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(); }