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<?php |
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|
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namespace WindPressPackages\Masterminds\HTML5\Parser; |
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|
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use WindPressPackages\Masterminds\HTML5\Elements; |
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use WindPressPackages\Masterminds\HTML5\InstructionProcessor; |
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/** |
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* Create an HTML5 DOM tree from events. |
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* |
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* This attempts to create a DOM from events emitted by a parser. This |
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* attempts (but does not guarantee) to up-convert older HTML documents |
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* to HTML5. It does this by applying HTML5's rules, but it will not |
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* change the architecture of the document itself. |
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* |
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* Many of the error correction and quirks features suggested in the specification |
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* are implemented herein; however, not all of them are. Since we do not |
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* assume a graphical user agent, no presentation-specific logic is conducted |
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* during tree building. |
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* |
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* FIXME: The present tree builder does not exactly follow the state machine rules |
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* for insert modes as outlined in the HTML5 spec. The processor needs to be |
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* re-written to accomodate this. See, for example, the Go language HTML5 |
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* parser. |
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*/ |
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class DOMTreeBuilder implements EventHandler |
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{ |
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/** |
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* Defined in http://www.w3.org/TR/html51/infrastructure.html#html-namespace-0. |
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*/ |
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const NAMESPACE_HTML = 'http://www.w3.org/1999/xhtml'; |
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const NAMESPACE_MATHML = 'http://www.w3.org/1998/Math/MathML'; |
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const NAMESPACE_SVG = 'http://www.w3.org/2000/svg'; |
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const NAMESPACE_XLINK = 'http://www.w3.org/1999/xlink'; |
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const NAMESPACE_XML = 'http://www.w3.org/XML/1998/namespace'; |
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const NAMESPACE_XMLNS = 'http://www.w3.org/2000/xmlns/'; |
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const OPT_DISABLE_HTML_NS = 'disable_html_ns'; |
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const OPT_TARGET_DOC = 'target_document'; |
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const OPT_IMPLICIT_NS = 'implicit_namespaces'; |
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/** |
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* Holds the HTML5 element names that causes a namespace switch. |
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* |
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* @var array |
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*/ |
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protected $nsRoots = array('html' => self::NAMESPACE_HTML, 'svg' => self::NAMESPACE_SVG, 'math' => self::NAMESPACE_MATHML); |
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/** |
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* Holds the always available namespaces (which does not require the XMLNS declaration). |
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* |
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* @var array |
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*/ |
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protected $implicitNamespaces = array('xml' => self::NAMESPACE_XML, 'xmlns' => self::NAMESPACE_XMLNS, 'xlink' => self::NAMESPACE_XLINK); |
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/** |
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* Holds a stack of currently active namespaces. |
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* |
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* @var array |
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*/ |
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protected $nsStack = array(); |
