Module: JsonScanner

Defined in:
lib/json_scanner.rb,
lib/json_scanner/version.rb,
ext/json_scanner/json_scanner.c

Defined Under Namespace

Classes: Error, ParseError

Constant Summary collapse

VERSION = 
"0.2.0"
ANY_INDEX = 
rb_range_new(INT2FIX(0), INT2FIX(-1), false)

Class Method Summary collapse

Class Method Details

.scan(*args) ⇒ Object

allow_comments, dont_validate_strings, allow_trailing_garbage, allow_multiple_values, allow_partial_values



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# File 'ext/json_scanner/json_scanner.c', line 492

VALUE scan(int argc, VALUE *argv, VALUE self)
{
  VALUE json_str, path_ary, with_path_flag, kwargs;
  VALUE kwargs_values[7];

  int with_path = false, verbose_error = false;
  char *json_text;
  size_t json_text_len;
  yajl_handle handle;
  yajl_status stat;
  scan_ctx *ctx;
  VALUE err = Qnil, result;
  // Turned out callbacks can't raise exceptions
  // VALUE callback_err;
#if RUBY_API_VERSION_MAJOR > 2 || (RUBY_API_VERSION_MAJOR == 2 && RUBY_API_VERSION_MINOR >= 7)
  rb_scan_args_kw(RB_SCAN_ARGS_LAST_HASH_KEYWORDS, argc, argv, "21:", &json_str, &path_ary, &with_path_flag, &kwargs);
#else
  rb_scan_args(argc, argv, "21:", &json_str, &path_ary, &with_path_flag, &kwargs);
#endif
  // rb_io_write(rb_stderr, rb_sprintf("with_path_flag: %" PRIsVALUE " \n", with_path_flag));
  with_path = RTEST(with_path_flag);
  if (kwargs != Qnil)
  {
    rb_get_kwargs(kwargs, scan_kwargs_table, 0, 7, kwargs_values);
    if (kwargs_values[0] != Qundef)
      with_path = RTEST(kwargs_values[0]);
    if (kwargs_values[1] != Qundef)
      verbose_error = RTEST(kwargs_values[1]);
  }
  rb_check_type(json_str, T_STRING);
  json_text = RSTRING_PTR(json_str);
#if LONG_MAX > SIZE_MAX
  json_text_len = RSTRING_LENINT(json_str);
#else
  json_text_len = RSTRING_LEN(json_str);
#endif
  ctx = scan_ctx_init(path_ary, with_path);

  handle = yajl_alloc(&scan_callbacks, NULL, (void *)ctx);
  if (kwargs != Qnil) // it's safe to read kwargs_values only if rb_get_kwargs was called
  {
    if (kwargs_values[2] != Qundef)
      yajl_config(handle, yajl_allow_comments, RTEST(kwargs_values[2]));
    if (kwargs_values[3] != Qundef)
      yajl_config(handle, yajl_dont_validate_strings, RTEST(kwargs_values[3]));
    if (kwargs_values[4] != Qundef)
      yajl_config(handle, yajl_allow_trailing_garbage, RTEST(kwargs_values[4]));
    if (kwargs_values[5] != Qundef)
      yajl_config(handle, yajl_allow_multiple_values, RTEST(kwargs_values[5]));
    if (kwargs_values[6] != Qundef)
      yajl_config(handle, yajl_allow_partial_values, RTEST(kwargs_values[6]));
  }
  ctx->handle = handle;
  stat = yajl_parse(handle, (unsigned char *)json_text, json_text_len);
  if (stat == yajl_status_ok)
    stat = yajl_complete_parse(handle);

  if (stat != yajl_status_ok)
  {
    char *str = (char *)yajl_get_error(handle, verbose_error, (unsigned char *)json_text, json_text_len);
    err = rb_utf8_str_new_cstr(str);
    yajl_free_error(handle, (unsigned char *)str);
  }
  // callback_err = ctx->rb_err;
  result = ctx->points_list;
  scan_ctx_free(ctx);
  yajl_free(handle);
  if (err != Qnil)
    rb_exc_raise(rb_exc_new_str(rb_eJsonScannerParseError, err));
  // if (callback_err != Qnil)
  //   rb_exc_raise(callback_err);
  // TODO: report yajl_get_bytes_consumed(handle)
  return result;
}