216 lines
6.1 KiB
PHP
216 lines
6.1 KiB
PHP
<?php
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/**
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* DOMPDF - PHP5 HTML to PDF renderer
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*
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* File: $RCSfile: frame_tree.cls.php,v $
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* Created on: 2004-06-02
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*
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* Copyright (c) 2004 - Benj Carson <benjcarson@digitaljunkies.ca>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library in the file LICENSE.LGPL; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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* 02111-1307 USA
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*
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* Alternatively, you may distribute this software under the terms of the
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* PHP License, version 3.0 or later. A copy of this license should have
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* been distributed with this file in the file LICENSE.PHP . If this is not
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* the case, you can obtain a copy at http://www.php.net/license/3_0.txt.
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*
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* The latest version of DOMPDF might be available at:
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* http://www.digitaljunkies.ca/dompdf
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*
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* @link http://www.digitaljunkies.ca/dompdf
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* @copyright 2004 Benj Carson
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* @author Benj Carson <benjcarson@digitaljunkies.ca>
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* @package dompdf
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* @version 0.5.1
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*/
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/* $Id: frame_tree.cls.php,v 1.10 2006/07/07 21:31:03 benjcarson Exp $ */
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/**
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* Represents an entire document as a tree of frames
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*
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* The Frame_Tree consists of {@link Frame} objects each tied to specific
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* DomNode objects in a specific DomDocument. The Frame_Tree has the same
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* structure as the DomDocument, but adds additional capabalities for
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* styling and layout.
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*
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* @package dompdf
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* @access protected
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*/
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class Frame_Tree {
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/**
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* Tags to ignore while parsing the tree
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*
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* @var array
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*/
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static protected $_HIDDEN_TAGS = array("area", "base", "basefont", "head", "style",
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"meta", "title", "colgroup",
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"noembed", "noscript", "param", "#comment");
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/**
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* The main DomDocument
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*
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* @see http://ca2.php.net/manual/en/ref.dom.php
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* @var DomDocument
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*/
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protected $_dom;
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/**
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* The root node of the FrameTree.
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*
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* @var Frame
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*/
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protected $_root;
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/**
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* A mapping of {@link Frame} objects to DomNode objects
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*
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* @var array
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*/
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protected $_registry;
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/**
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* Class constructor
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*
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* @param DomDocument $dom the main DomDocument object representing the current html document
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*/
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function __construct(DomDocument $dom) {
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$this->_dom = $dom;
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$this->_root = null;
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$this->_registry = array();
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}
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/**
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* Returns the DomDocument object representing the curent html document
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*
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* @return DomDocument
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*/
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function get_dom() { return $this->_dom; }
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/**
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* Returns the root frame of the tree
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*
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* @return Frame
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*/
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function get_root() { return $this->_root; }
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/**
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* Returns a specific frame given its id
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*
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* @param string $id
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* @return Frame
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*/
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function get_frame($id) { return isset($this->_registry[$id]) ? $this->_registry[$id] : null; }
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/**
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* Returns a post-order iterator for all frames in the tree
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*
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* @return FrameTreeList
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*/
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function get_frames() { return new FrameTreeList($this->_root); }
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/**
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* Builds the tree
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*/
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function build_tree() {
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$html = $this->_dom->getElementsByTagName("html")->item(0);
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if ( is_null($html) )
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$html = $this->_dom->firstChild;
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if ( is_null($html) )
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throw new DOMPDF_Exception("Requested HTML document contains no data.");
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$this->_root = $this->_build_tree_r($html);
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}
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/**
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* Recursively adds {@link Frame} objects to the tree
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*
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* Recursively build a tree of Frame objects based on a dom tree.
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* No layout information is calculated at this time, although the
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* tree may be adjusted (i.e. nodes and frames for generated content
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* and images may be created).
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*
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* @param DomNode $node the current DomNode being considered
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* @return Frame
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*/
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protected function _build_tree_r(DomNode $node) {
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$frame = new Frame($node);
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$id = $frame->get_id();
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$this->_registry[ $id ] = $frame;
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if ( !$node->hasChildNodes() )
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return $frame;
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// Fixes 'cannot access undefined property for object with
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// overloaded access', fix by Stefan radulian
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// <stefan.radulian@symbion.at>
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//foreach ($node->childNodes as $child) {
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// Store the children in an array so that the tree can be modified
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$children = array();
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for ($i = 0; $i < $node->childNodes->length; $i++)
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$children[] = $node->childNodes->item($i);
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foreach ($children as $child) {
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// Skip non-displaying nodes
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if ( in_array( mb_strtolower($child->nodeName), self::$_HIDDEN_TAGS) ) {
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if ( mb_strtolower($child->nodeName) != "head" &&
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mb_strtolower($child->nodeName) != "style" )
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$child->parentNode->removeChild($child);
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continue;
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}
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// Skip empty text nodes
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if ( $child->nodeName == "#text" && $child->nodeValue == "" ) {
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$child->parentNode->removeChild($child);
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continue;
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}
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// Add a container frame for images
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if ( $child->nodeName == "img" ) {
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$img_node = $child->ownerDocument->createElement("img_inner");
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// Move attributes to inner node
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foreach ( $child->attributes as $attr => $attr_node ) {
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// Skip style, but move all other attributes
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if ( $attr == "style" )
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continue;
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$img_node->setAttribute($attr, $attr_node->value);
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}
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foreach ( $child->attributes as $attr => $node ) {
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if ( $attr == "style" )
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continue;
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$child->removeAttribute($attr);
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}
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$child->appendChild($img_node);
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}
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$frame->append_child($this->_build_tree_r($child), false);
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}
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return $frame;
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}
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}
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?>
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