230 lines
9.8 KiB
PHP
230 lines
9.8 KiB
PHP
<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\Routing;
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/**
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* RouteCompiler compiles Route instances to CompiledRoute instances.
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*
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* @author Fabien Potencier <fabien@symfony.com>
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* @author Tobias Schultze <http://tobion.de>
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*/
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class RouteCompiler implements RouteCompilerInterface
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{
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const REGEX_DELIMITER = '#';
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/**
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* This string defines the characters that are automatically considered separators in front of
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* optional placeholders (with default and no static text following). Such a single separator
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* can be left out together with the optional placeholder from matching and generating URLs.
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*/
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const SEPARATORS = '/,;.:-_~+*=@|';
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/**
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* {@inheritdoc}
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*
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* @throws \LogicException If a variable is referenced more than once
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* @throws \DomainException If a variable name is numeric because PHP raises an error for such
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* subpatterns in PCRE and thus would break matching, e.g. "(?P<123>.+)".
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*/
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public static function compile(Route $route)
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{
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$hostVariables = array();
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$variables = array();
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$hostRegex = null;
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$hostTokens = array();
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if ('' !== $host = $route->getHost()) {
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$result = self::compilePattern($route, $host, true);
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$hostVariables = $result['variables'];
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$variables = $hostVariables;
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$hostTokens = $result['tokens'];
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$hostRegex = $result['regex'];
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}
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$path = $route->getPath();
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$result = self::compilePattern($route, $path, false);
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$staticPrefix = $result['staticPrefix'];
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$pathVariables = $result['variables'];
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$variables = array_merge($variables, $pathVariables);
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$tokens = $result['tokens'];
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$regex = $result['regex'];
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return new CompiledRoute(
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$staticPrefix,
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$regex,
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$tokens,
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$pathVariables,
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$hostRegex,
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$hostTokens,
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$hostVariables,
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array_unique($variables)
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);
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}
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private static function compilePattern(Route $route, $pattern, $isHost)
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{
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$tokens = array();
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$variables = array();
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$matches = array();
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$pos = 0;
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$defaultSeparator = $isHost ? '.' : '/';
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// Match all variables enclosed in "{}" and iterate over them. But we only want to match the innermost variable
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// in case of nested "{}", e.g. {foo{bar}}. This in ensured because \w does not match "{" or "}" itself.
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preg_match_all('#\{\w+\}#', $pattern, $matches, PREG_OFFSET_CAPTURE | PREG_SET_ORDER);
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foreach ($matches as $match) {
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$varName = substr($match[0][0], 1, -1);
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// get all static text preceding the current variable
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$precedingText = substr($pattern, $pos, $match[0][1] - $pos);
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$pos = $match[0][1] + strlen($match[0][0]);
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$precedingChar = strlen($precedingText) > 0 ? substr($precedingText, -1) : '';
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$isSeparator = '' !== $precedingChar && false !== strpos(static::SEPARATORS, $precedingChar);
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if (is_numeric($varName)) {
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throw new \DomainException(sprintf('Variable name "%s" cannot be numeric in route pattern "%s". Please use a different name.', $varName, $pattern));
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}
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if (in_array($varName, $variables)) {
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throw new \LogicException(sprintf('Route pattern "%s" cannot reference variable name "%s" more than once.', $pattern, $varName));
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}
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if ($isSeparator && strlen($precedingText) > 1) {
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$tokens[] = array('text', substr($precedingText, 0, -1));
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} elseif (!$isSeparator && strlen($precedingText) > 0) {
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$tokens[] = array('text', $precedingText);
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}
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$regexp = $route->getRequirement($varName);
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if (null === $regexp) {
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$followingPattern = (string) substr($pattern, $pos);
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// Find the next static character after the variable that functions as a separator. By default, this separator and '/'
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// are disallowed for the variable. This default requirement makes sure that optional variables can be matched at all
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// and that the generating-matching-combination of URLs unambiguous, i.e. the params used for generating the URL are
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// the same that will be matched. Example: new Route('/{page}.{_format}', array('_format' => 'html'))
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// If {page} would also match the separating dot, {_format} would never match as {page} will eagerly consume everything.
