--- /dev/null
+<?php
+
+namespace RemexHtml\TreeBuilder;
+use RemexHtml\HTMLData;
+use RemexHtml\PropGuard;
+use RemexHtml\Tokenizer\Attributes;
+
+/**
+ * Storage for all the state that TreeBuilder needs to associate with each
+ * element. These objects should be freed once they fall out of TreeBuilder's
+ * data structures (the stack etc.).
+ *
+ * These objects are also used to communicate information about elements with
+ * downstream clients.
+ */
+class Element implements FormattingElement {
+ /**
+ * The namespace. This will be the HTML namespace for elements that are not
+ * in foreign content, even if there is a prefix.
+ * @var string
+ */
+ public $namespace;
+
+ /**
+ * The tag name, usually exactly as it appeared in the source document.
+ * This is not strictly a local name, since it still contains a colon for
+ * prefixed elements. In foreign content, it is effectively a local name.
+ * It is suitable for use as a serialized tag name.
+ * @var string
+ */
+ public $name;
+
+ /**
+ * This is an internal designation of the type of the element, which is
+ * equal to the tag name when the element is in the HTML namespace, and is
+ * some other string when the element is not in the HTML namespace.
+ * @var string
+ */
+ public $htmlName;
+
+ /**
+ * @var Attributes
+ */
+ public $attrs;
+
+ /**
+ * This is true if the element was created by the TreeBuilder either as a
+ * fragment context node, or as a synthetic <html> element to be used as
+ * the top-level element in fragment parsing.
+ * @var bool
+ */
+ public $isVirtual;
+
+ /**
+ * Internal to CachingStack. A link in the scope list.
+ */
+ public $nextScope;
+
+ /**
+ * Internal to CachingStack and SimpleStack. The current stack index, or
+ * null if the element is not in the stack.
+ */
+ public $stackIndex;
+
+ /**
+ * Internal to ActiveFormattingElements.
+ */
+ public $prevAFE, $nextAFE, $nextNoah;
+
+ /**
+ * The cache for getNoahKey()
+ */
+ private $noahKey;
+
+ /**
+ * This member variable can be written to by the TreeHandler, to store any
+ * state associated with the element (such as a DOM node). It is not used
+ * by TreeBuilder.
+ */
+ public $userData;
+
+ /**
+ * The element types in the MathML namespace which are MathML text
+ * integration points.
+ * @var string[bool]
+ */
+ private static $mathmlIntegration = [
+ 'mi' => true,
+ 'mo' => true,
+ 'mn' => true,
+ 'ms' => true,
+ 'mtext' => true
+ ];
+
+ /**
+ * The element types in the SVG namespace which are SVG text integration
+ * points.
+ * @var string[bool]
+ */
+ private static $svgHtmlIntegration = [
+ 'foreignObject' => true,
+ 'desc' => true,
+ 'title' => true
+ ];
+
+ /**
+ * Constructor.
+ *
+ * @param string $namespace
+ * @param string $name
+ * @param Attributes $attrs
+ */
+ public function __construct( $namespace, $name, Attributes $attrs ) {
+ $this->namespace = $namespace;
+ $this->name = $name;
+ if ( $namespace === HTMLData::NS_HTML ) {
+ $this->htmlName = $name;
+ } elseif ( $namespace === HTMLData::NS_MATHML ) {
+ $this->htmlName = "mathml $name";
+ } elseif ( $namespace === HTMLData::NS_SVG ) {
+ $this->htmlName = "svg $name";
+ } else {
+ $this->htmlName = "$namespace $name";
+ }
+ $this->attrs = $attrs;
+ }
+
+ public function __set( $name, $value ) {
+ PropGuard::set( $this, $name, $value );
+ }
+
+ /**
+ * Is the element a MathML text integration point?
+ *
+ * @return bool
+ */
+ public function isMathmlTextIntegration() {
+ return $this->namespace === HTMLData::NS_MATHML
+ && isset( self::$mathmlIntegration[$this->name] );
+ }
+
+ /**
+ * Is the element an HTML integration point?
+ */
+ public function isHtmlIntegration() {
+ if ( $this->namespace === HTMLData::NS_MATHML ) {
+ if ( isset( $this->attrs['encoding'] ) ) {
+ $encoding = strtolower( $this->attrs['encoding'] );
+ return $encoding === 'text/html' || $encoding === 'application/xhtml+xml';
+ } else {
+ return false;
+ }
+ } elseif ( $this->namespace === HTMLData::NS_SVG ) {
+ return isset( self::$svgHtmlIntegration[$this->name] );
+ } else {
+ return false;
+ }
+ }
+
+ /**
+ * Get a string key for the Noah's Ark algorithm
+ *
+ * @return string
+ */
+ public function getNoahKey() {
+ if ( $this->noahKey === null ) {
+ $attrs = $this->attrs->getValues();
+ ksort( $attrs );
+ $this->noahKey = serialize( [ $this->htmlName, $attrs ] );
+ }
+ return $this->noahKey;
+ }
+
+ /**
+ * Get a string identifying the element, for use in debugging.
+ */
+ public function getDebugTag() {
+ return $this->htmlName . '#' . substr( md5( spl_object_hash( $this ) ), 0, 8 );
+ }
+}
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