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506
wp/wp-includes/Text/Diff.php
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506
wp/wp-includes/Text/Diff.php
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<?php
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/**
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* General API for generating and formatting diffs - the differences between
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* two sequences of strings.
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*
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* The original PHP version of this code was written by Geoffrey T. Dairiki
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* <dairiki@dairiki.org>, and is used/adapted with his permission.
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*
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* Copyright 2004 Geoffrey T. Dairiki <dairiki@dairiki.org>
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* Copyright 2004-2010 The Horde Project (http://www.horde.org/)
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*
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* See the enclosed file COPYING for license information (LGPL). If you did
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* not receive this file, see http://opensource.org/licenses/lgpl-license.php.
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*
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* @package Text_Diff
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* @author Geoffrey T. Dairiki <dairiki@dairiki.org>
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*/
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class Text_Diff {
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/**
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* Array of changes.
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*
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* @var array
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*/
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var $_edits;
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/**
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* Computes diffs between sequences of strings.
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*
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* @param string $engine Name of the diffing engine to use. 'auto'
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* will automatically select the best.
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* @param array $params Parameters to pass to the diffing engine.
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* Normally an array of two arrays, each
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* containing the lines from a file.
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*/
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function __construct( $engine, $params )
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{
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// Backward compatibility workaround.
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if (!is_string($engine)) {
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$params = array($engine, $params);
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$engine = 'auto';
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}
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if ($engine == 'auto') {
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$engine = extension_loaded('xdiff') ? 'xdiff' : 'native';
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} else {
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$engine = basename($engine);
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}
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// WP #7391
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require_once dirname(__FILE__).'/Diff/Engine/' . $engine . '.php';
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$class = 'Text_Diff_Engine_' . $engine;
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$diff_engine = new $class();
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$this->_edits = call_user_func_array(array($diff_engine, 'diff'), $params);
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}
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/**
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* PHP4 constructor.
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*/
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public function Text_Diff( $engine, $params ) {
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self::__construct( $engine, $params );
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}
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/**
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* Returns the array of differences.
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*/
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function getDiff()
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{
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return $this->_edits;
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}
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/**
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* returns the number of new (added) lines in a given diff.
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*
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* @since Text_Diff 1.1.0
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*
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* @return integer The number of new lines
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*/
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function countAddedLines()
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{
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$count = 0;
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foreach ($this->_edits as $edit) {
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if (is_a($edit, 'Text_Diff_Op_add') ||
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is_a($edit, 'Text_Diff_Op_change')) {
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$count += $edit->nfinal();
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}
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}
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return $count;
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}
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/**
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* Returns the number of deleted (removed) lines in a given diff.
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*
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* @since Text_Diff 1.1.0
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*
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* @return integer The number of deleted lines
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*/
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function countDeletedLines()
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{
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$count = 0;
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foreach ($this->_edits as $edit) {
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if (is_a($edit, 'Text_Diff_Op_delete') ||
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is_a($edit, 'Text_Diff_Op_change')) {
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$count += $edit->norig();
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}
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}
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return $count;
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}
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/**
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* Computes a reversed diff.
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*
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* Example:
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* <code>
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* $diff = new Text_Diff($lines1, $lines2);
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* $rev = $diff->reverse();
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* </code>
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*
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* @return Text_Diff A Diff object representing the inverse of the
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* original diff. Note that we purposely don't return a
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* reference here, since this essentially is a clone()
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* method.
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*/
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function reverse()
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{
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if (version_compare(zend_version(), '2', '>')) {
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$rev = clone($this);
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} else {
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$rev = $this;
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}
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$rev->_edits = array();
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foreach ($this->_edits as $edit) {
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$rev->_edits[] = $edit->reverse();
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}
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return $rev;
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}
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/**
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* Checks for an empty diff.
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*
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* @return boolean True if two sequences were identical.
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*/
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function isEmpty()
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{
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foreach ($this->_edits as $edit) {
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if (!is_a($edit, 'Text_Diff_Op_copy')) {
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return false;
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}
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}
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return true;
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}
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/**
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* Computes the length of the Longest Common Subsequence (LCS).
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*
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* This is mostly for diagnostic purposes.
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*
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* @return integer The length of the LCS.
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*/
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function lcs()
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{
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$lcs = 0;
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foreach ($this->_edits as $edit) {
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if (is_a($edit, 'Text_Diff_Op_copy')) {
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$lcs += count($edit->orig);
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}
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}
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return $lcs;
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}
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/**
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* Gets the original set of lines.
