| 1 | <?php
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| 2 | /**
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| 3 | * WordPress Diff bastard child of old MediaWiki Diff Formatter.
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| 4 | *
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| 5 | * Basically all that remains is the table structure and some method names.
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| 6 | *
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| 7 | * @package WordPress
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| 8 | * @subpackage Diff
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| 9 | */
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| 10 |
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| 11 | if ( !class_exists( 'Text_Diff' ) ) {
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| 12 | /** Text_Diff class */
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| 13 | require( dirname(__FILE__).'/Text/Diff.php' );
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| 14 | /** Text_Diff_Renderer class */
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| 15 | require( dirname(__FILE__).'/Text/Diff/Renderer.php' );
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| 16 | /** Text_Diff_Renderer_inline class */
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| 17 | require( dirname(__FILE__).'/Text/Diff/Renderer/inline.php' );
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| 18 | }
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| 19 |
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| 20 | /**
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| 21 | * Table renderer to display the diff lines.
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| 22 | *
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| 23 | * @since 2.6.0
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| 24 | * @uses Text_Diff_Renderer Extends
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| 25 | */
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| 26 | class WP_Text_Diff_Renderer_Table extends Text_Diff_Renderer {
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| 27 |
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| 28 | /**
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| 29 | * @see Text_Diff_Renderer::_leading_context_lines
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| 30 | * @var int
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| 31 | * @access protected
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| 32 | * @since 2.6.0
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| 33 | */
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| 34 | var $_leading_context_lines = 10000;
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| 35 |
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| 36 | /**
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| 37 | * @see Text_Diff_Renderer::_trailing_context_lines
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| 38 | * @var int
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| 39 | * @access protected
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| 40 | * @since 2.6.0
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| 41 | */
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| 42 | var $_trailing_context_lines = 10000;
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| 43 |
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| 44 | /**
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| 45 | * {@internal Missing Description}}
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| 46 | *
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| 47 | * @var float
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| 48 | * @access protected
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| 49 | * @since 2.6.0
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| 50 | */
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| 51 | var $_diff_threshold = 0.6;
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| 52 |
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| 53 | /**
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| 54 | * Inline display helper object name.
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| 55 | *
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| 56 | * @var string
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| 57 | * @access protected
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| 58 | * @since 2.6.0
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| 59 | */
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| 60 | var $inline_diff_renderer = 'WP_Text_Diff_Renderer_inline';
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| 61 |
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| 62 | /**
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| 63 | * PHP4 Constructor - Call parent constructor with params array.
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| 64 | *
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| 65 | * This will set class properties based on the key value pairs in the array.
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| 66 | *
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| 67 | * @since unknown
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| 68 | *
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| 69 | * @param array $params
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| 70 | */
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| 71 | function Text_Diff_Renderer_Table( $params = array() ) {
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| 72 | $parent = get_parent_class($this);
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| 73 | $this->$parent( $params );
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| 74 | }
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| 75 |
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| 76 | /**
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| 77 | * @ignore
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| 78 | *
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| 79 | * @param string $header
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| 80 | * @return string
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| 81 | */
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| 82 | function _startBlock( $header ) {
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| 83 | return '';
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| 84 | }
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| 85 |
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| 86 | /**
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| 87 | * @ignore
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| 88 | *
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| 89 | * @param array $lines
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| 90 | * @param string $prefix
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| 91 | */
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| 92 | function _lines( $lines, $prefix=' ' ) {
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| 93 | }
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| 94 |
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| 95 | /**
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| 96 | * @ignore
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| 97 | *
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| 98 | * @param string $line HTML-escape the value.
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| 99 | * @return string
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| 100 | */
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| 101 | function addedLine( $line ) {
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| 102 | return "<td>+</td><td class='diff-addedline'>{$line}</td>";
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| 103 | }
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| 104 |
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| 105 | /**
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| 106 | * @ignore
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| 107 | *
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| 108 | * @param string $line HTML-escape the value.
