/**********************************************************************

  parse.y -

  $Author: yugui $
  created at: Fri May 28 18:02:42 JST 1993

  Copyright (C) 1993-2007 Yukihiro Matsumoto

**********************************************************************/

%{

#define YYDEBUG 1
#define YYERROR_VERBOSE 1
#define YYSTACK_USE_ALLOCA 0

#include "ruby/ruby.h"
#include "ruby/st.h"
#include "ruby/encoding.h"
#include "node.h"
#include "parse.h"
#include "id.h"
#include "regenc.h"
#include <stdio.h>
#include <errno.h>
#include <ctype.h>

#define YYMALLOC(size)		rb_parser_malloc(parser, size)
#define YYREALLOC(ptr, size)	rb_parser_realloc(parser, ptr, size)
#define YYCALLOC(nelem, size)	rb_parser_calloc(parser, nelem, size)
#define YYFREE(ptr)		rb_parser_free(parser, ptr)
#define malloc	YYMALLOC
#define realloc	YYREALLOC
#define calloc	YYCALLOC
#define free	YYFREE

#ifndef RIPPER
static ID register_symid(ID, const char *, long, rb_encoding *);
#define REGISTER_SYMID(id, name) register_symid(id, name, strlen(name), enc)
#include "id.c"
#endif

#define is_notop_id(id) ((id)>tLAST_TOKEN)
#define is_local_id(id) (is_notop_id(id)&&((id)&ID_SCOPE_MASK)==ID_LOCAL)
#define is_global_id(id) (is_notop_id(id)&&((id)&ID_SCOPE_MASK)==ID_GLOBAL)
#define is_instance_id(id) (is_notop_id(id)&&((id)&ID_SCOPE_MASK)==ID_INSTANCE)
#define is_attrset_id(id) (is_notop_id(id)&&((id)&ID_SCOPE_MASK)==ID_ATTRSET)
#define is_const_id(id) (is_notop_id(id)&&((id)&ID_SCOPE_MASK)==ID_CONST)
#define is_class_id(id) (is_notop_id(id)&&((id)&ID_SCOPE_MASK)==ID_CLASS)
#define is_junk_id(id) (is_notop_id(id)&&((id)&ID_SCOPE_MASK)==ID_JUNK)

#define is_asgn_or_id(id) ((is_notop_id(id)) && \
	(((id)&ID_SCOPE_MASK) == ID_GLOBAL || \
	 ((id)&ID_SCOPE_MASK) == ID_INSTANCE || \
	 ((id)&ID_SCOPE_MASK) == ID_CLASS))

enum lex_state_e {
    EXPR_BEG,			/* ignore newline, +/- is a sign. */
    EXPR_END,			/* newline significant, +/- is an operator. */
    EXPR_ENDARG,		/* ditto, and unbound braces. */
    EXPR_ARG,			/* newline significant, +/- is an operator. */
    EXPR_CMDARG,		/* newline significant, +/- is an operator. */
    EXPR_MID,			/* newline significant, +/- is an operator. */
    EXPR_FNAME,			/* ignore newline, no reserved words. */
    EXPR_DOT,			/* right after `.' or `::', no reserved words. */
    EXPR_CLASS,			/* immediate after `class', no here document. */
    EXPR_VALUE			/* alike EXPR_BEG but label is disallowed. */
};

# ifdef HAVE_LONG_LONG
typedef unsigned LONG_LONG stack_type;
# else
typedef unsigned long stack_type;
# endif

# define BITSTACK_PUSH(stack, n)	(stack = (stack<<1)|((n)&1))
# define BITSTACK_POP(stack)	(stack = stack >> 1)
# define BITSTACK_LEXPOP(stack)	(stack = (stack >> 1) | (stack & 1))
# define BITSTACK_SET_P(stack)	(stack&1)

#define COND_PUSH(n)	BITSTACK_PUSH(cond_stack, n)
#define COND_POP()	BITSTACK_POP(cond_stack)
#define COND_LEXPOP()	BITSTACK_LEXPOP(cond_stack)
#define COND_P()	BITSTACK_SET_P(cond_stack)

#define CMDARG_PUSH(n)	BITSTACK_PUSH(cmdarg_stack, n)
#define CMDARG_POP()	BITSTACK_POP(cmdarg_stack)
#define CMDARG_LEXPOP()	BITSTACK_LEXPOP(cmdarg_stack)
#define CMDARG_P()	BITSTACK_SET_P(cmdarg_stack)

struct vtable {
    ID *tbl;
    int pos;
    int capa;
    struct vtable *prev;
};

struct local_vars {
    struct vtable *args;
    struct vtable *vars;
    struct local_vars *prev;
};

#define DVARS_INHERIT ((void*)1)
#define DVARS_TOPSCOPE NULL
#define DVARS_SPECIAL_P(tbl) (!POINTER_P(tbl))
#define POINTER_P(val) ((VALUE)(val) & ~(VALUE)3)

static int
vtable_size(const struct vtable *tbl)
{
    if (POINTER_P(tbl)) {
        return tbl->pos;
    }
    else {
        return 0;
    }
}

#define VTBL_DEBUG 0

static struct vtable *
vtable_alloc(struct vtable *prev)
{
    struct vtable *tbl = ALLOC(struct vtable);
    tbl->pos = 0;
    tbl->capa = 8;
    tbl->tbl = ALLOC_N(ID, tbl->capa);
    tbl->prev = prev;
    if (VTBL_DEBUG) printf("vtable_alloc: %p\n", (void *)tbl);
    return tbl;
}

static void
vtable_free(struct vtable *tbl)
{
    if (VTBL_DEBUG)printf("vtable_free: %p\n", (void *)tbl);
    if (POINTER_P(tbl)) {
        if (tbl->tbl) {
            xfree(tbl->tbl);
        }
        xfree(tbl);
    }
}

static void
vtable_add(struct vtable *tbl, ID id)
{
    if (!POINTER_P(tbl)) {
        rb_bug("vtable_add: vtable is not allocated (%p)", (void *)tbl);
    }
    if (VTBL_DEBUG) printf("vtable_add: %p, %s\n", (void *)tbl, rb_id2name(id));

    if (tbl->pos == tbl->capa) {
        tbl->capa = tbl->capa * 2;
        REALLOC_N(tbl->tbl, ID, tbl->capa);
    }
    tbl->tbl[tbl->pos++] = id;
}

static int
vtable_included(const struct vtable * tbl, ID id)
{
    int i;

    if (POINTER_P(tbl)) {
        for (i = 0; i < tbl->pos; i++) {
            if (tbl->tbl[i] == id) {
                return 1;
            }
        }
    }
    return 0;
}


#ifndef RIPPER
typedef struct token_info {
    const char *token;
    int linenum;
    int column;
    int nonspc;
    struct token_info *next;
} token_info;
#endif

/*
    Structure of Lexer Buffer:

 lex_pbeg      tokp         lex_p        lex_pend
    |           |              |            |
    |-----------+--------------+------------|
                |<------------>|
                     token
*/
struct parser_params {
    int is_ripper;
    NODE *heap;

    YYSTYPE *parser_yylval;
    VALUE eofp;

    NODE *parser_lex_strterm;
    enum lex_state_e parser_lex_state;
    stack_type parser_cond_stack;
    stack_type parser_cmdarg_stack;
    int parser_class_nest;
    int parser_paren_nest;
    int parser_lpar_beg;
    int parser_in_single;
    int parser_in_def;
    int parser_compile_for_eval;
    VALUE parser_cur_mid;
    int parser_in_defined;
    char *parser_tokenbuf;
    int parser_tokidx;
    int parser_toksiz;
    VALUE parser_lex_input;
    VALUE parser_lex_lastline;
    VALUE parser_lex_nextline;
    const char *parser_lex_pbeg;
    const char *parser_lex_p;
    const char *parser_lex_pend;
    int parser_heredoc_end;
    int parser_command_start;
    NODE *parser_deferred_nodes;
    int parser_lex_gets_ptr;
    VALUE (*parser_lex_gets)(struct parser_params*,VALUE);
    struct local_vars *parser_lvtbl;
    int parser_ruby__end__seen;
    int line_count;
    int has_shebang;
    char *parser_ruby_sourcefile; /* current source file */
    int parser_ruby_sourceline;	/* current line no. */
    rb_encoding *enc;
    rb_encoding *utf8;

    int parser_yydebug;

#ifndef RIPPER
    /* Ruby core only */
    NODE *parser_eval_tree_begin;
    NODE *parser_eval_tree;
    VALUE debug_lines;
    VALUE coverage;
    int nerr;

    token_info *parser_token_info;
#else
    /* Ripper only */
    VALUE parser_ruby_sourcefile_string;
    const char *tokp;
    VALUE delayed;
    int delayed_line;
    int delayed_col;

    VALUE value;
    VALUE result;
    VALUE parsing_thread;
    int toplevel_p;
#endif
};

#define UTF8_ENC() (parser->utf8 ? parser->utf8 : \
		    (parser->utf8 = rb_utf8_encoding()))
#define STR_NEW(p,n) rb_enc_str_new((p),(n),parser->enc)
#define STR_NEW0() rb_enc_str_new(0,0,parser->enc)
#define STR_NEW2(p) rb_enc_str_new((p),strlen(p),parser->enc)
#define STR_NEW3(p,n,e,func) parser_str_new((p),(n),(e),(func),parser->enc)
#define ENC_SINGLE(cr) ((cr)==ENC_CODERANGE_7BIT)
#define TOK_INTERN(mb) rb_intern3(tok(), toklen(), parser->enc)

#ifdef YYMALLOC
void *rb_parser_malloc(struct parser_params *, size_t);
void *rb_parser_realloc(struct parser_params *, void *, size_t);
void *rb_parser_calloc(struct parser_params *, size_t, size_t);
void rb_parser_free(struct parser_params *, void *);
#endif

static int parser_yyerror(struct parser_params*, const char*);
#define yyerror(msg) parser_yyerror(parser, msg)

#define YYLEX_PARAM parser

#define lex_strterm		(parser->parser_lex_strterm)
#define lex_state		(parser->parser_lex_state)
#define cond_stack		(parser->parser_cond_stack)
#define cmdarg_stack		(parser->parser_cmdarg_stack)
#define class_nest		(parser->parser_class_nest)
#define paren_nest		(parser->parser_paren_nest)
#define lpar_beg		(parser->parser_lpar_beg)
#define in_single		(parser->parser_in_single)
#define in_def			(parser->parser_in_def)
#define compile_for_eval	(parser->parser_compile_for_eval)
#define cur_mid			(parser->parser_cur_mid)
#define in_defined		(parser->parser_in_defined)
#define tokenbuf		(parser->parser_tokenbuf)
#define tokidx			(parser->parser_tokidx)
#define toksiz			(parser->parser_toksiz)
#define lex_input		(parser->parser_lex_input)
#define lex_lastline		(parser->parser_lex_lastline)
#define lex_nextline		(parser->parser_lex_nextline)
#define lex_pbeg		(parser->parser_lex_pbeg)
#define lex_p			(parser->parser_lex_p)
#define lex_pend		(parser->parser_lex_pend)
#define heredoc_end		(parser->parser_heredoc_end)
#define command_start		(parser->parser_command_start)
#define deferred_nodes		(parser->parser_deferred_nodes)
#define lex_gets_ptr		(parser->parser_lex_gets_ptr)
#define lex_gets		(parser->parser_lex_gets)
#define lvtbl			(parser->parser_lvtbl)
#define ruby__end__seen		(parser->parser_ruby__end__seen)
#define ruby_sourceline		(parser->parser_ruby_sourceline)
#define ruby_sourcefile		(parser->parser_ruby_sourcefile)
#define yydebug			(parser->parser_yydebug)
#ifdef RIPPER
#else
#define ruby_eval_tree		(parser->parser_eval_tree)
#define ruby_eval_tree_begin	(parser->parser_eval_tree_begin)
#define ruby_debug_lines	(parser->debug_lines)
#define ruby_coverage		(parser->coverage)
#endif

static int yylex(void*, void*);

#ifndef RIPPER
#define yyparse ruby_yyparse

static NODE* node_newnode(struct parser_params *, enum node_type, VALUE, VALUE, VALUE);
#define rb_node_newnode(type, a1, a2, a3) node_newnode(parser, type, a1, a2, a3)

static NODE *cond_gen(struct parser_params*,NODE*);
#define cond(node) cond_gen(parser, node)
static NODE *logop_gen(struct parser_params*,enum node_type,NODE*,NODE*);
#define logop(type,node1,node2) logop_gen(parser, type, node1, node2)

static NODE *newline_node(NODE*);
static void fixpos(NODE*,NODE*);

static int value_expr_gen(struct parser_params*,NODE*);
static void void_expr_gen(struct parser_params*,NODE*);
static NODE *remove_begin(NODE*);
#define value_expr(node) value_expr_gen(parser, (node) = remove_begin(node))
#define void_expr0(node) void_expr_gen(parser, (node))
#define void_expr(node) void_expr0((node) = remove_begin(node))
static void void_stmts_gen(struct parser_params*,NODE*);
#define void_stmts(node) void_stmts_gen(parser, node)
static void reduce_nodes_gen(struct parser_params*,NODE**);
#define reduce_nodes(n) reduce_nodes_gen(parser,n)
static void block_dup_check_gen(struct parser_params*,NODE*,NODE*);
#define block_dup_check(n1,n2) block_dup_check_gen(parser,n1,n2)

static NODE *block_append_gen(struct parser_params*,NODE*,NODE*);
#define block_append(h,t) block_append_gen(parser,h,t)
static NODE *list_append_gen(struct parser_params*,NODE*,NODE*);
#define list_append(l,i) list_append_gen(parser,l,i)
static NODE *list_concat_gen(struct parser_params*,NODE*,NODE*);
#define list_concat(h,t) list_concat_gen(parser,h,t)
static NODE *arg_append_gen(struct parser_params*,NODE*,NODE*);
#define arg_append(h,t) arg_append_gen(parser,h,t)
static NODE *arg_concat_gen(struct parser_params*,NODE*,NODE*);
#define arg_concat(h,t) arg_concat_gen(parser,h,t)
static NODE *literal_concat_gen(struct parser_params*,NODE*,NODE*);
#define literal_concat(h,t) literal_concat_gen(parser,h,t)
static NODE *new_evstr_gen(struct parser_params*,NODE*);
#define new_evstr(n) new_evstr_gen(parser,n)
static NODE *evstr2dstr_gen(struct parser_params*,NODE*);
#define evstr2dstr(n) evstr2dstr_gen(parser,n)
static NODE *splat_array(NODE*);

static NODE *call_bin_op_gen(struct parser_params*,NODE*,ID,NODE*);
#define call_bin_op(recv,id,arg1) call_bin_op_gen(parser, recv,id,arg1)
static NODE *call_uni_op_gen(struct parser_params*,NODE*,ID);
#define call_uni_op(recv,id) call_uni_op_gen(parser, recv,id)

static NODE *new_args_gen(struct parser_params*,NODE*,NODE*,ID,NODE*,ID);
#define new_args(f,o,r,p,b) new_args_gen(parser, f,o,r,p,b)

static NODE *negate_lit(NODE*);
static NODE *ret_args_gen(struct parser_params*,NODE*);
#define ret_args(node) ret_args_gen(parser, node)
static NODE *arg_blk_pass(NODE*,NODE*);
static NODE *new_yield_gen(struct parser_params*,NODE*);
#define new_yield(node) new_yield_gen(parser, node)

static NODE *gettable_gen(struct parser_params*,ID);
#define gettable(id) gettable_gen(parser,id)
static NODE *assignable_gen(struct parser_params*,ID,NODE*);
#define assignable(id,node) assignable_gen(parser, id, node)

static NODE *aryset_gen(struct parser_params*,NODE*,NODE*);
#define aryset(node1,node2) aryset_gen(parser, node1, node2)
static NODE *attrset_gen(struct parser_params*,NODE*,ID);
#define attrset(node,id) attrset_gen(parser, node, id)

static void rb_backref_error_gen(struct parser_params*,NODE*);
#define rb_backref_error(n) rb_backref_error_gen(parser,n)
static NODE *node_assign_gen(struct parser_params*,NODE*,NODE*);
#define node_assign(node1, node2) node_assign_gen(parser, node1, node2)

static NODE *match_op_gen(struct parser_params*,NODE*,NODE*);
#define match_op(node1,node2) match_op_gen(parser, node1, node2)

static ID  *local_tbl_gen(struct parser_params*);
#define local_tbl() local_tbl_gen(parser)

static void fixup_nodes(NODE **);

extern int rb_dvar_defined(ID);
extern int rb_local_defined(ID);
extern int rb_parse_in_eval(void);
extern int rb_parse_in_main(void);

static VALUE reg_compile_gen(struct parser_params*, VALUE, int);
#define reg_compile(str,options) reg_compile_gen(parser, str, options)
static void reg_fragment_setenc_gen(struct parser_params*, VALUE, int);
#define reg_fragment_setenc(str,options) reg_fragment_setenc_gen(parser, str, options)
static void reg_fragment_check_gen(struct parser_params*, VALUE, int);
#define reg_fragment_check(str,options) reg_fragment_check_gen(parser, str, options)
static NODE *reg_named_capture_assign_gen(struct parser_params* parser, VALUE regexp, NODE *match);
#define reg_named_capture_assign(regexp,match) reg_named_capture_assign_gen(parser,regexp,match)

#define get_id(id) (id)
#define get_value(val) (val)
#else
#define remove_begin(node) (node)
#define rb_dvar_defined(id) 0
#define rb_local_defined(id) 0
static ID ripper_get_id(VALUE);
#define get_id(id) ripper_get_id(id)
static VALUE ripper_get_value(VALUE);
#define get_value(val) ripper_get_value(val)
static VALUE assignable_gen(struct parser_params*,VALUE);
#define assignable(lhs,node) assignable_gen(parser, lhs)
#endif /* !RIPPER */

static ID formal_argument_gen(struct parser_params*, ID);
#define formal_argument(id) formal_argument_gen(parser, id)
static ID shadowing_lvar_gen(struct parser_params*,ID);
#define shadowing_lvar(name) shadowing_lvar_gen(parser, name)
static void new_bv_gen(struct parser_params*,ID);
#define new_bv(id) new_bv_gen(parser, id)

static void local_push_gen(struct parser_params*,int);
#define local_push(top) local_push_gen(parser,top)
static void local_pop_gen(struct parser_params*);
#define local_pop() local_pop_gen(parser)
static int local_var_gen(struct parser_params*, ID);
#define local_var(id) local_var_gen(parser, id);
static int arg_var_gen(struct parser_params*, ID);
#define arg_var(id) arg_var_gen(parser, id)
static int  local_id_gen(struct parser_params*, ID);
#define local_id(id) local_id_gen(parser, id)
static ID   internal_id_gen(struct parser_params*);
#define internal_id() internal_id_gen(parser)

static const struct vtable *dyna_push_gen(struct parser_params *);
#define dyna_push() dyna_push_gen(parser)
static void dyna_pop_gen(struct parser_params*, const struct vtable *);
#define dyna_pop(node) dyna_pop_gen(parser, node)
static int dyna_in_block_gen(struct parser_params*);
#define dyna_in_block() dyna_in_block_gen(parser)
#define dyna_var(id) local_var(id)
static int dvar_defined_gen(struct parser_params*,ID);
#define dvar_defined(id) dvar_defined_gen(parser, id)
static int dvar_curr_gen(struct parser_params*,ID);
#define dvar_curr(id) dvar_curr_gen(parser, id)

static int lvar_defined_gen(struct parser_params*, ID);
#define lvar_defined(id) lvar_defined_gen(parser, id)

#define RE_OPTION_ONCE (1<<16)
#define RE_OPTION_ENCODING_SHIFT 8
#define RE_OPTION_ENCODING(e) (((e)&0xff)<<RE_OPTION_ENCODING_SHIFT)
#define RE_OPTION_ENCODING_IDX(o) (((o)>>RE_OPTION_ENCODING_SHIFT)&0xff)
#define RE_OPTION_ENCODING_NONE(o) ((o)&RE_OPTION_ARG_ENCODING_NONE)
#define RE_OPTION_MASK  0xff
#define RE_OPTION_ARG_ENCODING_NONE 32

#define NODE_STRTERM NODE_ZARRAY	/* nothing to gc */
#define NODE_HEREDOC NODE_ARRAY 	/* 1, 3 to gc */
#define SIGN_EXTEND(x,n) (((1<<(n)-1)^((x)&~(~0<<(n))))-(1<<(n)-1))
#define nd_func u1.id
#if SIZEOF_SHORT == 2
#define nd_term(node) ((signed short)(node)->u2.id)
#else
#define nd_term(node) SIGN_EXTEND((node)->u2.id, CHAR_BIT*2)
#endif
#define nd_paren(node) (char)((node)->u2.id >> CHAR_BIT*2)
#define nd_nest u3.cnt

/****** Ripper *******/

#ifdef RIPPER
#define RIPPER_VERSION "0.1.0"

#include "eventids1.c"
#include "eventids2.c"
static ID ripper_id_gets;

static VALUE ripper_dispatch0(struct parser_params*,ID);
static VALUE ripper_dispatch1(struct parser_params*,ID,VALUE);
static VALUE ripper_dispatch2(struct parser_params*,ID,VALUE,VALUE);
static VALUE ripper_dispatch3(struct parser_params*,ID,VALUE,VALUE,VALUE);
static VALUE ripper_dispatch4(struct parser_params*,ID,VALUE,VALUE,VALUE,VALUE);
static VALUE ripper_dispatch5(struct parser_params*,ID,VALUE,VALUE,VALUE,VALUE,VALUE);

#define dispatch0(n)            ripper_dispatch0(parser, TOKEN_PASTE(ripper_id_, n))
#define dispatch1(n,a)          ripper_dispatch1(parser, TOKEN_PASTE(ripper_id_, n), a)
#define dispatch2(n,a,b)        ripper_dispatch2(parser, TOKEN_PASTE(ripper_id_, n), a, b)
#define dispatch3(n,a,b,c)      ripper_dispatch3(parser, TOKEN_PASTE(ripper_id_, n), a, b, c)
#define dispatch4(n,a,b,c,d)    ripper_dispatch4(parser, TOKEN_PASTE(ripper_id_, n), a, b, c, d)
#define dispatch5(n,a,b,c,d,e)  ripper_dispatch5(parser, TOKEN_PASTE(ripper_id_, n), a, b, c, d, e)

#define yyparse ripper_yyparse

static VALUE ripper_intern(const char*);
static VALUE ripper_id2sym(ID);
#ifdef __GNUC__
#define ripper_id2sym(id) ((id) < 256 && rb_ispunct(id) ? \
			   ID2SYM(id) : ripper_id2sym(id))
#endif

#define arg_new() dispatch0(args_new)
#define arg_add(l,a) dispatch2(args_add, l, a)
#define arg_prepend(l,a) dispatch2(args_prepend, l, a)
#define arg_add_star(l,a) dispatch2(args_add_star, l, a)
#define arg_add_block(l,b) dispatch2(args_add_block, l, b)
#define arg_add_optblock(l,b) ((b)==Qundef? l : dispatch2(args_add_block, l, b))
#define bare_assoc(v) dispatch1(bare_assoc_hash, v)
#define arg_add_assocs(l,b) arg_add(l, bare_assoc(b))

#define args2mrhs(a) dispatch1(mrhs_new_from_args, a)
#define mrhs_new() dispatch0(mrhs_new)
#define mrhs_add(l,a) dispatch2(mrhs_add, l, a)
#define mrhs_add_star(l,a) dispatch2(mrhs_add_star, l, a)

#define mlhs_new() dispatch0(mlhs_new)
#define mlhs_add(l,a) dispatch2(mlhs_add, l, a)
#define mlhs_add_star(l,a) dispatch2(mlhs_add_star, l, a)

#define params_new(pars, opts, rest, pars2, blk) \
        dispatch5(params, pars, opts, rest, pars2, blk)

#define blockvar_new(p,v) dispatch2(block_var, p, v)
#define blockvar_add_star(l,a) dispatch2(block_var_add_star, l, a)
#define blockvar_add_block(l,a) dispatch2(block_var_add_block, l, a)

#define method_optarg(m,a) ((a)==Qundef ? m : dispatch2(method_add_arg,m,a))
#define method_arg(m,a) dispatch2(method_add_arg,m,a)
#define method_add_block(m,b) dispatch2(method_add_block, m, b)

#define escape_Qundef(x) ((x)==Qundef ? Qnil : (x))

#define FIXME 0

#endif /* RIPPER */

#ifndef RIPPER
# define ifndef_ripper(x) x
#else
# define ifndef_ripper(x)
#endif

#ifndef RIPPER
# define rb_warn0(fmt)    rb_compile_warn(ruby_sourcefile, ruby_sourceline, fmt)
# define rb_warnI(fmt,a)  rb_compile_warn(ruby_sourcefile, ruby_sourceline, fmt, a)
# define rb_warnS(fmt,a)  rb_compile_warn(ruby_sourcefile, ruby_sourceline, fmt, a)
# define rb_warning0(fmt) rb_compile_warning(ruby_sourcefile, ruby_sourceline, fmt)
# define rb_warningS(fmt,a) rb_compile_warning(ruby_sourcefile, ruby_sourceline, fmt, a)
#else
# define rb_warn0(fmt)    ripper_warn0(parser, fmt)
# define rb_warnI(fmt,a)  ripper_warnI(parser, fmt, a)
# define rb_warnS(fmt,a)  ripper_warnS(parser, fmt, a)
# define rb_warning0(fmt) ripper_warning0(parser, fmt)
# define rb_warningS(fmt,a) ripper_warningS(parser, fmt, a)
static void ripper_warn0(struct parser_params*, const char*);
static void ripper_warnI(struct parser_params*, const char*, int);
#if 0
static void ripper_warnS(struct parser_params*, const char*, const char*);
#endif
static void ripper_warning0(struct parser_params*, const char*);
static void ripper_warningS(struct parser_params*, const char*, const char*);
#endif

#ifdef RIPPER
static void ripper_compile_error(struct parser_params*, const char *fmt, ...);
# define rb_compile_error ripper_compile_error
# define compile_error ripper_compile_error
# define PARSER_ARG parser,
#else
# define compile_error parser->nerr++,rb_compile_error
# define PARSER_ARG ruby_sourcefile, ruby_sourceline,
#endif

/* Older versions of Yacc set YYMAXDEPTH to a very low value by default (150,
   for instance).  This is too low for Ruby to parse some files, such as
   date/format.rb, therefore bump the value up to at least Bison's default. */
#ifdef OLD_YACC
#ifndef YYMAXDEPTH
#define YYMAXDEPTH 10000
#endif
#endif

#ifndef RIPPER
static void token_info_push(struct parser_params*, const char *token);
static void token_info_pop(struct parser_params*, const char *token);
#endif
%}

%pure_parser
%parse-param {struct parser_params *parser}

%union {
    VALUE val;
    NODE *node;
    ID id;
    int num;
    const struct vtable *vars;
}

/*%%%*/
%token
/*%
%token <val>
%*/
	keyword_class
	keyword_module
	keyword_def
	keyword_undef
	keyword_begin
	keyword_rescue
	keyword_ensure
	keyword_end
	keyword_if
	keyword_unless
	keyword_then
	keyword_elsif
	keyword_else
	keyword_case
	keyword_when
	keyword_while
	keyword_until
	keyword_for
	keyword_break
	keyword_next
	keyword_redo
	keyword_retry
	keyword_in
	keyword_do
	keyword_do_cond
	keyword_do_block
	keyword_do_LAMBDA
	keyword_return
	keyword_yield
	keyword_super
	keyword_self
	keyword_nil
	keyword_true
	keyword_false
	keyword_and
	keyword_or
	keyword_not
	modifier_if
	modifier_unless
	modifier_while
	modifier_until
	modifier_rescue
	keyword_alias
	keyword_defined
	keyword_BEGIN
	keyword_END
	keyword__LINE__
	keyword__FILE__
	keyword__ENCODING__

%token <id>   tIDENTIFIER tFID tGVAR tIVAR tCONSTANT tCVAR tLABEL
%token <node> tINTEGER tFLOAT tSTRING_CONTENT tCHAR
%token <node> tNTH_REF tBACK_REF
%token <num>  tREGEXP_END

%type <node> singleton strings string string1 xstring regexp
%type <node> string_contents xstring_contents string_content
%type <node> words qwords word_list qword_list word
%type <node> literal numeric dsym cpath
%type <node> top_compstmt top_stmts top_stmt
%type <node> bodystmt compstmt stmts stmt expr arg primary command command_call method_call
%type <node> expr_value arg_value primary_value
%type <node> if_tail opt_else case_body cases opt_rescue exc_list exc_var opt_ensure
%type <node> args call_args opt_call_args
%type <node> paren_args opt_paren_args
%type <node> command_args aref_args opt_block_arg block_arg var_ref var_lhs
%type <node> mrhs superclass block_call block_command
%type <node> f_block_optarg f_block_opt
%type <node> f_arglist f_args f_arg f_arg_item f_optarg f_marg f_marg_list f_margs
%type <node> assoc_list assocs assoc undef_list backref string_dvar for_var
%type <node> block_param opt_block_param block_param_def f_opt
%type <node> bv_decls opt_bv_decl bvar
%type <node> lambda f_larglist lambda_body
%type <node> brace_block cmd_brace_block do_block lhs none fitem
%type <node> mlhs mlhs_head mlhs_basic mlhs_item mlhs_node mlhs_post mlhs_inner
%type <id>   fsym variable sym symbol operation operation2 operation3
%type <id>   cname fname op f_rest_arg f_block_arg opt_f_block_arg f_norm_arg f_bad_arg
/*%%%*/
/*%
%type <val> program reswords then do dot_or_colon
%*/
%token tUPLUS		/* unary+ */
%token tUMINUS		/* unary- */
%token tPOW		/* ** */
%token tCMP		/* <=> */
%token tEQ		/* == */
%token tEQQ		/* === */
%token tNEQ		/* != */
%token tGEQ		/* >= */
%token tLEQ		/* <= */
%token tANDOP tOROP	/* && and || */
%token tMATCH tNMATCH	/* =~ and !~ */
%token tDOT2 tDOT3	/* .. and ... */
%token tAREF tASET	/* [] and []= */
%token tLSHFT tRSHFT	/* << and >> */
%token tCOLON2		/* :: */
%token tCOLON3		/* :: at EXPR_BEG */
%token <id> tOP_ASGN	/* +=, -=  etc. */
%token tASSOC		/* => */
%token tLPAREN		/* ( */
%token tLPAREN_ARG	/* ( */
%token tRPAREN		/* ) */
%token tLBRACK		/* [ */
%token tLBRACE		/* { */
%token tLBRACE_ARG	/* { */
%token tSTAR		/* * */
%token tAMPER		/* & */
%token tLAMBDA		/* -> */
%token tSYMBEG tSTRING_BEG tXSTRING_BEG tREGEXP_BEG tWORDS_BEG tQWORDS_BEG
%token tSTRING_DBEG tSTRING_DVAR tSTRING_END tLAMBEG

/*
 *	precedence table
 */

%nonassoc tLOWEST
%nonassoc tLBRACE_ARG

%nonassoc  modifier_if modifier_unless modifier_while modifier_until
%left  keyword_or keyword_and
%right keyword_not
%nonassoc keyword_defined
%right '=' tOP_ASGN
%left modifier_rescue
%right '?' ':'
%nonassoc tDOT2 tDOT3
%left  tOROP
%left  tANDOP
%nonassoc  tCMP tEQ tEQQ tNEQ tMATCH tNMATCH
%left  '>' tGEQ '<' tLEQ
%left  '|' '^'
%left  '&'
%left  tLSHFT tRSHFT
%left  '+' '-'
%left  '*' '/' '%'
%right tUMINUS_NUM tUMINUS
%right tPOW
%right '!' '~' tUPLUS

%nonassoc idNULL
%nonassoc idRespond_to
%nonassoc idIFUNC
%nonassoc idCFUNC
%nonassoc idThrowState
%nonassoc id_core_set_method_alias
%nonassoc id_core_set_variable_alias
%nonassoc id_core_undef_method
%nonassoc id_core_define_method
%nonassoc id_core_define_singleton_method
%nonassoc id_core_set_postexe

