From e5849386d9d6c026e6ca9b7fb353b8e66688adc1 Mon Sep 17 00:00:00 2001
From: "B. Watson" <urchlay@slackware.uk>
Date: Wed, 10 Jul 2024 04:57:12 -0400
Subject: whichbas: detect string concatenation with comma (BXL/BXE,
 assignments only).

---
 whichbas.c | 47 +++++++++++++++++++++++++++--------------------
 1 file changed, 27 insertions(+), 20 deletions(-)

diff --git a/whichbas.c b/whichbas.c
index 586fd0b..0aeb5d1 100644
--- a/whichbas.c
+++ b/whichbas.c
@@ -249,17 +249,27 @@ int is_string_func(unsigned char tok) {
 /* return true if a token is:
    - a string constant,
    - a string variable,
-   - a string expression operator, like OP_STR_LE,
    - a function that returns a string.
 */
-int is_string_op(unsigned char tok) {
+int is_string_rval(unsigned char tok) {
 	return
 		is_string_const  (tok) ||
 		is_string_func   (tok) ||
-		is_string_exp_op (tok) ||
 		is_string_var    (tok) ;
 }
 
+/* return true if a token is:
+   - a string constant,
+   - a string variable,
+   - a string expression operator, like OP_STR_LE,
+   - a function that returns a string.
+*/
+int is_string_op(unsigned char tok) {
+	return
+		is_string_rval   (tok) ||
+		is_string_exp_op (tok) ;
+}
+
 void remove_type(int type) {
 	bas_type &= ((~type) & 0x0f);
 
@@ -629,6 +639,18 @@ CALLBACK(handle_op) {
 		}
 	}
 
+	/* BXL/BXE allows string concatenation in assignment with the comma,
+	   A$="FOO","BAR" or A$=C$,D$. */
+	if(last_cmd == CMD_LET || last_cmd == CMD_ILET) {
+		if(program[last_cmd_pos + 2] == OP_STR_ASSIGN) {
+			if(tok == OP_COMMA) {
+				if(is_string_rval(nexttok)) {
+					remove_type(BT_ATARI | BT_TURBO);
+				}
+			}
+		}
+	}
+
 	if(tok == OP_HEXCONST) remove_type(BT_ATARI); /* hex const (turbo *and* bxl/xe) */
 	if(tok <= OP_FUNC_STRIG) {
 		if(verbose) fprintf(stderr, "   bas_type now %02x\n", bas_type);
@@ -715,27 +737,12 @@ CALLBACK(handle_op) {
 			break;
 
 		case 0x5c: /* DEC (function, takes str) in TB, HEX$ (function, takes num) in BXL/BXE */
-			if(is_string_op(nexttok2)) {
+			/* COMPLETE */
+			if(is_string_rval(nexttok2)) {
 				remove_type(BT_BXL_BXE);
 			} else if(is_numeric_op(nexttok2)) {
 				remove_type(BT_TURBO);
 			}
-
-			/* old implementation: */
-			/* PARTIAL: won't catch HEX$(ASC("A")) (or any other nested function call) */
-			/*
-			if(nexttok2 == OP_STRCONST) {
-				remove_type(BT_BXL_BXE);
-			} else if(nexttok2 == OP_NUMCONST) {
-				remove_type(BT_TURBO);
-			} else if(nexttok2 >= 0x80) {
-				if(get_vartype(nexttok2) == TYPE_STRING) {
-					remove_type(BT_BXL_BXE);
-				} else {
-					remove_type(BT_TURBO);
-				}
-			}
-			*/
 			break;
 
 		case 0x5e: /* FRAC (num func, 1 arg) or DPEEK (num func, 1 arg) in BXL...
-- 
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