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-<?php
-
-/*
-
-Copyright 2009 Geoffrey Sneddon <http://gsnedders.com/>
-
-Permission is hereby granted, free of charge, to any person obtaining a
-copy of this software and associated documentation files (the
-"Software"), to deal in the Software without restriction, including
-without limitation the rights to use, copy, modify, merge, publish,
-distribute, sublicense, and/or sell copies of the Software, and to
-permit persons to whom the Software is furnished to do so, subject to
-the following conditions:
-
-The above copyright notice and this permission notice shall be included
-in all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
-IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
-CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
-TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
-SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-*/
-
-// Some conventions:
-// /* */ indicates verbatim text from the HTML 5 specification
-// // indicates regular comments
-
-class HTML5_InputStream {
- /**
- * The string data we're parsing.
- */
- private $data;
-
- /**
- * The current integer byte position we are in $data
- */
- private $char;
-
- /**
- * Length of $data; when $char === $data, we are at the end-of-file.
- */
- private $EOF;
-
- /**
- * Parse errors.
- */
- public $errors = array();
-
- /**
- * @param $data Data to parse
- */
- public function __construct($data) {
-
- /* Given an encoding, the bytes in the input stream must be
- converted to Unicode characters for the tokeniser, as
- described by the rules for that encoding, except that the
- leading U+FEFF BYTE ORDER MARK character, if any, must not
- be stripped by the encoding layer (it is stripped by the rule below).
-
- Bytes or sequences of bytes in the original byte stream that
- could not be converted to Unicode characters must be converted
- to U+FFFD REPLACEMENT CHARACTER code points. */
-
- // XXX currently assuming input data is UTF-8; once we
- // build encoding detection this will no longer be the case
- //
- // We previously had an mbstring implementation here, but that
- // implementation is heavily non-conforming, so it's been
- // omitted.
- if (extension_loaded('iconv')) {
- // non-conforming
- $data = @iconv('UTF-8', 'UTF-8//IGNORE', $data);
- } else {
- // we can make a conforming native implementation
- throw new Exception('Not implemented, please install mbstring or iconv');
- }
-
- /* One leading U+FEFF BYTE ORDER MARK character must be
- ignored if any are present. */
- if (substr($data, 0, 3) === "\xEF\xBB\xBF") {
- $data = substr($data, 3);
- }
-
- /* All U+0000 NULL characters in the input must be replaced
- by U+FFFD REPLACEMENT CHARACTERs. Any occurrences of such
- characters is a parse error. */
- for ($i = 0, $count = substr_count($data, "\0"); $i < $count; $i++) {
- $this->errors[] = array(
- 'type' => HTML5_Tokenizer::PARSEERROR,
- 'data' => 'null-character'
- );
- }
- /* U+000D CARRIAGE RETURN (CR) characters and U+000A LINE FEED
- (LF) characters are treated specially. Any CR characters
- that are followed by LF characters must be removed, and any
- CR characters not followed by LF characters must be converted
- to LF characters. Thus, newlines in HTML DOMs are represented
- by LF characters, and there are never any CR characters in the
- input to the tokenization stage. */
- $data = str_replace(
- array(
- "\0",
- "\r\n",
- "\r"
- ),
- array(
- "\xEF\xBF\xBD",
- "\n",
- "\n"
- ),
- $data
- );
-
- /* Any occurrences of any characters in the ranges U+0001 to
- U+0008, U+000B, U+000E to U+001F, U+007F to U+009F,
- U+D800 to U+DFFF , U+FDD0 to U+FDEF, and
- characters U+FFFE, U+FFFF, U+1FFFE, U+1FFFF, U+2FFFE, U+2FFFF,
- U+3FFFE, U+3FFFF, U+4FFFE, U+4FFFF, U+5FFFE, U+5FFFF, U+6FFFE,
- U+6FFFF, U+7FFFE, U+7FFFF, U+8FFFE, U+8FFFF, U+9FFFE, U+9FFFF,
- U+AFFFE, U+AFFFF, U+BFFFE, U+BFFFF, U+CFFFE, U+CFFFF, U+DFFFE,
- U+DFFFF, U+EFFFE, U+EFFFF, U+FFFFE, U+FFFFF, U+10FFFE, and
- U+10FFFF are parse errors. (These are all control characters
- or permanently undefined Unicode characters.) */
- // Check PCRE is loaded.
