private static function compilePattern(Route $route, $pattern, $isHost)
{
$tokens = array();
$variables = array();
$matches = array();
$pos = 0;
$defaultSeparator = $isHost ? '.' : '/';
$useUtf8 = preg_match('//u', $pattern);
$needsUtf8 = $route->getOption('utf8');
if (!$needsUtf8 && $useUtf8 && preg_match('/[\\x80-\\xFF]/', $pattern)) {
$needsUtf8 = true;
@trigger_error(sprintf('Using UTF-8 route patterns without setting the "utf8" option is deprecated since Symfony 3.2 and will throw a LogicException in 4.0. Turn on the "utf8" route option for pattern "%s".', $pattern), E_USER_DEPRECATED);
}
if (!$useUtf8 && $needsUtf8) {
throw new \LogicException(sprintf('Cannot mix UTF-8 requirements with non-UTF-8 pattern "%s".', $pattern));
}
// Match all variables enclosed in "{}" and iterate over them. But we only want to match the innermost variable
// in case of nested "{}", e.g. {foo{bar}}. This in ensured because \w does not match "{" or "}" itself.
preg_match_all('#\\{\\w+\\}#', $pattern, $matches, PREG_OFFSET_CAPTURE | PREG_SET_ORDER);
foreach ($matches as $match) {
$varName = substr($match[0][0], 1, -1);
// get all static text preceding the current variable
$precedingText = substr($pattern, $pos, $match[0][1] - $pos);
$pos = $match[0][1] + strlen($match[0][0]);
if (!strlen($precedingText)) {
$precedingChar = '';
} elseif ($useUtf8) {
preg_match('/.$/u', $precedingText, $precedingChar);
$precedingChar = $precedingChar[0];
} else {
$precedingChar = substr($precedingText, -1);
}
$isSeparator = '' !== $precedingChar && false !== strpos(static::SEPARATORS, $precedingChar);
// A PCRE subpattern name must start with a non-digit. Also a PHP variable cannot start with a digit so the
// variable would not be usable as a Controller action argument.
if (preg_match('/^\\d/', $varName)) {
throw new \DomainException(sprintf('Variable name "%s" cannot start with a digit in route pattern "%s". Please use a different name.', $varName, $pattern));
}
if (in_array($varName, $variables)) {
throw new \LogicException(sprintf('Route pattern "%s" cannot reference variable name "%s" more than once.', $pattern, $varName));
}
if (strlen($varName) > self::VARIABLE_MAXIMUM_LENGTH) {
throw new \DomainException(sprintf('Variable name "%s" cannot be longer than %s characters in route pattern "%s". Please use a shorter name.', $varName, self::VARIABLE_MAXIMUM_LENGTH, $pattern));
}
if ($isSeparator && $precedingText !== $precedingChar) {
$tokens[] = array('text', substr($precedingText, 0, -strlen($precedingChar)));
} elseif (!$isSeparator && strlen($precedingText) > 0) {
$tokens[] = array('text', $precedingText);
}
$regexp = $route->getRequirement($varName);
if (null === $regexp) {
$followingPattern = (string) substr($pattern, $pos);
// Find the next static character after the variable that functions as a separator. By default, this separator and '/'
// are disallowed for the variable. This default requirement makes sure that optional variables can be matched at all
// and that the generating-matching-combination of URLs unambiguous, i.e. the params used for generating the URL are
// the same that will be matched. Example: new Route('/{page}.{_format}', array('_format' => 'html'))
// If {page} would also match the separating dot, {_format} would never match as {page} will eagerly consume everything.
// Also even if {_format} was not optional the requirement prevents that {page} matches something that was originally
// part of {_format} when generating the URL, e.g. _format = 'mobile.html'.
$nextSeparator = self::findNextSeparator($followingPattern, $useUtf8);
$regexp = sprintf('[^%s%s]+', preg_quote($defaultSeparator, self::REGEX_DELIMITER), $defaultSeparator !== $nextSeparator && '' !== $nextSeparator ? preg_quote($nextSeparator, self::REGEX_DELIMITER) : '');
if ('' !== $nextSeparator && !preg_match('#^\\{\\w+\\}#', $followingPattern) || '' === $followingPattern) {
// When we have a separator, which is disallowed for the variable, we can optimize the regex with a possessive
// quantifier. This prevents useless backtracking of PCRE and improves performance by 20% for matching those patterns.
// Given the above example, there is no point in backtracking into {page} (that forbids the dot) when a dot must follow
// after it. This optimization cannot be applied when the next char is no real separator or when the next variable is
// directly adjacent, e.g. '/{x}{y}'.
$regexp .= '+';
}
} else {
if (!preg_match('//u', $regexp)) {
$useUtf8 = false;
} elseif (!$needsUtf8 && preg_match('/[\\x80-\\xFF]|(?<!\\\\)\\\\(?:\\\\\\\\)*+(?-i:X|[pP][\\{CLMNPSZ]|x\\{[A-Fa-f0-9]{3})/', $regexp)) {
$needsUtf8 = true;
@trigger_error(sprintf('Using UTF-8 route requirements without setting the "utf8" option is deprecated since Symfony 3.2 and will throw a LogicException in 4.0. Turn on the "utf8" route option for variable "%s" in pattern "%s".', $varName, $pattern), E_USER_DEPRECATED);
}
if (!$useUtf8 && $needsUtf8) {
throw new \LogicException(sprintf('Cannot mix UTF-8 requirement with non-UTF-8 charset for variable "%s" in pattern "%s".', $varName, $pattern));
}
}
$tokens[] = array('variable', $isSeparator ? $precedingChar : '', $regexp, $varName);
$variables[] = $varName;
}
if ($pos < strlen($pattern)) {
$tokens[] = array('text', substr($pattern, $pos));
}
// find the first optional token
$firstOptional = PHP_INT_MAX;
if (!$isHost) {
for ($i = count($tokens) - 1; $i >= 0; --$i) {
$token = $tokens[$i];
if ('variable' === $token[0] && $route->hasDefault($token[3])) {
$firstOptional = $i;
} else {
break;
}
}
}
// compute the matching regexp
$regexp = '';
for ($i = 0, $nbToken = count($tokens); $i < $nbToken; ++$i) {
$regexp .= self::computeRegexp($tokens, $i, $firstOptional);
}
$regexp = self::REGEX_DELIMITER . '^' . $regexp . '$' . self::REGEX_DELIMITER . 's' . ($isHost ? 'i' : '');
// enable Utf8 matching if really required
if ($needsUtf8) {
$regexp .= 'u';
for ($i = 0, $nbToken = count($tokens); $i < $nbToken; ++$i) {
if ('variable' === $tokens[$i][0]) {
$tokens[$i][] = true;
}
}
}
return array('staticPrefix' => 'text' === $tokens[0][0] ? $tokens[0][1] : '', 'regex' => $regexp, 'tokens' => array_reverse($tokens), 'variables' => $variables);
}
