_start)) {
      EMSG2(_("E412: Not enough arguments: \":highlight link %s\""),
          from_start);
      return;
    }

    if (!ends_excmd(*skipwhite(to_end))) {
      EMSG2(_("E413: Too many arguments: \":highlight link %s\""), from_start);
      return;
    }

    from_id = syn_check_group(from_start, (int)(from_end - from_start));
    if (STRNCMP(to_start, "NONE", 4) == 0)
      to_id = 0;
    else
      to_id = syn_check_group(to_start, (int)(to_end - to_start));

    if (from_id > 0 && (!init || HL_TABLE()[from_id - 1].sg_set == 0)) {
      /*
       * Don't allow a link when there already is some highlighting
       * for the group, unless '!' is used
       */
      if (to_id > 0 && !forceit && !init
          && hl_has_settings(from_id - 1, dodefault)) {
        if (sourcing_name == NULL && !dodefault)
          EMSG(_("E414: group has settings, highlight link ignored"));
      } else {
        if (!init)
          HL_TABLE()[from_id - 1].sg_set |= SG_LINK;
        HL_TABLE()[from_id - 1].sg_link = to_id;
        HL_TABLE()[from_id - 1].sg_scriptID = current_SID;
        redraw_all_later(SOME_VALID);
      }
    }

    /* Only call highlight_changed() once, after sourcing a syntax file */
    need_highlight_changed = TRUE;

    return;
  }

  if (doclear) {
    /*
     * ":highlight clear [group]" command.
     */
    line = linep;
    if (ends_excmd(*line)) {
      do_unlet(S_LEN("colors_name"), true);
      restore_cterm_colors();

      /*
       * Clear all default highlight groups and load the defaults.
       */
      for (int idx = 0; idx < highlight_ga.ga_len; ++idx) {
        highlight_clear(idx);
      }
      init_highlight(TRUE, TRUE);
      highlight_changed();
      redraw_later_clear();
      return;
    }
    name_end = skiptowhite(line);
    linep = skipwhite(name_end);
  }

  /*
   * Find the group name in the table.  If it does not exist yet, add it.
   */
  id = syn_check_group(line, (int)(name_end - line));
  if (id == 0)                          /* failed (out of memory) */
    return;
  idx = id - 1;                         /* index is ID minus one */

  /* Return if "default" was used and the group already has settings. */
  if (dodefault && hl_has_settings(idx, TRUE))
    return;

  if (STRCMP(HL_TABLE()[idx].sg_name_u, "NORMAL") == 0)
    is_normal_group = TRUE;

  /* Clear the highlighting for ":hi clear {group}" and ":hi clear". */
  if (doclear || (forceit && init)) {
    highlight_clear(idx);
    if (!doclear)
      HL_TABLE()[idx].sg_set = 0;
  }

  if (!doclear)
    while (!ends_excmd(*linep)) {
      key_start = linep;
      if (*linep == '=') {
        EMSG2(_("E415: unexpected equal sign: %s"), key_start);
        error = TRUE;
        break;
      }

      // Isolate the key ("term", "ctermfg", "ctermbg", "font", "guifg",
      // "guibg" or "guisp").
      while (*linep && !ascii_iswhite(*linep) && *linep != '=') {
        linep++;
      }
      xfree(key);
      key = vim_strnsave_up(key_start, (int)(linep - key_start));
      linep = skipwhite(linep);

      if (STRCMP(key, "NONE") == 0) {
        if (!init || HL_TABLE()[idx].sg_set == 0) {
          if (!init)
            HL_TABLE()[idx].sg_set |= SG_CTERM+SG_GUI;
          highlight_clear(idx);
        }
        continue;
      }

      /*
       * Check for the equal sign.
       */
      if (*linep != '=') {
        EMSG2(_("E416: missing equal sign: %s"), key_start);
        error = TRUE;
        break;
      }
      ++linep;

      /*
       * Isolate the argument.
       */
      linep = skipwhite(linep);
      if (*linep == '\'') {             /* guifg='color name' */
        arg_start = ++linep;
        linep = vim_strchr(linep, '\'');
        if (linep == NULL) {
          EMSG2(_(e_invarg2), key_start);
          error = TRUE;
          break;
        }
      } else {
        arg_start = linep;
        linep = skiptowhite(linep);
      }
      if (linep == arg_start) {
        EMSG2(_("E417: missing argument: %s"), key_start);
        error = TRUE;
        break;
      }
      xfree(arg);
      arg = vim_strnsave(arg_start, (int)(linep - arg_start));

      if (*linep == '\'')
        ++linep;

      /*
       * Store the argument.
       */
      if (  STRCMP(key, "TERM") == 0
            || STRCMP(key, "CTERM") == 0
            || STRCMP(key, "GUI") == 0) {
        attr = 0;
        off = 0;
        while (arg[off] != NUL) {
          for (i = ARRAY_SIZE(hl_attr_table); --i >= 0; ) {
            len = (int)STRLEN(hl_name_table[i]);
            if (STRNICMP(arg + off, hl_name_table[i], len) == 0) {
              attr |= hl_attr_table[i];
              off += len;
              break;
            }
          }
          if (i < 0) {
            EMSG2(_("E418: Illegal value: %s"), arg);
            error = TRUE;
            break;
          }
          if (arg[off] == ',')                  /* another one follows */
            ++off;
        }
        if (error)
          break;
        if (*key == 'C')   {
          if (!init || !(HL_TABLE()[idx].sg_set & SG_CTERM)) {
            if (!init)
              HL_TABLE()[idx].sg_set |= SG_CTERM;
            HL_TABLE()[idx].sg_cterm = attr;
            HL_TABLE()[idx].sg_cterm_bold = FALSE;
          }
        } else if (*key == 'G') {
          if (!init || !(HL_TABLE()[idx].sg_set & SG_GUI)) {
            if (!init)
              HL_TABLE()[idx].sg_set |= SG_GUI;
            HL_TABLE()[idx].sg_gui = attr;
          }
        }
      } else if (STRCMP(key, "FONT") == 0)   {
        /* in non-GUI fonts are simply ignored */
      } else if (STRCMP(key,
                     "CTERMFG") == 0 || STRCMP(key, "CTERMBG") == 0)   {
        if (!init || !(HL_TABLE()[idx].sg_set & SG_CTERM)) {
          if (!init)
            HL_TABLE()[idx].sg_set |= SG_CTERM;

          /* When setting the foreground color, and previously the "bold"
           * flag was set for a light color, reset it now */
          if (key[5] == 'F' && HL_TABLE()[idx].sg_cterm_bold) {
            HL_TABLE()[idx].sg_cterm &= ~HL_BOLD;
            HL_TABLE()[idx].sg_cterm_bold = FALSE;
          }

          if (ascii_isdigit(*arg))
            color = atoi((char *)arg);
          else if (STRICMP(arg, "fg") == 0) {
            if (cterm_normal_fg_color)
              color = cterm_normal_fg_color - 1;
            else {
              EMSG(_("E419: FG color unknown"));
              error = TRUE;
              break;
            }
          } else if (STRICMP(arg, "bg") == 0)   {
            if (cterm_normal_bg_color > 0)
              color = cterm_normal_bg_color - 1;
            else {
              EMSG(_("E420: BG color unknown"));
              error = TRUE;
              break;
            }
          } else {
            static char *(color_names[28]) = {
              "Black", "DarkBlue", "DarkGreen", "DarkCyan",
              "DarkRed", "DarkMagenta", "Brown", "DarkYellow",
              "Gray", "Grey",
              "LightGray", "LightGrey", "DarkGray", "DarkGrey",
              "Blue", "LightBlue", "Green", "LightGreen",
              "Cyan", "LightCyan", "Red", "LightRed", "Magenta",
              "LightMagenta", "Yellow", "LightYellow", "White", "NONE"
            };
            static int color_numbers_16[28] = {0, 1, 2, 3,
                                               4, 5, 6, 6,
                                               7, 7,
                                               7, 7, 8, 8,
                                               9, 9, 10, 10,
                                               11, 11, 12, 12, 13,
                                               13, 14, 14, 15, -1};
            /* for xterm with 88 colors... */
            static int color_numbers_88[28] = {0, 4, 2, 6,
                                               1, 5, 32, 72,
                                               84, 84,
                                               7, 7, 82, 82,
                                               12, 43, 10, 61,
                                               14, 63, 9, 74, 13,
                                               75, 11, 78, 15, -1};
            /* for xterm with 256 colors... */
            static int color_numbers_256[28] = {0, 4, 2, 6,
                                                1, 5, 130, 130,
                                                248, 248,
                                                7, 7, 242, 242,
                                                12, 81, 10, 121,
                                                14, 159, 9, 224, 13,
                                                225, 11, 229, 15, -1};
            /* for terminals with less than 16 colors... */
            static int color_numbers_8[28] = {0, 4, 2, 6,
                                              1, 5, 3, 3,
                                              7, 7,
                                              7, 7, 0+8, 0+8,
                                              4+8, 4+8, 2+8, 2+8,
                                              6+8, 6+8, 1+8, 1+8, 5+8,
                                              5+8, 3+8, 3+8, 7+8, -1};

            /* reduce calls to STRICMP a bit, it can be slow */
            off = TOUPPER_ASC(*arg);
            for (i = ARRAY_SIZE(color_names); --i >= 0; )
              if (off == color_names[i][0]
                  && STRICMP(arg + 1, color_names[i] + 1) == 0)
                break;
            if (i < 0) {
              EMSG2(_(
                      "E421: Color name or number not recognized: %s"),
                  key_start);
              error = TRUE;
              break;
            }

            /* Use the _16 table to check if its a valid color name. */
            color = color_numbers_16[i];
            if (color >= 0) {
              if (t_colors == 8) {
                /* t_Co is 8: use the 8 colors table */
                color = color_numbers_8[i];
                if (key[5] == 'F') {
                  /* set/reset bold attribute to get light foreground
                   * colors (on some terminals, e.g. "linux") */
                  if (color & 8) {
                    HL_TABLE()[idx].sg_cterm |= HL_BOLD;
                    HL_TABLE()[idx].sg_cterm_bold = TRUE;
                  } else
                    HL_TABLE()[idx].sg_cterm &= ~HL_BOLD;
                }
                color &= 7;             // truncate to 8 colors
              } else if (t_colors == 16 || t_colors == 88 || t_colors >= 256) {
                if (t_colors == 88) {
                    color = color_numbers_88[i];
                } else if (t_colors >= 256) {
                    color = color_numbers_256[i];
                } else {
                    color = color_numbers_8[i];
                }
              }
            }
          }
          /* Add one to the argument, to avoid zero.  Zero is used for
           * "NONE", then "color" is -1. */
          if (key[5] == 'F') {
            HL_TABLE()[idx].sg_cterm_fg = color + 1;
            if (is_normal_group) {
              cterm_normal_fg_color = color + 1;
              cterm_normal_fg_bold = (HL_TABLE()[idx].sg_cterm & HL_BOLD);
              {
                must_redraw = CLEAR;
              }
            }
          } else {
            HL_TABLE()[idx].sg_cterm_bg = color + 1;
            if (is_normal_group) {
              cterm_normal_bg_color = color + 1;
              if (!ui_rgb_attached()) {
                must_redraw = CLEAR;
                if (color >= 0) {
                  if (t_colors < 16) {
                    i = (color == 0 || color == 4);
                  } else {
                    i = (color < 7 || color == 8);
                  }
                  // Set the 'background' option if the value is
                  // wrong.
                  if (i != (*p_bg == 'd')) {
                    set_option_value("bg", 0L, (i ? "dark" : "light"), 0);
                  }
                }
              }
            }
          }
        }
      } else if (STRCMP(key, "GUIFG") == 0)   {
        if (!init || !(HL_TABLE()[idx].sg_set & SG_GUI)) {
          if (!init)
            HL_TABLE()[idx].sg_set |= SG_GUI;

          xfree(HL_TABLE()[idx].sg_rgb_fg_name);
          if (STRCMP(arg, "NONE")) {
            HL_TABLE()[idx].sg_rgb_fg_name = (uint8_t *)xstrdup((char *)arg);
            HL_TABLE()[idx].sg_rgb_fg = name_to_color(arg);
          } else {
            HL_TABLE()[idx].sg_rgb_fg_name = NULL;
            HL_TABLE()[idx].sg_rgb_fg = -1;
          }
        }

