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|
<?php
namespace HTML5\Parser;
/**
* The HTML5 tokenizer.
*
* The tokenizer's role is reading data from the scanner and gathering it into
* semantic units. From the tokenizer, data is emitted to an event handler,
* which may (for example) create a DOM tree.
*
* The HTML5 specification has a detailed explanation of tokenizing HTML5. We
* follow that specification to the maximum extent that we can. If you find
* a discrepancy that is not documented, please file a bug and/or submit a
* patch.
*
* This tokenizer is implemented as a recursive descent parser.
*
* Within the API documentation, you may see references to the specific section
* of the HTML5 spec that the code attempts to reproduce. Example: 8.2.4.1.
* This refers to section 8.2.4.1 of the HTML5 CR specification.
*
* @see http://www.w3.org/TR/2012/CR-html5-20121217/
*/
class Tokenizer {
protected $scanner;
protected $events;
protected $tok;
/**
* Buffer for text.
*/
protected $text = '';
// When this goes to false, the parser stops.
protected $carryOn = TRUE;
/**
* Create a new tokenizer.
*
* Typically, parsing a document involves creating a new tokenizer, giving
* it a scanner (input) and an event handler (output), and then calling
* the Tokenizer::parse() method.`
*
* @param \HTML5\Parser\Scanner $scanner
* A scanner initialized with an input stream.
* @param \HTML5\Parser\EventHandler $eventHandler
* An event handler, initialized and ready to receive
* events.
*/
public function __construct($scanner, $eventHandler) {
$this->scanner = $scanner;
$this->events = $eventHandler;
}
/**
* Main entry point.
*/
public function parse() {
$p = 0;
do {
$p = $this->scanner->position();
$this->consumeData();
// FIXME: Add infinite loop protection.
}
while ($this->carryOn);
}
/**
* Consume a character and make a move.
* HTML5 8.2.4.1
*/
protected function consumeData() {
// Character Ref
$this->characterReference() ||
$this->tagOpen() ||
$this->eof() ||
$this->characterData();
return $this->carryOn;
}
/**
* This buffers the current token as character data.
*/
protected function characterData() {
$tok = $this->scanner->current();
// This should never happen...
if ($tok === FALSE) {
return FALSE;
}
// Null
if ($tok === "\00") {
$this->parseError("Received NULL character.");
}
// fprintf(STDOUT, "Writing '%s'", $tok);
$this->buffer($tok);
$this->scanner->next();
return TRUE;
}
protected function eof() {
if ($this->scanner->current() === FALSE) {
//fprintf(STDOUT, "EOF");
$this->flushBuffer();
$this->events->eof();
$this->carryOn = FALSE;
return TRUE;
}
return FALSE;
}
/**
* Handle character references (aka entities).
*
* HTML5 8.2.4.2
*
* @param boolean $inAttribute
* Set to TRUE if the text is inside of an attribute value.
* FALSE otherwise.
*/
protected function characterReference($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 = $this->scanner->position();
// Whitespace: Ignore
switch ($tok) {
case NULL:
case "\t":
case "\n":
case "\f":
case ' ':
case '&':
case '<':
// Don't consume; just return. Spec says return nothing, but I
// think we have to append '&' to the string.
$this->buffer('&');
return FALSE;
case '#':
// Consume and read a number
$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
$hex = $this->scanner->getHex();
if (empty($hex)) {
//throw new ParseError("Expected &#xHEX;, got &#x" . $tok);
$this->parseError("Expected &#xHEX;, got &#x%s", $tok);
return FALSE;
}
$entity = CharacterReference::lookupHex($hex);
}
// Decimal encoding.
// [0-9]+;
else {
$numeric = $this->scanner->getNumeric();
if (empty($numeric)) {
//throw ParseError("Expected &#DIGITS;, got $#" . $tok);
$this->parseError("Expected &#DIGITS;, got $#%s", $tok);
return FALSE;
}
$entity = CharacterReference::lookupDecimal($numeric);
}
break;
default:
// 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 == ';') {
$this->buffer($entity);
$this->scanner->next();
return TRUE;
}
// If in an attribute, then failing to match ; means unconsume the
// entire string. Otherwise, failure to match is an error.
if ($inAttribute) {
$this->scanner->unconsume($this->scanner->position() - $start);
$this->buffer('&');
return FALSE;
}
//throw new ParseError("Expected &ENTITY;, got &ENTITY (no trailing ;) " . $tok);
$this->parseError("Expected &ENTITY;, got &ENTITY%s (no trailing ;) ", $tok);
}
/**
* 8.2.4.8
*/
protected function tagOpen() {
if ($this->scanner->current() != '<') {
return FALSE;
}
// Any buffered text data can go out now.