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*
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* This reconstructs the $from_lines parameter passed to the constructor.
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*
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* @return array The original sequence of strings.
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*/
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function getOriginal()
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{
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$lines = array();
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foreach ($this->_edits as $edit) {
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if ($edit->orig) {
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array_splice($lines, count($lines), 0, $edit->orig);
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}
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}
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return $lines;
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}
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/**
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* Gets the final set of lines.
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*
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* This reconstructs the $to_lines parameter passed to the constructor.
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*
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* @return array The sequence of strings.
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*/
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function getFinal()
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{
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$lines = array();
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foreach ($this->_edits as $edit) {
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if ($edit->final) {
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array_splice($lines, count($lines), 0, $edit->final);
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}
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}
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return $lines;
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}
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/**
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* Removes trailing newlines from a line of text. This is meant to be used
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* with array_walk().
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*
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* @param string $line The line to trim.
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* @param integer $key The index of the line in the array. Not used.
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*/
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static function trimNewlines(&$line, $key)
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{
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$line = str_replace(array("\n", "\r"), '', $line);
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}
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/**
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* Determines the location of the system temporary directory.
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*
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* @static
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*
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* @access protected
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*
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* @return string A directory name which can be used for temp files.
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* Returns false if one could not be found.
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*/
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function _getTempDir()
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{
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$tmp_locations = array('/tmp', '/var/tmp', 'c:\WUTemp', 'c:\temp',
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'c:\windows\temp', 'c:\winnt\temp');
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/* Try PHP's upload_tmp_dir directive. */
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$tmp = ini_get('upload_tmp_dir');
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/* Otherwise, try to determine the TMPDIR environment variable. */
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if (!strlen($tmp)) {
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$tmp = getenv('TMPDIR');
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}
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/* If we still cannot determine a value, then cycle through a list of
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* preset possibilities. */
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while (!strlen($tmp) && count($tmp_locations)) {
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$tmp_check = array_shift($tmp_locations);
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if (@is_dir($tmp_check)) {
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$tmp = $tmp_check;
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}
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}
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/* If it is still empty, we have failed, so return false; otherwise
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* return the directory determined. */
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return strlen($tmp) ? $tmp : false;
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}
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/**
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* Checks a diff for validity.
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*
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* This is here only for debugging purposes.
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*/
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function _check($from_lines, $to_lines)
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{
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if (serialize($from_lines) != serialize($this->getOriginal())) {
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trigger_error("Reconstructed original doesn't match", E_USER_ERROR);
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}
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if (serialize($to_lines) != serialize($this->getFinal())) {
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trigger_error("Reconstructed final doesn't match", E_USER_ERROR);
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}
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$rev = $this->reverse();
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if (serialize($to_lines) != serialize($rev->getOriginal())) {
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trigger_error("Reversed original doesn't match", E_USER_ERROR);
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}
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if (serialize($from_lines) != serialize($rev->getFinal())) {
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trigger_error("Reversed final doesn't match", E_USER_ERROR);
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}
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$prevtype = null;
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foreach ($this->_edits as $edit) {
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if ($prevtype == get_class($edit)) {
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trigger_error("Edit sequence is non-optimal", E_USER_ERROR);
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}
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$prevtype = get_class($edit);
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}
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return true;
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}
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}
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/**
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* @package Text_Diff
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* @author Geoffrey T. Dairiki <dairiki@dairiki.org>
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*/
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class Text_MappedDiff extends Text_Diff {
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/**
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* Computes a diff between sequences of strings.
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*
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* This can be used to compute things like case-insensitve diffs, or diffs
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* which ignore changes in white-space.
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*
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* @param array $from_lines An array of strings.
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* @param array $to_lines An array of strings.
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* @param array $mapped_from_lines This array should have the same size
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* number of elements as $from_lines. The
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* elements in $mapped_from_lines and
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* $mapped_to_lines are what is actually
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* compared when computing the diff.
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* @param array $mapped_to_lines This array should have the same number
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* of elements as $to_lines.
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*/
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function __construct($from_lines, $to_lines,
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$mapped_from_lines, $mapped_to_lines)
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{
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assert(count($from_lines) == count($mapped_from_lines));
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assert(count($to_lines) == count($mapped_to_lines));
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parent::Text_Diff($mapped_from_lines, $mapped_to_lines);
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$xi = $yi = 0;
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for ($i = 0; $i < count($this->_edits); $i++) {
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$orig = &$this->_edits[$i]->orig;
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if (is_array($orig)) {
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$orig = array_slice($from_lines, $xi, count($orig));
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$xi += count($orig);
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}
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$final = &$this->_edits[$i]->final;
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if (is_array($final)) {
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$final = array_slice($to_lines, $yi, count($final));
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$yi += count($final);
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}
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}
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}
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/**
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* PHP4 constructor.
