+++ /dev/null
-<?php
-
-/** Copyright (C) 2008 Guy Van den Broeck <guy@guyvdb.eu>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- * or see http://www.gnu.org/
- *
- */
-
-/**
- * Any element in the DOM tree of an HTML document.
- * @ingroup DifferenceEngine
- */
-class Node {
-
- public $parent;
-
- protected $parentTree;
-
- public $whiteBefore = false;
-
- public $whiteAfter = false;
-
- function __construct($parent) {
- $this->parent = $parent;
- }
-
- public function getParentTree() {
- if (!isset($this->parentTree)) {
- if (!is_null($this->parent)) {
- $this->parentTree = $this->parent->getParentTree();
- $this->parentTree[] = $this->parent;
- } else {
- $this->parentTree = array();
- }
- }
- return $this->parentTree;
- }
-
- public function getLastCommonParent(Node $other) {
- $result = new LastCommonParentResult();
-
- $myParents = $this->getParentTree();
- $otherParents = $other->getParentTree();
-
- $i = 1;
- $isSame = true;
- $nbMyParents = count($myParents);
- $nbOtherParents = count($otherParents);
- while ($isSame && $i < $nbMyParents && $i < $nbOtherParents) {
- if (!$myParents[$i]->openingTag === $otherParents[$i]->openingTag) {
- $isSame = false;
- } else {
- // After a while, the index i-1 must be the last common parent
- $i++;
- }
- }
-
- $result->lastCommonParentDepth = $i - 1;
- $result->parent = $myParents[$i - 1];
-
- if (!$isSame || $nbMyParents > $nbOtherParents) {
- // Not all tags matched, or all tags matched but
- // there are tags left in this tree
- $result->indexInLastCommonParent = $myParents[$i - 1]->getIndexOf($myParents[$i]);
- $result->splittingNeeded = true;
- } else if ($nbMyParents <= $nbOtherParents) {
- $result->indexInLastCommonParent = $myParents[$i - 1]->getIndexOf($this);
- }
- return $result;
- }
-
- public function setParent($parent) {
- $this->parent = $parent;
- unset($this->parentTree);
- }
-
- public function inPre() {
- $tree = $this->getParentTree();
- foreach ($tree as &$ancestor) {
- if ($ancestor->isPre()) {
- return true;
- }
- }
- return false;
- }
-}
-
-/**
- * Node that can contain other nodes. Represents an HTML tag.
- * @ingroup DifferenceEngine
- */
-class TagNode extends Node {
-
- public $children = array();
-
- public $qName;
-
- public $attributes = array();
-
- public $openingTag;
-
- function __construct($parent, $qName, /*array*/ $attributes) {
- parent::__construct($parent);
- $this->qName = strtolower($qName);
- foreach($attributes as $key => &$value){
- $this->attributes[strtolower($key)] = $value;
- }
- return $this->openingTag = Xml::openElement($this->qName, $this->attributes);
- }
-
- public function addChildAbsolute(Node $node, $index) {
- array_splice($this->children, $index, 0, array($node));
- }
-
- public function getIndexOf(Node $child) {
- // don't trust array_search with objects
- foreach ($this->children as $key => &$value){
- if ($value === $child) {
- return $key;
- }
- }
- return null;
- }
-
- public function getNbChildren() {
- return count($this->children);
- }
-
- public function getMinimalDeletedSet($id, &$allDeleted, &$somethingDeleted) {
- $nodes = array();
-
- $allDeleted = false;
- $somethingDeleted = false;
- $hasNonDeletedDescendant = false;
-
- if (empty($this->children)) {
- return $nodes;
- }
-
- foreach ($this->children as &$child) {
- $allDeleted_local = false;
- $somethingDeleted_local = false;
- $childrenChildren = $child->getMinimalDeletedSet($id, $allDeleted_local, $somethingDeleted_local);
- if ($somethingDeleted_local) {
- $nodes = array_merge($nodes, $childrenChildren);
- $somethingDeleted = true;
- }
- if (!$allDeleted_local) {
