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<?php /** * Base renderer for rendering HTML based diffs for PHP DiffLib. * * PHP version 5 * * Copyright (c) 2009 Chris Boulton <chris.boulton@interspire.com> * * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * - Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * - Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * - Neither the name of the Chris Boulton nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * * @package DiffLib * @author Chris Boulton <chris.boulton@interspire.com> * @copyright (c) 2009 Chris Boulton * @license New BSD License http://www.opensource.org/licenses/bsd-license.php * @version 1.1 * @link http://github.com/chrisboulton/php-diff */ require_once(dirname(__FILE__) . '/../Abstract.php'); class Diff_Renderer_Html_Array extends Diff_Renderer_Abstract { /** * @var array Array of the default options that apply to this renderer. */ protected $defaultOptions = array( 'tabSize' => 4 ); /** * Render and return an array structure suitable for generating HTML * based differences. Generally called by subclasses that generate a * HTML based diff and return an array of the changes to show in the diff. * * @return array An array of the generated chances, suitable for presentation in HTML. */ public function render() { // As we'll be modifying a & b to include our change markers, // we need to get the contents and store them here. That way // we're not going to destroy the original data $a = $this->diff->getA(); $b = $this->diff->getB(); $changes = array(); $opCodes = $this->diff->getGroupedOpcodes(); foreach($opCodes as $group) { $blocks = array(); $lastTag = null; $lastBlock = 0; foreach($group as $code) { list($tag, $i1, $i2, $j1, $j2) = $code; if($tag == 'replace' && $i2 - $i1 == $j2 - $j1) { for($i = 0; $i < ($i2 - $i1); ++$i) { $fromLine = $a[$i1 + $i]; $toLine = $b[$j1 + $i]; list($start, $end) = $this->getChangeExtent($fromLine, $toLine); if($start != 0 || $end != 0) { $last = $end + strlen($fromLine); $fromLine = substr_replace($fromLine, "\0", $start, 0); $fromLine = substr_replace($fromLine, "\1", $last + 1, 0); $last = $end + strlen($toLine); $toLine = substr_replace($toLine, "\0", $start, 0); $toLine = substr_replace($toLine, "\1", $last + 1, 0); $a[$i1 + $i] = $fromLine; $b[$j1 + $i] = $toLine; } } } if($tag != $lastTag) { $blocks[] = array( 'tag' => $tag, 'base' => array( 'offset' => $i1, 'lines' => array() ), 'changed' => array( 'offset' => $j1, 'lines' => array() ) ); $lastBlock = count($blocks)-1; } $lastTag = $tag; if($tag == 'equal') { $lines = array_slice($a, $i1, ($i2 - $i1)); $blocks[$lastBlock]['base']['lines'] += $this->formatLines($lines); $lines = array_slice($b, $j1, ($j2 - $j1)); $blocks[$lastBlock]['changed']['lines'] += $this->formatLines($lines); } else { if($tag == 'replace' || $tag == 'delete') { $lines = array_slice($a, $i1, ($i2 - $i1)); $lines = $this->formatLines($lines); $lines = str_replace(array("\0", "\1"), array('<del>', '</del>'), $lines); $blocks[$lastBlock]['base']['lines'] += $lines; } if($tag == 'replace' || $tag == 'insert') { $lines = array_slice($b, $j1, ($j2 - $j1)); $lines = $this->formatLines($lines); $lines = str_replace(array("\0", "\1"), array('<ins>', '</ins>'), $lines); $blocks[$lastBlock]['changed']['lines'] += $lines; } } } $changes[] = $blocks; } return $changes; } /** * Given two strings, determine where the changes in the two strings * begin, and where the changes in the two strings end. * * @param string $fromLine The first string. * @param string $toLine The second string. * @return array Array containing the starting position (0 by default) and the ending position (-1 by default) */ private function getChangeExtent($fromLine, $toLine) { $start = 0; $limit = min(strlen($fromLine), strlen($toLine)); while($start < $limit && $fromLine[$start] == $toLine[$start]) { ++$start; } $end = -1; $limit = $limit - $start; while(-$end <= $limit && substr($fromLine, $end, 1) == substr($toLine, $end, 1)) { --$end; } return array( $start, $end + 1 ); } /** * Format a series of lines suitable for output in a HTML rendered diff. * This involves replacing tab characters with spaces, making the HTML safe * for output, ensuring that double spaces are replaced with etc. * * @param array $lines Array of lines to format. * @return array Array of the formatted lines. */ private function formatLines($lines) { $lines = array_map(array($this, 'ExpandTabs'), $lines); $lines = array_map(array($this, 'HtmlSafe'), $lines); foreach($lines as &$line) { $line = preg_replace_callback('# ( +)|^ #', array($this, 'fixSpacesCallback'), $line); } return $lines; } /** * Using a callback here instead of the /e modifier in preg_replace (now deprecated). * * @param $matches * @return string */ private function fixSpacesCallback($matches) { $spaces = (isset($matches[1]) ? $matches[1] : ''); return $this->fixSpaces($spaces); } /** * Replace a string containing spaces with a HTML representation using . * * @param string $spaces The string of spaces. * @return string The HTML representation of the string. */ function fixSpaces($spaces='') { $count = strlen($spaces); if($count == 0) { return ''; } $div = floor($count / 2); $mod = $count % 2; return str_repeat(' ', $div).str_repeat(' ', $mod); } /** * Replace tabs in a single line with a number of spaces as defined by the tabSize option. * * @param string $line The containing tabs to convert. * @return string The line with the tabs converted to spaces. */ private function expandTabs($line) { return str_replace("\t", str_repeat(' ', $this->options['tabSize']), $line); } /** * Make a string containing HTML safe for output on a page. * * @param string $string The string. * @return string The string with the HTML characters replaced by entities. */ private function htmlSafe($string) { return @htmlspecialchars($string, ENT_NOQUOTES, 'UTF-8'); } }
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