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<?php
/**
* DOMPDF - PHP5 HTML to PDF renderer
*
* File: $RCSfile: frame_tree.cls.php,v $
* Created on: 2004-06-02
*
* Copyright (c) 2004 - Benj Carson <benjcarson@digitaljunkies.ca>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library in the file LICENSE.LGPL; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
* 02111-1307 USA
*
* Alternatively, you may distribute this software under the terms of the
* PHP License, version 3.0 or later. A copy of this license should have
* been distributed with this file in the file LICENSE.PHP . If this is not
* the case, you can obtain a copy at http://www.php.net/license/3_0.txt.
*
* The latest version of DOMPDF might be available at:
* http://www.digitaljunkies.ca/dompdf
*
* @link http://www.digitaljunkies.ca/dompdf
* @copyright 2004 Benj Carson
* @author Benj Carson <benjcarson@digitaljunkies.ca>
* @package dompdf
* @version 0.5.1
*/
/* $Id: frame_tree.cls.php,v 1.10 2006/07/07 21:31:03 benjcarson Exp $ */
/**
* Represents an entire document as a tree of frames
*
* The Frame_Tree consists of {@link Frame} objects each tied to specific
* DomNode objects in a specific DomDocument. The Frame_Tree has the same
* structure as the DomDocument, but adds additional capabalities for
* styling and layout.
*
* @package dompdf
* @access protected
*/
class Frame_Tree {
/**
* Tags to ignore while parsing the tree
*
* @var array
*/
static protected $_HIDDEN_TAGS = array("area", "base", "basefont", "head", "style",
"meta", "title", "colgroup",
"noembed", "noscript", "param", "#comment");
/**
* The main DomDocument
*
* @see http://ca2.php.net/manual/en/ref.dom.php
* @var DomDocument
*/
protected $_dom;
/**
* The root node of the FrameTree.
*
* @var Frame
*/
protected $_root;
/**
* A mapping of {@link Frame} objects to DomNode objects
*
* @var array
*/
protected $_registry;
/**
* Class constructor
*
* @param DomDocument $dom the main DomDocument object representing the current html document
*/
function __construct(DomDocument $dom) {
$this->_dom = $dom;
$this->_root = null;
$this->_registry = array();
}
/**
* Returns the DomDocument object representing the curent html document
*
* @return DomDocument
*/
function get_dom() { return $this->_dom; }
/**
* Returns the root frame of the tree
*
* @return Frame
*/
function get_root() { return $this->_root; }
/**
* Returns a specific frame given its id
*
* @param string $id
* @return Frame
*/
function get_frame($id) { return isset($this->_registry[$id]) ? $this->_registry[$id] : null; }
/**
* Returns a post-order iterator for all frames in the tree
*
* @return FrameTreeList
*/
function get_frames() { return new FrameTreeList($this->_root); }
/**
* Builds the tree
*/
function build_tree() {
$html = $this->_dom->getElementsByTagName("html")->item(0);
if ( is_null($html) )
$html = $this->_dom->firstChild;
if ( is_null($html) )
throw new DOMPDF_Exception("Requested HTML document contains no data.");
$this->_root = $this->_build_tree_r($html);
}
/**
* Recursively adds {@link Frame} objects to the tree
*
* Recursively build a tree of Frame objects based on a dom tree.
* No layout information is calculated at this time, although the
* tree may be adjusted (i.e. nodes and frames for generated content
* and images may be created).
*
* @param DomNode $node the current DomNode being considered
* @return Frame
*/
protected function _build_tree_r(DomNode $node) {
$frame = new Frame($node);
$id = $frame->get_id();
$this->_registry[ $id ] = $frame;
if ( !$node->hasChildNodes() )
return $frame;
// Fixes 'cannot access undefined property for object with
// overloaded access', fix by Stefan radulian
// <stefan.radulian@symbion.at>
//foreach ($node->childNodes as $child) {
// Store the children in an array so that the tree can be modified
$children = array();
for ($i = 0; $i < $node->childNodes->length; $i++)
$children[] = $node->childNodes->item($i);
foreach ($children as $child) {
// Skip non-displaying nodes
if ( in_array( mb_strtolower($child->nodeName), self::$_HIDDEN_TAGS) ) {
if ( mb_strtolower($child->nodeName) != "head" &&
mb_strtolower($child->nodeName) != "style" )
$child->parentNode->removeChild($child);
continue;
}
// Skip empty text nodes
if ( $child->nodeName == "#text" && $child->nodeValue == "" ) {
$child->parentNode->removeChild($child);
continue;
}
// Add a container frame for images
if ( $child->nodeName == "img" ) {
$img_node = $child->ownerDocument->createElement("img_inner");
// Move attributes to inner node
foreach ( $child->attributes as $attr => $attr_node ) {
// Skip style, but move all other attributes
if ( $attr == "style" )
continue;
$img_node->setAttribute($attr, $attr_node->value);
}
foreach ( $child->attributes as $attr => $node ) {
if ( $attr == "style" )
continue;
$child->removeAttribute($attr);
}
$child->appendChild($img_node);
}
$frame->append_child($this->_build_tree_r($child), false);
}
return $frame;
}
}
?>