get_bool.c

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/*
 * This file is part of the Fun programming language.
 * https://fun-lang.xyz/
 *
 * Copyright 2025 Johannes Findeisen <you@hanez.org>
 * Licensed under the terms of the Apache-2.0 license.
 * https://opensource.org/license/apache-2-0
 */
 
/**
 * @file get_bool.c
 * @brief VM opcode snippet for reading a boolean from an INI dictionary (OP_INI_GET_BOOL).
 *
 * Included by vm.c when FUN_WITH_INI is enabled.
 *
 * Opcode: OP_INI_GET_BOOL
 * Stack: [default:int|bool] [key:string] [section:string] [handle:int] -> [out:int]
 *
 * Behavior
 * - Pops default value (0/1), key, section, and handle.
 * - Looks up the entry "section:key" in the referenced dictionary. If not found,
 *   also tries a dotted variant "section.key" for compatibility.
 * - Accepts textual booleans (true/false, yes/no, on/off; case-insensitive) and
 *   numeric values (non-zero => true). Falls back to the provided default when
 *   parsing fails or entry is missing.
 * - Pushes 1 for true or 0 for false.
 *
 * Errors
 * - Invalid handle or arguments simply yield the default value; no exception.
 */
 
/* OP_INI_GET_BOOL */
#ifdef FUN_WITH_INI
case OP_INI_GET_BOOL: {
  Value vdef = pop_value(vm);
  Value vkey = pop_value(vm);
  Value vsec = pop_value(vm);
  Value vh = pop_value(vm);
  int def = (vdef.type == VAL_INT || vdef.type == VAL_BOOL) ? (int)vdef.i : 0;
  const char *key = (vkey.type == VAL_STRING) ? vkey.s : NULL;
  const char *sec = (vsec.type == VAL_STRING) ? vsec.s : NULL;
  int h = (vh.type == VAL_INT) ? (int)vh.i : 0;
  dictionary *d = ini_get(h);
  int outb = def;
  if (d && sec && key) {
    char full[1024];
    char alt[1024];
    ini_make_full_key(full, sizeof(full), sec, key);
    memcpy(alt, full, sizeof(alt));
    for (size_t i = 0; i < sizeof(alt) && alt[i]; ++i) {
      if (alt[i] == ':') {
        alt[i] = '.';
        break;
      }
    }
    const char *s = iniparser_getstring(d, full, NULL);
    if (!s) s = iniparser_getstring(d, alt, NULL);
    if (s) {
      /* normalize and parse boolean */
      char buf[256];
      size_t n = strlen(s);
      if (n >= 2 && ((s[0] == '"' && s[n - 1] == '"') || (s[0] == '\'' && s[n - 1] == '\''))) {
        size_t copy = (n - 2) < sizeof(buf) - 1 ? (n - 2) : sizeof(buf) - 1;
        memcpy(buf, s + 1, copy);
        buf[copy] = '\0';
        s = buf;
      }
      /* trim spaces */
      while (*s && (unsigned char)*s <= ' ')
        s++;
      /* lower copy for textual booleans */
      char lb[256];
      size_t li = 0;
      for (; s[li] && li < sizeof(lb) - 1; ++li)
        lb[li] = (char)tolower((unsigned char)s[li]);
      lb[li] = '\0';
      if (strcmp(lb, "true") == 0 || strcmp(lb, "yes") == 0 || strcmp(lb, "on") == 0) {
        outb = 1;
      } else if (strcmp(lb, "false") == 0 || strcmp(lb, "no") == 0 || strcmp(lb, "off") == 0) {
        outb = 0;
      } else {
        /* numeric */
        char *endp = NULL;
        long v = strtol(lb, &endp, 10);
        outb = (endp && endp != lb) ? (v != 0) : def;
      }
    } else {
      outb = def;
    }
  }
  free_value(vdef);
  free_value(vkey);
  free_value(vsec);
  free_value(vh);
  push_value(vm, make_int(outb ? 1 : 0));
  break;
}
#endif