protected function EasyRdf_Parser_Turtle::parseNumber

Parses a numeric value, either of type integer, decimal or double @ignore

File

drupal/core/vendor/easyrdf/easyrdf/lib/EasyRdf/Parser/Turtle.php, line 685

Class

EasyRdf_Parser_Turtle

Class to parse Turtle with no external dependancies.

Code

protected function parseNumber() {
  $value = '';
  $datatype = EasyRdf_Namespace::get('xsd') . 'integer';
  $c = $this
    ->read();

  // read optional sign character
  if ($c == '+' || $c == '-') {
    $value .= $c;
    $c = $this
      ->read();
  }
  while (ctype_digit($c)) {
    $value .= $c;
    $c = $this
      ->read();
  }
  if ($c == '.' || $c == 'e' || $c == 'E') {

    // We're parsing a decimal or a double
    $datatype = EasyRdf_Namespace::get('xsd') . 'decimal';

    // read optional fractional digits
    if ($c == '.') {
      $value .= $c;
      $c = $this
        ->read();
      while (ctype_digit($c)) {
        $value .= $c;
        $c = $this
          ->read();
      }
      if (strlen($value) == 1) {

        // We've only parsed a '.'
        throw new EasyRdf_Exception("Turtle Parse Error: object for statement missing");
      }
    }
    else {
      if (strlen($value) == 0) {

        // We've only parsed an 'e' or 'E'
        throw new EasyRdf_Exception("Turtle Parse Error: object for statement missing");
      }
    }

    // read optional exponent
    if ($c == 'e' || $c == 'E') {
      $datatype = EasyRdf_Namespace::get('xsd') . 'double';
      $value .= $c;
      $c = $this
        ->read();
      if ($c == '+' || $c == '-') {
        $value .= $c;
        $c = $this
          ->read();
      }
      if (!ctype_digit($c)) {
        throw new EasyRdf_Exception("Turtle Parse Error: Exponent value missing");
      }
      $value .= $c;
      $c = $this
        ->read();
      while (ctype_digit($c)) {
        $value .= $c;
        $c = $this
          ->read();
      }
    }
  }

  // Unread last character, it isn't part of the number
  $this
    ->unread($c);

  // Return result as a typed literal
  return array(
    'type' => 'literal',
    'value' => $value,
    'datatype' => $datatype,
  );
}