mjs-sys 0.1.2

Rust mJS Bindings
Documentation 
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/*
 * Copyright (c) 2016 Cesanta Software Limited
 * All rights reserved
 */

#include "mjs_conversion.h"
#include "mjs_object.h"
#include "mjs_primitive.h"
#include "mjs_string.h"
#include "mjs_util.h"

MJS_PRIVATE mjs_err_t mjs_to_string(struct mjs *mjs, mjs_val_t *v, char **p,
                                    size_t *sizep, int *need_free) {
  mjs_err_t ret = MJS_OK;

  *p = NULL;
  *sizep = 0;
  *need_free = 0;

  if (mjs_is_string(*v)) {
    *p = (char *) mjs_get_string(mjs, v, sizep);
  } else if (mjs_is_number(*v)) {
    char buf[50] = "";
    struct json_out out = JSON_OUT_BUF(buf, sizeof(buf));
    mjs_jprintf(*v, mjs, &out);
    *sizep = strlen(buf);
    *p = malloc(*sizep + 1);
    if (*p == NULL) {
      ret = MJS_OUT_OF_MEMORY;
      goto clean;
    }
    memmove(*p, buf, *sizep + 1);
    *need_free = 1;
  } else if (mjs_is_boolean(*v)) {
    if (mjs_get_bool(mjs, *v)) {
      *p = "true";
      *sizep = 4;
    } else {
      *p = "false";
      *sizep = 5;
    }
  } else if (mjs_is_undefined(*v)) {
    *p = "undefined";
    *sizep = 9;
  } else if (mjs_is_null(*v)) {
    *p = "null";
    *sizep = 4;
  } else if (mjs_is_object(*v)) {
    ret = MJS_TYPE_ERROR;
    mjs_set_errorf(mjs, ret,
                   "conversion from object to string is not supported");
  } else if (mjs_is_foreign(*v)) {
    *p = "TODO_foreign";
    *sizep = 12;
  } else {
    ret = MJS_TYPE_ERROR;
    mjs_set_errorf(mjs, ret, "unknown type to convert to string");
  }

clean:
  return ret;
}

MJS_PRIVATE mjs_val_t mjs_to_boolean_v(struct mjs *mjs, mjs_val_t v) {
  size_t len;
  int is_truthy;

  is_truthy =
      ((mjs_is_boolean(v) && mjs_get_bool(mjs, v)) ||
       (mjs_is_number(v) && mjs_get_double(mjs, v) != 0.0) ||
       (mjs_is_string(v) && mjs_get_string(mjs, &v, &len) && len > 0) ||
       (mjs_is_function(v)) || (mjs_is_foreign(v)) || (mjs_is_object(v))) &&
      v != MJS_TAG_NAN;

  return mjs_mk_boolean(mjs, is_truthy);
}

MJS_PRIVATE int mjs_is_truthy(struct mjs *mjs, mjs_val_t v) {
  return mjs_get_bool(mjs, mjs_to_boolean_v(mjs, v));
}