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9bd192fab3
This implements a new revisions ui using Backbone and preserves all the old methods of "integration" so the change should be transparent to plugins using revisi ons with CPTs. This is the first pass and so there are a number of things still to be resolved, more details in the ticket. Feedback welcomed. git-svn-id: http://core.svn.wordpress.org/trunk@23506 1a063a9b-81f0-0310-95a4-ce76da25c4cd
501 lines
13 KiB
PHP
501 lines
13 KiB
PHP
<?php
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/**
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* WordPress Diff bastard child of old MediaWiki Diff Formatter.
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*
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* Basically all that remains is the table structure and some method names.
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*
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* @package WordPress
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* @subpackage Diff
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*/
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if ( !class_exists( 'Text_Diff' ) ) {
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/** Text_Diff class */
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require( dirname(__FILE__).'/Text/Diff.php' );
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/** Text_Diff_Renderer class */
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require( dirname(__FILE__).'/Text/Diff/Renderer.php' );
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/** Text_Diff_Renderer_inline class */
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require( dirname(__FILE__).'/Text/Diff/Renderer/inline.php' );
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}
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/**
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* Table renderer to display the diff lines.
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*
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* @since 2.6.0
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* @uses Text_Diff_Renderer Extends
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*/
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class WP_Text_Diff_Renderer_Table extends Text_Diff_Renderer {
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/**
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* @see Text_Diff_Renderer::_leading_context_lines
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* @var int
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* @access protected
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* @since 2.6.0
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*/
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var $_leading_context_lines = 10000;
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/**
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* @see Text_Diff_Renderer::_trailing_context_lines
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* @var int
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* @access protected
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* @since 2.6.0
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*/
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var $_trailing_context_lines = 10000;
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/**
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* {@internal Missing Description}}
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*
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* @var float
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* @access protected
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* @since 2.6.0
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*/
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var $_diff_threshold = 0.6;
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/**
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* Inline display helper object name.
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*
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* @var string
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* @access protected
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* @since 2.6.0
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*/
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var $inline_diff_renderer = 'WP_Text_Diff_Renderer_inline';
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/**
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* Should we show the split view or not
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*
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* @var string
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* @access protected
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* @since 3.6.0
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*/
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var $_show_split_view = true;
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/**
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* Constructor - Call parent constructor with params array.
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*
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* This will set class properties based on the key value pairs in the array.
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*
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* @since 2.6.0
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*
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* @param array $params
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*/
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function __construct( $params = array() ) {
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parent::__construct( $params );
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if ( isset( $params[ 'show_split_view' ] ) )
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$this->_show_split_view = $params[ 'show_split_view' ];
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}
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/**
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* @ignore
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*
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* @param string $header
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* @return string
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*/
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function _startBlock( $header ) {
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return '';
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}
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/**
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* @ignore
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*
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* @param array $lines
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* @param string $prefix
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*/
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function _lines( $lines, $prefix=' ' ) {
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}
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/**
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* @ignore
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*
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* @param string $line HTML-escape the value.
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* @return string
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*/
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function addedLine( $line ) {
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return "<td class='diff-addedline'>{$line}</td>";
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}
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/**
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* @ignore
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*
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* @param string $line HTML-escape the value.
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* @return string
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*/
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function deletedLine( $line ) {
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return "<td class='diff-deletedline'>{$line}</td>";
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}
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/**
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* @ignore
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*
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* @param string $line HTML-escape the value.
