684 lines
22 KiB
PHP
684 lines
22 KiB
PHP
<?php
|
|
namespace Masterminds\HTML5\Parser;
|
|
|
|
use Masterminds\HTML5\Elements;
|
|
|
|
/**
|
|
* Create an HTML5 DOM tree from events.
|
|
*
|
|
* This attempts to create a DOM from events emitted by a parser. This
|
|
* attempts (but does not guarantee) to up-convert older HTML documents
|
|
* to HTML5. It does this by applying HTML5's rules, but it will not
|
|
* change the architecture of the document itself.
|
|
*
|
|
* Many of the error correction and quirks features suggested in the specification
|
|
* are implemented herein; however, not all of them are. Since we do not
|
|
* assume a graphical user agent, no presentation-specific logic is conducted
|
|
* during tree building.
|
|
*
|
|
* FIXME: The present tree builder does not exactly follow the state machine rules
|
|
* for insert modes as outlined in the HTML5 spec. The processor needs to be
|
|
* re-written to accomodate this. See, for example, the Go language HTML5
|
|
* parser.
|
|
*/
|
|
class DOMTreeBuilder implements EventHandler
|
|
{
|
|
/**
|
|
* Defined in http://www.w3.org/TR/html51/infrastructure.html#html-namespace-0
|
|
*/
|
|
const NAMESPACE_HTML = 'http://www.w3.org/1999/xhtml';
|
|
|
|
const NAMESPACE_MATHML = 'http://www.w3.org/1998/Math/MathML';
|
|
|
|
const NAMESPACE_SVG = 'http://www.w3.org/2000/svg';
|
|
|
|
const NAMESPACE_XLINK = 'http://www.w3.org/1999/xlink';
|
|
|
|
const NAMESPACE_XML = 'http://www.w3.org/XML/1998/namespace';
|
|
|
|
const NAMESPACE_XMLNS = 'http://www.w3.org/2000/xmlns/';
|
|
|
|
const OPT_DISABLE_HTML_NS = 'disable_html_ns';
|
|
|
|
const OPT_TARGET_DOC = 'target_document';
|
|
|
|
const OPT_IMPLICIT_NS = 'implicit_namespaces';
|
|
|
|
/**
|
|
* Holds the HTML5 element names that causes a namespace switch
|
|
*
|
|
* @var array
|
|
*/
|
|
protected $nsRoots = array(
|
|
'html' => self::NAMESPACE_HTML,
|
|
'svg' => self::NAMESPACE_SVG,
|
|
'math' => self::NAMESPACE_MATHML
|
|
);
|
|
|
|
/**
|
|
* Holds the always available namespaces (which does not require the XMLNS declaration).
|
|
*
|
|
* @var array
|
|
*/
|
|
protected $implicitNamespaces = array(
|
|
'xml' => self::NAMESPACE_XML,
|
|
'xmlns' => self::NAMESPACE_XMLNS,
|
|
'xlink' => self::NAMESPACE_XLINK
|
|
);
|
|
|
|
/**
|
|
* Holds a stack of currently active namespaces.
|
|
*
|
|
* @var array
|
|
*/
|
|
protected $nsStack = array();
|
|
|
|
/**
|
|
* Holds the number of namespaces declared by a node.
|
|
*
|
|
* @var array
|
|
*/
|
|
protected $pushes = array();
|
|
|
|
/**
|
|
* Defined in 8.2.5.
|
|
*/
|
|
const IM_INITIAL = 0;
|
|
|
|
const IM_BEFORE_HTML = 1;
|
|
|
|
const IM_BEFORE_HEAD = 2;
|
|
|
|
const IM_IN_HEAD = 3;
|
|
|
|
const IM_IN_HEAD_NOSCRIPT = 4;
|
|
|
|
const IM_AFTER_HEAD = 5;
|
|
|
|
const IM_IN_BODY = 6;
|
|
|
|
const IM_TEXT = 7;
|
|
|
|
const IM_IN_TABLE = 8;
|
|
|
|
const IM_IN_TABLE_TEXT = 9;
|
|
|
|
const IM_IN_CAPTION = 10;
|
|
|
|
const IM_IN_COLUMN_GROUP = 11;
|
|
|
|
const IM_IN_TABLE_BODY = 12;
|
|
|
|
const IM_IN_ROW = 13;
|
|
|
|
const IM_IN_CELL = 14;
|
|
|
|
const IM_IN_SELECT = 15;
|
|
|
|
const IM_IN_SELECT_IN_TABLE = 16;
|
|
|
|
const IM_AFTER_BODY = 17;
|
|
|
|
const IM_IN_FRAMESET = 18;
|
|
|
|
const IM_AFTER_FRAMESET = 19;
|
|
|
|
const IM_AFTER_AFTER_BODY = 20;
|
|
|
|
const IM_AFTER_AFTER_FRAMESET = 21;
|
|
|
|
const IM_IN_SVG = 22;
|
|
|
|
const IM_IN_MATHML = 23;
|
|
|
|
protected $options = array();
|
|
|
|
protected $stack = array();
|
|
|
|
protected $current; // Pointer in the tag hierarchy.
