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<?php
namespace HTML5;
/**
* Traverser for walking a DOM tree.
*
* This is a concrete traverser designed to convert a DOM tree into an
* HTML5 document. It is not intended to be a generic DOMTreeWalker
* implementation.
*
* @see http://www.w3.org/TR/2012/CR-html5-20121217/syntax.html#serializing-html-fragments
*/
class Traverser {
static $block_elements = array(
'html' => 1,
'body' => 1,
'head' => 1,
'p' => 1,
'div' => 1,
'h1' => 1,
'h2' => 1,
'h3' => 1,
'h4' => 1,
'h5' => 1,
'h6' => 1,
'title' => 1,
'script' => 1,
'link' => 1,
'meta' => 1,
'section' => 1,
'article' => 1,
'table' => 1,
'tbody' => 1,
'tr' => 1,
'th' => 1,
'td' => 1,
//'form' => 1,
);
protected $dom;
protected $out;
protected $pretty = TRUE;
const DOCTYPE = '<!DOCTYPE html>';
/**
* Create a traverser.
*
* @param DOMNode|DOMNodeList $dom
* The document or node to traverse.
* @param resource $out
* A stream that allows writing. The traverser will output into this
* stream.
*/
public function __construct($dom, $out) {
$this->dom = $dom;
$this->out = $out;
}
/**
* Tell the traverser to walk the DOM.
*
* @return resource $out
* Returns the output stream.
*/
public function walk() {
// If DOMDocument, start with the DOCTYPE and travers.
if ($this->dom instanceof \DOMDocument) {
$this->doctype();
$this->document($this->dom);
}
// If NodeList, loop
elseif ($this->dom instanceof \DOMNodeList) {
// Loop through the list
}
// Else assume this is a DOMNode-like datastructure.
else {
$this->node($this->dom);
}
return $this->out;
}
protected function doctype() {
$this->wr(self::DOCTYPE);
$this->nl();
}
protected function document($node) {
$this->node($node->documentElement);
$this->nl();
}
protected function node($node) {
switch ($node->nodeType) {
case XML_ELEMENT_NODE:
$this->element($node);
break;
case XML_TEXT_NODE:
$this->wr($node->wholeText);
break;
case XML_CDATA_SECTION_NODE:
$this->cdata($node);
break;
// FIXME: It appears that the parser doesn't do PI's.
case XML_PI_NODE:
$this->processorInstruction($ele);
break;
case XML_COMMENT_NODE:
$this->comment($node);
break;
// Currently we don't support embedding DTDs.
default:
print '<!-- Skipped -->';
break;
}
}
protected function element($ele) {
$name = $ele->tagName;
$block = $this->pretty && $this->isBlock($name);
// TODO: Really need to fix the spacing.
// Add a newline for a block element.
if ($block) $this->nl();
$this->openTag($ele);
// Handle children.
if ($ele->hasChildNodes()) {
$this->children($ele->childNodes);
}
// If not unary, add a closing tag.
if (!$this->isUnary($name)) {
$this->closeTag($ele);
if ($block) $this->nl();
}
}
protected function cdata($ele) {
$this->wr('<![CDATA[')->wr($ele->wholeText)->wr(']]>');
}
protected function comment($ele) {
$this->wr('<!--')->wr($ele->data)->wr('-->');
}
protected function processorInstruction($ele) {
$this->wr('<?')->wr($ele->target)->wr(' ')->wr($ele->data)->wr(' ?>');
}
protected function children($nl) {
foreach ($nl as $node) {
$this->node($node);
}
}
protected function openTag($ele) {
$this->wr('<')->wr($ele->tagName);
$this->attrs($ele);
$this->wr('>');
}
protected function attrs($ele) {
if (!$ele->hasAttributes()) {
return $this;
}
// TODO: Currently, this always writes name="value", and does not do
// value-less attributes.
$map = $ele->attributes;
$len = $map->length;
for ($i = 0; $i < $len; ++$i) {
$node = $map->item($i);
$this->wr(' ')->wr($node->name)->wr('="')->wr($node->value)->wr('"');
}
}
protected function closeTag($ele) {
$this->wr('</')->wr($ele->tagName)->wr('>');
}
protected function wr($text) {
fwrite($this->out, $text);
return $this;
}
protected function nl() {
fwrite($this->out, PHP_EOL);
return $this;
}
/**
* Is an unary tag.
*/
protected function isUnary($name) {
return FALSE;
}
/**
* Is block element.
*/
protected function isBlock($name) {
return isset(self::$block_elements[$name]);
}
}
|
