698 lines
22 KiB
PHP
698 lines
22 KiB
PHP
<?php
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namespace Masterminds\HTML5\Parser;
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use Masterminds\HTML5\Elements;
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use 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(
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'html' => self::NAMESPACE_HTML,
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'svg' => self::NAMESPACE_SVG,
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'math' => self::NAMESPACE_MATHML,
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);
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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(
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'xml' => self::NAMESPACE_XML,
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'xmlns' => self::NAMESPACE_XMLNS,
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'xlink' => self::NAMESPACE_XLINK,
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);
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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; // 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, 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 = $this->doc; // ->documentElement;
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// Create a rules engine for tags.
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$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(
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'' => $this->nsRoots[$lname],
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) + $this->nsStack[0]);
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++$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 $nsStack
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foreach ($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(
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'' => $aVal,
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) + $this->nsStack[0]);
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++$pushes;
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} elseif ('xmlns' === (($pos = strpos($aName, ':')) ? substr($aName, 0, $pos) : '')) {
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array_unshift($this->nsStack, array(
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substr($aName, $pos + 1) => $aVal,
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) + $this->nsStack[0]);
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++$pushes;
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}
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}
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}
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if ($this->onlyInline && Elements::isA($lname, Elements::BLOCK_TAG)) {
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$this->autoclose($this->onlyInline);
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$this->onlyInline = null;
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}
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try {
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$prefix = ($pos = strpos($lname, ':')) ? substr($lname, 0, $pos) : '';
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if (false !== $needsWorkaround) {
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$xml = "<$lname xmlns=\"$needsWorkaround\" " . (strlen($prefix) && isset($this->nsStack[0][$prefix]) ? ("xmlns:$prefix=\"" . $this->nsStack[0][$prefix] . '"') : '') . '/>';
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$frag = new \DOMDocument('1.0', 'UTF-8');
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$frag->loadXML($xml);
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$ele = $this->doc->importNode($frag->documentElement, true);
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} else {
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if (!isset($this->nsStack[0][$prefix]) || ('' === $prefix && isset($this->options[self::OPT_DISABLE_HTML_NS]) && $this->options[self::OPT_DISABLE_HTML_NS])) {
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$ele = $this->doc->createElement($lname);
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} else {
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$ele = $this->doc->createElementNS($this->nsStack[0][$prefix], $lname);
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}
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}
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} catch (\DOMException $e) {
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$this->parseError("Illegal tag name: <$lname>. Replaced with <invalid>.");
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$ele = $this->doc->createElement('invalid');
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}
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if (Elements::isA($lname, Elements::BLOCK_ONLY_INLINE)) {
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$this->onlyInline = $lname;
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}
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// When we add some namespacess, we have to track them. Later, when "endElement" is invoked, we have to remove them.
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// When we are on a void tag, we do not need to care about namesapce nesting.
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if ($pushes > 0 && !Elements::isA($name, Elements::VOID_TAG)) {
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// PHP tends to free the memory used by DOM,
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// to avoid spl_object_hash collisions whe have to avoid garbage collection of $ele storing it into $pushes
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// see https://bugs.php.net/bug.php?id=67459
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$this->pushes[spl_object_hash($ele)] = array($pushes, $ele);
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}
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foreach ($attributes as $aName => $aVal) {
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// xmlns attributes can't be set
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if ('xmlns' === $aName) {
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continue;
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}
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if ($this->insertMode === static::IM_IN_SVG) {
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$aName = Elements::normalizeSvgAttribute($aName);
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} elseif ($this->insertMode === static::IM_IN_MATHML) {
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$aName = Elements::normalizeMathMlAttribute($aName);
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}
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try {
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$prefix = ($pos = strpos($aName, ':')) ? substr($aName, 0, $pos) : false;
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if ('xmlns' === $prefix) {
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$ele->setAttributeNS(self::NAMESPACE_XMLNS, $aName, $aVal);
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} elseif (false !== $prefix && isset($this->nsStack[0][$prefix])) {
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$ele->setAttributeNS($this->nsStack[0][$prefix], $aName, $aVal);
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} else {
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$ele->setAttribute($aName, $aVal);
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}
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} catch (\DOMException $e) {
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$this->parseError("Illegal attribute name for tag $name. Ignoring: $aName");
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continue;
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}
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// This is necessary on a non-DTD schema, like HTML5.
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if ('id' === $aName) {
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$ele->setIdAttribute('id', true);
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}
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}
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if ($this->frag !== $this->current && $this->rules->hasRules($name)) {
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// Some elements have special processing rules. Handle those separately.
