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<?php
/**
* @package dompdf
* @link http://www.dompdf.com/
* @author Benj Carson <benjcarson@digitaljunkies.ca>
* @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
* @version $Id: frame_tree.cls.php 464 2012-01-30 20:44:53Z fabien.menager $
*/
/**
* 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;
/**
* Subtrees of absolutely positioned elements
*
* @var array of Frames
*/
protected $_absolute_frames;
/**
* 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;
$this->_registry = array();
}
function __destruct() {
clear_object($this);
}
/**
* 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 Page_Frame_Decorator
*/
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->fix_tables();
$this->_root = $this->_build_tree_r($html);
}
/**
* Adds missing TBODYs around TR
*/
protected function fix_tables(){
$xp = new DOMXPath($this->_dom);
// Move table caption before the table
// FIXME find a better way to deal with it...
$captions = $xp->query("//table/caption");
foreach($captions as $caption) {
$table = $caption->parentNode;
$table->parentNode->insertBefore($caption, $table);
}
$rows = $xp->query("//table/tr");
foreach($rows as $row) {
$tbody = $this->_dom->createElement("tbody");
$tbody = $row->parentNode->insertBefore($tbody, $row);
$tbody->appendChild($row);
}
}
/**
* 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) {
$node_name = mb_strtolower($child->nodeName);
// Skip non-displaying nodes
if ( in_array($node_name, self::$_HIDDEN_TAGS) ) {
if ( $node_name !== "head" &&
$node_name !== "style" )
$child->parentNode->removeChild($child);
continue;
}
// Skip empty text nodes
if ( $node_name === "#text" && $child->nodeValue == "" ) {
$child->parentNode->removeChild($child);
continue;
}
// Skip empty image nodes
if ( $node_name === "img" && $child->getAttribute("src") == "" ) {
$child->parentNode->removeChild($child);
continue;
}
$frame->append_child($this->_build_tree_r($child), false);
}
return $frame;
}
public function insert_node(DOMNode $node, DOMNode $new_node, $pos) {
if ($pos === "after" || !$node->firstChild)
$node->appendChild($new_node);
else
$node->insertBefore($new_node, $node->firstChild);
$this->_build_tree_r($new_node);
$frame_id = $new_node->getAttribute("frame_id");
$frame = $this->get_frame($frame_id);
$parent_id = $node->getAttribute("frame_id");
$parent = $this->get_frame($parent_id);
if ($pos === "before")
$parent->prepend_child($frame, false);
else
$parent->append_child($frame, false);
return $frame_id;
}
}