class WordLevelDiff

backdrop_class_list in includes/bootstrap.classes.inc

Lists all the classes used by Backdrop core.

class WordLevelDiff extends MappedDiff {
  const MAX_LINE_LENGTH = 10000;

  /**
   * @param $orig_lines
   * @param $closing_lines
   */
  function __construct($orig_lines, $closing_lines) {
    list($orig_words, $orig_stripped) = $this->split($orig_lines);
    list($closing_words, $closing_stripped) = $this->split($closing_lines);

    parent::__construct($orig_words, $closing_words, $orig_stripped, $closing_stripped);
  }

  /**
   * @param $lines
   *
   * @return array
   */
  private function split($lines) {
    $words = array();
    $stripped = array();
    $first = TRUE;
    foreach ($lines as $line) {
      # If the line is too long, just pretend the entire line is one big word
      # This prevents resource exhaustion problems
      if ($first) {
        $first = FALSE;
      }
      else {
        $words[] = "\n";
        $stripped[] = "\n";
      }
      if (strlen($line) > self::MAX_LINE_LENGTH) {
        $words[] = $line;
        $stripped[] = $line;
      }
      else {
        $m = array();
        if (preg_match_all('/ ( [^\S\n]+ | [0-9_A-Za-z\x80-\xff]+ | . ) (?: (?!< \n) [^\S\n])? /xs', 
        $line, $m)
        ) {
          foreach ($m[0] as $word) {
            $words[] = $word;
          }
          foreach ($m[1] as $stripped_word) {
            $stripped[] = $stripped_word;
          }
        }
      }
    }
    return array($words, $stripped);
  }

  /**
   * @return array
   */
  public function orig() {
    $orig = new HWLDFWordAccumulator;

    foreach ($this->edits as $edit) {
      if ($edit->type == 'copy') {
        $orig->addWords($edit->orig);
      }
      elseif ($edit->orig) {
        $orig->addWords($edit->orig, 'del');
      }
    }
    $lines = $orig->getLines();
    return $lines;
  }

  /**
   * @return array
   */
  public function closing() {
    $closing = new HWLDFWordAccumulator;

    foreach ($this->edits as $edit) {
      if ($edit->type == 'copy') {
        $closing->addWords($edit->closing);
      }
      elseif ($edit->closing) {
        $closing->addWords($edit->closing, 'ins');
      }
    }
    $lines = $closing->getLines();
    return $lines;
  }
}