- $hasNonDeletedDescendant = true;
- }
- }
- if (!$hasNonDeletedDescendant) {
- $nodes = array($this);
- $allDeleted = true;
- }
- return $nodes;
- }
-
- public function splitUntil(TagNode $parent, Node $split, $includeLeft) {
- $splitOccured = false;
- if ($parent !== $this) {
- $part1 = new TagNode(null, $this->qName, $this->attributes);
- $part2 = new TagNode(null, $this->qName, $this->attributes);
- $part1->setParent($this->parent);
- $part2->setParent($this->parent);
-
- $onSplit = false;
- $pastSplit = false;
- foreach ($this->children as &$child)
- {
- if ($child === $split) {
- $onSplit = true;
- }
- if(!$pastSplit || ($onSplit && $includeLeft)) {
- $child->setParent($part1);
- $part1->children[] = $child;
- } else {
- $child->setParent($part2);
- $part2->children[] = $child;
- }
- if ($onSplit) {
- $onSplit = false;
- $pastSplit = true;
- }
- }
- $myindexinparent = $this->parent->getIndexOf($this);
- if (!empty($part1->children)) {
- $this->parent->addChildAbsolute($part1, $myindexinparent);
- }
- if (!empty($part2->children)) {
- $this->parent->addChildAbsolute($part2, $myindexinparent);
- }
- if (!empty($part1->children) && !empty($part2->children)) {
- $splitOccured = true;
- }
-
- $this->parent->removeChild($myindexinparent);
-
- if ($includeLeft) {
- $this->parent->splitUntil($parent, $part1, $includeLeft);
- } else {
- $this->parent->splitUntil($parent, $part2, $includeLeft);
- }
- }
- return $splitOccured;
-
- }
-
- private function removeChild($index) {
- unset($this->children[$index]);
- $this->children = array_values($this->children);
- }
-
- public static $blocks = array('html', 'body','p','blockquote', 'h1',
- 'h2', 'h3', 'h4', 'h5', 'pre', 'div', 'ul', 'ol', 'li', 'table',
- 'tbody', 'tr', 'td', 'th', 'br');
-
- public function copyTree() {
- $newThis = new TagNode(null, $this->qName, $this->attributes);
- $newThis->whiteBefore = $this->whiteBefore;
- $newThis->whiteAfter = $this->whiteAfter;
- foreach ($this->children as &$child) {
- $newChild = $child->copyTree();
- $newChild->setParent($newThis);
- $newThis->children[] = $newChild;
- }
- return $newThis;
- }
-
- public function getMatchRatio(TagNode $other) {
- $txtComp = new TextOnlyComparator($other);
- return $txtComp->getMatchRatio(new TextOnlyComparator($this));
- }
-
- public function expandWhiteSpace() {
- $shift = 0;
- $spaceAdded = false;
-
- $nbOriginalChildren = $this->getNbChildren();
- for ($i = 0; $i < $nbOriginalChildren; ++$i) {
- $child = $this->children[$i + $shift];
-
- if ($child instanceof TagNode) {
- if (!$child->isPre()) {
- $child->expandWhiteSpace();
- }
- }
- if (!$spaceAdded && $child->whiteBefore) {
- $ws = new WhiteSpaceNode(null, ' ', $child->getLeftMostChild());
- $ws->setParent($this);
- $this->addChildAbsolute($ws,$i + ($shift++));
- }
- if ($child->whiteAfter) {
- $ws = new WhiteSpaceNode(null, ' ', $child->getRightMostChild());
- $ws->setParent($this);
- $this->addChildAbsolute($ws,$i + 1 + ($shift++));
- $spaceAdded = true;
- } else {
- $spaceAdded = false;
- }
-
- }
- }
-
- public function getLeftMostChild() {
- if (empty($this->children)) {
- return $this;
- }
- return $this->children[0]->getLeftMostChild();
- }
-
- public function getRightMostChild() {
- if (empty($this->children)) {
- return $this;
- }
- return $this->children[$this->getNbChildren() - 1]->getRightMostChild();
- }
-
- public function isPre() {
- return 0 == strcasecmp($this->qName,'pre');
- }
-
- public static function toDiffLine(TagNode $node) {
- return $node->openingTag;
- }
-}
-
-/**
- * Represents a piece of text in the HTML file.