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/** |
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* Holds the number of namespaces declared by a node. |
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* |
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* @var array |
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*/ |
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protected $pushes = array(); |
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/** |
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* Defined in 8.2.5. |
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*/ |
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const IM_INITIAL = 0; |
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const IM_BEFORE_HTML = 1; |
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const IM_BEFORE_HEAD = 2; |
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const IM_IN_HEAD = 3; |
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const IM_IN_HEAD_NOSCRIPT = 4; |
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const IM_AFTER_HEAD = 5; |
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const IM_IN_BODY = 6; |
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const IM_TEXT = 7; |
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const IM_IN_TABLE = 8; |
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const IM_IN_TABLE_TEXT = 9; |
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const IM_IN_CAPTION = 10; |
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const IM_IN_COLUMN_GROUP = 11; |
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const IM_IN_TABLE_BODY = 12; |
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const IM_IN_ROW = 13; |
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const IM_IN_CELL = 14; |
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const IM_IN_SELECT = 15; |
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const IM_IN_SELECT_IN_TABLE = 16; |
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const IM_AFTER_BODY = 17; |
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const IM_IN_FRAMESET = 18; |
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const IM_AFTER_FRAMESET = 19; |
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const IM_AFTER_AFTER_BODY = 20; |
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const IM_AFTER_AFTER_FRAMESET = 21; |
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const IM_IN_SVG = 22; |
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const IM_IN_MATHML = 23; |
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protected $options = array(); |
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protected $stack = array(); |
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protected $current; |
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// Pointer in the tag hierarchy. |
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protected $rules; |
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protected $doc; |
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protected $frag; |
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protected $processor; |
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protected $insertMode = 0; |
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/** |
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* Track if we are in an element that allows only inline child nodes. |
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* |
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* @var string|null |
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*/ |
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protected $onlyInline; |
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/** |
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* Quirks mode is enabled by default. |
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* Any document that is missing the DT will be considered to be in quirks mode. |
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*/ |
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protected $quirks = \true; |
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protected $errors = array(); |
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public function __construct($isFragment = \false, array $options = array()) |
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{ |
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$this->options = $options; |
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if (isset($options[self::OPT_TARGET_DOC])) { |
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$this->doc = $options[self::OPT_TARGET_DOC]; |
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} else { |
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$impl = new \DOMImplementation(); |
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// XXX: |
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// Create the doctype. For now, we are always creating HTML5 |
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// documents, and attempting to up-convert any older DTDs to HTML5. |