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* @return string
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*/
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function contextLine( $line ) {
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return "<td class='diff-context'>{$line}</td>";
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}
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/**
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* @ignore
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*
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* @return string
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*/
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function emptyLine() {
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return '<td> </td>';
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}
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/**
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* @ignore
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* @access private
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*
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* @param array $lines
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* @param bool $encode
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* @return string
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*/
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function _added( $lines, $encode = true ) {
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$r = '';
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foreach ($lines as $line) {
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if ( $encode )
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$line = wp_kses_post( $line );
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if ( $this->_show_split_view ) {
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$r .= '<tr>' . $this->emptyLine() . $this->emptyLine() . $this->addedLine( $line ) . "</tr>\n";
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} else {
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$r .= '<tr>' . $this->addedLine( $line ) . "</tr>\n";
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}
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}
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return $r;
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}
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/**
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* @ignore
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* @access private
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*
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* @param array $lines
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* @param bool $encode
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* @return string
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*/
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function _deleted( $lines, $encode = true ) {
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$r = '';
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foreach ($lines as $line) {
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if ( $encode )
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$line = wp_kses_post( $line );
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if ( $this->_show_split_view ) {
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$r .= '<tr>' . $this->deletedLine( $line ) . $this->emptyLine() . $this->emptyLine() . "</tr>\n";
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} else {
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$r .= '<tr>' . $this->deletedLine( $line ) . "</tr>\n";
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}
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}
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return $r;
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}
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/**
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* @ignore
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* @access private
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*
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* @param array $lines
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* @param bool $encode
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* @return string
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*/
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function _context( $lines, $encode = true ) {
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$r = '';
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foreach ($lines as $line) {
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if ( $encode )
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$line = wp_kses_post( $line );
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if ( $this->_show_split_view ) {
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$r .= '<tr>' . $this->contextLine( $line ) . $this->emptyLine() . $this->contextLine( $line ) . "</tr>\n";
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} else {
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$r .= '<tr>' . $this->contextLine( $line ) . "</tr>\n";
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}
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}
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return $r;
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}
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/**
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* Process changed lines to do word-by-word diffs for extra highlighting.
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*
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* (TRAC style) sometimes these lines can actually be deleted or added rows.
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* We do additional processing to figure that out
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*
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* @access private
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* @since 2.6.0
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*
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* @param array $orig
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* @param array $final
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* @return string
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*/
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function _changed( $orig, $final ) {
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$r = '';
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// Does the aforementioned additional processing
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// *_matches tell what rows are "the same" in orig and final. Those pairs will be diffed to get word changes
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// match is numeric: an index in other column
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// match is 'X': no match. It is a new row
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// *_rows are column vectors for the orig column and the final column.
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// row >= 0: an indix of the $orig or $final array
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// row < 0: a blank row for that column
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list($orig_matches, $final_matches, $orig_rows, $final_rows) = $this->interleave_changed_lines( $orig, $final );
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// These will hold the word changes as determined by an inline diff
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$orig_diffs = array();
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$final_diffs = array();
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// Compute word diffs for each matched pair using the inline diff
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foreach ( $orig_matches as $o => $f ) {
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if ( is_numeric($o) && is_numeric($f) ) {
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$text_diff = new Text_Diff( 'auto', array( array($orig[$o]), array($final[$f]) ) );
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$renderer = new $this->inline_diff_renderer;
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$diff = $renderer->render( $text_diff );
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// If they're too different, don't include any <ins> or <dels>
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if ( $diff_count = preg_match_all( '!(<ins>.*?</ins>|<del>.*?</del>)!', $diff, $diff_matches ) ) {
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// length of all text between <ins> or <del>
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$stripped_matches = strlen(strip_tags( join(' ', $diff_matches[0]) ));
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// since we count lengith of text between <ins> or <del> (instead of picking just one),
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// we double the length of chars not in those tags.
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$stripped_diff = strlen(strip_tags( $diff )) * 2 - $stripped_matches;
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$diff_ratio = $stripped_matches / $stripped_diff;
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if ( $diff_ratio > $this->_diff_threshold )
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continue; // Too different. Don't save diffs.
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}
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// Un-inline the diffs by removing del or ins
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$orig_diffs[$o] = preg_replace( '|<ins>.*?</ins>|', '', $diff );
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$final_diffs[$f] = preg_replace( '|<del>.*?</del>|', '', $diff );
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}
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}
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foreach ( array_keys($orig_rows) as $row ) {
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// Both columns have blanks. Ignore them.
