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20260721_154033.php
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# The Parser Model The parser model here follows the model in section [8.2.1](http://www.w3.org/TR/2012/CR-html5-20121217/syntax.html#parsing) of the HTML5 specification, though we do not assume a networking layer. [ InputStream ] // Generic support for reading input. || [ Scanner ] // Breaks down the stream into characters. || [ Tokenizer ] // Groups characters into syntactic || [ Tree Builder ] // Organizes units into a tree of objects || [ DOM Document ] // The final state of the parsed document. ## InputStream This is an interface with at least two concrete implementations: - StringInputStream: Reads an HTML5 string. - FileInputStream: Reads an HTML5 file. ## Scanner This is a mechanical piece of the parser. ## Tokenizer This follows section 8.4 of the HTML5 spec. It is (roughly) a recursive descent parser. (Though there are plenty of optimizations that are less than purely functional. ## EventHandler and DOMTree EventHandler is the interface for tree builders. Since not all implementations will necessarily build trees, we've chosen a more generic name. The event handler emits tokens during tokenization. The DOMTree is an event handler that builds a DOM tree. The output of the DOMTree builder is a DOMDocument. ## DOMDocument PHP has a DOMDocument class built-in (technically, it's part of libxml.) We use that, thus rendering the output of this process compatible with SimpleXML, QueryPath, and many other XML/HTML processing tools. For cases where the HTML5 is a fragment of a HTML5 document a DOMDocumentFragment is returned instead. This is another built-in class.