function Diff::check

Check a Diff for validity.

This is here only for debugging purposes.

File

core/lib/Drupal/Component/Diff/Diff.php, line 135

Class

Diff

Class representing a 'diff' between two sequences of strings. @todo document @subpackage DifferenceEngine

Namespace

Code

public function check($from_lines, $to_lines) {
    if (serialize($from_lines) != serialize($this->orig())) {
        trigger_error("Reconstructed original doesn't match", E_USER_ERROR);
    }
    if (serialize($to_lines) != serialize($this->closing())) {
        trigger_error("Reconstructed closing doesn't match", E_USER_ERROR);
    }
    $rev = $this->reverse();
    if (serialize($to_lines) != serialize($rev->orig())) {
        trigger_error("Reversed original doesn't match", E_USER_ERROR);
    }
    if (serialize($from_lines) != serialize($rev->closing())) {
        trigger_error("Reversed closing doesn't match", E_USER_ERROR);
    }
    $prevtype = 'none';
    foreach ($this->edits as $edit) {
        if ($prevtype == $edit->type) {
            trigger_error("Edit sequence is non-optimal", E_USER_ERROR);
        }
        $prevtype = $edit->type;
    }
    $lcs = $this->lcs();
    trigger_error('Diff okay: LCS = ' . $lcs, E_USER_NOTICE);
}