|
|
protected $doc;
|
|
|
|
protected $frag;
|
|
|
|
protected $processor;
|
|
|
|
protected $insertMode = 0;
|
|
|
|
/**
|
|
* Track if we are in an element that allows only inline child nodes
|
|
* @var string|null
|
|
*/
|
|
protected $onlyInline;
|
|
|
|
/**
|
|
* Quirks mode is enabled by default.
|
|
* Any document that is missing the
|
|
* DT will be considered to be in quirks mode.
|
|
*/
|
|
protected $quirks = true;
|
|
|
|
protected $errors = array();
|
|
|
|
public function __construct($isFragment = false, array $options = array())
|
|
{
|
|
$this->options = $options;
|
|
|
|
if (isset($options[self::OPT_TARGET_DOC])) {
|
|
$this->doc = $options[self::OPT_TARGET_DOC];
|
|
} else {
|
|
$impl = new \DOMImplementation();
|
|
// XXX:
|
|
// Create the doctype. For now, we are always creating HTML5
|
|
// documents, and attempting to up-convert any older DTDs to HTML5.
|
|
$dt = $impl->createDocumentType('html');
|
|
// $this->doc = \DOMImplementation::createDocument(NULL, 'html', $dt);
|
|
$this->doc = $impl->createDocument(null, null, $dt);
|
|
}
|
|
$this->errors = array();
|
|
|
|
$this->current = $this->doc; // ->documentElement;
|
|
|
|
// Create a rules engine for tags.
|
|
$this->rules = new TreeBuildingRules($this->doc);
|
|
|
|
$implicitNS = array();
|
|
if (isset($this->options[self::OPT_IMPLICIT_NS])) {
|
|
$implicitNS = $this->options[self::OPT_IMPLICIT_NS];
|
|
} elseif (isset($this->options["implicitNamespaces"])) {
|
|
$implicitNS = $this->options["implicitNamespaces"];
|
|
}
|
|
|
|
// Fill $nsStack with the defalut HTML5 namespaces, plus the "implicitNamespaces" array taken form $options
|
|
array_unshift($this->nsStack, $implicitNS + array(
|
|
'' => self::NAMESPACE_HTML
|
|
) + $this->implicitNamespaces);
|
|
|
|
if ($isFragment) {
|
|
$this->insertMode = static::IM_IN_BODY;
|
|
$this->frag = $this->doc->createDocumentFragment();
|
|
$this->current = $this->frag;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Get the document.
|
|
*/
|
|
public function document()
|
|
{
|
|
return $this->doc;
|
|
}
|
|
|
|
/**
|
|
* Get the DOM fragment for the body.
|
|
*
|
|
* This returns a DOMNodeList because a fragment may have zero or more
|
|
* DOMNodes at its root.
|
|
*
|
|
* @see http://www.w3.org/TR/2012/CR-html5-20121217/syntax.html#concept-frag-parse-context
|
|
*
|
|
* @return \DOMFragmentDocumentFragment
|
|
*/
|
|
public function fragment()
|
|
{
|
|
return $this->frag;
|
|
}
|
|
|
|
/**
|
|
* Provide an instruction processor.
|
|
*
|
|
* This is used for handling Processor Instructions as they are
|
|
* inserted. If omitted, PI's are inserted directly into the DOM tree.
|
|
*/
|
|
public function setInstructionProcessor(\Masterminds\HTML5\InstructionProcessor $proc)
|
|
{
|
|
$this->processor = $proc;
|
|
}
|
|
|
|
public function doctype($name, $idType = 0, $id = null, $quirks = false)
|
|
{
|
|
// This is used solely for setting quirks mode. Currently we don't
|
|
// try to preserve the inbound DT. We convert it to HTML5.
