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<?php

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/**

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* Diff

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* A comprehensive library for generating differences between two strings

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* in multiple formats (unified, side by side HTML etc)

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* PHP version 5

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* Redistribution and use in source and binary forms, with or without

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* modification, are permitted provided that the following conditions are met:

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* - Redistributions of source code must retain the above copyright notice,

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* this list of conditions and the following disclaimer.

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* - Redistributions in binary form must reproduce the above copyright notice,

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* this list of conditions and the following disclaimer in the documentation

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* and/or other materials provided with the distribution.

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* - Neither the name of the Chris Boulton nor the names of its contributors

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* may be used to endorse or promote products derived from this software

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* without specific prior written permission.

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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE

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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

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* POSSIBILITY OF SUCH DAMAGE.

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* @package Diff

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* @author Chris Boulton <chris.boulton@interspire.com>

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* @license New BSD License http://www.opensource.org/licenses/bsd-license.php

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* @version 1.1

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* @link http://github.com/chrisboulton/php-diff

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class Diff

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{

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/**

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* @var array The "old" sequence to use as the basis for the comparison.

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private $a = null;

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/**

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* @var array The "new" sequence to generate the changes for.

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private $b = null;

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/**

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* @var array Array containing the generated opcodes for the differences between the two items.

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private $groupedCodes = null;

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/**

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* @var array Associative array of the default options available for the diff class and their default value.

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private $defaultOptions = array(

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'context' => 3,

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'ignoreNewLines' => false,

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'ignoreWhitespace' => false,

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'ignoreCase' => false

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);

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/**

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* @var array Array of the options that have been applied for generating the diff.

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private $options = array();

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/**

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* The constructor.

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* @param array $a Array containing the lines of the first string to compare.

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* @param array $b Array containing the lines for the second string to compare.

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public function __construct($a, $b, $options=array())

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{

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$this->a = $a;

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$this->b = $b;

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$this->options = array_merge($this->defaultOptions, $options);

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}

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/**

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* Render a diff using the supplied rendering class and return it.

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* @param object $renderer An instance of the rendering object to use for generating the diff.

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* @return mixed The generated diff. Exact return value depends on the rendered.

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public function render(Diff_Renderer_Abstract $renderer)

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{

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$renderer->diff = $this;

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return $renderer->render();

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}

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/**

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* Get a range of lines from $start to $end from the first comparison string

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* and return them as an array. If no values are supplied, the entire string

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* is returned. It's also possible to specify just one line to return only

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* that line.

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* @param int $start The starting number.

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* @param int $end The ending number. If not supplied, only the item in $start will be returned.

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* @return array Array of all of the lines between the specified range.

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public function getA($start=0, $end=null)

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{

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if($start == 0 && $end === null) {

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return $this->a;

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}

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if($end === null) {

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$length = 1;

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}

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else {

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$length = $end - $start;

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}

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return array_slice($this->a, $start, $length);

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}

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/**

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* Get a range of lines from $start to $end from the second comparison string

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* and return them as an array. If no values are supplied, the entire string

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* is returned. It's also possible to specify just one line to return only

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* that line.

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* @param int $start The starting number.

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* @param int $end The ending number. If not supplied, only the item in $start will be returned.

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* @return array Array of all of the lines between the specified range.

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public function getB($start=0, $end=null)

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{

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if($start == 0 && $end === null) {

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return $this->b;

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}

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if($end === null) {

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$length = 1;

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}

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else {

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$length = $end - $start;

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}

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return array_slice($this->b, $start, $length);

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}

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/**

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* Generate a list of the compiled and grouped opcodes for the differences between the

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* two strings. Generally called by the renderer, this class instantiates the sequence

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* matcher and performs the actual diff generation and return an array of the opcodes

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* for it. Once generated, the results are cached in the diff class instance.

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* @return array Array of the grouped opcodes for the generated diff.

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public function getGroupedOpcodes()

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{

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if(!is_null($this->groupedCodes)) {

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return $this->groupedCodes;

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}

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require_once(dirname(__FILE__) . '/Diff/SequenceMatcher.php');

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$sequenceMatcher = new Diff_SequenceMatcher($this->a, $this->b, null, $this->options);

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$this->groupedCodes = $sequenceMatcher->getGroupedOpcodes();

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return $this->groupedCodes;

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}

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}

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