1059 lines
29 KiB
PHP
1059 lines
29 KiB
PHP
<?php
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namespace HTML5\Parser;
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use HTML5\Elements;
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/**
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* The HTML5 tokenizer.
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*
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* The tokenizer's role is reading data from the scanner and gathering it into
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* semantic units. From the tokenizer, data is emitted to an event handler,
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* which may (for example) create a DOM tree.
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*
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* The HTML5 specification has a detailed explanation of tokenizing HTML5. We
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* follow that specification to the maximum extent that we can. If you find
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* a discrepancy that is not documented, please file a bug and/or submit a
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* patch.
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*
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* This tokenizer is implemented as a recursive descent parser.
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*
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* Within the API documentation, you may see references to the specific section
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* of the HTML5 spec that the code attempts to reproduce. Example: 8.2.4.1.
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* This refers to section 8.2.4.1 of the HTML5 CR specification.
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*
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* @see http://www.w3.org/TR/2012/CR-html5-20121217/
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*/
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class Tokenizer {
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protected $scanner;
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protected $events;
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protected $tok;
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/**
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* Buffer for text.
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*/
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protected $text = '';
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// When this goes to false, the parser stops.
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protected $carryOn = TRUE;
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protected $textMode = 0; // TEXTMODE_NORMAL;
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protected $untilTag = NULL;
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const WHITE="\t\n\f ";
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/**
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* Create a new tokenizer.
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*
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* Typically, parsing a document involves creating a new tokenizer, giving
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* it a scanner (input) and an event handler (output), and then calling
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* the Tokenizer::parse() method.`
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*
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* @param \HTML5\Parser\Scanner $scanner
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* A scanner initialized with an input stream.
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* @param \HTML5\Parser\EventHandler $eventHandler
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* An event handler, initialized and ready to receive
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* events.
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*/
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public function __construct($scanner, $eventHandler) {
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$this->scanner = $scanner;
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$this->events = $eventHandler;
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}
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/**
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* Begin parsing.
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*
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* This will begin scanning the document, tokenizing as it goes.
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* Tokens are emitted into the event handler.
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*
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* Tokenizing will continue until the document is completely
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* read. Errors are emitted into the event handler, but
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* the parser will attempt to continue parsing until the
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* entire input stream is read.
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*/
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public function parse() {
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$p = 0;
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do {
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$p = $this->scanner->position();
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$this->consumeData();
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// FIXME: Add infinite loop protection.
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}
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while ($this->carryOn);
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}
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/**
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* Set the text mode for the character data reader.
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*
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* HTML5 defines three different modes for reading text:
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* - Normal: Read until a tag is encountered.
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* - RCDATA: Read until a tag is encountered, but skip a few otherwise-
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* special characters.
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* - Raw: Read until a special closing tag is encountered (viz. pre, script)
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*
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* This allows those modes to be set.
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*
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* Normally, setting is done by the event handler via a special return code on
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* startTag(), but it can also be set manually using this function.
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*
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* @param integer $textmode
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* One of Elements::TEXT_*
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* @param string $untilTag
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* The tag that should stop RAW or RCDATA mode. Normal mode does not
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* use this indicator.
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*/
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public function setTextMode($textmode, $untilTag = NULL) {
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$this->textMode = $textmode & (Elements::TEXT_RAW | Elements::TEXT_RCDATA);
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$this->untilTag = $untilTag;
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}
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/**
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* Consume a character and make a move.
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* HTML5 8.2.4.1
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*/
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protected function consumeData() {
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// Character Ref
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/*
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$this->characterReference() ||
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$this->tagOpen() ||
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$this->eof() ||
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$this->characterData();
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*/
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$this->characterReference();
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$this->tagOpen();
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$this->eof();
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$this->characterData();
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return $this->carryOn;
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}
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/**
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* Parse anything that looks like character data.
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*
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* Different rules apply based on the current text mode.
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*
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* @see Elements::TEXT_RAW Elements::TEXT_RCDATA.
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*/
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protected function characterData() {
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if ($this->scanner->current() === FALSE) {
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return FALSE;
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}
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switch ($this->textMode) {
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case Elements::TEXT_RAW:
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case Elements::TEXT_RCDATA:
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return $this->rawText();
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default:
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$tok = $this->scanner->current();
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if (strspn($tok, "<&")) {
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return FALSE;
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}
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return $this->text();
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}
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}
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/**
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* This buffers the current token as character data.