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if ( $orig_rows[$row] < 0 && $final_rows[$row] < 0 )
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continue;
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// If we have a word based diff, use it. Otherwise, use the normal line.
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if ( isset( $orig_diffs[$orig_rows[$row]] ) )
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$orig_line = $orig_diffs[$orig_rows[$row]];
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elseif ( isset( $orig[$orig_rows[$row]] ) )
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$orig_line = htmlspecialchars($orig[$orig_rows[$row]]);
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else
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$orig_line = '';
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if ( isset( $final_diffs[$final_rows[$row]] ) )
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$final_line = $final_diffs[$final_rows[$row]];
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elseif ( isset( $final[$final_rows[$row]] ) )
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$final_line = htmlspecialchars($final[$final_rows[$row]]);
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else
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$final_line = '';
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if ( $orig_rows[$row] < 0 ) { // Orig is blank. This is really an added row.
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$r .= $this->_added( array($final_line), false );
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} elseif ( $final_rows[$row] < 0 ) { // Final is blank. This is really a deleted row.
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$r .= $this->_deleted( array($orig_line), false );
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} else { // A true changed row.
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if ( $this->_show_split_view ) {
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$r .= '<tr>' . $this->deletedLine( $orig_line ) . $this->emptyLine() . $this->addedLine( $final_line ) . "</tr>\n";
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} else {
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$r .= '<tr>' . $this->deletedLine( $orig_line ) . "</tr><tr>" . $this->addedLine( $final_line ) . "</tr>\n";
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}
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}
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}
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return $r;
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}
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/**
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* Takes changed blocks and matches which rows in orig turned into which rows in final.
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*
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* Returns
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* *_matches ( which rows match with which )
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* *_rows ( order of rows in each column interleaved with blank rows as
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* necessary )
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*
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* @since 2.6.0
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*
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* @param unknown_type $orig
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* @param unknown_type $final
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* @return unknown
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*/
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function interleave_changed_lines( $orig, $final ) {
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// Contains all pairwise string comparisons. Keys are such that this need only be a one dimensional array.
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$matches = array();
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foreach ( array_keys($orig) as $o ) {
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foreach ( array_keys($final) as $f ) {
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$matches["$o,$f"] = $this->compute_string_distance( $orig[$o], $final[$f] );
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}
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}
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asort($matches); // Order by string distance.
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$orig_matches = array();
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$final_matches = array();
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foreach ( $matches as $keys => $difference ) {
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list($o, $f) = explode(',', $keys);
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$o = (int) $o;
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$f = (int) $f;
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// Already have better matches for these guys
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if ( isset($orig_matches[$o]) && isset($final_matches[$f]) )
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continue;
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// First match for these guys. Must be best match
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if ( !isset($orig_matches[$o]) && !isset($final_matches[$f]) ) {
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$orig_matches[$o] = $f;
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$final_matches[$f] = $o;
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continue;
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}
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// Best match of this final is already taken? Must mean this final is a new row.
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if ( isset($orig_matches[$o]) )
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$final_matches[$f] = 'x';
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// Best match of this orig is already taken? Must mean this orig is a deleted row.
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elseif ( isset($final_matches[$f]) )
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$orig_matches[$o] = 'x';
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}
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// We read the text in this order
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ksort($orig_matches);
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ksort($final_matches);
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// Stores rows and blanks for each column.
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$orig_rows = $orig_rows_copy = array_keys($orig_matches);
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$final_rows = array_keys($final_matches);
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// Interleaves rows with blanks to keep matches aligned.
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// We may end up with some extraneous blank rows, but we'll just ignore them later.
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foreach ( $orig_rows_copy as $orig_row ) {
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$final_pos = array_search($orig_matches[$orig_row], $final_rows, true);
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$orig_pos = (int) array_search($orig_row, $orig_rows, true);
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if ( false === $final_pos ) { // This orig is paired with a blank final.
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array_splice( $final_rows, $orig_pos, 0, -1 );
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} elseif ( $final_pos < $orig_pos ) { // This orig's match is up a ways. Pad final with blank rows.