        if (is_normal_group) {
          normal_fg = HL_TABLE()[idx].sg_rgb_fg;
        }
      } else if (STRCMP(key, "GUIBG") == 0)   {
        if (!init || !(HL_TABLE()[idx].sg_set & SG_GUI)) {
          if (!init)
            HL_TABLE()[idx].sg_set |= SG_GUI;

          xfree(HL_TABLE()[idx].sg_rgb_bg_name);
          if (STRCMP(arg, "NONE") != 0) {
            HL_TABLE()[idx].sg_rgb_bg_name = (uint8_t *)xstrdup((char *)arg);
            HL_TABLE()[idx].sg_rgb_bg = name_to_color(arg);
          } else {
            HL_TABLE()[idx].sg_rgb_bg_name = NULL;
            HL_TABLE()[idx].sg_rgb_bg = -1;
          }
        }

        if (is_normal_group) {
          normal_bg = HL_TABLE()[idx].sg_rgb_bg;
        }
      } else if (STRCMP(key, "GUISP") == 0)   {
        if (!init || !(HL_TABLE()[idx].sg_set & SG_GUI)) {
          if (!init)
            HL_TABLE()[idx].sg_set |= SG_GUI;

          xfree(HL_TABLE()[idx].sg_rgb_sp_name);
          if (STRCMP(arg, "NONE") != 0) {
            HL_TABLE()[idx].sg_rgb_sp_name = (uint8_t *)xstrdup((char *)arg);
            HL_TABLE()[idx].sg_rgb_sp = name_to_color(arg);
          } else {
            HL_TABLE()[idx].sg_rgb_sp_name = NULL;
            HL_TABLE()[idx].sg_rgb_sp = -1;
          }
        }

        if (is_normal_group) {
          normal_sp = HL_TABLE()[idx].sg_rgb_sp;
        }
      } else if (STRCMP(key, "START") == 0 || STRCMP(key, "STOP") == 0)   {
        // Ignored for now
      } else {
        EMSG2(_("E423: Illegal argument: %s"), key_start);
        error = TRUE;
        break;
      }

      /*
       * When highlighting has been given for a group, don't link it.
       */
      if (!init || !(HL_TABLE()[idx].sg_set & SG_LINK))
        HL_TABLE()[idx].sg_link = 0;

      /*
       * Continue with next argument.
       */
      linep = skipwhite(linep);
    }

  /*
   * If there is an error, and it's a new entry, remove it from the table.
   */
  if (error && idx == highlight_ga.ga_len)
    syn_unadd_group();
  else {
    if (is_normal_group) {
      HL_TABLE()[idx].sg_attr = 0;
      // Need to update all groups, because they might be using "bg" and/or
      // "fg", which have been changed now.
      highlight_attr_set_all();
      // If the normal group has changed, it is simpler to refresh every UI
      ui_refresh();
    } else
      set_hl_attr(idx);
    HL_TABLE()[idx].sg_scriptID = current_SID;
    redraw_all_later(NOT_VALID);
  }
  xfree(key);
  xfree(arg);

  /* Only call highlight_changed() once, after sourcing a syntax file */
  need_highlight_changed = TRUE;
}

#if defined(EXITFREE)
void free_highlight(void)
{
  for (int i = 0; i < highlight_ga.ga_len; ++i) {
    highlight_clear(i);
    xfree(HL_TABLE()[i].sg_name);
    xfree(HL_TABLE()[i].sg_name_u);
  }
  ga_clear(&highlight_ga);
}

#endif

/*
 * Reset the cterm colors to what they were before Vim was started, if
 * possible.  Otherwise reset them to zero.
 */
void restore_cterm_colors(void)
{
  normal_fg = -1;
  normal_bg = -1;
  normal_sp = -1;
  cterm_normal_fg_color = 0;
  cterm_normal_fg_bold = 0;
  cterm_normal_bg_color = 0;
}

/*
 * Return TRUE if highlight group "idx" has any settings.
 * When "check_link" is TRUE also check for an existing link.
 */
static int hl_has_settings(int idx, int check_link)
{
  return HL_TABLE()[idx].sg_attr != 0
         || HL_TABLE()[idx].sg_cterm_fg != 0
         || HL_TABLE()[idx].sg_cterm_bg != 0
         || HL_TABLE()[idx].sg_rgb_fg_name != NULL
         || HL_TABLE()[idx].sg_rgb_bg_name != NULL
         || HL_TABLE()[idx].sg_rgb_sp_name != NULL
         || (check_link && (HL_TABLE()[idx].sg_set & SG_LINK));
}

/*
 * Clear highlighting for one group.
 */
static void highlight_clear(int idx)
{
  HL_TABLE()[idx].sg_attr = 0;
  HL_TABLE()[idx].sg_cterm = 0;
  HL_TABLE()[idx].sg_cterm_bold = FALSE;
  HL_TABLE()[idx].sg_cterm_fg = 0;
  HL_TABLE()[idx].sg_cterm_bg = 0;
  HL_TABLE()[idx].sg_gui = 0;
  HL_TABLE()[idx].sg_rgb_fg = -1;
  HL_TABLE()[idx].sg_rgb_bg = -1;
  HL_TABLE()[idx].sg_rgb_sp = -1;
  xfree(HL_TABLE()[idx].sg_rgb_fg_name);
  HL_TABLE()[idx].sg_rgb_fg_name = NULL;
  xfree(HL_TABLE()[idx].sg_rgb_bg_name);
  HL_TABLE()[idx].sg_rgb_bg_name = NULL;
  xfree(HL_TABLE()[idx].sg_rgb_sp_name);
  HL_TABLE()[idx].sg_rgb_sp_name = NULL;
  // Clear the script ID only when there is no link, since that is not
  // cleared.
  if (HL_TABLE()[idx].sg_link == 0) {
    HL_TABLE()[idx].sg_scriptID = 0;
  }
}


/*
 * Table with the specifications for an attribute number.
 * Note that this table is used by ALL buffers.  This is required because the
 * GUI can redraw at any time for any buffer.
 */
static garray_T attr_table = GA_EMPTY_INIT_VALUE;

#define ATTR_ENTRY(idx) ((attrentry_T *)attr_table.ga_data)[idx]


/// Return the attr number for a set of colors and font.
/// Add a new entry to the term_attr_table, attr_table or gui_attr_table
/// if the combination is new.
/// @return 0 for error.
int get_attr_entry(attrentry_T *aep)
{
  garray_T *table = &attr_table;
  attrentry_T *taep;
  static int recursive = FALSE;

  /*
   * Init the table, in case it wasn't done yet.
   */
  table->ga_itemsize = sizeof(attrentry_T);
  ga_set_growsize(table, 7);

  /*
   * Try to find an entry with the same specifications.
   */
  for (int i = 0; i < table->ga_len; ++i) {
    taep = &(((attrentry_T *)table->ga_data)[i]);
    if (aep->cterm_ae_attr == taep->cterm_ae_attr
        && aep->cterm_fg_color == taep->cterm_fg_color
        && aep->cterm_bg_color == taep->cterm_bg_color
        && aep->rgb_ae_attr == taep->rgb_ae_attr
        && aep->rgb_fg_color == taep->rgb_fg_color
        && aep->rgb_bg_color == taep->rgb_bg_color
        && aep->rgb_sp_color == taep->rgb_sp_color) {
      return i + ATTR_OFF;
    }
  }

  if (table->ga_len + ATTR_OFF > MAX_TYPENR) {
    /*
     * Running out of attribute entries!  remove all attributes, and
     * compute new ones for all groups.
     * When called recursively, we are really out of numbers.
     */
    if (recursive) {
      EMSG(_("E424: Too many different highlighting attributes in use"));
      return 0;
    }
    recursive = TRUE;

    clear_hl_tables();

    must_redraw = CLEAR;

    for (int i = 0; i < highlight_ga.ga_len; ++i) {
      set_hl_attr(i);
    }

    recursive = FALSE;
  }

  
  // This is a new combination of colors and font, add an entry.
  taep = GA_APPEND_VIA_PTR(attrentry_T, table);
  memset(taep, 0, sizeof(*taep));
  taep->cterm_ae_attr = aep->cterm_ae_attr;
  taep->cterm_fg_color = aep->cterm_fg_color;
  taep->cterm_bg_color = aep->cterm_bg_color;
  taep->rgb_ae_attr = aep->rgb_ae_attr;
  taep->rgb_fg_color = aep->rgb_fg_color;
  taep->rgb_bg_color = aep->rgb_bg_color;
  taep->rgb_sp_color = aep->rgb_sp_color;

  return table->ga_len - 1 + ATTR_OFF;
}

// Clear all highlight tables.
void clear_hl_tables(void)
{
  ga_clear(&attr_table);
}

// Combine special attributes (e.g., for spelling) with other attributes
// (e.g., for syntax highlighting).
// "prim_attr" overrules "char_attr".
// This creates a new group when required.
// Since we expect there to be few spelling mistakes we don't cache the
// result.
// Return the resulting attributes.
int hl_combine_attr(int char_attr, int prim_attr)
{
  attrentry_T *char_aep = NULL;
  attrentry_T *spell_aep;
  attrentry_T new_en;

  if (char_attr == 0) {
    return prim_attr;
  }

  if (prim_attr == 0) {
    return char_attr;
  }

  // Find the entry for char_attr
  char_aep = syn_cterm_attr2entry(char_attr);

  if (char_aep != NULL) {
    // Copy all attributes from char_aep to the new entry
    new_en = *char_aep;
  } else {
    memset(&new_en, 0, sizeof(new_en));
  }

  spell_aep = syn_cterm_attr2entry(prim_attr);
  if (spell_aep != NULL) {
    new_en.cterm_ae_attr |= spell_aep->cterm_ae_attr;
    new_en.rgb_ae_attr |= spell_aep->rgb_ae_attr;

    if (spell_aep->cterm_fg_color > 0) {
      new_en.cterm_fg_color = spell_aep->cterm_fg_color;
    }

    if (spell_aep->cterm_bg_color > 0) {
      new_en.cterm_bg_color = spell_aep->cterm_bg_color;
    }

    if (spell_aep->rgb_fg_color >= 0) {
      new_en.rgb_fg_color = spell_aep->rgb_fg_color;
    }

    if (spell_aep->rgb_bg_color >= 0) {
      new_en.rgb_bg_color = spell_aep->rgb_bg_color;
    }

    if (spell_aep->rgb_sp_color >= 0) {
      new_en.rgb_sp_color = spell_aep->rgb_sp_color;
    }
  }
  return get_attr_entry(&new_en);
}

attrentry_T *syn_cterm_attr2entry(int attr)
{
  attr -= ATTR_OFF;
  if (attr >= attr_table.ga_len)          /* did ":syntax clear" */
    return NULL;
  return &(ATTR_ENTRY(attr));
}

#define LIST_ATTR   1
#define LIST_STRING 2
#define LIST_INT    3

static void highlight_list_one(int id)
{
  struct hl_group     *sgp;
  int didh = FALSE;

  sgp = &HL_TABLE()[id - 1];        /* index is ID minus one */

  didh = highlight_list_arg(id, didh, LIST_ATTR,
      sgp->sg_cterm, NULL, "cterm");
  didh = highlight_list_arg(id, didh, LIST_INT,
      sgp->sg_cterm_fg, NULL, "ctermfg");
  didh = highlight_list_arg(id, didh, LIST_INT,
      sgp->sg_cterm_bg, NULL, "ctermbg");

  didh = highlight_list_arg(id, didh, LIST_ATTR,
      sgp->sg_gui, NULL, "gui");
  didh = highlight_list_arg(id, didh, LIST_STRING,
      0, sgp->sg_rgb_fg_name, "guifg");
  didh = highlight_list_arg(id, didh, LIST_STRING,
      0, sgp->sg_rgb_bg_name, "guibg");
  didh = highlight_list_arg(id, didh, LIST_STRING,
                            0, sgp->sg_rgb_sp_name, "guisp");

  if (sgp->sg_link && !got_int) {
    (void)syn_list_header(didh, 9999, id);
    didh = true;
    msg_puts_attr("links to", hl_attr(HLF_D));
    msg_putchar(' ');
    msg_outtrans(HL_TABLE()[HL_TABLE()[id - 1].sg_link - 1].sg_name);
  }

  if (!didh)
    highlight_list_arg(id, didh, LIST_STRING, 0, (char_u *)"cleared", "");
  if (p_verbose > 0)
    last_set_msg(sgp->sg_scriptID);
}

static int highlight_list_arg(int id, int didh, int type, int iarg, char_u *sarg, char *name)
{
  char_u buf[100];
  char_u      *ts;
  int i;

  if (got_int)
    return FALSE;
  if (type == LIST_STRING ? (sarg != NULL) : (iarg != 0)) {
    ts = buf;
    if (type == LIST_INT)
      sprintf((char *)buf, "%d", iarg - 1);
    else if (type == LIST_STRING)
      ts = sarg;
    else {   /* type == LIST_ATTR */
      buf[0] = NUL;
      for (i = 0; hl_attr_table[i] != 0; ++i) {
        if (iarg & hl_attr_table[i]) {
          if (buf[0] != NUL)
            xstrlcat((char *)buf, ",", 100);
          xstrlcat((char *)buf, hl_name_table[i], 100);
          iarg &= ~hl_attr_table[i];                /* don't want "inverse" */
        }
      }
    }