|
|
$this->quirks = $quirks;
|
|
|
|
if ($this->insertMode > static::IM_INITIAL) {
|
|
$this->parseError("Illegal placement of DOCTYPE tag. Ignoring: " . $name);
|
|
|
|
return;
|
|
}
|
|
|
|
$this->insertMode = static::IM_BEFORE_HTML;
|
|
}
|
|
|
|
/**
|
|
* Process the start tag.
|
|
*
|
|
* @todo - XMLNS namespace handling (we need to parse, even if it's not valid)
|
|
* - XLink, MathML and SVG namespace handling
|
|
* - Omission rules: 8.1.2.4 Optional tags
|
|
*/
|
|
public function startTag($name, $attributes = array(), $selfClosing = false)
|
|
{
|
|
// fprintf(STDOUT, $name);
|
|
$lname = $this->normalizeTagName($name);
|
|
|
|
// Make sure we have an html element.
|
|
if (! $this->doc->documentElement && $name !== 'html' && ! $this->frag) {
|
|
$this->startTag('html');
|
|
}
|
|
|
|
// Set quirks mode if we're at IM_INITIAL with no doctype.
|
|
if ($this->insertMode == static::IM_INITIAL) {
|
|
$this->quirks = true;
|
|
$this->parseError("No DOCTYPE specified.");
|
|
}
|
|
|
|
// SPECIAL TAG HANDLING:
|
|
// Spec says do this, and "don't ask."
|
|
if ($name == 'image') {
|
|
$name = 'img';
|
|
}
|
|
|
|
// Autoclose p tags where appropriate.
|
|
if ($this->insertMode >= static::IM_IN_BODY && Elements::isA($name, Elements::AUTOCLOSE_P)) {
|
|
$this->autoclose('p');
|
|
}
|
|
|
|
// Set insert mode:
|
|
switch ($name) {
|
|
case 'html':
|
|
$this->insertMode = static::IM_BEFORE_HEAD;
|
|
break;
|
|
case 'head':
|
|
if ($this->insertMode > static::IM_BEFORE_HEAD) {
|
|
$this->parseError("Unexpected head tag outside of head context.");
|
|
} else {
|
|
$this->insertMode = static::IM_IN_HEAD;
|
|
}
|
|
break;
|
|
case 'body':
|
|
$this->insertMode = static::IM_IN_BODY;
|
|
break;
|
|
case 'svg':
|
|
$this->insertMode = static::IM_IN_SVG;
|
|
break;
|
|
case 'math':
|
|
$this->insertMode = static::IM_IN_MATHML;
|
|
break;
|
|
case 'noscript':
|
|
if ($this->insertMode == static::IM_IN_HEAD) {
|
|
$this->insertMode = static::IM_IN_HEAD_NOSCRIPT;
|
|
}
|
|
break;
|
|
}
|
|
|
|
// Special case handling for SVG.
|
|
if ($this->insertMode == static::IM_IN_SVG) {
|
|
$lname = Elements::normalizeSvgElement($lname);
|
|
}
|
|
|
|
$pushes = 0;
|
|
// when we found a tag thats appears inside $nsRoots, we have to switch the defalut namespace
|
|
if (isset($this->nsRoots[$lname]) && $this->nsStack[0][''] !== $this->nsRoots[$lname]) {
|
|
array_unshift($this->nsStack, array(
|
|
'' => $this->nsRoots[$lname]
|
|
) + $this->nsStack[0]);
|
|
$pushes ++;
|
|
}
|
|
$needsWorkaround = false;
|
|
if (isset($this->options["xmlNamespaces"]) && $this->options["xmlNamespaces"]) {
|
|
// when xmlNamespaces is true a and we found a 'xmlns' or 'xmlns:*' attribute, we should add a new item to the $nsStack
|
|
foreach ($attributes as $aName => $aVal) {
|
|
if ($aName === 'xmlns') {
|
|
$needsWorkaround = $aVal;
|
|
array_unshift($this->nsStack, array(
|
|
'' => $aVal
|
|
) + $this->nsStack[0]);
|
|
$pushes ++;
|
|
} elseif ((($pos = strpos($aName, ':')) ? substr($aName, 0, $pos) : '') === 'xmlns') {
|
|
array_unshift($this->nsStack, array(
|
|
substr($aName, $pos + 1) => $aVal
|
|
) + $this->nsStack[0]);
|
|
$pushes ++;
|
|
}
|
|
}
|
|
}
|
|
|
|