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$diff_pos = $final_pos - $orig_pos;
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while ( $diff_pos < 0 )
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array_splice( $final_rows, $orig_pos, 0, $diff_pos++ );
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} elseif ( $final_pos > $orig_pos ) { // This orig's match is down a ways. Pad orig with blank rows.
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$diff_pos = $orig_pos - $final_pos;
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while ( $diff_pos < 0 )
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array_splice( $orig_rows, $orig_pos, 0, $diff_pos++ );
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}
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}
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// Pad the ends with blank rows if the columns aren't the same length
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$diff_count = count($orig_rows) - count($final_rows);
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if ( $diff_count < 0 ) {
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while ( $diff_count < 0 )
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array_push($orig_rows, $diff_count++);
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} elseif ( $diff_count > 0 ) {
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$diff_count = -1 * $diff_count;
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while ( $diff_count < 0 )
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array_push($final_rows, $diff_count++);
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}
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return array($orig_matches, $final_matches, $orig_rows, $final_rows);
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/*
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// Debug
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echo "\n\n\n\n\n";
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echo "-- DEBUG Matches: Orig -> Final --";
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foreach ( $orig_matches as $o => $f ) {
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echo "\n\n\n\n\n";
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echo "ORIG: $o, FINAL: $f\n";
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var_dump($orig[$o],$final[$f]);
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}
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echo "\n\n\n\n\n";
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echo "-- DEBUG Matches: Final -> Orig --";
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foreach ( $final_matches as $f => $o ) {
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echo "\n\n\n\n\n";
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echo "FINAL: $f, ORIG: $o\n";
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var_dump($final[$f],$orig[$o]);
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}
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echo "\n\n\n\n\n";
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echo "-- DEBUG Rows: Orig -- Final --";
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echo "\n\n\n\n\n";
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foreach ( $orig_rows as $row => $o ) {
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if ( $o < 0 )
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$o = 'X';
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$f = $final_rows[$row];
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if ( $f < 0 )
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$f = 'X';
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echo "$o -- $f\n";
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}
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echo "\n\n\n\n\n";
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echo "-- END DEBUG --";
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echo "\n\n\n\n\n";
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return array($orig_matches, $final_matches, $orig_rows, $final_rows);
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*/
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}
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/**
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* Computes a number that is intended to reflect the "distance" between two strings.
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*
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* @since 2.6.0
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*
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* @param string $string1
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* @param string $string2
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* @return int
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*/
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function compute_string_distance( $string1, $string2 ) {
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// Vectors containing character frequency for all chars in each string
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$chars1 = count_chars($string1);
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$chars2 = count_chars($string2);
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// L1-norm of difference vector.
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$difference = array_sum( array_map( array($this, 'difference'), $chars1, $chars2 ) );
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// $string1 has zero length? Odd. Give huge penalty by not dividing.
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if ( !$string1 )
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return $difference;
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// Return distance per charcter (of string1)
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return $difference / strlen($string1);
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}
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/**
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* @ignore
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* @since 2.6.0
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*
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* @param int $a
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* @param int $b
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* @return int
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*/
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function difference( $a, $b ) {
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return abs( $a - $b );
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}
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}
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/**
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* Better word splitting than the PEAR package provides.
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*
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* @since 2.6.0
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* @uses Text_Diff_Renderer_inline Extends
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*/
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class WP_Text_Diff_Renderer_inline extends Text_Diff_Renderer_inline {
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/**
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* @ignore
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* @since 2.6.0
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*
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* @param string $string
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* @param string $newlineEscape
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* @return string
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*/
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function _splitOnWords($string, $newlineEscape = "\n") {
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$string = str_replace("\0", '', $string);
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$words = preg_split( '/([^\w])/u', $string, -1, PREG_SPLIT_DELIM_CAPTURE );
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$words = str_replace( "\n", $newlineEscape, $words );
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return $words;
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}
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}
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