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*/
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protected function text() {
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$tok = $this->scanner->current();
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// This should never happen...
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if ($tok === FALSE) {
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return FALSE;
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}
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// Null
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if ($tok === "\00") {
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$this->parseError("Received NULL character.");
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}
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// fprintf(STDOUT, "Writing '%s'", $tok);
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$this->buffer($tok);
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$this->scanner->next();
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return TRUE;
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}
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/**
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* Read text in RAW mode.
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*/
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protected function rawText() {
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if (is_null($this->untilTag)) {
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return $this->text();
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}
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$sequence = '</' . $this->untilTag . '>';
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$txt = $this->readUntilSequence($sequence);
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$this->events->text($txt);
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$this->setTextMode(0);
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return $this->endTag();
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}
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/**
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* If the document is read, emit an EOF event.
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*/
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protected function eof() {
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if ($this->scanner->current() === FALSE) {
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//fprintf(STDOUT, "EOF");
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$this->flushBuffer();
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$this->events->eof();
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$this->carryOn = FALSE;
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return TRUE;
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}
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return FALSE;
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}
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/**
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* Handle character references (aka entities).
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*
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* This version is specific to PCDATA, as it buffers data into the
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* text buffer. For a generic version, see decodeCharacterReference().
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*
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* HTML5 8.2.4.2
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*/
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protected function characterReference() {
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$ref = $this->decodeCharacterReference();
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if ($ref !== FALSE) {
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$this->buffer($ref);
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return TRUE;
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}
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return FALSE;
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}
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/**
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* Emit a tagStart event on encountering a tag.
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*
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* 8.2.4.8
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*/
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protected function tagOpen() {
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if ($this->scanner->current() != '<') {
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return FALSE;
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}
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// Any buffered text data can go out now.
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$this->flushBuffer();
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$this->scanner->next();
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return $this->markupDeclaration() ||
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$this->endTag() ||
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$this->processingInstruction() ||
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$this->tagName() ||
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// This always returns false.
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$this->parseError("Illegal tag opening") ||
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$this->characterData();
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}
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/**
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* Look for markup.
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*/
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protected function markupDeclaration() {
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if ($this->scanner->current() != '!') {
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return FALSE;
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}
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$tok = $this->scanner->next();
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// Comment:
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if ($tok == '-' && $this->scanner->peek() == '-') {
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$this->scanner->next(); // Consume the other '-'
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$this->scanner->next(); // Next char.
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return $this->comment();
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}
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// Doctype
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elseif($tok == 'D' || $tok == 'd') {
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return $this->doctype('');
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}
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// CDATA section
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elseif($tok == '[') {
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return $this->cdataSection();
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}
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// FINISH
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$this->parseError("Expected <!--, <![CDATA[, or <!DOCTYPE. Got <!%s", $tok);
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$this->bogusComment('<!');
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return TRUE;
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}
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/**
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* Consume an end tag.
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* 8.2.4.9
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*/
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protected function endTag() {
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if ($this->scanner->current() != '/') {
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return FALSE;
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}
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$tok = $this->scanner->next();
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// a-zA-Z -> tagname
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// > -> parse error
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// EOF -> parse error
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// -> parse error
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if (!ctype_alpha($tok)) {
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$this->parseError("Expected tag name, got '%s'", $tok);
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if ($tok == "\0" || $tok === FALSE) {
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return FALSE;
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}
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return $this->bogusComment('</');
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}
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$name = strtolower($this->scanner->charsUntil("\n\f \t>"));
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// Trash whitespace.
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$this->scanner->whitespace();
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if ($this->scanner->current() != '>') {
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$this->parseError("Expected >, got '%s'", $this->scanner->current());
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// We just trash stuff until we get to the next tag close.
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$this->scanner->charsUntil('>');
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}
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$this->events->endTag($name);
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$this->scanner->next();
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return TRUE;
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}
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/**
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* Consume a tag name and body.
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* 8.2.4.10
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*/
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protected function tagName() {
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$tok = $this->scanner->current();
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if (!ctype_alpha($tok)) {
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return FALSE;
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}
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// We know this is at least one char.
