get_double.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_double.c
 * @brief VM opcode snippet for reading a floating-point value from INI (OP_INI_GET_DOUBLE).
 *
 * Opcode: OP_INI_GET_DOUBLE
 * Stack: [default:float|int] [key:string] [section:string] [handle:int] -> [out:float]
 *
 * Behavior
 * - Pops default, key, section, and handle; looks up "section:key" (and
 *   dotted fallback) and attempts to parse as double using strtod().
 * - If lookup or parsing fails, pushes the provided default.
 *
 * Errors
 * - Invalid handle/args simply produce the default; no exception raised.
 */
 
/* OP_INI_GET_DOUBLE */
#ifdef FUN_WITH_INI
case OP_INI_GET_DOUBLE: {
  Value vdef = pop_value(vm);
  Value vkey = pop_value(vm);
  Value vsec = pop_value(vm);
  Value vh = pop_value(vm);
  double def = (vdef.type == VAL_FLOAT) ? vdef.d : (vdef.type == VAL_INT ? (double)vdef.i : 0.0);
  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);
  double outd = 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) {
      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;
      }
      while (*s && (unsigned char)*s <= ' ')
        s++;
      char *endp = NULL;
      double v = strtod(s, &endp);
      if (endp && endp != s)
        outd = v;
      else
        outd = def;
    } else {
      outd = def;
    }
  }
  free_value(vdef);
  free_value(vkey);
  free_value(vsec);
  free_value(vh);
  push_value(vm, make_float(outd));
  break;
}
#endif