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$dt = $impl->createDocumentType('html'); |
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// $this->doc = \DOMImplementation::createDocument(NULL, 'html', $dt); |
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$this->doc = $impl->createDocument(null, '', $dt); |
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$this->doc->encoding = !empty($options['encoding']) ? $options['encoding'] : 'UTF-8'; |
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} |
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$this->errors = array(); |
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$this->current = $this->doc; |
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// ->documentElement; |
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// Create a rules engine for tags. |
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$this->rules = new TreeBuildingRules(); |
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$implicitNS = array(); |
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if (isset($this->options[self::OPT_IMPLICIT_NS])) { |
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$implicitNS = $this->options[self::OPT_IMPLICIT_NS]; |
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} elseif (isset($this->options['implicitNamespaces'])) { |
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$implicitNS = $this->options['implicitNamespaces']; |
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} |
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// Fill $nsStack with the defalut HTML5 namespaces, plus the "implicitNamespaces" array taken form $options |
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\array_unshift($this->nsStack, $implicitNS + array('' => self::NAMESPACE_HTML) + $this->implicitNamespaces); |
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if ($isFragment) { |
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$this->insertMode = static::IM_IN_BODY; |
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$this->frag = $this->doc->createDocumentFragment(); |
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$this->current = $this->frag; |
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} |
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} |
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/** |
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* Get the document. |
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*/ |
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public function document() |
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{ |
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return $this->doc; |
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} |
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/** |
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* Get the DOM fragment for the body. |
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* |
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* This returns a DOMNodeList because a fragment may have zero or more |
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* DOMNodes at its root. |
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* |
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* @see http://www.w3.org/TR/2012/CR-html5-20121217/syntax.html#concept-frag-parse-context |
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* |
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* @return \DOMDocumentFragment |
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*/ |
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public function fragment() |
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{ |
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return $this->frag; |
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} |
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/** |
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* Provide an instruction processor. |
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* |
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* This is used for handling Processor Instructions as they are |
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* inserted. If omitted, PI's are inserted directly into the DOM tree. |
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* |
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* @param InstructionProcessor $proc |
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*/ |
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public function setInstructionProcessor(InstructionProcessor $proc) |
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{ |
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$this->processor = $proc; |
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} |
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public function doctype($name, $idType = 0, $id = null, $quirks = \false) |
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{ |
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// This is used solely for setting quirks mode. Currently we don't |