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$name = strtolower($this->scanner->charsWhile(
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":0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
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));
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$attributes = array();
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$selfClose = FALSE;
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// Handle attribute parse exceptions here so that we can
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// react by trying to build a sensible parse tree.
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try {
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do {
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$this->scanner->whitespace();
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$this->attribute($attributes);
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}
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while (!$this->isTagEnd($selfClose));
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}
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catch (ParseError $e) {
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$selfClose = FALSE;
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}
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$mode = $this->events->startTag($name, $attributes, $selfClose);
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// Should we do this? What does this buy that selfClose doesn't?
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if ($selfClose) {
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$this->events->endTag($name);
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}
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elseif (is_int($mode)) {
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//fprintf(STDOUT, "Event response says move into mode %d for tag %s", $mode, $name);
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$this->setTextMode($mode, $name);
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}
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$this->scanner->next();
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return TRUE;
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}
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/**
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* Check if the scanner has reached the end of a tag.
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*/
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protected function isTagEnd(&$selfClose) {
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$tok = $this->scanner->current();
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if ($tok == '/') {
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$this->scanner->next();
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$this->scanner->whitespace();
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if ($this->scanner->current() == '>') {
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$selfClose = TRUE;
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return TRUE;
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}
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if ($this->scanner->current() === FALSE) {
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$this->parseError("Unexpected EOF inside of tag.");
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return TRUE;
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}
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// Basically, we skip the / token and go on.
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// See 8.2.4.43.
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$this->parseError("Unexpected '%s' inside of a tag.", $this->scanner->current());
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return FALSE;
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}
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if ($this->scanner->current() == '>') {
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return TRUE;
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}
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if ($this->scanner->current() === FALSE) {
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$this->parseError("Unexpected EOF inside of tag.");
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return TRUE;
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}
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return FALSE;
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}
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/**
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* Parse attributes from inside of a tag.
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*/
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protected function attribute(&$attributes) {
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$tok = $this->scanner->current();
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if ($tok == '/' || $tok == '>' || $tok === FALSE) {
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return FALSE;
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}
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if ($tok == '<') {
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$this->parseError("Unexepcted '<' inside of attributes list.");
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// Push the < back onto the stack.
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$this->scanner->unconsume();
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// Let the caller figure out how to handle this.
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throw new ParseError("Start tag inside of attribute.");
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}
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$name = strtolower($this->scanner->charsUntil("/>=\n\f\t "));
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if (strlen($name) == 0) {
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$this->parseError("Expected an attribute name, got %s.", $this->scanner->current());
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// Really, only '=' can be the char here. Everything else gets absorbed
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// under one rule or another.
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$name = $this->scanner->current();
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$this->scanner->next();
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}
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$isValidAttribute = TRUE;
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// Attribute names can contain most Unicode characters for HTML5.
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// But method "DOMElement::setAttribute" is throwing exception
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// because of it's own internal restriction so these have to be filtered.
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// see issue #23: https://github.com/Masterminds/html5-php/issues/23
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// and http://www.w3.org/TR/2011/WD-html5-20110525/syntax.html#syntax-attribute-name
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if (preg_match("/[\x1-\x2C\\/\x3B-\x40\x5B-\x5E\x60\x7B-\x7F]/u", $name)) {
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$this->parseError("Unexpected characters in attribute name: %s", $name);
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$isValidAttribute = FALSE;
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}
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// There is no limitation for 1st character in HTML5.
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// But method "DOMElement::setAttribute" is throwing exception for the
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// characters below so they have to be filtered.
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// see issue #23: https://github.com/Masterminds/html5-php/issues/23
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// and http://www.w3.org/TR/2011/WD-html5-20110525/syntax.html#syntax-attribute-name
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else if (preg_match("/^[0-9.-]/u", $name)) {
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$this->parseError("Unexpected character at the begining of attribute name: %s", $name);
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$isValidAttribute = FALSE;
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}
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// 8.1.2.3
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$this->scanner->whitespace();
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$val = $this->attributeValue();
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if($isValidAttribute) {
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$attributes[$name] = $val;
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}
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return TRUE;
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}
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/**
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* Consume an attribute value.
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* 8.2.4.37 and after.
