mirror of
https://github.com/friendica/friendica
synced 2024-10-13 02:24:34 +02:00
285 lines
10 KiB
PHP
285 lines
10 KiB
PHP
<?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--;
|
|
}
|
|
}
|
|
}
|