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// try to preserve the inbound DT. We convert it to HTML5. |
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$this->quirks = $quirks; |
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if ($this->insertMode > static::IM_INITIAL) { |
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$this->parseError('Illegal placement of DOCTYPE tag. Ignoring: ' . $name); |
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return; |
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} |
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$this->insertMode = static::IM_BEFORE_HTML; |
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} |
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/** |
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* Process the start tag. |
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* |
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* @todo - XMLNS namespace handling (we need to parse, even if it's not valid) |
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* - XLink, MathML and SVG namespace handling |
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* - Omission rules: 8.1.2.4 Optional tags |
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* |
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* @param string $name |
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* @param array $attributes |
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* @param bool $selfClosing |
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* |
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* @return int |
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*/ |
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public function startTag($name, $attributes = array(), $selfClosing = \false) |
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{ |
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$lname = $this->normalizeTagName($name); |
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// Make sure we have an html element. |
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if (!$this->doc->documentElement && 'html' !== $name && !$this->frag) { |
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$this->startTag('html'); |
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} |
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// Set quirks mode if we're at IM_INITIAL with no doctype. |
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if ($this->insertMode === static::IM_INITIAL) { |
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$this->quirks = \true; |
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$this->parseError('No DOCTYPE specified.'); |
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} |
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// SPECIAL TAG HANDLING: |
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// Spec says do this, and "don't ask." |
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// find the spec where this is defined... looks problematic |
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if ('image' === $name && !($this->insertMode === static::IM_IN_SVG || $this->insertMode === static::IM_IN_MATHML)) { |
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$name = 'img'; |
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} |
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// Autoclose p tags where appropriate. |
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if ($this->insertMode >= static::IM_IN_BODY && Elements::isA($name, Elements::AUTOCLOSE_P)) { |
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$this->autoclose('p'); |
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} |
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// Set insert mode: |
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switch ($name) { |
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case 'html': |
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$this->insertMode = static::IM_BEFORE_HEAD; |
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break; |
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case 'head': |
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if ($this->insertMode > static::IM_BEFORE_HEAD) { |
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$this->parseError('Unexpected head tag outside of head context.'); |
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} else { |
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$this->insertMode = static::IM_IN_HEAD; |
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} |
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break; |
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case 'body': |
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$this->insertMode = static::IM_IN_BODY; |
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break; |
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case 'svg': |
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$this->insertMode = static::IM_IN_SVG; |
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break; |
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case 'math': |