if ($this->onlyInline && Elements::isA($lname, Elements::BLOCK_TAG)) {
|
|
$this->autoclose($this->onlyInline);
|
|
$this->onlyInline = null;
|
|
}
|
|
|
|
try {
|
|
$prefix = ($pos = strpos($lname, ':')) ? substr($lname, 0, $pos) : '';
|
|
|
|
|
|
if ($needsWorkaround!==false) {
|
|
|
|
$xml = "<$lname xmlns=\"$needsWorkaround\" ".(strlen($prefix) && isset($this->nsStack[0][$prefix])?("xmlns:$prefix=\"".$this->nsStack[0][$prefix]."\""):"")."/>";
|
|
|
|
$frag = new \DOMDocument('1.0', 'UTF-8');
|
|
$frag->loadXML($xml);
|
|
|
|
$ele = $this->doc->importNode($frag->documentElement, true);
|
|
|
|
} else {
|
|
if (!isset($this->nsStack[0][$prefix]) || ($prefix === "" && isset($this->options[self::OPT_DISABLE_HTML_NS]) && $this->options[self::OPT_DISABLE_HTML_NS])) {
|
|
$ele = $this->doc->createElement($lname);
|
|
} else {
|
|
$ele = $this->doc->createElementNS($this->nsStack[0][$prefix], $lname);
|
|
}
|
|
}
|
|
|
|
} catch (\DOMException $e) {
|
|
$this->parseError("Illegal tag name: <$lname>. Replaced with <invalid>.");
|
|
$ele = $this->doc->createElement('invalid');
|
|
}
|
|
|
|
if (Elements::isA($lname, Elements::BLOCK_ONLY_INLINE)) {
|
|
$this->onlyInline = $lname;
|
|
}
|
|
|
|
// When we add some namespacess, we have to track them. Later, when "endElement" is invoked, we have to remove them.
|
|
// When we are on a void tag, we do not need to care about namesapce nesting.
|
|
if ($pushes > 0 && !Elements::isA($name, Elements::VOID_TAG)) {
|
|
// PHP tends to free the memory used by DOM,
|
|
// to avoid spl_object_hash collisions whe have to avoid garbage collection of $ele storing it into $pushes
|
|
// see https://bugs.php.net/bug.php?id=67459
|
|
$this->pushes[spl_object_hash($ele)] = array($pushes, $ele);
|
|
|
|
// SEE https://github.com/facebook/hhvm/issues/2962
|
|
if (defined('HHVM_VERSION')) {
|
|
$ele->setAttribute('html5-php-fake-id-attribute', spl_object_hash($ele));
|
|
}
|
|
}
|
|
|
|
foreach ($attributes as $aName => $aVal) {
|
|
// xmlns attributes can't be set
|
|
if ($aName === 'xmlns') {
|
|
continue;
|
|
}
|
|
|
|
if ($this->insertMode == static::IM_IN_SVG) {
|
|
$aName = Elements::normalizeSvgAttribute($aName);
|
|
} elseif ($this->insertMode == static::IM_IN_MATHML) {
|
|
$aName = Elements::normalizeMathMlAttribute($aName);
|
|
}
|
|
|
|
try {
|
|
$prefix = ($pos = strpos($aName, ':')) ? substr($aName, 0, $pos) : false;
|
|
|
|
if ($prefix==='xmlns') {
|
|
$ele->setAttributeNs(self::NAMESPACE_XMLNS, $aName, $aVal);
|
|
} elseif ($prefix!==false && isset($this->nsStack[0][$prefix])) {
|
|
$ele->setAttributeNs($this->nsStack[0][$prefix], $aName, $aVal);
|
|
} else {
|
|
$ele->setAttribute($aName, $aVal);
|
|
}
|
|
} catch (\DOMException $e) {
|
|
$this->parseError("Illegal attribute name for tag $name. Ignoring: $aName");
|
|
continue;
|
|
}
|
|
|
|
// This is necessary on a non-DTD schema, like HTML5.
|
|
if ($aName == 'id') {
|
|
$ele->setIdAttribute('id', true);
|
|
}
|
|
}
|
|
|
|
// Some elements have special processing rules. Handle those separately.
|
|
if ($this->rules->hasRules($name) && $this->frag !== $this->current) {
|
|
$this->current = $this->rules->evaluate($ele, $this->current);
|
|
} // Otherwise, it's a standard element.