    (void)syn_list_header(didh,
        (int)(vim_strsize(ts) + STRLEN(name) + 1), id);
    didh = TRUE;
    if (!got_int) {
      if (*name != NUL) {
        MSG_PUTS_ATTR(name, hl_attr(HLF_D));
        MSG_PUTS_ATTR("=", hl_attr(HLF_D));
      }
      msg_outtrans(ts);
    }
  }
  return didh;
}

/// Check whether highlight group has attribute
///
/// @param[in]  id  Highlight group to check.
/// @param[in]  flag  Attribute to check.
/// @param[in]  modec  'g' for GUI, 'c' for term.
///
/// @return "1" if highlight group has attribute, NULL otherwise.
const char *highlight_has_attr(const int id, const int flag, const int modec)
  FUNC_ATTR_WARN_UNUSED_RESULT FUNC_ATTR_PURE
{
  int attr;

  if (id <= 0 || id > highlight_ga.ga_len) {
    return NULL;
  }

  if (modec == 'g') {
    attr = HL_TABLE()[id - 1].sg_gui;
  } else {
    attr = HL_TABLE()[id - 1].sg_cterm;
  }

  return (attr & flag) ? "1" : NULL;
}

/// Return color name of the given highlight group
///
/// @param[in]  id  Highlight group to work with.
/// @param[in]  what  What to return: one of "font", "fg", "bg", "sp", "fg#",
///                   "bg#" or "sp#".
/// @param[in]  modec  'g' for GUI, 'c' for cterm and 't' for term.
///
/// @return color name, possibly in a static buffer. Buffer will be overwritten
///         on next highlight_color() call. May return NULL.
const char *highlight_color(const int id, const char *const what,
                            const int modec)
  FUNC_ATTR_WARN_UNUSED_RESULT FUNC_ATTR_NONNULL_ALL
{
  static char name[20];
  int n;
  bool fg = false;
  bool sp = false;
  bool font = false;

  if (id <= 0 || id > highlight_ga.ga_len) {
    return NULL;
  }

  if (TOLOWER_ASC(what[0]) == 'f' && TOLOWER_ASC(what[1]) == 'g') {
    fg = true;
  } else if (TOLOWER_ASC(what[0]) == 'f' && TOLOWER_ASC(what[1]) == 'o'
             && TOLOWER_ASC(what[2]) == 'n' && TOLOWER_ASC(what[3]) == 't') {
    font = true;
  } else if (TOLOWER_ASC(what[0]) == 's' && TOLOWER_ASC(what[1]) == 'p') {
    sp = true;
  } else if (!(TOLOWER_ASC(what[0]) == 'b' && TOLOWER_ASC(what[1]) == 'g')) {
    return NULL;
  }
  if (modec == 'g') {
    if (what[2] == '#' && ui_rgb_attached()) {
      if (fg) {
          n = HL_TABLE()[id - 1].sg_rgb_fg;
      } else if (sp) {
          n = HL_TABLE()[id - 1].sg_rgb_sp;
      } else {
          n = HL_TABLE()[id - 1].sg_rgb_bg;
      }
      if (n < 0 || n > 0xffffff) {
        return NULL;
      }
      snprintf(name, sizeof(name), "#%06x", n);
      return name;
    }
    if (fg) {
      return (const char *)HL_TABLE()[id - 1].sg_rgb_fg_name;
    }
    if (sp) {
      return (const char *)HL_TABLE()[id - 1].sg_rgb_sp_name;
    }
    return (const char *)HL_TABLE()[id - 1].sg_rgb_bg_name;
  }
  if (font || sp) {
    return NULL;
  }
  if (modec == 'c') {
    if (fg) {
      n = HL_TABLE()[id - 1].sg_cterm_fg - 1;
    } else {
      n = HL_TABLE()[id - 1].sg_cterm_bg - 1;
    }
    if (n < 0) {
      return NULL;
    }
    snprintf(name, sizeof(name), "%d", n);
    return name;
  }
  // term doesn't have color.
  return NULL;
}

/*
 * Output the syntax list header.
 * Return TRUE when started a new line.
 */
static int 
syn_list_header (
    int did_header,                 /* did header already */
    int outlen,                     /* length of string that comes */
    int id                         /* highlight group id */
)
{
  int endcol = 19;
  int newline = TRUE;

  if (!did_header) {
    msg_putchar('\n');
    if (got_int)
      return TRUE;
    msg_outtrans(HL_TABLE()[id - 1].sg_name);
    endcol = 15;
  } else if (msg_col + outlen + 1 >= Columns)   {
    msg_putchar('\n');
    if (got_int)
      return TRUE;
  } else {
    if (msg_col >= endcol)      /* wrap around is like starting a new line */
      newline = FALSE;
  }

  if (msg_col >= endcol)        /* output at least one space */
    endcol = msg_col + 1;
  if (Columns <= endcol)        /* avoid hang for tiny window */
    endcol = Columns - 1;

  msg_advance(endcol);

  /* Show "xxx" with the attributes. */
  if (!did_header) {
    msg_puts_attr("xxx", syn_id2attr(id));
    msg_putchar(' ');
  }

  return newline;
}

/*
 * Set the attribute numbers for a highlight group.
 * Called after one of the attributes has changed.
 */
static void 
set_hl_attr (
    int idx                    /* index in array */
)
{
  attrentry_T at_en;
  struct hl_group     *sgp = HL_TABLE() + idx;

  /* The "Normal" group doesn't need an attribute number */
  if (sgp->sg_name_u != NULL && STRCMP(sgp->sg_name_u, "NORMAL") == 0)
    return;

  at_en.cterm_ae_attr = sgp->sg_cterm;
  at_en.cterm_fg_color = sgp->sg_cterm_fg;
  at_en.cterm_bg_color = sgp->sg_cterm_bg;
  at_en.rgb_ae_attr = sgp->sg_gui;
  // FIXME(tarruda): The "unset value" for rgb is -1, but since hlgroup is
  // initialized with 0(by garray functions), check for sg_rgb_{f,b}g_name
  // before setting attr_entry->{f,g}g_color to a other than -1
  at_en.rgb_fg_color = sgp->sg_rgb_fg_name ? sgp->sg_rgb_fg : -1;
  at_en.rgb_bg_color = sgp->sg_rgb_bg_name ? sgp->sg_rgb_bg : -1;
  at_en.rgb_sp_color = sgp->sg_rgb_sp_name ? sgp->sg_rgb_sp : -1;

  if (at_en.cterm_fg_color != 0 || at_en.cterm_bg_color != 0
      || at_en.rgb_fg_color != -1 || at_en.rgb_bg_color != -1
      || at_en.rgb_sp_color != -1 || at_en.cterm_ae_attr != 0
      || at_en.rgb_ae_attr != 0) {
    sgp->sg_attr = get_attr_entry(&at_en);
  } else {
    // If all the fields are cleared, clear the attr field back to default value
    sgp->sg_attr = 0;
  }
}

/*
 * Lookup a highlight group name and return it's ID.
 * If it is not found, 0 is returned.
 */
int syn_name2id(const char_u *name)
{
  int i;
  char_u name_u[200];

  /* Avoid using stricmp() too much, it's slow on some systems */
  /* Avoid alloc()/free(), these are slow too.  ID names over 200 chars
   * don't deserve to be found! */
  STRLCPY(name_u, name, 200);
  vim_strup(name_u);
  for (i = highlight_ga.ga_len; --i >= 0; )
    if (HL_TABLE()[i].sg_name_u != NULL
        && STRCMP(name_u, HL_TABLE()[i].sg_name_u) == 0)
      break;
  return i + 1;
}

/*
 * Return TRUE if highlight group "name" exists.
 */
int highlight_exists(const char_u *name)
{
  return syn_name2id(name) > 0;
}

/*
 * Return the name of highlight group "id".
 * When not a valid ID return an empty string.
 */
char_u *syn_id2name(int id)
{
  if (id <= 0 || id > highlight_ga.ga_len)
    return (char_u *)"";
  return HL_TABLE()[id - 1].sg_name;
}

/*
 * Like syn_name2id(), but take a pointer + length argument.
 */
int syn_namen2id(char_u *linep, int len)
{
  char_u *name = vim_strnsave(linep, len);
  int id = syn_name2id(name);
  xfree(name);

  return id;
}

/// Find highlight group name in the table and return it's ID.
/// If it doesn't exist yet, a new entry is created.
///
/// @param pp Highlight group name
/// @param len length of \p pp
///
/// @return 0 for failure else the id of the group
int syn_check_group(char_u *pp, int len)
{
  char_u  *name = vim_strnsave(pp, len);
  int id = syn_name2id(name);
  if (id == 0) {  // doesn't exist yet
    id = syn_add_group(name);
  } else {
    xfree(name);
  }
  return id;
}

/*
 * Add new highlight group and return it's ID.
 * "name" must be an allocated string, it will be consumed.
 * Return 0 for failure.
 */
static int syn_add_group(char_u *name)
{
  char_u      *p;

  /* Check that the name is ASCII letters, digits and underscore. */
  for (p = name; *p != NUL; ++p) {
    if (!vim_isprintc(*p)) {
      EMSG(_("E669: Unprintable character in group name"));
      xfree(name);
      return 0;
    } else if (!ASCII_ISALNUM(*p) && *p != '_')   {
      /* This is an error, but since there previously was no check only
       * give a warning. */
      msg_source(hl_attr(HLF_W));
      MSG(_("W18: Invalid character in group name"));
      break;
    }
  }

  /*
   * First call for this growarray: init growing array.
   */
  if (highlight_ga.ga_data == NULL) {
    highlight_ga.ga_itemsize = sizeof(struct hl_group);
    ga_set_growsize(&highlight_ga, 10);
  }

  if (highlight_ga.ga_len >= MAX_HL_ID) {
    EMSG(_("E849: Too many highlight and syntax groups"));
    xfree(name);
    return 0;
  }

  // Append another syntax_highlight entry.
  struct hl_group* hlgp = GA_APPEND_VIA_PTR(struct hl_group, &highlight_ga);
  memset(hlgp, 0, sizeof(*hlgp));
  hlgp->sg_name = name;
  hlgp->sg_name_u = vim_strsave_up(name);

  return highlight_ga.ga_len;               /* ID is index plus one */
}

/*
 * When, just after calling syn_add_group(), an error is discovered, this
 * function deletes the new name.
 */
static void syn_unadd_group(void)
{
  --highlight_ga.ga_len;
  xfree(HL_TABLE()[highlight_ga.ga_len].sg_name);
  xfree(HL_TABLE()[highlight_ga.ga_len].sg_name_u);
}

/*
 * Translate a group ID to highlight attributes.
 */
int syn_id2attr(int hl_id)
{
  struct hl_group     *sgp;

  hl_id = syn_get_final_id(hl_id);
  sgp = &HL_TABLE()[hl_id - 1];             /* index is ID minus one */
  return sgp->sg_attr;
}


/*
 * Translate a group ID to the final group ID (following links).
 */
int syn_get_final_id(int hl_id)
{
  int count;
  struct hl_group     *sgp;

  if (hl_id > highlight_ga.ga_len || hl_id < 1)
    return 0;                           /* Can be called from eval!! */

  /*
   * Follow links until there is no more.
   * Look out for loops!  Break after 100 links.
   */
  for (count = 100; --count >= 0; ) {
    sgp = &HL_TABLE()[hl_id - 1];           /* index is ID minus one */
    if (sgp->sg_link == 0 || sgp->sg_link > highlight_ga.ga_len)
      break;
    hl_id = sgp->sg_link;
  }

  return hl_id;
}

/// Refresh the color attributes of all highlight groups.
static void highlight_attr_set_all(void)
{
  for (int idx = 0; idx < highlight_ga.ga_len; idx++) {
    struct hl_group *sgp = &HL_TABLE()[idx];
    if (sgp->sg_rgb_bg_name != NULL) {
      sgp->sg_rgb_bg = name_to_color(sgp->sg_rgb_bg_name);
    }
    if (sgp->sg_rgb_fg_name != NULL) {
      sgp->sg_rgb_fg = name_to_color(sgp->sg_rgb_fg_name);
    }
    if (sgp->sg_rgb_sp_name != NULL) {
      sgp->sg_rgb_sp = name_to_color(sgp->sg_rgb_sp_name);
    }
    set_hl_attr(idx);
  }
}

