630 lines
20 KiB
PHP
630 lines
20 KiB
PHP
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<?php
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namespace Caxy\HtmlDiff;
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class HtmlDiff
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{
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public static $defaultSpecialCaseTags = array('strong', 'b', 'i', 'big', 'small', 'u', 'sub', 'sup', 'strike', 's', 'p');
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public static $defaultSpecialCaseChars = array('.', ',', '(', ')', '\'');
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public static $defaultGroupDiffs = true;
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protected $content;
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protected $oldText;
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protected $newText;
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protected $oldWords = array();
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protected $newWords = array();
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protected $wordIndices;
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protected $encoding;
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protected $specialCaseOpeningTags = array();
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protected $specialCaseClosingTags = array();
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protected $specialCaseTags;
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protected $specialCaseChars;
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protected $groupDiffs;
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protected $insertSpaceInReplace = false;
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public function __construct($oldText, $newText, $encoding = 'UTF-8', $specialCaseTags = null, $groupDiffs = null)
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{
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if ($specialCaseTags === null) {
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$specialCaseTags = static::$defaultSpecialCaseTags;
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}
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if ($groupDiffs === null) {
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$groupDiffs = static::$defaultGroupDiffs;
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}
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$this->oldText = $this->purifyHtml(trim($oldText));
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$this->newText = $this->purifyHtml(trim($newText));
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$this->encoding = $encoding;
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$this->content = '';
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$this->groupDiffs = $groupDiffs;
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$this->setSpecialCaseTags($specialCaseTags);
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$this->setSpecialCaseChars(static::$defaultSpecialCaseChars);
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}
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/**
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* @param boolean $boolean
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* @return HtmlDiff
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*/
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public function setInsertSpaceInReplace($boolean)
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{
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$this->insertSpaceInReplace = $boolean;
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return $this;
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}
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/**
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* @return boolean
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*/
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public function getInsertSpaceInReplace()
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{
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return $this->insertSpaceInReplace;
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}
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public function setSpecialCaseChars(array $chars)
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{
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$this->specialCaseChars = $chars;
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}
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public function getSpecialCaseChars()
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{
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return $this->specialCaseChars;
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}
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public function addSpecialCaseChar($char)
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{
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if (!in_array($char, $this->specialCaseChars)) {
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$this->specialCaseChars[] = $char;
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}
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}
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public function removeSpecialCaseChar($char)
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{
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$key = array_search($char, $this->specialCaseChars);
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if ($key !== false) {
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unset($this->specialCaseChars[$key]);
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}
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}
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public function setSpecialCaseTags(array $tags = array())
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{
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$this->specialCaseTags = $tags;
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foreach ($this->specialCaseTags as $tag) {
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$this->addSpecialCaseTag($tag);
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}
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}
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public function addSpecialCaseTag($tag)
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{
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if (!in_array($tag, $this->specialCaseTags)) {
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$this->specialCaseTags[] = $tag;
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}
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$opening = $this->getOpeningTag($tag);
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$closing = $this->getClosingTag($tag);
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if (!in_array($opening, $this->specialCaseOpeningTags)) {
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$this->specialCaseOpeningTags[] = $opening;