%token tLAST_TOKEN

%%
program		:  {
			lex_state = EXPR_BEG;
		    /*%%%*/
			$<num>$ = compile_for_eval || rb_parse_in_main();
			local_push($<num>$);
		    /*%
			local_push(0);
		    %*/
		    }
		  top_compstmt
		    {
		    /*%%%*/
			if ($2 && !$<num>1) {
			    /* last expression should not be void */
			    if (nd_type($2) != NODE_BLOCK) void_expr($2);
			    else {
				NODE *node = $2;
				while (node->nd_next) {
				    node = node->nd_next;
				}
				void_expr(node->nd_head);
			    }
			}
			ruby_eval_tree = NEW_SCOPE(0, block_append(ruby_eval_tree, $2));
		    /*%
			$$ = $2;
			parser->result = dispatch1(program, $$);
		    %*/
			local_pop();
		    }
		;

top_compstmt	: top_stmts opt_terms
		    {
		    /*%%%*/
			void_stmts($1);
			fixup_nodes(&deferred_nodes);
		    /*%
		    %*/
			$$ = $1;
		    }
		;

top_stmts	: none
                    {
		    /*%%%*/
			$$ = NEW_BEGIN(0);
		    /*%
			$$ = dispatch2(stmts_add, dispatch0(stmts_new),
						  dispatch0(void_stmt));
		    %*/
		    }
		| top_stmt
		    {
		    /*%%%*/
			$$ = newline_node($1);
		    /*%
			$$ = dispatch2(stmts_add, dispatch0(stmts_new), $1);
		    %*/
		    }
		| top_stmts terms top_stmt
		    {
		    /*%%%*/
			$$ = block_append($1, newline_node($3));
		    /*%
			$$ = dispatch2(stmts_add, $1, $3);
		    %*/
		    }
		| error top_stmt
		    {
			$$ = remove_begin($2);
		    }
		;

top_stmt	: stmt
		| keyword_BEGIN
		    {
			if (in_def || in_single) {
			    yyerror("BEGIN in method");
			}
		    /*%%%*/
			/* local_push(0); */
		    /*%
		    %*/
		    }
		  '{' top_compstmt '}'
		    {
		    /*%%%*/
			ruby_eval_tree_begin = block_append(ruby_eval_tree_begin,
							    $4);
			/* NEW_PREEXE($4)); */
			/* local_pop(); */
			$$ = NEW_BEGIN(0);
		    /*%
			$$ = dispatch1(BEGIN, $4);
		    %*/
		    }
		;

bodystmt	: compstmt
		  opt_rescue
		  opt_else
		  opt_ensure
		    {
		    /*%%%*/
			$$ = $1;
			if ($2) {
			    $$ = NEW_RESCUE($1, $2, $3);
			}
			else if ($3) {
			    rb_warn0("else without rescue is useless");
			    $$ = block_append($$, $3);
			}
			if ($4) {
			    if ($$) {
				$$ = NEW_ENSURE($$, $4);
			    }
			    else {
				$$ = block_append($4, NEW_NIL());
			    }
			}
			fixpos($$, $1);
		    /*%
			$$ = dispatch4(bodystmt,
				       escape_Qundef($1),
				       escape_Qundef($2),
				       escape_Qundef($3),
				       escape_Qundef($4));
		    %*/
		    }
		;

compstmt	: stmts opt_terms
		    {
		    /*%%%*/
			void_stmts($1);
			fixup_nodes(&deferred_nodes);
		    /*%
		    %*/
			$$ = $1;
		    }
		;

stmts		: none
                    {
		    /*%%%*/
			$$ = NEW_BEGIN(0);
		    /*%
			$$ = dispatch2(stmts_add, dispatch0(stmts_new),
						  dispatch0(void_stmt));
		    %*/
		    }
		| stmt
		    {
		    /*%%%*/
			$$ = newline_node($1);
		    /*%
			$$ = dispatch2(stmts_add, dispatch0(stmts_new), $1);
		    %*/
		    }
		| stmts terms stmt
		    {
		    /*%%%*/
			$$ = block_append($1, newline_node($3));
		    /*%
			$$ = dispatch2(stmts_add, $1, $3);
		    %*/
		    }
		| error stmt
		    {
			$$ = remove_begin($2);
		    }
		;

stmt		: keyword_alias fitem {lex_state = EXPR_FNAME;} fitem
		    {
		    /*%%%*/
			$$ = NEW_ALIAS($2, $4);
		    /*%
			$$ = dispatch2(alias, $2, $4);
		    %*/
		    }
		| keyword_alias tGVAR tGVAR
		    {
		    /*%%%*/
			$$ = NEW_VALIAS($2, $3);
		    /*%
			$$ = dispatch2(var_alias, $2, $3);
		    %*/
		    }
		| keyword_alias tGVAR tBACK_REF
		    {
		    /*%%%*/
			char buf[3];

			sprintf(buf, "$%c", (char)$3->nd_nth);
			$$ = NEW_VALIAS($2, rb_intern(buf));
		    /*%
			$$ = dispatch2(var_alias, $2, $3);
		    %*/
		    }
		| keyword_alias tGVAR tNTH_REF
		    {
		    /*%%%*/
			yyerror("can't make alias for the number variables");
			$$ = NEW_BEGIN(0);
		    /*%
			$$ = dispatch2(var_alias, $2, $3);
			$$ = dispatch1(alias_error, $$);
		    %*/
		    }
		| keyword_undef undef_list
		    {
		    /*%%%*/
			$$ = $2;
		    /*%
			$$ = dispatch1(undef, $2);
		    %*/
		    }
		| stmt modifier_if expr_value
		    {
		    /*%%%*/
			$$ = NEW_IF(cond($3), remove_begin($1), 0);
			fixpos($$, $3);
		    /*%
			$$ = dispatch2(if_mod, $3, $1);
		    %*/
		    }
		| stmt modifier_unless expr_value
		    {
		    /*%%%*/
			$$ = NEW_UNLESS(cond($3), remove_begin($1), 0);
			fixpos($$, $3);
		    /*%
			$$ = dispatch2(unless_mod, $3, $1);
		    %*/
		    }
		| stmt modifier_while expr_value
		    {
		    /*%%%*/
			if ($1 && nd_type($1) == NODE_BEGIN) {
			    $$ = NEW_WHILE(cond($3), $1->nd_body, 0);
			}
			else {
			    $$ = NEW_WHILE(cond($3), $1, 1);
			}
		    /*%
			$$ = dispatch2(while_mod, $3, $1);
		    %*/
		    }
		| stmt modifier_until expr_value
		    {
		    /*%%%*/
			if ($1 && nd_type($1) == NODE_BEGIN) {
			    $$ = NEW_UNTIL(cond($3), $1->nd_body, 0);
			}
			else {
			    $$ = NEW_UNTIL(cond($3), $1, 1);
			}
		    /*%
			$$ = dispatch2(until_mod, $3, $1);
		    %*/
		    }
		| stmt modifier_rescue stmt
		    {
		    /*%%%*/
			NODE *resq = NEW_RESBODY(0, remove_begin($3), 0);
			$$ = NEW_RESCUE(remove_begin($1), resq, 0);
		    /*%
			$$ = dispatch2(rescue_mod, $3, $1);
		    %*/
		    }
		| keyword_END '{' compstmt '}'
		    {
			if (in_def || in_single) {
			    rb_warn0("END in method; use at_exit");
			}
		    /*%%%*/
			$$ = NEW_POSTEXE(NEW_NODE(
			    NODE_SCOPE, 0 /* tbl */, $3 /* body */, 0 /* args */));
		    /*%
			$$ = dispatch1(END, $3);
		    %*/
		    }
		| lhs '=' command_call
		    {
		    /*%%%*/
			value_expr($3);
			$$ = node_assign($1, $3);
		    /*%
			$$ = dispatch2(assign, $1, $3);
		    %*/
		    }
		| mlhs '=' command_call
		    {
		    /*%%%*/
			value_expr($3);
			$1->nd_value = $3;
			$$ = $1;
		    /*%
			$$ = dispatch2(massign, $1, $3);
		    %*/
		    }
		| var_lhs tOP_ASGN command_call
		    {
		    /*%%%*/
			value_expr($3);
			if ($1) {
			    ID vid = $1->nd_vid;
			    if ($2 == tOROP) {
				$1->nd_value = $3;
				$$ = NEW_OP_ASGN_OR(gettable(vid), $1);
				if (is_asgn_or_id(vid)) {
				    $$->nd_aid = vid;
				}
			    }
			    else if ($2 == tANDOP) {
				$1->nd_value = $3;
				$$ = NEW_OP_ASGN_AND(gettable(vid), $1);
			    }
			    else {
				$$ = $1;
				$$->nd_value = NEW_CALL(gettable(vid), $2, NEW_LIST($3));
			    }
			}
			else {
			    $$ = NEW_BEGIN(0);
			}
		    /*%
			$$ = dispatch3(opassign, $1, $2, $3);
		    %*/
		    }
		| primary_value '[' opt_call_args rbracket tOP_ASGN command_call
		    {
		    /*%%%*/
			NODE *args;

			value_expr($6);
			if (!$3) $3 = NEW_ZARRAY();
			args = arg_concat($3, $6);
			if ($5 == tOROP) {
			    $5 = 0;
			}
			else if ($5 == tANDOP) {
			    $5 = 1;
			}
			$$ = NEW_OP_ASGN1($1, $5, args);
			fixpos($$, $1);
		    /*%
			$$ = dispatch2(aref_field, $1, escape_Qundef($3));
			$$ = dispatch3(opassign, $$, $5, $6);
		    %*/
		    }
		| primary_value '.' tIDENTIFIER tOP_ASGN command_call
		    {
		    /*%%%*/
			value_expr($5);
			if ($4 == tOROP) {
			    $4 = 0;
			}
			else if ($4 == tANDOP) {
			    $4 = 1;
			}
			$$ = NEW_OP_ASGN2($1, $3, $4, $5);
			fixpos($$, $1);
		    /*%
			$$ = dispatch3(field, $1, ripper_id2sym('.'), $3);
			$$ = dispatch3(opassign, $$, $4, $5);
		    %*/
		    }
		| primary_value '.' tCONSTANT tOP_ASGN command_call
		    {
		    /*%%%*/
			value_expr($5);
			if ($4 == tOROP) {
			    $4 = 0;
			}
			else if ($4 == tANDOP) {
			    $4 = 1;
			}
			$$ = NEW_OP_ASGN2($1, $3, $4, $5);
			fixpos($$, $1);
		    /*%
			$$ = dispatch3(field, $1, ripper_id2sym('.'), $3);
			$$ = dispatch3(opassign, $$, $4, $5);
		    %*/
		    }
		| primary_value tCOLON2 tIDENTIFIER tOP_ASGN command_call
		    {
		    /*%%%*/
			value_expr($5);
			if ($4 == tOROP) {
			    $4 = 0;
			}
			else if ($4 == tANDOP) {
			    $4 = 1;
			}
			$$ = NEW_OP_ASGN2($1, $3, $4, $5);
			fixpos($$, $1);
		    /*%
			$$ = dispatch3(field, $1, ripper_intern("::"), $3);
			$$ = dispatch3(opassign, $$, $4, $5);
		    %*/
		    }
		| backref tOP_ASGN command_call
		    {
		    /*%%%*/
			rb_backref_error($1);
			$$ = NEW_BEGIN(0);
		    /*%
			$$ = dispatch2(assign, dispatch1(var_field, $1), $3);
			$$ = dispatch1(assign_error, $$);
		    %*/
		    }
		| lhs '=' mrhs
		    {
		    /*%%%*/
			value_expr($3);
			$$ = node_assign($1, $3);
		    /*%
			$$ = dispatch2(assign, $1, $3);
		    %*/
		    }
		| mlhs '=' arg_value
		    {
		    /*%%%*/
			$1->nd_value = $3;
			$$ = $1;
		    /*%
			$$ = dispatch2(massign, $1, $3);
		    %*/
		    }
		| mlhs '=' mrhs
		    {
		    /*%%%*/
			$1->nd_value = $3;
			$$ = $1;
		    /*%
			$$ = dispatch2(massign, $1, $3);
		    %*/
		    }
		| expr
		;

expr		: command_call
		| expr keyword_and expr
		    {
		    /*%%%*/
			$$ = logop(NODE_AND, $1, $3);
		    /*%
			$$ = dispatch3(binary, $1, ripper_intern("and"), $3);
		    %*/
		    }
		| expr keyword_or expr
		    {
		    /*%%%*/
			$$ = logop(NODE_OR, $1, $3);
		    /*%
			$$ = dispatch3(binary, $1, ripper_intern("or"), $3);
		    %*/
		    }
		| keyword_not opt_nl expr
		    {
		    /*%%%*/
			$$ = call_uni_op(cond($3), '!');
		    /*%
			$$ = dispatch2(unary, ripper_intern("not"), $3);
		    %*/
		    }
		| '!' command_call
		    {
		    /*%%%*/
			$$ = call_uni_op(cond($2), '!');
		    /*%
			$$ = dispatch2(unary, ripper_id2sym('!'), $2);
		    %*/
		    }
		| arg
		;

expr_value	: expr
		    {
		    /*%%%*/
			value_expr($1);
			$$ = $1;
		        if (!$$) $$ = NEW_NIL();
		    /*%
			$$ = $1;
		    %*/
		    }
		;

command_call	: command
		| block_command
		| keyword_return call_args
		    {
		    /*%%%*/
			$$ = NEW_RETURN(ret_args($2));
		    /*%
			$$ = dispatch1(return, $2);
		    %*/
		    }
		| keyword_break call_args
		    {
		    /*%%%*/
			$$ = NEW_BREAK(ret_args($2));
		    /*%
			$$ = dispatch1(break, $2);
		    %*/
		    }
		| keyword_next call_args
		    {
		    /*%%%*/
			$$ = NEW_NEXT(ret_args($2));
		    /*%
			$$ = dispatch1(next, $2);
		    %*/
		    }
		;

block_command	: block_call
		| block_call '.' operation2 command_args
		    {
		    /*%%%*/
			$$ = NEW_CALL($1, $3, $4);
		    /*%
			$$ = dispatch3(call, $1, ripper_id2sym('.'), $3);
			$$ = method_arg($$, $4);
		    %*/
		    }
		| block_call tCOLON2 operation2 command_args
		    {
		    /*%%%*/
			$$ = NEW_CALL($1, $3, $4);
		    /*%
			$$ = dispatch3(call, $1, ripper_intern("::"), $3);
			$$ = method_arg($$, $4);
		    %*/
		    }
		;

cmd_brace_block	: tLBRACE_ARG
		    {
			$<vars>1 = dyna_push();
		    /*%%%*/
			$<num>$ = ruby_sourceline;
		    /*%
		    %*/
		    }
		  opt_block_param
		  compstmt
		  '}'
		    {
		    /*%%%*/
			$$ = NEW_ITER($3,$4);
			nd_set_line($$, $<num>2);
		    /*%
			$$ = dispatch2(brace_block, escape_Qundef($3), $4);
		    %*/
			dyna_pop($<vars>1);
		    }
		;

command		: operation command_args       %prec tLOWEST
		    {
		    /*%%%*/
			$$ = NEW_FCALL($1, $2);
			fixpos($$, $2);
		    /*%
			$$ = dispatch2(command, $1, $2);
		    %*/
		    }
		| operation command_args cmd_brace_block
		    {
		    /*%%%*/
			block_dup_check($2,$3);
		        $3->nd_iter = NEW_FCALL($1, $2);
			$$ = $3;
			fixpos($$, $2);
		    /*%
			$$ = dispatch2(command, $1, $2);
			$$ = method_add_block($$, $3);
		    %*/
		    }
		| primary_value '.' operation2 command_args	%prec tLOWEST
		    {
		    /*%%%*/
			$$ = NEW_CALL($1, $3, $4);
			fixpos($$, $1);
		    /*%
			$$ = dispatch4(command_call, $1, ripper_id2sym('.'), $3, $4);
		    %*/
		    }
		| primary_value '.' operation2 command_args cmd_brace_block
		    {
		    /*%%%*/
			block_dup_check($4,$5);
		        $5->nd_iter = NEW_CALL($1, $3, $4);
			$$ = $5;
			fixpos($$, $1);
		    /*%
			$$ = dispatch4(command_call, $1, ripper_id2sym('.'), $3, $4);
			$$ = method_add_block($$, $5);
		    %*/
		   }
		| primary_value tCOLON2 operation2 command_args	%prec tLOWEST
		    {
		    /*%%%*/
			$$ = NEW_CALL($1, $3, $4);
			fixpos($$, $1);
		    /*%
			$$ = dispatch4(command_call, $1, ripper_intern("::"), $3, $4);
		    %*/
		    }
		| primary_value tCOLON2 operation2 command_args cmd_brace_block
		    {
		    /*%%%*/
			block_dup_check($4,$5);
		        $5->nd_iter = NEW_CALL($1, $3, $4);
			$$ = $5;
			fixpos($$, $1);
		    /*%
			$$ = dispatch4(command_call, $1, ripper_intern("::"), $3, $4);
			$$ = method_add_block($$, $5);
		    %*/
		   }
		| keyword_super command_args
		    {
		    /*%%%*/
			$$ = NEW_SUPER($2);
			fixpos($$, $2);
		    /*%
			$$ = dispatch1(super, $2);
		    %*/
		    }
		| keyword_yield command_args
		    {
		    /*%%%*/
			$$ = new_yield($2);
			fixpos($$, $2);
		    /*%
			$$ = dispatch1(yield, $2);
		    %*/
		    }
		;

mlhs		: mlhs_basic
		| tLPAREN mlhs_inner rparen
		    {
		    /*%%%*/
			$$ = $2;
		    /*%
			$$ = dispatch1(mlhs_paren, $2);
		    %*/
		    }
		;

mlhs_inner	: mlhs_basic
		| tLPAREN mlhs_inner rparen
		    {
		    /*%%%*/
			$$ = NEW_MASGN(NEW_LIST($2), 0);
		    /*%
			$$ = dispatch1(mlhs_paren, $2);
		    %*/
		    }
		;

mlhs_basic	: mlhs_head
		    {
		    /*%%%*/
			$$ = NEW_MASGN($1, 0);
		    /*%
			$$ = $1;
		    %*/
		    }
		| mlhs_head mlhs_item
		    {
		    /*%%%*/
			$$ = NEW_MASGN(list_append($1,$2), 0);
		    /*%
			$$ = mlhs_add($1, $2);
		    %*/
		    }
		| mlhs_head tSTAR mlhs_node
		    {
		    /*%%%*/
			$$ = NEW_MASGN($1, $3);
		    /*%
			$$ = mlhs_add_star($1, $3);
		    %*/
		    }
		| mlhs_head tSTAR mlhs_node ',' mlhs_post
		    {
		    /*%%%*/
			$$ = NEW_MASGN($1, NEW_POSTARG($3,$5));
		    /*%
			$1 = mlhs_add_star($1, $3);
			$$ = mlhs_add($1, $5);
		    %*/
		    }
		| mlhs_head tSTAR
		    {
		    /*%%%*/
			$$ = NEW_MASGN($1, -1);
		    /*%
			$$ = mlhs_add_star($1, Qnil);
		    %*/
		    }
		| mlhs_head tSTAR ',' mlhs_post
		    {
		    /*%%%*/
			$$ = NEW_MASGN($1, NEW_POSTARG(-1, $4));
		    /*%
			$$ = mlhs_add_star($1, Qnil);
		    %*/
		    }
		| tSTAR mlhs_node
		    {
		    /*%%%*/
			$$ = NEW_MASGN(0, $2);
		    /*%
			$$ = mlhs_add_star(mlhs_new(), $2);
		    %*/
		    }
		| tSTAR mlhs_node ',' mlhs_post
		    {
		    /*%%%*/
			$$ = NEW_MASGN(0, NEW_POSTARG($2,$4));
		    /*%
			$$ = mlhs_add_star(mlhs_new(), $2);
		    %*/
		    }
		| tSTAR
		    {
		    /*%%%*/
			$$ = NEW_MASGN(0, -1);
		    /*%
			$$ = mlhs_add_star(mlhs_new(), Qnil);
		    %*/
		    }
		| tSTAR ',' mlhs_post
		    {
		    /*%%%*/
			$$ = NEW_MASGN(0, NEW_POSTARG(-1, $3));
		    /*%
			$$ = mlhs_add_star(mlhs_new(), Qnil);
		    %*/
		    }
		;

mlhs_item	: mlhs_node
		| tLPAREN mlhs_inner rparen
		    {
		    /*%%%*/
			$$ = $2;
		    /*%
			$$ = dispatch1(mlhs_paren, $2);
		    %*/
		    }
		;

mlhs_head	: mlhs_item ','
		    {
		    /*%%%*/
			$$ = NEW_LIST($1);
		    /*%
			$$ = mlhs_add(mlhs_new(), $1);
		    %*/
		    }
		| mlhs_head mlhs_item ','
		    {
		    /*%%%*/
			$$ = list_append($1, $2);
		    /*%
			$$ = mlhs_add($1, $2);
		    %*/
		    }
		;

mlhs_post	: mlhs_item
		    {
		    /*%%%*/
			$$ = NEW_LIST($1);
		    /*%
			$$ = mlhs_add(mlhs_new(), $1);
		    %*/
		    }
		| mlhs_post ',' mlhs_item
		    {
		    /*%%%*/
			$$ = list_append($1, $3);
		    /*%
			$$ = mlhs_add($1, $3);
		    %*/
		    }
		;

mlhs_node	: variable
		    {
			$$ = assignable($1, 0);
		    }
		| primary_value '[' opt_call_args rbracket
		    {
		    /*%%%*/
			$$ = aryset($1, $3);
		    /*%
			$$ = dispatch2(aref_field, $1, escape_Qundef($3));
		    %*/
		    }
		| primary_value '.' tIDENTIFIER
		    {
		    /*%%%*/
			$$ = attrset($1, $3);
		    /*%
			$$ = dispatch3(field, $1, ripper_id2sym('.'), $3);
		    %*/
		    }
		| primary_value tCOLON2 tIDENTIFIER
		    {
		    /*%%%*/
			$$ = attrset($1, $3);
		    /*%
			$$ = dispatch2(const_path_field, $1, $3);
		    %*/
		    }
		| primary_value '.' tCONSTANT
		    {
		    /*%%%*/
			$$ = attrset($1, $3);
		    /*%
			$$ = dispatch3(field, $1, ripper_id2sym('.'), $3);
		    %*/
		    }
		| primary_value tCOLON2 tCONSTANT
		    {
		    /*%%%*/
			if (in_def || in_single)
			    yyerror("dynamic constant assignment");
			$$ = NEW_CDECL(0, 0, NEW_COLON2($1, $3));
		    /*%
			if (in_def || in_single)
			    yyerror("dynamic constant assignment");
			$$ = dispatch2(const_path_field, $1, $3);
		    %*/
		    }
		| tCOLON3 tCONSTANT
		    {
		    /*%%%*/
			if (in_def || in_single)
			    yyerror("dynamic constant assignment");
			$$ = NEW_CDECL(0, 0, NEW_COLON3($2));
		    /*%
			$$ = dispatch1(top_const_field, $2);
		    %*/
		    }
		| backref
		    {
		    /*%%%*/
			rb_backref_error($1);
			$$ = NEW_BEGIN(0);
		    /*%
			$$ = dispatch1(var_field, $1);
			$$ = dispatch1(assign_error, $$);
		    %*/
		    }
		;

lhs		: variable
		    {
			$$ = assignable($1, 0);
		    /*%%%*/
			if (!$$) $$ = NEW_BEGIN(0);
		    /*%
			$$ = dispatch1(var_field, $$);
		    %*/
		    }
		| primary_value '[' opt_call_args rbracket
		    {
		    /*%%%*/
			$$ = aryset($1, $3);
		    /*%
			$$ = dispatch2(aref_field, $1, escape_Qundef($3));
		    %*/
		    }
		| primary_value '.' tIDENTIFIER
		    {
		    /*%%%*/
			$$ = attrset($1, $3);
		    /*%
			$$ = dispatch3(field, $1, ripper_id2sym('.'), $3);
		    %*/
		    }
		| primary_value tCOLON2 tIDENTIFIER
		    {
		    /*%%%*/
			$$ = attrset($1, $3);
		    /*%
			$$ = dispatch3(field, $1, ripper_intern("::"), $3);
		    %*/
		    }
		| primary_value '.' tCONSTANT
		    {
		    /*%%%*/
			$$ = attrset($1, $3);
		    /*%
			$$ = dispatch3(field, $1, ripper_id2sym('.'), $3);
		    %*/
		    }
		| primary_value tCOLON2 tCONSTANT
		    {
		    /*%%%*/
			if (in_def || in_single)
			    yyerror("dynamic constant assignment");
			$$ = NEW_CDECL(0, 0, NEW_COLON2($1, $3));
		    /*%
			$$ = dispatch2(const_path_field, $1, $3);
			if (in_def || in_single) {
			    $$ = dispatch1(assign_error, $$);
			}
		    %*/
		    }
		| tCOLON3 tCONSTANT
		    {
		    /*%%%*/
			if (in_def || in_single)
			    yyerror("dynamic constant assignment");
			$$ = NEW_CDECL(0, 0, NEW_COLON3($2));
		    /*%
			$$ = dispatch1(top_const_field, $2);
			if (in_def || in_single) {
			    $$ = dispatch1(assign_error, $$);
			}
		    %*/
		    }
		| backref
		    {
		    /*%%%*/
			rb_backref_error($1);
			$$ = NEW_BEGIN(0);
		    /*%
			$$ = dispatch1(assign_error, $1);
		    %*/
		    }
		;

cname		: tIDENTIFIER
		    {
		    /*%%%*/
			yyerror("class/module name must be CONSTANT");
		    /*%
			$$ = dispatch1(class_name_error, $1);
		    %*/
		    }
		| tCONSTANT
		;

cpath		: tCOLON3 cname
		    {
		    /*%%%*/
			$$ = NEW_COLON3($2);
		    /*%
			$$ = dispatch1(top_const_ref, $2);
		    %*/
		    }
		| cname
		    {
		    /*%%%*/
			$$ = NEW_COLON2(0, $$);
		    /*%
			$$ = dispatch1(const_ref, $1);
		    %*/
		    }
		| primary_value tCOLON2 cname
		    {
		    /*%%%*/
			$$ = NEW_COLON2($1, $3);
		    /*%
			$$ = dispatch2(const_path_ref, $1, $3);
		    %*/
		    }
		;

fname		: tIDENTIFIER
		| tCONSTANT
		| tFID
		| op
		    {
		    /*%%%*/
			lex_state = EXPR_END;
			$$ = $1;
		    /*%
			lex_state = EXPR_END;
			$$ = $1;
		    %*/
		    }
		| reswords
		    {
		    /*%%%*/
			lex_state = EXPR_END;
			$$ = $<id>1;
		    /*%
			lex_state = EXPR_END;
			$$ = $1;
		    %*/
		    }
		;

fsym		: fname
		| symbol
		;

fitem		: fsym
		    {
		    /*%%%*/
			$$ = NEW_LIT(ID2SYM($1));
		    /*%
			$$ = dispatch1(symbol_literal, $1);
		    %*/
		    }
		| dsym
		;

undef_list	: fitem
		    {
		    /*%%%*/
			$$ = NEW_UNDEF($1);
		    /*%
			$$ = rb_ary_new3(1, $1);
		    %*/
		    }
		| undef_list ',' {lex_state = EXPR_FNAME;} fitem
		    {
		    /*%%%*/
			$$ = block_append($1, NEW_UNDEF($4));
		    /*%
			rb_ary_push($1, $4);
		    %*/
		    }
		;

op		: '|'		{ ifndef_ripper($$ = '|'); }
		| '^'		{ ifndef_ripper($$ = '^'); }
		| '&'		{ ifndef_ripper($$ = '&'); }
		| tCMP		{ ifndef_ripper($$ = tCMP); }
		| tEQ		{ ifndef_ripper($$ = tEQ); }
		| tEQQ		{ ifndef_ripper($$ = tEQQ); }
		| tMATCH	{ ifndef_ripper($$ = tMATCH); }
		| tNMATCH	{ ifndef_ripper($$ = tNMATCH); }
		| '>'		{ ifndef_ripper($$ = '>'); }
		| tGEQ		{ ifndef_ripper($$ = tGEQ); }
		| '<'		{ ifndef_ripper($$ = '<'); }
		| tLEQ		{ ifndef_ripper($$ = tLEQ); }
		| tNEQ		{ ifndef_ripper($$ = tNEQ); }
		| tLSHFT	{ ifndef_ripper($$ = tLSHFT); }
		| tRSHFT	{ ifndef_ripper($$ = tRSHFT); }
		| '+'		{ ifndef_ripper($$ = '+'); }
		| '-'		{ ifndef_ripper($$ = '-'); }
		| '*'		{ ifndef_ripper($$ = '*'); }
		| tSTAR		{ ifndef_ripper($$ = '*'); }
		| '/'		{ ifndef_ripper($$ = '/'); }
		| '%'		{ ifndef_ripper($$ = '%'); }
		| tPOW		{ ifndef_ripper($$ = tPOW); }
		| '!'		{ ifndef_ripper($$ = '!'); }
		| '~'		{ ifndef_ripper($$ = '~'); }
		| tUPLUS	{ ifndef_ripper($$ = tUPLUS); }
		| tUMINUS	{ ifndef_ripper($$ = tUMINUS); }
		| tAREF		{ ifndef_ripper($$ = tAREF); }
		| tASET		{ ifndef_ripper($$ = tASET); }
		| '`'		{ ifndef_ripper($$ = '`'); }
		;

reswords	: keyword__LINE__ | keyword__FILE__ | keyword__ENCODING__
		| keyword_BEGIN | keyword_END
		| keyword_alias | keyword_and | keyword_begin
		| keyword_break | keyword_case | keyword_class | keyword_def
		| keyword_defined | keyword_do | keyword_else | keyword_elsif
		| keyword_end | keyword_ensure | keyword_false
		| keyword_for | keyword_in | keyword_module | keyword_next
		| keyword_nil | keyword_not | keyword_or | keyword_redo
		| keyword_rescue | keyword_retry | keyword_return | keyword_self
		| keyword_super | keyword_then | keyword_true | keyword_undef
		| keyword_when | keyword_yield | keyword_if | keyword_unless
		| keyword_while | keyword_until
		;

arg		: lhs '=' arg
		    {
		    /*%%%*/
			value_expr($3);
			$$ = node_assign($1, $3);
		    /*%
			$$ = dispatch2(assign, $1, $3);
		    %*/
		    }
		| lhs '=' arg modifier_rescue arg
		    {
		    /*%%%*/
			value_expr($3);
		        $3 = NEW_RESCUE($3, NEW_RESBODY(0,$5,0), 0);
			$$ = node_assign($1, $3);
		    /*%
			$$ = dispatch2(assign, $1, dispatch2(rescue_mod, $3, $5));
		    %*/
		    }
		| var_lhs tOP_ASGN arg
		    {
		    /*%%%*/
			value_expr($3);
			if ($1) {
			    ID vid = $1->nd_vid;
			    if ($2 == tOROP) {
				$1->nd_value = $3;
				$$ = NEW_OP_ASGN_OR(gettable(vid), $1);
				if (is_asgn_or_id(vid)) {
				    $$->nd_aid = vid;
				}
			    }
			    else if ($2 == tANDOP) {
				$1->nd_value = $3;
				$$ = NEW_OP_ASGN_AND(gettable(vid), $1);
			    }
			    else {
				$$ = $1;
				$$->nd_value = NEW_CALL(gettable(vid), $2, NEW_LIST($3));
			    }
			}
			else {
			    $$ = NEW_BEGIN(0);
			}
		    /*%
			$$ = dispatch3(opassign, $1, $2, $3);
		    %*/
		    }
		| var_lhs tOP_ASGN arg modifier_rescue arg
		    {
		    /*%%%*/
			value_expr($3);
		        $3 = NEW_RESCUE($3, NEW_RESBODY(0,$5,0), 0);
			if ($1) {
			    ID vid = $1->nd_vid;
			    if ($2 == tOROP) {
				$1->nd_value = $3;
				$$ = NEW_OP_ASGN_OR(gettable(vid), $1);
				if (is_asgn_or_id(vid)) {
				    $$->nd_aid = vid;
				}
			    }
			    else if ($2 == tANDOP) {
				$1->nd_value = $3;
				$$ = NEW_OP_ASGN_AND(gettable(vid), $1);
			    }
			    else {
				$$ = $1;
				$$->nd_value = NEW_CALL(gettable(vid), $2, NEW_LIST($3));
			    }
			}
			else {
			    $$ = NEW_BEGIN(0);
			}
		    /*%
			$3 = dispatch2(rescue_mod, $3, $5);
			$$ = dispatch3(opassign, $1, $2, $3);
		    %*/
		    }
		| primary_value '[' opt_call_args rbracket tOP_ASGN arg
		    {
		    /*%%%*/
			NODE *args;

			value_expr($6);
			if (!$3) $3 = NEW_ZARRAY();
			args = arg_concat($3, $6);
			if ($5 == tOROP) {
			    $5 = 0;
			}
			else if ($5 == tANDOP) {
			    $5 = 1;
			}
			$$ = NEW_OP_ASGN1($1, $5, args);
			fixpos($$, $1);
		    /*%
			$1 = dispatch2(aref_field, $1, escape_Qundef($3));
			$$ = dispatch3(opassign, $1, $5, $6);
		    %*/
		    }
		| primary_value '.' tIDENTIFIER tOP_ASGN arg
		    {
		    /*%%%*/
			value_expr($5);
			if ($4 == tOROP) {
			    $4 = 0;
			}
			else if ($4 == tANDOP) {
			    $4 = 1;
			}
			$$ = NEW_OP_ASGN2($1, $3, $4, $5);
			fixpos($$, $1);
		    /*%
			$1 = dispatch3(field, $1, ripper_id2sym('.'), $3);
			$$ = dispatch3(opassign, $1, $4, $5);
		    %*/
		    }
		| primary_value '.' tCONSTANT tOP_ASGN arg
		    {
		    /*%%%*/
			value_expr($5);
			if ($4 == tOROP) {
			    $4 = 0;
			}
			else if ($4 == tANDOP) {
			    $4 = 1;
			}
			$$ = NEW_OP_ASGN2($1, $3, $4, $5);
			fixpos($$, $1);
		    /*%
			$1 = dispatch3(field, $1, ripper_id2sym('.'), $3);
			$$ = dispatch3(opassign, $1, $4, $5);
		    %*/
		    }
		| primary_value tCOLON2 tIDENTIFIER tOP_ASGN arg
		    {
		    /*%%%*/
			value_expr($5);
			if ($4 == tOROP) {
			    $4 = 0;
			}
			else if ($4 == tANDOP) {
			    $4 = 1;
			}
			$$ = NEW_OP_ASGN2($1, $3, $4, $5);
			fixpos($$, $1);
		    /*%
			$1 = dispatch3(field, $1, ripper_intern("::"), $3);
			$$ = dispatch3(opassign, $1, $4, $5);
		    %*/
		    }
		| primary_value tCOLON2 tCONSTANT tOP_ASGN arg
		    {
		    /*%%%*/
			yyerror("constant re-assignment");
			$$ = NEW_BEGIN(0);
		    /*%
			$$ = dispatch2(const_path_field, $1, $3);
			$$ = dispatch3(opassign, $$, $4, $5);
			$$ = dispatch1(assign_error, $$);
		    %*/
		    }
		| tCOLON3 tCONSTANT tOP_ASGN arg
		    {
		    /*%%%*/
			yyerror("constant re-assignment");
			$$ = NEW_BEGIN(0);
		    /*%
			$$ = dispatch1(top_const_field, $2);
			$$ = dispatch3(opassign, $$, $3, $4);
			$$ = dispatch1(assign_error, $$);
		    %*/
		    }
		| backref tOP_ASGN arg
		    {
		    /*%%%*/
			rb_backref_error($1);
			$$ = NEW_BEGIN(0);
		    /*%
			$$ = dispatch1(var_field, $1);
			$$ = dispatch3(opassign, $$, $2, $3);
			$$ = dispatch1(assign_error, $$);
		    %*/
		    }
		| arg tDOT2 arg
		    {
		    /*%%%*/
			value_expr($1);
			value_expr($3);
			$$ = NEW_DOT2($1, $3);
			if (nd_type($1) == NODE_LIT && FIXNUM_P($1->nd_lit) &&
			    nd_type($3) == NODE_LIT && FIXNUM_P($3->nd_lit)) {
			    deferred_nodes = list_append(deferred_nodes, $$);
			}
		    /*%
			$$ = dispatch2(dot2, $1, $3);
		    %*/
		    }
		| arg tDOT3 arg
		    {
		    /*%%%*/
			value_expr($1);
			value_expr($3);
			$$ = NEW_DOT3($1, $3);
			if (nd_type($1) == NODE_LIT && FIXNUM_P($1->nd_lit) &&
			    nd_type($3) == NODE_LIT && FIXNUM_P($3->nd_lit)) {
			    deferred_nodes = list_append(deferred_nodes, $$);
			}
		    /*%
			$$ = dispatch2(dot3, $1, $3);
		    %*/
		    }
		| arg '+' arg
		    {
		    /*%%%*/
			$$ = call_bin_op($1, '+', $3);
		    /*%
			$$ = dispatch3(binary, $1, ID2SYM('+'), $3);
		    %*/
		    }
		| arg '-' arg
		    {
		    /*%%%*/
			$$ = call_bin_op($1, '-', $3);
		    /*%
			$$ = dispatch3(binary, $1, ID2SYM('-'), $3);
		    %*/
		    }
		| arg '*' arg
		    {
		    /*%%%*/
			$$ = call_bin_op($1, '*', $3);
		    /*%
			$$ = dispatch3(binary, $1, ID2SYM('*'), $3);
		    %*/
		    }
		| arg '/' arg
		    {
		    /*%%%*/
			$$ = call_bin_op($1, '/', $3);
		    /*%
			$$ = dispatch3(binary, $1, ID2SYM('/'), $3);
		    %*/
		    }
		| arg '%' arg
		    {
		    /*%%%*/
			$$ = call_bin_op($1, '%', $3);
		    /*%
			$$ = dispatch3(binary, $1, ID2SYM('%'), $3);
		    %*/
		    }
		| arg tPOW arg
		    {
		    /*%%%*/
			$$ = call_bin_op($1, tPOW, $3);
		    /*%
			$$ = dispatch3(binary, $1, ripper_intern("**"), $3);
		    %*/
		    }
		| tUMINUS_NUM tINTEGER tPOW arg
		    {
		    /*%%%*/
			$$ = NEW_CALL(call_bin_op($2, tPOW, $4), tUMINUS, 0);
		    /*%
			$$ = dispatch3(binary, $2, ripper_intern("**"), $4);
			$$ = dispatch2(unary, ripper_intern("-@"), $$);
		    %*/
		    }
		| tUMINUS_NUM tFLOAT tPOW arg
		    {
		    /*%%%*/
			$$ = NEW_CALL(call_bin_op($2, tPOW, $4), tUMINUS, 0);
		    /*%
			$$ = dispatch3(binary, $2, ripper_intern("**"), $4);
			$$ = dispatch2(unary, ripper_intern("-@"), $$);
		    %*/
		    }
		| tUPLUS arg
		    {
		    /*%%%*/
			$$ = call_uni_op($2, tUPLUS);
		    /*%
			$$ = dispatch2(unary, ripper_intern("+@"), $2);
		    %*/
		    }
		| tUMINUS arg
		    {
		    /*%%%*/
			$$ = call_uni_op($2, tUMINUS);
		    /*%
			$$ = dispatch2(unary, ripper_intern("-@"), $2);
		    %*/
		    }
		| arg '|' arg
		    {
		    /*%%%*/
			$$ = call_bin_op($1, '|', $3);
		    /*%
			$$ = dispatch3(binary, $1, ID2SYM('|'), $3);
		    %*/
		    }
		| arg '^' arg
		    {
		    /*%%%*/
			$$ = call_bin_op($1, '^', $3);
		    /*%
			$$ = dispatch3(binary, $1, ID2SYM('^'), $3);
		    %*/
		    }
		| arg '&' arg
		    {
		    /*%%%*/
			$$ = call_bin_op($1, '&', $3);
		    /*%
			$$ = dispatch3(binary, $1, ID2SYM('&'), $3);
		    %*/
		    }
		| arg tCMP arg
		    {
		    /*%%%*/
			$$ = call_bin_op($1, tCMP, $3);
		    /*%
			$$ = dispatch3(binary, $1, ripper_intern("<=>"), $3);
		    %*/
		    }
		| arg '>' arg
		    {
		    /*%%%*/
			$$ = call_bin_op($1, '>', $3);
		    /*%
			$$ = dispatch3(binary, $1, ID2SYM('>'), $3);
		    %*/
		    }
		| arg tGEQ arg
		    {
		    /*%%%*/
			$$ = call_bin_op($1, tGEQ, $3);
		    /*%
			$$ = dispatch3(binary, $1, ripper_intern(">="), $3);
		    %*/
		    }
		| arg '<' arg
		    {
		    /*%%%*/
			$$ = call_bin_op($1, '<', $3);
		    /*%
			$$ = dispatch3(binary, $1, ID2SYM('<'), $3);
		    %*/
		    }
		| arg tLEQ arg
		    {
		    /*%%%*/
			$$ = call_bin_op($1, tLEQ, $3);
		    /*%
			$$ = dispatch3(binary, $1, ripper_intern("<="), $3);
		    %*/
		    }
		| arg tEQ arg
		    {
		    /*%%%*/
			$$ = call_bin_op($1, tEQ, $3);
		    /*%
			$$ = dispatch3(binary, $1, ripper_intern("=="), $3);
		    %*/
		    }
		| arg tEQQ arg
		    {
		    /*%%%*/
			$$ = call_bin_op($1, tEQQ, $3);
		    /*%
			$$ = dispatch3(binary, $1, ripper_intern("==="), $3);
		    %*/
		    }
		| arg tNEQ arg
		    {
		    /*%%%*/
			$$ = call_bin_op($1, tNEQ, $3);
		    /*%
			$$ = dispatch3(binary, $1, ripper_intern("!="), $3);
		    %*/
		    }
		| arg tMATCH arg
		    {
		    /*%%%*/
			$$ = match_op($1, $3);
                        if (nd_type($1) == NODE_LIT && TYPE($1->nd_lit) == T_REGEXP) {
                            $$ = reg_named_capture_assign($1->nd_lit, $$);
                        }
		    /*%
			$$ = dispatch3(binary, $1, ripper_intern("=~"), $3);
		    %*/
		    }
		| arg tNMATCH arg
		    {
		    /*%%%*/
			$$ = call_bin_op($1, tNMATCH, $3);
		    /*%
			$$ = dispatch3(binary, $1, ripper_intern("!~"), $3);
		    %*/
		    }
		| '!' arg
		    {
		    /*%%%*/
			$$ = call_uni_op(cond($2), '!');
		    /*%
			$$ = dispatch2(unary, ID2SYM('!'), $2);
		    %*/
		    }
		| '~' arg
		    {
		    /*%%%*/
			$$ = call_uni_op($2, '~');
		    /*%
			$$ = dispatch2(unary, ID2SYM('~'), $2);
		    %*/
		    }
		| arg tLSHFT arg
		    {
		    /*%%%*/
			$$ = call_bin_op($1, tLSHFT, $3);
		    /*%
			$$ = dispatch3(binary, $1, ripper_intern("<<"), $3);
		    %*/
		    }
		| arg tRSHFT arg
		    {
		    /*%%%*/
			$$ = call_bin_op($1, tRSHFT, $3);
		    /*%
			$$ = dispatch3(binary, $1, ripper_intern(">>"), $3);
		    %*/
		    }
		| arg tANDOP arg
		    {
		    /*%%%*/
			$$ = logop(NODE_AND, $1, $3);
		    /*%
			$$ = dispatch3(binary, $1, ripper_intern("&&"), $3);
		    %*/
		    }
		| arg tOROP arg
		    {
		    /*%%%*/
			$$ = logop(NODE_OR, $1, $3);
		    /*%
			$$ = dispatch3(binary, $1, ripper_intern("||"), $3);
		    %*/
		    }
		| keyword_defined opt_nl {in_defined = 1;} arg
		    {
		    /*%%%*/
			in_defined = 0;
			$$ = NEW_DEFINED($4);
		    /*%
			in_defined = 0;
			$$ = dispatch1(defined, $4);
		    %*/
		    }
		| arg '?' arg opt_nl ':' arg
		    {
		    /*%%%*/
			value_expr($1);
			$$ = NEW_IF(cond($1), $3, $6);
			fixpos($$, $1);
		    /*%
			$$ = dispatch3(ifop, $1, $3, $6);
		    %*/
		    }
		| primary
		    {
			$$ = $1;
		    }
		;

