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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');
}
}