You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
491 lines
19 KiB
PHP
491 lines
19 KiB
PHP
<?php
|
|
|
|
/**
|
|
* Our in-house implementation of a parser.
|
|
*
|
|
* A pure PHP parser, DirectLex has absolutely no dependencies, making
|
|
* it a reasonably good default for PHP4. Written with efficiency in mind,
|
|
* it can be four times faster than HTMLPurifier_Lexer_PEARSax3, although it
|
|
* pales in comparison to HTMLPurifier_Lexer_DOMLex.
|
|
*
|
|
* @todo Reread XML spec and document differences.
|
|
*/
|
|
class HTMLPurifier_Lexer_DirectLex extends HTMLPurifier_Lexer
|
|
{
|
|
|
|
public $tracksLineNumbers = true;
|
|
|
|
/**
|
|
* Whitespace characters for str(c)spn.
|
|
*/
|
|
protected $_whitespace = "\x20\x09\x0D\x0A";
|
|
|
|
/**
|
|
* Callback function for script CDATA fudge
|
|
* @param $matches, in form of array(opening tag, contents, closing tag)
|
|
*/
|
|
protected function scriptCallback($matches) {
|
|
return $matches[1] . htmlspecialchars($matches[2], ENT_COMPAT, 'UTF-8') . $matches[3];
|
|
}
|
|
|
|
public function tokenizeHTML($html, $config, $context) {
|
|
|
|
// special normalization for script tags without any armor
|
|
// our "armor" heurstic is a < sign any number of whitespaces after
|
|
// the first script tag
|
|
if ($config->get('HTML', 'Trusted')) {
|
|
$html = preg_replace_callback('#(<script[^>]*>)(\s*[^<].+?)(</script>)#si',
|
|
array($this, 'scriptCallback'), $html);
|
|
}
|
|
|
|
$html = $this->normalize($html, $config, $context);
|
|
|
|
$cursor = 0; // our location in the text
|
|
$inside_tag = false; // whether or not we're parsing the inside of a tag
|
|
$array = array(); // result array
|
|
|
|
// This is also treated to mean maintain *column* numbers too
|
|
$maintain_line_numbers = $config->get('Core', 'MaintainLineNumbers');
|
|
|
|
if ($maintain_line_numbers === null) {
|
|
// automatically determine line numbering by checking
|
|
// if error collection is on
|
|
$maintain_line_numbers = $config->get('Core', 'CollectErrors');
|
|
}
|
|
|
|
if ($maintain_line_numbers) {
|
|
$current_line = 1;
|
|
$current_col = 0;
|
|
$length = strlen($html);
|
|
} else {
|
|
$current_line = false;
|
|
$current_col = false;
|
|
$length = false;
|
|
}
|
|
$context->register('CurrentLine', $current_line);
|
|
$context->register('CurrentCol', $current_col);
|
|
$nl = "\n";
|
|
// how often to manually recalculate. This will ALWAYS be right,
|
|
// but it's pretty wasteful. Set to 0 to turn off
|
|
$synchronize_interval = $config->get('Core', 'DirectLexLineNumberSyncInterval');
|
|
|
|
$e = false;
|
|
if ($config->get('Core', 'CollectErrors')) {
|
|
$e =& $context->get('ErrorCollector');
|
|
}
|
|
|
|
// for testing synchronization
|
|
$loops = 0;
|
|
|
|
while(++$loops) {
|
|
|
|
// $cursor is either at the start of a token, or inside of
|
|
// a tag (i.e. there was a < immediately before it), as indicated
|
|
// by $inside_tag
|
|
|
|
if ($maintain_line_numbers) {
|
|
|
|
// $rcursor, however, is always at the start of a token.
|
|
$rcursor = $cursor - (int) $inside_tag;
|
|
|
|
// Column number is cheap, so we calculate it every round.
|
|
// We're interested at the *end* of the newline string, so
|
|
// we need to add strlen($nl) == 1 to $nl_pos before subtracting it
|
|
// from our "rcursor" position.
|
|
$nl_pos = strrpos($html, $nl, $rcursor - $length);
|
|
$current_col = $rcursor - (is_bool($nl_pos) ? 0 : $nl_pos + 1);
|
|
|
|
// recalculate lines
|
|
if (
|
|
$synchronize_interval && // synchronization is on
|
|
$cursor > 0 && // cursor is further than zero
|
|
$loops % $synchronize_interval === 0 // time to synchronize!