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}
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if (!in_array($closing, $this->specialCaseClosingTags)) {
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$this->specialCaseClosingTags[] = $closing;
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}
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}
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public function removeSpecialCaseTag($tag)
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{
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if (($key = array_search($tag, $this->specialCaseTags)) !== false) {
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unset($this->specialCaseTags[$key]);
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$opening = $this->getOpeningTag($tag);
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$closing = $this->getClosingTag($tag);
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if (($key = array_search($opening, $this->specialCaseOpeningTags)) !== false) {
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unset($this->specialCaseOpeningTags[$key]);
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}
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if (($key = array_search($closing, $this->specialCaseClosingTags)) !== false) {
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unset($this->specialCaseClosingTags[$key]);
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}
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}
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}
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public function getSpecialCaseTags()
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{
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return $this->specialCaseTags;
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}
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public function getOldHtml()
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{
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return $this->oldText;
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}
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public function getNewHtml()
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{
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return $this->newText;
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}
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public function getDifference()
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{
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return $this->content;
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}
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public function setGroupDiffs($boolean)
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{
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$this->groupDiffs = $boolean;
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}
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public function isGroupDiffs()
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{
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return $this->groupDiffs;
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}
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protected function getOpeningTag($tag)
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{
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return "/<".$tag."[^>]*/i";
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}
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protected function getClosingTag($tag)
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{
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return "</".$tag.">";
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}
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protected function getStringBetween($str, $start, $end)
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{
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$expStr = explode( $start, $str, 2 );
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if ( count( $expStr ) > 1 ) {
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$expStr = explode( $end, $expStr[ 1 ] );
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if ( count( $expStr ) > 1 ) {
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array_pop( $expStr );
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return implode( $end, $expStr );
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}
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}
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return '';
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}
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protected function purifyHtml($html, $tags = null)
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{
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if ( class_exists( 'Tidy' ) && false ) {
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$config = array( 'output-xhtml' => true, 'indent' => false );
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$tidy = new tidy;
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$tidy->parseString( $html, $config, 'utf8' );
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$html = (string) $tidy;
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return $this->getStringBetween( $html, '<body>' );
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}
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return $html;
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}
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public function build()
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{
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$this->splitInputsToWords();
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$this->indexNewWords();
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$operations = $this->operations();
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foreach ($operations as $item) {
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$this->performOperation( $item );
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}
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return $this->content;
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}
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protected function indexNewWords()
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{
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$this->wordIndices = array();
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foreach ($this->newWords as $i => $word) {
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if ( $this->isTag( $word ) ) {
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$word = $this->stripTagAttributes( $word );
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}
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if ( isset( $this->wordIndices[ $word ] ) ) {
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$this->wordIndices[ $word ][] = $i;
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} else {