/*
 * Translate the 'highlight' option into attributes in highlight_attr[] and
 * set up the user highlights User1..9. A set of
 * corresponding highlights to use on top of HLF_SNC is computed.
 * Called only when the 'highlight' option has been changed and upon first
 * screen redraw after any :highlight command.
 * Return FAIL when an invalid flag is found in 'highlight'.  OK otherwise.
 */
int highlight_changed(void)
{
  int hlf;
  int i;
  char_u      *p;
  int attr;
  char_u      *end;
  int id;
  char_u userhl[10];
  int id_SNC = -1;
  int id_S = -1;
  int hlcnt;
  static int hl_flags[HLF_COUNT] = HL_FLAGS;

  need_highlight_changed = FALSE;

  /*
   * Clear all attributes.
   */
  for (hlf = 0; hlf < (int)HLF_COUNT; ++hlf)
    highlight_attr[hlf] = 0;

  /*
   * First set all attributes to their default value.
   * Then use the attributes from the 'highlight' option.
   */
  for (i = 0; i < 2; ++i) {
    if (i)
      p = p_hl;
    else
      p = get_highlight_default();
    if (p == NULL)          /* just in case */
      continue;

    while (*p) {
      for (hlf = 0; hlf < (int)HLF_COUNT; ++hlf)
        if (hl_flags[hlf] == *p)
          break;
      ++p;
      if (hlf == (int)HLF_COUNT || *p == NUL)
        return FAIL;

      /*
       * Allow several hl_flags to be combined, like "bu" for
       * bold-underlined.
       */
      attr = 0;
      bool colon = false;
      for (; *p && *p != ','; ++p) {  // parse upto comma
        if (ascii_iswhite(*p)) {  // ignore white space
          continue;
        }

        if (colon)          /* Combination with ':' is not allowed. */
          return FAIL;

        switch (*p) {
        case 'b':   attr |= HL_BOLD;
          break;
        case 'i':   attr |= HL_ITALIC;
          break;
        case '-':
        case 'n':                                   /* no highlighting */
          break;
        case 'r':   attr |= HL_INVERSE;
          break;
        case 's':   attr |= HL_STANDOUT;
          break;
        case 'u':   attr |= HL_UNDERLINE;
          break;
        case 'c':   attr |= HL_UNDERCURL;
          break;
        case ':':   ++p;                            /* highlight group name */
          if (attr || *p == NUL)                         /* no combinations */
            return FAIL;
          colon = true;
          end = vim_strchr(p, ',');
          if (end == NULL)
            end = p + STRLEN(p);
          id = syn_check_group(p, (int)(end - p));
          if (id == 0)
            return FAIL;
          attr = syn_id2attr(id);
          p = end - 1;
          if (hlf == (int)HLF_SNC)
            id_SNC = syn_get_final_id(id);
          else if (hlf == (int)HLF_S)
            id_S = syn_get_final_id(id);
          break;
        default:    return FAIL;
        }
      }
      highlight_attr[hlf] = attr;

      p = skip_to_option_part(p);           /* skip comma and spaces */
    }
  }

  /* Setup the user highlights
   *
   * Temporarily  utilize 10 more hl entries.  Have to be in there
   * simultaneously in case of table overflows in get_attr_entry()
   */
  ga_grow(&highlight_ga, 10);
  hlcnt = highlight_ga.ga_len;
  if (id_S == 0) {  /* Make sure id_S is always valid to simplify code below */
    memset(&HL_TABLE()[hlcnt + 9], 0, sizeof(struct hl_group));
    id_S = hlcnt + 10;
  }
  for (int i = 0; i < 9; i++) {
    sprintf((char *)userhl, "User%d", i + 1);
    id = syn_name2id(userhl);
    if (id == 0) {
      highlight_user[i] = 0;
      highlight_stlnc[i] = 0;
    } else {
      struct hl_group *hlt = HL_TABLE();

      highlight_user[i] = syn_id2attr(id);
      if (id_SNC == 0) {
        memset(&hlt[hlcnt + i], 0, sizeof(struct hl_group));
        hlt[hlcnt + i].sg_cterm = highlight_attr[HLF_SNC];
        hlt[hlcnt + i].sg_gui = highlight_attr[HLF_SNC];
      } else
        memmove(&hlt[hlcnt + i],
            &hlt[id_SNC - 1],
            sizeof(struct hl_group));
      hlt[hlcnt + i].sg_link = 0;

      /* Apply difference between UserX and HLF_S to HLF_SNC */
      hlt[hlcnt + i].sg_cterm ^= hlt[id - 1].sg_cterm ^ hlt[id_S - 1].sg_cterm;

      if (hlt[id - 1].sg_cterm_fg != hlt[id_S - 1].sg_cterm_fg) {
        hlt[hlcnt + i].sg_cterm_fg = hlt[id - 1].sg_cterm_fg;
      }

      if (hlt[id - 1].sg_cterm_bg != hlt[id_S - 1].sg_cterm_bg) {
        hlt[hlcnt + i].sg_cterm_bg = hlt[id - 1].sg_cterm_bg;
      }

      hlt[hlcnt + i].sg_gui ^= hlt[id - 1].sg_gui ^ hlt[id_S - 1].sg_gui;

      if (hlt[id - 1].sg_rgb_fg != hlt[id_S - 1].sg_rgb_fg) {
        hlt[hlcnt + i].sg_rgb_fg = hlt[id - 1].sg_rgb_fg;
      }

      if (hlt[id - 1].sg_rgb_bg != hlt[id_S - 1].sg_rgb_bg) {
        hlt[hlcnt + i].sg_rgb_bg = hlt[id - 1].sg_rgb_bg;
      }

      if (hlt[id - 1].sg_rgb_sp != hlt[id_S - 1].sg_rgb_sp) {
        hlt[hlcnt + i].sg_rgb_sp = hlt[id - 1].sg_rgb_sp;
      }

      highlight_ga.ga_len = hlcnt + i + 1;
      set_hl_attr(hlcnt + i);           /* At long last we can apply */
      highlight_stlnc[i] = syn_id2attr(hlcnt + i + 1);
    }
  }
  highlight_ga.ga_len = hlcnt;

  return OK;
}


/*
 * Handle command line completion for :highlight command.
 */
void set_context_in_highlight_cmd(expand_T *xp, const char *arg)
{
  // Default: expand group names.
  xp->xp_context = EXPAND_HIGHLIGHT;
  xp->xp_pattern = (char_u *)arg;
  include_link = 2;
  include_default = 1;

  /* (part of) subcommand already typed */
  if (*arg != NUL) {
    const char *p = (const char *)skiptowhite((const char_u *)arg);
    if (*p != NUL) {  // Past "default" or group name.
      include_default = 0;
      if (strncmp("default", arg, p - arg) == 0) {
        arg = (const char *)skipwhite((const char_u *)p);
        xp->xp_pattern = (char_u *)arg;
        p = (const char *)skiptowhite((const char_u *)arg);
      }
      if (*p != NUL) {                          /* past group name */
        include_link = 0;
        if (arg[1] == 'i' && arg[0] == 'N') {
          highlight_list();
        }
        if (strncmp("link", arg, p - arg) == 0
            || strncmp("clear", arg, p - arg) == 0) {
          xp->xp_pattern = skipwhite((const char_u *)p);
          p = (const char *)skiptowhite(xp->xp_pattern);
          if (*p != NUL) {  // Past first group name.
            xp->xp_pattern = skipwhite((const char_u *)p);
            p = (const char *)skiptowhite(xp->xp_pattern);
          }
        }
        if (*p != NUL) {  // Past group name(s).
          xp->xp_context = EXPAND_NOTHING;
        }
      }
    }
  }
}

/*
 * List highlighting matches in a nice way.
 */
static void highlight_list(void)
{
  int i;

  for (i = 10; --i >= 0; )
    highlight_list_two(i, hl_attr(HLF_D));
  for (i = 40; --i >= 0; )
    highlight_list_two(99, 0);
}

static void highlight_list_two(int cnt, int attr)
{
  msg_puts_attr(&("N \bI \b!  \b"[cnt / 11]), attr);
  msg_clr_eos();
  ui_flush();
  os_delay(cnt == 99 ? 40L : (long)cnt * 50L, false);
}


/*
 * Function given to ExpandGeneric() to obtain the list of group names.
 * Also used for synIDattr() function.
 */
const char *get_highlight_name(expand_T *const xp, const int idx)
  FUNC_ATTR_WARN_UNUSED_RESULT
{
  // TODO(justinmk): 'xp' is unused
  if (idx == highlight_ga.ga_len && include_none != 0) {
    return "none";
  } else if (idx == highlight_ga.ga_len + include_none
             && include_default != 0) {
    return "default";
  } else if (idx == highlight_ga.ga_len + include_none + include_default
             && include_link != 0) {
    return "link";
  } else if (idx == highlight_ga.ga_len + include_none + include_default + 1
             && include_link != 0) {
    return "clear";
  } else if (idx < 0 || idx >= highlight_ga.ga_len) {
    return NULL;
  }
  return (const char *)HL_TABLE()[idx].sg_name;
}