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*/
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public function Text_MappedDiff( $from_lines, $to_lines,
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$mapped_from_lines, $mapped_to_lines ) {
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self::__construct( $from_lines, $to_lines,
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$mapped_from_lines, $mapped_to_lines );
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}
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}
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/**
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* @package Text_Diff
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* @author Geoffrey T. Dairiki <dairiki@dairiki.org>
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*
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* @access private
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*/
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class Text_Diff_Op {
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var $orig;
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var $final;
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function &reverse()
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{
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trigger_error('Abstract method', E_USER_ERROR);
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}
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function norig()
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{
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return $this->orig ? count($this->orig) : 0;
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}
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function nfinal()
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{
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return $this->final ? count($this->final) : 0;
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}
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}
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/**
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||||
* @package Text_Diff
|
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* @author Geoffrey T. Dairiki <dairiki@dairiki.org>
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*
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* @access private
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*/
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class Text_Diff_Op_copy extends Text_Diff_Op {
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/**
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||||
* PHP5 constructor.
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||||
*/
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function __construct( $orig, $final = false )
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||||
{
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||||
if (!is_array($final)) {
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||||
$final = $orig;
|
||||
}
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||||
$this->orig = $orig;
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||||
$this->final = $final;
|
||||
}
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||||
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/**
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||||
* PHP4 constructor.
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||||
*/
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||||
public function Text_Diff_Op_copy( $orig, $final = false ) {
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self::__construct( $orig, $final );
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}
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||||
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function &reverse()
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||||
{
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$reverse = new Text_Diff_Op_copy($this->final, $this->orig);
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return $reverse;
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||||
}
|
||||
|
||||
}
|
||||
|
||||
/**
|
||||
* @package Text_Diff
|
||||
* @author Geoffrey T. Dairiki <dairiki@dairiki.org>
|
||||
*
|
||||
* @access private
|
||||
*/
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||||
class Text_Diff_Op_delete extends Text_Diff_Op {
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||||
|
||||
/**
|
||||
* PHP5 constructor.
|
||||
*/
|
||||
function __construct( $lines )
|
||||
{
|
||||
$this->orig = $lines;
|
||||
$this->final = false;
|
||||
}
|
||||
|
||||
/**
|
||||
* PHP4 constructor.
|
||||
*/
|
||||
public function Text_Diff_Op_delete( $lines ) {
|
||||
self::__construct( $lines );
|
||||
}
|
||||
|
||||
function &reverse()
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||||
{
|
||||
$reverse = new Text_Diff_Op_add($this->orig);
|
||||
return $reverse;
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
/**
|
||||
* @package Text_Diff
|
||||
* @author Geoffrey T. Dairiki <dairiki@dairiki.org>
|
||||
*
|
||||
* @access private
|
||||
*/
|
||||
class Text_Diff_Op_add extends Text_Diff_Op {
|
||||
|
||||
/**
|
||||
* PHP5 constructor.
|
||||
*/
|
||||
function __construct( $lines )
|
||||
{
|
||||
$this->final = $lines;
|
||||
$this->orig = false;
|
||||
}
|
||||
|
||||
/**
|
||||
* PHP4 constructor.
|
||||
*/
|
||||
public function Text_Diff_Op_add( $lines ) {
|
||||
self::__construct( $lines );
|
||||
}
|
||||
|
||||
function &reverse()
|
||||
{
|
||||
$reverse = new Text_Diff_Op_delete($this->final);
|
||||
return $reverse;
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
/**
|
||||
* @package Text_Diff
|
||||
* @author Geoffrey T. Dairiki <dairiki@dairiki.org>
|
||||
*
|
||||
* @access private
|
||||
*/
|
||||
class Text_Diff_Op_change extends Text_Diff_Op {
|
||||
|
||||
/**
|
||||
* PHP5 constructor.
|
||||
*/
|
||||
function __construct( $orig, $final )
|
||||
{
|
||||
$this->orig = $orig;
|
||||
$this->final = $final;
|
||||
}
|
||||
|
||||
/**
|
||||
* PHP4 constructor.