|
|
) {
|
|
$current_line = 1 + $this->substrCount($html, $nl, 0, $cursor);
|
|
}
|
|
|
|
}
|
|
|
|
$position_next_lt = strpos($html, '<', $cursor);
|
|
$position_next_gt = strpos($html, '>', $cursor);
|
|
|
|
// triggers on "<b>asdf</b>" but not "asdf <b></b>"
|
|
// special case to set up context
|
|
if ($position_next_lt === $cursor) {
|
|
$inside_tag = true;
|
|
$cursor++;
|
|
}
|
|
|
|
if (!$inside_tag && $position_next_lt !== false) {
|
|
// We are not inside tag and there still is another tag to parse
|
|
$token = new
|
|
HTMLPurifier_Token_Text(
|
|
$this->parseData(
|
|
substr(
|
|
$html, $cursor, $position_next_lt - $cursor
|
|
)
|
|
)
|
|
);
|
|
if ($maintain_line_numbers) {
|
|
$token->rawPosition($current_line, $current_col);
|
|
$current_line += $this->substrCount($html, $nl, $cursor, $position_next_lt - $cursor);
|
|
}
|
|
$array[] = $token;
|
|
$cursor = $position_next_lt + 1;
|
|
$inside_tag = true;
|
|
continue;
|
|
} elseif (!$inside_tag) {
|
|
// We are not inside tag but there are no more tags
|
|
// If we're already at the end, break
|
|
if ($cursor === strlen($html)) break;
|
|
// Create Text of rest of string
|
|
$token = new
|
|
HTMLPurifier_Token_Text(
|
|
$this->parseData(
|
|
substr(
|
|
$html, $cursor
|
|
)
|
|
)
|
|
);
|
|
if ($maintain_line_numbers) $token->rawPosition($current_line, $current_col);
|
|
$array[] = $token;
|
|
break;
|
|
} elseif ($inside_tag && $position_next_gt !== false) {
|
|
// We are in tag and it is well formed
|
|
// Grab the internals of the tag
|
|
$strlen_segment = $position_next_gt - $cursor;
|
|
|
|
if ($strlen_segment < 1) {
|
|
// there's nothing to process!
|
|
$token = new HTMLPurifier_Token_Text('<');
|
|
$cursor++;
|
|
continue;
|
|
}
|
|
|
|
$segment = substr($html, $cursor, $strlen_segment);
|
|
|
|
if ($segment === false) {
|
|
// somehow, we attempted to access beyond the end of
|
|
// the string, defense-in-depth, reported by Nate Abele
|
|
break;
|
|
}
|
|
|
|
// Check if it's a comment
|
|
if (
|
|
substr($segment, 0, 3) === '!--'
|
|
) {
|
|
// re-determine segment length, looking for -->
|
|
$position_comment_end = strpos($html, '-->', $cursor);
|
|
if ($position_comment_end === false) {
|
|
// uh oh, we have a comment that extends to
|
|
// infinity. Can't be helped: set comment
|
|
// end position to end of string
|
|
if ($e) $e->send(E_WARNING, 'Lexer: Unclosed comment');
|
|
$position_comment_end = strlen($html);
|
|
$end = true;
|
|
} else {
|
|
$end = false;
|
|
}
|
|
$strlen_segment = $position_comment_end - $cursor;
|
|
$segment = substr($html, $cursor, $strlen_segment);
|
|
$token = new
|
|
HTMLPurifier_Token_Comment(
|
|
substr(
|
|
$segment, 3, $strlen_segment - 3
|
|
)
|
|
);
|
|
if ($maintain_line_numbers) {
|
|
$token->rawPosition($current_line, $current_col);
|
|
$current_line += $this->substrCount($html, $nl, $cursor, $strlen_segment);
|
|
}
|
|
$array[] = $token;
|
|
$cursor = $end ? $position_comment_end : $position_comment_end + 3;
|
|
$inside_tag = false;
|
|
continue;
|
|
}
|
|
|
|
// Check if it's an end tag
|
|
$is_end_tag = (strpos($segment,'/') === 0);
|
|
if ($is_end_tag) {
|
|
$type = substr($segment, 1);
|
|
$token = new HTMLPurifier_Token_End($type);
|
|
if ($maintain_line_numbers) {
|
|
$token->rawPosition($current_line, $current_col);
|
|
$current_line += $this->substrCount($html, $nl, $cursor, $position_next_gt - $cursor);
|
|
}
|
|
$array[] = $token;
|
|
$inside_tag = false;
|
|
$cursor = $position_next_gt + 1;
|
|
continue;
|
|
}
|
|
|
|
// Check leading character is alnum, if not, we may
|
|
// have accidently grabbed an emoticon. Translate into
|
|
// text and go our merry way
|
|
if (!ctype_alpha($segment[0])) {
|
|
// XML: $segment[0] !== '_' && $segment[0] !== ':'
|
|
if ($e) $e->send(E_NOTICE, 'Lexer: Unescaped lt');
|
|
$token = new HTMLPurifier_Token_Text('<');
|
|
if ($maintain_line_numbers) {
|
|
$token->rawPosition($current_line, $current_col);
|
|
$current_line += $this->substrCount($html, $nl, $cursor, $position_next_gt - $cursor);
|
|
}
|
|
$array[] = $token;
|
|
$inside_tag = false;
|
|
continue;
|
|
}
|
|
|
|
// Check if it is explicitly self closing, if so, remove
|
|
// trailing slash. Remember, we could have a tag like <br>, so
|
|
// any later token processing scripts must convert improperly
|
|
// classified EmptyTags from StartTags.