color_name_table_T color_name_table[] = {
  // Colors from rgb.txt
  { "AliceBlue", RGB(0xf0, 0xf8, 0xff) },
  { "AntiqueWhite", RGB(0xfa, 0xeb, 0xd7) },
  { "AntiqueWhite1", RGB(0xff, 0xef, 0xdb) },
  { "AntiqueWhite2", RGB(0xee, 0xdf, 0xcc) },
  { "AntiqueWhite3", RGB(0xcd, 0xc0, 0xb0) },
  { "AntiqueWhite4", RGB(0x8b, 0x83, 0x78) },
  { "Aqua", RGB(0x00, 0xff, 0xff) },
  { "Aquamarine", RGB(0x7f, 0xff, 0xd4) },
  { "Aquamarine1", RGB(0x7f, 0xff, 0xd4) },
  { "Aquamarine2", RGB(0x76, 0xee, 0xc6) },
  { "Aquamarine3", RGB(0x66, 0xcd, 0xaa) },
  { "Aquamarine4", RGB(0x45, 0x8b, 0x74) },
  { "Azure", RGB(0xf0, 0xff, 0xff) },
  { "Azure1", RGB(0xf0, 0xff, 0xff) },
  { "Azure2", RGB(0xe0, 0xee, 0xee) },
  { "Azure3", RGB(0xc1, 0xcd, 0xcd) },
  { "Azure4", RGB(0x83, 0x8b, 0x8b) },
  { "Beige", RGB(0xf5, 0xf5, 0xdc) },
  { "Bisque", RGB(0xff, 0xe4, 0xc4) },
  { "Bisque1", RGB(0xff, 0xe4, 0xc4) },
  { "Bisque2", RGB(0xee, 0xd5, 0xb7) },
  { "Bisque3", RGB(0xcd, 0xb7, 0x9e) },
  { "Bisque4", RGB(0x8b, 0x7d, 0x6b) },
  { "Black", RGB(0x00, 0x00, 0x00) },
  { "BlanchedAlmond", RGB(0xff, 0xeb, 0xcd) },
  { "Blue", RGB(0x00, 0x00, 0xff) },
  { "Blue1", RGB(0x0, 0x0, 0xff) },
  { "Blue2", RGB(0x0, 0x0, 0xee) },
  { "Blue3", RGB(0x0, 0x0, 0xcd) },
  { "Blue4", RGB(0x0, 0x0, 0x8b) },
  { "BlueViolet", RGB(0x8a, 0x2b, 0xe2) },
  { "Brown", RGB(0xa5, 0x2a, 0x2a) },
  { "Brown1", RGB(0xff, 0x40, 0x40) },
  { "Brown2", RGB(0xee, 0x3b, 0x3b) },
  { "Brown3", RGB(0xcd, 0x33, 0x33) },
  { "Brown4", RGB(0x8b, 0x23, 0x23) },
  { "BurlyWood", RGB(0xde, 0xb8, 0x87) },
  { "Burlywood1", RGB(0xff, 0xd3, 0x9b) },
  { "Burlywood2", RGB(0xee, 0xc5, 0x91) },
  { "Burlywood3", RGB(0xcd, 0xaa, 0x7d) },
  { "Burlywood4", RGB(0x8b, 0x73, 0x55) },
  { "CadetBlue", RGB(0x5f, 0x9e, 0xa0) },
  { "CadetBlue1", RGB(0x98, 0xf5, 0xff) },
  { "CadetBlue2", RGB(0x8e, 0xe5, 0xee) },
  { "CadetBlue3", RGB(0x7a, 0xc5, 0xcd) },
  { "CadetBlue4", RGB(0x53, 0x86, 0x8b) },
  { "ChartReuse", RGB(0x7f, 0xff, 0x00) },
  { "Chartreuse1", RGB(0x7f, 0xff, 0x0) },
  { "Chartreuse2", RGB(0x76, 0xee, 0x0) },
  { "Chartreuse3", RGB(0x66, 0xcd, 0x0) },
  { "Chartreuse4", RGB(0x45, 0x8b, 0x0) },
  { "Chocolate", RGB(0xd2, 0x69, 0x1e) },
  { "Chocolate1", RGB(0xff, 0x7f, 0x24) },
  { "Chocolate2", RGB(0xee, 0x76, 0x21) },
  { "Chocolate3", RGB(0xcd, 0x66, 0x1d) },
  { "Chocolate4", RGB(0x8b, 0x45, 0x13) },
  { "Coral", RGB(0xff, 0x7f, 0x50) },
  { "Coral1", RGB(0xff, 0x72, 0x56) },
  { "Coral2", RGB(0xee, 0x6a, 0x50) },
  { "Coral3", RGB(0xcd, 0x5b, 0x45) },
  { "Coral4", RGB(0x8b, 0x3e, 0x2f) },
  { "CornFlowerBlue", RGB(0x64, 0x95, 0xed) },
  { "Cornsilk", RGB(0xff, 0xf8, 0xdc) },
  { "Cornsilk1", RGB(0xff, 0xf8, 0xdc) },
  { "Cornsilk2", RGB(0xee, 0xe8, 0xcd) },
  { "Cornsilk3", RGB(0xcd, 0xc8, 0xb1) },
  { "Cornsilk4", RGB(0x8b, 0x88, 0x78) },
  { "Crimson", RGB(0xdc, 0x14, 0x3c) },
  { "Cyan", RGB(0x00, 0xff, 0xff) },
  { "Cyan1", RGB(0x0, 0xff, 0xff) },
  { "Cyan2", RGB(0x0, 0xee, 0xee) },
  { "Cyan3", RGB(0x0, 0xcd, 0xcd) },
  { "Cyan4", RGB(0x0, 0x8b, 0x8b) },
  { "DarkBlue", RGB(0x00, 0x00, 0x8b) },
  { "DarkCyan", RGB(0x00, 0x8b, 0x8b) },
  { "DarkGoldenRod", RGB(0xb8, 0x86, 0x0b) },
  { "DarkGoldenrod1", RGB(0xff, 0xb9, 0xf) },
  { "DarkGoldenrod2", RGB(0xee, 0xad, 0xe) },
  { "DarkGoldenrod3", RGB(0xcd, 0x95, 0xc) },
  { "DarkGoldenrod4", RGB(0x8b, 0x65, 0x8) },
  { "DarkGray", RGB(0xa9, 0xa9, 0xa9) },
  { "DarkGreen", RGB(0x00, 0x64, 0x00) },
  { "DarkGrey", RGB(0xa9, 0xa9, 0xa9) },
  { "DarkKhaki", RGB(0xbd, 0xb7, 0x6b) },
  { "DarkMagenta", RGB(0x8b, 0x00, 0x8b) },
  { "DarkOliveGreen", RGB(0x55, 0x6b, 0x2f) },
  { "DarkOliveGreen1", RGB(0xca, 0xff, 0x70) },
  { "DarkOliveGreen2", RGB(0xbc, 0xee, 0x68) },
  { "DarkOliveGreen3", RGB(0xa2, 0xcd, 0x5a) },
  { "DarkOliveGreen4", RGB(0x6e, 0x8b, 0x3d) },
  { "DarkOrange", RGB(0xff, 0x8c, 0x00) },
  { "DarkOrange1", RGB(0xff, 0x7f, 0x0) },
  { "DarkOrange2", RGB(0xee, 0x76, 0x0) },
  { "DarkOrange3", RGB(0xcd, 0x66, 0x0) },
  { "DarkOrange4", RGB(0x8b, 0x45, 0x0) },
  { "DarkOrchid", RGB(0x99, 0x32, 0xcc) },
  { "DarkOrchid1", RGB(0xbf, 0x3e, 0xff) },
  { "DarkOrchid2", RGB(0xb2, 0x3a, 0xee) },
  { "DarkOrchid3", RGB(0x9a, 0x32, 0xcd) },
  { "DarkOrchid4", RGB(0x68, 0x22, 0x8b) },
  { "DarkRed", RGB(0x8b, 0x00, 0x00) },
  { "DarkSalmon", RGB(0xe9, 0x96, 0x7a) },
  { "DarkSeaGreen", RGB(0x8f, 0xbc, 0x8f) },
  { "DarkSeaGreen1", RGB(0xc1, 0xff, 0xc1) },
  { "DarkSeaGreen2", RGB(0xb4, 0xee, 0xb4) },
  { "DarkSeaGreen3", RGB(0x9b, 0xcd, 0x9b) },
  { "DarkSeaGreen4", RGB(0x69, 0x8b, 0x69) },
  { "DarkSlateBlue", RGB(0x48, 0x3d, 0x8b) },
  { "DarkSlateGray", RGB(0x2f, 0x4f, 0x4f) },
  { "DarkSlateGray1", RGB(0x97, 0xff, 0xff) },
  { "DarkSlateGray2", RGB(0x8d, 0xee, 0xee) },
  { "DarkSlateGray3", RGB(0x79, 0xcd, 0xcd) },
  { "DarkSlateGray4", RGB(0x52, 0x8b, 0x8b) },
  { "DarkSlateGrey", RGB(0x2f, 0x4f, 0x4f) },
  { "DarkTurquoise", RGB(0x00, 0xce, 0xd1) },
  { "DarkViolet", RGB(0x94, 0x00, 0xd3) },
  { "DarkYellow", RGB(0xbb, 0xbb, 0x00) },
  { "DeepPink", RGB(0xff, 0x14, 0x93) },
  { "DeepPink1", RGB(0xff, 0x14, 0x93) },
  { "DeepPink2", RGB(0xee, 0x12, 0x89) },
  { "DeepPink3", RGB(0xcd, 0x10, 0x76) },
  { "DeepPink4", RGB(0x8b, 0xa, 0x50) },
  { "DeepSkyBlue", RGB(0x00, 0xbf, 0xff) },
  { "DeepSkyBlue1", RGB(0x0, 0xbf, 0xff) },
  { "DeepSkyBlue2", RGB(0x0, 0xb2, 0xee) },
  { "DeepSkyBlue3", RGB(0x0, 0x9a, 0xcd) },
  { "DeepSkyBlue4", RGB(0x0, 0x68, 0x8b) },
  { "DimGray", RGB(0x69, 0x69, 0x69) },
  { "DimGrey", RGB(0x69, 0x69, 0x69) },
  { "DodgerBlue", RGB(0x1e, 0x90, 0xff) },
  { "DodgerBlue1", RGB(0x1e, 0x90, 0xff) },
  { "DodgerBlue2", RGB(0x1c, 0x86, 0xee) },
  { "DodgerBlue3", RGB(0x18, 0x74, 0xcd) },
  { "DodgerBlue4", RGB(0x10, 0x4e, 0x8b) },
  { "Firebrick", RGB(0xb2, 0x22, 0x22) },
  { "Firebrick1", RGB(0xff, 0x30, 0x30) },
  { "Firebrick2", RGB(0xee, 0x2c, 0x2c) },
  { "Firebrick3", RGB(0xcd, 0x26, 0x26) },
  { "Firebrick4", RGB(0x8b, 0x1a, 0x1a) },
  { "FloralWhite", RGB(0xff, 0xfa, 0xf0) },
  { "ForestGreen", RGB(0x22, 0x8b, 0x22) },
  { "Fuchsia", RGB(0xff, 0x00, 0xff) },
  { "Gainsboro", RGB(0xdc, 0xdc, 0xdc) },
  { "GhostWhite", RGB(0xf8, 0xf8, 0xff) },
  { "Gold", RGB(0xff, 0xd7, 0x00) },
  { "Gold1", RGB(0xff, 0xd7, 0x0) },
  { "Gold2", RGB(0xee, 0xc9, 0x0) },
  { "Gold3", RGB(0xcd, 0xad, 0x0) },
  { "Gold4", RGB(0x8b, 0x75, 0x0) },
  { "GoldenRod", RGB(0xda, 0xa5, 0x20) },
  { "Goldenrod1", RGB(0xff, 0xc1, 0x25) },
  { "Goldenrod2", RGB(0xee, 0xb4, 0x22) },
  { "Goldenrod3", RGB(0xcd, 0x9b, 0x1d) },
  { "Goldenrod4", RGB(0x8b, 0x69, 0x14) },
  { "Gray", RGB(0x80, 0x80, 0x80) },
  { "Gray0", RGB(0x0, 0x0, 0x0) },
  { "Gray1", RGB(0x3, 0x3, 0x3) },
  { "Gray10", RGB(0x1a, 0x1a, 0x1a) },
  { "Gray100", RGB(0xff, 0xff, 0xff) },
  { "Gray11", RGB(0x1c, 0x1c, 0x1c) },
  { "Gray12", RGB(0x1f, 0x1f, 0x1f) },
  { "Gray13", RGB(0x21, 0x21, 0x21) },
  { "Gray14", RGB(0x24, 0x24, 0x24) },
  { "Gray15", RGB(0x26, 0x26, 0x26) },
  { "Gray16", RGB(0x29, 0x29, 0x29) },
  { "Gray17", RGB(0x2b, 0x2b, 0x2b) },
  { "Gray18", RGB(0x2e, 0x2e, 0x2e) },
  { "Gray19", RGB(0x30, 0x30, 0x30) },
  { "Gray2", RGB(0x5, 0x5, 0x5) },
  { "Gray20", RGB(0x33, 0x33, 0x33) },
  { "Gray21", RGB(0x36, 0x36, 0x36) },
  { "Gray22", RGB(0x38, 0x38, 0x38) },