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$this->insertMode = static::IM_IN_MATHML; |
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break; |
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case 'noscript': |
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if ($this->insertMode === static::IM_IN_HEAD) { |
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$this->insertMode = static::IM_IN_HEAD_NOSCRIPT; |
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} |
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break; |
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} |
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// Special case handling for SVG. |
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if ($this->insertMode === static::IM_IN_SVG) { |
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$lname = Elements::normalizeSvgElement($lname); |
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} |
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$pushes = 0; |
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// when we found a tag thats appears inside $nsRoots, we have to switch the defalut namespace |
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if (isset($this->nsRoots[$lname]) && $this->nsStack[0][''] !== $this->nsRoots[$lname]) { |
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\array_unshift($this->nsStack, array('' => $this->nsRoots[$lname]) + $this->nsStack[0]); |
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++$pushes; |
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} |
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$needsWorkaround = \false; |
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if (isset($this->options['xmlNamespaces']) && $this->options['xmlNamespaces']) { |
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// when xmlNamespaces is true a and we found a 'xmlns' or 'xmlns:*' attribute, we should add a new item to the $nsStack |
| 264 |
foreach ($attributes as $aName => $aVal) { |
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if ('xmlns' === $aName) { |
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$needsWorkaround = $aVal; |
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\array_unshift($this->nsStack, array('' => $aVal) + $this->nsStack[0]); |
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++$pushes; |
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} elseif ('xmlns' === (($pos = \strpos($aName, ':')) ? \substr($aName, 0, $pos) : '')) { |
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\array_unshift($this->nsStack, array(\substr($aName, $pos + 1) => $aVal) + $this->nsStack[0]); |
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++$pushes; |
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} |
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} |
| 274 |
} |
| 275 |
if ($this->onlyInline && Elements::isA($lname, Elements::BLOCK_TAG)) { |
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$this->autoclose($this->onlyInline); |
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$this->onlyInline = null; |
| 278 |
} |
| 279 |
// some elements as table related tags might have optional end tags that force us to auto close multiple tags |
| 280 |
// https://www.w3.org/TR/html401/struct/tables.html |
| 281 |
if ($this->current instanceof \DOMElement && isset(Elements::$optionalEndElementsParentsToClose[$lname])) { |
| 282 |
foreach (Elements::$optionalEndElementsParentsToClose[$lname] as $parentElName) { |
| 283 |
if ($this->current instanceof \DOMElement && $this->current->tagName === $parentElName) { |
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$this->autoclose($parentElName); |
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} |
| 286 |
} |
| 287 |
} |
| 288 |
try { |
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$prefix = ($pos = \strpos($lname, ':')) ? \substr($lname, 0, $pos) : ''; |
| 290 |
if (\false !== $needsWorkaround) { |
| 291 |
$xml = "<{$lname} xmlns=\"{$needsWorkaround}\" " . (\strlen($prefix) && isset($this->nsStack[0][$prefix]) ? "xmlns:{$prefix}=\"" . $this->nsStack[0][$prefix] . '"' : '') . '/>'; |
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$frag = new \DOMDocument('1.0', 'UTF-8'); |
| 293 |
$frag->loadXML($xml); |
| 294 |
$ele = $this->doc->importNode($frag->documentElement, \true); |
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} else { |
| 296 |
if (!isset($this->nsStack[0][$prefix]) || '' === $prefix && isset($this->options[self::OPT_DISABLE_HTML_NS]) && $this->options[self::OPT_DISABLE_HTML_NS]) { |
| 297 |
$ele = $this->doc->createElement($lname); |
| 298 |
} else { |
| 299 |
$ele = $this->doc->createElementNS($this->nsStack[0][$prefix], $lname); |
| 300 |
} |
| 301 |
} |
| 302 |
} catch (\DOMException $e) { |
| 303 |
$this->parseError("Illegal tag name: <{$lname}>. Replaced with <invalid>."); |
| 304 |
$ele = $this->doc->createElement('invalid'); |
| 305 |
} |
| 306 |
if (Elements::isA($lname, Elements::BLOCK_ONLY_INLINE)) { |
| 307 |
$this->onlyInline = $lname; |
| 308 |
} |
| 309 |
// When we add some namespacess, we have to track them. Later, when "endElement" is invoked, we have to remove them. |