|
|
$is_self_closing = (strrpos($segment,'/') === $strlen_segment-1);
|
|
if ($is_self_closing) {
|
|
$strlen_segment--;
|
|
$segment = substr($segment, 0, $strlen_segment);
|
|
}
|
|
|
|
// Check if there are any attributes
|
|
$position_first_space = strcspn($segment, $this->_whitespace);
|
|
|
|
if ($position_first_space >= $strlen_segment) {
|
|
if ($is_self_closing) {
|
|
$token = new HTMLPurifier_Token_Empty($segment);
|
|
} else {
|
|
$token = new HTMLPurifier_Token_Start($segment);
|
|
}
|
|
if ($maintain_line_numbers) {
|
|
$token->rawPosition($current_line, $current_col);
|
|
$current_line += $this->substrCount($html, $nl, $cursor, $position_next_gt - $cursor);
|
|
}
|
|
$array[] = $token;
|
|
$inside_tag = false;
|
|
$cursor = $position_next_gt + 1;
|
|
continue;
|
|
}
|
|
|
|
// Grab out all the data
|
|
$type = substr($segment, 0, $position_first_space);
|
|
$attribute_string =
|
|
trim(
|
|
substr(
|
|
$segment, $position_first_space
|
|
)
|
|
);
|
|
if ($attribute_string) {
|
|
$attr = $this->parseAttributeString(
|
|
$attribute_string
|
|
, $config, $context
|
|
);
|
|
} else {
|
|
$attr = array();
|
|
}
|
|
|
|
if ($is_self_closing) {
|
|
$token = new HTMLPurifier_Token_Empty($type, $attr);
|
|
} else {
|
|
$token = new HTMLPurifier_Token_Start($type, $attr);
|
|
}
|
|
if ($maintain_line_numbers) {
|
|
$token->rawPosition($current_line, $current_col);
|
|
$current_line += $this->substrCount($html, $nl, $cursor, $position_next_gt - $cursor);
|
|
}
|
|
$array[] = $token;
|
|
$cursor = $position_next_gt + 1;
|
|
$inside_tag = false;
|
|
continue;
|
|
} else {
|
|
// inside tag, but there's no ending > sign
|
|
if ($e) $e->send(E_WARNING, 'Lexer: Missing gt');
|
|
$token = new
|
|
HTMLPurifier_Token_Text(
|
|
'<' .
|
|
$this->parseData(
|
|
substr($html, $cursor)
|
|
)
|
|
);
|
|
if ($maintain_line_numbers) $token->rawPosition($current_line, $current_col);
|
|
// no cursor scroll? Hmm...
|
|
$array[] = $token;
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
|
|
$context->destroy('CurrentLine');
|
|
$context->destroy('CurrentCol');
|
|
return $array;
|
|
}
|
|
|
|
/**
|
|
* PHP 5.0.x compatible substr_count that implements offset and length
|
|
*/
|
|
protected function substrCount($haystack, $needle, $offset, $length) {
|
|
static $oldVersion;
|
|
if ($oldVersion === null) {
|
|
$oldVersion = version_compare(PHP_VERSION, '5.1', '<');
|
|
}
|
|
if ($oldVersion) {
|
|
$haystack = substr($haystack, $offset, $length);
|
|
return substr_count($haystack, $needle);
|
|
} else {
|
|
return substr_count($haystack, $needle, $offset, $length);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Takes the inside of an HTML tag and makes an assoc array of attributes.
|
|
*
|
|
* @param $string Inside of tag excluding name.
|
|
* @returns Assoc array of attributes.