arg_value	: arg
		    {
		    /*%%%*/
			value_expr($1);
			$$ = $1;
		        if (!$$) $$ = NEW_NIL();
		    /*%
			$$ = $1;
		    %*/
		    }
		;

aref_args	: none
		| args trailer
		    {
			$$ = $1;
		    }
		| args ',' assocs trailer
		    {
		    /*%%%*/
			$$ = arg_append($1, NEW_HASH($3));
		    /*%
			$$ = arg_add_assocs($1, $3);
		    %*/
		    }
		| assocs trailer
		    {
		    /*%%%*/
			$$ = NEW_LIST(NEW_HASH($1));
		    /*%
			$$ = arg_add_assocs(arg_new(), $1);
		    %*/
		    }
		;

paren_args	: '(' opt_call_args rparen
		    {
		    /*%%%*/
			$$ = $2;
		    /*%
			$$ = dispatch1(arg_paren, escape_Qundef($2));
		    %*/
		    }
		;

opt_paren_args	: none
		| paren_args
		;

opt_call_args	: none
		| call_args
		;

call_args	: command
		    {
		    /*%%%*/
			$$ = NEW_LIST($1);
		    /*%
			$$ = arg_add(arg_new(), $1);
		    %*/
		    }
		| args opt_block_arg
		    {
		    /*%%%*/
			$$ = arg_blk_pass($1, $2);
		    /*%
			$$ = arg_add_optblock($1, $2);
		    %*/
		    }
		| assocs opt_block_arg
		    {
		    /*%%%*/
			$$ = NEW_LIST(NEW_HASH($1));
			$$ = arg_blk_pass($$, $2);
		    /*%
			$$ = arg_add_assocs(arg_new(), $1);
			$$ = arg_add_optblock($$, $2);
		    %*/
		    }
		| args ',' assocs opt_block_arg
		    {
		    /*%%%*/
			$$ = arg_append($1, NEW_HASH($3));
			$$ = arg_blk_pass($$, $4);
		    /*%
			$$ = arg_add_optblock(arg_add_assocs($1, $3), $4);
		    %*/
		    }
		| block_arg
		    /*%c%*/
		    /*%c
		    {
			$$ = arg_add_block(arg_new(), $1);
		    }
		    %*/
		;

command_args	:  {
			$<num>$ = cmdarg_stack;
			CMDARG_PUSH(1);
		    }
		  call_args
		    {
			/* CMDARG_POP() */
			cmdarg_stack = $<num>1;
			$$ = $2;
		    }
		;

block_arg	: tAMPER arg_value
		    {
		    /*%%%*/
			$$ = NEW_BLOCK_PASS($2);
		    /*%
			$$ = $2;
		    %*/
		    }
		;

opt_block_arg	: ',' block_arg
		    {
			$$ = $2;
		    }
		| ','
		    {
			$$ = 0;
		    }
		| none
		    {
			$$ = 0;
		    }
		;

args		: arg_value
		    {
		    /*%%%*/
			$$ = NEW_LIST($1);
		    /*%
			$$ = arg_add(arg_new(), $1);
		    %*/
		    }
		| tSTAR arg_value
		    {
		    /*%%%*/
			$$ = NEW_SPLAT($2);
		    /*%
			$$ = arg_add_star(arg_new(), $2);
		    %*/
		    }
		| args ',' arg_value
		    {
		    /*%%%*/
			NODE *n1;
			if ((n1 = splat_array($1)) != 0) {
			    $$ = list_append(n1, $3);
			}
			else {
			    $$ = arg_append($1, $3);
			}
		    /*%
			$$ = arg_add($1, $3);
		    %*/
		    }
		| args ',' tSTAR arg_value
		    {
		    /*%%%*/
			NODE *n1;
			if ((nd_type($4) == NODE_ARRAY) && (n1 = splat_array($1)) != 0) {
			    $$ = list_concat(n1, $4);
			}
			else {
			    $$ = arg_concat($1, $4);
			}
		    /*%
			$$ = arg_add_star($1, $4);
		    %*/
		    }
		;

mrhs		: args ',' arg_value
		    {
		    /*%%%*/
			NODE *n1;
			if ((n1 = splat_array($1)) != 0) {
			    $$ = list_append(n1, $3);
			}
			else {
			    $$ = arg_append($1, $3);
			}
		    /*%
			$$ = mrhs_add(args2mrhs($1), $3);
		    %*/
		    }
		| args ',' tSTAR arg_value
		    {
		    /*%%%*/
			NODE *n1;
			if (nd_type($4) == NODE_ARRAY &&
			    (n1 = splat_array($1)) != 0) {
			    $$ = list_concat(n1, $4);
			}
			else {
			    $$ = arg_concat($1, $4);
			}
		    /*%
			$$ = mrhs_add_star(args2mrhs($1), $4);
		    %*/
		    }
		| tSTAR arg_value
		    {
		    /*%%%*/
			$$ = NEW_SPLAT($2);
		    /*%
			$$ = mrhs_add_star(mrhs_new(), $2);
		    %*/
		    }
		;

primary		: literal
		| strings
		| xstring
		| regexp
		| words
		| qwords
		| var_ref
		| backref
		| tFID
		    {
		    /*%%%*/
			$$ = NEW_FCALL($1, 0);
		    /*%
			$$ = method_arg(dispatch1(fcall, $1), arg_new());
		    %*/
		    }
		| k_begin
		    {
		    /*%%%*/
			$<num>$ = ruby_sourceline;
		    /*%
		    %*/
		    }
		  bodystmt
		  k_end
		    {
		    /*%%%*/
			if ($3 == NULL) {
			    $$ = NEW_NIL();
			}
			else {
			    if (nd_type($3) == NODE_RESCUE ||
				nd_type($3) == NODE_ENSURE)
				nd_set_line($3, $<num>2);
			    $$ = NEW_BEGIN($3);
			}
			nd_set_line($$, $<num>2);
		    /*%
			$$ = dispatch1(begin, $3);
		    %*/
		    }
		| tLPAREN_ARG expr {lex_state = EXPR_ENDARG;} rparen
		    {
			rb_warning0("(...) interpreted as grouped expression");
		    /*%%%*/
			$$ = $2;
		    /*%
			$$ = dispatch1(paren, $2);
		    %*/
		    }
		| tLPAREN compstmt ')'
		    {
		    /*%%%*/
			$$ = $2;
		    /*%
			$$ = dispatch1(paren, $2);
		    %*/
		    }
		| primary_value tCOLON2 tCONSTANT
		    {
		    /*%%%*/
			$$ = NEW_COLON2($1, $3);
		    /*%
			$$ = dispatch2(const_path_ref, $1, $3);
		    %*/
		    }
		| tCOLON3 tCONSTANT
		    {
		    /*%%%*/
			$$ = NEW_COLON3($2);
		    /*%
			$$ = dispatch1(top_const_ref, $2);
		    %*/
		    }
		| tLBRACK aref_args ']'
		    {
		    /*%%%*/
			if ($2 == 0) {
			    $$ = NEW_ZARRAY(); /* zero length array*/
			}
			else {
			    $$ = $2;
			}
		    /*%
			$$ = dispatch1(array, escape_Qundef($2));
		    %*/
		    }
		| tLBRACE assoc_list '}'
		    {
		    /*%%%*/
			$$ = NEW_HASH($2);
		    /*%
			$$ = dispatch1(hash, escape_Qundef($2));
		    %*/
		    }
		| keyword_return
		    {
		    /*%%%*/
			$$ = NEW_RETURN(0);
		    /*%
			$$ = dispatch0(return0);
		    %*/
		    }
		| keyword_yield '(' call_args rparen
		    {
		    /*%%%*/
			$$ = new_yield($3);
		    /*%
			$$ = dispatch1(yield, dispatch1(paren, $3));
		    %*/
		    }
		| keyword_yield '(' rparen
		    {
		    /*%%%*/
			$$ = NEW_YIELD(0, Qfalse);
		    /*%
			$$ = dispatch1(yield, dispatch1(paren, arg_new()));
		    %*/
		    }
		| keyword_yield
		    {
		    /*%%%*/
			$$ = NEW_YIELD(0, Qfalse);
		    /*%
			$$ = dispatch0(yield0);
		    %*/
		    }
		| keyword_defined opt_nl '(' {in_defined = 1;} expr rparen
		    {
		    /*%%%*/
			in_defined = 0;
			$$ = NEW_DEFINED($5);
		    /*%
			in_defined = 0;
			$$ = dispatch1(defined, $5);
		    %*/
		    }
		| keyword_not '(' expr rparen
		    {
		    /*%%%*/
			$$ = call_uni_op(cond($3), '!');
		    /*%
			$$ = dispatch2(unary, ripper_intern("not"), $3);
		    %*/
		    }
		| keyword_not '(' rparen
		    {
		    /*%%%*/
			$$ = call_uni_op(cond(NEW_NIL()), '!');
		    /*%
			$$ = dispatch2(unary, ripper_intern("not"), Qnil);
		    %*/
		    }
		| operation brace_block
		    {
		    /*%%%*/
			$2->nd_iter = NEW_FCALL($1, 0);
			$$ = $2;
			fixpos($2->nd_iter, $2);
		    /*%
			$$ = method_arg(dispatch1(fcall, $1), arg_new());
			$$ = method_add_block($$, $2);
		    %*/
		    }
		| method_call
		| method_call brace_block
		    {
		    /*%%%*/
			block_dup_check($1->nd_args, $2);
			$2->nd_iter = $1;
			$$ = $2;
			fixpos($$, $1);
		    /*%
			$$ = method_add_block($1, $2);
		    %*/
		    }
		| tLAMBDA lambda
		    {
			$$ = $2;
		    }
		| k_if expr_value then
		  compstmt
		  if_tail
		  k_end
		    {
		    /*%%%*/
			$$ = NEW_IF(cond($2), $4, $5);
			fixpos($$, $2);
		    /*%
			$$ = dispatch3(if, $2, $4, escape_Qundef($5));
		    %*/
		    }
		| k_unless expr_value then
		  compstmt
		  opt_else
		  k_end
		    {
		    /*%%%*/
			$$ = NEW_UNLESS(cond($2), $4, $5);
			fixpos($$, $2);
		    /*%
			$$ = dispatch3(unless, $2, $4, escape_Qundef($5));
		    %*/
		    }
		| k_while {COND_PUSH(1);} expr_value do {COND_POP();}
		  compstmt
		  k_end
		    {
		    /*%%%*/
			$$ = NEW_WHILE(cond($3), $6, 1);
			fixpos($$, $3);
		    /*%
			$$ = dispatch2(while, $3, $6);
		    %*/
		    }
		| k_until {COND_PUSH(1);} expr_value do {COND_POP();}
		  compstmt
		  k_end
		    {
		    /*%%%*/
			$$ = NEW_UNTIL(cond($3), $6, 1);
			fixpos($$, $3);
		    /*%
			$$ = dispatch2(until, $3, $6);
		    %*/
		    }
		| k_case expr_value opt_terms
		  case_body
		  k_end
		    {
		    /*%%%*/
			$$ = NEW_CASE($2, $4);
			fixpos($$, $2);
		    /*%
			$$ = dispatch2(case, $2, $4);
		    %*/
		    }
		| k_case opt_terms case_body k_end
		    {
		    /*%%%*/
			$$ = NEW_CASE(0, $3);
		    /*%
			$$ = dispatch2(case, Qnil, $3);
		    %*/
		    }
		| k_for for_var keyword_in
		  {COND_PUSH(1);}
		  expr_value do
		  {COND_POP();}
		  compstmt
		  k_end
		    {
		    /*%%%*/
			/*
			 *  for a, b, c in e
			 *  #=>
			 *  e.each{|*x| a, b, c = x
			 *
			 *  for a in e
			 *  #=>
			 *  e.each{|x| a, = x}
			 */
			ID id = internal_id();
			ID *tbl = ALLOC_N(ID, 2);
			NODE *m = NEW_ARGS_AUX(0, 0);
			NODE *args, *scope;

			if (nd_type($2) == NODE_MASGN) {
			    /* if args.length == 1 && args[0].kind_of?(Array)
			     *   args = args[0]
			     * end
			     */
			    NODE *one = NEW_LIST(NEW_LIT(INT2FIX(1)));
			    NODE *zero = NEW_LIST(NEW_LIT(INT2FIX(0)));
			    m->nd_next = block_append(
				NEW_IF(
				    NEW_NODE(NODE_AND,
					     NEW_CALL(NEW_CALL(NEW_DVAR(id), rb_intern("length"), 0),
						      rb_intern("=="), one),
					     NEW_CALL(NEW_CALL(NEW_DVAR(id), rb_intern("[]"), zero),
						      rb_intern("kind_of?"), NEW_LIST(NEW_LIT(rb_cArray))),
					     0),
				    NEW_DASGN_CURR(id,
						   NEW_CALL(NEW_DVAR(id), rb_intern("[]"), zero)),
				    0),
				node_assign($2, NEW_DVAR(id)));

			    args = new_args(m, 0, id, 0, 0);
			}
			else {
			    if (nd_type($2) == NODE_LASGN ||
				nd_type($2) == NODE_DASGN ||
				nd_type($2) == NODE_DASGN_CURR) {
				$2->nd_value = NEW_DVAR(id);
				m->nd_plen = 1;
				m->nd_next = $2;
				args = new_args(m, 0, 0, 0, 0);
			    }
			    else {
				m->nd_next = node_assign(NEW_MASGN(NEW_LIST($2), 0), NEW_DVAR(id));
				args = new_args(m, 0, id, 0, 0);
			    }
			}
			scope = NEW_NODE(NODE_SCOPE, tbl, $8, args);
			tbl[0] = 1; tbl[1] = id;
			$$ = NEW_FOR(0, $5, scope);
			fixpos($$, $2);
		    /*%
			$$ = dispatch3(for, $2, $5, $8);
		    %*/
		    }
		| k_class cpath superclass
		    {
			if (in_def || in_single)
			    yyerror("class definition in method body");
			local_push(0);
		    /*%%%*/
			$<num>$ = ruby_sourceline;
		    /*%
		    %*/
		    }
		  bodystmt
		  k_end
		    {
		    /*%%%*/
			$$ = NEW_CLASS($2, $5, $3);
			nd_set_line($$, $<num>4);
		    /*%
			$$ = dispatch3(class, $2, $3, $5);
		    %*/
			local_pop();
		    }
		| k_class tLSHFT expr
		    {
			$<num>$ = in_def;
			in_def = 0;
		    }
		  term
		    {
			$<num>$ = in_single;
			in_single = 0;
			local_push(0);
		    }
		  bodystmt
		  k_end
		    {
		    /*%%%*/
			$$ = NEW_SCLASS($3, $7);
			fixpos($$, $3);
		    /*%
			$$ = dispatch2(sclass, $3, $7);
		    %*/
			local_pop();
			in_def = $<num>4;
			in_single = $<num>6;
		    }
		| k_module cpath
		    {
			if (in_def || in_single)
			    yyerror("module definition in method body");
			local_push(0);
		    /*%%%*/
			$<num>$ = ruby_sourceline;
		    /*%
		    %*/
		    }
		  bodystmt
		  k_end
		    {
		    /*%%%*/
			$$ = NEW_MODULE($2, $4);
			nd_set_line($$, $<num>3);
		    /*%
			$$ = dispatch2(module, $2, $4);
		    %*/
			local_pop();
		    }
		| k_def fname
		    {
			$<id>$ = cur_mid;
			cur_mid = $2;
			in_def++;
			local_push(0);
		    }
		  f_arglist
		  bodystmt
		  k_end
		    {
		    /*%%%*/
			NODE *body = remove_begin($5);
			reduce_nodes(&body);
			$$ = NEW_DEFN($2, $4, body, NOEX_PRIVATE);
			fixpos($$, $4);
		    /*%
			$$ = dispatch3(def, $2, $4, $5);
		    %*/
			local_pop();
			in_def--;
			cur_mid = $<id>3;
		    }
		| k_def singleton dot_or_colon {lex_state = EXPR_FNAME;} fname
		    {
			in_single++;
			lex_state = EXPR_END; /* force for args */
			local_push(0);
		    }
		  f_arglist
		  bodystmt
		  k_end
		    {
		    /*%%%*/
			NODE *body = remove_begin($8);
			reduce_nodes(&body);
			$$ = NEW_DEFS($2, $5, $7, body);
			fixpos($$, $2);
		    /*%
			$$ = dispatch5(defs, $2, $3, $5, $7, $8);
		    %*/
			local_pop();
			in_single--;
		    }
		| keyword_break
		    {
		    /*%%%*/
			$$ = NEW_BREAK(0);
		    /*%
			$$ = dispatch1(break, arg_new());
		    %*/
		    }
		| keyword_next
		    {
		    /*%%%*/
			$$ = NEW_NEXT(0);
		    /*%
			$$ = dispatch1(next, arg_new());
		    %*/
		    }
		| keyword_redo
		    {
		    /*%%%*/
			$$ = NEW_REDO();
		    /*%
			$$ = dispatch0(redo);
		    %*/
		    }
		| keyword_retry
		    {
		    /*%%%*/
			$$ = NEW_RETRY();
		    /*%
			$$ = dispatch0(retry);
		    %*/
		    }
		;

primary_value	: primary
		    {
		    /*%%%*/
			value_expr($1);
			$$ = $1;
		        if (!$$) $$ = NEW_NIL();
		    /*%
			$$ = $1;
		    %*/
		    }
		;

k_begin		: keyword_begin
		    {
#ifndef RIPPER
			if (RTEST(ruby_verbose)) token_info_push(parser, "begin");
#endif
		    }

k_if		: keyword_if
		    {
#ifndef RIPPER
			if (RTEST(ruby_verbose)) token_info_push(parser, "if");
#endif
		    }

k_unless	: keyword_unless
		    {
#ifndef RIPPER
			if (RTEST(ruby_verbose)) token_info_push(parser, "unless");
#endif
		    }

k_while		: keyword_while
		    {
#ifndef RIPPER
			if (RTEST(ruby_verbose)) token_info_push(parser, "while");
#endif
		    }

k_until		: keyword_until
		    {
#ifndef RIPPER
			if (RTEST(ruby_verbose)) token_info_push(parser, "until");
#endif
		    }

k_case		: keyword_case
		    {
#ifndef RIPPER
			if (RTEST(ruby_verbose)) token_info_push(parser, "case");
#endif
		    }

k_for		: keyword_for
		    {
#ifndef RIPPER
			if (RTEST(ruby_verbose)) token_info_push(parser, "for");
#endif
		    }

k_class		: keyword_class
		    {
#ifndef RIPPER
			if (RTEST(ruby_verbose)) token_info_push(parser, "class");
#endif
		    }

k_module	: keyword_module
		    {
#ifndef RIPPER
			if (RTEST(ruby_verbose)) token_info_push(parser, "module");
#endif
		    }

k_def		: keyword_def
		    {
#ifndef RIPPER
			if (RTEST(ruby_verbose)) token_info_push(parser, "def");
#endif
		    }

k_end		: keyword_end
		    {
#ifndef RIPPER
			if (RTEST(ruby_verbose)) token_info_pop(parser, "end");  /* POP */
#endif
		    }

then		: term
		    /*%c%*/
		    /*%c
		    { $$ = Qnil; }
		    %*/
		| keyword_then
		| term keyword_then
		    /*%c%*/
		    /*%c
		    { $$ = $2; }
		    %*/
		;

do		: term
		    /*%c%*/
		    /*%c
		    { $$ = Qnil; }
		    %*/
		| keyword_do_cond
		;

if_tail		: opt_else
		| keyword_elsif expr_value then
		  compstmt
		  if_tail
		    {
		    /*%%%*/
			$$ = NEW_IF(cond($2), $4, $5);
			fixpos($$, $2);
		    /*%
			$$ = dispatch3(elsif, $2, $4, escape_Qundef($5));
		    %*/
		    }
		;

opt_else	: none
		| keyword_else compstmt
		    {
		    /*%%%*/
			$$ = $2;
		    /*%
			$$ = dispatch1(else, $2);
		    %*/
		    }
		;

for_var		: lhs
		| mlhs
		;

f_marg		: f_norm_arg
		    {
			$$ = assignable($1, 0);
		    /*%%%*/
		    /*%
			$$ = dispatch1(mlhs_paren, $$);
		    %*/
		    }
		| tLPAREN f_margs rparen
		    {
		    /*%%%*/
			$$ = $2;
		    /*%
			$$ = dispatch1(mlhs_paren, $2);
		    %*/
		    }
		;

f_marg_list	: f_marg
		    {
		    /*%%%*/
			$$ = NEW_LIST($1);
		    /*%
			$$ = mlhs_add(mlhs_new(), $1);
		    %*/
		    }
		| f_marg_list ',' f_marg
		    {
		    /*%%%*/
			$$ = list_append($1, $3);
		    /*%
			$$ = mlhs_add($1, $3);
		    %*/
		    }
		;

f_margs		: f_marg_list
		    {
		    /*%%%*/
			$$ = NEW_MASGN($1, 0);
		    /*%
			$$ = $1;
		    %*/
		    }
		| f_marg_list ',' tSTAR f_norm_arg
		    {
			$$ = assignable($4, 0);
		    /*%%%*/
			$$ = NEW_MASGN($1, $$);
		    /*%
			$$ = mlhs_add_star($1, $$);
		    %*/
		    }
		| f_marg_list ',' tSTAR f_norm_arg ',' f_marg_list
		    {
			$$ = assignable($4, 0);
		    /*%%%*/
			$$ = NEW_MASGN($1, NEW_POSTARG($$, $6));
		    /*%
			$$ = mlhs_add_star($1, $$);
		    %*/
		    }
		| f_marg_list ',' tSTAR
		    {
		    /*%%%*/
			$$ = NEW_MASGN($1, -1);
		    /*%
			$$ = mlhs_add_star($1, Qnil);
		    %*/
		    }
		| f_marg_list ',' tSTAR ',' f_marg_list
		    {
		    /*%%%*/
			$$ = NEW_MASGN($1, NEW_POSTARG(-1, $5));
		    /*%
			$$ = mlhs_add_star($1, $5);
		    %*/
		    }
		| tSTAR f_norm_arg
		    {
			$$ = assignable($2, 0);
		    /*%%%*/
			$$ = NEW_MASGN(0, $$);
		    /*%
			$$ = mlhs_add_star(mlhs_new(), $$);
		    %*/
		    }
		| tSTAR f_norm_arg ',' f_marg_list
		    {
			$$ = assignable($2, 0);
		    /*%%%*/
			$$ = NEW_MASGN(0, NEW_POSTARG($$, $4));
		    /*%
		      #if 0
		      TODO: Check me
		      #endif
			$$ = mlhs_add_star($$, $4);
		    %*/
		    }
		| tSTAR
		    {
		    /*%%%*/
			$$ = NEW_MASGN(0, -1);
		    /*%
			$$ = mlhs_add_star(mlhs_new(), Qnil);
		    %*/
		    }
		| tSTAR ',' f_marg_list
		    {
		    /*%%%*/
			$$ = NEW_MASGN(0, NEW_POSTARG(-1, $3));
		    /*%
			$$ = mlhs_add_star(mlhs_new(), Qnil);
		    %*/
		    }
		;

block_param	: f_arg ',' f_block_optarg ',' f_rest_arg opt_f_block_arg
		    {
		    /*%%%*/
			$$ = new_args($1, $3, $5, 0, $6);
		    /*%
			$$ = params_new($1, $3, $5, Qnil, escape_Qundef($6));
		    %*/
		    }
		| f_arg ',' f_block_optarg ',' f_rest_arg ',' f_arg opt_f_block_arg
		    {
		    /*%%%*/
			$$ = new_args($1, $3, $5, $7, $8);
		    /*%
			$$ = params_new($1, $3, $5, $7, escape_Qundef($8));
		    %*/
		    }
		| f_arg ',' f_block_optarg opt_f_block_arg
		    {
		    /*%%%*/
			$$ = new_args($1, $3, 0, 0, $4);
		    /*%
			$$ = params_new($1, $3, Qnil, Qnil, escape_Qundef($4));
		    %*/
		    }
		| f_arg ',' f_block_optarg ',' f_arg opt_f_block_arg
		    {
		    /*%%%*/
			$$ = new_args($1, $3, 0, $5, $6);
		    /*%
			$$ = params_new($1, $3, Qnil, $5, escape_Qundef($6));
		    %*/
		    }
                | f_arg ',' f_rest_arg opt_f_block_arg
		    {
		    /*%%%*/
			$$ = new_args($1, 0, $3, 0, $4);
		    /*%
			$$ = params_new($1, Qnil, $3, Qnil, escape_Qundef($4));
		    %*/
		    }
		| f_arg ','
		    {
		    /*%%%*/
			$$ = new_args($1, 0, 1, 0, 0);
		    /*%
			$$ = params_new($1, Qnil, Qnil, Qnil, Qnil);
                        dispatch1(excessed_comma, $$);
		    %*/
		    }
		| f_arg ',' f_rest_arg ',' f_arg opt_f_block_arg
		    {
		    /*%%%*/
			$$ = new_args($1, 0, $3, $5, $6);
		    /*%
			$$ = params_new($1, Qnil, $3, $5, escape_Qundef($6));
		    %*/
		    }
		| f_arg opt_f_block_arg
		    {
		    /*%%%*/
			$$ = new_args($1, 0, 0, 0, $2);
		    /*%
			$$ = params_new($1, Qnil,Qnil, Qnil, escape_Qundef($2));
		    %*/
		    }
		| f_block_optarg ',' f_rest_arg opt_f_block_arg
		    {
		    /*%%%*/
			$$ = new_args(0, $1, $3, 0, $4);
		    /*%
			$$ = params_new(Qnil, $1, $3, Qnil, escape_Qundef($4));
		    %*/
		    }
		| f_block_optarg ',' f_rest_arg ',' f_arg opt_f_block_arg
		    {
		    /*%%%*/
			$$ = new_args(0, $1, $3, $5, $6);
		    /*%
			$$ = params_new(Qnil, $1, $3, $5, escape_Qundef($6));
		    %*/
		    }
		| f_block_optarg opt_f_block_arg
		    {
		    /*%%%*/
			$$ = new_args(0, $1, 0, 0, $2);
		    /*%
			$$ = params_new(Qnil, $1, Qnil, Qnil,escape_Qundef($2));
		    %*/
		    }
		| f_block_optarg ',' f_arg opt_f_block_arg
		    {
		    /*%%%*/
			$$ = new_args(0, $1, 0, $3, $4);
		    /*%
			$$ = params_new(Qnil, $1, Qnil, $3, escape_Qundef($4));
		    %*/
		    }
		| f_rest_arg opt_f_block_arg
		    {
		    /*%%%*/
			$$ = new_args(0, 0, $1, 0, $2);
		    /*%
			$$ = params_new(Qnil, Qnil, $1, Qnil, escape_Qundef($2));
		    %*/
		    }
		| f_rest_arg ',' f_arg opt_f_block_arg
		    {
		    /*%%%*/
			$$ = new_args(0, 0, $1, $3, $4);
		    /*%
			$$ = params_new(Qnil, Qnil, $1, $3, escape_Qundef($4));
		    %*/
		    }
		| f_block_arg
		    {
		    /*%%%*/
			$$ = new_args(0, 0, 0, 0, $1);
		    /*%
			$$ = params_new(Qnil, Qnil, Qnil, Qnil, $1);
		    %*/
		    }
		;

opt_block_param	: none
		| block_param_def
		    {
			command_start = Qtrue;
		    }
		;

block_param_def	: '|' opt_bv_decl '|'
		    {
		    /*%%%*/
			$$ = 0;
		    /*%
			$$ = blockvar_new(params_new(Qnil,Qnil,Qnil,Qnil,Qnil),
                                          escape_Qundef($2));
		    %*/
		    }
		| tOROP
		    {
		    /*%%%*/
			$$ = 0;
		    /*%
			$$ = blockvar_new(params_new(Qnil,Qnil,Qnil,Qnil,Qnil),
                                          Qnil);
		    %*/
		    }
		| '|' block_param opt_bv_decl '|'
		    {
		    /*%%%*/
			$$ = $2;
		    /*%
			$$ = blockvar_new(escape_Qundef($2), escape_Qundef($3));
		    %*/
		    }
		;


opt_bv_decl	: none
		| ';' bv_decls
		    {
		    /*%%%*/
			$$ = 0;
		    /*%
			$$ = $2;
		    %*/
		    }
		;

bv_decls	: bvar
		    /*%c%*/
		    /*%c
		    {
			$$ = rb_ary_new3(1, $1);
		    }
		    %*/
		| bv_decls ',' bvar
		    /*%c%*/
		    /*%c
		    {
			rb_ary_push($$, $3);
		    }
		    %*/
		;

bvar		: tIDENTIFIER
		    {
			new_bv(get_id($1));
		    /*%%%*/
		    /*%
			$$ = get_value($1);
		    %*/
		    }
		| f_bad_arg
		    {
			$$ = 0;
		    }
		;

lambda		:   {
			$<vars>$ = dyna_push();
		    }
		    {
			$<num>$ = lpar_beg;
			lpar_beg = ++paren_nest;
		    }
		  f_larglist
		  lambda_body
		    {
			lpar_beg = $<num>2;
		    /*%%%*/
			$$ = $3;
			$$->nd_body = NEW_SCOPE($3->nd_head, $4);
		    /*%
			$$ = dispatch2(lambda, $3, $4);
		    %*/
			dyna_pop($<vars>1);
		    }
		;

f_larglist	: '(' f_args opt_bv_decl rparen
		    {
		    /*%%%*/
			$$ = NEW_LAMBDA($2);
		    /*%
			$$ = dispatch1(paren, $2);
		    %*/
		    }
		| f_args
		    {
		    /*%%%*/
			$$ = NEW_LAMBDA($1);
		    /*%
			$$ = $1;
		    %*/
		    }
		;

lambda_body	: tLAMBEG compstmt '}'
		    {
			$$ = $2;
		    }
		| keyword_do_LAMBDA compstmt keyword_end
		    {
			$$ = $2;
		    }
		;

do_block	: keyword_do_block
		    {
			$<vars>1 = dyna_push();
		    /*%%%*/
			$<num>$ = ruby_sourceline;
		    /*% %*/
		    }
		  opt_block_param
		  compstmt
		  keyword_end
		    {
		    /*%%%*/
			$$ = NEW_ITER($3,$4);
			nd_set_line($$, $<num>2);
		    /*%
			$$ = dispatch2(do_block, escape_Qundef($3), $4);
		    %*/
			dyna_pop($<vars>1);
		    }
		;

block_call	: command do_block
		    {
		    /*%%%*/
			if (nd_type($1) == NODE_YIELD) {
			    compile_error(PARSER_ARG "block given to yield");
			}
			else {
			    block_dup_check($1->nd_args, $2);
			}    
			$2->nd_iter = $1;
			$$ = $2;
			fixpos($$, $1);
		    /*%
			$$ = method_add_block($1, $2);
		    %*/
		    }
		| block_call '.' operation2 opt_paren_args
		    {
		    /*%%%*/
			$$ = NEW_CALL($1, $3, $4);
		    /*%
			$$ = dispatch3(call, $1, ripper_id2sym('.'), $3);
			$$ = method_optarg($$, $4);
		    %*/
		    }
		| block_call tCOLON2 operation2 opt_paren_args
		    {
		    /*%%%*/
			$$ = NEW_CALL($1, $3, $4);
		    /*%
			$$ = dispatch3(call, $1, ripper_intern("::"), $3);
			$$ = method_optarg($$, $4);
		    %*/
		    }
		;

method_call	: operation paren_args
		    {
		    /*%%%*/
			$$ = NEW_FCALL($1, $2);
			fixpos($$, $2);
		    /*%
			$$ = method_arg(dispatch1(fcall, $1), $2);
		    %*/
		    }
		| primary_value '.' operation2 opt_paren_args
		    {
		    /*%%%*/
			$$ = NEW_CALL($1, $3, $4);
			fixpos($$, $1);
		    /*%
			$$ = dispatch3(call, $1, ripper_id2sym('.'), $3);
			$$ = method_optarg($$, $4);
		    %*/
		    }
		| primary_value tCOLON2 operation2 paren_args
		    {
		    /*%%%*/
			$$ = NEW_CALL($1, $3, $4);
			fixpos($$, $1);
		    /*%
			$$ = dispatch3(call, $1, ripper_id2sym('.'), $3);
			$$ = method_optarg($$, $4);
		    %*/
		    }
		| primary_value tCOLON2 operation3
		    {
		    /*%%%*/
			$$ = NEW_CALL($1, $3, 0);
		    /*%
			$$ = dispatch3(call, $1, ripper_intern("::"), $3);
		    %*/
		    }
		| primary_value '.' paren_args
		    {
		    /*%%%*/
			$$ = NEW_CALL($1, rb_intern("call"), $3);
			fixpos($$, $1);
		    /*%
			$$ = dispatch3(call, $1, ripper_id2sym('.'),
				       ripper_intern("call"));
			$$ = method_optarg($$, $3);
		    %*/
		    }
		| primary_value tCOLON2 paren_args
		    {
		    /*%%%*/
			$$ = NEW_CALL($1, rb_intern("call"), $3);
			fixpos($$, $1);
		    /*%
			$$ = dispatch3(call, $1, ripper_intern("::"),
				       ripper_intern("call"));
			$$ = method_optarg($$, $3);
		    %*/
		    }
		| keyword_super paren_args
		    {
		    /*%%%*/
			$$ = NEW_SUPER($2);
		    /*%
			$$ = dispatch1(super, $2);
		    %*/
		    }
		| keyword_super
		    {
		    /*%%%*/
			$$ = NEW_ZSUPER();
		    /*%
			$$ = dispatch0(zsuper);
		    %*/
		    }
		| primary_value '[' opt_call_args rbracket
		    {
		    /*%%%*/
			if ($1 && nd_type($1) == NODE_SELF)
			    $$ = NEW_FCALL(tAREF, $3);
			else
			    $$ = NEW_CALL($1, tAREF, $3);
			fixpos($$, $1);
		    /*%
			$$ = dispatch2(aref, $1, escape_Qundef($3));
		    %*/
		    }
		;