  { "Gray23", RGB(0x3b, 0x3b, 0x3b) },
  { "Gray24", RGB(0x3d, 0x3d, 0x3d) },
  { "Gray25", RGB(0x40, 0x40, 0x40) },
  { "Gray26", RGB(0x42, 0x42, 0x42) },
  { "Gray27", RGB(0x45, 0x45, 0x45) },
  { "Gray28", RGB(0x47, 0x47, 0x47) },
  { "Gray29", RGB(0x4a, 0x4a, 0x4a) },
  { "Gray3", RGB(0x8, 0x8, 0x8) },
  { "Gray30", RGB(0x4d, 0x4d, 0x4d) },
  { "Gray31", RGB(0x4f, 0x4f, 0x4f) },
  { "Gray32", RGB(0x52, 0x52, 0x52) },
  { "Gray33", RGB(0x54, 0x54, 0x54) },
  { "Gray34", RGB(0x57, 0x57, 0x57) },
  { "Gray35", RGB(0x59, 0x59, 0x59) },
  { "Gray36", RGB(0x5c, 0x5c, 0x5c) },
  { "Gray37", RGB(0x5e, 0x5e, 0x5e) },
  { "Gray38", RGB(0x61, 0x61, 0x61) },
  { "Gray39", RGB(0x63, 0x63, 0x63) },
  { "Gray4", RGB(0xa, 0xa, 0xa) },
  { "Gray40", RGB(0x66, 0x66, 0x66) },
  { "Gray41", RGB(0x69, 0x69, 0x69) },
  { "Gray42", RGB(0x6b, 0x6b, 0x6b) },
  { "Gray43", RGB(0x6e, 0x6e, 0x6e) },
  { "Gray44", RGB(0x70, 0x70, 0x70) },
  { "Gray45", RGB(0x73, 0x73, 0x73) },
  { "Gray46", RGB(0x75, 0x75, 0x75) },
  { "Gray47", RGB(0x78, 0x78, 0x78) },
  { "Gray48", RGB(0x7a, 0x7a, 0x7a) },
  { "Gray49", RGB(0x7d, 0x7d, 0x7d) },
  { "Gray5", RGB(0xd, 0xd, 0xd) },
  { "Gray50", RGB(0x7f, 0x7f, 0x7f) },
  { "Gray51", RGB(0x82, 0x82, 0x82) },
  { "Gray52", RGB(0x85, 0x85, 0x85) },
  { "Gray53", RGB(0x87, 0x87, 0x87) },
  { "Gray54", RGB(0x8a, 0x8a, 0x8a) },
  { "Gray55", RGB(0x8c, 0x8c, 0x8c) },
  { "Gray56", RGB(0x8f, 0x8f, 0x8f) },
  { "Gray57", RGB(0x91, 0x91, 0x91) },
  { "Gray58", RGB(0x94, 0x94, 0x94) },
  { "Gray59", RGB(0x96, 0x96, 0x96) },
  { "Gray6", RGB(0xf, 0xf, 0xf) },
  { "Gray60", RGB(0x99, 0x99, 0x99) },
  { "Gray61", RGB(0x9c, 0x9c, 0x9c) },
  { "Gray62", RGB(0x9e, 0x9e, 0x9e) },
  { "Gray63", RGB(0xa1, 0xa1, 0xa1) },
  { "Gray64", RGB(0xa3, 0xa3, 0xa3) },
  { "Gray65", RGB(0xa6, 0xa6, 0xa6) },
  { "Gray66", RGB(0xa8, 0xa8, 0xa8) },
  { "Gray67", RGB(0xab, 0xab, 0xab) },
  { "Gray68", RGB(0xad, 0xad, 0xad) },
  { "Gray69", RGB(0xb0, 0xb0, 0xb0) },
  { "Gray7", RGB(0x12, 0x12, 0x12) },
  { "Gray70", RGB(0xb3, 0xb3, 0xb3) },
  { "Gray71", RGB(0xb5, 0xb5, 0xb5) },
  { "Gray72", RGB(0xb8, 0xb8, 0xb8) },
  { "Gray73", RGB(0xba, 0xba, 0xba) },
  { "Gray74", RGB(0xbd, 0xbd, 0xbd) },
  { "Gray75", RGB(0xbf, 0xbf, 0xbf) },
  { "Gray76", RGB(0xc2, 0xc2, 0xc2) },
  { "Gray77", RGB(0xc4, 0xc4, 0xc4) },
  { "Gray78", RGB(0xc7, 0xc7, 0xc7) },
  { "Gray79", RGB(0xc9, 0xc9, 0xc9) },
  { "Gray8", RGB(0x14, 0x14, 0x14) },
  { "Gray80", RGB(0xcc, 0xcc, 0xcc) },
  { "Gray81", RGB(0xcf, 0xcf, 0xcf) },
  { "Gray82", RGB(0xd1, 0xd1, 0xd1) },
  { "Gray83", RGB(0xd4, 0xd4, 0xd4) },
  { "Gray84", RGB(0xd6, 0xd6, 0xd6) },
  { "Gray85", RGB(0xd9, 0xd9, 0xd9) },
  { "Gray86", RGB(0xdb, 0xdb, 0xdb) },
  { "Gray87", RGB(0xde, 0xde, 0xde) },
  { "Gray88", RGB(0xe0, 0xe0, 0xe0) },
  { "Gray89", RGB(0xe3, 0xe3, 0xe3) },
  { "Gray9", RGB(0x17, 0x17, 0x17) },
  { "Gray90", RGB(0xe5, 0xe5, 0xe5) },
  { "Gray91", RGB(0xe8, 0xe8, 0xe8) },
  { "Gray92", RGB(0xeb, 0xeb, 0xeb) },
  { "Gray93", RGB(0xed, 0xed, 0xed) },
  { "Gray94", RGB(0xf0, 0xf0, 0xf0) },
  { "Gray95", RGB(0xf2, 0xf2, 0xf2) },
  { "Gray96", RGB(0xf5, 0xf5, 0xf5) },
  { "Gray97", RGB(0xf7, 0xf7, 0xf7) },
  { "Gray98", RGB(0xfa, 0xfa, 0xfa) },
  { "Gray99", RGB(0xfc, 0xfc, 0xfc) },
  { "Green", RGB(0x00, 0x80, 0x00) },
  { "Green1", RGB(0x0, 0xff, 0x0) },
  { "Green2", RGB(0x0, 0xee, 0x0) },
  { "Green3", RGB(0x0, 0xcd, 0x0) },
  { "Green4", RGB(0x0, 0x8b, 0x0) },
  { "GreenYellow", RGB(0xad, 0xff, 0x2f) },
  { "Grey", RGB(0x80, 0x80, 0x80) },
  { "Grey0", RGB(0x0, 0x0, 0x0) },
  { "Grey1", RGB(0x3, 0x3, 0x3) },
  { "Grey10", RGB(0x1a, 0x1a, 0x1a) },
  { "Grey100", RGB(0xff, 0xff, 0xff) },
  { "Grey11", RGB(0x1c, 0x1c, 0x1c) },
  { "Grey12", RGB(0x1f, 0x1f, 0x1f) },
  { "Grey13", RGB(0x21, 0x21, 0x21) },
  { "Grey14", RGB(0x24, 0x24, 0x24) },
  { "Grey15", RGB(0x26, 0x26, 0x26) },
  { "Grey16", RGB(0x29, 0x29, 0x29) },
  { "Grey17", RGB(0x2b, 0x2b, 0x2b) },
  { "Grey18", RGB(0x2e, 0x2e, 0x2e) },
  { "Grey19", RGB(0x30, 0x30, 0x30) },
  { "Grey2", RGB(0x5, 0x5, 0x5) },
  { "Grey20", RGB(0x33, 0x33, 0x33) },
  { "Grey21", RGB(0x36, 0x36, 0x36) },
  { "Grey22", RGB(0x38, 0x38, 0x38) },
  { "Grey23", RGB(0x3b, 0x3b, 0x3b) },
  { "Grey24", RGB(0x3d, 0x3d, 0x3d) },
  { "Grey25", RGB(0x40, 0x40, 0x40) },
  { "Grey26", RGB(0x42, 0x42, 0x42) },
  { "Grey27", RGB(0x45, 0x45, 0x45) },
  { "Grey28", RGB(0x47, 0x47, 0x47) },
  { "Grey29", RGB(0x4a, 0x4a, 0x4a) },
  { "Grey3", RGB(0x8, 0x8, 0x8) },
  { "Grey30", RGB(0x4d, 0x4d, 0x4d) },
  { "Grey31", RGB(0x4f, 0x4f, 0x4f) },
  { "Grey32", RGB(0x52, 0x52, 0x52) },
  { "Grey33", RGB(0x54, 0x54, 0x54) },
  { "Grey34", RGB(0x57, 0x57, 0x57) },
  { "Grey35", RGB(0x59, 0x59, 0x59) },
  { "Grey36", RGB(0x5c, 0x5c, 0x5c) },
  { "Grey37", RGB(0x5e, 0x5e, 0x5e) },
  { "Grey38", RGB(0x61, 0x61, 0x61) },
  { "Grey39", RGB(0x63, 0x63, 0x63) },
  { "Grey4", RGB(0xa, 0xa, 0xa) },
  { "Grey40", RGB(0x66, 0x66, 0x66) },
  { "Grey41", RGB(0x69, 0x69, 0x69) },
  { "Grey42", RGB(0x6b, 0x6b, 0x6b) },
  { "Grey43", RGB(0x6e, 0x6e, 0x6e) },
  { "Grey44", RGB(0x70, 0x70, 0x70) },
  { "Grey45", RGB(0x73, 0x73, 0x73) },
  { "Grey46", RGB(0x75, 0x75, 0x75) },
  { "Grey47", RGB(0x78, 0x78, 0x78) },
  { "Grey48", RGB(0x7a, 0x7a, 0x7a) },
  { "Grey49", RGB(0x7d, 0x7d, 0x7d) },
  { "Grey5", RGB(0xd, 0xd, 0xd) },
  { "Grey50", RGB(0x7f, 0x7f, 0x7f) },
  { "Grey51", RGB(0x82, 0x82, 0x82) },
  { "Grey52", RGB(0x85, 0x85, 0x85) },
  { "Grey53", RGB(0x87, 0x87, 0x87) },
  { "Grey54", RGB(0x8a, 0x8a, 0x8a) },
  { "Grey55", RGB(0x8c, 0x8c, 0x8c) },
  { "Grey56", RGB(0x8f, 0x8f, 0x8f) },
  { "Grey57", RGB(0x91, 0x91, 0x91) },
  { "Grey58", RGB(0x94, 0x94, 0x94) },
  { "Grey59", RGB(0x96, 0x96, 0x96) },
  { "Grey6", RGB(0xf, 0xf, 0xf) },
  { "Grey60", RGB(0x99, 0x99, 0x99) },
  { "Grey61", RGB(0x9c, 0x9c, 0x9c) },
  { "Grey62", RGB(0x9e, 0x9e, 0x9e) },
  { "Grey63", RGB(0xa1, 0xa1, 0xa1) },
  { "Grey64", RGB(0xa3, 0xa3, 0xa3) },
  { "Grey65", RGB(0xa6, 0xa6, 0xa6) },
  { "Grey66", RGB(0xa8, 0xa8, 0xa8) },
  { "Grey67", RGB(0xab, 0xab, 0xab) },
  { "Grey68", RGB(0xad, 0xad, 0xad) },
  { "Grey69", RGB(0xb0, 0xb0, 0xb0) },
  { "Grey7", RGB(0x12, 0x12, 0x12) },
  { "Grey70", RGB(0xb3, 0xb3, 0xb3) },
  { "Grey71", RGB(0xb5, 0xb5, 0xb5) },
  { "Grey72", RGB(0xb8, 0xb8, 0xb8) },
  { "Grey73", RGB(0xba, 0xba, 0xba) },
  { "Grey74", RGB(0xbd, 0xbd, 0xbd) },
  { "Grey75", RGB(0xbf, 0xbf, 0xbf) },
  { "Grey76", RGB(0xc2, 0xc2, 0xc2) },
  { "Grey77", RGB(0xc4, 0xc4, 0xc4) },
  { "Grey78", RGB(0xc7, 0xc7, 0xc7) },
  { "Grey79", RGB(0xc9, 0xc9, 0xc9) },
  { "Grey8", RGB(0x14, 0x14, 0x14) },
  { "Grey80", RGB(0xcc, 0xcc, 0xcc) },
  { "Grey81", RGB(0xcf, 0xcf, 0xcf) },
  { "Grey82", RGB(0xd1, 0xd1, 0xd1) },
  { "Grey83", RGB(0xd4, 0xd4, 0xd4) },
  { "Grey84", RGB(0xd6, 0xd6, 0xd6) },
  { "Grey85", RGB(0xd9, 0xd9, 0xd9) },
  { "Grey86", RGB(0xdb, 0xdb, 0xdb) },
  { "Grey87", RGB(0xde, 0xde, 0xde) },
  { "Grey88", RGB(0xe0, 0xe0, 0xe0) },
  { "Grey89", RGB(0xe3, 0xe3, 0xe3) },
  { "Grey9", RGB(0x17, 0x17, 0x17) },
  { "Grey90", RGB(0xe5, 0xe5, 0xe5) },
  { "Grey91", RGB(0xe8, 0xe8, 0xe8) },
  { "Grey92", RGB(0xeb, 0xeb, 0xeb) },
  { "Grey93", RGB(0xed, 0xed, 0xed) },
  { "Grey94", RGB(0xf0, 0xf0, 0xf0) },