$this->flushBuffer();
$this->scanner->next();
return $this->markupDeclaration() ||
$this->endTag() ||
$this->processingInstruction() ||
$this->tagName() ||
// This always returns false.
$this->parseError("Illegal tag opening") ||
$this->characterData();
}
protected function markupDeclaration() {
if ($this->scanner->current() != '!') {
return FALSE;
}
$tok = $this->scanner->next();
// Comment:
if ($tok == '-' && $this->scanner->peek() == '-') {
$this->scanner->next(); // Consume the other '-'
$this->scanner->next(); // Next char.
return $this->comment();
}
// Doctype
elseif($tok == 'D') {
return $this->doctype('');
}
// CDATA section
elseif($tok == '[') {
return $this->cdataSection();
}
// FINISH
$this->parseError("Expected <!--, <![CDATA[, or <!DOCTYPE. Got <!%s", $tok);
$this->bogusComment('<!');
return TRUE;
}
/**
* Consume an end tag.
* 8.2.4.9
*/
protected function endTag() {
if ($this->scanner->current() != '/') {
return FALSE;
}
$tok = $this->scanner->next();
// a-zA-Z -> tagname
// > -> parse error
// EOF -> parse error
// -> parse error
if (!ctype_alpha($tok)) {
$this->parseError("Expected tag name, got '%s'", $tok);
if ($tok == "\0" || $tok === FALSE) {
return FALSE;
}
return $this->bogusComment('</');
}
$name = $this->scanner->charsUntil("\n\f \t>");
// Trash whitespace.
$this->scanner->whitespace();
if ($this->scanner->current() != '>') {
$this->parseError("Expected >, got '%s'", $this->scanner->current());
// We just trash stuff until we get to the next tag close.
$this->scanner->charsUntil('>');
}
$this->events->endTag($name);
$this->scanner->next();
return TRUE;
}
/**
* Consume a tag name and body.
* 8.2.4.10
*/
protected function tagName() {
$tok = $this->scanner->current();
if (!ctype_alpha($tok)) {
return FALSE;
}
// We know this is at least one char.
$name = strtolower($this->scanner->charsUntil("/> \n\f\t"));
$attributes = array();
$selfClose = FALSE;
do {
$this->attributes($attributes);
$this->scanner->whitespace();
}
while (!$this->isTagEnd($selfClose));
$this->events->startTag($name, $attributes, $selfClose);
// Should we do this? What does this buy that selfClose doesn't?
if ($selfClose) {
$this->events->endTag($name);
}
$this->scanner->next();
return TRUE;
}
protected function isTagEnd(&$selfClose) {
$tok = $this->scanner->current();
if ($tok == '/') {
$this->scanner->next();
$this->scanner->whitespace();
if ($this->scanner->current() == '>') {
$selfClose = TRUE;
$this->scanner->next();
return TRUE;
}
if ($this->scanner->current() === FALSE) {
$this->parseError("Unexpected EOF inside of tag.");
return TRUE;
}
// Basically, we skip the / token and go on.
// See 8.2.4.43.
$this->parseError("Unexpected '%s' inside of a tag.", $this->scanner->current());
return FALSE;
}
if ($this->scanner->current() == '>') {
return TRUE;
}
if ($this->scanner->current() === FALSE) {
$this->parseError("Unexpected EOF inside of tag.");
return TRUE;
}
return FALSE;
}
/**
* Parse attributes from inside of a tag.
*/
protected function attributes(&$attributes) {
$tok = $this->scanner->current();
if ($tok == '/' || $tok == '>') {
return array();
}
return array();
}
protected function attribute() {
$name = $this->scanner->charsUntil("/>= '\"\n\f\t");
$val = $this->attributeValue();
return array($name, $value);
}
protected function attributeValue() {
return '';
}
/**
* Consume malformed markup as if it were a comment.
* 8.2.4.44
*
* The spec requires that the ENTIRE tag-like thing be enclosed inside of
* the comment. So this will generate comments like:
*
* <!--</+foo>-->
*
* @param string $leading
* Prepend any leading characters. This essentially
* negates the need to backtrack, but it's sort of
* a hack.
*/
protected function bogusComment($leading = '') {
// TODO: This can be done more efficiently when the
// scanner exposes a readUntil() method.
$comment = $leading;
$tok = $this->scanner->current();
do {
$comment .= $tok;
$tok = $this->scanner->next();
} while ($tok !== FALSE && $tok != '>');
$this->flushBuffer();
$this->events->comment($comment . $tok);
$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);
$this->scanner->next();
return TRUE;
}
protected function isCommentEnd() {
// EOF
if($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 '-';
$this->scanner->unconsume(1);
return FALSE;
}
/**
* Parse a DOCTYPE.
