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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--;
+ }
+ }
+}