|
||||
*/
|
||||
public function Text_Diff_Op_change( $orig, $final ) {
|
||||
self::__construct( $orig, $final );
|
||||
}
|
||||
|
||||
function &reverse()
|
||||
{
|
||||
$reverse = new Text_Diff_Op_change($this->final, $this->orig);
|
||||
return $reverse;
|
||||
}
|
||||
|
||||
}
|
||||
242
wp/wp-includes/Text/Diff/Renderer.php
Normal file
242
wp/wp-includes/Text/Diff/Renderer.php
Normal file
@@ -0,0 +1,242 @@
|
||||
<?php
|
||||
/**
|
||||
* A class to render Diffs in different formats.
|
||||
*
|
||||
* This class renders the diff in classic diff format. It is intended that
|
||||
* this class be customized via inheritance, to obtain fancier outputs.
|
||||
*
|
||||
* Copyright 2004-2010 The Horde Project (http://www.horde.org/)
|
||||
*
|
||||
* See the enclosed file COPYING for license information (LGPL). If you did
|
||||
* not receive this file, see http://opensource.org/licenses/lgpl-license.php.
|
||||
*
|
||||
* @package Text_Diff
|
||||
*/
|
||||
class Text_Diff_Renderer {
|
||||
|
||||
/**
|
||||
* Number of leading context "lines" to preserve.
|
||||
*
|
||||
* This should be left at zero for this class, but subclasses may want to
|
||||
* set this to other values.
|
||||
*/
|
||||
var $_leading_context_lines = 0;
|
||||
|
||||
/**
|
||||
* Number of trailing context "lines" to preserve.
|
||||
*
|
||||
* This should be left at zero for this class, but subclasses may want to
|
||||
* set this to other values.
|
||||
*/
|
||||
var $_trailing_context_lines = 0;
|
||||
|
||||
/**
|
||||
* Constructor.
|
||||
*/
|
||||
function __construct( $params = array() )
|
||||
{
|
||||
foreach ($params as $param => $value) {
|
||||
$v = '_' . $param;
|
||||
if (isset($this->$v)) {
|
||||
$this->$v = $value;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* PHP4 constructor.
|
||||
*/
|
||||
public function Text_Diff_Renderer( $params = array() ) {
|
||||
self::__construct( $params );
|
||||
}
|
||||
|
||||
/**
|
||||
* Get any renderer parameters.
|
||||
*
|
||||
* @return array All parameters of this renderer object.
|
||||
*/
|
||||
function getParams()
|
||||
{
|
||||
$params = array();
|
||||
foreach (get_object_vars($this) as $k => $v) {
|
||||
if ($k[0] == '_') {
|
||||
$params[substr($k, 1)] = $v;
|
||||
}
|
||||
}
|
||||
|
||||
return $params;
|
||||
}
|
||||
|
||||
/**
|
||||
* Renders a diff.
|
||||
*
|
||||
* @param Text_Diff $diff A Text_Diff object.
|
||||
*
|
||||
* @return string The formatted output.
|
||||
*/
|
||||
function render($diff)
|
||||
{
|
||||
$xi = $yi = 1;
|
||||
$block = false;
|
||||
$context = array();
|
||||
|
||||
$nlead = $this->_leading_context_lines;
|
||||
$ntrail = $this->_trailing_context_lines;
|
||||
|
||||
$output = $this->_startDiff();
|
||||
|
||||
$diffs = $diff->getDiff();
|
||||
foreach ($diffs as $i => $edit) {
|
||||
/* If these are unchanged (copied) lines, and we want to keep
|
||||
* leading or trailing context lines, extract them from the copy
|
||||
* block. */
|
||||
if (is_a($edit, 'Text_Diff_Op_copy')) {
|
||||
/* Do we have any diff blocks yet? */
|
||||
if (is_array($block)) {
|
||||
/* How many lines to keep as context from the copy
|
||||
* block. */
|
||||
$keep = $i == count($diffs) - 1 ? $ntrail : $nlead + $ntrail;
|
||||
if (count($edit->orig) <= $keep) {
|
||||
/* We have less lines in the block than we want for
|
||||
* context => keep the whole block. */
|
||||
$block[] = $edit;
|
||||
} else {
|
||||
