public static function toJS($regexp, $isGlobal = \false)
{
$regexpInfo = RegexpParser::parse($regexp);
$dotAll = \strpos($regexpInfo['modifiers'], 's') !== \false;
$regexp = '';
$pos = 0;
foreach ($regexpInfo['tokens'] as $tok) {
$regexp .= self::convertUnicodeCharacters(\substr($regexpInfo['regexp'], $pos, $tok['pos'] - $pos), \false, $dotAll);
switch ($tok['type']) {
case 'option':
if ($tok['options'] !== 'J') {
throw new RuntimeException('Regexp options are not supported');
}
break;
case 'capturingSubpatternStart':
$regexp .= '(';
break;
case 'nonCapturingSubpatternStart':
if (!empty($tok['options'])) {
throw new RuntimeException('Subpattern options are not supported');
}
$regexp .= '(?:';
break;
case 'capturingSubpatternEnd':
case 'nonCapturingSubpatternEnd':
$regexp .= ')' . \substr($tok['quantifiers'], 0, 1);
break;
case 'characterClass':
$regexp .= '[';
$regexp .= self::convertUnicodeCharacters($tok['content'], \true, \false);
$regexp .= ']' . \substr($tok['quantifiers'], 0, 1);
break;
case 'lookaheadAssertionStart':
$regexp .= '(?=';
break;
case 'negativeLookaheadAssertionStart':
$regexp .= '(?!';
break;
case 'lookaheadAssertionEnd':
case 'negativeLookaheadAssertionEnd':
$regexp .= ')';
break;
default:
throw new RuntimeException("Unsupported token type '" . $tok['type'] . "'");
}
$pos = $tok['pos'] + $tok['len'];
}
$regexp .= self::convertUnicodeCharacters(\substr($regexpInfo['regexp'], $pos), \false, $dotAll);
if ($regexpInfo['delimiter'] !== '/') {
$regexp = \preg_replace('#(?<!\\\\)((?:\\\\\\\\)*+)/#', '$1\\/', $regexp);
}
$modifiers = \preg_replace('#[^im]#', '', $regexpInfo['modifiers']);
if ($isGlobal) {
$modifiers .= 'g';
}
return '/' . self::escapeLineTerminators($regexp) . '/' . $modifiers;
}
public function isSafeInCSS()
{
try {
$regexp = RegexpParser::getAllowedCharacterRegexp($this->vars['regexp']);
foreach (ContextSafeness::getDisallowedCharactersInCSS() as $char) {
if (\preg_match($regexp, $char)) {
return \false;
}
}
return \true;
} catch (Exception $e) {
return \false;
}
}
/**
* Return all the named captures with a standalone regexp that matches them
*
* @return array Array of [capture name => regexp]
*/
public function getNamedCaptures()
{
$captures = [];
$regexpInfo = RegexpParser::parse($this->regexp);
// Prepare the start/end of the regexp and ensure that we use the D modifier
$start = $regexpInfo['delimiter'] . '^';
$end = '$' . $regexpInfo['delimiter'] . $regexpInfo['modifiers'];
if (strpos($regexpInfo['modifiers'], 'D') === false) {
$end .= 'D';
}
foreach ($this->getNamedCapturesExpressions($regexpInfo['tokens']) as $name => $expr) {
$captures[$name] = $start . $expr . $end;
}
return $captures;
}
/**
* {@inheritdoc}
*/
public function isSafeInCSS()
{
try {
// Test whether this regexp could allow any character that's disallowed in URLs
$regexp = RegexpParser::getAllowedCharacterRegexp($this->vars['regexp']);
foreach (ContextSafeness::getDisallowedCharactersInCSS() as $char) {
if (preg_match($regexp, $char)) {
return false;
}
}
return true;
} catch (Exception $e) {
// If anything unexpected happens, we'll consider this filter is not safe
return false;
}
}
/**
* Parse a regexp and return its info
*
* @param string $regexp
* @return array
*/
protected function getRegexpInfo($regexp)
{
$valid = false;
try {
$valid = @preg_match_all($regexp, '', $m);
} catch (Exception $e) {
// Nothing to do here
}
if ($valid === false) {
throw new InvalidArgumentException('Invalid regexp');
}
return RegexpParser::parse($regexp);
}
/**
* Make an entire regexp optional through the use of the ? quantifier
*
* @param string $regexp
* @return string
*/
protected static function makeRegexpOptional($regexp)
{
// .+ and .+? become .* and .*?
if (preg_match('#^\\.\\+\\??$#', $regexp)) {
return str_replace('+', '*', $regexp);
}
// Special case: xx? becomes x?x?, \w\w? becomes \w?\w?
// It covers only the most common case of repetition, it's not a panacea
if (preg_match('#^(\\\\?.)((?:\\1\\?)+)$#Du', $regexp, $m)) {
return $m[1] . '?' . $m[2];
}
// Optional assertions are a no-op
if (preg_match('#^(?:[$^]|\\\\[bBAZzGQEK])$#', $regexp)) {
return '';
}
// One single character, optionally escaped
if (preg_match('#^\\\\?.$#Dus', $regexp)) {
$isAtomic = true;
} elseif (preg_match('#^[^[(].#s', $regexp)) {
$isAtomic = false;
} else {
$def = RegexpParser::parse('#' . $regexp . '#');
$tokens = $def['tokens'];
switch (count($tokens)) {
// One character class
case 1:
$startPos = $tokens[0]['pos'];
$len = $tokens[0]['len'];
$isAtomic = (bool) ($startPos === 0 && $len === strlen($regexp));
// If the regexp is [..]+ it becomes [..]* (to which a ? will be appended)
if ($isAtomic && $tokens[0]['type'] === 'characterClass') {
$regexp = rtrim($regexp, '+*?');
if (!empty($tokens[0]['quantifiers']) && $tokens[0]['quantifiers'] !== '?') {
$regexp .= '*';
}
}
break;
// One subpattern covering the entire regexp
// One subpattern covering the entire regexp
case 2:
if ($tokens[0]['type'] === 'nonCapturingSubpatternStart' && $tokens[1]['type'] === 'nonCapturingSubpatternEnd') {
$startPos = $tokens[0]['pos'];
$len = $tokens[1]['pos'] + $tokens[1]['len'];
$isAtomic = (bool) ($startPos === 0 && $len === strlen($regexp));
// If the tokens are not a non-capturing subpattern, we let it fall through
break;
}
// no break; here
// no break; here
default:
$isAtomic = false;
}
}
if (!$isAtomic) {
$regexp = (self::canUseAtomicGrouping($regexp) ? '(?>' : '(?:') . $regexp . ')';
}
$regexp .= '?';
return $regexp;
}
/**
* @testdox getCaptureNames() works
* @dataProvider getGetCaptureNamesTests
*/
public function testGetCaptureNamesTests($regexp, array $expected)
{
$this->assertSame($expected, RegexpParser::getCaptureNames($regexp));
}