brace_block	: '{'
		    {
			$<vars>1 = dyna_push();
		    /*%%%*/
			$<num>$ = ruby_sourceline;
		    /*%
                    %*/
		    }
		  opt_block_param
		  compstmt '}'
		    {
		    /*%%%*/
			$$ = NEW_ITER($3,$4);
			nd_set_line($$, $<num>2);
		    /*%
			$$ = dispatch2(brace_block, escape_Qundef($3), $4);
		    %*/
			dyna_pop($<vars>1);
		    }
		| keyword_do
		    {
			$<vars>1 = dyna_push();
		    /*%%%*/
			$<num>$ = ruby_sourceline;
		    /*%
                    %*/
		    }
		  opt_block_param
		  compstmt keyword_end
		    {
		    /*%%%*/
			$$ = NEW_ITER($3,$4);
			nd_set_line($$, $<num>2);
		    /*%
			$$ = dispatch2(do_block, escape_Qundef($3), $4);
		    %*/
			dyna_pop($<vars>1);
		    }
		;

case_body	: keyword_when args then
		  compstmt
		  cases
		    {
		    /*%%%*/
			$$ = NEW_WHEN($2, $4, $5);
		    /*%
			$$ = dispatch3(when, $2, $4, escape_Qundef($5));
		    %*/
		    }
		;

cases		: opt_else
		| case_body
		;

opt_rescue	: keyword_rescue exc_list exc_var then
		  compstmt
		  opt_rescue
		    {
		    /*%%%*/
			if ($3) {
			    $3 = node_assign($3, NEW_ERRINFO());
			    $5 = block_append($3, $5);
			}
			$$ = NEW_RESBODY($2, $5, $6);
			fixpos($$, $2?$2:$5);
		    /*%
			$$ = dispatch4(rescue,
				       escape_Qundef($2),
				       escape_Qundef($3),
				       escape_Qundef($5),
				       escape_Qundef($6));
		    %*/
		    }
		| none
		;

exc_list	: arg_value
		    {
		    /*%%%*/
			$$ = NEW_LIST($1);
		    /*%
			$$ = rb_ary_new3(1, $1);
		    %*/
		    }
		| mrhs
		    {
		    /*%%%*/
			if (!($$ = splat_array($1))) $$ = $1;
		    /*%
			$$ = $1;
		    %*/
		    }
		| none
		;

exc_var		: tASSOC lhs
		    {
			$$ = $2;
		    }
		| none
		;

opt_ensure	: keyword_ensure compstmt
		    {
		    /*%%%*/
			$$ = $2;
		    /*%
			$$ = dispatch1(ensure, $2);
		    %*/
		    }
		| none
		;

literal		: numeric
		| symbol
		    {
		    /*%%%*/
			$$ = NEW_LIT(ID2SYM($1));
		    /*%
			$$ = dispatch1(symbol_literal, $1);
		    %*/
		    }
		| dsym
		;

strings		: string
		    {
		    /*%%%*/
			NODE *node = $1;
			if (!node) {
			    node = NEW_STR(STR_NEW0());
			}
			else {
			    node = evstr2dstr(node);
			}
			$$ = node;
		    /*%
			$$ = $1;
		    %*/
		    }
		;

string		: tCHAR
		| string1
		| string string1
		    {
		    /*%%%*/
			$$ = literal_concat($1, $2);
		    /*%
			$$ = dispatch2(string_concat, $1, $2);
		    %*/
		    }
		;

string1		: tSTRING_BEG string_contents tSTRING_END
		    {
		    /*%%%*/
			$$ = $2;
		    /*%
			$$ = dispatch1(string_literal, $2);
		    %*/
		    }
		;

xstring		: tXSTRING_BEG xstring_contents tSTRING_END
		    {
		    /*%%%*/
			NODE *node = $2;
			if (!node) {
			    node = NEW_XSTR(STR_NEW0());
			}
			else {
			    switch (nd_type(node)) {
			      case NODE_STR:
				nd_set_type(node, NODE_XSTR);
				break;
			      case NODE_DSTR:
				nd_set_type(node, NODE_DXSTR);
				break;
			      default:
				node = NEW_NODE(NODE_DXSTR, STR_NEW0(), 1, NEW_LIST(node));
				break;
			    }
			}
			$$ = node;
		    /*%
			$$ = dispatch1(xstring_literal, $2);
		    %*/
		    }
		;

regexp		: tREGEXP_BEG xstring_contents tREGEXP_END
		    {
		    /*%%%*/
			int options = $3;
			NODE *node = $2;
                        NODE *list;
			if (!node) {
			    node = NEW_LIT(reg_compile(STR_NEW0(), options));
			}
			else switch (nd_type(node)) {
			  case NODE_STR:
			    {
				VALUE src = node->nd_lit;
				nd_set_type(node, NODE_LIT);
				node->nd_lit = reg_compile(src, options);
			    }
			    break;
			  default:
			    node = NEW_NODE(NODE_DSTR, STR_NEW0(), 1, NEW_LIST(node));
			  case NODE_DSTR:
			    if (options & RE_OPTION_ONCE) {
				nd_set_type(node, NODE_DREGX_ONCE);
			    }
			    else {
				nd_set_type(node, NODE_DREGX);
			    }
			    node->nd_cflag = options & RE_OPTION_MASK;
                            reg_fragment_check(node->nd_lit, options);
                            for (list = node->nd_next; list; list = list->nd_next) {
                                if (nd_type(list->nd_head) == NODE_STR) {
                                    reg_fragment_check(list->nd_head->nd_lit, options);
                                }
                            }
			    break;
			}
			$$ = node;
		    /*%
			$$ = dispatch2(regexp_literal, $2, $3);
		    %*/
		    }
		;

words		: tWORDS_BEG ' ' tSTRING_END
		    {
		    /*%%%*/
			$$ = NEW_ZARRAY();
		    /*%
			$$ = dispatch0(words_new);
		    %*/
		    }
		| tWORDS_BEG word_list tSTRING_END
		    {
			$$ = $2;
		    }
		;

word_list	: /* none */
		    {
		    /*%%%*/
			$$ = 0;
		    /*%
			$$ = dispatch0(words_new);
		    %*/
		    }
		| word_list word ' '
		    {
		    /*%%%*/
			$$ = list_append($1, evstr2dstr($2));
		    /*%
			$$ = dispatch2(words_add, $1, $2);
		    %*/
		    }
		;

word		: string_content
		    /*%c%*/
		    /*%c
		    {
			$$ = dispatch0(word_new);
			$$ = dispatch2(word_add, $$, $1);
		    }
		    %*/
		| word string_content
		    {
		    /*%%%*/
			$$ = literal_concat($1, $2);
		    /*%
			$$ = dispatch2(word_add, $1, $2);
		    %*/
		    }
		;

qwords		: tQWORDS_BEG ' ' tSTRING_END
		    {
		    /*%%%*/
			$$ = NEW_ZARRAY();
		    /*%
			$$ = dispatch0(qwords_new);
		    %*/
		    }
		| tQWORDS_BEG qword_list tSTRING_END
		    {
			$$ = $2;
		    }
		;

qword_list	: /* none */
		    {
		    /*%%%*/
			$$ = 0;
		    /*%
			$$ = dispatch0(qwords_new);
		    %*/
		    }
		| qword_list tSTRING_CONTENT ' '
		    {
		    /*%%%*/
			$$ = list_append($1, $2);
		    /*%
			$$ = dispatch2(qwords_add, $1, $2);
		    %*/
		    }
		;

string_contents : /* none */
		    {
		    /*%%%*/
			$$ = 0;
		    /*%
			$$ = dispatch0(string_content);
		    %*/
		    }
		| string_contents string_content
		    {
		    /*%%%*/
			$$ = literal_concat($1, $2);
		    /*%
			$$ = dispatch2(string_add, $1, $2);
		    %*/
		    }
		;

xstring_contents: /* none */
		    {
		    /*%%%*/
			$$ = 0;
		    /*%
			$$ = dispatch0(xstring_new);
		    %*/
		    }
		| xstring_contents string_content
		    {
		    /*%%%*/
			$$ = literal_concat($1, $2);
		    /*%
			$$ = dispatch2(xstring_add, $1, $2);
		    %*/
		    }
		;

string_content	: tSTRING_CONTENT
		| tSTRING_DVAR
		    {
			$<node>$ = lex_strterm;
			lex_strterm = 0;
			lex_state = EXPR_BEG;
		    }
		  string_dvar
		    {
		    /*%%%*/
			lex_strterm = $<node>2;
			$$ = NEW_EVSTR($3);
		    /*%
			lex_strterm = $<node>2;
			$$ = dispatch1(string_dvar, $3);
		    %*/
		    }
		| tSTRING_DBEG
		    {
			$<node>$ = lex_strterm;
			lex_strterm = 0;
			lex_state = EXPR_BEG;
			COND_PUSH(0);
			CMDARG_PUSH(0);
		    }
		  compstmt '}'
		    {
			lex_strterm = $<node>2;
			COND_LEXPOP();
			CMDARG_LEXPOP();
		    /*%%%*/
			if ($3) $3->flags &= ~NODE_FL_NEWLINE;
			$$ = new_evstr($3);
		    /*%
			$$ = dispatch1(string_embexpr, $3);
		    %*/
		    }
		;

string_dvar	: tGVAR
		    {
		    /*%%%*/
			$$ = NEW_GVAR($1);
		    /*%
			$$ = dispatch1(var_ref, $1);
		    %*/
		    }
		| tIVAR
		    {
		    /*%%%*/
			$$ = NEW_IVAR($1);
		    /*%
			$$ = dispatch1(var_ref, $1);
		    %*/
		    }
		| tCVAR
		    {
		    /*%%%*/
			$$ = NEW_CVAR($1);
		    /*%
			$$ = dispatch1(var_ref, $1);
		    %*/
		    }
		| backref
		;

symbol		: tSYMBEG sym
		    {
		    /*%%%*/
			lex_state = EXPR_END;
			$$ = $2;
		    /*%
			lex_state = EXPR_END;
			$$ = dispatch1(symbol, $2);
		    %*/
		    }
		;

sym		: fname
		| tIVAR
		| tGVAR
		| tCVAR
		;

dsym		: tSYMBEG xstring_contents tSTRING_END
		    {
		    /*%%%*/
			lex_state = EXPR_END;
			if (!($$ = $2)) {
			    $$ = NEW_LIT(ID2SYM(rb_intern("")));
			}
			else {
			    VALUE lit;

			    switch (nd_type($$)) {
			      case NODE_DSTR:
				nd_set_type($$, NODE_DSYM);
				break;
			      case NODE_STR:
				lit = $$->nd_lit;
				$$->nd_lit = ID2SYM(rb_intern_str(lit));
				nd_set_type($$, NODE_LIT);
				break;
			      default:
				$$ = NEW_NODE(NODE_DSYM, STR_NEW0(), 1, NEW_LIST($$));
				break;
			    }
			}
		    /*%
			lex_state = EXPR_END;
			$$ = dispatch1(dyna_symbol, $2);
		    %*/
		    }
		;

numeric 	: tINTEGER
		| tFLOAT
		| tUMINUS_NUM tINTEGER	       %prec tLOWEST
		    {
		    /*%%%*/
			$$ = negate_lit($2);
		    /*%
			$$ = dispatch2(unary, ripper_intern("-@"), $2);
		    %*/
		    }
		| tUMINUS_NUM tFLOAT	       %prec tLOWEST
		    {
		    /*%%%*/
			$$ = negate_lit($2);
		    /*%
			$$ = dispatch2(unary, ripper_intern("-@"), $2);
		    %*/
		    }
		;

variable	: tIDENTIFIER
		| tIVAR
		| tGVAR
		| tCONSTANT
		| tCVAR
		| keyword_nil {ifndef_ripper($$ = keyword_nil);}
		| keyword_self {ifndef_ripper($$ = keyword_self);}
		| keyword_true {ifndef_ripper($$ = keyword_true);}
		| keyword_false {ifndef_ripper($$ = keyword_false);}
		| keyword__FILE__ {ifndef_ripper($$ = keyword__FILE__);}
		| keyword__LINE__ {ifndef_ripper($$ = keyword__LINE__);}
		| keyword__ENCODING__ {ifndef_ripper($$ = keyword__ENCODING__);}
		;

var_ref		: variable
		    {
		    /*%%%*/
			if (!($$ = gettable($1))) $$ = NEW_BEGIN(0);
		    /*%
			$$ = dispatch1(var_ref, $1);
		    %*/
		    }
		;

var_lhs		: variable
		    {
			$$ = assignable($1, 0);
		    /*%%%*/
		    /*%
			$$ = dispatch1(var_field, $$);
		    %*/
		    }
		;

backref		: tNTH_REF
		| tBACK_REF
		;

superclass	: term
		    {
		    /*%%%*/
			$$ = 0;
		    /*%
			$$ = Qnil;
		    %*/
		    }
		| '<'
		    {
			lex_state = EXPR_BEG;
		    }
		  expr_value term
		    {
			$$ = $3;
		    }
		| error term
		    {
		    /*%%%*/
			yyerrok;
			$$ = 0;
		    /*%
			yyerrok;
			$$ = Qnil;
		    %*/
		    }
		;

f_arglist	: '(' f_args rparen
		    {
		    /*%%%*/
			$$ = $2;
			lex_state = EXPR_BEG;
			command_start = Qtrue;
		    /*%
			$$ = dispatch1(paren, $2);
			lex_state = EXPR_BEG;
			command_start = Qtrue;
		    %*/
		    }
		| f_args term
		    {
			$$ = $1;
		    }
		;

f_args		: f_arg ',' f_optarg ',' f_rest_arg opt_f_block_arg
		    {
		    /*%%%*/
			$$ = new_args($1, $3, $5, 0, $6);
		    /*%
			$$ = params_new($1, $3, $5, Qnil, escape_Qundef($6));
		    %*/
		    }
		| f_arg ',' f_optarg ',' f_rest_arg ',' f_arg opt_f_block_arg
		    {
		    /*%%%*/
			$$ = new_args($1, $3, $5, $7, $8);
		    /*%
			$$ = params_new($1, $3, $5, $7, escape_Qundef($8));
		    %*/
		    }
		| f_arg ',' f_optarg opt_f_block_arg
		    {
		    /*%%%*/
			$$ = new_args($1, $3, 0, 0, $4);
		    /*%
			$$ = params_new($1, $3, Qnil, Qnil, escape_Qundef($4));
		    %*/
		    }
		| f_arg ',' f_optarg ',' f_arg opt_f_block_arg
		    {
		    /*%%%*/
			$$ = new_args($1, $3, 0, $5, $6);
		    /*%
			$$ = params_new($1, $3, Qnil, $5, escape_Qundef($6));
		    %*/
		    }
		| f_arg ',' f_rest_arg opt_f_block_arg
		    {
		    /*%%%*/
			$$ = new_args($1, 0, $3, 0, $4);
		    /*%
			$$ = params_new($1, Qnil, $3, Qnil, escape_Qundef($4));
		    %*/
		    }
		| f_arg ',' f_rest_arg ',' f_arg opt_f_block_arg
		    {
		    /*%%%*/
			$$ = new_args($1, 0, $3, $5, $6);
		    /*%
			$$ = params_new($1, Qnil, $3, $5, escape_Qundef($6));
		    %*/
		    }
		| f_arg opt_f_block_arg
		    {
		    /*%%%*/
			$$ = new_args($1, 0, 0, 0, $2);
		    /*%
			$$ = params_new($1, Qnil, Qnil, Qnil,escape_Qundef($2));
		    %*/
		    }
		| f_optarg ',' f_rest_arg opt_f_block_arg
		    {
		    /*%%%*/
			$$ = new_args(0, $1, $3, 0, $4);
		    /*%
			$$ = params_new(Qnil, $1, $3, Qnil, escape_Qundef($4));
		    %*/
		    }
		| f_optarg ',' f_rest_arg ',' f_arg opt_f_block_arg
		    {
		    /*%%%*/
			$$ = new_args(0, $1, $3, $5, $6);
		    /*%
			$$ = params_new(Qnil, $1, $3, $5, escape_Qundef($6));
		    %*/
		    }
		| f_optarg opt_f_block_arg
		    {
		    /*%%%*/
			$$ = new_args(0, $1, 0, 0, $2);
		    /*%
			$$ = params_new(Qnil, $1, Qnil, Qnil,escape_Qundef($2));
		    %*/
		    }
		| f_optarg ',' f_arg opt_f_block_arg
		    {
		    /*%%%*/
			$$ = new_args(0, $1, 0, $3, $4);
		    /*%
			$$ = params_new(Qnil, $1, Qnil, $3, escape_Qundef($4));
		    %*/
		    }
		| f_rest_arg opt_f_block_arg
		    {
		    /*%%%*/
			$$ = new_args(0, 0, $1, 0, $2);
		    /*%
			$$ = params_new(Qnil, Qnil, $1, Qnil,escape_Qundef($2));
		    %*/
		    }
		| f_rest_arg ',' f_arg opt_f_block_arg
		    {
		    /*%%%*/
			$$ = new_args(0, 0, $1, $3, $4);
		    /*%
			$$ = params_new(Qnil, Qnil, $1, $3, escape_Qundef($4));
		    %*/
		    }
		| f_block_arg
		    {
		    /*%%%*/
			$$ = new_args(0, 0, 0, 0, $1);
		    /*%
			$$ = params_new(Qnil, Qnil, Qnil, Qnil, $1);
		    %*/
		    }
		| /* none */
		    {
		    /*%%%*/
			$$ = new_args(0, 0, 0, 0, 0);
		    /*%
			$$ = params_new(Qnil, Qnil, Qnil, Qnil, Qnil);
		    %*/
		    }
		;

f_bad_arg	: tCONSTANT
		    {
		    /*%%%*/
			yyerror("formal argument cannot be a constant");
			$$ = 0;
		    /*%
			$$ = dispatch1(param_error, $1);
		    %*/
		    }
		| tIVAR
		    {
		    /*%%%*/
			yyerror("formal argument cannot be an instance variable");
			$$ = 0;
		    /*%
			$$ = dispatch1(param_error, $1);
		    %*/
		    }
		| tGVAR
		    {
		    /*%%%*/
			yyerror("formal argument cannot be a global variable");
			$$ = 0;
		    /*%
			$$ = dispatch1(param_error, $1);
		    %*/
		    }
		| tCVAR
		    {
		    /*%%%*/
			yyerror("formal argument cannot be a class variable");
			$$ = 0;
		    /*%
			$$ = dispatch1(param_error, $1);
		    %*/
		    }
		;

f_norm_arg	: f_bad_arg
		| tIDENTIFIER
		    {
			formal_argument(get_id($1));
			$$ = $1;
		    }
		;

f_arg_item	: f_norm_arg
		    {
			arg_var(get_id($1));
		    /*%%%*/
			$$ = NEW_ARGS_AUX($1, 1);
		    /*%
			$$ = get_value($1);
		    %*/
		    }
		| tLPAREN f_margs rparen
		    {
			ID tid = internal_id();
			arg_var(tid);
		    /*%%%*/
			if (dyna_in_block()) {
			    $2->nd_value = NEW_DVAR(tid);
			}
			else {
			    $2->nd_value = NEW_LVAR(tid);
			}
			$$ = NEW_ARGS_AUX(tid, 1);
			$$->nd_next = $2;
		    /*%
			$$ = dispatch1(mlhs_paren, $2);
		    %*/
		    }
		;

f_arg		: f_arg_item
		    /*%c%*/
		    /*%c
		    {
			$$ = rb_ary_new3(1, $1);
		    }
		    c%*/
		| f_arg ',' f_arg_item
		    {
		    /*%%%*/
			$$ = $1;
			$$->nd_plen++;
			$$->nd_next = block_append($$->nd_next, $3->nd_next);
			rb_gc_force_recycle((VALUE)$3);
		    /*%
			$$ = rb_ary_push($1, $3);
		    %*/
		    }
		;

f_opt		: tIDENTIFIER '=' arg_value
		    {
			arg_var(formal_argument(get_id($1)));
			$$ = assignable($1, $3);
		    /*%%%*/
			$$ = NEW_OPT_ARG(0, $$);
		    /*%
			$$ = rb_assoc_new($$, $3);
		    %*/
		    }
		;

f_block_opt	: tIDENTIFIER '=' primary_value
		    {
			arg_var(formal_argument(get_id($1)));
			$$ = assignable($1, $3);
		    /*%%%*/
			$$ = NEW_OPT_ARG(0, $$);
		    /*%
			$$ = rb_assoc_new($$, $3);
		    %*/
		    }
		;

f_block_optarg	: f_block_opt
		    {
		    /*%%%*/
			$$ = $1;
		    /*%
			$$ = rb_ary_new3(1, $1);
		    %*/
		    }
		| f_block_optarg ',' f_block_opt
		    {
		    /*%%%*/
			NODE *opts = $1;

			while (opts->nd_next) {
			    opts = opts->nd_next;
			}
			opts->nd_next = $3;
			$$ = $1;
		    /*%
			$$ = rb_ary_push($1, $3);
		    %*/
		    }
		;

f_optarg	: f_opt
		    {
		    /*%%%*/
			$$ = $1;
		    /*%
			$$ = rb_ary_new3(1, $1);
		    %*/
		    }
		| f_optarg ',' f_opt
		    {
		    /*%%%*/
			NODE *opts = $1;

			while (opts->nd_next) {
			    opts = opts->nd_next;
			}
			opts->nd_next = $3;
			$$ = $1;
		    /*%
			$$ = rb_ary_push($1, $3);
		    %*/
		    }
		;

restarg_mark	: '*'
		| tSTAR
		;

f_rest_arg	: restarg_mark tIDENTIFIER
		    {
		    /*%%%*/
			if (!is_local_id($2))
			    yyerror("rest argument must be local variable");
		    /*% %*/
			arg_var(shadowing_lvar(get_id($2)));
		    /*%%%*/
			$$ = $2;
		    /*%
			$$ = dispatch1(rest_param, $2);
		    %*/
		    }
		| restarg_mark
		    {
		    /*%%%*/
			$$ = internal_id();
			arg_var($$);
		    /*%
			$$ = dispatch1(rest_param, Qnil);
		    %*/
		    }
		;

blkarg_mark	: '&'
		| tAMPER
		;

f_block_arg	: blkarg_mark tIDENTIFIER
		    {
		    /*%%%*/
			if (!is_local_id($2))
			    yyerror("block argument must be local variable");
			else if (!dyna_in_block() && local_id($2))
			    yyerror("duplicated block argument name");
		    /*% %*/
			arg_var(shadowing_lvar(get_id($2)));
		    /*%%%*/
			$$ = $2;
		    /*%
			$$ = dispatch1(blockarg, $2);
		    %*/
		    }
		;

opt_f_block_arg	: ',' f_block_arg
		    {
			$$ = $2;
		    }
		| none
		    {
		    /*%%%*/
			$$ = 0;
		    /*%
			$$ = Qundef;
		    %*/
		    }
		;

singleton	: var_ref
		    {
		    /*%%%*/
			value_expr($1);
			$$ = $1;
		        if (!$$) $$ = NEW_NIL();
		    /*%
			$$ = $1;
		    %*/
		    }
		| '(' {lex_state = EXPR_BEG;} expr rparen
		    {
		    /*%%%*/
			if ($3 == 0) {
			    yyerror("can't define singleton method for ().");
			}
			else {
			    switch (nd_type($3)) {
			      case NODE_STR:
			      case NODE_DSTR:
			      case NODE_XSTR:
			      case NODE_DXSTR:
			      case NODE_DREGX:
			      case NODE_LIT:
			      case NODE_ARRAY:
			      case NODE_ZARRAY:
				yyerror("can't define singleton method for literals");
			      default:
				value_expr($3);
				break;
			    }
			}
			$$ = $3;
		    /*%
			$$ = dispatch1(paren, $3);
		    %*/
		    }
		;

assoc_list	: none
		| assocs trailer
		    {
		    /*%%%*/
			$$ = $1;
		    /*%
			$$ = dispatch1(assoclist_from_args, $1);
		    %*/
		    }
		;

assocs		: assoc
		    /*%c%*/
		    /*%c
		    {
			$$ = rb_ary_new3(1, $1);
		    }
		    %*/
		| assocs ',' assoc
		    {
		    /*%%%*/
			$$ = list_concat($1, $3);
		    /*%
			$$ = rb_ary_push($1, $3);
		    %*/
		    }
		;

assoc		: arg_value tASSOC arg_value
		    {
		    /*%%%*/
			$$ = list_append(NEW_LIST($1), $3);
		    /*%
			$$ = dispatch2(assoc_new, $1, $3);
		    %*/
		    }
		| tLABEL arg_value
		    {
		    /*%%%*/
			$$ = list_append(NEW_LIST(NEW_LIT(ID2SYM($1))), $2);
		    /*%
			$$ = dispatch2(assoc_new, $1, $2);
		    %*/
		    }
		;

operation	: tIDENTIFIER
		| tCONSTANT
		| tFID
		;

operation2	: tIDENTIFIER
		| tCONSTANT
		| tFID
		| op
		;

operation3	: tIDENTIFIER
		| tFID
		| op
		;

dot_or_colon	: '.'
		    /*%c%*/
		    /*%c
		    { $$ = $<val>1; }
		    %*/
		| tCOLON2
		    /*%c%*/
		    /*%c
		    { $$ = $<val>1; }
		    %*/
		;

opt_terms	: /* none */
		| terms
		;

opt_nl		: /* none */
		| '\n'
		;

rparen		: opt_nl ')'
		;

rbracket	: opt_nl ']'
		;

trailer		: /* none */
		| '\n'
		| ','
		;

term		: ';' {yyerrok;}
		| '\n'
		;

terms		: term
		| terms ';' {yyerrok;}
		;

none		: /* none */
		    {
		    /*%%%*/
			$$ = 0;
		    /*%
			$$ = Qundef;
		    %*/
		    }
		;
%%
# undef parser
# undef yylex
# undef yylval
# define yylval  (*((YYSTYPE*)(parser->parser_yylval)))

static int parser_regx_options(struct parser_params*);
static int parser_tokadd_string(struct parser_params*,int,int,int,long*,rb_encoding**);
static void parser_tokaddmbc(struct parser_params *parser, int c, rb_encoding *enc);
static int parser_parse_string(struct parser_params*,NODE*);
static int parser_here_document(struct parser_params*,NODE*);


# define nextc()                   parser_nextc(parser)
# define pushback(c)               parser_pushback(parser, c)
# define newtok()                  parser_newtok(parser)
# define tokspace(n)               parser_tokspace(parser, n)
# define tokadd(c)                 parser_tokadd(parser, c)
# define tok_hex(numlen)           parser_tok_hex(parser, numlen)
# define read_escape(flags,e)      parser_read_escape(parser, flags, e)
# define tokadd_escape(e)          parser_tokadd_escape(parser, e)
# define regx_options()            parser_regx_options(parser)
# define tokadd_string(f,t,p,n,e)  parser_tokadd_string(parser,f,t,p,n,e)
# define parse_string(n)           parser_parse_string(parser,n)
# define tokaddmbc(c, enc)         parser_tokaddmbc(parser, c, enc)
# define here_document(n)          parser_here_document(parser,n)
# define heredoc_identifier()      parser_heredoc_identifier(parser)
# define heredoc_restore(n)        parser_heredoc_restore(parser,n)
# define whole_match_p(e,l,i)      parser_whole_match_p(parser,e,l,i)

#ifndef RIPPER
# define set_yylval_str(x) yylval.node = NEW_STR(x)
# define set_yylval_num(x) yylval.num = x
# define set_yylval_id(x)  yylval.id = x
# define set_yylval_name(x)  yylval.id = x
# define set_yylval_literal(x) yylval.node = NEW_LIT(x)
# define set_yylval_node(x) yylval.node = x
# define yylval_id() yylval.id
#else
static inline VALUE
ripper_yylval_id(ID x)
{
    return (VALUE)NEW_LASGN(x, ID2SYM(x));
}
# define set_yylval_str(x) (void)(x)
# define set_yylval_num(x) (void)(x)
# define set_yylval_id(x)  (void)(x)
# define set_yylval_name(x) (void)(yylval.val = ripper_yylval_id(x))
# define set_yylval_literal(x) (void)(x)
# define set_yylval_node(x) (void)(x)
# define yylval_id() yylval.id
#endif

#ifndef RIPPER
#define ripper_flush(p) (void)(p)
#else
#define ripper_flush(p) (p->tokp = p->parser_lex_p)

#define yylval_rval *(TYPE(yylval.val) == T_NODE ? &yylval.node->nd_rval : &yylval.val)

static int
ripper_has_scan_event(struct parser_params *parser)
{

    if (lex_p < parser->tokp) rb_raise(rb_eRuntimeError, "lex_p < tokp");
    return lex_p > parser->tokp;
}

static VALUE
ripper_scan_event_val(struct parser_params *parser, int t)
{
    VALUE str = STR_NEW(parser->tokp, lex_p - parser->tokp);
    VALUE rval = ripper_dispatch1(parser, ripper_token2eventid(t), str);
    ripper_flush(parser);
    return rval;
}

static void
ripper_dispatch_scan_event(struct parser_params *parser, int t)
{
    if (!ripper_has_scan_event(parser)) return;
    yylval_rval = ripper_scan_event_val(parser, t);
}

static void
ripper_dispatch_ignored_scan_event(struct parser_params *parser, int t)
{
    if (!ripper_has_scan_event(parser)) return;
    (void)ripper_scan_event_val(parser, t);
}

static void
ripper_dispatch_delayed_token(struct parser_params *parser, int t)
{
    int saved_line = ruby_sourceline;
    const char *saved_tokp = parser->tokp;

    ruby_sourceline = parser->delayed_line;
    parser->tokp = lex_pbeg + parser->delayed_col;
    yylval_rval = ripper_dispatch1(parser, ripper_token2eventid(t), parser->delayed);
    parser->delayed = Qnil;
    ruby_sourceline = saved_line;
    parser->tokp = saved_tokp;
}
#endif /* RIPPER */

#include "ruby/regex.h"
#include "ruby/util.h"

/* We remove any previous definition of `SIGN_EXTEND_CHAR',
   since ours (we hope) works properly with all combinations of
   machines, compilers, `char' and `unsigned char' argument types.
   (Per Bothner suggested the basic approach.)  */
#undef SIGN_EXTEND_CHAR
#if __STDC__
# define SIGN_EXTEND_CHAR(c) ((signed char)(c))
#else  /* not __STDC__ */
/* As in Harbison and Steele.  */
# define SIGN_EXTEND_CHAR(c) ((((unsigned char)(c)) ^ 128) - 128)
#endif

#define parser_encoding_name()  (parser->enc->name)
#define parser_mbclen()  mbclen((lex_p-1),lex_pend,parser->enc)
#define parser_precise_mbclen()  rb_enc_precise_mbclen((lex_p-1),lex_pend,parser->enc)
#define is_identchar(p,e,enc) (rb_enc_isalnum(*p,enc) || (*p) == '_' || !ISASCII(*p))
#define parser_is_identchar() (!parser->eofp && is_identchar((lex_p-1),lex_pend,parser->enc))

#define parser_isascii() ISASCII(*(lex_p-1))

#ifndef RIPPER
static int
token_info_get_column(struct parser_params *parser, const char *token)
{
    int column = 1;
    const char *p, *pend = lex_p - strlen(token);
    for (p = lex_pbeg; p < pend; p++) {
	if (*p == '\t') {
	    column = (((column - 1) / 8) + 1) * 8;
	}
	column++;
    }
    return column;
}

static int
token_info_has_nonspaces(struct parser_params *parser, const char *token)
{
    const char *p, *pend = lex_p - strlen(token);
    for (p = lex_pbeg; p < pend; p++) {
	if (*p != ' ' && *p != '\t') {
	    return 1;
	}
    }
    return 0;
}

static void
token_info_push(struct parser_params *parser, const char *token)
{
    token_info *ptinfo;

    if (compile_for_eval) return;
    ptinfo = ALLOC(token_info);
    ptinfo->token = token;
    ptinfo->linenum = ruby_sourceline;
    ptinfo->column = token_info_get_column(parser, token);
    ptinfo->nonspc = token_info_has_nonspaces(parser, token);
    ptinfo->next = parser->parser_token_info;

    parser->parser_token_info = ptinfo;
}

static void
token_info_pop(struct parser_params *parser, const char *token)
{
    int linenum;
    token_info *ptinfo = parser->parser_token_info;

    if (!ptinfo) return;
    parser->parser_token_info = ptinfo->next;
    if (token_info_get_column(parser, token) == ptinfo->column) { /* OK */
	goto finish;
    }
    linenum = ruby_sourceline;
    if (linenum == ptinfo->linenum) { /* SKIP */
	goto finish;
    }
    if (token_info_has_nonspaces(parser, token) || ptinfo->nonspc) { /* SKIP */
	goto finish;
    }
    rb_compile_warning(ruby_sourcefile, linenum,
               "mismatched indentations at '%s' with '%s' at %d",
	       token, ptinfo->token, ptinfo->linenum);

  finish:
    xfree(ptinfo);
}
#endif	/* RIPPER */

static int
parser_yyerror(struct parser_params *parser, const char *msg)
{
#ifndef RIPPER
    const int max_line_margin = 30;
    const char *p, *pe;
    char *buf;
    int len, i;

    compile_error(PARSER_ARG "%s", msg);
    p = lex_p;
    while (lex_pbeg <= p) {
	if (*p == '\n') break;
	p--;
    }
    p++;

    pe = lex_p;
    while (pe < lex_pend) {
	if (*pe == '\n') break;
	pe++;
    }

    len = pe - p;
    if (len > 4) {
	char *p2;
	const char *pre = "", *post = "";

	if (len > max_line_margin * 2 + 10) {
	    if (lex_p - p > max_line_margin) {
		p = rb_enc_prev_char(p, lex_p - max_line_margin, pe, rb_enc_get(lex_lastline));
		pre = "...";
	    }
	    if (pe - lex_p > max_line_margin) {
		pe = rb_enc_prev_char(lex_p, lex_p + max_line_margin, pe, rb_enc_get(lex_lastline));
		post = "...";
	    }
	    len = pe - p;
	}
	buf = ALLOCA_N(char, len+2);
	MEMCPY(buf, p, char, len);
	buf[len] = '\0';
	rb_compile_error_append("%s%s%s", pre, buf, post);

	i = lex_p - p;
	p2 = buf; pe = buf + len;

	while (p2 < pe) {
	    if (*p2 != '\t') *p2 = ' ';
	    p2++;
	}
	buf[i] = '^';
	buf[i+1] = '\0';
	rb_compile_error_append("%s%s", pre, buf);
    }
#else
    dispatch1(parse_error, STR_NEW2(msg));
#endif /* !RIPPER */
    return 0;
}

static void parser_prepare(struct parser_params *parser);

