3 * "Inline" diff renderer.
5 * Copyright 2004-2010 The Horde Project (http://www.horde.org/)
7 * See the enclosed file COPYING for license information (LGPL). If you did
8 * not receive this file, see http://opensource.org/licenses/lgpl-license.php.
10 * @author Ciprian Popovici
14 /** Text_Diff_Renderer */
17 require_once dirname(dirname(__FILE__)) . '/Renderer.php';
20 * "Inline" diff renderer.
22 * This class renders diffs in the Wiki-style "inline" format.
24 * @author Ciprian Popovici
27 class Text_Diff_Renderer_inline extends Text_Diff_Renderer {
30 * Number of leading context "lines" to preserve.
34 var $_leading_context_lines = 10000;
37 * Number of trailing context "lines" to preserve.
41 var $_trailing_context_lines = 10000;
44 * Prefix for inserted text.
48 var $_ins_prefix = '<ins>';
51 * Suffix for inserted text.
55 var $_ins_suffix = '</ins>';
58 * Prefix for deleted text.
62 var $_del_prefix = '<del>';
65 * Suffix for deleted text.
69 var $_del_suffix = '</del>';
72 * Header for each change block.
76 var $_block_header = '';
79 * Whether to split down to character-level.
83 var $_split_characters = false;
86 * What are we currently splitting on? Used to recurse to show word-level
87 * or character-level changes.
91 var $_split_level = 'lines';
93 function _blockHeader($xbeg, $xlen, $ybeg, $ylen)
95 return $this->_block_header;
98 function _startBlock($header)
103 function _lines($lines, $prefix = ' ', $encode = true)
106 array_walk($lines, array(&$this, '_encode'));
109 if ($this->_split_level == 'lines') {
110 return implode("\n", $lines) . "\n";
112 return implode('', $lines);
116 function _added($lines)
118 array_walk($lines, array(&$this, '_encode'));
119 $lines[0] = $this->_ins_prefix . $lines[0];
120 $lines[count($lines) - 1] .= $this->_ins_suffix;
121 return $this->_lines($lines, ' ', false);
124 function _deleted($lines, $words = false)
126 array_walk($lines, array(&$this, '_encode'));
127 $lines[0] = $this->_del_prefix . $lines[0];
128 $lines[count($lines) - 1] .= $this->_del_suffix;
129 return $this->_lines($lines, ' ', false);
132 function _changed($orig, $final)
134 /* If we've already split on characters, just display. */
135 if ($this->_split_level == 'characters') {
136 return $this->_deleted($orig)
137 . $this->_added($final);
140 /* If we've already split on words, just display. */
141 if ($this->_split_level == 'words') {
143 while ($orig[0] !== false && $final[0] !== false &&
144 substr($orig[0], 0, 1) == ' ' &&
145 substr($final[0], 0, 1) == ' ') {
146 $prefix .= substr($orig[0], 0, 1);
147 $orig[0] = substr($orig[0], 1);
148 $final[0] = substr($final[0], 1);
150 return $prefix . $this->_deleted($orig) . $this->_added($final);
153 $text1 = implode("\n", $orig);
154 $text2 = implode("\n", $final);
156 /* Non-printing newline marker. */
159 if ($this->_split_characters) {
160 $diff = new Text_Diff('native',
161 array(preg_split('//', $text1),
162 preg_split('//', $text2)));
164 /* We want to split on word boundaries, but we need to preserve
165 * whitespace as well. Therefore we split on words, but include
166 * all blocks of whitespace in the wordlist. */
167 $diff = new Text_Diff('native',
168 array($this->_splitOnWords($text1, $nl),
169 $this->_splitOnWords($text2, $nl)));
172 /* Get the diff in inline format. */
173 $renderer = new Text_Diff_Renderer_inline
174 (array_merge($this->getParams(),
175 array('split_level' => $this->_split_characters ? 'characters' : 'words')));
177 /* Run the diff and get the output. */
178 return str_replace($nl, "\n", $renderer->render($diff)) . "\n";
181 function _splitOnWords($string, $newlineEscape = "\n")
183 // Ignore \0; otherwise the while loop will never finish.
184 $string = str_replace("\0", '', $string);
187 $length = strlen($string);
190 while ($pos < $length) {
191 // Eat a word with any preceding whitespace.
192 $spaces = strspn(substr($string, $pos), " \n");
193 $nextpos = strcspn(substr($string, $pos + $spaces), " \n");
194 $words[] = str_replace("\n", $newlineEscape, substr($string, $pos, $spaces + $nextpos));
195 $pos += $spaces + $nextpos;
201 function _encode(&$string)
203 $string = htmlspecialchars($string);