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*/
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protected function attributeValue() {
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if ($this->scanner->current() != '=') {
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return NULL;
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}
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$this->scanner->next();
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// 8.1.2.3
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$this->scanner->whitespace();
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$tok = $this->scanner->current();
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switch ($tok) {
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case "\n":
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case "\f":
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case " ":
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case "\t":
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// Whitespace here indicates an empty value.
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return NULL;
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case '"':
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case "'":
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$this->scanner->next();
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return $this->quotedAttributeValue($tok);
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case '>':
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// case '/': // 8.2.4.37 seems to allow foo=/ as a valid attr.
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$this->parseError("Expected attribute value, got tag end.");
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return NULL;
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case '=':
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case '`':
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$this->parseError("Expecting quotes, got %s.", $tok);
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return $this->unquotedAttributeValue();
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default:
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return $this->unquotedAttributeValue();
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}
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}
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/**
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* Get an attribute value string.
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*
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* @param string $quote
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* IMPORTANT: This is a series of chars! Any one of which will be considered
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* termination of an attribute's value. E.g. "\"'" will stop at either
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* ' or ".
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* @return string
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* The attribute value.
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*/
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protected function quotedAttributeValue($quote) {
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$stoplist = "\f" . $quote;
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$val = '';
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$tok = $this->scanner->current();
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while (strspn($tok, $stoplist) == 0 && $tok !== FALSE) {
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if ($tok == '&') {
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$val .= $this->decodeCharacterReference(TRUE);
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$tok = $this->scanner->current();
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}
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else {
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$val .= $tok;
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$tok = $this->scanner->next();
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}
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}
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$this->scanner->next();
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return $val;
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}
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protected function unquotedAttributeValue() {
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$stoplist = "\t\n\f >";
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$val = '';
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$tok = $this->scanner->current();
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while (strspn($tok, $stoplist) == 0 && $tok !== FALSE) {
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if ($tok == '&') {
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$val .= $this->decodeCharacterReference(TRUE);
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$tok = $this->scanner->current();
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}
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else {
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if(strspn($tok, "\"'<=`") > 0) {
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$this->parseError("Unexpected chars in unquoted attribute value %s", $tok);
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}
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$val .= $tok;
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$tok = $this->scanner->next();
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}
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}
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return $val;
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}
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/**
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* Consume malformed markup as if it were a comment.
|
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* 8.2.4.44
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*
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* The spec requires that the ENTIRE tag-like thing be enclosed inside of
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* the comment. So this will generate comments like:
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*
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* <!--</+foo>-->
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*
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* @param string $leading
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* Prepend any leading characters. This essentially
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* negates the need to backtrack, but it's sort of
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* a hack.
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*/
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protected function bogusComment($leading = '') {
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// TODO: This can be done more efficiently when the
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// scanner exposes a readUntil() method.
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$comment = $leading;
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$tok = $this->scanner->current();
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do {
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$comment .= $tok;
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$tok = $this->scanner->next();
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} while ($tok !== FALSE && $tok != '>');
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$this->flushBuffer();
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$this->events->comment($comment . $tok);
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$this->scanner->next();
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* Read a comment.
|
|
*
|
|
* Expects the first tok to be inside of the comment.
|
|
*/
|
|
protected function comment() {
|
|
$tok = $this->scanner->current();
|
|
$comment = '';
|
|
|
|
// <!-->. Emit an empty comment because 8.2.4.46 says to.
|
|
if ($tok == '>') {
|
|
// Parse error. Emit the comment token.
|
|
$this->parseError("Expected comment data, got '>'");
|
|
$this->events->comment('');
|
|
$this->scanner->next();
|
|
return TRUE;
|
|
}
|
|
|
|
// Replace NULL with the replacement char.
|
|
if ($tok == "\0") {
|
|
$tok = UTF8Utils::FFFD;
|
|
}
|
|
while (!$this->isCommentEnd()) {
|
|
$comment .= $tok;
|
|
$tok = $this->scanner->next();
|
|
}
|
|
|
|
$this->events->comment($comment);
|
|
$this->scanner->next();
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* Check if the scanner has reached the end of a comment.
|
|
*/
|
|
protected function isCommentEnd() {
|
|
// EOF
|
|
if($this->scanner->current() === FALSE) {
|
|
// Hit the end.
|
|
$this->parseError("Unexpected EOF in a comment.");
|
|
return TRUE;
|
|
}
|
|
|
|
// If it doesn't start with -, not the end.