#ifndef RIPPER
VALUE ruby_suppress_tracing(VALUE (*func)(VALUE, int), VALUE arg, int always);

static VALUE
debug_lines(const char *f)
{
    if (rb_const_defined_at(rb_cObject, rb_intern("SCRIPT_LINES__"))) {
	VALUE hash = rb_const_get_at(rb_cObject, rb_intern("SCRIPT_LINES__"));
	if (TYPE(hash) == T_HASH) {
	    VALUE fname = rb_str_new2(f);
	    VALUE lines = rb_ary_new();
	    rb_hash_aset(hash, fname, lines);
	    return lines;
	}
    }
    return 0;
}

static VALUE
coverage(const char *f, int n)
{
    extern VALUE rb_get_coverages(void);
    VALUE coverages = rb_get_coverages();
    if (RTEST(coverages) && RBASIC(coverages)->klass == 0) {
	VALUE fname = rb_str_new2(f);
	VALUE lines = rb_ary_new2(n);
	int i;
	RBASIC(lines)->klass = 0;
	for (i = 0; i < n; i++) RARRAY_PTR(lines)[i] = Qnil;
	RARRAY(lines)->as.heap.len = n;
	rb_hash_aset(coverages, fname, lines);
	return lines;
    }
    return 0;
}

static int
e_option_supplied(struct parser_params *parser)
{
    if (strcmp(ruby_sourcefile, "-e") == 0)
	return Qtrue;
    return Qfalse;
}

static VALUE
yycompile0(VALUE arg, int tracing)
{
    int n;
    NODE *tree;
    struct parser_params *parser = (struct parser_params *)arg;

    if (!compile_for_eval && rb_safe_level() == 0) {
	ruby_debug_lines = debug_lines(ruby_sourcefile);
	if (ruby_debug_lines && ruby_sourceline > 0) {
	    VALUE str = STR_NEW0();
	    n = ruby_sourceline;
	    do {
		rb_ary_push(ruby_debug_lines, str);
	    } while (--n);
	}

	if (!e_option_supplied(parser)) {
	    ruby_coverage = coverage(ruby_sourcefile, ruby_sourceline);
	}
    }

    parser_prepare(parser);
    deferred_nodes = 0;
    n = yyparse((void*)parser);
    ruby_debug_lines = 0;
    ruby_coverage = 0;
    compile_for_eval = 0;

    lex_strterm = 0;
    lex_p = lex_pbeg = lex_pend = 0;
    lex_lastline = lex_nextline = 0;
    if (parser->nerr) {
	return 0;
    }
    tree = ruby_eval_tree;
    if (!tree) {
	tree = NEW_NIL();
    }
    if (ruby_eval_tree_begin) {
	NODE *scope = ruby_eval_tree;

        if (scope) {
	    scope->nd_body = NEW_PRELUDE(ruby_eval_tree_begin, scope->nd_body);
	}
	tree = scope;
    }
    else {
	tree = ruby_eval_tree;
    }
    return (VALUE)tree;
}

static NODE*
yycompile(struct parser_params *parser, const char *f, int line)
{
    ruby_sourcefile = ruby_strdup(f);
    ruby_sourceline = line - 1;
    return (NODE *)ruby_suppress_tracing(yycompile0, (VALUE)parser, Qtrue);
}
#endif /* !RIPPER */

static rb_encoding *
must_be_ascii_compatible(VALUE s)
{
    rb_encoding *enc = rb_enc_get(s);
    if (!rb_enc_asciicompat(enc)) {
	rb_raise(rb_eArgError, "invalid source encoding");
    }
    return enc;
}

static VALUE
lex_get_str(struct parser_params *parser, VALUE s)
{
    char *beg, *end, *pend;
    rb_encoding *enc = must_be_ascii_compatible(s);

    beg = RSTRING_PTR(s);
    if (lex_gets_ptr) {
	if (RSTRING_LEN(s) == lex_gets_ptr) return Qnil;
	beg += lex_gets_ptr;
    }
    pend = RSTRING_PTR(s) + RSTRING_LEN(s);
    end = beg;
    while (end < pend) {
	if (*end++ == '\n') break;
    }
    lex_gets_ptr = end - RSTRING_PTR(s);
    return rb_enc_str_new(beg, end - beg, enc);
}

static VALUE
lex_getline(struct parser_params *parser)
{
    VALUE line = (*parser->parser_lex_gets)(parser, parser->parser_lex_input);
    if (NIL_P(line)) return line;
    must_be_ascii_compatible(line);
#ifndef RIPPER
    if (ruby_debug_lines) {
	rb_ary_push(ruby_debug_lines, line);
    }
    if (ruby_coverage) {
	rb_ary_push(ruby_coverage, Qnil);
    }
#endif
    return line;
}

#ifndef RIPPER
static NODE*
parser_compile_string(volatile VALUE vparser, const char *f, VALUE s, int line)
{
    struct parser_params *parser;
    NODE *node;
    volatile VALUE tmp;

    Data_Get_Struct(vparser, struct parser_params, parser);
    lex_gets = lex_get_str;
    lex_gets_ptr = 0;
    lex_input = s;
    lex_pbeg = lex_p = lex_pend = 0;
    compile_for_eval = rb_parse_in_eval();

    node = yycompile(parser, f, line);
    tmp = vparser; /* prohibit tail call optimization */

    return node;
}

NODE*
rb_compile_string(const char *f, VALUE s, int line)
{
    must_be_ascii_compatible(s);
    return parser_compile_string(rb_parser_new(), f, s, line);
}

NODE*
rb_parser_compile_string(volatile VALUE vparser, const char *f, VALUE s, int line)
{
    must_be_ascii_compatible(s);
    return parser_compile_string(vparser, f, s, line);
}

NODE*
rb_compile_cstr(const char *f, const char *s, int len, int line)
{
    VALUE str = rb_str_new(s, len);
    return parser_compile_string(rb_parser_new(), f, str, line);
}

NODE*
rb_parser_compile_cstr(volatile VALUE vparser, const char *f, const char *s, int len, int line)
{
    VALUE str = rb_str_new(s, len);
    return parser_compile_string(vparser, f, str, line);
}

static VALUE
lex_io_gets(struct parser_params *parser, VALUE io)
{
    return rb_io_gets(io);
}

NODE*
rb_compile_file(const char *f, VALUE file, int start)
{
    VALUE volatile vparser = rb_parser_new();

    return rb_parser_compile_file(vparser, f, file, start);
}

NODE*
rb_parser_compile_file(volatile VALUE vparser, const char *f, VALUE file, int start)
{
    struct parser_params *parser;
    volatile VALUE tmp;
    NODE *node;

    Data_Get_Struct(vparser, struct parser_params, parser);
    lex_gets = lex_io_gets;
    lex_input = file;
    lex_pbeg = lex_p = lex_pend = 0;
    compile_for_eval = rb_parse_in_eval();

    node = yycompile(parser, f, start);
    tmp = vparser; /* prohibit tail call optimization */

    return node;
}
#endif  /* !RIPPER */

#define STR_FUNC_ESCAPE 0x01
#define STR_FUNC_EXPAND 0x02
#define STR_FUNC_REGEXP 0x04
#define STR_FUNC_QWORDS 0x08
#define STR_FUNC_SYMBOL 0x10
#define STR_FUNC_INDENT 0x20

enum string_type {
    str_squote = (0),
    str_dquote = (STR_FUNC_EXPAND),
    str_xquote = (STR_FUNC_EXPAND),
    str_regexp = (STR_FUNC_REGEXP|STR_FUNC_ESCAPE|STR_FUNC_EXPAND),
    str_sword  = (STR_FUNC_QWORDS),
    str_dword  = (STR_FUNC_QWORDS|STR_FUNC_EXPAND),
    str_ssym   = (STR_FUNC_SYMBOL),
    str_dsym   = (STR_FUNC_SYMBOL|STR_FUNC_EXPAND)
};

static VALUE
parser_str_new(const char *p, long n, rb_encoding *enc, int func, rb_encoding *enc0)
{
    VALUE str;

    str = rb_enc_str_new(p, n, enc);
    if (!(func & STR_FUNC_REGEXP) && rb_enc_asciicompat(enc)) {
	if (rb_enc_str_coderange(str) == ENC_CODERANGE_7BIT) {
	}
	else if (enc0 == rb_usascii_encoding() && enc != rb_utf8_encoding()) {
	    rb_enc_associate(str, rb_ascii8bit_encoding());
	}
    }

    return str;
}

#define lex_goto_eol(parser) (parser->parser_lex_p = parser->parser_lex_pend)
#define peek(c) (lex_p < lex_pend && (c) == *lex_p)

static inline int
parser_nextc(struct parser_params *parser)
{
    int c;

    if (lex_p == lex_pend) {
	VALUE v = lex_nextline;
	lex_nextline = 0;
	if (!v) {
	    if (parser->eofp)
		return -1;

	    if (!lex_input || NIL_P(v = lex_getline(parser))) {
		parser->eofp = Qtrue;
		lex_goto_eol(parser);
		return -1;
	    }
	}
	{
#ifdef RIPPER
	    if (parser->tokp < lex_pend) {
		if (NIL_P(parser->delayed)) {
		    parser->delayed = rb_str_buf_new(1024);
		    rb_str_buf_cat(parser->delayed,
				   parser->tokp, lex_pend - parser->tokp);
		    parser->delayed_line = ruby_sourceline;
		    parser->delayed_col = parser->tokp - lex_pbeg;
		}
		else {
		    rb_str_buf_cat(parser->delayed,
				   parser->tokp, lex_pend - parser->tokp);
		}
	    }
#endif
	    if (heredoc_end > 0) {
		ruby_sourceline = heredoc_end;
		heredoc_end = 0;
	    }
	    ruby_sourceline++;
	    parser->line_count++;
	    lex_pbeg = lex_p = RSTRING_PTR(v);
	    lex_pend = lex_p + RSTRING_LEN(v);
	    ripper_flush(parser);
	    lex_lastline = v;
	}
    }
    c = (unsigned char)*lex_p++;
    if (c == '\r' && peek('\n')) {
	lex_p++;
	c = '\n';
    }

    return c;
}

static void
parser_pushback(struct parser_params *parser, int c)
{
    if (c == -1) return;
    lex_p--;
    if (lex_p > lex_pbeg && lex_p[0] == '\n' && lex_p[-1] == '\r') {
	lex_p--;
    }
}

#define was_bol() (lex_p == lex_pbeg + 1)

#define tokfix() (tokenbuf[tokidx]='\0')
#define tok() tokenbuf
#define toklen() tokidx
#define toklast() (tokidx>0?tokenbuf[tokidx-1]:0)

static char*
parser_newtok(struct parser_params *parser)
{
    tokidx = 0;
    if (!tokenbuf) {
	toksiz = 60;
	tokenbuf = ALLOC_N(char, 60);
    }
    if (toksiz > 4096) {
	toksiz = 60;
	REALLOC_N(tokenbuf, char, 60);
    }
    return tokenbuf;
}

static char *
parser_tokspace(struct parser_params *parser, int n)
{
    tokidx += n;

    if (tokidx >= toksiz) {
	do {toksiz *= 2;} while (toksiz < tokidx);
	REALLOC_N(tokenbuf, char, toksiz);
    }
    return &tokenbuf[tokidx-n];
}

static void
parser_tokadd(struct parser_params *parser, int c)
{
    tokenbuf[tokidx++] = (char)c;
    if (tokidx >= toksiz) {
	toksiz *= 2;
	REALLOC_N(tokenbuf, char, toksiz);
    }
}

static int
parser_tok_hex(struct parser_params *parser, int *numlen)
{
    int c;

    c = scan_hex(lex_p, 2, numlen);
    if (!*numlen) {
	yyerror("invalid hex escape");
	return 0;
    }
    lex_p += *numlen;
    return c;
}

#define tokcopy(n) memcpy(tokspace(n), lex_p - (n), (n))

static int
parser_tokadd_utf8(struct parser_params *parser, rb_encoding **encp,
                   int string_literal, int symbol_literal, int regexp_literal)
{
    /*
     * If string_literal is true, then we allow multiple codepoints
     * in \u{}, and add the codepoints to the current token.
     * Otherwise we're parsing a character literal and return a single
     * codepoint without adding it
     */

    int codepoint;
    int numlen;

    if (regexp_literal) { tokadd('\\'); tokadd('u'); }

    if (peek('{')) {  /* handle \u{...} form */
	do {
            if (regexp_literal) { tokadd(*lex_p); }
	    nextc();
	    codepoint = scan_hex(lex_p, 6, &numlen);
	    if (numlen == 0)  {
		yyerror("invalid Unicode escape");
		return 0;
	    }
	    if (codepoint > 0x10ffff) {
		yyerror("invalid Unicode codepoint (too large)");
		return 0;
	    }
	    lex_p += numlen;
            if (regexp_literal) {
                tokcopy(numlen);
            }
            else if (codepoint >= 0x80) {
		*encp = UTF8_ENC();
		if (string_literal) tokaddmbc(codepoint, *encp);
	    }
	    else if (string_literal) {
		if (codepoint == 0 && symbol_literal) {
		    yyerror("symbol cannot contain '\\u{0}'");
		    return 0;
		}

		tokadd(codepoint);
	    }
	} while (string_literal && (peek(' ') || peek('\t')));

	if (!peek('}')) {
	    yyerror("unterminated Unicode escape");
	    return 0;
	}

        if (regexp_literal) { tokadd('}'); }
	nextc();
    }
    else {			/* handle \uxxxx form */
	codepoint = scan_hex(lex_p, 4, &numlen);
	if (numlen < 4) {
	    yyerror("invalid Unicode escape");
	    return 0;
	}
	lex_p += 4;
        if (regexp_literal) {
            tokcopy(4);
        }
	else if (codepoint >= 0x80) {
	    *encp = UTF8_ENC();
	    if (string_literal) tokaddmbc(codepoint, *encp);
	}
	else if (string_literal) {
	    if (codepoint == 0 && symbol_literal) {
		yyerror("symbol cannot contain '\\u0000'");
		return 0;
	    }

	    tokadd(codepoint);
	}
    }

    return codepoint;
}

#define ESCAPE_CONTROL 1
#define ESCAPE_META    2

static int
parser_read_escape(struct parser_params *parser, int flags,
		   rb_encoding **encp)
{
    int c;
    int numlen;

    switch (c = nextc()) {
      case '\\':	/* Backslash */
	return c;

      case 'n':	/* newline */
	return '\n';

      case 't':	/* horizontal tab */
	return '\t';

      case 'r':	/* carriage-return */
	return '\r';

      case 'f':	/* form-feed */
	return '\f';

      case 'v':	/* vertical tab */
	return '\13';

      case 'a':	/* alarm(bell) */
	return '\007';

      case 'e':	/* escape */
	return 033;

      case '0': case '1': case '2': case '3': /* octal constant */
      case '4': case '5': case '6': case '7':
	if (flags & (ESCAPE_CONTROL|ESCAPE_META)) goto eof;
	{
	    int numlen;

	    pushback(c);
	    c = scan_oct(lex_p, 3, &numlen);
	    lex_p += numlen;
	}
	return c;

      case 'x':	/* hex constant */
	if (flags & (ESCAPE_CONTROL|ESCAPE_META)) goto eof;
	c = tok_hex(&numlen);
	if (numlen == 0) return 0;
	return c;

      case 'b':	/* backspace */
	return '\010';

      case 's':	/* space */
	return ' ';

      case 'M':
	if (flags & ESCAPE_META) goto eof;
	if ((c = nextc()) != '-') {
	    pushback(c);
	    goto eof;
	}
	if ((c = nextc()) == '\\') {
	    return read_escape(flags|ESCAPE_META, encp) | 0x80;
	}
	else if (c == -1 || !ISASCII(c)) goto eof;
	else {
	    return ((c & 0xff) | 0x80);
	}

      case 'C':
	if ((c = nextc()) != '-') {
	    pushback(c);
	    goto eof;
	}
      case 'c':
	if (flags & ESCAPE_CONTROL) goto eof;
	if ((c = nextc())== '\\') {
	    c = read_escape(flags|ESCAPE_CONTROL, encp);
	}
	else if (c == '?')
	    return 0177;
	else if (c == -1 || !ISASCII(c)) goto eof;
	return c & 0x9f;

      eof:
      case -1:
        yyerror("Invalid escape character syntax");
	return '\0';

      default:
	return c;
    }
}

static void
parser_tokaddmbc(struct parser_params *parser, int c, rb_encoding *enc)
{
    int len = rb_enc_codelen(c, enc);
    rb_enc_mbcput(c, tokspace(len), enc);
}

static int
parser_tokadd_escape(struct parser_params *parser, rb_encoding **encp)
{
    int c;
    int flags = 0;

  first:
    switch (c = nextc()) {
      case '\n':
	return 0;		/* just ignore */

      case '0': case '1': case '2': case '3': /* octal constant */
      case '4': case '5': case '6': case '7':
	if (flags & (ESCAPE_CONTROL|ESCAPE_META)) goto eof;
	{
	    int numlen;
	    int oct;

	    oct = scan_oct(--lex_p, 3, &numlen);
	    if (numlen == 0) goto eof;
	    lex_p += numlen;
	    tokcopy(numlen + 1);
	}
	return 0;

      case 'x':	/* hex constant */
	if (flags & (ESCAPE_CONTROL|ESCAPE_META)) goto eof;
	{
	    int numlen;
	    int hex;

	    hex = tok_hex(&numlen);
	    if (numlen == 0) goto eof;
	    tokcopy(numlen + 2);
	}
	return 0;

      case 'M':
	if (flags & ESCAPE_META) goto eof;
	if ((c = nextc()) != '-') {
	    pushback(c);
	    goto eof;
	}
	tokcopy(3);
	flags |= ESCAPE_META;
	goto escaped;

      case 'C':
	if (flags & ESCAPE_CONTROL) goto eof;
	if ((c = nextc()) != '-') {
	    pushback(c);
	    goto eof;
	}
	tokcopy(3);
	goto escaped;

      case 'c':
	if (flags & ESCAPE_CONTROL) goto eof;
	tokcopy(2);
	flags |= ESCAPE_CONTROL;
      escaped:
	if ((c = nextc()) == '\\') {
	    goto first;
	}
	else if (c == -1) goto eof;
	tokadd(c);
	return 0;

      eof:
      case -1:
        yyerror("Invalid escape character syntax");
	return -1;

      default:
        tokadd('\\');
	tokadd(c);
    }
    return 0;
}

extern int rb_char_to_option_kcode(int c, int *option, int *kcode);

static int
parser_regx_options(struct parser_params *parser)
{
    int kcode = 0;
    int options = 0;
    int c, opt, kc;

    newtok();
    while (c = nextc(), ISALPHA(c)) {
        if (c == 'o') {
            options |= RE_OPTION_ONCE;
        }
        else if (rb_char_to_option_kcode(c, &opt, &kc)) {
            options |= opt;
	    if (kc >= 0) kcode = c;
        }
        else {
	    tokadd(c);
        }
    }
    pushback(c);
    if (toklen()) {
	tokfix();
	compile_error(PARSER_ARG "unknown regexp option%s - %s",
		      toklen() > 1 ? "s" : "", tok());
    }
    return options | RE_OPTION_ENCODING(kcode);
}

static void
dispose_string(VALUE str)
{
    /* TODO: should use another API? */
    if (RBASIC(str)->flags & RSTRING_NOEMBED)
	xfree(RSTRING_PTR(str));
    rb_gc_force_recycle(str);
}

static int
parser_tokadd_mbchar(struct parser_params *parser, int c)
{
    int len = parser_precise_mbclen();
    if (!MBCLEN_CHARFOUND_P(len)) {
	compile_error(PARSER_ARG "invalid multibyte char (%s)", parser_encoding_name());
	return -1;
    }
    tokadd(c);
    lex_p += --len;
    if (len > 0) tokcopy(len);
    return c;
}

#define tokadd_mbchar(c) parser_tokadd_mbchar(parser, c)

static int
parser_tokadd_string(struct parser_params *parser,
		     int func, int term, int paren, long *nest,
		     rb_encoding **encp)
{
    int c;
    int has_nonascii = 0;
    rb_encoding *enc = *encp;
    char *errbuf = 0;
    static const char mixed_msg[] = "%s mixed within %s source";

#define mixed_error(enc1, enc2) if (!errbuf) {	\
	int len = sizeof(mixed_msg) - 4;	\
	len += strlen(rb_enc_name(enc1));	\
	len += strlen(rb_enc_name(enc2));	\
	errbuf = ALLOCA_N(char, len);		\
	snprintf(errbuf, len, mixed_msg,	\
		 rb_enc_name(enc1),		\
		 rb_enc_name(enc2));		\
	yyerror(errbuf);			\
    }
#define mixed_escape(beg, enc1, enc2) do {	\
	const char *pos = lex_p;		\
	lex_p = beg;				\
	mixed_error(enc1, enc2);		\
	lex_p = pos;				\
    } while (0)

    while ((c = nextc()) != -1) {
	if (paren && c == paren) {
	    ++*nest;
	}
	else if (c == term) {
	    if (!nest || !*nest) {
		pushback(c);
		break;
	    }
	    --*nest;
	}
	else if ((func & STR_FUNC_EXPAND) && c == '#' && lex_p < lex_pend) {
	    int c2 = *lex_p;
	    if (c2 == '$' || c2 == '@' || c2 == '{') {
		pushback(c);
		break;
	    }
	}
	else if (c == '\\') {
	    const char *beg = lex_p - 1;
	    c = nextc();
	    switch (c) {
	      case '\n':
		if (func & STR_FUNC_QWORDS) break;
		if (func & STR_FUNC_EXPAND) continue;
		tokadd('\\');
		break;

	      case '\\':
		if (func & STR_FUNC_ESCAPE) tokadd(c);
		break;

	      case 'u':
		if ((func & STR_FUNC_EXPAND) == 0) {
		    tokadd('\\');
		    break;
		}
		parser_tokadd_utf8(parser, &enc, 1,
				   func & STR_FUNC_SYMBOL,
                                   func & STR_FUNC_REGEXP);
		if (has_nonascii && enc != *encp) {
		    mixed_escape(beg, enc, *encp);
		}
		continue;

	      default:
		if (func & STR_FUNC_REGEXP) {
		    pushback(c);
		    if ((c = tokadd_escape(&enc)) < 0)
			return -1;
		    if (has_nonascii && enc != *encp) {
			mixed_escape(beg, enc, *encp);
		    }
		    continue;
		}
		else if (func & STR_FUNC_EXPAND) {
		    pushback(c);
		    if (func & STR_FUNC_ESCAPE) tokadd('\\');
		    c = read_escape(0, &enc);
		}
		else if ((func & STR_FUNC_QWORDS) && ISSPACE(c)) {
		    /* ignore backslashed spaces in %w */
		}
		else if (c != term && !(paren && c == paren)) {
		    tokadd('\\');
		}
	    }
	}
	else if (!parser_isascii()) {
	    has_nonascii = 1;
	    if (enc != *encp) {
		mixed_error(enc, *encp);
		continue;
	    }
	    if (tokadd_mbchar(c) == -1) return -1;
	    continue;
	}
	else if ((func & STR_FUNC_QWORDS) && ISSPACE(c)) {
	    pushback(c);
	    break;
	}
	if (!c && (func & STR_FUNC_SYMBOL)) {
	    func &= ~STR_FUNC_SYMBOL;
	    compile_error(PARSER_ARG "symbol cannot contain '\\0'");
	    continue;
	}
        if (c & 0x80) {
            has_nonascii = 1;
	    if (enc != *encp) {
		mixed_error(enc, *encp);
		continue;
	    }
        }
	tokadd(c);
    }
    *encp = enc;
    return c;
}

#define NEW_STRTERM(func, term, paren) \
	rb_node_newnode(NODE_STRTERM, (func), (term) | ((paren) << (CHAR_BIT * 2)), 0)

static int
parser_parse_string(struct parser_params *parser, NODE *quote)
{
    int func = quote->nd_func;
    int term = nd_term(quote);
    int paren = nd_paren(quote);
    int c, space = 0;
    rb_encoding *enc = parser->enc;

    if (func == -1) return tSTRING_END;
    c = nextc();
    if ((func & STR_FUNC_QWORDS) && ISSPACE(c)) {
	do {c = nextc();} while (ISSPACE(c));
	space = 1;
    }
    if (c == term && !quote->nd_nest) {
	if (func & STR_FUNC_QWORDS) {
	    quote->nd_func = -1;
	    return ' ';
	}
	if (!(func & STR_FUNC_REGEXP)) return tSTRING_END;
        set_yylval_num(regx_options());
	return tREGEXP_END;
    }
    if (space) {
	pushback(c);
	return ' ';
    }
    newtok();
    if ((func & STR_FUNC_EXPAND) && c == '#') {
	switch (c = nextc()) {
	  case '$':
	  case '@':
	    pushback(c);
	    return tSTRING_DVAR;
	  case '{':
	    return tSTRING_DBEG;
	}
	tokadd('#');
    }
    pushback(c);
    if (tokadd_string(func, term, paren, &quote->nd_nest,
		      &enc) == -1) {
	ruby_sourceline = nd_line(quote);
	if (func & STR_FUNC_REGEXP) {
	    if (parser->eofp)
		compile_error(PARSER_ARG "unterminated regexp meets end of file");
	    return tREGEXP_END;
	}
	else {
	    if (parser->eofp)
		compile_error(PARSER_ARG "unterminated string meets end of file");
	    return tSTRING_END;
	}
    }

    tokfix();
    set_yylval_str(STR_NEW3(tok(), toklen(), enc, func));
    return tSTRING_CONTENT;
}

static int
parser_heredoc_identifier(struct parser_params *parser)
{
    int c = nextc(), term, func = 0, len;

    if (c == '-') {
	c = nextc();
	func = STR_FUNC_INDENT;
    }
    switch (c) {
      case '\'':
	func |= str_squote; goto quoted;
      case '"':
	func |= str_dquote; goto quoted;
      case '`':
	func |= str_xquote;
      quoted:
	newtok();
	tokadd(func);
	term = c;
	while ((c = nextc()) != -1 && c != term) {
	    if (tokadd_mbchar(c) == -1) return 0;
	}
	if (c == -1) {
	    compile_error(PARSER_ARG "unterminated here document identifier");
	    return 0;
	}
	break;

      default:
	if (!parser_is_identchar()) {
	    pushback(c);
	    if (func & STR_FUNC_INDENT) {
		pushback('-');
	    }
	    return 0;
	}
	newtok();
	term = '"';
	tokadd(func |= str_dquote);
	do {
	    if (tokadd_mbchar(c) == -1) return 0;
	} while ((c = nextc()) != -1 && parser_is_identchar());
	pushback(c);
	break;
    }

    tokfix();
#ifdef RIPPER
    ripper_dispatch_scan_event(parser, tHEREDOC_BEG);
#endif
    len = lex_p - lex_pbeg;
    lex_goto_eol(parser);
    lex_strterm = rb_node_newnode(NODE_HEREDOC,
				  STR_NEW(tok(), toklen()),	/* nd_lit */
				  len,				/* nd_nth */
				  lex_lastline);		/* nd_orig */
    nd_set_line(lex_strterm, ruby_sourceline);
    ripper_flush(parser);
    return term == '`' ? tXSTRING_BEG : tSTRING_BEG;
}

static void
parser_heredoc_restore(struct parser_params *parser, NODE *here)
{
    VALUE line;

    line = here->nd_orig;
    lex_lastline = line;
    lex_pbeg = RSTRING_PTR(line);
    lex_pend = lex_pbeg + RSTRING_LEN(line);
    lex_p = lex_pbeg + here->nd_nth;
    heredoc_end = ruby_sourceline;
    ruby_sourceline = nd_line(here);
    dispose_string(here->nd_lit);
    rb_gc_force_recycle((VALUE)here);
    ripper_flush(parser);
}

static int
parser_whole_match_p(struct parser_params *parser,
    const char *eos, int len, int indent)
{
    const char *p = lex_pbeg;
    int n;

    if (indent) {
	while (*p && ISSPACE(*p)) p++;
    }
    n= lex_pend - (p + len);
    if (n < 0 || (n > 0 && p[len] != '\n' && p[len] != '\r')) return Qfalse;
    if (strncmp(eos, p, len) == 0) return Qtrue;
    return Qfalse;
}

static int
parser_here_document(struct parser_params *parser, NODE *here)
{
    int c, func, indent = 0;
    const char *eos, *p, *pend;
    long len;
    VALUE str = 0;
    rb_encoding *enc = parser->enc;

    eos = RSTRING_PTR(here->nd_lit);
    len = RSTRING_LEN(here->nd_lit) - 1;
    indent = (func = *eos++) & STR_FUNC_INDENT;

    if ((c = nextc()) == -1) {
      error:
	compile_error(PARSER_ARG "can't find string \"%s\" anywhere before EOF", eos);
#ifdef RIPPER
	if (NIL_P(parser->delayed)) {
	    ripper_dispatch_scan_event(parser, tSTRING_CONTENT);
	}
	else {
	    if (str ||
		((len = lex_p - parser->tokp) > 0 &&
		 (str = STR_NEW3(parser->tokp, len, enc, func), 1))) {
		rb_str_append(parser->delayed, str);
	    }
	    ripper_dispatch_delayed_token(parser, tSTRING_CONTENT);
	}
	lex_goto_eol(parser);
#endif
      restore:
	heredoc_restore(lex_strterm);
	lex_strterm = 0;
	return 0;
    }
    if (was_bol() && whole_match_p(eos, len, indent)) {
	heredoc_restore(lex_strterm);
	return tSTRING_END;
    }

    if (!(func & STR_FUNC_EXPAND)) {
	do {
	    p = RSTRING_PTR(lex_lastline);
	    pend = lex_pend;
	    if (pend > p) {
		switch (pend[-1]) {
		  case '\n':
		    if (--pend == p || pend[-1] != '\r') {
			pend++;
			break;
		    }
		  case '\r':
		    --pend;
		}
	    }
	    if (str)
		rb_str_cat(str, p, pend - p);
	    else
		str = STR_NEW(p, pend - p);
	    if (pend < lex_pend) rb_str_cat(str, "\n", 1);
	    lex_goto_eol(parser);
	    if (nextc() == -1) {
		if (str) dispose_string(str);
		goto error;
	    }
	} while (!whole_match_p(eos, len, indent));
    }
    else {
	/*	int mb = ENC_CODERANGE_7BIT, *mbp = &mb;*/
	newtok();
	if (c == '#') {
	    switch (c = nextc()) {
	      case '$':
	      case '@':
		pushback(c);
		return tSTRING_DVAR;
	      case '{':
		return tSTRING_DBEG;
	    }
	    tokadd('#');
	}
	do {
	    pushback(c);
	    if ((c = tokadd_string(func, '\n', 0, NULL, &enc)) == -1) {
		if (parser->eofp) goto error;
		goto restore;
	    }
	    if (c != '\n') {
		set_yylval_str(STR_NEW3(tok(), toklen(), enc, func));
		return tSTRING_CONTENT;
	    }
	    tokadd(nextc());
	    /*	    if (mbp && mb == ENC_CODERANGE_UNKNOWN) mbp = 0;*/
	    if ((c = nextc()) == -1) goto error;
	} while (!whole_match_p(eos, len, indent));
	str = STR_NEW3(tok(), toklen(), enc, func);
    }
#ifdef RIPPER
    if (!NIL_P(parser->delayed))
	ripper_dispatch_delayed_token(parser, tSTRING_CONTENT);
    lex_goto_eol(parser);
    ripper_dispatch_ignored_scan_event(parser, tHEREDOC_END);
#endif
    heredoc_restore(lex_strterm);
    lex_strterm = NEW_STRTERM(-1, 0, 0);
    set_yylval_str(str);
    return tSTRING_CONTENT;
}

#include "lex.c"

static void
arg_ambiguous_gen(struct parser_params *parser)
{
#ifndef RIPPER
    rb_warning0("ambiguous first argument; put parentheses or even spaces");
#else
    dispatch0(arg_ambiguous);
#endif
}
#define arg_ambiguous() arg_ambiguous_gen(parser)

static ID
formal_argument_gen(struct parser_params *parser, ID lhs)
{
#ifndef RIPPER
    if (!is_local_id(lhs))
	yyerror("formal argument must be local variable");
#endif
    shadowing_lvar(lhs);
    return lhs;
}

static int
lvar_defined_gen(struct parser_params *parser, ID id)
{
    return (dyna_in_block() && dvar_defined(id)) || local_id(id);
}

/* emacsen -*- hack */
static int
parser_encode_length(struct parser_params *parser, const char *name, int len)
{
    int nlen;

    if (len > 5 && name[nlen = len - 5] == '-') {
	if (rb_memcicmp(name + nlen + 1, "unix", 4) == 0)
	    return nlen;
    }
    if (len > 4 && name[nlen = len - 5] == '-') {
	if (rb_memcicmp(name + nlen + 1, "dos", 3) == 0)
	    return nlen;
	if (rb_memcicmp(name + nlen + 1, "mac", 3) == 0)
	    return nlen;
    }
    return len;
}

static void
parser_set_encode(struct parser_params *parser, const char *name)
{
    int idx = rb_enc_find_index(name);
    rb_encoding *enc;
    VALUE excargs[3];

    if (idx < 0) {
	VALUE rb_make_backtrace(void);
	VALUE rb_make_exception(int, VALUE*);

	excargs[1] = rb_sprintf("unknown encoding name: %s", name);
      error:
	excargs[0] = rb_eArgError;
	excargs[2] = rb_make_backtrace();
	rb_ary_unshift(excargs[2], rb_sprintf("%s:%d", ruby_sourcefile, ruby_sourceline));
	rb_exc_raise(rb_make_exception(3, excargs));
    }
    enc = rb_enc_from_index(idx);
    if (!rb_enc_asciicompat(enc)) {
	excargs[1] = rb_sprintf("%s is not ASCII compatible", rb_enc_name(enc));
	goto error;
    }
    parser->enc = enc;
}

static int
comment_at_top(struct parser_params *parser)
{
    const char *p = lex_pbeg, *pend = lex_p - 1;
    if (parser->line_count != (parser->has_shebang ? 2 : 1)) return 0;
    while (p < pend) {
	if (!ISSPACE(*p)) return 0;
	p++;
    }
    return 1;
}

#ifndef RIPPER
typedef int (*rb_magic_comment_length_t)(struct parser_params *parser, const char *name, int len);
typedef void (*rb_magic_comment_setter_t)(struct parser_params *parser, const char *name, const char *val);

static void
magic_comment_encoding(struct parser_params *parser, const char *name, const char *val)
{
    if (!comment_at_top(parser)) {
	rb_warningS("encoding '%s' is ignored, valid only in the first line except for shebang line.",
		    val);
	return;
    }
    parser_set_encode(parser, val);
}

struct magic_comment {
    const char *name;
    rb_magic_comment_setter_t func;
    rb_magic_comment_length_t length;
};

static const struct magic_comment magic_comments[] = {
    {"coding", magic_comment_encoding, parser_encode_length},
    {"encoding", magic_comment_encoding, parser_encode_length},
};
#endif

static const char *
magic_comment_marker(const char *str, int len)
{
    int i = 2;

    while (i < len) {
	switch (str[i]) {
	  case '-':
	    if (str[i-1] == '*' && str[i-2] == '-') {
		return str + i + 1;
	    }
	    i += 2;
	    break;
	  case '*':
	    if (i + 1 >= len) return 0;
	    if (str[i+1] != '-') {
		i += 4;
	    }
	    else if (str[i-1] != '-') {
		i += 2;
	    }
	    else {
		return str + i + 2;
	    }
	    break;
	  default:
	    i += 3;
	    break;
	}
    }
    return 0;
}

static int
parser_magic_comment(struct parser_params *parser, const char *str, int len)
{
    VALUE name = 0, val = 0;
    const char *beg, *end, *vbeg, *vend;
#define str_copy(_s, _p, _n) ((_s) \
	? (rb_str_resize((_s), (_n)), \
	   MEMCPY(RSTRING_PTR(_s), (_p), char, (_n)), (_s)) \
	: ((_s) = STR_NEW((_p), (_n))))

    if (len <= 7) return Qfalse;
    if (!(beg = magic_comment_marker(str, len))) return Qfalse;
    if (!(end = magic_comment_marker(beg, str + len - beg))) return Qfalse;
    str = beg;
    len = end - beg - 3;

    /* %r"([^\\s\'\":;]+)\\s*:\\s*(\"(?:\\\\.|[^\"])*\"|[^\"\\s;]+)[\\s;]*" */
    while (len > 0) {
#ifndef RIPPER
	const struct magic_comment *p = magic_comments;
#endif
	char *s;
	int i, n = 0;

	for (; len > 0 && *str; str++, --len) {
	    switch (*str) {
	      case '\'': case '"': case ':': case ';':
		continue;
	    }
	    if (!ISSPACE(*str)) break;
	}
	for (beg = str; len > 0; str++, --len) {
	    switch (*str) {
	      case '\'': case '"': case ':': case ';':
		break;
	      default:
		if (ISSPACE(*str)) break;
		continue;
	    }
	    break;
	}
	for (end = str; len > 0 && ISSPACE(*str); str++, --len);
	if (!len) break;
	if (*str != ':') continue;

	do str++; while (--len > 0 && ISSPACE(*str));
	if (!len) break;
	if (*str == '"') {
	    for (vbeg = ++str; --len > 0 && *str != '"'; str++) {
		if (*str == '\\') {
		    --len;
		    ++str;
		}
	    }
	    vend = str;
	    if (len) {
		--len;
		++str;
	    }
	}
	else {
	    for (vbeg = str; len > 0 && *str != '"' && *str != ';' && !ISSPACE(*str); --len, str++);
	    vend = str;
	}
	while (len > 0 && (*str == ';' || ISSPACE(*str))) --len, str++;

	n = end - beg;
	str_copy(name, beg, n);
	s = RSTRING_PTR(name);
	for (i = 0; i < n; ++i) {
	    if (*s == '-') *s = '_';
	}
#ifndef RIPPER
	do {
	    if (STRNCASECMP(p->name, s, n) == 0) {
		n = vend - vbeg;
		if (p->length) {
		    n = (*p->length)(parser, vbeg, n);
		}
		str_copy(val, vbeg, n);
		(*p->func)(parser, s, RSTRING_PTR(val));
		break;
	    }
	} while (++p < magic_comments + sizeof(magic_comments) / sizeof(*p));
#else
	dispatch2(magic_comment, name, val);
#endif
    }

    return Qtrue;
}

static void
set_file_encoding(struct parser_params *parser, const char *str, const char *send)
{
    int sep = 0;
    const char *beg = str;
    VALUE s;

    for (;;) {
	if (send - str <= 6) return;
	switch (str[6]) {
	  case 'C': case 'c': str += 6; continue;
	  case 'O': case 'o': str += 5; continue;
	  case 'D': case 'd': str += 4; continue;
	  case 'I': case 'i': str += 3; continue;
	  case 'N': case 'n': str += 2; continue;
	  case 'G': case 'g': str += 1; continue;
	  case '=': case ':':
	    sep = 1;
	    str += 6;
	    break;
	  default:
	    str += 6;
	    if (ISSPACE(*str)) break;
	    continue;
	}
	if (STRNCASECMP(str-6, "coding", 6) == 0) break;
    }
    for (;;) {
	do {
	    if (++str >= send) return;
	} while (ISSPACE(*str));
	if (sep) break;
	if (*str != '=' && *str != ':') return;
	sep = 1;
	str++;
    }
    beg = str;
    while ((*str == '-' || *str == '_' || ISALNUM(*str)) && ++str < send);
    s = rb_str_new(beg, parser_encode_length(parser, beg, str - beg));
    parser_set_encode(parser, RSTRING_PTR(s));
    rb_str_resize(s, 0);
}

static void
parser_prepare(struct parser_params *parser)
{
    int c = nextc();
    switch (c) {
      case '#':
	if (peek('!')) parser->has_shebang = 1;
	break;
      case 0xef:		/* UTF-8 BOM marker */
	if (lex_pend - lex_p >= 2 &&
	    (unsigned char)lex_p[0] == 0xbb &&
	    (unsigned char)lex_p[1] == 0xbf) {
	    parser->enc = rb_utf8_encoding();
	    lex_p += 2;
	    lex_pbeg = lex_p;
	    return;
	}
	break;
      case EOF:
	return;
    }
    pushback(c);
    parser->enc = rb_enc_get(lex_lastline);
}

