function DrupalDiffInline::render

Render differences inline using HTML markup.

File

drupal/core/lib/Drupal/Component/Diff/DiffEngine.php, line 1244

A PHP diff engine for phpwiki. (Taken from phpwiki-1.3.3)

Class

DrupalDiffInline

Drupal inline Diff formatter. @private @subpackage DifferenceEngine

Code

function render() {
  $a = preg_split('/(<[^>]+?>| )/', $this->a, -1, PREG_SPLIT_DELIM_CAPTURE);
  $b = preg_split('/(<[^>]+?>| )/', $this->b, -1, PREG_SPLIT_DELIM_CAPTURE);
  $diff = new Diff($a, $b);
  $diff->edits = $this
    ->process_edits($diff->edits);

  // Assemble highlighted output
  $output = '';
  foreach ($diff->edits as $chunk) {
    switch ($chunk->type) {
      case 'copy':
        $output .= implode('', $chunk->closing);
        break;
      case 'delete':
        foreach ($chunk->orig as $i => $piece) {
          if (strpos($piece, '<') === 0 && drupal_substr($piece, drupal_strlen($piece) - 1) === '>') {
            $output .= $piece;
          }
          else {
            $output .= theme('diff_inline_chunk', array(
              'text' => $piece,
              'type' => $chunk->type,
            ));
          }
        }
        break;
      default:
        $chunk->closing = $this
          ->process_chunk($chunk->closing);
        foreach ($chunk->closing as $i => $piece) {
          if ($piece === ' ' || strpos($piece, '<') === 0 && drupal_substr($piece, drupal_strlen($piece) - 1) === '>' && drupal_strtolower(drupal_substr($piece, 1, 3)) != 'img') {
            $output .= $piece;
          }
          else {
            $output .= theme('diff_inline_chunk', array(
              'text' => $piece,
              'type' => $chunk->type,
            ));
          }
        }
        break;
    }
  }
  return $output;
}