| 310 |
// When we are on a void tag, we do not need to care about namesapce nesting. |
| 311 |
if ($pushes > 0 && !Elements::isA($name, Elements::VOID_TAG)) { |
| 312 |
// PHP tends to free the memory used by DOM, |
| 313 |
// to avoid spl_object_hash collisions whe have to avoid garbage collection of $ele storing it into $pushes |
| 314 |
// see https://bugs.php.net/bug.php?id=67459 |
| 315 |
$this->pushes[\spl_object_hash($ele)] = array($pushes, $ele); |
| 316 |
} |
| 317 |
foreach ($attributes as $aName => $aVal) { |
| 318 |
// xmlns attributes can't be set |
| 319 |
if ('xmlns' === $aName) { |
| 320 |
continue; |
| 321 |
} |
| 322 |
if ($this->insertMode === static::IM_IN_SVG) { |
| 323 |
$aName = Elements::normalizeSvgAttribute($aName); |
| 324 |
} elseif ($this->insertMode === static::IM_IN_MATHML) { |
| 325 |
$aName = Elements::normalizeMathMlAttribute($aName); |
| 326 |
} |
| 327 |
$aVal = (string) $aVal; |
| 328 |
try { |
| 329 |
$prefix = ($pos = \strpos($aName, ':')) ? \substr($aName, 0, $pos) : \false; |
| 330 |
if ('xmlns' === $prefix) { |
| 331 |
$ele->setAttributeNS(self::NAMESPACE_XMLNS, $aName, $aVal); |
| 332 |
} elseif (\false !== $prefix && isset($this->nsStack[0][$prefix])) { |
| 333 |
$ele->setAttributeNS($this->nsStack[0][$prefix], $aName, $aVal); |
| 334 |
} else { |
| 335 |
$ele->setAttribute($aName, $aVal); |
| 336 |
} |
| 337 |
} catch (\DOMException $e) { |
| 338 |
$this->parseError("Illegal attribute name for tag {$name}. Ignoring: {$aName}"); |
| 339 |
continue; |
| 340 |
} |
| 341 |
// This is necessary on a non-DTD schema, like HTML5. |
| 342 |
if ('id' === $aName) { |
| 343 |
$ele->setIdAttribute('id', \true); |
| 344 |
} |
| 345 |
} |
| 346 |
if ($this->frag !== $this->current && $this->rules->hasRules($name)) { |
| 347 |
// Some elements have special processing rules. Handle those separately. |
| 348 |
$this->current = $this->rules->evaluate($ele, $this->current); |
| 349 |
} else { |
| 350 |
// Otherwise, it's a standard element. |
| 351 |
$this->current->appendChild($ele); |
| 352 |
if (!Elements::isA($name, Elements::VOID_TAG)) { |
| 353 |
$this->current = $ele; |
| 354 |
} |
| 355 |
// Self-closing tags should only be respected on foreign elements |
| 356 |
// (and are implied on void elements) |
| 357 |
// See: https://www.w3.org/TR/html5/syntax.html#start-tags |
| 358 |
if (Elements::isHtml5Element($name)) { |
| 359 |
$selfClosing = \false; |
| 360 |
} |
| 361 |
} |
| 362 |
// This is sort of a last-ditch attempt to correct for cases where no head/body |
| 363 |
// elements are provided. |
| 364 |
if ($this->insertMode <= static::IM_BEFORE_HEAD && 'head' !== $name && 'html' !== $name) { |
| 365 |
$this->insertMode = static::IM_IN_BODY; |
| 366 |
} |
| 367 |
// When we are on a void tag, we do not need to care about namesapce nesting, |
| 368 |
// but we have to remove the namespaces pushed to $nsStack. |
| 369 |
if ($pushes > 0 && Elements::isA($name, Elements::VOID_TAG)) { |
| 370 |
// remove the namespaced definded by current node |
| 371 |
for ($i = 0; $i < $pushes; ++$i) { |
| 372 |
\array_shift($this->nsStack); |
| 373 |
} |
| 374 |
} |
| 375 |
if ($selfClosing) { |
| 376 |
$this->endTag($name); |
| 377 |
} |
| 378 |
// Return the element mask, which the tokenizer can then use to set |
| 379 |
// various processing rules. |
| 380 |
return Elements::element($name); |
| 381 |
} |
| 382 |
public function endTag($name) |
| 383 |
{ |
| 384 |
$lname = $this->normalizeTagName($name); |
| 385 |
// Special case within 12.2.6.4.7: An end tag whose tag name is "br" should be treated as an opening tag |
| 386 |
if ('br' === $name) { |
| 387 |
$this->parseError('Closing tag encountered for void element br.'); |
| 388 |
$this->startTag('br'); |
| 389 |
} elseif (Elements::isA($name, Elements::VOID_TAG)) { |
| 390 |
return; |
| 391 |
} |
| 392 |
if ($this->insertMode <= static::IM_BEFORE_HTML) { |
| 393 |
// 8.2.5.4.2 |
| 394 |
if (\in_array($name, array('html', 'br', 'head', 'title'))) { |
| 395 |
$this->startTag('html'); |
| 396 |
$this->endTag($name); |
| 397 |
$this->insertMode = static::IM_BEFORE_HEAD; |
| 398 |
return; |
| 399 |
} |
| 400 |
// Ignore the tag. |
| 401 |
$this->parseError('Illegal closing tag at global scope.'); |
| 402 |
return; |
| 403 |
} |
| 404 |
// Special case handling for SVG. |
| 405 |
if ($this->insertMode === static::IM_IN_SVG) { |
| 406 |
$lname = Elements::normalizeSvgElement($lname); |
| 407 |
} |
| 408 |
$cid = \spl_object_hash($this->current); |
| 409 |
// XXX: HTML has no parent. What do we do, though, |
| 410 |
// if this element appears in the wrong place? |
| 411 |
if ('html' === $lname) { |
| 412 |
return; |
| 413 |
} |
| 414 |
// remove the namespaced definded by current node |
| 415 |
if (isset($this->pushes[$cid])) { |
| 416 |
for ($i = 0; $i < $this->pushes[$cid][0]; ++$i) { |
| 417 |
\array_shift($this->nsStack); |
| 418 |
} |
| 419 |
unset($this->pushes[$cid]); |
| 420 |
} |
| 421 |
if (!$this->autoclose($lname)) { |
| 422 |
$this->parseError('Could not find closing tag for ' . $lname); |
| 423 |
} |
| 424 |
switch ($lname) { |
| 425 |
case 'head': |
| 426 |
$this->insertMode = static::IM_AFTER_HEAD; |