  { "Grey95", RGB(0xf2, 0xf2, 0xf2) },
  { "Grey96", RGB(0xf5, 0xf5, 0xf5) },
  { "Grey97", RGB(0xf7, 0xf7, 0xf7) },
  { "Grey98", RGB(0xfa, 0xfa, 0xfa) },
  { "Grey99", RGB(0xfc, 0xfc, 0xfc) },
  { "Honeydew", RGB(0xf0, 0xff, 0xf0) },
  { "Honeydew1", RGB(0xf0, 0xff, 0xf0) },
  { "Honeydew2", RGB(0xe0, 0xee, 0xe0) },
  { "Honeydew3", RGB(0xc1, 0xcd, 0xc1) },
  { "Honeydew4", RGB(0x83, 0x8b, 0x83) },
  { "HotPink", RGB(0xff, 0x69, 0xb4) },
  { "HotPink1", RGB(0xff, 0x6e, 0xb4) },
  { "HotPink2", RGB(0xee, 0x6a, 0xa7) },
  { "HotPink3", RGB(0xcd, 0x60, 0x90) },
  { "HotPink4", RGB(0x8b, 0x3a, 0x62) },
  { "IndianRed", RGB(0xcd, 0x5c, 0x5c) },
  { "IndianRed1", RGB(0xff, 0x6a, 0x6a) },
  { "IndianRed2", RGB(0xee, 0x63, 0x63) },
  { "IndianRed3", RGB(0xcd, 0x55, 0x55) },
  { "IndianRed4", RGB(0x8b, 0x3a, 0x3a) },
  { "Indigo", RGB(0x4b, 0x00, 0x82) },
  { "Ivory", RGB(0xff, 0xff, 0xf0) },
  { "Ivory1", RGB(0xff, 0xff, 0xf0) },
  { "Ivory2", RGB(0xee, 0xee, 0xe0) },
  { "Ivory3", RGB(0xcd, 0xcd, 0xc1) },
  { "Ivory4", RGB(0x8b, 0x8b, 0x83) },
  { "Khaki", RGB(0xf0, 0xe6, 0x8c) },
  { "Khaki1", RGB(0xff, 0xf6, 0x8f) },
  { "Khaki2", RGB(0xee, 0xe6, 0x85) },
  { "Khaki3", RGB(0xcd, 0xc6, 0x73) },
  { "Khaki4", RGB(0x8b, 0x86, 0x4e) },
  { "Lavender", RGB(0xe6, 0xe6, 0xfa) },
  { "LavenderBlush", RGB(0xff, 0xf0, 0xf5) },
  { "LavenderBlush1", RGB(0xff, 0xf0, 0xf5) },
  { "LavenderBlush2", RGB(0xee, 0xe0, 0xe5) },
  { "LavenderBlush3", RGB(0xcd, 0xc1, 0xc5) },
  { "LavenderBlush4", RGB(0x8b, 0x83, 0x86) },
  { "LawnGreen", RGB(0x7c, 0xfc, 0x00) },
  { "LemonChiffon", RGB(0xff, 0xfa, 0xcd) },
  { "LemonChiffon1", RGB(0xff, 0xfa, 0xcd) },
  { "LemonChiffon2", RGB(0xee, 0xe9, 0xbf) },
  { "LemonChiffon3", RGB(0xcd, 0xc9, 0xa5) },
  { "LemonChiffon4", RGB(0x8b, 0x89, 0x70) },
  { "LightBlue", RGB(0xad, 0xd8, 0xe6) },
  { "LightBlue1", RGB(0xbf, 0xef, 0xff) },
  { "LightBlue2", RGB(0xb2, 0xdf, 0xee) },
  { "LightBlue3", RGB(0x9a, 0xc0, 0xcd) },
  { "LightBlue4", RGB(0x68, 0x83, 0x8b) },
  { "LightCoral", RGB(0xf0, 0x80, 0x80) },
  { "LightCyan", RGB(0xe0, 0xff, 0xff) },
  { "LightCyan1", RGB(0xe0, 0xff, 0xff) },
  { "LightCyan2", RGB(0xd1, 0xee, 0xee) },
  { "LightCyan3", RGB(0xb4, 0xcd, 0xcd) },
  { "LightCyan4", RGB(0x7a, 0x8b, 0x8b) },
  { "LightGoldenrod", RGB(0xee, 0xdd, 0x82) },
  { "LightGoldenrod1", RGB(0xff, 0xec, 0x8b) },
  { "LightGoldenrod2", RGB(0xee, 0xdc, 0x82) },
  { "LightGoldenrod3", RGB(0xcd, 0xbe, 0x70) },
  { "LightGoldenrod4", RGB(0x8b, 0x81, 0x4c) },
  { "LightGoldenRodYellow", RGB(0xfa, 0xfa, 0xd2) },
  { "LightGray", RGB(0xd3, 0xd3, 0xd3) },
  { "LightGreen", RGB(0x90, 0xee, 0x90) },
  { "LightGrey", RGB(0xd3, 0xd3, 0xd3) },
  { "LightMagenta", RGB(0xff, 0xbb, 0xff) },
  { "LightPink", RGB(0xff, 0xb6, 0xc1) },
  { "LightPink1", RGB(0xff, 0xae, 0xb9) },
  { "LightPink2", RGB(0xee, 0xa2, 0xad) },
  { "LightPink3", RGB(0xcd, 0x8c, 0x95) },
  { "LightPink4", RGB(0x8b, 0x5f, 0x65) },
  { "LightRed", RGB(0xff, 0xbb, 0xbb) },
  { "LightSalmon", RGB(0xff, 0xa0, 0x7a) },
  { "LightSalmon1", RGB(0xff, 0xa0, 0x7a) },
  { "LightSalmon2", RGB(0xee, 0x95, 0x72) },
  { "LightSalmon3", RGB(0xcd, 0x81, 0x62) },
  { "LightSalmon4", RGB(0x8b, 0x57, 0x42) },
  { "LightSeaGreen", RGB(0x20, 0xb2, 0xaa) },
  { "LightSkyBlue", RGB(0x87, 0xce, 0xfa) },
  { "LightSkyBlue1", RGB(0xb0, 0xe2, 0xff) },
  { "LightSkyBlue2", RGB(0xa4, 0xd3, 0xee) },
  { "LightSkyBlue3", RGB(0x8d, 0xb6, 0xcd) },
  { "LightSkyBlue4", RGB(0x60, 0x7b, 0x8b) },
  { "LightSlateBlue", RGB(0x84, 0x70, 0xff) },
  { "LightSlateGray", RGB(0x77, 0x88, 0x99) },
  { "LightSlateGrey", RGB(0x77, 0x88, 0x99) },
  { "LightSteelBlue", RGB(0xb0, 0xc4, 0xde) },
  { "LightSteelBlue1", RGB(0xca, 0xe1, 0xff) },
  { "LightSteelBlue2", RGB(0xbc, 0xd2, 0xee) },
  { "LightSteelBlue3", RGB(0xa2, 0xb5, 0xcd) },
  { "LightSteelBlue4", RGB(0x6e, 0x7b, 0x8b) },
  { "LightYellow", RGB(0xff, 0xff, 0xe0) },
  { "LightYellow1", RGB(0xff, 0xff, 0xe0) },
  { "LightYellow2", RGB(0xee, 0xee, 0xd1) },
  { "LightYellow3", RGB(0xcd, 0xcd, 0xb4) },
  { "LightYellow4", RGB(0x8b, 0x8b, 0x7a) },
  { "Lime", RGB(0x00, 0xff, 0x00) },
  { "LimeGreen", RGB(0x32, 0xcd, 0x32) },
  { "Linen", RGB(0xfa, 0xf0, 0xe6) },
  { "Magenta", RGB(0xff, 0x00, 0xff) },
  { "Magenta1", RGB(0xff, 0x0, 0xff) },
  { "Magenta2", RGB(0xee, 0x0, 0xee) },
  { "Magenta3", RGB(0xcd, 0x0, 0xcd) },
  { "Magenta4", RGB(0x8b, 0x0, 0x8b) },
  { "Maroon", RGB(0x80, 0x00, 0x00) },
  { "Maroon1", RGB(0xff, 0x34, 0xb3) },
  { "Maroon2", RGB(0xee, 0x30, 0xa7) },
  { "Maroon3", RGB(0xcd, 0x29, 0x90) },
  { "Maroon4", RGB(0x8b, 0x1c, 0x62) },
  { "MediumAquamarine", RGB(0x66, 0xcd, 0xaa) },
  { "MediumBlue", RGB(0x00, 0x00, 0xcd) },
  { "MediumOrchid", RGB(0xba, 0x55, 0xd3) },
  { "MediumOrchid1", RGB(0xe0, 0x66, 0xff) },
  { "MediumOrchid2", RGB(0xd1, 0x5f, 0xee) },
  { "MediumOrchid3", RGB(0xb4, 0x52, 0xcd) },
  { "MediumOrchid4", RGB(0x7a, 0x37, 0x8b) },
  { "MediumPurple", RGB(0x93, 0x70, 0xdb) },
  { "MediumPurple1", RGB(0xab, 0x82, 0xff) },
  { "MediumPurple2", RGB(0x9f, 0x79, 0xee) },
  { "MediumPurple3", RGB(0x89, 0x68, 0xcd) },
  { "MediumPurple4", RGB(0x5d, 0x47, 0x8b) },
  { "MediumSeaGreen", RGB(0x3c, 0xb3, 0x71) },
  { "MediumSlateBlue", RGB(0x7b, 0x68, 0xee) },
  { "MediumSpringGreen", RGB(0x00, 0xfa, 0x9a) },
  { "MediumTurquoise", RGB(0x48, 0xd1, 0xcc) },
  { "MediumVioletRed", RGB(0xc7, 0x15, 0x85) },
  { "MidnightBlue", RGB(0x19, 0x19, 0x70) },
  { "MintCream", RGB(0xf5, 0xff, 0xfa) },
  { "MistyRose", RGB(0xff, 0xe4, 0xe1) },
  { "MistyRose1", RGB(0xff, 0xe4, 0xe1) },
  { "MistyRose2", RGB(0xee, 0xd5, 0xd2) },
  { "MistyRose3", RGB(0xcd, 0xb7, 0xb5) },
  { "MistyRose4", RGB(0x8b, 0x7d, 0x7b) },
  { "Moccasin", RGB(0xff, 0xe4, 0xb5) },
  { "NavajoWhite", RGB(0xff, 0xde, 0xad) },
  { "NavajoWhite1", RGB(0xff, 0xde, 0xad) },
  { "NavajoWhite2", RGB(0xee, 0xcf, 0xa1) },
  { "NavajoWhite3", RGB(0xcd, 0xb3, 0x8b) },
  { "NavajoWhite4", RGB(0x8b, 0x79, 0x5e) },
  { "Navy", RGB(0x00, 0x00, 0x80) },
  { "NavyBlue", RGB(0x0, 0x0, 0x80) },
  { "OldLace", RGB(0xfd, 0xf5, 0xe6) },
  { "Olive", RGB(0x80, 0x80, 0x00) },
  { "OliveDrab", RGB(0x6b, 0x8e, 0x23) },
  { "OliveDrab1", RGB(0xc0, 0xff, 0x3e) },
  { "OliveDrab2", RGB(0xb3, 0xee, 0x3a) },
  { "OliveDrab3", RGB(0x9a, 0xcd, 0x32) },
  { "OliveDrab4", RGB(0x69, 0x8b, 0x22) },
  { "Orange", RGB(0xff, 0xa5, 0x00) },
  { "Orange1", RGB(0xff, 0xa5, 0x0) },
  { "Orange2", RGB(0xee, 0x9a, 0x0) },
  { "Orange3", RGB(0xcd, 0x85, 0x0) },
  { "Orange4", RGB(0x8b, 0x5a, 0x0) },
  { "OrangeRed", RGB(0xff, 0x45, 0x00) },
  { "OrangeRed1", RGB(0xff, 0x45, 0x0) },
  { "OrangeRed2", RGB(0xee, 0x40, 0x0) },
  { "OrangeRed3", RGB(0xcd, 0x37, 0x0) },
  { "OrangeRed4", RGB(0x8b, 0x25, 0x0) },
  { "Orchid", RGB(0xda, 0x70, 0xd6) },
  { "Orchid1", RGB(0xff, 0x83, 0xfa) },
  { "Orchid2", RGB(0xee, 0x7a, 0xe9) },
  { "Orchid3", RGB(0xcd, 0x69, 0xc9) },
  { "Orchid4", RGB(0x8b, 0x47, 0x89) },
  { "PaleGoldenRod", RGB(0xee, 0xe8, 0xaa) },
  { "PaleGreen", RGB(0x98, 0xfb, 0x98) },
  { "PaleGreen1", RGB(0x9a, 0xff, 0x9a) },
  { "PaleGreen2", RGB(0x90, 0xee, 0x90) },
  { "PaleGreen3", RGB(0x7c, 0xcd, 0x7c) },
  { "PaleGreen4", RGB(0x54, 0x8b, 0x54) },
  { "PaleTurquoise", RGB(0xaf, 0xee, 0xee) },
  { "PaleTurquoise1", RGB(0xbb, 0xff, 0xff) },
