From 4f5b44bd3bd490309eb2ba7b44df4769816ba729 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Nicolas=20L=C5=93uillet?= Date: Sat, 3 Aug 2013 19:26:54 +0200 Subject: twig implementation --- .../Symfony/Component/Routing/RouteCompiler.php | 233 +++++++++++++++++++++ 1 file changed, 233 insertions(+) create mode 100644 vendor/symfony/routing/Symfony/Component/Routing/RouteCompiler.php (limited to 'vendor/symfony/routing/Symfony/Component/Routing/RouteCompiler.php') diff --git a/vendor/symfony/routing/Symfony/Component/Routing/RouteCompiler.php b/vendor/symfony/routing/Symfony/Component/Routing/RouteCompiler.php new file mode 100644 index 00000000..7ced4b3a --- /dev/null +++ b/vendor/symfony/routing/Symfony/Component/Routing/RouteCompiler.php @@ -0,0 +1,233 @@ + + * + * For the full copyright and license information, please view the LICENSE + * file that was distributed with this source code. + */ + +namespace Symfony\Component\Routing; + +/** + * RouteCompiler compiles Route instances to CompiledRoute instances. + * + * @author Fabien Potencier + * @author Tobias Schultze + */ +class RouteCompiler implements RouteCompilerInterface +{ + const REGEX_DELIMITER = '#'; + + /** + * This string defines the characters that are automatically considered separators in front of + * optional placeholders (with default and no static text following). Such a single separator + * can be left out together with the optional placeholder from matching and generating URLs. + */ + const SEPARATORS = '/,;.:-_~+*=@|'; + + /** + * {@inheritDoc} + * + * @throws \LogicException If a variable is referenced more than once + * @throws \DomainException If a variable name is numeric because PHP raises an error for such + * subpatterns in PCRE and thus would break matching, e.g. "(?P<123>.+)". + */ + public static function compile(Route $route) + { + $staticPrefix = null; + $hostVariables = array(); + $pathVariables = array(); + $variables = array(); + $tokens = array(); + $regex = null; + $hostRegex = null; + $hostTokens = array(); + + if ('' !== $host = $route->getHost()) { + $result = self::compilePattern($route, $host, true); + + $hostVariables = $result['variables']; + $variables = array_merge($variables, $hostVariables); + + $hostTokens = $result['tokens']; + $hostRegex = $result['regex']; + } + + $path = $route->getPath(); + + $result = self::compilePattern($route, $path, false); + + $staticPrefix = $result['staticPrefix']; + + $pathVariables = $result['variables']; + $variables = array_merge($variables, $pathVariables); + + $tokens = $result['tokens']; + $regex = $result['regex']; + + return new CompiledRoute( + $staticPrefix, + $regex, + $tokens, + $pathVariables, + $hostRegex, + $hostTokens, + $hostVariables, + array_unique($variables) + ); + } + + private static function compilePattern(Route $route, $pattern, $isHost) + { + $tokens = array(); + $variables = array(); + $matches = array(); + $pos = 0; + $defaultSeparator = $isHost ? '.' : '/'; + + // 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]); + $precedingChar = strlen($precedingText) > 0 ? substr($precedingText, -1) : ''; + $isSeparator = '' !== $precedingChar && false !== strpos(static::SEPARATORS, $precedingChar); + + if (is_numeric($varName)) { + throw new \DomainException(sprintf('Variable name "%s" cannot be numeric 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, $varName)); + } + + if ($isSeparator && strlen($precedingText) > 1) { + $tokens[] = array('text', substr($precedingText, 0, -1)); + } 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); + $regexp = sprintf( + '[^%s%s]+', + preg_quote($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 .= '+'; + } + } + + $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); + } + + return array( + 'staticPrefix' => 'text' === $tokens[0][0] ? $tokens[0][1] : '', + 'regex' => self::REGEX_DELIMITER.'^'.$regexp.'$'.self::REGEX_DELIMITER.'s', + 'tokens' => array_reverse($tokens), + 'variables' => $variables, + ); + } + + /** + * Returns the next static character in the Route pattern that will serve as a separator. + * + * @param string $pattern The route pattern + * + * @return string The next static character that functions as separator (or empty string when none available) + */ + private static function findNextSeparator($pattern) + { + if ('' == $pattern) { + // return empty string if pattern is empty or false (false which can be returned by substr) + return ''; + } + // first remove all placeholders from the pattern so we can find the next real static character + $pattern = preg_replace('#\{\w+\}#', '', $pattern); + + return isset($pattern[0]) && false !== strpos(static::SEPARATORS, $pattern[0]) ? $pattern[0] : ''; + } + + /** + * Computes the regexp used to match a specific token. It can be static text or a subpattern. + * + * @param array $tokens The route tokens + * @param integer $index The index of the current token + * @param integer $firstOptional The index of the first optional token + * + * @return string The regexp pattern for a single token + */ + private static function computeRegexp(array $tokens, $index, $firstOptional) + { + $token = $tokens[$index]; + if ('text' === $token[0]) { + // Text tokens + return preg_quote($token[1], self::REGEX_DELIMITER); + } else { + // Variable tokens + if (0 === $index && 0 === $firstOptional) { + // When the only token is an optional variable token, the separator is required + return sprintf('%s(?P<%s>%s)?', preg_quote($token[1], self::REGEX_DELIMITER), $token[3], $token[2]); + } else { + $regexp = sprintf('%s(?P<%s>%s)', preg_quote($token[1], self::REGEX_DELIMITER), $token[3], $token[2]); + if ($index >= $firstOptional) { + // Enclose each optional token in a subpattern to make it optional. + // "?:" means it is non-capturing, i.e. the portion of the subject string that + // matched the optional subpattern is not passed back. + $regexp = "(?:$regexp"; + $nbTokens = count($tokens); + if ($nbTokens - 1 == $index) { + // Close the optional subpatterns + $regexp .= str_repeat(")?", $nbTokens - $firstOptional - (0 === $firstOptional ? 1 : 0)); + } + } + + return $regexp; + } + } + } +} -- cgit v1.2.3