--- /dev/null
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * 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 <fabien@symfony.com>
+ * @author Tobias Schultze <http://tobion.de>
+ */
+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 = '/,;.:-_~+*=@|';
+
+ /**
+ * The maximum supported length of a PCRE subpattern name
+ * http://pcre.org/current/doc/html/pcre2pattern.html#SEC16.
+ *
+ * @internal
+ */
+ const VARIABLE_MAXIMUM_LENGTH = 32;
+
+ /**
+ * {@inheritdoc}
+ *
+ * @throws \LogicException If a variable is referenced more than once
+ * @throws \DomainException If a variable name starts with a digit or if it is too long to be successfully used as
+ * a PCRE subpattern.
+ */
+ public static function compile(Route $route)
+ {
+ $hostVariables = array();
+ $variables = array();
+ $hostRegex = null;
+ $hostTokens = array();
+
+ if ('' !== $host = $route->getHost()) {
+ $result = self::compilePattern($route, $host, true);
+
+ $hostVariables = $result['variables'];
+ $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);
+
+ // 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 && 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.'$'.self::REGEX_DELIMITER.'s'.($isHost ? 'i' : ''),
+ '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 int $index The index of the current token
+ * @param int $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;
+ }
+ }
+ }
+}
projects / yaffs-website / blobdiff