- if (extension_loaded('pcre')) {
- $count = preg_match_all(
- '/(?:
- [\x01-\x08\x0B\x0E-\x1F\x7F] # U+0001 to U+0008, U+000B, U+000E to U+001F and U+007F
- |
- \xC2[\x80-\x9F] # U+0080 to U+009F
- |
- \xED(?:\xA0[\x80-\xFF]|[\xA1-\xBE][\x00-\xFF]|\xBF[\x00-\xBF]) # U+D800 to U+DFFFF
- |
- \xEF\xB7[\x90-\xAF] # U+FDD0 to U+FDEF
- |
- \xEF\xBF[\xBE\xBF] # U+FFFE and U+FFFF
- |
- [\xF0-\xF4][\x8F-\xBF]\xBF[\xBE\xBF] # U+nFFFE and U+nFFFF (1 <= n <= 10_{16})
- )/x',
- $data,
- $matches
- );
- for ($i = 0; $i < $count; $i++) {
- $this->errors[] = array(
- 'type' => HTML5_Tokenizer::PARSEERROR,
- 'data' => 'invalid-codepoint'
- );
- }
- } else {
- // XXX: Need non-PCRE impl, probably using substr_count
- }
-
- $this->data = $data;
- $this->char = 0;
- $this->EOF = strlen($data);
- }
-
- /**
- * Returns the current line that the tokenizer is at.
- */
- public function getCurrentLine() {
- // Check the string isn't empty
- if($this->EOF) {
- // Add one to $this->char because we want the number for the next
- // byte to be processed.
- return substr_count($this->data, "\n", 0, min($this->char, $this->EOF)) + 1;
- } else {
- // If the string is empty, we are on the first line (sorta).
- return 1;
- }
- }
-
- /**
- * Returns the current column of the current line that the tokenizer is at.
- */
- public function getColumnOffset() {
- // strrpos is weird, and the offset needs to be negative for what we
- // want (i.e., the last \n before $this->char). This needs to not have
- // one (to make it point to the next character, the one we want the
- // position of) added to it because strrpos's behaviour includes the
- // final offset byte.
- $lastLine = strrpos($this->data, "\n", $this->char - 1 - strlen($this->data));
-
- // However, for here we want the length up until the next byte to be
- // processed, so add one to the current byte ($this->char).
- if($lastLine !== false) {
- $findLengthOf = substr($this->data, $lastLine + 1, $this->char - 1 - $lastLine);
- } else {
- $findLengthOf = substr($this->data, 0, $this->char);
- }
-
- // Get the length for the string we need.
- if(extension_loaded('iconv')) {
- return iconv_strlen($findLengthOf, 'utf-8');
- } elseif(extension_loaded('mbstring')) {
- return mb_strlen($findLengthOf, 'utf-8');
- } elseif(extension_loaded('xml')) {
- return strlen(utf8_decode($findLengthOf));
- } else {
- $count = count_chars($findLengthOf);
- // 0x80 = 0x7F - 0 + 1 (one added to get inclusive range)
- // 0x33 = 0xF4 - 0x2C + 1 (one added to get inclusive range)
- return array_sum(array_slice($count, 0, 0x80)) +
- array_sum(array_slice($count, 0xC2, 0x33));
- }
- }
-
- /**
- * Retrieve the currently consume character.
- * @note This performs bounds checking
- */
- public function char() {
- return ($this->char++ < $this->EOF)
- ? $this->data[$this->char - 1]
- : false;
- }
-
- /**
- * Get all characters until EOF.
- * @note This performs bounds checking
- */
- public function remainingChars() {
- if($this->char < $this->EOF) {
- $data = substr($this->data, $this->char);
- $this->char = $this->EOF;
- return $data;
- } else {
- return false;
- }
- }
-
- /**
- * Matches as far as possible until we reach a certain set of bytes
- * and returns the matched substring.
- * @param $bytes Bytes to match.
- */
- public function charsUntil($bytes, $max = null) {
- if ($this->char < $this->EOF) {
- if ($max === 0 || $max) {
- $len = strcspn($this->data, $bytes, $this->char, $max);
- } else {
- $len = strcspn($this->data, $bytes, $this->char);
- }
- $string = (string) substr($this->data, $this->char, $len);
- $this->char += $len;
- return $string;
- } else {
- return false;
- }
- }
-
- /**
- * Matches as far as possible with a certain set of bytes
- * and returns the matched substring.
- * @param $bytes Bytes to match.
- */
- public function charsWhile($bytes, $max = null) {
- if ($this->char < $this->EOF) {
- if ($max === 0 || $max) {
- $len = strspn($this->data, $bytes, $this->char, $max);
- } else {
- $len = strspn($this->data, $bytes, $this->char);
- }
- $string = (string) substr($this->data, $this->char, $len);
- $this->char += $len;
- return $string;
- } else {
- return false;
- }
- }
-
- /**
- * Unconsume one character.
- */
- public function unget() {
- if ($this->char <= $this->EOF) {
- $this->char--;
- }
- }
-}
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