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$this->wordIndices[ $word ] = array( $i );
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}
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}
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}
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protected function splitInputsToWords()
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{
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$this->oldWords = $this->convertHtmlToListOfWords( $this->explode( $this->oldText ) );
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$this->newWords = $this->convertHtmlToListOfWords( $this->explode( $this->newText ) );
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}
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protected function isPartOfWord($text)
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{
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return ctype_alnum(str_replace($this->specialCaseChars, '', $text));
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}
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protected function convertHtmlToListOfWords($characterString)
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{
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$mode = 'character';
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$current_word = '';
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$words = array();
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foreach ($characterString as $i => $character) {
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switch ($mode) {
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case 'character':
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if ( $this->isStartOfTag( $character ) ) {
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if ($current_word != '') {
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$words[] = $current_word;
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}
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$current_word = "<";
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$mode = 'tag';
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} elseif ( preg_match( "[^\s]", $character ) > 0 ) {
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if ($current_word != '') {
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$words[] = $current_word;
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}
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$current_word = $character;
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$mode = 'whitespace';
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} else {
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if (
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(ctype_alnum($character) && (strlen($current_word) == 0 || $this->isPartOfWord($current_word))) ||
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(in_array($character, $this->specialCaseChars) && isset($characterString[$i+1]) && $this->isPartOfWord($characterString[$i+1]))
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) {
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$current_word .= $character;
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} else {
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$words[] = $current_word;
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$current_word = $character;
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}
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}
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break;
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case 'tag' :
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if ( $this->isEndOfTag( $character ) ) {
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$current_word .= ">";
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$words[] = $current_word;
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$current_word = "";
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if ( !preg_match('[^\s]', $character ) ) {
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$mode = 'whitespace';
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} else {
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$mode = 'character';
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}
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} else {
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$current_word .= $character;
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}
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break;
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case 'whitespace':
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if ( $this->isStartOfTag( $character ) ) {
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if ($current_word != '') {
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$words[] = $current_word;
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}
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$current_word = "<";
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$mode = 'tag';
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} elseif ( preg_match( "[^\s]", $character ) ) {
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$current_word .= $character;
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} else {
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if ($current_word != '') {
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$words[] = $current_word;
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}
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$current_word = $character;
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$mode = 'character';
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}
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break;
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default:
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break;
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}
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}
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if ($current_word != '') {
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$words[] = $current_word;
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}
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return $words;
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}
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protected function isStartOfTag($val)
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{
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return $val == "<";
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}
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protected function isEndOfTag($val)
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{
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return $val == ">";
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}
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protected function isWhiteSpace($value)
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{