#define IS_ARG() (lex_state == EXPR_ARG || lex_state == EXPR_CMDARG)
#define IS_BEG() (lex_state == EXPR_BEG || lex_state == EXPR_MID || lex_state == EXPR_VALUE || lex_state == EXPR_CLASS)

static int
parser_yylex(struct parser_params *parser)
{
    register int c;
    int space_seen = 0;
    int cmd_state;
    enum lex_state_e last_state;
    rb_encoding *enc;
    int mb;
#ifdef RIPPER
    int fallthru = Qfalse;
#endif

    if (lex_strterm) {
	int token;
	if (nd_type(lex_strterm) == NODE_HEREDOC) {
	    token = here_document(lex_strterm);
	    if (token == tSTRING_END) {
		lex_strterm = 0;
		lex_state = EXPR_END;
	    }
	}
	else {
	    token = parse_string(lex_strterm);
	    if (token == tSTRING_END || token == tREGEXP_END) {
		rb_gc_force_recycle((VALUE)lex_strterm);
		lex_strterm = 0;
		lex_state = EXPR_END;
	    }
	}
	return token;
    }
    cmd_state = command_start;
    command_start = Qfalse;
  retry:
    switch (c = nextc()) {
      case '\0':		/* NUL */
      case '\004':		/* ^D */
      case '\032':		/* ^Z */
      case -1:			/* end of script. */
	return 0;

	/* white spaces */
      case ' ': case '\t': case '\f': case '\r':
      case '\13': /* '\v' */
	space_seen++;
#ifdef RIPPER
	while ((c = nextc())) {
	    switch (c) {
	      case ' ': case '\t': case '\f': case '\r':
	      case '\13': /* '\v' */
		break;
	      default:
		goto outofloop;
	    }
	}
      outofloop:
	pushback(c);
	ripper_dispatch_scan_event(parser, tSP);
#endif
	goto retry;

      case '#':		/* it's a comment */
	/* no magic_comment in shebang line */
	if (!parser_magic_comment(parser, lex_p, lex_pend - lex_p)) {
	    if (comment_at_top(parser)) {
		set_file_encoding(parser, lex_p, lex_pend);
	    }
	}
	lex_p = lex_pend;
#ifdef RIPPER
        ripper_dispatch_scan_event(parser, tCOMMENT);
        fallthru = Qtrue;
#endif
	/* fall through */
      case '\n':
	switch (lex_state) {
	  case EXPR_BEG:
	  case EXPR_FNAME:
	  case EXPR_DOT:
	  case EXPR_CLASS:
	  case EXPR_VALUE:
#ifdef RIPPER
            if (!fallthru) {
                ripper_dispatch_scan_event(parser, tIGNORED_NL);
            }
            fallthru = Qfalse;
#endif
	    goto retry;
	  default:
	    break;
	}
	while ((c = nextc())) {
	    switch (c) {
	      case ' ': case '\t': case '\f': case '\r':
	      case '\13': /* '\v' */
		space_seen++;
		break;
	      case '.': {
		  if ((c = nextc()) != '.') {
		      pushback(c);
		      pushback('.');
		      goto retry;
		  }
	      }
	      default:
		--ruby_sourceline;
		lex_nextline = lex_lastline;
	      case -1:		/* EOF no decrement*/
		lex_goto_eol(parser);
#ifdef RIPPER
		if (c != -1) {
		    parser->tokp = lex_p;
		}
#endif
		goto normal_newline;
	    }
	}
      normal_newline:
	command_start = Qtrue;
	lex_state = EXPR_BEG;
	return '\n';

      case '*':
	if ((c = nextc()) == '*') {
	    if ((c = nextc()) == '=') {
                set_yylval_id(tPOW);
		lex_state = EXPR_BEG;
		return tOP_ASGN;
	    }
	    pushback(c);
	    c = tPOW;
	}
	else {
	    if (c == '=') {
                set_yylval_id('*');
		lex_state = EXPR_BEG;
		return tOP_ASGN;
	    }
	    pushback(c);
	    if (IS_ARG() && space_seen && !ISSPACE(c)) {
		rb_warning0("`*' interpreted as argument prefix");
		c = tSTAR;
	    }
	    else if (IS_BEG()) {
		c = tSTAR;
	    }
	    else {
		c = '*';
	    }
	}
	switch (lex_state) {
	  case EXPR_FNAME: case EXPR_DOT:
	    lex_state = EXPR_ARG; break;
	  default:
	    lex_state = EXPR_BEG; break;
	}
	return c;

      case '!':
	c = nextc();
	if (lex_state == EXPR_FNAME || lex_state == EXPR_DOT) {
	    lex_state = EXPR_ARG;
	    if (c == '@') {
		return '!';
	    }
	}
	else {
	    lex_state = EXPR_BEG;
	}
	if (c == '=') {
	    return tNEQ;
	}
	if (c == '~') {
	    return tNMATCH;
	}
	pushback(c);
	return '!';

      case '=':
	if (was_bol()) {
	    /* skip embedded rd document */
	    if (strncmp(lex_p, "begin", 5) == 0 && ISSPACE(lex_p[5])) {
#ifdef RIPPER
                int first_p = Qtrue;

                lex_goto_eol(parser);
                ripper_dispatch_scan_event(parser, tEMBDOC_BEG);
#endif
		for (;;) {
		    lex_goto_eol(parser);
#ifdef RIPPER
                    if (!first_p) {
                        ripper_dispatch_scan_event(parser, tEMBDOC);
                    }
                    first_p = Qfalse;
#endif
		    c = nextc();
		    if (c == -1) {
			compile_error(PARSER_ARG "embedded document meets end of file");
			return 0;
		    }
		    if (c != '=') continue;
		    if (strncmp(lex_p, "end", 3) == 0 &&
			(lex_p + 3 == lex_pend || ISSPACE(lex_p[3]))) {
			break;
		    }
		}
		lex_goto_eol(parser);
#ifdef RIPPER
                ripper_dispatch_scan_event(parser, tEMBDOC_END);
#endif
		goto retry;
	    }
	}

	switch (lex_state) {
	  case EXPR_FNAME: case EXPR_DOT:
	    lex_state = EXPR_ARG; break;
	  default:
	    lex_state = EXPR_BEG; break;
	}
	if ((c = nextc()) == '=') {
	    if ((c = nextc()) == '=') {
		return tEQQ;
	    }
	    pushback(c);
	    return tEQ;
	}
	if (c == '~') {
	    return tMATCH;
	}
	else if (c == '>') {
	    return tASSOC;
	}
	pushback(c);
	return '=';

      case '<':
	c = nextc();
	if (c == '<' &&
	    lex_state != EXPR_END &&
	    lex_state != EXPR_DOT &&
	    lex_state != EXPR_ENDARG &&
	    lex_state != EXPR_CLASS &&
	    (!IS_ARG() || space_seen)) {
	    int token = heredoc_identifier();
	    if (token) return token;
	}
	switch (lex_state) {
	  case EXPR_FNAME: case EXPR_DOT:
	    lex_state = EXPR_ARG; break;
	  default:
	    lex_state = EXPR_BEG; break;
	}
	if (c == '=') {
	    if ((c = nextc()) == '>') {
		return tCMP;
	    }
	    pushback(c);
	    return tLEQ;
	}
	if (c == '<') {
	    if ((c = nextc()) == '=') {
                set_yylval_id(tLSHFT);
		lex_state = EXPR_BEG;
		return tOP_ASGN;
	    }
	    pushback(c);
	    return tLSHFT;
	}
	pushback(c);
	return '<';

      case '>':
	switch (lex_state) {
	  case EXPR_FNAME: case EXPR_DOT:
	    lex_state = EXPR_ARG; break;
	  default:
	    lex_state = EXPR_BEG; break;
	}
	if ((c = nextc()) == '=') {
	    return tGEQ;
	}
	if (c == '>') {
	    if ((c = nextc()) == '=') {
                set_yylval_id(tRSHFT);
		lex_state = EXPR_BEG;
		return tOP_ASGN;
	    }
	    pushback(c);
	    return tRSHFT;
	}
	pushback(c);
	return '>';

      case '"':
	lex_strterm = NEW_STRTERM(str_dquote, '"', 0);
	return tSTRING_BEG;

      case '`':
	if (lex_state == EXPR_FNAME) {
	    lex_state = EXPR_END;
	    return c;
	}
	if (lex_state == EXPR_DOT) {
	    if (cmd_state)
		lex_state = EXPR_CMDARG;
	    else
		lex_state = EXPR_ARG;
	    return c;
	}
	lex_strterm = NEW_STRTERM(str_xquote, '`', 0);
	return tXSTRING_BEG;

      case '\'':
	lex_strterm = NEW_STRTERM(str_squote, '\'', 0);
	return tSTRING_BEG;

      case '?':
	if (lex_state == EXPR_END || lex_state == EXPR_ENDARG) {
	    lex_state = EXPR_VALUE;
	    return '?';
	}
	c = nextc();
	if (c == -1) {
	    compile_error(PARSER_ARG "incomplete character syntax");
	    return 0;
	}
	if (rb_enc_isspace(c, parser->enc)) {
	    if (!IS_ARG()) {
		int c2 = 0;
		switch (c) {
		  case ' ':
		    c2 = 's';
		    break;
		  case '\n':
		    c2 = 'n';
		    break;
		  case '\t':
		    c2 = 't';
		    break;
		  case '\v':
		    c2 = 'v';
		    break;
		  case '\r':
		    c2 = 'r';
		    break;
		  case '\f':
		    c2 = 'f';
		    break;
		}
		if (c2) {
		    rb_warnI("invalid character syntax; use ?\\%c", c2);
		}
	    }
	  ternary:
	    pushback(c);
	    lex_state = EXPR_VALUE;
	    return '?';
	}
	newtok();
	enc = parser->enc;
	if (!parser_isascii()) {
	    if (tokadd_mbchar(c) == -1) return 0;
	}
	else if ((rb_enc_isalnum(c, parser->enc) || c == '_') &&
		 lex_p < lex_pend && is_identchar(lex_p, lex_pend, parser->enc)) {
	    goto ternary;
	}
        else if (c == '\\') {
            if (peek('u')) {
                nextc();
                c = parser_tokadd_utf8(parser, &enc, 0, 0, 0);
                if (0x80 <= c) {
                    tokaddmbc(c, enc);
                }
                else {
                    tokadd(c);
                }
            }
            else {
                c = read_escape(0, &enc);
                tokadd(c);
            }
        }
        else {
	    tokadd(c);
        }
	tokfix();
	set_yylval_str(STR_NEW3(tok(), toklen(), enc, 0));
	lex_state = EXPR_END;
	return tCHAR;

      case '&':
	if ((c = nextc()) == '&') {
	    lex_state = EXPR_BEG;
	    if ((c = nextc()) == '=') {
                set_yylval_id(tANDOP);
		lex_state = EXPR_BEG;
		return tOP_ASGN;
	    }
	    pushback(c);
	    return tANDOP;
	}
	else if (c == '=') {
            set_yylval_id('&');
	    lex_state = EXPR_BEG;
	    return tOP_ASGN;
	}
	pushback(c);
	if (IS_ARG() && space_seen && !ISSPACE(c)) {
	    rb_warning0("`&' interpreted as argument prefix");
	    c = tAMPER;
	}
	else if (IS_BEG()) {
	    c = tAMPER;
	}
	else {
	    c = '&';
	}
	switch (lex_state) {
	  case EXPR_FNAME: case EXPR_DOT:
	    lex_state = EXPR_ARG; break;
	  default:
	    lex_state = EXPR_BEG;
	}
	return c;

      case '|':
	if ((c = nextc()) == '|') {
	    lex_state = EXPR_BEG;
	    if ((c = nextc()) == '=') {
                set_yylval_id(tOROP);
		lex_state = EXPR_BEG;
		return tOP_ASGN;
	    }
	    pushback(c);
	    return tOROP;
	}
	if (c == '=') {
            set_yylval_id('|');
	    lex_state = EXPR_BEG;
	    return tOP_ASGN;
	}
	if (lex_state == EXPR_FNAME || lex_state == EXPR_DOT) {
	    lex_state = EXPR_ARG;
	}
	else {
	    lex_state = EXPR_BEG;
	}
	pushback(c);
	return '|';

      case '+':
	c = nextc();
	if (lex_state == EXPR_FNAME || lex_state == EXPR_DOT) {
	    lex_state = EXPR_ARG;
	    if (c == '@') {
		return tUPLUS;
	    }
	    pushback(c);
	    return '+';
	}
	if (c == '=') {
            set_yylval_id('+');
	    lex_state = EXPR_BEG;
	    return tOP_ASGN;
	}
	if (IS_BEG() ||
	    (IS_ARG() && space_seen && !ISSPACE(c))) {
	    if (IS_ARG()) arg_ambiguous();
	    lex_state = EXPR_BEG;
	    pushback(c);
	    if (c != -1 && ISDIGIT(c)) {
		c = '+';
		goto start_num;
	    }
	    return tUPLUS;
	}
	lex_state = EXPR_BEG;
	pushback(c);
	return '+';

      case '-':
	c = nextc();
	if (lex_state == EXPR_FNAME || lex_state == EXPR_DOT) {
	    lex_state = EXPR_ARG;
	    if (c == '@') {
		return tUMINUS;
	    }
	    pushback(c);
	    return '-';
	}
	if (c == '=') {
            set_yylval_id('-');
	    lex_state = EXPR_BEG;
	    return tOP_ASGN;
	}
	if (c == '>') {
	    lex_state = EXPR_ARG;
	    return tLAMBDA;
	}
	if (IS_BEG() ||
	    (IS_ARG() && space_seen && !ISSPACE(c))) {
	    if (IS_ARG()) arg_ambiguous();
	    lex_state = EXPR_BEG;
	    pushback(c);
	    if (c != -1 && ISDIGIT(c)) {
		return tUMINUS_NUM;
	    }
	    return tUMINUS;
	}
	lex_state = EXPR_BEG;
	pushback(c);
	return '-';

      case '.':
	lex_state = EXPR_BEG;
	if ((c = nextc()) == '.') {
	    if ((c = nextc()) == '.') {
		return tDOT3;
	    }
	    pushback(c);
	    return tDOT2;
	}
	pushback(c);
	if (c != -1 && ISDIGIT(c)) {
	    yyerror("no .<digit> floating literal anymore; put 0 before dot");
	}
	lex_state = EXPR_DOT;
	return '.';

      start_num:
      case '0': case '1': case '2': case '3': case '4':
      case '5': case '6': case '7': case '8': case '9':
	{
	    int is_float, seen_point, seen_e, nondigit;

	    is_float = seen_point = seen_e = nondigit = 0;
	    lex_state = EXPR_END;
	    newtok();
	    if (c == '-' || c == '+') {
		tokadd(c);
		c = nextc();
	    }
	    if (c == '0') {
		int start = toklen();
		c = nextc();
		if (c == 'x' || c == 'X') {
		    /* hexadecimal */
		    c = nextc();
		    if (c != -1 && ISXDIGIT(c)) {
			do {
			    if (c == '_') {
				if (nondigit) break;
				nondigit = c;
				continue;
			    }
			    if (!ISXDIGIT(c)) break;
			    nondigit = 0;
			    tokadd(c);
			} while ((c = nextc()) != -1);
		    }
		    pushback(c);
		    tokfix();
		    if (toklen() == start) {
			yyerror("numeric literal without digits");
		    }
		    else if (nondigit) goto trailing_uc;
                    set_yylval_literal(rb_cstr_to_inum(tok(), 16, Qfalse));
		    return tINTEGER;
		}
		if (c == 'b' || c == 'B') {
		    /* binary */
		    c = nextc();
		    if (c == '0' || c == '1') {
			do {
			    if (c == '_') {
				if (nondigit) break;
				nondigit = c;
				continue;
			    }
			    if (c != '0' && c != '1') break;
			    nondigit = 0;
			    tokadd(c);
			} while ((c = nextc()) != -1);
		    }
		    pushback(c);
		    tokfix();
		    if (toklen() == start) {
			yyerror("numeric literal without digits");
		    }
		    else if (nondigit) goto trailing_uc;
                    set_yylval_literal(rb_cstr_to_inum(tok(), 2, Qfalse));
		    return tINTEGER;
		}
		if (c == 'd' || c == 'D') {
		    /* decimal */
		    c = nextc();
		    if (c != -1 && ISDIGIT(c)) {
			do {
			    if (c == '_') {
				if (nondigit) break;
				nondigit = c;
				continue;
			    }
			    if (!ISDIGIT(c)) break;
			    nondigit = 0;
			    tokadd(c);
			} while ((c = nextc()) != -1);
		    }
		    pushback(c);
		    tokfix();
		    if (toklen() == start) {
			yyerror("numeric literal without digits");
		    }
		    else if (nondigit) goto trailing_uc;
                    set_yylval_literal(rb_cstr_to_inum(tok(), 10, Qfalse));
		    return tINTEGER;
		}
		if (c == '_') {
		    /* 0_0 */
		    goto octal_number;
		}
		if (c == 'o' || c == 'O') {
		    /* prefixed octal */
		    c = nextc();
		    if (c == -1 || c == '_' || !ISDIGIT(c)) {
			yyerror("numeric literal without digits");
		    }
		}
		if (c >= '0' && c <= '7') {
		    /* octal */
		  octal_number:
	            do {
			if (c == '_') {
			    if (nondigit) break;
			    nondigit = c;
			    continue;
			}
			if (c < '0' || c > '9') break;
			if (c > '7') goto invalid_octal;
			nondigit = 0;
			tokadd(c);
		    } while ((c = nextc()) != -1);
		    if (toklen() > start) {
			pushback(c);
			tokfix();
			if (nondigit) goto trailing_uc;
                        set_yylval_literal(rb_cstr_to_inum(tok(), 8, Qfalse));
			return tINTEGER;
		    }
		    if (nondigit) {
			pushback(c);
			goto trailing_uc;
		    }
		}
		if (c > '7' && c <= '9') {
		  invalid_octal:
		    yyerror("Invalid octal digit");
		}
		else if (c == '.' || c == 'e' || c == 'E') {
		    tokadd('0');
		}
		else {
		    pushback(c);
                    set_yylval_literal(INT2FIX(0));
		    return tINTEGER;
		}
	    }

	    for (;;) {
		switch (c) {
		  case '0': case '1': case '2': case '3': case '4':
		  case '5': case '6': case '7': case '8': case '9':
		    nondigit = 0;
		    tokadd(c);
		    break;

		  case '.':
		    if (nondigit) goto trailing_uc;
		    if (seen_point || seen_e) {
			goto decode_num;
		    }
		    else {
			int c0 = nextc();
			if (c0 == -1 || !ISDIGIT(c0)) {
			    pushback(c0);
			    goto decode_num;
			}
			c = c0;
		    }
		    tokadd('.');
		    tokadd(c);
		    is_float++;
		    seen_point++;
		    nondigit = 0;
		    break;

		  case 'e':
		  case 'E':
		    if (nondigit) {
			pushback(c);
			c = nondigit;
			goto decode_num;
		    }
		    if (seen_e) {
			goto decode_num;
		    }
		    tokadd(c);
		    seen_e++;
		    is_float++;
		    nondigit = c;
		    c = nextc();
		    if (c != '-' && c != '+') continue;
		    tokadd(c);
		    nondigit = c;
		    break;

		  case '_':	/* `_' in number just ignored */
		    if (nondigit) goto decode_num;
		    nondigit = c;
		    break;

		  default:
		    goto decode_num;
		}
		c = nextc();
	    }

	  decode_num:
	    pushback(c);
	    tokfix();
	    if (nondigit) {
		char tmp[30];
	      trailing_uc:
		sprintf(tmp, "trailing `%c' in number", nondigit);
		yyerror(tmp);
	    }
	    if (is_float) {
		double d = strtod(tok(), 0);
		if (errno == ERANGE) {
		    rb_warningS("Float %s out of range", tok());
		    errno = 0;
		}
                set_yylval_literal(DBL2NUM(d));
		return tFLOAT;
	    }
            set_yylval_literal(rb_cstr_to_inum(tok(), 10, Qfalse));
	    return tINTEGER;
	}

      case ')':
      case ']':
	paren_nest--;
      case '}':
	COND_LEXPOP();
	CMDARG_LEXPOP();
	if (c == ')')
	    lex_state = EXPR_END;
	else
	    lex_state = EXPR_ENDARG;
	return c;

      case ':':
	c = nextc();
	if (c == ':') {
	    if (IS_BEG() ||
		lex_state == EXPR_CLASS || (IS_ARG() && space_seen)) {
		lex_state = EXPR_BEG;
		return tCOLON3;
	    }
	    lex_state = EXPR_DOT;
	    return tCOLON2;
	}
	if (lex_state == EXPR_END || lex_state == EXPR_ENDARG || (c != -1 && ISSPACE(c))) {
	    pushback(c);
	    lex_state = EXPR_BEG;
	    return ':';
	}
	switch (c) {
	  case '\'':
	    lex_strterm = NEW_STRTERM(str_ssym, c, 0);
	    break;
	  case '"':
	    lex_strterm = NEW_STRTERM(str_dsym, c, 0);
	    break;
	  default:
	    pushback(c);
	    break;
	}
	lex_state = EXPR_FNAME;
	return tSYMBEG;

      case '/':
	if (IS_BEG()) {
	    lex_strterm = NEW_STRTERM(str_regexp, '/', 0);
	    return tREGEXP_BEG;
	}
	if ((c = nextc()) == '=') {
            set_yylval_id('/');
	    lex_state = EXPR_BEG;
	    return tOP_ASGN;
	}
	pushback(c);
	if (IS_ARG() && space_seen) {
	    if (!ISSPACE(c)) {
		arg_ambiguous();
		lex_strterm = NEW_STRTERM(str_regexp, '/', 0);
		return tREGEXP_BEG;
	    }
	}
	switch (lex_state) {
	  case EXPR_FNAME: case EXPR_DOT:
	    lex_state = EXPR_ARG; break;
	  default:
	    lex_state = EXPR_BEG; break;
	}
	return '/';

      case '^':
	if ((c = nextc()) == '=') {
            set_yylval_id('^');
	    lex_state = EXPR_BEG;
	    return tOP_ASGN;
	}
	switch (lex_state) {
	  case EXPR_FNAME: case EXPR_DOT:
	    lex_state = EXPR_ARG; break;
	  default:
	    lex_state = EXPR_BEG; break;
	}
	pushback(c);
	return '^';

      case ';':
	lex_state = EXPR_BEG;
	command_start = Qtrue;
	return ';';

      case ',':
	lex_state = EXPR_BEG;
	return ',';

      case '~':
	if (lex_state == EXPR_FNAME || lex_state == EXPR_DOT) {
	    if ((c = nextc()) != '@') {
		pushback(c);
	    }
	    lex_state = EXPR_ARG;
	}
	else {
	    lex_state = EXPR_BEG;
	}
	return '~';

      case '(':
	if (IS_BEG()) {
	    c = tLPAREN;
	}
	else if (space_seen) {
	    if (IS_ARG()) {
		c = tLPAREN_ARG;
	    }
	}
	paren_nest++;
	COND_PUSH(0);
	CMDARG_PUSH(0);
	lex_state = EXPR_BEG;
	return c;

      case '[':
	paren_nest++;
	if (lex_state == EXPR_FNAME || lex_state == EXPR_DOT) {
	    lex_state = EXPR_ARG;
	    if ((c = nextc()) == ']') {
		if ((c = nextc()) == '=') {
		    return tASET;
		}
		pushback(c);
		return tAREF;
	    }
	    pushback(c);
	    return '[';
	}
	else if (IS_BEG()) {
	    c = tLBRACK;
	}
	else if (IS_ARG() && space_seen) {
	    c = tLBRACK;
	}
	lex_state = EXPR_BEG;
	COND_PUSH(0);
	CMDARG_PUSH(0);
	return c;

      case '{':
	if (lpar_beg && lpar_beg == paren_nest) {
	    lex_state = EXPR_BEG;
	    lpar_beg = 0;
	    --paren_nest;
	    return tLAMBEG;
	}
	if (IS_ARG() || lex_state == EXPR_END)
	    c = '{';          /* block (primary) */
	else if (lex_state == EXPR_ENDARG)
	    c = tLBRACE_ARG;  /* block (expr) */
	else
	    c = tLBRACE;      /* hash */
	COND_PUSH(0);
	CMDARG_PUSH(0);
	lex_state = EXPR_BEG;
	if (c != tLBRACE) command_start = Qtrue;
	return c;

      case '\\':
	c = nextc();
	if (c == '\n') {
	    space_seen = 1;
#ifdef RIPPER
	    ripper_dispatch_scan_event(parser, tSP);
#endif
	    goto retry; /* skip \\n */
	}
	pushback(c);
	return '\\';

      case '%':
	if (IS_BEG()) {
	    int term;
	    int paren;

	    c = nextc();
	  quotation:
	    if (c == -1 || !ISALNUM(c)) {
		term = c;
		c = 'Q';
	    }
	    else {
		term = nextc();
		if (rb_enc_isalnum(term, parser->enc) || !parser_isascii()) {
		    yyerror("unknown type of %string");
		    return 0;
		}
	    }
	    if (c == -1 || term == -1) {
		compile_error(PARSER_ARG "unterminated quoted string meets end of file");
		return 0;
	    }
	    paren = term;
	    if (term == '(') term = ')';
	    else if (term == '[') term = ']';
	    else if (term == '{') term = '}';
	    else if (term == '<') term = '>';
	    else paren = 0;

	    switch (c) {
	      case 'Q':
		lex_strterm = NEW_STRTERM(str_dquote, term, paren);
		return tSTRING_BEG;

	      case 'q':
		lex_strterm = NEW_STRTERM(str_squote, term, paren);
		return tSTRING_BEG;

	      case 'W':
		lex_strterm = NEW_STRTERM(str_dword, term, paren);
		do {c = nextc();} while (ISSPACE(c));
		pushback(c);
		return tWORDS_BEG;

	      case 'w':
		lex_strterm = NEW_STRTERM(str_sword, term, paren);
		do {c = nextc();} while (ISSPACE(c));
		pushback(c);
		return tQWORDS_BEG;

	      case 'x':
		lex_strterm = NEW_STRTERM(str_xquote, term, paren);
		return tXSTRING_BEG;

	      case 'r':
		lex_strterm = NEW_STRTERM(str_regexp, term, paren);
		return tREGEXP_BEG;

	      case 's':
		lex_strterm = NEW_STRTERM(str_ssym, term, paren);
		lex_state = EXPR_FNAME;
		return tSYMBEG;

	      default:
		yyerror("unknown type of %string");
		return 0;
	    }
	}
	if ((c = nextc()) == '=') {
            set_yylval_id('%');
	    lex_state = EXPR_BEG;
	    return tOP_ASGN;
	}
	if (IS_ARG() && space_seen && !ISSPACE(c)) {
	    goto quotation;
	}
	switch (lex_state) {
	  case EXPR_FNAME: case EXPR_DOT:
	    lex_state = EXPR_ARG; break;
	  default:
	    lex_state = EXPR_BEG; break;
	}
	pushback(c);
	return '%';

      case '$':
	last_state = lex_state;
	lex_state = EXPR_END;
	newtok();
	c = nextc();
	switch (c) {
	  case '_':		/* $_: last read line string */
	    c = nextc();
	    if (parser_is_identchar()) {
		tokadd('$');
		tokadd('_');
		break;
	    }
	    pushback(c);
	    c = '_';
	    /* fall through */
	  case '~':		/* $~: match-data */
	  case '*':		/* $*: argv */
	  case '$':		/* $$: pid */
	  case '?':		/* $?: last status */
	  case '!':		/* $!: error string */
	  case '@':		/* $@: error position */
	  case '/':		/* $/: input record separator */
	  case '\\':		/* $\: output record separator */
	  case ';':		/* $;: field separator */
	  case ',':		/* $,: output field separator */
	  case '.':		/* $.: last read line number */
	  case '=':		/* $=: ignorecase */
	  case ':':		/* $:: load path */
	  case '<':		/* $<: reading filename */
	  case '>':		/* $>: default output handle */
	  case '\"':		/* $": already loaded files */
	    tokadd('$');
	    tokadd(c);
	    tokfix();
	    set_yylval_name(rb_intern(tok()));
	    return tGVAR;

	  case '-':
	    tokadd('$');
	    tokadd(c);
	    c = nextc();
	    if (parser_is_identchar()) {
		if (tokadd_mbchar(c) == -1) return 0;
	    }
	    else {
		pushback(c);
	    }
	  gvar:
	    tokfix();
	    set_yylval_name(rb_intern(tok()));
	    return tGVAR;

	  case '&':		/* $&: last match */
	  case '`':		/* $`: string before last match */
	  case '\'':		/* $': string after last match */
	  case '+':		/* $+: string matches last paren. */
	    if (last_state == EXPR_FNAME) {
		tokadd('$');
		tokadd(c);
		goto gvar;
	    }
	    set_yylval_node(NEW_BACK_REF(c));
	    return tBACK_REF;

	  case '1': case '2': case '3':
	  case '4': case '5': case '6':
	  case '7': case '8': case '9':
	    tokadd('$');
	    do {
		tokadd(c);
		c = nextc();
	    } while (c != -1 && ISDIGIT(c));
	    pushback(c);
	    if (last_state == EXPR_FNAME) goto gvar;
	    tokfix();
	    set_yylval_node(NEW_NTH_REF(atoi(tok()+1)));
	    return tNTH_REF;

	  default:
	    if (!parser_is_identchar()) {
		pushback(c);
		return '$';
	    }
	  case '0':
	    tokadd('$');
	}
	break;

      case '@':
	c = nextc();
	newtok();
	tokadd('@');
	if (c == '@') {
	    tokadd('@');
	    c = nextc();
	}
	if (c != -1 && ISDIGIT(c)) {
	    if (tokidx == 1) {
		compile_error(PARSER_ARG "`@%c' is not allowed as an instance variable name", c);
	    }
	    else {
		compile_error(PARSER_ARG "`@@%c' is not allowed as a class variable name", c);
	    }
	    return 0;
	}
	if (!parser_is_identchar()) {
	    pushback(c);
	    return '@';
	}
	break;

      case '_':
	if (was_bol() && whole_match_p("__END__", 7, 0)) {
	    ruby__end__seen = 1;
	    parser->eofp = Qtrue;
#ifndef RIPPER
	    return -1;
#else
            lex_goto_eol(parser);
            ripper_dispatch_scan_event(parser, k__END__);
            return 0;
#endif
	}
	newtok();
	break;

      default:
	if (!parser_is_identchar()) {
	    rb_compile_error(PARSER_ARG  "Invalid char `\\x%02X' in expression", c);
	    goto retry;
	}

	newtok();
	break;
    }

    mb = ENC_CODERANGE_7BIT;
    do {
	if (!ISASCII(c)) mb = ENC_CODERANGE_UNKNOWN;
	if (tokadd_mbchar(c) == -1) return 0;
	c = nextc();
    } while (parser_is_identchar());
    switch (tok()[0]) {
      case '@': case '$':
	pushback(c);
	break;
      default:
	if ((c == '!' || c == '?') && !peek('=')) {
	    tokadd(c);
	}
	else {
	    pushback(c);
	}
    }
    tokfix();

    {
	int result = 0;

	last_state = lex_state;
	switch (tok()[0]) {
	  case '$':
	    lex_state = EXPR_END;
	    result = tGVAR;
	    break;
	  case '@':
	    lex_state = EXPR_END;
	    if (tok()[1] == '@')
		result = tCVAR;
	    else
		result = tIVAR;
	    break;

	  default:
	    if (toklast() == '!' || toklast() == '?') {
		result = tFID;
	    }
	    else {
		if (lex_state == EXPR_FNAME) {
		    if ((c = nextc()) == '=' && !peek('~') && !peek('>') &&
			(!peek('=') || (lex_p + 1 < lex_pend && lex_p[1] == '>'))) {
			result = tIDENTIFIER;
			tokadd(c);
			tokfix();
		    }
		    else {
			pushback(c);
		    }
		}
		if (result == 0 && ISUPPER(tok()[0])) {
		    result = tCONSTANT;
		}
		else {
		    result = tIDENTIFIER;
		}
	    }

	    if ((lex_state == EXPR_BEG && !cmd_state) ||
		lex_state == EXPR_ARG ||
		lex_state == EXPR_CMDARG) {
		if (peek(':') && !(lex_p + 1 < lex_pend && lex_p[1] == ':')) {
		    lex_state = EXPR_BEG;
		    nextc();
		    set_yylval_name(TOK_INTERN(!ENC_SINGLE(mb)));
		    return tLABEL;
		}
	    }
	    if (mb == ENC_CODERANGE_7BIT && lex_state != EXPR_DOT) {
		const struct kwtable *kw;

		/* See if it is a reserved word.  */
		kw = rb_reserved_word(tok(), toklen());
		if (kw) {
		    enum lex_state_e state = lex_state;
		    lex_state = kw->state;
		    if (state == EXPR_FNAME) {
			set_yylval_name(rb_intern(kw->name));
			return kw->id[0];
		    }
		    if (kw->id[0] == keyword_do) {
			command_start = Qtrue;
			if (lpar_beg && lpar_beg == paren_nest) {
			    lpar_beg = 0;
			    --paren_nest;
			    return keyword_do_LAMBDA;
			}
			if (COND_P()) return keyword_do_cond;
			if (CMDARG_P() && state != EXPR_CMDARG)
			    return keyword_do_block;
			if (state == EXPR_ENDARG || state == EXPR_BEG)
			    return keyword_do_block;
			return keyword_do;
		    }
		    if (state == EXPR_BEG || state == EXPR_VALUE)
			return kw->id[0];
		    else {
			if (kw->id[0] != kw->id[1])
			    lex_state = EXPR_BEG;
			return kw->id[1];
		    }
		}
	    }

	    if (IS_BEG() ||
		lex_state == EXPR_DOT ||
		IS_ARG()) {
		if (cmd_state) {
		    lex_state = EXPR_CMDARG;
		}
		else {
		    lex_state = EXPR_ARG;
		}
	    }
	    else {
		lex_state = EXPR_END;
	    }
	}
        {
            ID ident = TOK_INTERN(!ENC_SINGLE(mb));

            set_yylval_name(ident);
            if (last_state != EXPR_DOT && is_local_id(ident) && lvar_defined(ident)) {
                lex_state = EXPR_END;
            }
        }
	return result;
    }
}

#if YYPURE
static int
yylex(void *lval, void *p)
#else
yylex(void *p)
#endif
{
    struct parser_params *parser = (struct parser_params*)p;
    int t;