*
* Parse a DOCTYPE declaration. This method has strong bearing on whether or
* not Quirksmode is enabled on the event handler.
*
* @todo This method is a little long. Should probably refactor.
*/
protected function doctype() {
if ($this->scanner->current() != 'D') {
return FALSE;
}
// Check that string is DOCTYPE
$chars = $this->scanner->charsWhile("DOCTYPE");
if ($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 == '"' || "'") {
$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->isCdataClose());
$this->scanner->next(); // consume >
$this->scanner->next(); // Next char after >
$this->events->cdata($cdata);
return TRUE;
}
/**
* Check whether the parser has reached the end of a CDATA section.
*/
protected function isCdataClose() {
$tok = $this->scanner->current();
if ($tok != ']') {
return FALSE;
}
$tok = $this->scanner->next();
if ($tok == ']' && $this->scanner->peek() == '>') {
return TRUE;
}
// Unconsume one char and return.
$this->scanner->unconsume();
return FALSE;
}
protected function rcdata() {
// Ampersand
// <
// Null
// EOF
// Character
}
protected function rawtext() {
// < is a literal
// NULL is an error
// EOF
// Character data
}
protected function scriptData() {
// < is a literal
// NULL is an error
// EOF
// Character data
}
/**
* 8.2.4.7
*/
protected function plaintext() {
// NULL -> parse error
// EOF -> eof
// -> Character data
}
/**
* 8.2.4.11
*/
protected function rcdataLessThan() {
// / -> empty the tmp buffer and go to end-tag
// ->rcdata
}
/**
* 8.2.4.12
*/
protected function rcdataEndTag() {
// A-Za-z: append to tagname
// -> rcdata state
}
/**
* 8.2.4.13
*/
protected function rcdataEndTagName() {
// tab, lf, ff, space -> before attribute or treat as anything
// / -> self-closing tag
// > -> end tag, back to data
// A-Za-z -> append to tagname
// -> rcdata state
}
/**
* 8.2.4.14
*/
protected function rawtextLessThan() {
// / -> rawtext endtag state
// -> rawtext
}
/**
* 8.2.4.15
*/
protected function rawtextEndTagOpen() {
// A-Za-z -> rawtext
// ->rawtext
}
protected function rawtextEndTagName() {
// tab, lf, ff, space -> before attr name
//
}
protected function scriptLessThan(){
}
protected function scriptEndTagOpen() {
}
protected function scriptEndTagName() {
}
protected function scriptEscapeStart() {
}
protected function scriptEscapeStartDash() {
}
protected function scriptEscaped() {
}
protected function scriptEscapedDash() {
}
protected function scriptEscapedDashDash() {
}
protected function scriptEscapedLessThan() {
}
protected function scriptEscapedEndTagOpen() {
}
protected function scriptEscapedEndTagName() {
}
protected function scriptDoubleEscapeStart() {
}
protected function scriptDoubleEscaped() {
}
protected function scriptDoubleEscapedDash() {
}
protected function scriptDoubleEscapedDashDash() {
}
protected function scriptDoubleEscapedLessThan() {
}
protected function scriptDoubleEscapeEnd() {
}
protected function beforeAttributeName() {
}
protected function attributeName() {
}
protected function afterAttributeName() {
}
protected function beforeAttributeValue() {
}
protected function attributeValueDoubleQuote() {
}
protected function attributeValueSingleQuote() {
}
protected function attributeValueUnquoted() {
}
protected function characterReferenceInAttributeValue() {
}
protected function afterAttributeValueQuoted() {
}
protected function selfCloseingStartTag() {
}
protected function beforeDoctype() {
}
protected function doctypeName() {
}
protected function afterDoctypeName() {
}
protected function doctypePublicKeyword() {
}
protected function beforeDoctypePublicId() {
}
protected function doctypePublicIdDoubleQuoted() {
}
protected function doctypePublicIdSingleQuoted() {
}
protected function afterDoctypePublicId() {
}
protected function betweenDoctypePublicAndSystem() {
}
protected function afterDoctypeSystemKeyword() {
}
protected function beforeDoctypeSystemIdentifier() {
}
protected function doctypeSystemIdDoubleQuoted() {
}
protected function doctypeSystemIdSingleQuoted() {
}
protected function afterDoctypeSystemId() {
}
protected function bogusDoctype() {
}
// ================================================================
// 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;
}
$data = '';
while ($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, $data);
return TRUE;
}
// ================================================================
// UTILITY FUNCTIONS
// ================================================================
/**
* Send a TEXT event with the contents of the text buffer.
*
* This emits an EventHandler::text() event with the current contents of the
* temporary text buffer. (The buffer is used to group as much PCDATA
* as we can instead of emitting lots and lots of TEXT events.)
*/
protected function flushBuffer() {
if (empty($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;
}
}
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