PHP Diff::setChanges方法代码示例

 public function testLevenshtein()
 {
     // Levenshtein with trailing equality.
     $this->d->setChanges(array(array(Diff::DELETE, "abc"), array(Diff::INSERT, "1234"), array(Diff::EQUAL, "xyz")));
     $this->assertEquals(4, $this->d->levenshtein());
     // Levenshtein with leading equality.
     $this->d->setChanges(array(array(Diff::EQUAL, "xyz"), array(Diff::DELETE, "abc"), array(Diff::INSERT, "1234")));
     $this->assertEquals(4, $this->d->levenshtein());
     // Levenshtein with middle equality.
     $this->d->setChanges(array(array(Diff::DELETE, "abc"), array(Diff::EQUAL, "xyz"), array(Diff::INSERT, "1234")));
     $this->assertEquals(7, $this->d->levenshtein());
 }

 /**
  * Do a quick line-level diff on both strings, then rediff the parts for greater accuracy.
  * This speedup can produce non-minimal diffs.
  *
  * @param string $text1    Old string to be diffed.
  * @param string $text2    New string to be diffed.
  * @param int    $deadline Time when the diff should be complete by.
  *
  * @return array Array of changes.
  */
 protected function lineMode($text1, $text2, $deadline)
 {
     // Scan the text on a line-by-line basis first.
     list($text1, $text2, $lineArray) = $this->getToolkit()->linesToChars($text1, $text2);
     $diff = new Diff();
     $diff->main($text1, $text2, false, $deadline);
     $diffs = $diff->getChanges();
     // Convert the diff back to original text.
     $this->getToolkit()->charsToLines($diffs, $lineArray);
     $diff->setChanges($diffs);
     // Eliminate freak matches (e.g. blank lines)
     $diff->cleanupSemantic();
     $diffs = $diff->getChanges();
     // Rediff any replacement blocks, this time character-by-character.
     // Add a dummy entry at the end.
     array_push($diffs, array(self::EQUAL, ''));
     $pointer = 0;
     $countDelete = 0;
     $countInsert = 0;
     $textDelete = '';
     $textInsert = '';
     while ($pointer < count($diffs)) {
         switch ($diffs[$pointer][0]) {
             case self::DELETE:
                 $countDelete++;
                 $textDelete .= $diffs[$pointer][1];
                 break;
             case self::INSERT:
                 $countInsert++;
                 $textInsert .= $diffs[$pointer][1];
                 break;
             case self::EQUAL:
                 // Upon reaching an equality, check for prior redundancies.
                 if ($countDelete > 0 && $countInsert > 0) {
                     // Delete the offending records and add the merged ones.
                     $subDiff = new Diff();
                     $subDiff->main($textDelete, $textInsert, false, $deadline);
                     array_splice($diffs, $pointer - $countDelete - $countInsert, $countDelete + $countInsert, $subDiff->getChanges());
                     $pointer = $pointer - $countDelete - $countInsert + count($subDiff->getChanges());
                 }
                 $countDelete = 0;
                 $countInsert = 0;
                 $textDelete = '';
                 $textInsert = '';
                 break;
         }
         $pointer++;
     }
     // Remove the dummy entry at the end.
     array_pop($diffs);
     return $diffs;
 }

 /**
  * Convert a diff array into a pretty HTML report.
  *
  * @param array $diffs Array of diff arrays.
  *
  * @return string HTML representation.
  */
 public function diff_prettyHtml($diffs)
 {
     $this->diff->setChanges($diffs);
     return $this->diff->prettyHtml();
 }