function qformat_qti2::indent_xhtml in Quiz 6.6

Same name and namespace in other branches

1. 6.5 includes/moodle/question/format/qti2/format.php \qformat_qti2::indent_xhtml()

File

includes/moodle/question/format/qti2/format.php, line 25

Class

qformat_qti2

Code

function indent_xhtml($source, $indenter = ' ') {

  // xml tidier-upper
  // (c) Ari Koivula http://ventionline.com
  // Remove all pre-existing formatting.
  // Remove all newlines.
  $source = str_replace("\n", '', $source);
  $source = str_replace("\r", '', $source);

  // Remove all tabs.
  $source = str_replace("\t", '', $source);

  // Remove all space after ">" and before "<".
  $source = ereg_replace(">( )*", ">", $source);
  $source = ereg_replace("( )*<", "<", $source);

  // Iterate through the source.
  $level = 0;
  $source_len = strlen($source);
  $pt = 0;
  while ($pt < $source_len) {
    if ($source[$pt] === '<') {

      // We have entered a tag.
      // Remember the point where the tag starts.
      $started_at = $pt;
      $tag_level = 1;

      // If the second letter of the tag is "/", assume its an ending tag.
      if ($source[$pt + 1] === '/') {
        $tag_level = -1;
      }

      // If the second letter of the tag is "!", assume its an "invisible" tag.
      if ($source[$pt + 1] === '!') {
        $tag_level = 0;
      }

      // Iterate throught the source until the end of tag.
      while ($source[$pt] !== '>') {
        $pt++;
      }

      // If the second last letter is "/", assume its a self ending tag.
      if ($source[$pt - 1] === '/') {
        $tag_level = 0;
      }
      $tag_lenght = $pt + 1 - $started_at;

      // Decide the level of indention for this tag.
      // If this was an ending tag, decrease indent level for this tag..
      if ($tag_level === -1) {
        $level--;
      }

      // Place the tag in an array with proper indention.
      $array[] = str_repeat($indenter, $level) . substr($source, $started_at, $tag_lenght);

      // If this was a starting tag, increase the indent level after this tag.
      if ($tag_level === 1) {
        $level++;
      }

      // if it was a self closing tag, dont do anything.
    }

    // Were out of the tag.
    // If next letter exists...
    if ($pt + 1 < $source_len) {

      // ... and its not an "<".
      if ($source[$pt + 1] !== '<') {
        $started_at = $pt + 1;

        // Iterate through the source until the start of new tag or until we reach the end of file.
        while ($source[$pt] !== '<' && $pt < $source_len) {
          $pt++;
        }

        // If we found a "<" (we didnt find the end of file)
        if ($source[$pt] === '<') {
          $tag_lenght = $pt - $started_at;

          // Place the stuff in an array with proper indention.
          $array[] = str_repeat($indenter, $level) . substr($source, $started_at, $tag_lenght);
        }

        // If the next tag is "<", just advance pointer and let the tag indenter take care of it.
      }
      else {
        $pt++;
      }

      // If the next letter doesnt exist... Were done... well, almost..
    }
    else {
      break;
    }
  }

  // Replace old source with the new one we just collected into our array.
  $source = implode($array, "\n");
  return $source;
}