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| 109 | * @return string
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| 110 | */
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| 111 | function deletedLine( $line ) {
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| 112 | return "<td>-</td><td class='diff-deletedline'>{$line}</td>";
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| 113 | }
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| 114 |
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| 115 | /**
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| 116 | * @ignore
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| 117 | *
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| 118 | * @param string $line HTML-escape the value.
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| 119 | * @return string
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| 120 | */
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| 121 | function contextLine( $line ) {
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| 122 | return "<td> </td><td class='diff-context'>{$line}</td>";
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| 123 | }
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| 124 |
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| 125 | /**
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| 126 | * @ignore
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| 127 | *
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| 128 | * @return string
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| 129 | */
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| 130 | function emptyLine() {
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| 131 | return '<td colspan="2"> </td>';
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| 132 | }
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| 133 |
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| 134 | /**
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| 135 | * @ignore
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| 136 | * @access private
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| 137 | *
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| 138 | * @param array $lines
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| 139 | * @param bool $encode
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| 140 | * @return string
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| 141 | */
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| 142 | function _added( $lines, $encode = true ) {
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| 143 | $r = '';
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| 144 | foreach ($lines as $line) {
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| 145 | if ( $encode )
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| 146 | $line = htmlspecialchars( $line );
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| 147 | $r .= '<tr>' . $this->emptyLine() . $this->addedLine( $line ) . "</tr>\n";
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| 148 | }
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| 149 | return $r;
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| 150 | }
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| 151 |
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| 152 | /**
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| 153 | * @ignore
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| 154 | * @access private
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| 155 | *
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| 156 | * @param array $lines
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| 157 | * @param bool $encode
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| 158 | * @return string
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| 159 | */
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| 160 | function _deleted( $lines, $encode = true ) {
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| 161 | $r = '';
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| 162 | foreach ($lines as $line) {
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| 163 | if ( $encode )
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| 164 | $line = htmlspecialchars( $line );
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| 165 | $r .= '<tr>' . $this->deletedLine( $line ) . $this->emptyLine() . "</tr>\n";
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| 166 | }
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| 167 | return $r;
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| 168 | }
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| 169 |
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| 170 | /**
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| 171 | * @ignore
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| 172 | * @access private
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| 173 | *
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| 174 | * @param array $lines
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| 175 | * @param bool $encode
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| 176 | * @return string
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| 177 | */
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| 178 | function _context( $lines, $encode = true ) {
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| 179 | $r = '';
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| 180 | foreach ($lines as $line) {
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| 181 | if ( $encode )
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| 182 | $line = htmlspecialchars( $line );
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| 183 | $r .= '<tr>' .
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| 184 | $this->contextLine( $line ) . $this->contextLine( $line ) . "</tr>\n";
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| 185 | }
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| 186 | return $r;
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| 187 | }
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| 188 |
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| 189 | /**
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| 190 | * Process changed lines to do word-by-word diffs for extra highlighting.
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| 191 | *
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| 192 | * (TRAC style) sometimes these lines can actually be deleted or added rows.
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| 193 | * We do additional processing to figure that out
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| 194 | *
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| 195 | * @access private
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| 196 | * @since 2.6.0
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| 197 | *
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| 198 | * @param array $orig
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| 199 | * @param array $final
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| 200 | * @return string
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| 201 | */
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| 202 | function _changed( $orig, $final ) {
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| 203 | $r = '';
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| 204 |
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| 205 | // Does the aforementioned additional processing
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| 206 | // *_matches tell what rows are "the same" in orig and final. Those pairs will be diffed to get word changes
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| 207 | // match is numeric: an index in other column
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| 208 | // match is 'X': no match. It is a new row
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| 209 | // *_rows are column vectors for the orig column and the final column.
