From f5cb0cc786ca73197a17b56782c5595ff813f570 Mon Sep 17 00:00:00 2001
From: "B. Watson" <urchlay@slackware.uk>
Date: Thu, 18 Jul 2024 04:15:08 -0400
Subject: listbas: indentation WIP: A+ and BXE seem complete (need more
 testing) and BXL is almost there.

---
 listbas.c | 46 ++++++++++++++++++++++++++++++++++++----------
 1 file changed, 36 insertions(+), 10 deletions(-)

(limited to 'listbas.c')

diff --git a/listbas.c b/listbas.c
index b3ef069..dc267c8 100644
--- a/listbas.c
+++ b/listbas.c
@@ -92,10 +92,11 @@ int color_varnames  = NO_COLOR;
 
 const char *input_filename;
 
-int indent_level = 0;
-int badtok =       0; /* set to 1 if we find a bad token */
-int inv =          0; /* set to 1 when we're printing inverse */
-int cur_color =   -1; /* -1 = no color */
+int indent_level =    0;
+int if_without_then = 0;
+int badtok =          0; /* set to 1 if we find a bad token */
+int inv =             0; /* set to 1 when we're printing inverse */
+int cur_color =      -1; /* -1 = no color */
 
 int first_stmt = 1; /* true if cmd token comes right after lineno */
 
@@ -530,15 +531,15 @@ block are not indented, only the lines between them.
 
 void print_indent(void) {
 	int i;
-	if(indent_level < 0) indent_level = 1;
+	if(indent_level < 0) indent_level = 0;
 	for(i = 0; i < indent_level; i++) {
 		outchr(' ');
 		outchr(' ');
 	}
 }
 
-/* TODO: IF without THEN: IF A:stmt */
 void aplus_indent_line(const unsigned char tok) {
+	if(if_without_then) indent_level++;
 	if(first_stmt) print_indent();
 
 	switch(tok) {
@@ -548,6 +549,7 @@ void aplus_indent_line(const unsigned char tok) {
 			return;
 		case 0x08: /* NEXT */
 		case 0x14: /* ENDWHILE */
+		case 0x18: /* ENDIF */
 			indent_level--;
 			return;
 		default: break;
@@ -557,9 +559,13 @@ void aplus_indent_line(const unsigned char tok) {
 void turbo_indent_line(const unsigned char tok) {
 }
 
-/* TODO: IF without THEN: IF A */
-/* TODO: extended subtokens (PROCEDURE!) */
-void bxl_indent_line(const unsigned char tok) {
+/* TODO: IF without THEN: the actual IF line is supposed to get indented,
+   but only if there's *not* a THEN. no easy way to look ahead that I've
+   thought of yet. */
+/* Note: BXL's PROCEDURE/EXIT (from toolkit extensions) does
+   *not* get indented. */
+void bxl_indent_line(unsigned char tok) {
+	if(if_without_then) indent_level++;
 	switch(tok) {
 		case CMD_FOR: /* FOR */
 		case 0x38:    /* WHILE */
@@ -567,6 +573,7 @@ void bxl_indent_line(const unsigned char tok) {
 			break;
 		case CMD_NEXT: /* NEXT */
 		case 0x39:     /* ENDWHILE */
+		case 0x3d:     /* ENDIF */
 			if(first_stmt) print_indent();
 			indent_level--;
 			return;
@@ -575,9 +582,16 @@ void bxl_indent_line(const unsigned char tok) {
 	if(first_stmt) print_indent();
 }
 
-/* TODO: IF without THEN: IF A */
 void bxe_indent_line(const unsigned char tok) {
+	if(if_without_then) indent_level++;
 	switch(tok) {
+		case 0x3c:    /* ELSE */
+			if(first_stmt) {
+				indent_level--;
+				print_indent();
+				indent_level++;
+			}
+			return;
 		case CMD_FOR: /* FOR */
 		case 0x38:    /* WHILE */
 		case 0x59:    /* PROCEDURE */
@@ -587,6 +601,7 @@ void bxe_indent_line(const unsigned char tok) {
 		case CMD_NEXT: /* NEXT */
 		case 0x39:     /* ENDWHILE */
 		case 0x5e:     /* EXIT */
+		case 0x3d:     /* ENDIF */
 			indent_level--;
 			break;
 		default: break;
@@ -597,6 +612,9 @@ void bxe_indent_line(const unsigned char tok) {
 void indent_line(const unsigned char tok) {
 	if(!indent) return;
 
+	/*
+	fprintf(stderr, "if_without_then == %d\n", if_without_then);
+	*/
 	switch(bas_type) {
 		case B_APLUS: aplus_indent_line(tok); return;
 		case B_TURBO: turbo_indent_line(tok); return;
@@ -615,10 +633,13 @@ CALLBACK(print_cmd) {
 	if(first_stmt)
 		first_stmt = 0;
 
+	if_without_then = 0;
 	if(bas_type == B_APLUS) {
 		if(tok == 0x52) return;
+		if(tok == 0x06) if_without_then = 1;
 	} else {
 		if(tok == CMD_ILET) return;
+		if(tok == CMD_IF) if_without_then = 1;
 	}
 
 	if(color) color_on(color_cmd);
@@ -763,6 +784,11 @@ void print_varname(unsigned char varnum) {
 CALLBACK(print_op) {
 	const char *name;
 
+	if(tok == OP_THEN) {
+		/* same token in A+ as in all the others, for once. */
+		if_without_then = 0;
+	}
+
 	switch(tok) {
 		case 0: /* Turbo variables numbered >= $80 */
 			if(bas_type == B_TURBO) {
-- 
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