|
|
*/
|
|
public function parseAttributeString($string, $config, $context) {
|
|
$string = (string) $string; // quick typecast
|
|
|
|
if ($string == '') return array(); // no attributes
|
|
|
|
$e = false;
|
|
if ($config->get('Core', 'CollectErrors')) {
|
|
$e =& $context->get('ErrorCollector');
|
|
}
|
|
|
|
// let's see if we can abort as quickly as possible
|
|
// one equal sign, no spaces => one attribute
|
|
$num_equal = substr_count($string, '=');
|
|
$has_space = strpos($string, ' ');
|
|
if ($num_equal === 0 && !$has_space) {
|
|
// bool attribute
|
|
return array($string => $string);
|
|
} elseif ($num_equal === 1 && !$has_space) {
|
|
// only one attribute
|
|
list($key, $quoted_value) = explode('=', $string);
|
|
$quoted_value = trim($quoted_value);
|
|
if (!$key) {
|
|
if ($e) $e->send(E_ERROR, 'Lexer: Missing attribute key');
|
|
return array();
|
|
}
|
|
if (!$quoted_value) return array($key => '');
|
|
$first_char = @$quoted_value[0];
|
|
$last_char = @$quoted_value[strlen($quoted_value)-1];
|
|
|
|
$same_quote = ($first_char == $last_char);
|
|
$open_quote = ($first_char == '"' || $first_char == "'");
|
|
|
|
if ( $same_quote && $open_quote) {
|
|
// well behaved
|
|
$value = substr($quoted_value, 1, strlen($quoted_value) - 2);
|
|
} else {
|
|
// not well behaved
|
|
if ($open_quote) {
|
|
if ($e) $e->send(E_ERROR, 'Lexer: Missing end quote');
|
|
$value = substr($quoted_value, 1);
|
|
} else {
|
|
$value = $quoted_value;
|
|
}
|
|
}
|
|
if ($value === false) $value = '';
|
|
return array($key => $value);
|
|
}
|
|
|
|
// setup loop environment
|
|
$array = array(); // return assoc array of attributes
|
|
$cursor = 0; // current position in string (moves forward)
|
|
$size = strlen($string); // size of the string (stays the same)
|
|
|
|
// if we have unquoted attributes, the parser expects a terminating
|
|
// space, so let's guarantee that there's always a terminating space.
|
|
$string .= ' ';
|
|
|
|
while(true) {
|
|
|
|
if ($cursor >= $size) {
|
|
break;
|
|
}
|
|
|
|
$cursor += ($value = strspn($string, $this->_whitespace, $cursor));
|
|
// grab the key
|
|
|
|
$key_begin = $cursor; //we're currently at the start of the key
|
|
|
|
// scroll past all characters that are the key (not whitespace or =)
|
|
$cursor += strcspn($string, $this->_whitespace . '=', $cursor);
|
|
|
|
$key_end = $cursor; // now at the end of the key
|
|
|
|
$key = substr($string, $key_begin, $key_end - $key_begin);
|
|
|
|
if (!$key) {
|
|
if ($e) $e->send(E_ERROR, 'Lexer: Missing attribute key');
|
|
$cursor += strcspn($string, $this->_whitespace, $cursor + 1); // prevent infinite loop
|
|
continue; // empty key
|
|
}
|
|
|
|
// scroll past all whitespace
|
|
$cursor += strspn($string, $this->_whitespace, $cursor);
|
|
|
|
if ($cursor >= $size) {
|
|
$array[$key] = $key;
|
|
break;
|
|
}
|
|
|
|
// if the next character is an equal sign, we've got a regular
|
|
// pair, otherwise, it's a bool attribute
|
|
$first_char = @$string[$cursor];
|
|
|
|
if ($first_char == '=') {
|
|
// key="value"
|
|
|
|
$cursor++;
|
|
$cursor += strspn($string, $this->_whitespace, $cursor);
|
|
|
|
if ($cursor === false) {
|
|
$array[$key] = '';
|
|
break;
|
|
}
|
|
|
|
// we might be in front of a quote right now
|
|
|
|
$char = @$string[$cursor];
|
|
|
|
if ($char == '"' || $char == "'") {
|
|
// it's quoted, end bound is $char
|
|
$cursor++;
|
|
$value_begin = $cursor;
|
|
$cursor = strpos($string, $char, $cursor);
|
|
$value_end = $cursor;
|
|
} else {
|
|
// it's not quoted, end bound is whitespace
|
|
$value_begin = $cursor;
|
|
$cursor += strcspn($string, $this->_whitespace, $cursor);
|
|
$value_end = $cursor;
|
|
}
|
|
|
|
// we reached a premature end
|
|
if ($cursor === false) {
|
|
$cursor = $size;
|
|
$value_end = $cursor;
|
|
}
|
|
|
|
$value = substr($string, $value_begin, $value_end - $value_begin);
|
|
if ($value === false) $value = '';
|
|
$array[$key] = $this->parseData($value);
|
|
$cursor++;
|
|
|
|
} else {
|
|
// boolattr
|
|
if ($key !== '') {
|
|
$array[$key] = $key;
|
|
} else {
|
|
// purely theoretical
|
|
if ($e) $e->send(E_ERROR, 'Lexer: Missing attribute key');
|
|
}
|
|
|
|
}
|
|
}
|
|
return $array;
|
|
}
|
|
|
|
}
|
|
|
|
// vim: et sw=4 sts=4
|