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| 210 | // row >= 0: an indix of the $orig or $final array
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| 211 | // row < 0: a blank row for that column
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| 212 | list($orig_matches, $final_matches, $orig_rows, $final_rows) = $this->interleave_changed_lines( $orig, $final );
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| 213 |
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| 214 |
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| 215 | // These will hold the word changes as determined by an inline diff
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| 216 | $orig_diffs = array();
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| 217 | $final_diffs = array();
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| 218 |
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| 219 | // Compute word diffs for each matched pair using the inline diff
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| 220 | foreach ( $orig_matches as $o => $f ) {
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| 221 | if ( is_numeric($o) && is_numeric($f) ) {
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| 222 | $text_diff = new Text_Diff( 'auto', array( array($orig[$o]), array($final[$f]) ) );
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| 223 | $renderer = new $this->inline_diff_renderer;
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| 224 | $diff = $renderer->render( $text_diff );
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| 225 |
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| 226 | // If they're too different, don't include any <ins> or <dels>
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| 227 | if ( $diff_count = preg_match_all( '!(<ins>.*?</ins>|<del>.*?</del>)!', $diff, $diff_matches ) ) {
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| 228 | // length of all text between <ins> or <del>
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| 229 | $stripped_matches = strlen(strip_tags( join(' ', $diff_matches[0]) ));
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| 230 | // since we count lengith of text between <ins> or <del> (instead of picking just one),
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| 231 | // we double the length of chars not in those tags.
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| 232 | $stripped_diff = strlen(strip_tags( $diff )) * 2 - $stripped_matches;
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| 233 | $diff_ratio = $stripped_matches / $stripped_diff;
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| 234 | if ( $diff_ratio > $this->_diff_threshold )
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| 235 | continue; // Too different. Don't save diffs.
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| 236 | }
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| 237 |
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| 238 | // Un-inline the diffs by removing del or ins
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| 239 | $orig_diffs[$o] = preg_replace( '|<ins>.*?</ins>|', '', $diff );
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| 240 | $final_diffs[$f] = preg_replace( '|<del>.*?</del>|', '', $diff );
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| 241 | }
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| 242 | }
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| 243 |
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| 244 | foreach ( array_keys($orig_rows) as $row ) {
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| 245 | // Both columns have blanks. Ignore them.
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| 246 | if ( $orig_rows[$row] < 0 && $final_rows[$row] < 0 )
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| 247 | continue;
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| 248 |
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| 249 | // If we have a word based diff, use it. Otherwise, use the normal line.
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| 250 | $orig_line = isset($orig_diffs[$orig_rows[$row]])
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| 251 | ? $orig_diffs[$orig_rows[$row]]
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| 252 | : htmlspecialchars($orig[$orig_rows[$row]]);
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| 253 | $final_line = isset($final_diffs[$final_rows[$row]])
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| 254 | ? $final_diffs[$final_rows[$row]]
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| 255 | : htmlspecialchars($final[$final_rows[$row]]);
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| 256 |
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| 257 | if ( $orig_rows[$row] < 0 ) { // Orig is blank. This is really an added row.
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| 258 | $r .= $this->_added( array($final_line), false );
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| 259 | } elseif ( $final_rows[$row] < 0 ) { // Final is blank. This is really a deleted row.
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| 260 | $r .= $this->_deleted( array($orig_line), false );
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| 261 | } else { // A true changed row.
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| 262 | $r .= '<tr>' . $this->deletedLine( $orig_line ) . $this->addedLine( $final_line ) . "</tr>\n";
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| 263 | }
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| 264 | }
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| 265 |
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| 266 | return $r;
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| 267 | }
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| 268 |
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| 269 | /**
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| 270 | * Takes changed blocks and matches which rows in orig turned into which rows in final.
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| 271 | *
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| 272 | * Returns
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| 273 | * *_matches ( which rows match with which )
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| 274 | * *_rows ( order of rows in each column interleaved with blank rows as
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| 275 | * necessary )
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| 276 | *
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| 277 | * @since 2.6.0
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| 278 | *
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| 279 | * @param unknown_type $orig
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| 280 | * @param unknown_type $final
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| 281 | * @return unknown
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| 282 | */
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| 283 | function interleave_changed_lines( $orig, $final ) {
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| 284 |
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| 285 | // Contains all pairwise string comparisons. Keys are such that this need only be a one dimensional array.
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| 286 | $matches = array();
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| 287 | foreach ( array_keys($orig) as $o ) {
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| 288 | foreach ( array_keys($final) as $f ) {
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| 289 | $matches["$o,$f"] = $this->compute_string_distance( $orig[$o], $final[$f] );
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| 290 | }
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| 291 | }
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| 292 | asort($matches); // Order by string distance.