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$this->current = $this->rules->evaluate($ele, $this->current);
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} else {
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// Otherwise, it's a standard element.
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$this->current->appendChild($ele);
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if (!Elements::isA($name, Elements::VOID_TAG)) {
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$this->current = $ele;
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}
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// Self-closing tags should only be respected on foreign elements
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// (and are implied on void elements)
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// See: https://www.w3.org/TR/html5/syntax.html#start-tags
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if (Elements::isHtml5Element($name)) {
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$selfClosing = false;
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}
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}
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// This is sort of a last-ditch attempt to correct for cases where no head/body
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// elements are provided.
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if ($this->insertMode <= static::IM_BEFORE_HEAD && 'head' !== $name && 'html' !== $name) {
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$this->insertMode = static::IM_IN_BODY;
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}
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// When we are on a void tag, we do not need to care about namesapce nesting,
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// but we have to remove the namespaces pushed to $nsStack.
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if ($pushes > 0 && Elements::isA($name, Elements::VOID_TAG)) {
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// remove the namespaced definded by current node
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for ($i = 0; $i < $pushes; ++$i) {
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array_shift($this->nsStack);
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}
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}
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if ($selfClosing) {
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$this->endTag($name);
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}
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// Return the element mask, which the tokenizer can then use to set
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// various processing rules.
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return Elements::element($name);
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}
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public function endTag($name)
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{
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$lname = $this->normalizeTagName($name);
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// Ignore closing tags for unary elements.
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if (Elements::isA($name, Elements::VOID_TAG)) {
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return;
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}
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if ($this->insertMode <= static::IM_BEFORE_HTML) {
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// 8.2.5.4.2
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if (in_array($name, array(
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'html',
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'br',
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'head',
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'title',
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))) {
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$this->startTag('html');
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$this->endTag($name);
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$this->insertMode = static::IM_BEFORE_HEAD;
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return;
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}
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// Ignore the tag.
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$this->parseError('Illegal closing tag at global scope.');
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return;
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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($lname);
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}
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$cid = spl_object_hash($this->current);
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// XXX: HTML has no parent. What do we do, though,
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// if this element appears in the wrong place?
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if ('html' === $lname) {
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return;
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}
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// remove the namespaced definded by current node
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if (isset($this->pushes[$cid])) {
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for ($i = 0; $i < $this->pushes[$cid][0]; ++$i) {
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array_shift($this->nsStack);
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}
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unset($this->pushes[$cid]);
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}
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if (!$this->autoclose($lname)) {
|
|
$this->parseError('Could not find closing tag for ' . $lname);
|
|
}
|
|
|
|
switch ($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($name)) {
|
|
return;
|
|
}
|
|
|
|
// Important: The processor may modify the current DOM tree however it sees fit.
|
|
if ($this->processor instanceof InstructionProcessor) {
|
|
$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 $tagName
|
|
*
|
|
* @return string The normalized tag name.
|
|
*/
|
|
protected function normalizeTagName($tagName)
|
|
{
|
|
/*
|
|
* 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 $tagName;
|
|
}
|
|
|
|
protected function quirksTreeResolver($name)
|
|
{
|
|
throw new \Exception('Not implemented.');
|
|
}
|
|
|
|
/**
|
|
* Automatically climb the tree and close the closest node with the matching $tag.
|
|
*
|
|
* @param string $tagName
|
|
*
|
|
* @return bool
|
|
*/
|
|
protected function autoclose($tagName)
|
|
{
|
|
$working = $this->current;
|
|
do {
|
|
if (XML_ELEMENT_NODE !== $working->nodeType) {
|
|
return false;
|
|
}
|
|
if ($working->tagName === $tagName) {
|
|
$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.
|
|
*
|
|
* @param string $tagName
|
|
*
|
|
* @return bool
|
|
*/
|
|
protected function isAncestor($tagName)
|
|
{
|
|
$candidate = $this->current;
|
|
while (XML_ELEMENT_NODE === $candidate->nodeType) {
|
|
if ($candidate->tagName === $tagName) {
|
|
return true;
|
|
}
|
|
$candidate = $candidate->parentNode;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Returns true if the immediate parent element is of the given tagname.
|
|
*
|
|
* @param string $tagName
|
|
*
|
|
* @return bool
|
|
*/
|
|
protected function isParent($tagName)
|
|
{
|
|
return $this->current->tagName === $tagName;
|
|
}
|
|
}
|