|
|
if($this->scanner->current() != '-') {
|
|
return FALSE;
|
|
}
|
|
|
|
|
|
// Advance one, and test for '->'
|
|
if ($this->scanner->next() == '-'
|
|
&& $this->scanner->peek() == '>') {
|
|
$this->scanner->next(); // Consume the last '>'
|
|
return TRUE;
|
|
}
|
|
// Unread '-';
|
|
$this->scanner->unconsume(1);
|
|
return FALSE;
|
|
}
|
|
|
|
/**
|
|
* Parse a DOCTYPE.
|
|
*
|
|
* Parse a DOCTYPE declaration. This method has strong bearing on whether or
|
|
* not Quirksmode is enabled on the event handler.
|
|
*
|
|
* @todo This method is a little long. Should probably refactor.
|
|
*/
|
|
protected function doctype() {
|
|
if (strcasecmp($this->scanner->current(), 'D')) {
|
|
return FALSE;
|
|
}
|
|
// Check that string is DOCTYPE.
|
|
$chars = $this->scanner->charsWhile("DOCTYPEdoctype");
|
|
if (strcasecmp($chars, 'DOCTYPE')) {
|
|
$this->parseError('Expected DOCTYPE, got %s', $chars);
|
|
return $this->bogusComment('<!' . $chars);
|
|
}
|
|
|
|
$this->scanner->whitespace();
|
|
$tok = $this->scanner->current();
|
|
|
|
// EOF: die.
|
|
if ($tok === FALSE) {
|
|
$this->events->doctype('html5',EventHandler::DOCTYPE_NONE,'', TRUE);
|
|
return $this->eof();
|
|
}
|
|
|
|
$doctypeName = '';
|
|
|
|
// NULL char: convert.
|
|
if ($tok === "\0") {
|
|
$this->parseError("Unexpected NULL character in DOCTYPE.");
|
|
$doctypeName .= UTF8::FFFD;
|
|
$tok = $this->scanner->next();
|
|
}
|
|
|
|
$stop = " \n\f>";
|
|
$doctypeName = $this->scanner->charsUntil($stop);
|
|
// Lowercase ASCII, replace \0 with FFFD
|
|
$doctypeName = strtolower(strtr($doctypeName, "\0", UTF8Utils::FFFD));
|
|
|
|
$tok = $this->scanner->current();
|
|
|
|
// If FALSE, emit a parse error, DOCTYPE, and return.
|
|
if ($tok === FALSE) {
|
|
$this->parseError('Unexpected EOF in DOCTYPE declaration.');
|
|
$this->events->doctype($doctypeName, EventHandler::DOCTYPE_NONE, NULL, TRUE);
|
|
return TRUE;
|
|
}
|
|
|
|
// Short DOCTYPE, like <!DOCTYPE html>
|
|
if ($tok == '>') {
|
|
// DOCTYPE without a name.
|
|
if (strlen($doctypeName) == 0) {
|
|
$this->parseError("Expected a DOCTYPE name. Got nothing.");
|
|
$this->events->doctype($doctypeName, 0, NULL, TRUE);
|
|
$this->scanner->next();
|
|
return TRUE;
|
|
}
|
|
$this->events->doctype($doctypeName);
|
|
$this->scanner->next();
|
|
return TRUE;
|
|
}
|
|
$this->scanner->whitespace();
|
|
|
|
$pub = strtoupper($this->scanner->getAsciiAlpha());
|
|
$white = strlen($this->scanner->whitespace());
|
|
$tok = $this->scanner->current();
|
|
|
|
// Get ID, and flag it as pub or system.
|
|
if (($pub == 'PUBLIC' || $pub == 'SYSTEM') && $white > 0) {
|
|
// Get the sys ID.
|
|
$type = $pub == 'PUBLIC' ? EventHandler::DOCTYPE_PUBLIC : EventHandler::DOCTYPE_SYSTEM;
|
|
$id = $this->quotedString("\0>");
|
|
if ($id === FALSE) {
|
|
$this->events->doctype($doctypeName, $type, $pub, FALSE);
|
|
return FALSE;
|
|
}
|
|
|
|
// Premature EOF.