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| 293 |
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| 294 | $orig_matches = array();
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| 295 | $final_matches = array();
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| 296 |
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| 297 | foreach ( $matches as $keys => $difference ) {
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| 298 | list($o, $f) = explode(',', $keys);
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| 299 | $o = (int) $o;
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| 300 | $f = (int) $f;
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| 301 |
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| 302 | // Already have better matches for these guys
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| 303 | if ( isset($orig_matches[$o]) && isset($final_matches[$f]) )
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| 304 | continue;
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| 305 |
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| 306 | // First match for these guys. Must be best match
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| 307 | if ( !isset($orig_matches[$o]) && !isset($final_matches[$f]) ) {
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| 308 | $orig_matches[$o] = $f;
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| 309 | $final_matches[$f] = $o;
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| 310 | continue;
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| 311 | }
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| 312 |
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| 313 | // Best match of this final is already taken? Must mean this final is a new row.
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| 314 | if ( isset($orig_matches[$o]) )
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| 315 | $final_matches[$f] = 'x';
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| 316 |
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| 317 | // Best match of this orig is already taken? Must mean this orig is a deleted row.
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| 318 | elseif ( isset($final_matches[$f]) )
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| 319 | $orig_matches[$o] = 'x';
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| 320 | }
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| 321 |
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| 322 | // We read the text in this order
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| 323 | ksort($orig_matches);
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| 324 | ksort($final_matches);
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| 325 |
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| 326 |
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| 327 | // Stores rows and blanks for each column.
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| 328 | $orig_rows = $orig_rows_copy = array_keys($orig_matches);
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| 329 | $final_rows = array_keys($final_matches);
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| 330 |
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| 331 | // Interleaves rows with blanks to keep matches aligned.
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| 332 | // We may end up with some extraneous blank rows, but we'll just ignore them later.
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| 333 | foreach ( $orig_rows_copy as $orig_row ) {
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| 334 | $final_pos = array_search($orig_matches[$orig_row], $final_rows, true);
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| 335 | $orig_pos = (int) array_search($orig_row, $orig_rows, true);
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| 336 |
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| 337 | if ( false === $final_pos ) { // This orig is paired with a blank final.
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| 338 | array_splice( $final_rows, $orig_pos, 0, -1 );
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| 339 | } elseif ( $final_pos < $orig_pos ) { // This orig's match is up a ways. Pad final with blank rows.
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| 340 | $diff_pos = $final_pos - $orig_pos;
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| 341 | while ( $diff_pos < 0 )
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| 342 | array_splice( $final_rows, $orig_pos, 0, $diff_pos++ );
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| 343 | } elseif ( $final_pos > $orig_pos ) { // This orig's match is down a ways. Pad orig with blank rows.
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| 344 | $diff_pos = $orig_pos - $final_pos;
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| 345 | while ( $diff_pos < 0 )
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| 346 | array_splice( $orig_rows, $orig_pos, 0, $diff_pos++ );
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| 347 | }
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| 348 | }
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| 349 |
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| 350 |
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| 351 | // Pad the ends with blank rows if the columns aren't the same length
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| 352 | $diff_count = count($orig_rows) - count($final_rows);
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| 353 | if ( $diff_count < 0 ) {
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| 354 | while ( $diff_count < 0 )
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| 355 | array_push($orig_rows, $diff_count++);
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| 356 | } elseif ( $diff_count > 0 ) {
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| 357 | $diff_count = -1 * $diff_count;
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| 358 | while ( $diff_count < 0 )
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| 359 | array_push($final_rows, $diff_count++);
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| 360 | }
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| 361 |
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| 362 | return array($orig_matches, $final_matches, $orig_rows, $final_rows);
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| 363 |
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| 364 | /*
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| 365 | // Debug
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| 366 | echo "\n\n\n\n\n";
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| 367 |
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| 368 | echo "-- DEBUG Matches: Orig -> Final --";
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| 369 |
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| 370 | foreach ( $orig_matches as $o => $f ) {
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| 371 | echo "\n\n\n\n\n";
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| 372 | echo "ORIG: $o, FINAL: $f\n";
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| 373 | var_dump($orig[$o],$final[$f]);
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| 374 | }
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| 375 | echo "\n\n\n\n\n";
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| 376 |
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| 377 | echo "-- DEBUG Matches: Final -> Orig --";