#if YYPURE
    parser->parser_yylval = lval;
    parser->parser_yylval->val = Qundef;
#endif
    t = parser_yylex(parser);
#ifdef RIPPER
    if (!NIL_P(parser->delayed)) {
	ripper_dispatch_delayed_token(parser, t);
    }
    if (t != 0)
	ripper_dispatch_scan_event(parser, t);
#endif

    return t;
}

#ifndef RIPPER
static NODE*
node_newnode(struct parser_params *parser, enum node_type type, VALUE a0, VALUE a1, VALUE a2)
{
    NODE *n = (rb_node_newnode)(type, a0, a1, a2);
    nd_set_line(n, ruby_sourceline);
    return n;
}

enum node_type
nodetype(NODE *node)			/* for debug */
{
    return (enum node_type)nd_type(node);
}

int
nodeline(NODE *node)
{
    return nd_line(node);
}

static NODE*
newline_node(NODE *node)
{
    if (node) {
	node = remove_begin(node);
	node->flags |= NODE_FL_NEWLINE;
    }
    return node;
}

static void
fixpos(NODE *node, NODE *orig)
{
    if (!node) return;
    if (!orig) return;
    if (orig == (NODE*)1) return;
    nd_set_line(node, nd_line(orig));
}

static void
parser_warning(struct parser_params *parser, NODE *node, const char *mesg)
{
    rb_compile_warning(ruby_sourcefile, nd_line(node), "%s", mesg);
}
#define parser_warning(node, mesg) parser_warning(parser, node, mesg)

static void
parser_warn(struct parser_params *parser, NODE *node, const char *mesg)
{
    rb_compile_warn(ruby_sourcefile, nd_line(node), "%s", mesg);
}
#define parser_warn(node, mesg) parser_warn(parser, node, mesg)

static NODE*
block_append_gen(struct parser_params *parser, NODE *head, NODE *tail)
{
    NODE *end, *h = head, *nd;

    if (tail == 0) return head;

    if (h == 0) return tail;
    switch (nd_type(h)) {
      case NODE_LIT:
      case NODE_STR:
      case NODE_SELF:
      case NODE_TRUE:
      case NODE_FALSE:
      case NODE_NIL:
	parser_warning(h, "unused literal ignored");
	return tail;
      default:
	h = end = NEW_BLOCK(head);
	end->nd_end = end;
	fixpos(end, head);
	head = end;
	break;
      case NODE_BLOCK:
	end = h->nd_end;
	break;
    }

    nd = end->nd_head;
    switch (nd_type(nd)) {
      case NODE_RETURN:
      case NODE_BREAK:
      case NODE_NEXT:
      case NODE_REDO:
      case NODE_RETRY:
	if (RTEST(ruby_verbose)) {
	    parser_warning(nd, "statement not reached");
	}
	break;

      default:
	break;
    }

    if (nd_type(tail) != NODE_BLOCK) {
	tail = NEW_BLOCK(tail);
	tail->nd_end = tail;
    }
    end->nd_next = tail;
    h->nd_end = tail->nd_end;
    return head;
}

/* append item to the list */
static NODE*
list_append_gen(struct parser_params *parser, NODE *list, NODE *item)
{
    NODE *last;

    if (list == 0) return NEW_LIST(item);
    if (list->nd_next) {
	last = list->nd_next->nd_end;
    }
    else {
	last = list;
    }

    list->nd_alen += 1;
    last->nd_next = NEW_LIST(item);
    list->nd_next->nd_end = last->nd_next;
    return list;
}

/* concat two lists */
static NODE*
list_concat_gen(struct parser_params *parser, NODE *head, NODE *tail)
{
    NODE *last;

    if (head->nd_next) {
	last = head->nd_next->nd_end;
    }
    else {
	last = head;
    }

    head->nd_alen += tail->nd_alen;
    last->nd_next = tail;
    if (tail->nd_next) {
	head->nd_next->nd_end = tail->nd_next->nd_end;
    }
    else {
	head->nd_next->nd_end = tail;
    }

    return head;
}

static int
literal_concat0(struct parser_params *parser, VALUE head, VALUE tail)
{
    if (!rb_enc_compatible(head, tail)) {
	compile_error(PARSER_ARG "string literal encodings differ (%s / %s)",
		      rb_enc_name(rb_enc_get(head)),
		      rb_enc_name(rb_enc_get(tail)));
	rb_str_resize(head, 0);
	rb_str_resize(tail, 0);
	return 0;
    }
    rb_str_buf_append(head, tail);
    return 1;
}

/* concat two string literals */
static NODE *
literal_concat_gen(struct parser_params *parser, NODE *head, NODE *tail)
{
    enum node_type htype;

    if (!head) return tail;
    if (!tail) return head;

    htype = nd_type(head);
    if (htype == NODE_EVSTR) {
	NODE *node = NEW_DSTR(STR_NEW0());
	head = list_append(node, head);
    }
    switch (nd_type(tail)) {
      case NODE_STR:
	if (htype == NODE_STR) {
	    if (!literal_concat0(parser, head->nd_lit, tail->nd_lit)) {
	      error:
		rb_gc_force_recycle((VALUE)head);
		rb_gc_force_recycle((VALUE)tail);
		return 0;
	    }
	    rb_gc_force_recycle((VALUE)tail);
	}
	else {
	    list_append(head, tail);
	}
	break;

      case NODE_DSTR:
	if (htype == NODE_STR) {
	    if (!literal_concat0(parser, head->nd_lit, tail->nd_lit))
		goto error;
	    tail->nd_lit = head->nd_lit;
	    rb_gc_force_recycle((VALUE)head);
	    head = tail;
	}
	else if (NIL_P(tail->nd_lit)) {
	    list_concat(head, tail->nd_next);
	    rb_gc_force_recycle((VALUE)tail);
	}
	else {
	    nd_set_type(tail, NODE_ARRAY);
	    tail->nd_head = NEW_STR(tail->nd_lit);
	    list_concat(head, tail);
	}
	break;

      case NODE_EVSTR:
	if (htype == NODE_STR) {
	    nd_set_type(head, NODE_DSTR);
	    head->nd_alen = 1;
	}
	list_append(head, tail);
	break;
    }
    return head;
}

static NODE *
evstr2dstr_gen(struct parser_params *parser, NODE *node)
{
    if (nd_type(node) == NODE_EVSTR) {
	node = list_append(NEW_DSTR(STR_NEW0()), node);
    }
    return node;
}

static NODE *
new_evstr_gen(struct parser_params *parser, NODE *node)
{
    NODE *head = node;

    if (node) {
	switch (nd_type(node)) {
	  case NODE_STR: case NODE_DSTR: case NODE_EVSTR:
	    return node;
	}
    }
    return NEW_EVSTR(head);
}

static NODE *
call_bin_op_gen(struct parser_params *parser, NODE *recv, ID id, NODE *arg1)
{
    value_expr(recv);
    value_expr(arg1);
    return NEW_CALL(recv, id, NEW_LIST(arg1));
}

static NODE *
call_uni_op_gen(struct parser_params *parser, NODE *recv, ID id)
{
    value_expr(recv);
    return NEW_CALL(recv, id, 0);
}

static NODE*
match_op_gen(struct parser_params *parser, NODE *node1, NODE *node2)
{
    value_expr(node1);
    value_expr(node2);
    if (node1) {
	switch (nd_type(node1)) {
	  case NODE_DREGX:
	  case NODE_DREGX_ONCE:
	    return NEW_MATCH2(node1, node2);

	  case NODE_LIT:
	    if (TYPE(node1->nd_lit) == T_REGEXP) {
		return NEW_MATCH2(node1, node2);
	    }
	}
    }

    if (node2) {
	switch (nd_type(node2)) {
	  case NODE_DREGX:
	  case NODE_DREGX_ONCE:
	    return NEW_MATCH3(node2, node1);

	  case NODE_LIT:
	    if (TYPE(node2->nd_lit) == T_REGEXP) {
		return NEW_MATCH3(node2, node1);
	    }
	}
    }

    return NEW_CALL(node1, tMATCH, NEW_LIST(node2));
}

static NODE*
gettable_gen(struct parser_params *parser, ID id)
{
    if (id == keyword_self) {
	return NEW_SELF();
    }
    else if (id == keyword_nil) {
	return NEW_NIL();
    }
    else if (id == keyword_true) {
	return NEW_TRUE();
    }
    else if (id == keyword_false) {
	return NEW_FALSE();
    }
    else if (id == keyword__FILE__) {
	return NEW_STR(rb_external_str_new_with_enc(ruby_sourcefile, strlen(ruby_sourcefile),
						    rb_filesystem_encoding()));
    }
    else if (id == keyword__LINE__) {
	return NEW_LIT(INT2FIX(ruby_sourceline));
    }
    else if (id == keyword__ENCODING__) {
	return NEW_LIT(rb_enc_from_encoding(parser->enc));
    }
    else if (is_local_id(id)) {
	if (dyna_in_block() && dvar_defined(id)) return NEW_DVAR(id);
	if (local_id(id)) return NEW_LVAR(id);
	/* method call without arguments */
	return NEW_VCALL(id);
    }
    else if (is_global_id(id)) {
	return NEW_GVAR(id);
    }
    else if (is_instance_id(id)) {
	return NEW_IVAR(id);
    }
    else if (is_const_id(id)) {
	return NEW_CONST(id);
    }
    else if (is_class_id(id)) {
	return NEW_CVAR(id);
    }
    compile_error(PARSER_ARG "identifier %s is not valid to get", rb_id2name(id));
    return 0;
}
#endif /* !RIPPER */

#ifdef RIPPER
static VALUE
assignable_gen(struct parser_params *parser, VALUE lhs)
#else
static NODE*
assignable_gen(struct parser_params *parser, ID id, NODE *val)
#endif
{
#ifdef RIPPER
    ID id = get_id(lhs);
# define RETURN(x) return get_value(lhs)
# define ERROR(x) dispatch1(assign_error, lhs)
#else
# define RETURN(x) return x
# define ERROR(x) yyerror(x)
#endif
    if (!id) RETURN(0);
    if (id == keyword_self) {
	ERROR("Can't change the value of self");
    }
    else if (id == keyword_nil) {
	ERROR("Can't assign to nil");
    }
    else if (id == keyword_true) {
	ERROR("Can't assign to true");
    }
    else if (id == keyword_false) {
	ERROR("Can't assign to false");
    }
    else if (id == keyword__FILE__) {
	ERROR("Can't assign to __FILE__");
    }
    else if (id == keyword__LINE__) {
	ERROR("Can't assign to __LINE__");
    }
    else if (id == keyword__ENCODING__) {
	ERROR("Can't assign to __ENCODING__");
    }
    else if (is_local_id(id)) {
	if (dyna_in_block()) {
	    if (dvar_curr(id)) {
		RETURN(NEW_DASGN_CURR(id, val));
	    }
	    else if (dvar_defined(id)) {
		RETURN(NEW_DASGN(id, val));
	    }
	    else if (local_id(id)) {
		RETURN(NEW_LASGN(id, val));
	    }
	    else {
		dyna_var(id);
		RETURN(NEW_DASGN_CURR(id, val));
	    }
	}
	else {
	    if (!local_id(id)) {
		local_var(id);
	    }
	    RETURN(NEW_LASGN(id, val));
	}
    }
    else if (is_global_id(id)) {
	RETURN(NEW_GASGN(id, val));
    }
    else if (is_instance_id(id)) {
	RETURN(NEW_IASGN(id, val));
    }
    else if (is_const_id(id)) {
	if (!in_def && !in_single)
	    RETURN(NEW_CDECL(id, val, 0));
	ERROR("dynamic constant assignment");
    }
    else if (is_class_id(id)) {
	RETURN(NEW_CVASGN(id, val));
    }
    else {
	compile_error(PARSER_ARG "identifier %s is not valid to set", rb_id2name(id));
    }
    RETURN(0);
#undef RETURN
#undef ERROR
}

static ID
shadowing_lvar_gen(struct parser_params *parser, ID name)
{
    ID uscore;

    CONST_ID(uscore, "_");
    if (uscore == name) return name;
    if (dyna_in_block()) {
	if (dvar_curr(name)) {
	    yyerror("duplicated argument name");
	}
	else if (dvar_defined(name) || local_id(name)) {
	    rb_warningS("shadowing outer local variable - %s", rb_id2name(name));
	    vtable_add(lvtbl->vars, name);
	}
    }
    else {
	if (local_id(name)) {
	    yyerror("duplicated argument name");
	}
    }
    return name;
}

static void
new_bv_gen(struct parser_params *parser, ID name)
{
    if (!name) return;
    if (!is_local_id(name)) {
	compile_error(PARSER_ARG "invalid local variable - %s",
		      rb_id2name(name));
	return;
    }
    shadowing_lvar(name);
    dyna_var(name);
}

#ifndef RIPPER
static NODE *
aryset_gen(struct parser_params *parser, NODE *recv, NODE *idx)
{
    if (recv && nd_type(recv) == NODE_SELF)
	recv = (NODE *)1;
    return NEW_ATTRASGN(recv, tASET, idx);
}

static void
block_dup_check_gen(struct parser_params *parser, NODE *node1, NODE *node2)
{
    if (node2 && node1 && nd_type(node1) == NODE_BLOCK_PASS) {
	compile_error(PARSER_ARG "both block arg and actual block given");
    }
}

ID
rb_id_attrset(ID id)
{
    id &= ~ID_SCOPE_MASK;
    id |= ID_ATTRSET;
    return id;
}

static NODE *
attrset_gen(struct parser_params *parser, NODE *recv, ID id)
{
    if (recv && nd_type(recv) == NODE_SELF)
	recv = (NODE *)1;
    return NEW_ATTRASGN(recv, rb_id_attrset(id), 0);
}

static void
rb_backref_error_gen(struct parser_params *parser, NODE *node)
{
    switch (nd_type(node)) {
      case NODE_NTH_REF:
	compile_error(PARSER_ARG "Can't set variable $%ld", node->nd_nth);
	break;
      case NODE_BACK_REF:
	compile_error(PARSER_ARG "Can't set variable $%c", (int)node->nd_nth);
	break;
    }
}

static NODE *
arg_concat_gen(struct parser_params *parser, NODE *node1, NODE *node2)
{
    if (!node2) return node1;
    switch (nd_type(node1)) {
      case NODE_BLOCK_PASS:
	node1->nd_iter = arg_concat(node1->nd_iter, node2);
	return node1;
      case NODE_ARGSPUSH:
	if (nd_type(node2) != NODE_ARRAY) break;
	node1->nd_body = list_concat(NEW_LIST(node1->nd_body), node2);
	nd_set_type(node1, NODE_ARGSCAT);
	return node1;
      case NODE_ARGSCAT:
	if (nd_type(node2) != NODE_ARRAY ||
	    nd_type(node1->nd_body) != NODE_ARRAY) break;
	node1->nd_body = list_concat(node1->nd_body, node2);
	return node1;
    }
    return NEW_ARGSCAT(node1, node2);
}

static NODE *
arg_append_gen(struct parser_params *parser, NODE *node1, NODE *node2)
{
    if (!node1) return NEW_LIST(node2);
    switch (nd_type(node1))  {
      case NODE_ARRAY:
	return list_append(node1, node2);
      case NODE_BLOCK_PASS:
	node1->nd_head = arg_append(node1->nd_head, node2);
	return node1;
      case NODE_ARGSPUSH:
	node1->nd_body = list_append(NEW_LIST(node1->nd_body), node2);
	nd_set_type(node1, NODE_ARGSCAT);
	return node1;
    }
    return NEW_ARGSPUSH(node1, node2);
}

static NODE *
splat_array(NODE* node)
{
    if (nd_type(node) == NODE_SPLAT) node = node->nd_head;
    if (nd_type(node) == NODE_ARRAY) return node;
    return 0;
}

static NODE *
node_assign_gen(struct parser_params *parser, NODE *lhs, NODE *rhs)
{
    if (!lhs) return 0;

    switch (nd_type(lhs)) {
      case NODE_GASGN:
      case NODE_IASGN:
      case NODE_IASGN2:
      case NODE_LASGN:
      case NODE_DASGN:
      case NODE_DASGN_CURR:
      case NODE_MASGN:
      case NODE_CDECL:
      case NODE_CVASGN:
	lhs->nd_value = rhs;
	break;

      case NODE_ATTRASGN:
      case NODE_CALL:
	lhs->nd_args = arg_append(lhs->nd_args, rhs);
	break;

      default:
	/* should not happen */
	break;
    }

    return lhs;
}

static int
value_expr_gen(struct parser_params *parser, NODE *node)
{
    int cond = 0;

    if (!node) {
	rb_warning0("empty expression");
    }
    while (node) {
	switch (nd_type(node)) {
	  case NODE_DEFN:
	  case NODE_DEFS:
	    parser_warning(node, "void value expression");
	    return Qfalse;

	  case NODE_RETURN:
	  case NODE_BREAK:
	  case NODE_NEXT:
	  case NODE_REDO:
	  case NODE_RETRY:
	    if (!cond) yyerror("void value expression");
	    /* or "control never reach"? */
	    return Qfalse;

	  case NODE_BLOCK:
	    while (node->nd_next) {
		node = node->nd_next;
	    }
	    node = node->nd_head;
	    break;

	  case NODE_BEGIN:
	    node = node->nd_body;
	    break;

	  case NODE_IF:
	    if (!node->nd_body) {
		node = node->nd_else;
		break;
	    }
	    else if (!node->nd_else) {
		node = node->nd_body;
		break;
	    }
	    if (!value_expr(node->nd_body)) return Qfalse;
	    node = node->nd_else;
	    break;

	  case NODE_AND:
	  case NODE_OR:
	    cond = 1;
	    node = node->nd_2nd;
	    break;

	  default:
	    return Qtrue;
	}
    }

    return Qtrue;
}

static void
void_expr_gen(struct parser_params *parser, NODE *node)
{
    const char *useless = 0;

    if (!RTEST(ruby_verbose)) return;

    if (!node) return;
    switch (nd_type(node)) {
      case NODE_CALL:
	switch (node->nd_mid) {
	  case '+':
	  case '-':
	  case '*':
	  case '/':
	  case '%':
	  case tPOW:
	  case tUPLUS:
	  case tUMINUS:
	  case '|':
	  case '^':
	  case '&':
	  case tCMP:
	  case '>':
	  case tGEQ:
	  case '<':
	  case tLEQ:
	  case tEQ:
	  case tNEQ:
	    useless = rb_id2name(node->nd_mid);
	    break;
	}
	break;

      case NODE_LVAR:
      case NODE_DVAR:
      case NODE_GVAR:
      case NODE_IVAR:
      case NODE_CVAR:
      case NODE_NTH_REF:
      case NODE_BACK_REF:
	useless = "a variable";
	break;
      case NODE_CONST:
	useless = "a constant";
	break;
      case NODE_LIT:
      case NODE_STR:
      case NODE_DSTR:
      case NODE_DREGX:
      case NODE_DREGX_ONCE:
	useless = "a literal";
	break;
      case NODE_COLON2:
      case NODE_COLON3:
	useless = "::";
	break;
      case NODE_DOT2:
	useless = "..";
	break;
      case NODE_DOT3:
	useless = "...";
	break;
      case NODE_SELF:
	useless = "self";
	break;
      case NODE_NIL:
	useless = "nil";
	break;
      case NODE_TRUE:
	useless = "true";
	break;
      case NODE_FALSE:
	useless = "false";
	break;
      case NODE_DEFINED:
	useless = "defined?";
	break;
    }

    if (useless) {
	int line = ruby_sourceline;

	ruby_sourceline = nd_line(node);
	rb_warnS("useless use of %s in void context", useless);
	ruby_sourceline = line;
    }
}

static void
void_stmts_gen(struct parser_params *parser, NODE *node)
{
    if (!RTEST(ruby_verbose)) return;
    if (!node) return;
    if (nd_type(node) != NODE_BLOCK) return;

    for (;;) {
	if (!node->nd_next) return;
	void_expr0(node->nd_head);
	node = node->nd_next;
    }
}

static NODE *
remove_begin(NODE *node)
{
    NODE **n = &node, *n1 = node;
    while (n1 && nd_type(n1) == NODE_BEGIN && n1->nd_body) {
	*n = n1 = n1->nd_body;
    }
    return node;
}

static void
reduce_nodes_gen(struct parser_params *parser, NODE **body)
{
    NODE *node = *body;

    if (!node) {
	*body = NEW_NIL();
	return;
    }
#define subnodes(n1, n2) \
    ((!node->n1) ? (node->n2 ? (body = &node->n2, 1) : 0) : \
     (!node->n2) ? (body = &node->n1, 1) : \
     (reduce_nodes(&node->n1), body = &node->n2, 1))

    while (node) {
	int newline = node->flags & NODE_FL_NEWLINE;
	switch (nd_type(node)) {
	  end:
	  case NODE_NIL:
	    *body = 0;
	    return;
	  case NODE_RETURN:
	    *body = node = node->nd_stts;
	    if (newline && node) node->flags |= NODE_FL_NEWLINE;
	    continue;
	  case NODE_BEGIN:
	    *body = node = node->nd_body;
	    if (newline && node) node->flags |= NODE_FL_NEWLINE;
	    continue;
	  case NODE_BLOCK:
	    body = &node->nd_end->nd_head;
	    break;
	  case NODE_IF:
	    if (subnodes(nd_body, nd_else)) break;
	    return;
	  case NODE_CASE:
	    body = &node->nd_body;
	    break;
	  case NODE_WHEN:
	    if (!subnodes(nd_body, nd_next)) goto end;
	    break;
	  case NODE_ENSURE:
	    if (!subnodes(nd_head, nd_resq)) goto end;
	    break;
	  case NODE_RESCUE:
	    if (!subnodes(nd_head, nd_resq)) goto end;
	    break;
	  default:
	    return;
	}
	node = *body;
	if (newline && node) node->flags |= NODE_FL_NEWLINE;
    }

#undef subnodes
}

static int
assign_in_cond(struct parser_params *parser, NODE *node)
{
    switch (nd_type(node)) {
      case NODE_MASGN:
	yyerror("multiple assignment in conditional");
	return 1;

      case NODE_LASGN:
      case NODE_DASGN:
      case NODE_GASGN:
      case NODE_IASGN:
	break;

      default:
	return 0;
    }

    switch (nd_type(node->nd_value)) {
      case NODE_LIT:
      case NODE_STR:
      case NODE_NIL:
      case NODE_TRUE:
      case NODE_FALSE:
	/* reports always */
	parser_warn(node->nd_value, "found = in conditional, should be ==");
	return 1;

      case NODE_DSTR:
      case NODE_XSTR:
      case NODE_DXSTR:
      case NODE_EVSTR:
      case NODE_DREGX:
      default:
	break;
    }
    return 1;
}

static void
warn_unless_e_option(struct parser_params *parser, NODE *node, const char *str)
{
    if (!e_option_supplied(parser)) parser_warn(node, str);
}

static void
warning_unless_e_option(struct parser_params *parser, NODE *node, const char *str)
{
    if (!e_option_supplied(parser)) parser_warning(node, str);
}

static void
fixup_nodes(NODE **rootnode)
{
    NODE *node, *next, *head;

    for (node = *rootnode; node; node = next) {
	enum node_type type;
	VALUE val;

	next = node->nd_next;
	head = node->nd_head;
	rb_gc_force_recycle((VALUE)node);
	*rootnode = next;
	switch (type = nd_type(head)) {
	  case NODE_DOT2:
	  case NODE_DOT3:
	    val = rb_range_new(head->nd_beg->nd_lit, head->nd_end->nd_lit,
			       type == NODE_DOT3 ? Qtrue : Qfalse);
	    rb_gc_force_recycle((VALUE)head->nd_beg);
	    rb_gc_force_recycle((VALUE)head->nd_end);
	    nd_set_type(head, NODE_LIT);
	    head->nd_lit = val;
	    break;
	  default:
	    break;
	}
    }
}

static NODE *cond0(struct parser_params*,NODE*);

static NODE*
range_op(struct parser_params *parser, NODE *node)
{
    enum node_type type;

    if (node == 0) return 0;

    type = nd_type(node);
    value_expr(node);
    if (type == NODE_LIT && FIXNUM_P(node->nd_lit)) {
	warn_unless_e_option(parser, node, "integer literal in conditional range");
	return NEW_CALL(node, tEQ, NEW_LIST(NEW_GVAR(rb_intern("$."))));
    }
    return cond0(parser, node);
}

static int
literal_node(NODE *node)
{
    if (!node) return 1;	/* same as NODE_NIL */
    switch (nd_type(node)) {
      case NODE_LIT:
      case NODE_STR:
      case NODE_DSTR:
      case NODE_EVSTR:
      case NODE_DREGX:
      case NODE_DREGX_ONCE:
      case NODE_DSYM:
	return 2;
      case NODE_TRUE:
      case NODE_FALSE:
      case NODE_NIL:
	return 1;
    }
    return 0;
}

static NODE*
cond0(struct parser_params *parser, NODE *node)
{
    if (node == 0) return 0;
    assign_in_cond(parser, node);

    switch (nd_type(node)) {
      case NODE_DSTR:
      case NODE_EVSTR:
      case NODE_STR:
	rb_warn0("string literal in condition");
	break;

      case NODE_DREGX:
      case NODE_DREGX_ONCE:
	warning_unless_e_option(parser, node, "regex literal in condition");
	return NEW_MATCH2(node, NEW_GVAR(rb_intern("$_")));

      case NODE_AND:
      case NODE_OR:
	node->nd_1st = cond0(parser, node->nd_1st);
	node->nd_2nd = cond0(parser, node->nd_2nd);
	break;

      case NODE_DOT2:
      case NODE_DOT3:
	node->nd_beg = range_op(parser, node->nd_beg);
	node->nd_end = range_op(parser, node->nd_end);
	if (nd_type(node) == NODE_DOT2) nd_set_type(node,NODE_FLIP2);
	else if (nd_type(node) == NODE_DOT3) nd_set_type(node, NODE_FLIP3);
	if (!e_option_supplied(parser)) {
	    int b = literal_node(node->nd_beg);
	    int e = literal_node(node->nd_end);
	    if ((b == 1 && e == 1) || (b + e >= 2 && RTEST(ruby_verbose))) {
		parser_warn(node, "range literal in condition");
	    }
	}
	break;

      case NODE_DSYM:
	parser_warning(node, "literal in condition");
	break;

      case NODE_LIT:
	if (TYPE(node->nd_lit) == T_REGEXP) {
	    warn_unless_e_option(parser, node, "regex literal in condition");
	    nd_set_type(node, NODE_MATCH);
	}
	else {
	    parser_warning(node, "literal in condition");
	}
      default:
	break;
    }
    return node;
}

static NODE*
cond_gen(struct parser_params *parser, NODE *node)
{
    if (node == 0) return 0;
    return cond0(parser, node);
}

static NODE*
logop_gen(struct parser_params *parser, enum node_type type, NODE *left, NODE *right)
{
    value_expr(left);
    if (left && nd_type(left) == type) {
	NODE *node = left, *second;
	while ((second = node->nd_2nd) != 0 && nd_type(second) == type) {
	    node = second;
	}
	node->nd_2nd = NEW_NODE(type, second, right, 0);
	return left;
    }
    return NEW_NODE(type, left, right, 0);
}

static void
no_blockarg(struct parser_params *parser, NODE *node)
{
    if (node && nd_type(node) == NODE_BLOCK_PASS) {
	compile_error(PARSER_ARG "block argument should not be given");
    }
}

static NODE *
ret_args_gen(struct parser_params *parser, NODE *node)
{
    if (node) {
	no_blockarg(parser, node);
	if (nd_type(node) == NODE_ARRAY) {
	    if (node->nd_next == 0) {
		node = node->nd_head;
	    }
	    else {
		nd_set_type(node, NODE_VALUES);
	    }
	}
    }
    return node;
}

static NODE *
new_yield_gen(struct parser_params *parser, NODE *node)
{
    long state = Qtrue;

    if (node) {
        no_blockarg(parser, node);
	if (node && nd_type(node) == NODE_SPLAT) {
	    state = Qtrue;
	}
    }
    else {
        state = Qfalse;
    }
    return NEW_YIELD(node, state);
}

static NODE*
negate_lit(NODE *node)
{
    switch (TYPE(node->nd_lit)) {
      case T_FIXNUM:
	node->nd_lit = LONG2FIX(-FIX2LONG(node->nd_lit));
	break;
      case T_BIGNUM:
	node->nd_lit = rb_funcall(node->nd_lit,tUMINUS,0,0);
	break;
      case T_FLOAT:
	RFLOAT(node->nd_lit)->float_value = -RFLOAT_VALUE(node->nd_lit);
	break;
      default:
	break;
    }
    return node;
}

static NODE *
arg_blk_pass(NODE *node1, NODE *node2)
{
    if (node2) {
	node2->nd_head = node1;
	return node2;
    }
    return node1;
}

static NODE*
new_args_gen(struct parser_params *parser, NODE *m, NODE *o, ID r, NODE *p, ID b)
{
    int saved_line = ruby_sourceline;
    NODE *node;
    NODE *i1, *i2 = 0;

    node = NEW_ARGS(m ? m->nd_plen : 0, o);
    i1 = m ? m->nd_next : 0;
    node->nd_next = NEW_ARGS_AUX(r, b);

    if (p) {
	i2 = p->nd_next;
	node->nd_next->nd_next = NEW_ARGS_AUX(p->nd_pid, p->nd_plen);
    }
    else if (i1) {
	node->nd_next->nd_next = NEW_ARGS_AUX(0, 0);
    }
    if (i1 || i2) {
	node->nd_next->nd_next->nd_next = NEW_NODE(NODE_AND, i1, i2, 0);
    }
    ruby_sourceline = saved_line;
    return node;
}
#endif /* !RIPPER */

static void
local_push_gen(struct parser_params *parser, int inherit_dvars)
{
    struct local_vars *local;

    local = ALLOC(struct local_vars);
    local->prev = lvtbl;
    local->args = vtable_alloc(0);
    local->vars = vtable_alloc(inherit_dvars ? DVARS_INHERIT : DVARS_TOPSCOPE);
    lvtbl = local;
}

static void
local_pop_gen(struct parser_params *parser)
{
    struct local_vars *local = lvtbl->prev;
    vtable_free(lvtbl->args);
    vtable_free(lvtbl->vars);
    xfree(lvtbl);
    lvtbl = local;
}

#ifndef RIPPER
static ID*
vtable_tblcpy(ID *buf, const struct vtable *src)
{
    int i, cnt = vtable_size(src);

    if (cnt > 0) {
        buf[0] = cnt;
        for (i = 0; i < cnt; i++) {
            buf[i] = src->tbl[i];
        }
        return buf;
    }
    return 0;
}

static ID*
local_tbl_gen(struct parser_params *parser)
{
    int cnt = vtable_size(lvtbl->args) + vtable_size(lvtbl->vars);
    ID *buf;

    if (cnt <= 0) return 0;
    buf = ALLOC_N(ID, cnt + 1);
    vtable_tblcpy(buf+1, lvtbl->args);
    vtable_tblcpy(buf+vtable_size(lvtbl->args)+1, lvtbl->vars);
    buf[0] = cnt;
    return buf;
}
#endif

static int
arg_var_gen(struct parser_params *parser, ID id)
{
    vtable_add(lvtbl->args, id);
    return vtable_size(lvtbl->args) - 1;
}

static int
local_var_gen(struct parser_params *parser, ID id)
{
    vtable_add(lvtbl->vars, id);
    return vtable_size(lvtbl->vars) - 1;
}

static int
local_id_gen(struct parser_params *parser, ID id)
{
    struct vtable *vars, *args;

    vars = lvtbl->vars;
    args = lvtbl->args;

    while (vars && POINTER_P(vars->prev)) {
	vars = vars->prev;
	args = args->prev;
    }

    if (vars && vars->prev == DVARS_INHERIT) {
	return rb_local_defined(id);
    }
    else {
	return (vtable_included(args, id) ||
		vtable_included(vars, id));
    }
}

static const struct vtable *
dyna_push_gen(struct parser_params *parser)
{
    lvtbl->args = vtable_alloc(lvtbl->args);
    lvtbl->vars = vtable_alloc(lvtbl->vars);
    return lvtbl->args;
}

static void
dyna_pop_gen(struct parser_params *parser, const struct vtable *lvargs)
{
    struct vtable *tmp;

    while (lvtbl->args != lvargs) {
	local_pop();
    }
    tmp = lvtbl->args;
    lvtbl->args = lvtbl->args->prev;
    vtable_free(tmp);
    tmp = lvtbl->vars;
    lvtbl->vars = lvtbl->vars->prev;
    vtable_free(tmp);
}

static int
dyna_in_block_gen(struct parser_params *parser)
{
    return POINTER_P(lvtbl->vars) && lvtbl->vars->prev != DVARS_TOPSCOPE;
}

static int
dvar_defined_gen(struct parser_params *parser, ID id)
{
    struct vtable *vars, *args;

    args = lvtbl->args;
    vars = lvtbl->vars;

    while (POINTER_P(vars)) {
	if (vtable_included(args, id)) {
	    return 1;
	}
	if (vtable_included(vars, id)) {
	    return 1;
	}
	args = args->prev;
	vars = vars->prev;
    }

    if (vars == DVARS_INHERIT) {
        return rb_dvar_defined(id);
    }

    return 0;
}

static int
dvar_curr_gen(struct parser_params *parser, ID id)
{
    return (vtable_included(lvtbl->args, id) ||
	    vtable_included(lvtbl->vars, id));
}

#ifndef RIPPER
VALUE rb_reg_compile(VALUE str, int options);
VALUE rb_reg_check_preprocess(VALUE);

static void
reg_fragment_setenc_gen(struct parser_params* parser, VALUE str, int options)
{
    int c = RE_OPTION_ENCODING_IDX(options);

    if (c) {
	int opt, idx;
	rb_char_to_option_kcode(c, &opt, &idx);
	if (idx != ENCODING_GET(str) &&
	    rb_enc_str_coderange(str) != ENC_CODERANGE_7BIT) {
            goto error;
	}
	ENCODING_SET(str, idx);
    }
    else if (RE_OPTION_ENCODING_NONE(options)) {
        if (!ENCODING_IS_ASCII8BIT(str) &&
            rb_enc_str_coderange(str) != ENC_CODERANGE_7BIT) {
            c = 'n';
            goto error;
        }
	rb_enc_associate(str, rb_ascii8bit_encoding());
    }
    else if (parser->enc == rb_usascii_encoding()) {
	if (rb_enc_str_coderange(str) != ENC_CODERANGE_7BIT) {
	    /* raise in re.c */
	    rb_enc_associate(str, rb_usascii_encoding());
	}
	else {
	    rb_enc_associate(str, rb_ascii8bit_encoding());
	}
    }
    return;

  error:
    compile_error(PARSER_ARG
        "regexp encoding option '%c' differs from source encoding '%s'",
        c, rb_enc_name(rb_enc_get(str)));
}

static void
reg_fragment_check_gen(struct parser_params* parser, VALUE str, int options)
{
    VALUE err;
    reg_fragment_setenc_gen(parser, str, options);
    err = rb_reg_check_preprocess(str);
    if (err != Qnil) {
        err = rb_obj_as_string(err);
        compile_error(PARSER_ARG "%s", RSTRING_PTR(err));
	RB_GC_GUARD(err);
    }
}

typedef struct {
    struct parser_params* parser;
    rb_encoding *enc;
    NODE *succ_block;
    NODE *fail_block;
    int num;
} reg_named_capture_assign_t;

int rb_enc_symname2_p(const char *name, int len, rb_encoding *enc);
static int
reg_named_capture_assign_iter(const OnigUChar *name, const OnigUChar *name_end,
          int back_num, int *back_refs, OnigRegex regex, void *arg0)
{
    reg_named_capture_assign_t *arg = (reg_named_capture_assign_t*)arg0;
    struct parser_params* parser = arg->parser;
    rb_encoding *enc = arg->enc;
    int len = name_end - name;
    const char *s = (const char *)name;
    ID var;

    arg->num++;

    if (arg->succ_block == 0) {
        arg->succ_block = NEW_BEGIN(0);
        arg->fail_block = NEW_BEGIN(0);
    }

    if (!len || (*name != '_' && ISASCII(*name) && !rb_enc_islower(*name, enc)) ||
	rb_reserved_word(s, len) || !rb_enc_symname2_p(s, len, enc)) {
        return ST_CONTINUE;
    }
    var = rb_intern3(s, len, enc);
    if (dvar_defined(var) || local_id(var)) {
        rb_warningS("named capture conflicts a local variable - %s",
                    rb_id2name(var));
    }
    arg->succ_block = block_append(arg->succ_block,
        newline_node(node_assign(assignable(var,0),
            NEW_CALL(
              gettable(rb_intern("$~")),
              idAREF,
              NEW_LIST(NEW_LIT(ID2SYM(var))))
            )));
    arg->fail_block = block_append(arg->fail_block,
        newline_node(node_assign(assignable(var,0), NEW_LIT(Qnil))));
    return ST_CONTINUE;
}

static NODE *
reg_named_capture_assign_gen(struct parser_params* parser, VALUE regexp, NODE *match)
{
    reg_named_capture_assign_t arg;

    arg.parser = parser;
    arg.enc = rb_enc_get(regexp);
    arg.succ_block = 0;
    arg.fail_block = 0;
    arg.num = 0;
    onig_foreach_name(RREGEXP(regexp)->ptr, reg_named_capture_assign_iter, (void*)&arg);

    if (arg.num == 0)
        return match;

    return
        block_append(
            newline_node(match),
            NEW_IF(gettable(rb_intern("$~")),
                block_append(
                    newline_node(arg.succ_block),
                    newline_node(
                        NEW_CALL(
                          gettable(rb_intern("$~")),
                          rb_intern("begin"),
                          NEW_LIST(NEW_LIT(INT2FIX(0)))))),
                block_append(
                    newline_node(arg.fail_block),
                    newline_node(
                        NEW_LIT(Qnil)))));
}

static VALUE
reg_compile_gen(struct parser_params* parser, VALUE str, int options)
{
    VALUE re;
    VALUE err;

    reg_fragment_setenc(str, options);
    err = rb_errinfo();
    re = rb_reg_compile(str, options & RE_OPTION_MASK);
    if (NIL_P(re)) {
	ID mesg = rb_intern("mesg");
	VALUE m = rb_attr_get(rb_errinfo(), mesg);
	rb_set_errinfo(err);
	if (!NIL_P(err)) {
	    rb_str_append(rb_str_cat(rb_attr_get(err, mesg), "\n", 1), m);
	}
	else {
	    compile_error(PARSER_ARG "%s", RSTRING_PTR(m));
	}
	return Qnil;
    }
    return re;
}

void
rb_gc_mark_parser(void)
{
}

NODE*
rb_parser_append_print(VALUE vparser, NODE *node)
{
    NODE *prelude = 0;
    NODE *scope = node;
    struct parser_params *parser;

    if (!node) return node;

