gh-166: Make REPLACE reject empty old.

python-processing-unit · python-processing-unit · commit 15da30152818 · 2026-05-08T17:31:43.000-04:00
diff --git a/src/builtins.c b/src/builtins.c
@@ -5691,7 +5691,7 @@ static Value builtin_replace(Interpreter* interp, Value* args, int argc, Expr**
     size_t haystack_len = strlen(haystack);
     
     if (needle_len == 0) {
-        return value_str(haystack);
+        RUNTIME_ERROR(interp, "REPLACE expects non-empty old substring", line, col);
     }
     
     // Count occurrences

Original file line number	Diff line number	Diff line change
`@@ -5691,7 +5691,7 @@ static Value builtin_replace(Interpreter* interp, Value* args, int argc, Expr**`
`5691`	`5691`	`size_t haystack_len = strlen(haystack);`
`5692`	`5692`
`5693`	`5693`	`if (needle_len == 0) {`
`5694`		`- return value_str(haystack);`
	`5694`	`+ RUNTIME_ERROR(interp, "REPLACE expects non-empty old substring", line, col);`
`5695`	`5695`	`}`
`5696`	`5696`
`5697`	`5697`	`// Count occurrences`