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return !preg_match( '[^\s]', $value );
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}
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protected function explode($value)
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{
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// as suggested by @onassar
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return preg_split( '//u', $value );
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}
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protected function performOperation($operation)
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{
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switch ($operation->action) {
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case 'equal' :
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$this->processEqualOperation( $operation );
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break;
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case 'delete' :
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$this->processDeleteOperation( $operation, "diffdel" );
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break;
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case 'insert' :
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$this->processInsertOperation( $operation, "diffins");
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break;
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case 'replace':
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$this->processReplaceOperation( $operation );
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break;
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default:
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break;
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}
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}
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protected function processReplaceOperation($operation)
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{
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$processDelete = strlen($this->oldText) > 0;
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$processInsert = strlen($this->newText) > 0;
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if ($processDelete) {
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$this->processDeleteOperation( $operation, "diffmod" );
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}
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if ($this->insertSpaceInReplace && $processDelete && $processInsert) {
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$this->content .= ' ';
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}
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if ($processInsert) {
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$this->processInsertOperation( $operation, "diffmod" );
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}
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}
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protected function processInsertOperation($operation, $cssClass)
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{
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$text = array();
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foreach ($this->newWords as $pos => $s) {
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if ($pos >= $operation->startInNew && $pos < $operation->endInNew) {
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$text[] = $s;
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}
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}
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$this->insertTag( "ins", $cssClass, $text );
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}
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protected function processDeleteOperation($operation, $cssClass)
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{
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$text = array();
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foreach ($this->oldWords as $pos => $s) {
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if ($pos >= $operation->startInOld && $pos < $operation->endInOld) {
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$text[] = $s;
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}
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}
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$this->insertTag( "del", $cssClass, $text );
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}
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protected function processEqualOperation($operation)
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{
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$result = array();
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foreach ($this->newWords as $pos => $s) {
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if ($pos >= $operation->startInNew && $pos < $operation->endInNew) {
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$result[] = $s;
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}
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}
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$this->content .= implode( "", $result );
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}
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protected function insertTag($tag, $cssClass, &$words)
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{
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while (true) {
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if ( count( $words ) == 0 ) {
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break;
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}
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|
|
$nonTags = $this->extractConsecutiveWords( $words, 'noTag' );
|
||
|
|
|
||
|
|
$specialCaseTagInjection = '';
|
||
|
|
$specialCaseTagInjectionIsBefore = false;
|
||
|
|
|
||
|
|
if ( count( $nonTags ) != 0 ) {
|
||
|
|
$text = $this->wrapText( implode( "", $nonTags ), $tag, $cssClass );
|
||
|
|
$this->content .= $text;
|
||
|
|
} else {
|
||
|
|
$firstOrDefault = false;
|
||
|
|
foreach ($this->specialCaseOpeningTags as $x) {
|
||
|
|
if ( preg_match( $x, $words[ 0 ] ) ) {
|
||
|
|
$firstOrDefault = $x;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if ($firstOrDefault) {
|
||
|
|
$specialCaseTagInjection = '<ins class="mod">';
|
||
|
|
if ($tag == "del") {
|
||
|
|
unset( $words[ 0 ] );
|
||
|
|
}
|
||
|
|
} elseif ( array_search( $words[ 0 ], $this->specialCaseClosingTags ) !== false ) {
|
||
|
|
$specialCaseTagInjection = "</ins>";
|
||
|
|
$specialCaseTagInjectionIsBefore = true;
|
||
|
|
if ($tag == "del") {
|
||
|
|
unset( $words[ 0 ] );
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if ( count( $words ) == 0 && count( $specialCaseTagInjection ) == 0 ) {
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
if ($specialCaseTagInjectionIsBefore) {
|
||
|
|
$this->content .= $specialCaseTagInjection . implode( "", $this->extractConsecutiveWords( $words, 'tag' ) );