    Data_Get_Struct(vparser, struct parser_params, parser);

    node = node->nd_body;

    if (nd_type(node) == NODE_PRELUDE) {
	prelude = node;
	node = node->nd_body;
    }

    node = block_append(node,
			NEW_FCALL(rb_intern("print"),
				  NEW_ARRAY(NEW_GVAR(rb_intern("$_")))));
    if (prelude) {
	prelude->nd_body = node;
	scope->nd_body = prelude;
    }
    else {
	scope->nd_body = node;
    }

    return scope;
}

NODE *
rb_parser_while_loop(VALUE vparser, NODE *node, int chop, int split)
{
    NODE *prelude = 0;
    NODE *scope = node;
    struct parser_params *parser;

    if (!node) return node;

    Data_Get_Struct(vparser, struct parser_params, parser);

    node = node->nd_body;

    if (nd_type(node) == NODE_PRELUDE) {
	prelude = node;
	node = node->nd_body;
    }
    if (split) {
	node = block_append(NEW_GASGN(rb_intern("$F"),
				      NEW_CALL(NEW_GVAR(rb_intern("$_")),
					       rb_intern("split"), 0)),
			    node);
    }
    if (chop) {
	node = block_append(NEW_CALL(NEW_GVAR(rb_intern("$_")),
				     rb_intern("chop!"), 0), node);
    }

    node = NEW_OPT_N(node);

    if (prelude) {
	prelude->nd_body = node;
	scope->nd_body = prelude;
    }
    else {
	scope->nd_body = node;
    }

    return scope;
}

static const struct {
    ID token;
    const char *name;
} op_tbl[] = {
    {tDOT2,	".."},
    {tDOT3,	"..."},
    {'+',	"+(binary)"},
    {'-',	"-(binary)"},
    {tPOW,	"**"},
    {tUPLUS,	"+@"},
    {tUMINUS,	"-@"},
    {tCMP,	"<=>"},
    {tGEQ,	">="},
    {tLEQ,	"<="},
    {tEQ,	"=="},
    {tEQQ,	"==="},
    {tNEQ,	"!="},
    {tMATCH,	"=~"},
    {tNMATCH,	"!~"},
    {tAREF,	"[]"},
    {tASET,	"[]="},
    {tLSHFT,	"<<"},
    {tRSHFT,	">>"},
    {tCOLON2,	"::"},
};

#define op_tbl_count (sizeof(op_tbl) / sizeof(op_tbl[0]))

static struct symbols {
    ID last_id;
    st_table *sym_id;
    st_table *id_str;
    st_table *ivar2_id;
    st_table *id_ivar2;
    VALUE op_sym[tLAST_TOKEN];
} global_symbols = {tLAST_ID};

static const struct st_hash_type symhash = {
    rb_str_hash_cmp,
    rb_str_hash,
};

struct ivar2_key {
    ID id;
    VALUE klass;
};

static int
ivar2_cmp(struct ivar2_key *key1, struct ivar2_key *key2)
{
    if (key1->id == key2->id && key1->klass == key2->klass) {
	return 0;
    }
    return 1;
}

static int
ivar2_hash(struct ivar2_key *key)
{
    return (key->id << 8) ^ (key->klass >> 2);
}

static const struct st_hash_type ivar2_hash_type = {
    ivar2_cmp,
    ivar2_hash,
};

void
Init_sym(void)
{
    global_symbols.sym_id = st_init_table_with_size(&symhash, 1000);
    global_symbols.id_str = st_init_numtable_with_size(1000);
    global_symbols.ivar2_id = st_init_table_with_size(&ivar2_hash_type, 1000);
    global_symbols.id_ivar2 = st_init_numtable_with_size(1000);

    Init_id();
}

void
rb_gc_mark_symbols(void)
{
    rb_mark_tbl(global_symbols.id_str);
    rb_gc_mark_locations(global_symbols.op_sym,
			 global_symbols.op_sym + tLAST_TOKEN);
}
#endif /* !RIPPER */

static ID
internal_id_gen(struct parser_params *parser)
{
    ID id = (ID)vtable_size(lvtbl->args) + (ID)vtable_size(lvtbl->vars);
    id += ((tLAST_TOKEN - ID_INTERNAL) >> ID_SCOPE_SHIFT) + 1;
    return ID_INTERNAL | (id << ID_SCOPE_SHIFT);
}

#ifndef RIPPER
static int
is_special_global_name(const char *m, const char *e, rb_encoding *enc)
{
    int mb = 0;

    if (m >= e) return 0;
    switch (*m) {
      case '~': case '*': case '$': case '?': case '!': case '@':
      case '/': case '\\': case ';': case ',': case '.': case '=':
      case ':': case '<': case '>': case '\"':
      case '&': case '`': case '\'': case '+':
      case '0':
	++m;
	break;
      case '-':
	++m;
	if (m < e && is_identchar(m, e, enc)) {
	    if (!ISASCII(*m)) mb = 1;
	    m += rb_enc_mbclen(m, e, enc);
	}
	break;
      default:
	if (!rb_enc_isdigit(*m, enc)) return 0;
	do {
	    if (!ISASCII(*m)) mb = 1;
	    ++m;
	} while (rb_enc_isdigit(*m, enc));
    }
    return m == e ? mb + 1 : 0;
}

int
rb_symname_p(const char *name)
{
    return rb_enc_symname_p(name, rb_ascii8bit_encoding());
}

int
rb_enc_symname_p(const char *name, rb_encoding *enc)
{
    return rb_enc_symname2_p(name, strlen(name), enc);
}

int
rb_enc_symname2_p(const char *name, int len, rb_encoding *enc)
{
    const char *m = name;
    const char *e = m + len;
    int localid = Qfalse;

    if (!m) return Qfalse;
    switch (*m) {
      case '\0':
	return Qfalse;

      case '$':
	if (is_special_global_name(++m, e, enc)) return Qtrue;
	goto id;

      case '@':
	if (*++m == '@') ++m;
	goto id;

      case '<':
	switch (*++m) {
	  case '<': ++m; break;
	  case '=': if (*++m == '>') ++m; break;
	  default: break;
	}
	break;

      case '>':
	switch (*++m) {
	  case '>': case '=': ++m; break;
	}
	break;

      case '=':
	switch (*++m) {
	  case '~': ++m; break;
	  case '=': if (*++m == '=') ++m; break;
	  default: return Qfalse;
	}
	break;

      case '*':
	if (*++m == '*') ++m;
	break;

      case '+': case '-':
	if (*++m == '@') ++m;
	break;

      case '|': case '^': case '&': case '/': case '%': case '~': case '`':
	++m;
	break;

      case '[':
	if (*++m != ']') return Qfalse;
	if (*++m == '=') ++m;
	break;

      case '!':
	switch (*++m) {
	  case '\0': return Qtrue;
	  case '=': case '~': ++m; break;
	  default: return Qfalse;
	}
	break;

      default:
	localid = !rb_enc_isupper(*m, enc);
      id:
	if (m >= e || (*m != '_' && !rb_enc_isalpha(*m, enc) && ISASCII(*m)))
	    return Qfalse;
	while (m < e && is_identchar(m, e, enc)) m += rb_enc_mbclen(m, e, enc);
	if (localid) {
	    switch (*m) {
	      case '!': case '?': case '=': ++m;
	    }
	}
	break;
    }
    return m == e;
}

static ID
register_symid(ID id, const char *name, long len, rb_encoding *enc)
{
    VALUE str = rb_enc_str_new(name, len, enc);
    OBJ_FREEZE(str);
    st_add_direct(global_symbols.sym_id, (st_data_t)str, id);
    st_add_direct(global_symbols.id_str, id, (st_data_t)str);
    return id;
}

ID
rb_intern3(const char *name, long len, rb_encoding *enc)
{
    const char *m = name;
    const char *e = m + len;
    unsigned char c;
    VALUE str;
    ID id;
    int last;
    int mb;
    struct RString fake_str;
    fake_str.basic.flags = T_STRING|RSTRING_NOEMBED|FL_FREEZE;
    fake_str.basic.klass = rb_cString;
    fake_str.as.heap.len = len;
    fake_str.as.heap.ptr = (char *)name;
    fake_str.as.heap.aux.capa = len;
    str = (VALUE)&fake_str;
    rb_enc_associate(str, enc);

    if (st_lookup(global_symbols.sym_id, str, (st_data_t *)&id))
	return id;

    if (rb_cString && !rb_enc_asciicompat(enc)) {
	id = ID_JUNK;
	goto new_id;
    }
    last = len-1;
    id = 0;
    switch (*m) {
      case '$':
	id |= ID_GLOBAL;
	if ((mb = is_special_global_name(++m, e, enc)) != 0) {
	    if (!--mb) enc = rb_ascii8bit_encoding();
	    goto new_id;
	}
	break;
      case '@':
	if (m[1] == '@') {
	    m++;
	    id |= ID_CLASS;
	}
	else {
	    id |= ID_INSTANCE;
	}
	m++;
	break;
      default:
	c = m[0];
	if (c != '_' && rb_enc_isascii(c, enc) && rb_enc_ispunct(c, enc)) {
	    /* operators */
	    int i;

	    if (len == 1) {
		id = c;
		goto id_register;
	    }
	    for (i = 0; i < op_tbl_count; i++) {
		if (*op_tbl[i].name == *m &&
		    strcmp(op_tbl[i].name, m) == 0) {
		    id = op_tbl[i].token;
		    goto id_register;
		}
	    }
	}

	if (m[last] == '=') {
	    /* attribute assignment */
	    id = rb_intern3(name, last, enc);
	    if (id > tLAST_TOKEN && !is_attrset_id(id)) {
		enc = rb_enc_get(rb_id2str(id));
		id = rb_id_attrset(id);
		goto id_register;
	    }
	    id = ID_ATTRSET;
	}
	else if (rb_enc_isupper(m[0], enc)) {
	    id = ID_CONST;
        }
	else {
	    id = ID_LOCAL;
	}
	break;
    }
    mb = 0;
    if (!rb_enc_isdigit(*m, enc)) {
	while (m <= name + last && is_identchar(m, e, enc)) {
	    if (ISASCII(*m)) {
		m++;
	    }
	    else {
		mb = 1;
		m += rb_enc_mbclen(m, e, enc);
	    }
	}
    }
    if (m - name < len) id = ID_JUNK;
    if (enc != rb_usascii_encoding()) {
	/*
	 * this clause makes sense only when called from other than
	 * rb_intern_str() taking care of code-range.
	 */
	if (!mb) {
	    for (; m <= name + len; ++m) {
		if (!ISASCII(*m)) goto mbstr;
	    }
	    enc = rb_usascii_encoding();
	}
      mbstr:;
    }
  new_id:
    if (!(global_symbols.last_id << (ID_SCOPE_SHIFT+RUBY_SPECIAL_SHIFT))) {
	if (len > 20) {
	    rb_raise(rb_eRuntimeError, "symbol table overflow (symbol %.20s...)",
		     name);
	}
	else {
	    rb_raise(rb_eRuntimeError, "symbol table overflow (symbol %.*s)",
		     (int)len, name);
	}
    }
    id |= ++global_symbols.last_id << ID_SCOPE_SHIFT;
  id_register:
    return register_symid(id, name, len, enc);
}

ID
rb_intern2(const char *name, long len)
{
    return rb_intern3(name, len, rb_usascii_encoding());
}

#undef rb_intern
ID
rb_intern(const char *name)
{
    return rb_intern2(name, strlen(name));
}

ID
rb_intern_str(VALUE str)
{
    rb_encoding *enc;
    ID id;

    if (rb_enc_str_coderange(str) == ENC_CODERANGE_7BIT) {
	enc = rb_usascii_encoding();
    }
    else {
	enc = rb_enc_get(str);
    }
    id = rb_intern3(RSTRING_PTR(str), RSTRING_LEN(str), enc);
    RB_GC_GUARD(str);
    return id;
}

VALUE
rb_id2str(ID id)
{
    st_data_t data;

    if (id < tLAST_TOKEN) {
	int i = 0;

	if (rb_ispunct(id)) {
	    VALUE str = global_symbols.op_sym[i = (int)id];
	    if (!str) {
		char name[2];
		name[0] = (char)id;
		name[1] = 0;
		str = rb_usascii_str_new(name, 1);
		OBJ_FREEZE(str);
		global_symbols.op_sym[i] = str;
	    }
	    return str;
	}
	for (i = 0; i < op_tbl_count; i++) {
	    if (op_tbl[i].token == id) {
		VALUE str = global_symbols.op_sym[i];
		if (!str) {
		    str = rb_usascii_str_new2(op_tbl[i].name);
		    OBJ_FREEZE(str);
		    global_symbols.op_sym[i] = str;
		}
		return str;
	    }
	}
    }

    if (st_lookup(global_symbols.id_str, id, &data)) {
        VALUE str = (VALUE)data;
        if (RBASIC(str)->klass == 0)
            RBASIC(str)->klass = rb_cString;
	return str;
    }

    if (is_attrset_id(id)) {
	ID id2 = (id & ~ID_SCOPE_MASK) | ID_LOCAL;
	VALUE str;

	while (!(str = rb_id2str(id2))) {
	    if (!is_local_id(id2)) return 0;
	    id2 = (id & ~ID_SCOPE_MASK) | ID_CONST;
	}
	str = rb_str_dup(str);
	rb_str_cat(str, "=", 1);
	rb_intern_str(str);
	if (st_lookup(global_symbols.id_str, id, &data)) {
            VALUE str = (VALUE)data;
            if (RBASIC(str)->klass == 0)
                RBASIC(str)->klass = rb_cString;
            return str;
        }
    }
    return 0;
}

const char *
rb_id2name(ID id)
{
    VALUE str = rb_id2str(id);

    if (!str) return 0;
    return RSTRING_PTR(str);
}

static int
symbols_i(VALUE sym, ID value, VALUE ary)
{
    rb_ary_push(ary, ID2SYM(value));
    return ST_CONTINUE;
}

/*
 *  call-seq:
 *     Symbol.all_symbols    => array
 *
 *  Returns an array of all the symbols currently in Ruby's symbol
 *  table.
 *
 *     Symbol.all_symbols.size    #=> 903
 *     Symbol.all_symbols[1,20]   #=> [:floor, :ARGV, :Binding, :symlink,
 *                                     :chown, :EOFError, :$;, :String,
 *                                     :LOCK_SH, :"setuid?", :$<,
 *                                     :default_proc, :compact, :extend,
 *                                     :Tms, :getwd, :$=, :ThreadGroup,
 *                                     :wait2, :$>]
 */

VALUE
rb_sym_all_symbols(void)
{
    VALUE ary = rb_ary_new2(global_symbols.sym_id->num_entries);

    st_foreach(global_symbols.sym_id, symbols_i, ary);
    return ary;
}

int
rb_is_const_id(ID id)
{
    if (is_const_id(id)) return Qtrue;
    return Qfalse;
}

int
rb_is_class_id(ID id)
{
    if (is_class_id(id)) return Qtrue;
    return Qfalse;
}

int
rb_is_instance_id(ID id)
{
    if (is_instance_id(id)) return Qtrue;
    return Qfalse;
}

int
rb_is_local_id(ID id)
{
    if (is_local_id(id)) return Qtrue;
    return Qfalse;
}

int
rb_is_junk_id(ID id)
{
    if (is_junk_id(id)) return Qtrue;
    return Qfalse;
}

#endif /* !RIPPER */

static void
parser_initialize(struct parser_params *parser)
{
    parser->eofp = Qfalse;

    parser->parser_lex_strterm = 0;
    parser->parser_cond_stack = 0;
    parser->parser_cmdarg_stack = 0;
    parser->parser_class_nest = 0;
    parser->parser_paren_nest = 0;
    parser->parser_lpar_beg = 0;
    parser->parser_in_single = 0;
    parser->parser_in_def = 0;
    parser->parser_in_defined = 0;
    parser->parser_compile_for_eval = 0;
    parser->parser_cur_mid = 0;
    parser->parser_tokenbuf = NULL;
    parser->parser_tokidx = 0;
    parser->parser_toksiz = 0;
    parser->parser_heredoc_end = 0;
    parser->parser_command_start = Qtrue;
    parser->parser_deferred_nodes = 0;
    parser->parser_lex_pbeg = 0;
    parser->parser_lex_p = 0;
    parser->parser_lex_pend = 0;
    parser->parser_lvtbl = 0;
    parser->parser_ruby__end__seen = 0;
    parser->parser_ruby_sourcefile = 0;
#ifndef RIPPER
    parser->is_ripper = 0;
    parser->parser_eval_tree_begin = 0;
    parser->parser_eval_tree = 0;
#else
    parser->is_ripper = 1;
    parser->parser_ruby_sourcefile_string = Qnil;
    parser->delayed = Qnil;

    parser->result = Qnil;
    parser->parsing_thread = Qnil;
    parser->toplevel_p = Qtrue;
#endif
#ifdef YYMALLOC
    parser->heap = NULL;
#endif
    parser->enc = rb_usascii_encoding();
}

#ifdef RIPPER
#define parser_mark ripper_parser_mark
#define parser_free ripper_parser_free
#endif

static void
parser_mark(void *ptr)
{
    struct parser_params *p = (struct parser_params*)ptr;

    rb_gc_mark((VALUE)p->parser_lex_strterm);
    rb_gc_mark((VALUE)p->parser_deferred_nodes);
    rb_gc_mark(p->parser_lex_input);
    rb_gc_mark(p->parser_lex_lastline);
    rb_gc_mark(p->parser_lex_nextline);
#ifndef RIPPER
    rb_gc_mark((VALUE)p->parser_eval_tree_begin) ;
    rb_gc_mark((VALUE)p->parser_eval_tree) ;
    rb_gc_mark(p->debug_lines);
#else
    rb_gc_mark(p->parser_ruby_sourcefile_string);
    rb_gc_mark(p->delayed);
    rb_gc_mark(p->value);
    rb_gc_mark(p->result);
    rb_gc_mark(p->parsing_thread);
#endif
#ifdef YYMALLOC
    rb_gc_mark((VALUE)p->heap);
#endif
}

static void
parser_free(void *ptr)
{
    struct parser_params *p = (struct parser_params*)ptr;
    struct local_vars *local, *prev;

    if (p->parser_tokenbuf) {
        xfree(p->parser_tokenbuf);
    }
    for (local = p->parser_lvtbl; local; local = prev) {
	if (local->vars) xfree(local->vars);
	prev = local->prev;
	xfree(local);
    }
#ifndef RIPPER
    xfree(p->parser_ruby_sourcefile);
#endif
    xfree(p);
}

VALUE rb_parser_get_yydebug(VALUE);
VALUE rb_parser_set_yydebug(VALUE, VALUE);

#ifndef RIPPER
static struct parser_params *
parser_new(void)
{
    struct parser_params *p;

    p = ALLOC_N(struct parser_params, 1);
    MEMZERO(p, struct parser_params, 1);
    parser_initialize(p);
    return p;
}

VALUE
rb_parser_new(void)
{
    struct parser_params *p = parser_new();

    return Data_Wrap_Struct(0, parser_mark, parser_free, p);
}

/*
 *  call-seq:
 *    ripper#end_seen?   -> Boolean
 *
 *  Return if parsed source ended by +\_\_END\_\_+.
 *  This number starts from 1.
 */
VALUE
rb_parser_end_seen_p(VALUE vparser)
{
    struct parser_params *parser;

    Data_Get_Struct(vparser, struct parser_params, parser);
    return ruby__end__seen ? Qtrue : Qfalse;
}

/*
 *  call-seq:
 *    ripper#encoding   -> encoding
 *
 *  Return encoding of the source.
 */
VALUE
rb_parser_encoding(VALUE vparser)
{
    struct parser_params *parser;

    Data_Get_Struct(vparser, struct parser_params, parser);
    return rb_enc_from_encoding(parser->enc);
}

/*
 *  call-seq:
 *    ripper.yydebug   -> true or false
 *
 *  Get yydebug.
 */
VALUE
rb_parser_get_yydebug(VALUE self)
{
    struct parser_params *parser;

    Data_Get_Struct(self, struct parser_params, parser);
    return yydebug ? Qtrue : Qfalse;
}

/*
 *  call-seq:
 *    ripper.yydebug = flag
 *
 *  Set yydebug.
 */
VALUE
rb_parser_set_yydebug(VALUE self, VALUE flag)
{
    struct parser_params *parser;

    Data_Get_Struct(self, struct parser_params, parser);
    yydebug = RTEST(flag);
    return flag;
}

#ifdef YYMALLOC
#define HEAPCNT(n, size) ((n) * (size) / sizeof(YYSTYPE))
#define NEWHEAP() rb_node_newnode(NODE_ALLOCA, 0, (VALUE)parser->heap, 0)
#define ADD2HEAP(n, c, p) ((parser->heap = (n))->u1.node = (p), \
			   (n)->u3.cnt = (c), (p))

void *
rb_parser_malloc(struct parser_params *parser, size_t size)
{
    size_t cnt = HEAPCNT(1, size);
    NODE *n = NEWHEAP();
    void *ptr = xmalloc(size);

    return ADD2HEAP(n, cnt, ptr);
}

void *
rb_parser_calloc(struct parser_params *parser, size_t nelem, size_t size)
{
    size_t cnt = HEAPCNT(nelem, size);
    NODE *n = NEWHEAP();
    void *ptr = xcalloc(nelem, size);

    return ADD2HEAP(n, cnt, ptr);
}

void *
rb_parser_realloc(struct parser_params *parser, void *ptr, size_t size)
{
    NODE *n;
    size_t cnt = HEAPCNT(1, size);

    if (ptr && (n = parser->heap) != NULL) {
	do {
	    if (n->u1.node == ptr) {
		n->u1.node = ptr = xrealloc(ptr, size);
		if (n->u3.cnt) n->u3.cnt = cnt;
		return ptr;
	    }
	} while ((n = n->u2.node) != NULL);
    }
    n = NEWHEAP();
    ptr = xrealloc(ptr, size);
    return ADD2HEAP(n, cnt, ptr);
}

void
rb_parser_free(struct parser_params *parser, void *ptr)
{
    NODE **prev = &parser->heap, *n;

    while ((n = *prev) != NULL) {
	if (n->u1.node == ptr) {
	    *prev = n->u2.node;
	    rb_gc_force_recycle((VALUE)n);
	    break;
	}
	prev = &n->u2.node;
    }
    xfree(ptr);
}
#endif
#endif

#ifdef RIPPER
#ifdef RIPPER_DEBUG
extern int rb_is_pointer_to_heap(VALUE);

/* :nodoc: */
static VALUE
ripper_validate_object(VALUE self, VALUE x)
{
    if (x == Qfalse) return x;
    if (x == Qtrue) return x;
    if (x == Qnil) return x;
    if (x == Qundef)
        rb_raise(rb_eArgError, "Qundef given");
    if (FIXNUM_P(x)) return x;
    if (SYMBOL_P(x)) return x;
    if (!rb_is_pointer_to_heap(x))
        rb_raise(rb_eArgError, "invalid pointer: %p", x);
    switch (TYPE(x)) {
      case T_STRING:
      case T_OBJECT:
      case T_ARRAY:
      case T_BIGNUM:
      case T_FLOAT:
        return x;
      case T_NODE:
	if (nd_type(x) != NODE_LASGN) {
	    rb_raise(rb_eArgError, "NODE given: %p", x);
	}
	return ((NODE *)x)->nd_rval;
      default:
        rb_raise(rb_eArgError, "wrong type of ruby object: %p (%s)",
                 x, rb_obj_classname(x));
    }
    return x;
}
#endif

#define validate(x) (x = get_value(x))

static VALUE
ripper_dispatch0(struct parser_params *parser, ID mid)
{
    return rb_funcall(parser->value, mid, 0);
}

static VALUE
ripper_dispatch1(struct parser_params *parser, ID mid, VALUE a)
{
    validate(a);
    return rb_funcall(parser->value, mid, 1, a);
}

static VALUE
ripper_dispatch2(struct parser_params *parser, ID mid, VALUE a, VALUE b)
{
    validate(a);
    validate(b);
    return rb_funcall(parser->value, mid, 2, a, b);
}

static VALUE
ripper_dispatch3(struct parser_params *parser, ID mid, VALUE a, VALUE b, VALUE c)
{
    validate(a);
    validate(b);
    validate(c);
    return rb_funcall(parser->value, mid, 3, a, b, c);
}

static VALUE
ripper_dispatch4(struct parser_params *parser, ID mid, VALUE a, VALUE b, VALUE c, VALUE d)
{
    validate(a);
    validate(b);
    validate(c);
    validate(d);
    return rb_funcall(parser->value, mid, 4, a, b, c, d);
}

static VALUE
ripper_dispatch5(struct parser_params *parser, ID mid, VALUE a, VALUE b, VALUE c, VALUE d, VALUE e)
{
    validate(a);
    validate(b);
    validate(c);
    validate(d);
    validate(e);
    return rb_funcall(parser->value, mid, 5, a, b, c, d, e);
}

static const struct kw_assoc {
    ID id;
    const char *name;
} keyword_to_name[] = {
    {keyword_class,	"class"},
    {keyword_module,	"module"},
    {keyword_def,	"def"},
    {keyword_undef,	"undef"},
    {keyword_begin,	"begin"},
    {keyword_rescue,	"rescue"},
    {keyword_ensure,	"ensure"},
    {keyword_end,	"end"},
    {keyword_if,	"if"},
    {keyword_unless,	"unless"},
    {keyword_then,	"then"},
    {keyword_elsif,	"elsif"},
    {keyword_else,	"else"},
    {keyword_case,	"case"},
    {keyword_when,	"when"},
    {keyword_while,	"while"},
    {keyword_until,	"until"},
    {keyword_for,	"for"},
    {keyword_break,	"break"},
    {keyword_next,	"next"},
    {keyword_redo,	"redo"},
    {keyword_retry,	"retry"},
    {keyword_in,	"in"},
    {keyword_do,	"do"},
    {keyword_do_cond,	"do"},
    {keyword_do_block,	"do"},
    {keyword_return,	"return"},
    {keyword_yield,	"yield"},
    {keyword_super,	"super"},
    {keyword_self,	"self"},
    {keyword_nil,	"nil"},
    {keyword_true,	"true"},
    {keyword_false,	"false"},
    {keyword_and,	"and"},
    {keyword_or,	"or"},
    {keyword_not,	"not"},
    {modifier_if,	"if"},
    {modifier_unless,	"unless"},
    {modifier_while,	"while"},
    {modifier_until,	"until"},
    {modifier_rescue,	"rescue"},
    {keyword_alias,	"alias"},
    {keyword_defined,	"defined?"},
    {keyword_BEGIN,	"BEGIN"},
    {keyword_END,	"END"},
    {keyword__LINE__,	"__LINE__"},
    {keyword__FILE__,	"__FILE__"},
    {keyword__ENCODING__, "__ENCODING__"},
    {0, NULL}
};

static const char*
keyword_id_to_str(ID id)
{
    const struct kw_assoc *a;

    for (a = keyword_to_name; a->id; a++) {
        if (a->id == id)
            return a->name;
    }
    return NULL;
}

#undef ripper_id2sym
static VALUE
ripper_id2sym(ID id)
{
    const char *name;
    char buf[8];

    if (id <= 256) {
        buf[0] = id;
        buf[1] = '\0';
        return ID2SYM(rb_intern(buf));
    }
    if ((name = keyword_id_to_str(id))) {
        return ID2SYM(rb_intern(name));
    }
    switch (id) {
      case tOROP:
        name = "||";
        break;
      case tANDOP:
        name = "&&";
        break;
      default:
        name = rb_id2name(id);
        if (!name) {
            rb_bug("cannot convert ID to string: %ld", (unsigned long)id);
        }
        break;
    }
    return ID2SYM(rb_intern(name));
}

static VALUE
ripper_intern(const char *s)
{
    return ID2SYM(rb_intern(s));
}

static ID
ripper_get_id(VALUE v)
{
    NODE *nd;
    if (TYPE(v) != T_NODE) return 0;
    nd = (NODE *)v;
    if (nd_type(nd) != NODE_LASGN) return 0;
    return nd->nd_vid;
}

static VALUE
ripper_get_value(VALUE v)
{
    NODE *nd;
    if (TYPE(v) != T_NODE) return v;
    nd = (NODE *)v;
    if (nd_type(nd) != NODE_LASGN) return Qnil;
    return nd->nd_rval;
}

static void
ripper_compile_error(struct parser_params *parser, const char *fmt, ...)
{
    VALUE str;
    va_list args;

    va_start(args, fmt);
    str = rb_vsprintf(fmt, args);
    va_end(args);
    rb_funcall(parser->value, rb_intern("compile_error"), 1, str);
}

static void
ripper_warn0(struct parser_params *parser, const char *fmt)
{
    rb_funcall(parser->value, rb_intern("warn"), 1, STR_NEW2(fmt));
}

static void
ripper_warnI(struct parser_params *parser, const char *fmt, int a)
{
    rb_funcall(parser->value, rb_intern("warn"), 2,
               STR_NEW2(fmt), INT2NUM(a));
}

#if 0
static void
ripper_warnS(struct parser_params *parser, const char *fmt, const char *str)
{
    rb_funcall(parser->value, rb_intern("warn"), 2,
               STR_NEW2(fmt), STR_NEW2(str));
}
#endif

static void
ripper_warning0(struct parser_params *parser, const char *fmt)
{
    rb_funcall(parser->value, rb_intern("warning"), 1, STR_NEW2(fmt));
}

static void
ripper_warningS(struct parser_params *parser, const char *fmt, const char *str)
{
    rb_funcall(parser->value, rb_intern("warning"), 2,
               STR_NEW2(fmt), STR_NEW2(str));
}

static VALUE
ripper_lex_get_generic(struct parser_params *parser, VALUE src)
{
    return rb_funcall(src, ripper_id_gets, 0);
}

static VALUE
ripper_s_allocate(VALUE klass)
{
    struct parser_params *p;
    VALUE self;

    p = ALLOC_N(struct parser_params, 1);
    MEMZERO(p, struct parser_params, 1);
    self = Data_Wrap_Struct(klass, parser_mark, parser_free, p);
    p->value = self;
    return self;
}

#define ripper_initialized_p(r) ((r)->parser_lex_input != 0)

/*
 *  call-seq:
 *    Ripper.new(src, filename="(ripper)", lineno=1) -> ripper
 *
 *  Create a new Ripper object.
 *  _src_ must be a String, an IO, or an Object which has #gets method.
 *
 *  This method does not starts parsing.
 *  See also Ripper#parse and Ripper.parse.
 */
static VALUE
ripper_initialize(int argc, VALUE *argv, VALUE self)
{
    struct parser_params *parser;
    VALUE src, fname, lineno;

    Data_Get_Struct(self, struct parser_params, parser);
    rb_scan_args(argc, argv, "12", &src, &fname, &lineno);
    if (rb_obj_respond_to(src, ripper_id_gets, 0)) {
        parser->parser_lex_gets = ripper_lex_get_generic;
    }
    else {
        StringValue(src);
        parser->parser_lex_gets = lex_get_str;
    }
    parser->parser_lex_input = src;
    parser->eofp = Qfalse;
    if (NIL_P(fname)) {
        fname = STR_NEW2("(ripper)");
    }
    else {
        StringValue(fname);
    }
    parser_initialize(parser);

    parser->parser_ruby_sourcefile_string = fname;
    parser->parser_ruby_sourcefile = RSTRING_PTR(fname);
    parser->parser_ruby_sourceline = NIL_P(lineno) ? 0 : NUM2INT(lineno) - 1;

    return Qnil;
}

extern VALUE rb_thread_pass(void);

struct ripper_args {
    struct parser_params *parser;
    int argc;
    VALUE *argv;
};

static VALUE
ripper_parse0(VALUE parser_v)
{
    struct parser_params *parser;

    Data_Get_Struct(parser_v, struct parser_params, parser);
    parser_prepare(parser);
    ripper_yyparse((void*)parser);
    return parser->result;
}

static VALUE
ripper_ensure(VALUE parser_v)
{
    struct parser_params *parser;

    Data_Get_Struct(parser_v, struct parser_params, parser);
    parser->parsing_thread = Qnil;
    return Qnil;
}

/*
 *  call-seq:
 *    ripper#parse
 *
 *  Start parsing and returns the value of the root action.
 */
static VALUE
ripper_parse(VALUE self)
{
    struct parser_params *parser;

    Data_Get_Struct(self, struct parser_params, parser);
    if (!ripper_initialized_p(parser)) {
        rb_raise(rb_eArgError, "method called for uninitialized object");
    }
    if (!NIL_P(parser->parsing_thread)) {
        if (parser->parsing_thread == rb_thread_current())
            rb_raise(rb_eArgError, "Ripper#parse is not reentrant");
        else
            rb_raise(rb_eArgError, "Ripper#parse is not multithread-safe");
    }
    parser->parsing_thread = rb_thread_current();
    rb_ensure(ripper_parse0, self, ripper_ensure, self);

    return parser->result;
}

/*
 *  call-seq:
 *    ripper#column   -> Integer
 *
 *  Return column number of current parsing line.
 *  This number starts from 0.
 */
static VALUE
ripper_column(VALUE self)
{
    struct parser_params *parser;
    long col;

    Data_Get_Struct(self, struct parser_params, parser);
    if (!ripper_initialized_p(parser)) {
        rb_raise(rb_eArgError, "method called for uninitialized object");
    }
    if (NIL_P(parser->parsing_thread)) return Qnil;
    col = parser->tokp - parser->parser_lex_pbeg;
    return LONG2NUM(col);
}

/*
 *  call-seq:
 *    ripper#lineno   -> Integer
 *
 *  Return line number of current parsing line.
 *  This number starts from 1.
 */
static VALUE
ripper_lineno(VALUE self)
{
    struct parser_params *parser;

    Data_Get_Struct(self, struct parser_params, parser);
    if (!ripper_initialized_p(parser)) {
        rb_raise(rb_eArgError, "method called for uninitialized object");
    }
    if (NIL_P(parser->parsing_thread)) return Qnil;
    return INT2NUM(parser->parser_ruby_sourceline);
}

#ifdef RIPPER_DEBUG
/* :nodoc: */
static VALUE
ripper_assert_Qundef(VALUE self, VALUE obj, VALUE msg)
{
    StringValue(msg);
    if (obj == Qundef) {
        rb_raise(rb_eArgError, "%s", RSTRING_PTR(msg));
    }
    return Qnil;
}

/* :nodoc: */
static VALUE
ripper_value(VALUE self, VALUE obj)
{
    return ULONG2NUM(obj);
}
#endif

void
Init_ripper(void)
{
    VALUE Ripper;

    Ripper = rb_define_class("Ripper", rb_cObject);
    rb_define_const(Ripper, "Version", rb_usascii_str_new2(RIPPER_VERSION));
    rb_define_alloc_func(Ripper, ripper_s_allocate);
    rb_define_method(Ripper, "initialize", ripper_initialize, -1);
    rb_define_method(Ripper, "parse", ripper_parse, 0);
    rb_define_method(Ripper, "column", ripper_column, 0);
    rb_define_method(Ripper, "lineno", ripper_lineno, 0);
    rb_define_method(Ripper, "end_seen?", rb_parser_end_seen_p, 0);
    rb_define_method(Ripper, "encoding", rb_parser_encoding, 0);
    rb_define_method(Ripper, "yydebug", rb_parser_get_yydebug, 0);
    rb_define_method(Ripper, "yydebug=", rb_parser_set_yydebug, 1);
#ifdef RIPPER_DEBUG
    rb_define_method(rb_mKernel, "assert_Qundef", ripper_assert_Qundef, 2);
    rb_define_method(rb_mKernel, "rawVALUE", ripper_value, 1);
    rb_define_method(rb_mKernel, "validate_object", ripper_validate_object, 1);
#endif

    ripper_id_gets = rb_intern("gets");
    ripper_init_eventids1(Ripper);
    ripper_init_eventids2(Ripper);
    /* ensure existing in symbol table */
    rb_intern("||");
    rb_intern("&&");
}
#endif /* RIPPER */