|
|
else {
|
|
$this->current->appendChild($ele);
|
|
|
|
// XXX: Need to handle self-closing tags and unary tags.
|
|
if (! Elements::isA($name, Elements::VOID_TAG)) {
|
|
$this->current = $ele;
|
|
}
|
|
}
|
|
|
|
// This is sort of a last-ditch attempt to correct for cases where no head/body
|
|
// elements are provided.
|
|
if ($this->insertMode <= static::IM_BEFORE_HEAD && $name != 'head' && $name != 'html') {
|
|
$this->insertMode = static::IM_IN_BODY;
|
|
}
|
|
|
|
// When we are on a void tag, we do not need to care about namesapce nesting,
|
|
// but we have to remove the namespaces pushed to $nsStack.
|
|
if ($pushes > 0 && Elements::isA($name, Elements::VOID_TAG)) {
|
|
// remove the namespaced definded by current node
|
|
for ($i = 0; $i < $pushes; $i ++) {
|
|
array_shift($this->nsStack);
|
|
}
|
|
}
|
|
// Return the element mask, which the tokenizer can then use to set
|
|
// various processing rules.
|
|
return Elements::element($name);
|
|
}
|
|
|
|
public function endTag($name)
|
|
{
|
|
$lname = $this->normalizeTagName($name);
|
|
|
|
// Ignore closing tags for unary elements.
|
|
if (Elements::isA($name, Elements::VOID_TAG)) {
|
|
return;
|
|
}
|
|
|
|
if ($this->insertMode <= static::IM_BEFORE_HTML) {
|
|
// 8.2.5.4.2
|
|
if (in_array($name, array(
|
|
'html',
|
|
'br',
|
|
'head',
|
|
'title'
|
|
))) {
|
|
$this->startTag('html');
|
|
$this->endTag($name);
|
|
$this->insertMode = static::IM_BEFORE_HEAD;
|
|
|
|
return;
|
|
}
|
|
|
|
// Ignore the tag.
|
|
$this->parseError("Illegal closing tag at global scope.");
|
|
|
|
return;
|
|
}
|
|
|
|
// Special case handling for SVG.
|
|
if ($this->insertMode == static::IM_IN_SVG) {
|
|
$lname = Elements::normalizeSvgElement($lname);
|
|
}
|
|
|
|
// See https://github.com/facebook/hhvm/issues/2962
|
|
if (defined('HHVM_VERSION') && ($cid = $this->current->getAttribute('html5-php-fake-id-attribute'))) {
|
|
$this->current->removeAttribute('html5-php-fake-id-attribute');
|
|
} else {
|
|
$cid = spl_object_hash($this->current);
|
|
}
|
|
|
|
// XXX: Not sure whether we need this anymore.
|
|
// if ($name != $lname) {
|
|
// return $this->quirksTreeResolver($lname);
|
|
// }
|
|
|
|
// XXX: HTML has no parent. What do we do, though,
|
|
// if this element appears in the wrong place?
|
|
if ($lname == 'html') {
|
|
return;
|
|
}
|
|
|
|
// remove the namespaced definded by current node
|
|
if (isset($this->pushes[$cid])) {
|
|
for ($i = 0; $i < $this->pushes[$cid][0]; $i ++) {
|
|
array_shift($this->nsStack);
|
|
}
|
|
unset($this->pushes[$cid]);
|
|
}
|
|
|
|
if (! $this->autoclose($lname)) {
|
|
$this->parseError('Could not find closing tag for ' . $lname);
|
|
}
|
|
|
|
// switch ($this->insertMode) {
|
|
switch ($lname) {
|
|
case "head":
|
|
$this->insertMode = static::IM_AFTER_HEAD;
|
|
break;
|
|
case "body":
|
|
$this->insertMode = static::IM_AFTER_BODY;
|
|
break;
|
|
case "svg":
|
|
case "mathml":
|
|
$this->insertMode = static::IM_IN_BODY;
|
|
break;
|
|
}
|
|
}
|
|
|
|
public function comment($cdata)
|
|
{
|
|
// TODO: Need to handle case where comment appears outside of the HTML tag.
|
|
$node = $this->doc->createComment($cdata);
|
|
$this->current->appendChild($node);
|
|
}
|
|
|
|
public function text($data)
|
|
{
|
|
// XXX: Hmmm.... should we really be this strict?