|
|
if ($this->scanner->current() === FALSE) {
|
|
$this->parseError("Unexpected EOF in DOCTYPE");
|
|
$this->events->doctype($doctypeName, $type, $id, TRUE);
|
|
return TRUE;
|
|
}
|
|
|
|
// Well-formed complete DOCTYPE.
|
|
$this->scanner->whitespace();
|
|
if ($this->scanner->current() == '>') {
|
|
$this->events->doctype($doctypeName, $type, $id, FALSE);
|
|
$this->scanner->next();
|
|
return TRUE;
|
|
}
|
|
|
|
// If we get here, we have <!DOCTYPE foo PUBLIC "bar" SOME_JUNK
|
|
// Throw away the junk, parse error, quirks mode, return TRUE.
|
|
$this->scanner->charsUntil(">");
|
|
$this->parseError("Malformed DOCTYPE.");
|
|
$this->events->doctype($doctypeName, $type, $id, TRUE);
|
|
$this->scanner->next();
|
|
return TRUE;
|
|
}
|
|
|
|
// Else it's a bogus DOCTYPE.
|
|
// Consume to > and trash.
|
|
$this->scanner->charsUntil('>');
|
|
|
|
$this->parseError("Expected PUBLIC or SYSTEM. Got %s.", $pub);
|
|
$this->events->doctype($doctypeName, 0, NULL, TRUE);
|
|
$this->scanner->next();
|
|
return TRUE;
|
|
|
|
}
|
|
|
|
/**
|
|
* Utility for reading a quoted string.
|
|
*
|
|
* @param string $stopchars
|
|
* Characters (in addition to a close-quote) that should stop the string.
|
|
* E.g. sometimes '>' is higher precedence than '"' or "'".
|
|
* @return mixed
|
|
* String if one is found (quotations omitted)
|
|
*/
|
|
protected function quotedString($stopchars) {
|
|
$tok = $this->scanner->current();
|
|
if ($tok == '"' || $tok == "'") {
|
|
$this->scanner->next();
|
|
$ret = $this->scanner->charsUntil($tok . $stopchars);
|
|
if ($this->scanner->current() == $tok) {
|
|
$this->scanner->next();
|
|
}
|
|
else {
|
|
// Parse error because no close quote.
|
|
$this->parseError("Expected %s, got %s", $tok, $this->scanner->current());
|
|
}
|
|
return $ret;
|
|
}
|
|
return FALSE;
|
|
}
|
|
|
|
|
|
/**
|
|
* Handle a CDATA section.
|
|
*/
|
|
protected function cdataSection() {
|
|
if ($this->scanner->current() != '[') {
|
|
return FALSE;
|
|
}
|
|
$cdata = '';
|
|
$this->scanner->next();
|
|
|
|
$chars = $this->scanner->charsWhile('CDAT');
|
|
if ($chars != 'CDATA' || $this->scanner->current() != '[') {
|
|
$this->parseError('Expected [CDATA[, got %s', $chars);
|
|
return $this->bogusComment('<![' . $chars);
|
|
}
|
|
|
|
$tok = $this->scanner->next();
|
|
do {
|
|
if ($tok === FALSE) {
|
|
$this->parseError('Unexpected EOF inside CDATA.');
|
|
$this->bogusComment('<![CDATA[' . $cdata);
|
|
return TRUE;
|
|
}
|
|
$cdata .= $tok;
|
|
$tok = $this->scanner->next();
|
|
}
|
|
while (!$this->sequenceMatches(']]>'));
|
|
|
|
// Consume ]]>
|
|
$this->scanner->consume(3);
|
|
|
|
$this->events->cdata($cdata);
|
|
return TRUE;
|
|
|
|
}
|
|
|
|
// ================================================================
|
|
// Non-HTML5
|
|
// ================================================================
|
|
/**
|
|
* Handle a processing instruction.
|
|
*
|
|
* XML processing instructions are supposed to be ignored in HTML5,
|
|
* treated as "bogus comments". However, since we're not a user
|
|
* agent, we allow them. We consume until ?> and then issue a
|
|
* EventListener::processingInstruction() event.
|
|
*/
|
|
protected function processingInstruction() {
|
|
if ($this->scanner->current() != '?') {
|
|
return FALSE;
|
|
}
|
|
|
|
$tok = $this->scanner->next();
|
|
$procName = $this->scanner->getAsciiAlpha();
|
|
$white = strlen($this->scanner->whitespace());
|
|
|
|
// If not a PI, send to bogusComment.
