diff options
Diffstat (limited to 'src/HTML5/Parser')
-rw-r--r-- | src/HTML5/Parser/Tokenizer.php | 173 |
1 files changed, 136 insertions, 37 deletions
diff --git a/src/HTML5/Parser/Tokenizer.php b/src/HTML5/Parser/Tokenizer.php index 7ea714e..58b77a8 100644 --- a/src/HTML5/Parser/Tokenizer.php +++ b/src/HTML5/Parser/Tokenizer.php @@ -34,6 +34,8 @@ class Tokenizer { // When this goes to false, the parser stops. protected $carryOn = TRUE; + const WHITE="\t\n\f "; + /** * Create a new tokenizer. * @@ -114,13 +116,31 @@ class Tokenizer { /** * Handle character references (aka entities). * + * This version is specific to PCDATA, as it buffers data into the + * text buffer. For a generic version, see decodeCharacterReference(). + * * HTML5 8.2.4.2 + */ + protected function characterReference() { + $ref = $this->decodeCharacterReference(); + if ($ref !== FALSE) { + $this->buffer($ref); + return TRUE; + } + 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 $inAttribute * Set to TRUE if the text is inside of an attribute value. * FALSE otherwise. */ - protected function characterReference($inAttribute = FALSE) { + protected function decodeCharacterReference($inAttribute = FALSE) { // If it fails this, it's definitely not an entity. if ($this->scanner->current() != '&') { @@ -132,21 +152,19 @@ class Tokenizer { $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. - $this->buffer('&'); - return FALSE; - case '#': - // Consume and read a number + if ($tok == FALSE) { + return '&'; + } + + // These indicate not an entity. We return just + // the &. + if (strspn($tok, self::WHITE . "&<") == 1) { + $this->scanner->next(); + return '&'; + } + + // Numeric entity + if ($tok == '#') { $tok = $this->scanner->next(); // Hexidecimal encoding. @@ -154,27 +172,35 @@ class Tokenizer { // x[0-9a-fA-F]+; if ($tok == 'x' || $tok == 'X') { $tok = $this->scanner->next(); // Consume x + + // Convert from hex code to char. $hex = $this->scanner->getHex(); if (empty($hex)) { - //throw new ParseError("Expected &#xHEX;, got &#x" . $tok); $this->parseError("Expected &#xHEX;, got &#x%s", $tok); - return FALSE; + // 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 = $this->scanner->getNumeric(); - if (empty($numeric)) { - //throw ParseError("Expected &#DIGITS;, got $#" . $tok); - $this->parseError("Expected &#DIGITS;, got $#%s", $tok); - return FALSE; + if ($numeric === FALSE) { + $this->parseError("Expected &#DIGITS;, got &#%s", $tok); + $this->scanner->unconsume(2); + return '&'; } $entity = CharacterReference::lookupDecimal($numeric); } - break; - default: + } + // String entity. + else { // Attempt to consume a string up to a ';'. // [a-zA-Z0-9]+; $cname = $this->scanner->getAsciiAlpha(); @@ -182,28 +208,26 @@ class Tokenizer { if ($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; + 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); - $this->buffer('&'); - return FALSE; + return '&'; } - //throw new ParseError("Expected &ENTITY;, got &ENTITY (no trailing ;) " . $tok); $this->parseError("Expected &ENTITY;, got &ENTITY%s (no trailing ;) ", $tok); + return '&' . $entity; } @@ -311,8 +335,8 @@ class Tokenizer { $selfClose = FALSE; do { - $this->attributes($attributes); $this->scanner->whitespace(); + $this->attributes($attributes); } while (!$this->isTagEnd($selfClose)); @@ -364,21 +388,96 @@ class Tokenizer { */ protected function attributes(&$attributes) { $tok = $this->scanner->current(); - if ($tok == '/' || $tok == '>') { - return array(); + if ($tok == '/' || $tok == '>' || $tok === FALSE) { + return FALSE; } - return array(); + list($k, $v) = $this->attribute(); + $attributes[$k] = $v; } protected function attribute() { - $name = $this->scanner->charsUntil("/>= '\"\n\f\t"); + $name = $this->scanner->charsUntil("/>=\n\f\t "); + + if (strlen($name) == 0) { + $this->parseError("Expected an attribute name, got %s.", $this->scanner->current()); + // Really, only '=' can be the char here. Everything else gets absorbed + // under one rule or another. + $name = $this->scanner->current(); + $this->scanner->next(); + } + if (preg_match('/\'\"/', $name)) { + $this->parseError("Unexpected characters in attribute name"); + } + $this->scanner->whitespace(); + $val = $this->attributeValue(); - return array($name, $value); + return array($name, $val); } + /** + * Consume an attribute value. + * 8.2.4.37 and after. + */ protected function attributeValue() { - return ''; + if ($this->scanner->current() != '=') { + return NULL; + } + $this->scanner->next(); + // Whitespace is significant + //$this->scanner->whitespace(); + + $tok = $this->scanner->current(); + switch ($tok) { + case "\n": + case "\f": + case " ": + case "\t": + // Whitespace here indicates an empty value. + return NULL; + case '"': + case "'": + return $this->quotedAttributeValue($tok); + case '>': + // case '/': // 8.2.4.37 seems to allow foo=/ as a valid attr. + $this->parseError("Expected attribute value, got tag end."); + return NULL; + case '=': + case '`': + $this->parseError("Expecting quotes, got %s.", $tok); + return $this->unquotedAttributeValue(); + default: + return $this->unquotedAttributeValue(); + } + } + + /** + * Get an attribute value string. + * + * @param string $quote + * IMPORTANT: This is a series of chars! Any one of which will be considered + * termination of an attribute's value. E.g. "\"'" will stop at either + * ' or ". + * @return string + * The attribute value. + */ + protected function quotedAttributeValue($quote) { + $stoplist = "\t\n\f" . $quote; + $val = ''; + $tok = $this->scanner->current(); + while (strspn($tok, $stoplist) == 0 && $tok !== FALSE) { + if ($tok == '&') { + $val .= $this->decodeCharacterReference(TRUE); + } + else { + $val .= $tok; + $tok = $this->scanner->next(); + } + } + return $val; + } + protected function unquotedAttributeValue() { + return $this->quotedAttributeValue(" >"); } |