|
|
if ($this->insertMode < static::IM_IN_HEAD) {
|
|
// Per '8.2.5.4.3 The "before head" insertion mode' the characters
|
|
// " \t\n\r\f" should be ignored but no mention of a parse error. This is
|
|
// practical as most documents contain these characters. Other text is not
|
|
// expected here so recording a parse error is necessary.
|
|
$dataTmp = trim($data, " \t\n\r\f");
|
|
if (! empty($dataTmp)) {
|
|
// fprintf(STDOUT, "Unexpected insert mode: %d", $this->insertMode);
|
|
$this->parseError("Unexpected text. Ignoring: " . $dataTmp);
|
|
}
|
|
|
|
return;
|
|
}
|
|
// fprintf(STDOUT, "Appending text %s.", $data);
|
|
$node = $this->doc->createTextNode($data);
|
|
$this->current->appendChild($node);
|
|
}
|
|
|
|
public function eof()
|
|
{
|
|
// If the $current isn't the $root, do we need to do anything?
|
|
}
|
|
|
|
public function parseError($msg, $line = 0, $col = 0)
|
|
{
|
|
$this->errors[] = sprintf("Line %d, Col %d: %s", $line, $col, $msg);
|
|
}
|
|
|
|
public function getErrors()
|
|
{
|
|
return $this->errors;
|
|
}
|
|
|
|
public function cdata($data)
|
|
{
|
|
$node = $this->doc->createCDATASection($data);
|
|
$this->current->appendChild($node);
|
|
}
|
|
|
|
public function processingInstruction($name, $data = null)
|
|
{
|
|
// XXX: Ignore initial XML declaration, per the spec.
|
|
if ($this->insertMode == static::IM_INITIAL && 'xml' == strtolower($name)) {
|
|
return;
|
|
}
|
|
|
|
// Important: The processor may modify the current DOM tree however
|
|
// it sees fit.
|
|
if (isset($this->processor)) {
|
|
$res = $this->processor->process($this->current, $name, $data);
|
|
if (! empty($res)) {
|
|
$this->current = $res;
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
// Otherwise, this is just a dumb PI element.
|
|
$node = $this->doc->createProcessingInstruction($name, $data);
|
|
|
|
$this->current->appendChild($node);
|
|
}
|
|
|
|
// ==========================================================================
|
|
// UTILITIES
|
|
// ==========================================================================
|
|
|
|
/**
|
|
* Apply normalization rules to a tag name.
|
|
*
|
|
* See sections 2.9 and 8.1.2.
|
|
*
|
|
* @param string $name
|
|
* The tag name.
|
|
* @return string The normalized tag name.
|
|
*/
|
|
protected function normalizeTagName($name)
|
|
{
|
|
/*
|
|
* Section 2.9 suggests that we should not do this. if (strpos($name, ':') !== false) { // We know from the grammar that there must be at least one other // char besides :, since : is not a legal tag start. $parts = explode(':', $name); return array_pop($parts); }
|
|
*/
|
|
return $name;
|
|
}
|
|
|
|
protected function quirksTreeResolver($name)
|
|
{
|
|
throw new \Exception("Not implemented.");
|
|
}
|
|
|
|
/**
|
|
* Automatically climb the tree and close the closest node with the matching $tag.
|
|
*/
|
|
protected function autoclose($tag)
|
|
{
|
|
$working = $this->current;
|
|
do {
|
|
if ($working->nodeType != XML_ELEMENT_NODE) {
|
|
return false;
|
|
}
|
|
if ($working->tagName == $tag) {
|
|
$this->current = $working->parentNode;
|
|
|
|
return true;
|
|
}
|
|
} while ($working = $working->parentNode);
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Checks if the given tagname is an ancestor of the present candidate.
|
|
*
|
|
* If $this->current or anything above $this->current matches the given tag
|
|
* name, this returns true.
|
|
*/
|
|
protected function isAncestor($tagname)
|
|
{
|
|
$candidate = $this->current;
|
|
while ($candidate->nodeType === XML_ELEMENT_NODE) {
|
|
if ($candidate->tagName == $tagname) {
|
|
return true;
|
|
}
|
|
$candidate = $candidate->parentNode;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Returns true if the immediate parent element is of the given tagname.
|
|
*/
|
|
protected function isParent($tagname)
|
|
{
|
|
return $this->current->tagName == $tagname;
|
|
}
|
|
} |