|
|
if (strlen($procName) == 0 || $white == 0 || $this->scanner->current() == FALSE) {
|
|
$this->parseError("Expected processing instruction name, got $tok");
|
|
$this->bogusComment('<?' . $tok . $procName);
|
|
return TRUE;
|
|
}
|
|
|
|
$data = '';
|
|
// As long as it's not the case that the next two chars are ? and >.
|
|
while (!($this->scanner->current() == '?' && $this->scanner->peek() == '>')) {
|
|
$data .= $this->scanner->current();
|
|
|
|
$tok = $this->scanner->next();
|
|
if ($tok === FALSE) {
|
|
$this->parseError("Unexpected EOF in processing instruction.");
|
|
$this->events->processingInstruction($procName, $data);
|
|
return TRUE;
|
|
}
|
|
|
|
}
|
|
|
|
$this->scanner->next(); // >
|
|
$this->scanner->next(); // Next token.
|
|
$this->events->processingInstruction($procName, $data);
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
// ================================================================
|
|
// UTILITY FUNCTIONS
|
|
// ================================================================
|
|
|
|
/**
|
|
* Read from the input stream until we get to the desired sequene
|
|
* or hit the end of the input stream.
|
|
*/
|
|
protected function readUntilSequence($sequence) {
|
|
$buffer = '';
|
|
|
|
// Optimization for reading larger blocks faster.
|
|
$first = substr($sequence, 0, 1);
|
|
while ($this->scanner->current() !== FALSE) {
|
|
$buffer .= $this->scanner->charsUntil($first);
|
|
|
|
// Stop as soon as we hit the stopping condition.
|
|
if ($this->sequenceMatches($sequence) || $this->sequenceMatches(strtoupper($sequence))) {
|
|
return $buffer;
|
|
}
|
|
$buffer .= $this->scanner->current();
|
|
$this->scanner->next();
|
|
}
|
|
|
|
// If we get here, we hit the EOF.
|
|
$this->parseError("Unexpected EOF during text read.");
|
|
return $buffer;
|
|
}
|
|
|
|
/**
|
|
* Check if upcomming chars match the given sequence.
|
|
*
|
|
* This will read the stream for the $sequence. If it's
|
|
* found, this will return TRUE. If not, return FALSE.
|
|
* Since this unconsumes any chars it reads, the caller
|
|
* will still need to read the next sequence, even if
|
|
* this returns TRUE.
|
|
*
|
|
* Example: $this->sequenceMatches('</script>') will
|
|
* see if the input stream is at the start of a
|
|
* '</script>' string.
|
|
*/
|
|
protected function sequenceMatches($sequence) {
|
|
$len = strlen($sequence);
|
|
$buffer = '';
|
|
for ($i = 0; $i < $len; ++$i) {
|
|
$buffer .= $this->scanner->current();
|
|
|
|
// EOF. Rewind and let the caller handle it.
|
|
if ($this->scanner->current() === FALSE) {
|
|
$this->scanner->unconsume($i);
|
|
return FALSE;
|
|
}
|
|
$this->scanner->next();
|
|
}
|
|
|
|
$this->scanner->unconsume($len);
|
|
return $buffer == $sequence;
|
|
|
|
}
|
|
|
|
/**
|
|
* Send a TEXT event with the contents of the text buffer.
|
|
*
|
|
* This emits an EventHandler::text() event with the current contents of the
|
|
* temporary text buffer. (The buffer is used to group as much PCDATA
|
|
* as we can instead of emitting lots and lots of TEXT events.)
|
|
*/
|
|
protected function flushBuffer() {
|
|
if (empty($this->text)) {
|
|
return;
|
|
}
|
|
$this->events->text($this->text);
|
|
$this->text = '';
|
|
}
|
|
|
|
/**
|
|
* Add text to the temporary buffer.
|
|
*
|
|
* @see flushBuffer()
|
|
*/
|
|
protected function buffer($str) {
|
|
$this->text .= $str;
|
|
}
|
|
|
|
/**
|
|
* Emit a parse error.
|
|
*
|
|
* A parse error always returns FALSE because it never consumes any
|
|
* characters.