| 427 |
break; |
| 428 |
case 'body': |
| 429 |
$this->insertMode = static::IM_AFTER_BODY; |
| 430 |
break; |
| 431 |
case 'svg': |
| 432 |
case 'mathml': |
| 433 |
$this->insertMode = static::IM_IN_BODY; |
| 434 |
break; |
| 435 |
} |
| 436 |
} |
| 437 |
public function comment($cdata) |
| 438 |
{ |
| 439 |
// TODO: Need to handle case where comment appears outside of the HTML tag. |
| 440 |
$node = $this->doc->createComment($cdata); |
| 441 |
$this->current->appendChild($node); |
| 442 |
} |
| 443 |
public function text($data) |
| 444 |
{ |
| 445 |
// XXX: Hmmm.... should we really be this strict? |
| 446 |
if ($this->insertMode < static::IM_IN_HEAD) { |
| 447 |
// Per '8.2.5.4.3 The "before head" insertion mode' the characters |
| 448 |
// " \t\n\r\f" should be ignored but no mention of a parse error. This is |
| 449 |
// practical as most documents contain these characters. Other text is not |
| 450 |
// expected here so recording a parse error is necessary. |
| 451 |
$dataTmp = \trim($data, " \t\n\r\f"); |
| 452 |
if (!empty($dataTmp)) { |
| 453 |
// fprintf(STDOUT, "Unexpected insert mode: %d", $this->insertMode); |
| 454 |
$this->parseError('Unexpected text. Ignoring: ' . $dataTmp); |
| 455 |
} |
| 456 |
return; |
| 457 |
} |
| 458 |
// fprintf(STDOUT, "Appending text %s.", $data); |
| 459 |
$node = $this->doc->createTextNode($data); |
| 460 |
$this->current->appendChild($node); |
| 461 |
} |
| 462 |
public function eof() |
| 463 |
{ |
| 464 |
// If the $current isn't the $root, do we need to do anything? |
| 465 |
} |
| 466 |
public function parseError($msg, $line = 0, $col = 0) |
| 467 |
{ |
| 468 |
$this->errors[] = \sprintf('Line %d, Col %d: %s', $line, $col, $msg); |
| 469 |
} |
| 470 |
public function getErrors() |
| 471 |
{ |
| 472 |
return $this->errors; |
| 473 |
} |
| 474 |
public function cdata($data) |
| 475 |
{ |
| 476 |
$node = $this->doc->createCDATASection($data); |
| 477 |
$this->current->appendChild($node); |
| 478 |
} |
| 479 |
public function processingInstruction($name, $data = null) |
| 480 |
{ |
| 481 |
// XXX: Ignore initial XML declaration, per the spec. |
| 482 |
if ($this->insertMode === static::IM_INITIAL && 'xml' === \strtolower($name)) { |
| 483 |
return; |
| 484 |
} |
| 485 |
// Important: The processor may modify the current DOM tree however it sees fit. |
| 486 |
if ($this->processor instanceof InstructionProcessor) { |
| 487 |
$res = $this->processor->process($this->current, $name, $data); |
| 488 |
if (!empty($res)) { |
| 489 |
$this->current = $res; |
| 490 |
} |
| 491 |
return; |
| 492 |
} |
| 493 |
// Otherwise, this is just a dumb PI element. |
| 494 |
$node = $this->doc->createProcessingInstruction($name, $data); |
| 495 |
$this->current->appendChild($node); |
| 496 |
} |
| 497 |
// ========================================================================== |
| 498 |
// UTILITIES |
| 499 |
// ========================================================================== |
| 500 |
/** |
| 501 |
* Apply normalization rules to a tag name. |
| 502 |
* See sections 2.9 and 8.1.2. |
| 503 |
* |
| 504 |
* @param string $tagName |
| 505 |
* |
| 506 |
* @return string The normalized tag name. |
| 507 |
*/ |
| 508 |
protected function normalizeTagName($tagName) |
| 509 |
{ |
| 510 |
/* |
| 511 |
* 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); } |
| 512 |
*/ |
| 513 |
return $tagName; |
| 514 |
} |
| 515 |
protected function quirksTreeResolver($name) |
| 516 |
{ |
| 517 |
throw new \Exception('Not implemented.'); |
| 518 |
} |
| 519 |
/** |
| 520 |
* Automatically climb the tree and close the closest node with the matching $tag. |
| 521 |
* |
| 522 |
* @param string $tagName |
| 523 |
* |
| 524 |
* @return bool |
| 525 |
*/ |
| 526 |
protected function autoclose($tagName) |
| 527 |
{ |
| 528 |
$working = $this->current; |
| 529 |
do { |
| 530 |
if (\XML_ELEMENT_NODE !== $working->nodeType) { |
| 531 |
return \false; |
| 532 |
} |
| 533 |
if ($working->tagName === $tagName) { |
| 534 |
$this->current = $working->parentNode; |
| 535 |
return \true; |
| 536 |
} |
| 537 |
} while ($working = $working->parentNode); |
| 538 |
return \false; |
| 539 |
} |
| 540 |
/** |
| 541 |
* Checks if the given tagname is an ancestor of the present candidate. |
| 542 |
* |
| 543 |
* If $this->current or anything above $this->current matches the given tag |
| 544 |
* name, this returns true. |
| 545 |
* |
| 546 |
* @param string $tagName |
| 547 |
* |
| 548 |
* @return bool |
| 549 |
*/ |
| 550 |
protected function isAncestor($tagName) |
| 551 |
{ |
| 552 |
$candidate = $this->current; |
| 553 |
while (\XML_ELEMENT_NODE === $candidate->nodeType) { |
| 554 |
if ($candidate->tagName === $tagName) { |
| 555 |
return \true; |
| 556 |
} |
| 557 |
$candidate = $candidate->parentNode; |
| 558 |
} |
| 559 |
return \false; |
| 560 |
} |
| 561 |
/** |
| 562 |
* Returns true if the immediate parent element is of the given tagname. |
| 563 |
* |
| 564 |
* @param string $tagName |
| 565 |
* |
| 566 |
* @return bool |
| 567 |
*/ |
| 568 |
protected function isParent($tagName) |
| 569 |
{ |
| 570 |
return $this->current->tagName === $tagName; |
| 571 |
} |
| 572 |
} |
| 573 |
|
