function advagg_drupal_to_js in Advanced CSS/JS Aggregation 6

Same name and namespace in other branches

1. 7 advagg.module \advagg_drupal_to_js()

Converts a PHP variable into its Javascript equivalent.

We use HTML-safe strings, i.e. with <, > and & escaped.

1 string reference to 'advagg_drupal_to_js'

advagg_process_js in ./advagg.module

Returns a themed presentation of all JavaScript code for the current page.

File

./advagg.module, line 3127

Advanced CSS/JS aggregation module

Code

function advagg_drupal_to_js($var) {

  // Different versions of PHP handle json_encode() differently.
  static $php550;
  static $php530;
  if (!isset($php550)) {
    $php550 = version_compare(PHP_VERSION, '5.5.0', '>=');
  }
  if (!isset($php530)) {
    $php530 = version_compare(PHP_VERSION, '5.3.0', '>=');
  }

  // json_encode on PHP prior to PHP 5.3.0 doesn't support options.
  if ($php530) {

    // Default json encode options.
    $options = JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_AMP | JSON_HEX_QUOT;
    if ($php550) {

      // Output partial json if PHP >= 5.5.0.
      $options |= JSON_PARTIAL_OUTPUT_ON_ERROR;
    }

    // Encode to JSON.
    return @json_encode($var, $options);
  }

  // if json_encode exists, use it.
  if (function_exists('json_encode')) {
    return str_replace(array(
      "<",
      ">",
      "&",
    ), array(
      '\\u003c',
      '\\u003e',
      '\\u0026',
    ), json_encode($var));
  }
  switch (gettype($var)) {
    case 'boolean':
      return $var ? 'true' : 'false';

    // Lowercase necessary!
    case 'integer':
    case 'double':
      return $var;
    case 'resource':
    case 'string':

      // Always use Unicode escape sequences (\u0022) over JSON escape
      // sequences (\") to prevent browsers interpreting these as
      // special characters.
      $replace_pairs = array(
        // ", \ and U+0000 - U+001F must be escaped according to RFC 4627.
        '\\' => '\\u005C',
        '"' => '\\u0022',
        "\0" => '\\u0000',
        "\1" => '\\u0001',
        "\2" => '\\u0002',
        "\3" => '\\u0003',
        "\4" => '\\u0004',
        "\5" => '\\u0005',
        "\6" => '\\u0006',
        "\7" => '\\u0007',
        "\10" => '\\u0008',
        "\t" => '\\u0009',
        "\n" => '\\u000A',
        "\v" => '\\u000B',
        "\f" => '\\u000C',
        "\r" => '\\u000D',
        "\16" => '\\u000E',
        "\17" => '\\u000F',
        "\20" => '\\u0010',
        "\21" => '\\u0011',
        "\22" => '\\u0012',
        "\23" => '\\u0013',
        "\24" => '\\u0014',
        "\25" => '\\u0015',
        "\26" => '\\u0016',
        "\27" => '\\u0017',
        "\30" => '\\u0018',
        "\31" => '\\u0019',
        "\32" => '\\u001A',
        "\33" => '\\u001B',
        "\34" => '\\u001C',
        "\35" => '\\u001D',
        "\36" => '\\u001E',
        "\37" => '\\u001F',
        // Prevent browsers from interpreting these as as special.
        "'" => '\\u0027',
        '<' => '\\u003C',
        '>' => '\\u003E',
        '&' => '\\u0026',
        // Prevent browsers from interpreting the solidus as special and
        // non-compliant JSON parsers from interpreting // as a comment.
        '/' => '\\u002F',
        // While these are allowed unescaped according to ECMA-262, section
        // 15.12.2, they cause problems in some JSON parsers.
        "
" => '\\u2028',
        // U+2028, Line Separator.
        "
" => '\\u2029',
      );
      return '"' . strtr($var, $replace_pairs) . '"';
    case 'array':

      // Arrays in JSON can't be associative. If the array is empty or if it
      // has sequential whole number keys starting with 0, it's not associative
      // so we can go ahead and convert it as an array.
      if (empty($var) || array_keys($var) === range(0, sizeof($var) - 1)) {
        $output = array();
        foreach ($var as $v) {
          $output[] = advagg_drupal_to_js($v);
        }
        return '[ ' . implode(', ', $output) . ' ]';
      }

    // Otherwise, fall through to convert the array as an object.
    case 'object':
      $output = array();
      foreach ($var as $k => $v) {
        $output[] = advagg_drupal_to_js(strval($k)) . ': ' . advagg_drupal_to_js($v);
      }
      return '{ ' . implode(', ', $output) . ' }';
    default:
      return 'null';
  }
}