if ($ntrail) {
|
||||
/* Create a new block with as many lines as we need
|
||||
* for the trailing context. */
|
||||
$context = array_slice($edit->orig, 0, $ntrail);
|
||||
$block[] = new Text_Diff_Op_copy($context);
|
||||
}
|
||||
/* @todo */
|
||||
$output .= $this->_block($x0, $ntrail + $xi - $x0,
|
||||
$y0, $ntrail + $yi - $y0,
|
||||
$block);
|
||||
$block = false;
|
||||
}
|
||||
}
|
||||
/* Keep the copy block as the context for the next block. */
|
||||
$context = $edit->orig;
|
||||
} else {
|
||||
/* Don't we have any diff blocks yet? */
|
||||
if (!is_array($block)) {
|
||||
/* Extract context lines from the preceding copy block. */
|
||||
$context = array_slice($context, count($context) - $nlead);
|
||||
$x0 = $xi - count($context);
|
||||
$y0 = $yi - count($context);
|
||||
$block = array();
|
||||
if ($context) {
|
||||
$block[] = new Text_Diff_Op_copy($context);
|
||||
}
|
||||
}
|
||||
$block[] = $edit;
|
||||
}
|
||||
|
||||
if ($edit->orig) {
|
||||
$xi += count($edit->orig);
|
||||
}
|
||||
if ($edit->final) {
|
||||
$yi += count($edit->final);
|
||||
}
|
||||
}
|
||||
|
||||
if (is_array($block)) {
|
||||
$output .= $this->_block($x0, $xi - $x0,
|
||||
$y0, $yi - $y0,
|
||||
$block);
|
||||
}
|
||||
|
||||
return $output . $this->_endDiff();
|
||||
}
|
||||
|
||||
function _block($xbeg, $xlen, $ybeg, $ylen, &$edits)
|
||||
{
|
||||
$output = $this->_startBlock($this->_blockHeader($xbeg, $xlen, $ybeg, $ylen));
|
||||
|
||||
foreach ($edits as $edit) {
|
||||
switch (strtolower(get_class($edit))) {
|
||||
case 'text_diff_op_copy':
|
||||
$output .= $this->_context($edit->orig);
|
||||
break;
|
||||
|
||||
case 'text_diff_op_add':
|
||||
$output .= $this->_added($edit->final);
|
||||
break;
|
||||
|
||||
case 'text_diff_op_delete':
|
||||
$output .= $this->_deleted($edit->orig);
|
||||
break;
|
||||
|
||||
case 'text_diff_op_change':
|
||||
$output .= $this->_changed($edit->orig, $edit->final);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
return $output . $this->_endBlock();
|
||||
}
|
||||
|
||||
function _startDiff()
|
||||
{
|
||||
return '';
|
||||
}
|
||||
|
||||
function _endDiff()
|
||||
{
|
||||
return '';
|
||||
}
|
||||
|
||||
function _blockHeader($xbeg, $xlen, $ybeg, $ylen)
|
||||
{
|
||||
if ($xlen > 1) {
|
||||
$xbeg .= ',' . ($xbeg + $xlen - 1);
|
||||
}
|
||||
if ($ylen > 1) {
|
||||
$ybeg .= ',' . ($ybeg + $ylen - 1);
|
||||
}
|
||||
|
||||
// this matches the GNU Diff behaviour
|
||||
if ($xlen && !$ylen) {
|
||||
$ybeg--;
|
||||
} elseif (!$xlen) {
|
||||
$xbeg--;
|
||||
}
|
||||
|
||||
return $xbeg . ($xlen ? ($ylen ? 'c' : 'd') : 'a') . $ybeg;
|
||||
}
|
||||
|
||||
function _startBlock($header)
|
||||
{
|
||||
return $header . "\n";
|
||||
}
|
||||
|
||||
function _endBlock()
|
||||
{
|
||||
return '';
|
||||
}
|
||||
|
||||
function _lines($lines, $prefix = ' ')
|
||||
{
|
||||
return $prefix . implode("\n$prefix", $lines) . "\n";
|
||||
}
|
||||
|
||||
function _context($lines)
|
||||
{
|
||||
return $this->_lines($lines, ' ');
|
||||
}
|
||||
|
||||
function _added($lines)
|
||||
{
|
||||
return $this->_lines($lines, '> ');
|
||||
}
|
||||
|
||||
function _deleted($lines)
|
||||
{
|
||||
return $this->_lines($lines, '< ');
|
||||
}
|
||||
|
||||
function _changed($orig, $final)
|
||||
{
|
||||
return $this->_deleted($orig) . "---\n" . $this->_added($final);
|
||||
}
|
||||
|
||||
}
|
||||
Reference in New Issue
Block a user