  { "PaleTurquoise2", RGB(0xae, 0xee, 0xee) },
  { "PaleTurquoise3", RGB(0x96, 0xcd, 0xcd) },
  { "PaleTurquoise4", RGB(0x66, 0x8b, 0x8b) },
  { "PaleVioletRed", RGB(0xdb, 0x70, 0x93) },
  { "PaleVioletRed1", RGB(0xff, 0x82, 0xab) },
  { "PaleVioletRed2", RGB(0xee, 0x79, 0x9f) },
  { "PaleVioletRed3", RGB(0xcd, 0x68, 0x89) },
  { "PaleVioletRed4", RGB(0x8b, 0x47, 0x5d) },
  { "PapayaWhip", RGB(0xff, 0xef, 0xd5) },
  { "PeachPuff", RGB(0xff, 0xda, 0xb9) },
  { "PeachPuff1", RGB(0xff, 0xda, 0xb9) },
  { "PeachPuff2", RGB(0xee, 0xcb, 0xad) },
  { "PeachPuff3", RGB(0xcd, 0xaf, 0x95) },
  { "PeachPuff4", RGB(0x8b, 0x77, 0x65) },
  { "Peru", RGB(0xcd, 0x85, 0x3f) },
  { "Pink", RGB(0xff, 0xc0, 0xcb) },
  { "Pink1", RGB(0xff, 0xb5, 0xc5) },
  { "Pink2", RGB(0xee, 0xa9, 0xb8) },
  { "Pink3", RGB(0xcd, 0x91, 0x9e) },
  { "Pink4", RGB(0x8b, 0x63, 0x6c) },
  { "Plum", RGB(0xdd, 0xa0, 0xdd) },
  { "Plum1", RGB(0xff, 0xbb, 0xff) },
  { "Plum2", RGB(0xee, 0xae, 0xee) },
  { "Plum3", RGB(0xcd, 0x96, 0xcd) },
  { "Plum4", RGB(0x8b, 0x66, 0x8b) },
  { "PowderBlue", RGB(0xb0, 0xe0, 0xe6) },
  { "Purple", RGB(0x80, 0x00, 0x80) },
  { "Purple1", RGB(0x9b, 0x30, 0xff) },
  { "Purple2", RGB(0x91, 0x2c, 0xee) },
  { "Purple3", RGB(0x7d, 0x26, 0xcd) },
  { "Purple4", RGB(0x55, 0x1a, 0x8b) },
  { "RebeccaPurple", RGB(0x66, 0x33, 0x99) },
  { "Red", RGB(0xff, 0x00, 0x00) },
  { "Red1", RGB(0xff, 0x0, 0x0) },
  { "Red2", RGB(0xee, 0x0, 0x0) },
  { "Red3", RGB(0xcd, 0x0, 0x0) },
  { "Red4", RGB(0x8b, 0x0, 0x0) },
  { "RosyBrown", RGB(0xbc, 0x8f, 0x8f) },
  { "RosyBrown1", RGB(0xff, 0xc1, 0xc1) },
  { "RosyBrown2", RGB(0xee, 0xb4, 0xb4) },
  { "RosyBrown3", RGB(0xcd, 0x9b, 0x9b) },
  { "RosyBrown4", RGB(0x8b, 0x69, 0x69) },
  { "RoyalBlue", RGB(0x41, 0x69, 0xe1) },
  { "RoyalBlue1", RGB(0x48, 0x76, 0xff) },
  { "RoyalBlue2", RGB(0x43, 0x6e, 0xee) },
  { "RoyalBlue3", RGB(0x3a, 0x5f, 0xcd) },
  { "RoyalBlue4", RGB(0x27, 0x40, 0x8b) },
  { "SaddleBrown", RGB(0x8b, 0x45, 0x13) },
  { "Salmon", RGB(0xfa, 0x80, 0x72) },
  { "Salmon1", RGB(0xff, 0x8c, 0x69) },
  { "Salmon2", RGB(0xee, 0x82, 0x62) },
  { "Salmon3", RGB(0xcd, 0x70, 0x54) },
  { "Salmon4", RGB(0x8b, 0x4c, 0x39) },
  { "SandyBrown", RGB(0xf4, 0xa4, 0x60) },
  { "SeaGreen", RGB(0x2e, 0x8b, 0x57) },
  { "SeaGreen1", RGB(0x54, 0xff, 0x9f) },
  { "SeaGreen2", RGB(0x4e, 0xee, 0x94) },
  { "SeaGreen3", RGB(0x43, 0xcd, 0x80) },
  { "SeaGreen4", RGB(0x2e, 0x8b, 0x57) },
  { "SeaShell", RGB(0xff, 0xf5, 0xee) },
  { "Seashell1", RGB(0xff, 0xf5, 0xee) },
  { "Seashell2", RGB(0xee, 0xe5, 0xde) },
  { "Seashell3", RGB(0xcd, 0xc5, 0xbf) },
  { "Seashell4", RGB(0x8b, 0x86, 0x82) },
  { "Sienna", RGB(0xa0, 0x52, 0x2d) },
  { "Sienna1", RGB(0xff, 0x82, 0x47) },
  { "Sienna2", RGB(0xee, 0x79, 0x42) },
  { "Sienna3", RGB(0xcd, 0x68, 0x39) },
  { "Sienna4", RGB(0x8b, 0x47, 0x26) },
  { "Silver", RGB(0xc0, 0xc0, 0xc0) },
  { "SkyBlue", RGB(0x87, 0xce, 0xeb) },
  { "SkyBlue1", RGB(0x87, 0xce, 0xff) },
  { "SkyBlue2", RGB(0x7e, 0xc0, 0xee) },
  { "SkyBlue3", RGB(0x6c, 0xa6, 0xcd) },
  { "SkyBlue4", RGB(0x4a, 0x70, 0x8b) },
  { "SlateBlue", RGB(0x6a, 0x5a, 0xcd) },
  { "SlateBlue1", RGB(0x83, 0x6f, 0xff) },
  { "SlateBlue2", RGB(0x7a, 0x67, 0xee) },
  { "SlateBlue3", RGB(0x69, 0x59, 0xcd) },
  { "SlateBlue4", RGB(0x47, 0x3c, 0x8b) },
  { "SlateGray", RGB(0x70, 0x80, 0x90) },
  { "SlateGray1", RGB(0xc6, 0xe2, 0xff) },
  { "SlateGray2", RGB(0xb9, 0xd3, 0xee) },
  { "SlateGray3", RGB(0x9f, 0xb6, 0xcd) },
  { "SlateGray4", RGB(0x6c, 0x7b, 0x8b) },
  { "SlateGrey", RGB(0x70, 0x80, 0x90) },
  { "Snow", RGB(0xff, 0xfa, 0xfa) },
  { "Snow1", RGB(0xff, 0xfa, 0xfa) },
  { "Snow2", RGB(0xee, 0xe9, 0xe9) },
  { "Snow3", RGB(0xcd, 0xc9, 0xc9) },
  { "Snow4", RGB(0x8b, 0x89, 0x89) },
  { "SpringGreen", RGB(0x00, 0xff, 0x7f) },
  { "SpringGreen1", RGB(0x0, 0xff, 0x7f) },
  { "SpringGreen2", RGB(0x0, 0xee, 0x76) },
  { "SpringGreen3", RGB(0x0, 0xcd, 0x66) },
  { "SpringGreen4", RGB(0x0, 0x8b, 0x45) },
  { "SteelBlue", RGB(0x46, 0x82, 0xb4) },
  { "SteelBlue1", RGB(0x63, 0xb8, 0xff) },
  { "SteelBlue2", RGB(0x5c, 0xac, 0xee) },
  { "SteelBlue3", RGB(0x4f, 0x94, 0xcd) },
  { "SteelBlue4", RGB(0x36, 0x64, 0x8b) },
  { "Tan", RGB(0xd2, 0xb4, 0x8c) },
  { "Tan1", RGB(0xff, 0xa5, 0x4f) },
  { "Tan2", RGB(0xee, 0x9a, 0x49) },
  { "Tan3", RGB(0xcd, 0x85, 0x3f) },
  { "Tan4", RGB(0x8b, 0x5a, 0x2b) },
  { "Teal", RGB(0x00, 0x80, 0x80) },
  { "Thistle", RGB(0xd8, 0xbf, 0xd8) },
  { "Thistle1", RGB(0xff, 0xe1, 0xff) },
  { "Thistle2", RGB(0xee, 0xd2, 0xee) },
  { "Thistle3", RGB(0xcd, 0xb5, 0xcd) },
  { "Thistle4", RGB(0x8b, 0x7b, 0x8b) },
  { "Tomato", RGB(0xff, 0x63, 0x47) },
  { "Tomato1", RGB(0xff, 0x63, 0x47) },
  { "Tomato2", RGB(0xee, 0x5c, 0x42) },
  { "Tomato3", RGB(0xcd, 0x4f, 0x39) },
  { "Tomato4", RGB(0x8b, 0x36, 0x26) },
  { "Turquoise", RGB(0x40, 0xe0, 0xd0) },
  { "Turquoise1", RGB(0x0, 0xf5, 0xff) },
  { "Turquoise2", RGB(0x0, 0xe5, 0xee) },
  { "Turquoise3", RGB(0x0, 0xc5, 0xcd) },
  { "Turquoise4", RGB(0x0, 0x86, 0x8b) },
  { "Violet", RGB(0xee, 0x82, 0xee) },
  { "VioletRed", RGB(0xd0, 0x20, 0x90) },
  { "VioletRed1", RGB(0xff, 0x3e, 0x96) },
  { "VioletRed2", RGB(0xee, 0x3a, 0x8c) },
  { "VioletRed3", RGB(0xcd, 0x32, 0x78) },
  { "VioletRed4", RGB(0x8b, 0x22, 0x52) },
  { "WebGray", RGB(0x80, 0x80, 0x80) },
  { "WebGreen", RGB(0x0, 0x80, 0x0) },
  { "WebGrey", RGB(0x80, 0x80, 0x80) },
  { "WebMaroon", RGB(0x80, 0x0, 0x0) },
  { "WebPurple", RGB(0x80, 0x0, 0x80) },
  { "Wheat", RGB(0xf5, 0xde, 0xb3) },
  { "Wheat1", RGB(0xff, 0xe7, 0xba) },
  { "Wheat2", RGB(0xee, 0xd8, 0xae) },
  { "Wheat3", RGB(0xcd, 0xba, 0x96) },
  { "Wheat4", RGB(0x8b, 0x7e, 0x66) },
  { "White", RGB(0xff, 0xff, 0xff) },
  { "WhiteSmoke", RGB(0xf5, 0xf5, 0xf5) },
  { "X11Gray", RGB(0xbe, 0xbe, 0xbe) },
  { "X11Green", RGB(0x0, 0xff, 0x0) },
  { "X11Grey", RGB(0xbe, 0xbe, 0xbe) },
  { "X11Maroon", RGB(0xb0, 0x30, 0x60) },
  { "X11Purple", RGB(0xa0, 0x20, 0xf0) },
  { "Yellow", RGB(0xff, 0xff, 0x00) },
  { "Yellow1", RGB(0xff, 0xff, 0x0) },
  { "Yellow2", RGB(0xee, 0xee, 0x0) },
  { "Yellow3", RGB(0xcd, 0xcd, 0x0) },
  { "Yellow4", RGB(0x8b, 0x8b, 0x0) },
  { "YellowGreen", RGB(0x9a, 0xcd, 0x32) },
  { NULL, 0 },
};


/// Translate to RgbValue if \p name is an hex value (e.g. #XXXXXX),
/// else look into color_name_table to translate a color name to  its
/// hex value
///
/// @param[in] name string value to convert to RGB
/// return the hex value or -1 if could not find a correct value
RgbValue name_to_color(const uint8_t *name)
{

  if (name[0] == '#' && isxdigit(name[1]) && isxdigit(name[2])
      && isxdigit(name[3]) && isxdigit(name[4]) && isxdigit(name[5])
      && isxdigit(name[6]) && name[7] == NUL) {
    // rgb hex string
    return strtol((char *)(name + 1), NULL, 16);
  } else if (!STRICMP(name, "bg") || !STRICMP(name, "background")) {
    return normal_bg;
  } else if (!STRICMP(name, "fg") || !STRICMP(name, "foreground")) {
    return normal_fg;
  }

  for (int i = 0; color_name_table[i].name != NULL; i++) {
    if (!STRICMP(name, color_name_table[i].name)) {
      return color_name_table[i].color;
    }
  }

  return -1;
}

/**************************************
*  End of Highlighting stuff	      *
**************************************/
