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<?php
/**
* Diff
*
* A comprehensive library for generating differences between two strings
* in multiple formats (unified, side by side HTML etc)
*
* 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 Diff
* @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
*/
class Diff
{
/**
* @var array The "old" sequence to use as the basis for the comparison.
*/
private $a = null;
/**
* @var array The "new" sequence to generate the changes for.
*/
private $b = null;
/**
* @var array Array containing the generated opcodes for the differences between the two items.
*/
private $groupedCodes = null;
/**
* @var array Associative array of the default options available for the diff class and their default value.
*/
private $defaultOptions = array(
'context' => 3,
'ignoreNewLines' => false,
'ignoreWhitespace' => false,
'ignoreCase' => false
);
/**
* @var array Array of the options that have been applied for generating the diff.
*/
private $options = array();
/**
* The constructor.
*
* @param array $a Array containing the lines of the first string to compare.
* @param array $b Array containing the lines for the second string to compare.
*/
public function __construct($a, $b, $options=array())
{
$this->a = $a;
$this->b = $b;
$this->options = array_merge($this->defaultOptions, $options);
}
/**
* Render a diff using the supplied rendering class and return it.
*
* @param object $renderer An instance of the rendering object to use for generating the diff.
* @return mixed The generated diff. Exact return value depends on the rendered.
*/
public function render(Diff_Renderer_Abstract $renderer)
{
$renderer->diff = $this;
return $renderer->render();
}
/**
* Get a range of lines from $start to $end from the first comparison string
* and return them as an array. If no values are supplied, the entire string
* is returned. It's also possible to specify just one line to return only
* that line.
*
* @param int $start The starting number.
* @param int $end The ending number. If not supplied, only the item in $start will be returned.
* @return array Array of all of the lines between the specified range.
*/
public function getA($start=0, $end=null)
{
if($start == 0 && $end === null) {
return $this->a;
}
if($end === null) {
$length = 1;
}
else {
$length = $end - $start;
}
return array_slice($this->a, $start, $length);
}
/**
* Get a range of lines from $start to $end from the second comparison string
* and return them as an array. If no values are supplied, the entire string
* is returned. It's also possible to specify just one line to return only
* that line.
*
* @param int $start The starting number.
* @param int $end The ending number. If not supplied, only the item in $start will be returned.
* @return array Array of all of the lines between the specified range.
*/
public function getB($start=0, $end=null)
{
if($start == 0 && $end === null) {
return $this->b;
}
if($end === null) {
$length = 1;
}
else {
$length = $end - $start;
}
return array_slice($this->b, $start, $length);
}
/**
* Generate a list of the compiled and grouped opcodes for the differences between the
* two strings. Generally called by the renderer, this class instantiates the sequence
* matcher and performs the actual diff generation and return an array of the opcodes
* for it. Once generated, the results are cached in the diff class instance.
*
* @return array Array of the grouped opcodes for the generated diff.
*/
public function getGroupedOpcodes()
{
if(!is_null($this->groupedCodes)) {
return $this->groupedCodes;
}
require_once(dirname(__FILE__) . '/Diff/SequenceMatcher.php');
$sequenceMatcher = new Diff_SequenceMatcher($this->a, $this->b, null, $this->options);
$this->groupedCodes = $sequenceMatcher->getGroupedOpcodes();
return $this->groupedCodes;
}
}