|
|
*/
|
|
protected function parseError($msg) {
|
|
$args = func_get_args();
|
|
|
|
if (count($args) > 1) {
|
|
array_shift($args);
|
|
$msg = vsprintf($msg, $args);
|
|
}
|
|
|
|
$line = $this->scanner->currentLine();
|
|
$col = $this->scanner->columnOffset();
|
|
$this->events->parseError($msg, $line, $col);
|
|
return FALSE;
|
|
}
|
|
|
|
/**
|
|
* Decode a character reference and return the string.
|
|
*
|
|
* Returns FALSE if the entity could not be found. If $inAttribute is set
|
|
* to TRUE, a bare & will be returned as-is.
|
|
*
|
|
* @param boolean $inAttribute
|
|
* Set to TRUE if the text is inside of an attribute value.
|
|
* FALSE otherwise.
|
|
*/
|
|
protected function decodeCharacterReference($inAttribute = FALSE) {
|
|
|
|
// If it fails this, it's definitely not an entity.
|
|
if ($this->scanner->current() != '&') {
|
|
return FALSE;
|
|
}
|
|
|
|
// Next char after &.
|
|
$tok = $this->scanner->next();
|
|
$entity = '';
|
|
$start = $this->scanner->position();
|
|
|
|
if ($tok == FALSE) {
|
|
return '&';
|
|
}
|
|
|
|
// These indicate not an entity. We return just
|
|
// the &.
|
|
if (strspn($tok, static::WHITE . "&<") == 1) {
|
|
//$this->scanner->next();
|
|
return '&';
|
|
}
|
|
|
|
// Numeric entity
|
|
if ($tok == '#') {
|
|
$tok = $this->scanner->next();
|
|
|
|
// Hexidecimal encoding.
|
|
// X[0-9a-fA-F]+;
|
|
// x[0-9a-fA-F]+;
|
|
if ($tok == 'x' || $tok == 'X') {
|
|
$tok = $this->scanner->next(); // Consume x
|
|
|
|
// Convert from hex code to char.
|
|
$hex = $this->scanner->getHex();
|
|
if (empty($hex)) {
|
|
$this->parseError("Expected &#xHEX;, got &#x%s", $tok);
|
|
// We unconsume because we don't know what parser rules might
|
|
// be in effect for the remaining chars. For example. '&#>'
|
|
// might result in a specific parsing rule inside of tag
|
|
// contexts, while not inside of pcdata context.
|
|
$this->scanner->unconsume(2);
|
|
return '&';
|
|
}
|
|
$entity = CharacterReference::lookupHex($hex);
|
|
}
|
|
// Decimal encoding.
|
|
// [0-9]+;
|
|
else {
|
|
// Convert from decimal to char.
|
|
$numeric = $this->scanner->getNumeric();
|
|
if ($numeric === FALSE) {
|
|
$this->parseError("Expected &#DIGITS;, got &#%s", $tok);
|
|
$this->scanner->unconsume(2);
|
|
return '&';
|
|
}
|
|
$entity = CharacterReference::lookupDecimal($numeric);
|
|
}
|
|
}
|
|
// String entity.
|
|
else {
|
|
// Attempt to consume a string up to a ';'.
|
|
// [a-zA-Z0-9]+;
|
|
$cname = $this->scanner->getAsciiAlpha();
|
|
$entity = CharacterReference::lookupName($cname);
|
|
if ($entity == NULL) {
|
|
$this->parseError("No match in entity table for '%s'", $entity);
|
|
}
|
|
}
|
|
|
|
// The scanner has advanced the cursor for us.
|
|
$tok = $this->scanner->current();
|
|
|
|
// We have an entity. We're done here.
|
|
if ($tok == ';') {
|
|
$this->scanner->next();
|
|
return $entity;
|
|
}
|
|
|
|
// If in an attribute, then failing to match ; means unconsume the
|
|
// entire string. Otherwise, failure to match is an error.
|
|
if ($inAttribute) {
|
|
$this->scanner->unconsume($this->scanner->position() - $start);
|
|
return '&';
|
|
}
|
|
|
|
$this->parseError("Expected &ENTITY;, got &ENTITY%s (no trailing ;) ", $tok);
|
|
return '&' . $entity;
|
|
|
|
}
|
|
|
|
}
|