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<?php

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/**

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* "Inline" diff renderer.

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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 https://opensource.org/license/lgpl-2-1/.

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* @author Ciprian Popovici

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* @package Text_Diff

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/** Text_Diff_Renderer */

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// WP #7391

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require_once dirname(dirname(__FILE__)) . '/Renderer.php';

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/**

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* "Inline" diff renderer.

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* This class renders diffs in the Wiki-style "inline" format.

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* @author Ciprian Popovici

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* @package Text_Diff

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class Text_Diff_Renderer_inline extends Text_Diff_Renderer {

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/**

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* Number of leading context "lines" to preserve.

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* @var integer

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var $_leading_context_lines = 10000;

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/**

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* Number of trailing context "lines" to preserve.

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* @var integer

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var $_trailing_context_lines = 10000;

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/**

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* Prefix for inserted text.

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* @var string

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var $_ins_prefix = '<ins>';

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/**

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* Suffix for inserted text.

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* @var string

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var $_ins_suffix = '</ins>';

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/**

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* Prefix for deleted text.

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* @var string

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var $_del_prefix = '<del>';

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/**

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* Suffix for deleted text.

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* @var string

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var $_del_suffix = '</del>';

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/**

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* Header for each change block.

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* @var string

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var $_block_header = '';

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/**

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* Whether to split down to character-level.

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* @var boolean

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var $_split_characters = false;

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/**

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* What are we currently splitting on? Used to recurse to show word-level

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* or character-level changes.

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* @var string

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var $_split_level = 'lines';

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function _blockHeader($xbeg, $xlen, $ybeg, $ylen)

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{

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return $this->_block_header;

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}

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function _startBlock($header)

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{

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return $header;

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}

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function _lines($lines, $prefix = ' ', $encode = true)

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{

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if ($encode) {

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array_walk($lines, array(&$this, '_encode'));

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}

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if ($this->_split_level == 'lines') {

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return implode("\n", $lines) . "\n";

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} else {

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return implode('', $lines);

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}

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}

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function _added($lines)

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{

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array_walk($lines, array(&$this, '_encode'));

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$lines[0] = $this->_ins_prefix . $lines[0];

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$lines[count($lines) - 1] .= $this->_ins_suffix;

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return $this->_lines($lines, ' ', false);

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}

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function _deleted($lines, $words = false)

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{

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array_walk($lines, array(&$this, '_encode'));

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$lines[0] = $this->_del_prefix . $lines[0];

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$lines[count($lines) - 1] .= $this->_del_suffix;

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return $this->_lines($lines, ' ', false);

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}

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function _changed($orig, $final)

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{

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/* If we've already split on characters, just display. */

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if ($this->_split_level == 'characters') {

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return $this->_deleted($orig)

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. $this->_added($final);

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}

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/* If we've already split on words, just display. */

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if ($this->_split_level == 'words') {

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$prefix = '';

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while ($orig[0] !== false && $final[0] !== false &&

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substr($orig[0], 0, 1) == ' ' &&

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substr($final[0], 0, 1) == ' ') {

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$prefix .= substr($orig[0], 0, 1);

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$orig[0] = substr($orig[0], 1);

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$final[0] = substr($final[0], 1);

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}

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return $prefix . $this->_deleted($orig) . $this->_added($final);

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}

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$text1 = implode("\n", $orig);

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$text2 = implode("\n", $final);

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/* Non-printing newline marker. */

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$nl = "\0";

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if ($this->_split_characters) {

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$diff = new Text_Diff('native',

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array(preg_split('//', $text1),

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preg_split('//', $text2)));

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} else {

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/* We want to split on word boundaries, but we need to preserve

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* whitespace as well. Therefore we split on words, but include

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* all blocks of whitespace in the wordlist. */

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$diff = new Text_Diff('native',

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array($this->_splitOnWords($text1, $nl),

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$this->_splitOnWords($text2, $nl)));

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}

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/* Get the diff in inline format. */

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$renderer = new Text_Diff_Renderer_inline

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(array_merge($this->getParams(),

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array('split_level' => $this->_split_characters ? 'characters' : 'words')));

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/* Run the diff and get the output. */

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return str_replace($nl, "\n", $renderer->render($diff)) . "\n";

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}

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function _splitOnWords($string, $newlineEscape = "\n")

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{

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// Ignore \0; otherwise the while loop will never finish.

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$string = str_replace("\0", '', $string);

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$words = array();

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$length = strlen($string);

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$pos = 0;

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while ($pos < $length) {

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// Eat a word with any preceding whitespace.

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$spaces = strspn(substr($string, $pos), " \n");

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$nextpos = strcspn(substr($string, $pos + $spaces), " \n");

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$words[] = str_replace("\n", $newlineEscape, substr($string, $pos, $spaces + $nextpos));

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$pos += $spaces + $nextpos;

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}

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return $words;

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}

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function _encode(&$string)

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{

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$string = htmlspecialchars($string);

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}

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}

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