- * @ingroup DifferenceEngine
- */
-class TextNode extends Node {
-
- public $text;
-
- public $modification;
-
- function __construct($parent, $text) {
- parent::__construct($parent);
- $this->modification = new Modification(Modification::NONE);
- $this->text = $text;
- }
-
- public function copyTree() {
- $clone = clone $this;
- $clone->setParent(null);
- return $clone;
- }
-
- public function getLeftMostChild() {
- return $this;
- }
-
- public function getRightMostChild() {
- return $this;
- }
-
- public function getMinimalDeletedSet($id, &$allDeleted, &$somethingDeleted) {
- if ($this->modification->type == Modification::REMOVED
- && $this->modification->id == $id){
- $somethingDeleted = true;
- $allDeleted = true;
- return array($this);
- }
- return array();
- }
-
- public function isSameText($other) {
- if (is_null($other) || ! $other instanceof TextNode) {
- return false;
- }
- return str_replace('\n', ' ',$this->text) === str_replace('\n', ' ',$other->text);
- }
-
- public static function toDiffLine(TextNode $node) {
- return str_replace('\n', ' ',$node->text);
- }
-}
-
-/**
- * @todo Document
- * @ingroup DifferenceEngine
- */
-class WhiteSpaceNode extends TextNode {
-
- function __construct($parent, $s, Node $like = null) {
- parent::__construct($parent, $s);
- if(!is_null($like) && $like instanceof TextNode) {
- $newModification = clone $like->modification;
- $newModification->firstOfID = false;
- $this->modification = $newModification;
- }
- }
-}
-
-/**
- * Represents the root of a HTML document.
- * @ingroup DifferenceEngine
- */
-class BodyNode extends TagNode {
-
- function __construct() {
- parent::__construct(null, 'body', array());
- }
-
- public function copyTree() {
- $newThis = new BodyNode();
- foreach ($this->children as &$child) {
- $newChild = $child->copyTree();
- $newChild->setParent($newThis);
- $newThis->children[] = $newChild;
- }
- return $newThis;
- }
-
- public function getMinimalDeletedSet($id, &$allDeleted, &$somethingDeleted) {
- $nodes = array();
- foreach ($this->children as &$child) {
- $childrenChildren = $child->getMinimalDeletedSet($id,
- $allDeleted, $somethingDeleted);
- $nodes = array_merge($nodes, $childrenChildren);
- }
- return $nodes;
- }
-
-}
-
-/**
- * Represents an image in HTML. Even though images do not contain any text they
- * are independent visible objects on the page. They are logically a TextNode.
- * @ingroup DifferenceEngine
- */
-class ImageNode extends TextNode {
-
- public $attributes;
-
- function __construct(TagNode $parent, /*array*/ $attrs) {
- if(!array_key_exists('src', $attrs)) {
- HTMLDiffer::diffDebug( "Image without a source\n" );
- parent::__construct($parent, '<img></img>');
- }else{
- parent::__construct($parent, '<img>' . strtolower($attrs['src']) . '</img>');
- }
- $this->attributes = $attrs;
- }
-
- public function isSameText($other) {
- if (is_null($other) || ! $other instanceof ImageNode) {
- return false;
- }
- return $this->text === $other->text;
- }
-
-}
-
-/**
- * No-op node
- * @ingroup DifferenceEngine
- */
-class DummyNode extends Node {
-
- function __construct() {
- // no op
- }
-
-}
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