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| 378 |
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| 379 | foreach ( $final_matches as $f => $o ) {
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| 380 | echo "\n\n\n\n\n";
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| 381 | echo "FINAL: $f, ORIG: $o\n";
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| 382 | var_dump($final[$f],$orig[$o]);
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| 383 | }
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| 384 | echo "\n\n\n\n\n";
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| 385 |
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| 386 | echo "-- DEBUG Rows: Orig -- Final --";
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| 387 |
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| 388 | echo "\n\n\n\n\n";
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| 389 | foreach ( $orig_rows as $row => $o ) {
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| 390 | if ( $o < 0 )
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| 391 | $o = 'X';
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| 392 | $f = $final_rows[$row];
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| 393 | if ( $f < 0 )
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| 394 | $f = 'X';
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| 395 | echo "$o -- $f\n";
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| 396 | }
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| 397 | echo "\n\n\n\n\n";
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| 398 |
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| 399 | echo "-- END DEBUG --";
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| 400 |
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| 401 | echo "\n\n\n\n\n";
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| 402 |
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| 403 | return array($orig_matches, $final_matches, $orig_rows, $final_rows);
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| 404 | */
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| 405 | }
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| 406 |
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| 407 | /**
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| 408 | * Computes a number that is intended to reflect the "distance" between two strings.
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| 409 | *
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| 410 | * @since 2.6.0
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| 411 | *
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| 412 | * @param string $string1
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| 413 | * @param string $string2
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| 414 | * @return int
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| 415 | */
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| 416 | function compute_string_distance( $string1, $string2 ) {
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| 417 | // Vectors containing character frequency for all chars in each string
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| 418 | $chars1 = count_chars($string1);
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| 419 | $chars2 = count_chars($string2);
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| 420 |
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| 421 | // L1-norm of difference vector.
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| 422 | $difference = array_sum( array_map( array(&$this, 'difference'), $chars1, $chars2 ) );
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| 423 |
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| 424 | // $string1 has zero length? Odd. Give huge penalty by not dividing.
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| 425 | if ( !$string1 )
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| 426 | return $difference;
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| 427 |
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| 428 | // Return distance per charcter (of string1)
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| 429 | return $difference / strlen($string1);
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| 430 | }
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| 431 |
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| 432 | /**
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| 433 | * @ignore
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| 434 | * @since 2.6.0
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| 435 | *
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| 436 | * @param int $a
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| 437 | * @param int $b
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| 438 | * @return int
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| 439 | */
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| 440 | function difference( $a, $b ) {
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| 441 | return abs( $a - $b );
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| 442 | }
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| 443 |
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| 444 | }
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| 445 |
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| 446 | /**
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| 447 | * Better word splitting than the PEAR package provides.
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| 448 | *
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| 449 | * @since 2.6.0
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| 450 | * @uses Text_Diff_Renderer_inline Extends
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| 451 | */
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| 452 | class WP_Text_Diff_Renderer_inline extends Text_Diff_Renderer_inline {
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| 453 |
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| 454 | /**
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| 455 | * @ignore
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| 456 | * @since 2.6.0
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| 457 | *
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| 458 | * @param string $string
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| 459 | * @param string $newlineEscape
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| 460 | * @return string
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| 461 | */
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| 462 | function _splitOnWords($string, $newlineEscape = "\n") {
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| 463 | $string = str_replace("\0", '', $string);
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| 464 | $words = preg_split( '/([^\w])/u', $string, -1, PREG_SPLIT_DELIM_CAPTURE );
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| 465 | $words = str_replace( "\n", $newlineEscape, $words );
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| 466 | return $words;
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| 467 | }
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| 468 |
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| 469 | }
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| 470 |
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| 471 | ?>
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