|
||
|
|
} else {
|
||
|
|
$workTag = $this->extractConsecutiveWords( $words, 'tag' );
|
||
|
|
if ( isset( $workTag[ 0 ] ) && $this->isOpeningTag( $workTag[ 0 ] ) && !$this->isClosingTag( $workTag[ 0 ] ) ) {
|
||
|
|
if ( strpos( $workTag[ 0 ], 'class=' ) ) {
|
||
|
|
$workTag[ 0 ] = str_replace( 'class="', 'class="diffmod ', $workTag[ 0 ] );
|
||
|
|
$workTag[ 0 ] = str_replace( "class='", 'class="diffmod ', $workTag[ 0 ] );
|
||
|
|
} else {
|
||
|
|
$workTag[ 0 ] = str_replace( ">", ' class="diffmod">', $workTag[ 0 ] );
|
||
|
|
}
|
||
|
|
}
|
||
|
|
$this->content .= implode( "", $workTag ) . $specialCaseTagInjection;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
protected function checkCondition($word, $condition)
|
||
|
|
{
|
||
|
|
return $condition == 'tag' ? $this->isTag( $word ) : !$this->isTag( $word );
|
||
|
|
}
|
||
|
|
|
||
|
|
protected function wrapText($text, $tagName, $cssClass)
|
||
|
|
{
|
||
|
|
return sprintf( '<%1$s class="%2$s">%3$s</%1$s>', $tagName, $cssClass, $text );
|
||
|
|
}
|
||
|
|
|
||
|
|
protected function extractConsecutiveWords(&$words, $condition)
|
||
|
|
{
|
||
|
|
$indexOfFirstTag = null;
|
||
|
|
foreach ($words as $i => $word) {
|
||
|
|
if ( !$this->checkCondition( $word, $condition ) ) {
|
||
|
|
$indexOfFirstTag = $i;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if ($indexOfFirstTag !== null) {
|
||
|
|
$items = array();
|
||
|
|
foreach ($words as $pos => $s) {
|
||
|
|
if ($pos >= 0 && $pos < $indexOfFirstTag) {
|
||
|
|
$items[] = $s;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if ($indexOfFirstTag > 0) {
|
||
|
|
array_splice( $words, 0, $indexOfFirstTag );
|
||
|
|
}
|
||
|
|
|
||
|
|
return $items;
|
||
|
|
} else {
|
||
|
|
$items = array();
|
||
|
|
foreach ($words as $pos => $s) {
|
||
|
|
if ( $pos >= 0 && $pos <= count( $words ) ) {
|
||
|
|
$items[] = $s;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
array_splice( $words, 0, count( $words ) );
|
||
|
|
|
||
|
|
return $items;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
protected function isTag($item)
|
||
|
|
{
|
||
|
|
return $this->isOpeningTag( $item ) || $this->isClosingTag( $item );
|
||
|
|
}
|
||
|
|
|
||
|
|
protected function isOpeningTag($item)
|
||
|
|
{
|
||
|
|
return preg_match( "#<[^>]+>\\s*#iU", $item );
|
||
|
|
}
|
||
|
|
|
||
|
|
protected function isClosingTag($item)
|
||
|
|
{
|
||
|
|
return preg_match( "#</[^>]+>\\s*#iU", $item );
|
||
|
|
}
|
||
|
|
|
||
|
|
protected function operations()
|
||
|
|
{
|
||
|
|
$positionInOld = 0;
|
||
|
|
$positionInNew = 0;
|
||
|
|
$operations = array();
|
||
|
|
$matches = $this->matchingBlocks();
|
||
|
|
$matches[] = new Match( count( $this->oldWords ), count( $this->newWords ), 0 );
|
||
|
|
foreach ($matches as $i => $match) {
|
||
|
|
$matchStartsAtCurrentPositionInOld = ( $positionInOld == $match->startInOld );
|
||
|
|
$matchStartsAtCurrentPositionInNew = ( $positionInNew == $match->startInNew );
|
||
|
|
$action = 'none';
|
||
|
|
|
||
|
|
if ($matchStartsAtCurrentPositionInOld == false && $matchStartsAtCurrentPositionInNew == false) {
|
||
|
|
$action = 'replace';
|
||
|
|
} elseif ($matchStartsAtCurrentPositionInOld == true && $matchStartsAtCurrentPositionInNew == false) {
|
||
|
|
$action = 'insert';
|
||
|
|
} elseif ($matchStartsAtCurrentPositionInOld == false && $matchStartsAtCurrentPositionInNew == true) {
|
||
|
|
$action = 'delete';
|
||
|
|
} else { // This occurs if the first few words are the same in both versions
|
||
|
|
$action = 'none';
|
||
|
|
}
|
||
|
|
if ($action != 'none') {
|
||
|
|
$operations[] = new Operation( $action, $positionInOld, $match->startInOld, $positionInNew, $match->startInNew );
|
||
|
|
}
|
||
|
|
if ( count( $match ) != 0 ) {
|
||
|
|
$operations[] = new Operation( 'equal', $match->startInOld, $match->endInOld(), $match->startInNew, $match->endInNew() );
|
||
|
|
}
|
||
|
|
$positionInOld = $match->endInOld();
|
||
|
|
$positionInNew = $match->endInNew();
|
||
|
|
}
|
||
|
|
|
||
|
|
return $operations;
|
||
|
|
}
|
||
|
|
|
||
|
|
protected function matchingBlocks()
|
||
|
|
{
|
||
|
|
$matchingBlocks = array();
|
||
|
|
$this->findMatchingBlocks( 0, count( $this->oldWords ), 0, count( $this->newWords ), $matchingBlocks );
|
||
|
|
|
||
|
|
return $matchingBlocks;
|
||
|
|
}
|
||
|
|
|
||
|
|
protected function findMatchingBlocks($startInOld, $endInOld, $startInNew, $endInNew, &$matchingBlocks)
|
||
|
|
{
|
||
|
|
$match = $this->findMatch( $startInOld, $endInOld, $startInNew, $endInNew );
|
||
|
|
if ($match !== null) {
|
||
|
|
if ($startInOld < $match->startInOld && $startInNew < $match->startInNew) {
|
||
|
|
$this->findMatchingBlocks( $startInOld, $match->startInOld, $startInNew, $match->startInNew, $matchingBlocks );
|
||
|
|
}
|
||
|
|
$matchingBlocks[] = $match;
|
||
|
|
if ( $match->endInOld() < $endInOld && $match->endInNew() < $endInNew ) {
|
||
|
|
$this->findMatchingBlocks( $match->endInOld(), $endInOld, $match->endInNew(), $endInNew, $matchingBlocks );
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
protected function stripTagAttributes($word)
|
||
|
|
{
|
||
|
|
$word = explode( ' ', trim( $word, '<>' ) );
|
||
|
|
|
||
|
|
return '<' . $word[ 0 ] . '>';
|
||
|
|
}
|
||
|
|
|
||
|
|
protected function findMatch($startInOld, $endInOld, $startInNew, $endInNew)
|
||
|
|
{
|
||
|
|
$bestMatchInOld = $startInOld;
|
||
|
|
$bestMatchInNew = $startInNew;
|
||
|
|
$bestMatchSize = 0;
|
||
|
|
$matchLengthAt = array();
|
||
|
|
for ($indexInOld = $startInOld; $indexInOld < $endInOld; $indexInOld++) {
|
||
|
|
$newMatchLengthAt = array();
|
||
|
|
$index = $this->oldWords[ $indexInOld ];
|
||
|
|
if ( $this->isTag( $index ) ) {
|
||
|
|
$index = $this->stripTagAttributes( $index );
|
||
|
|
}
|
||
|
|
if ( !isset( $this->wordIndices[ $index ] ) ) {
|
||
|
|
$matchLengthAt = $newMatchLengthAt;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
foreach ($this->wordIndices[ $index ] as $indexInNew) {
|
||
|
|
if ($indexInNew < $startInNew) {
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
if ($indexInNew >= $endInNew) {
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
$newMatchLength = ( isset( $matchLengthAt[ $indexInNew - 1 ] ) ? $matchLengthAt[ $indexInNew - 1 ] : 0 ) + 1;
|
||
|
|
$newMatchLengthAt[ $indexInNew ] = $newMatchLength;
|
||
|
|
if ($newMatchLength > $bestMatchSize) {
|
||
|
|
$bestMatchInOld = $indexInOld - $newMatchLength + 1;
|
||
|
|
$bestMatchInNew = $indexInNew - $newMatchLength + 1;
|
||
|
|
$bestMatchSize = $newMatchLength;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
$matchLengthAt = $newMatchLengthAt;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Skip match if none found or match consists only of whitespace
|
||
|
|
if ($bestMatchSize != 0 &&
|
||
|
|
(
|
||
|
|
!$this->isGroupDiffs() ||
|
||
|
|
!preg_match('/^\s+$/', implode('', array_slice($this->oldWords, $bestMatchInOld, $bestMatchSize)))
|
||
|
|
)
|
||
|
|
) {
|
||
|
|
return new Match($bestMatchInOld, $bestMatchInNew, $bestMatchSize);
|
||
|
|
}
|
||
|
|
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
}
|