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// Also even if {_format} was not optional the requirement prevents that {page} matches something that was originally
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// part of {_format} when generating the URL, e.g. _format = 'mobile.html'.
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$nextSeparator = self::findNextSeparator($followingPattern);
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$regexp = sprintf(
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'[^%s%s]+',
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preg_quote($defaultSeparator, self::REGEX_DELIMITER),
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$defaultSeparator !== $nextSeparator && '' !== $nextSeparator ? preg_quote($nextSeparator, self::REGEX_DELIMITER) : ''
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);
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if (('' !== $nextSeparator && !preg_match('#^\{\w+\}#', $followingPattern)) || '' === $followingPattern) {
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// When we have a separator, which is disallowed for the variable, we can optimize the regex with a possessive
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// quantifier. This prevents useless backtracking of PCRE and improves performance by 20% for matching those patterns.
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// Given the above example, there is no point in backtracking into {page} (that forbids the dot) when a dot must follow
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// after it. This optimization cannot be applied when the next char is no real separator or when the next variable is
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// directly adjacent, e.g. '/{x}{y}'.
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$regexp .= '+';
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}
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}
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$tokens[] = array('variable', $isSeparator ? $precedingChar : '', $regexp, $varName);
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$variables[] = $varName;
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}
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if ($pos < strlen($pattern)) {
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$tokens[] = array('text', substr($pattern, $pos));
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}
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// find the first optional token
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$firstOptional = PHP_INT_MAX;
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if (!$isHost) {
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for ($i = count($tokens) - 1; $i >= 0; --$i) {
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$token = $tokens[$i];
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if ('variable' === $token[0] && $route->hasDefault($token[3])) {
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$firstOptional = $i;
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} else {
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break;
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}
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}
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}
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// compute the matching regexp
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$regexp = '';
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for ($i = 0, $nbToken = count($tokens); $i < $nbToken; ++$i) {
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$regexp .= self::computeRegexp($tokens, $i, $firstOptional);
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}
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return array(
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'staticPrefix' => 'text' === $tokens[0][0] ? $tokens[0][1] : '',
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'regex' => self::REGEX_DELIMITER.'^'.$regexp.'$'.self::REGEX_DELIMITER.'s'.($isHost ? 'i' : ''),
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'tokens' => array_reverse($tokens),
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'variables' => $variables,
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);
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}
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/**
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* Returns the next static character in the Route pattern that will serve as a separator.
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*
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* @param string $pattern The route pattern
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*
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* @return string The next static character that functions as separator (or empty string when none available)
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*/
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private static function findNextSeparator($pattern)
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{
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if ('' == $pattern) {
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// return empty string if pattern is empty or false (false which can be returned by substr)
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return '';
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}
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// first remove all placeholders from the pattern so we can find the next real static character
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$pattern = preg_replace('#\{\w+\}#', '', $pattern);
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return isset($pattern[0]) && false !== strpos(static::SEPARATORS, $pattern[0]) ? $pattern[0] : '';
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}
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/**
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* Computes the regexp used to match a specific token. It can be static text or a subpattern.
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*
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* @param array $tokens The route tokens
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* @param int $index The index of the current token
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* @param int $firstOptional The index of the first optional token
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*
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* @return string The regexp pattern for a single token
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*/
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private static function computeRegexp(array $tokens, $index, $firstOptional)
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{
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$token = $tokens[$index];
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if ('text' === $token[0]) {
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// Text tokens
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return preg_quote($token[1], self::REGEX_DELIMITER);
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} else {
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// Variable tokens
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if (0 === $index && 0 === $firstOptional) {
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// When the only token is an optional variable token, the separator is required
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return sprintf('%s(?P<%s>%s)?', preg_quote($token[1], self::REGEX_DELIMITER), $token[3], $token[2]);
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} else {
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$regexp = sprintf('%s(?P<%s>%s)', preg_quote($token[1], self::REGEX_DELIMITER), $token[3], $token[2]);
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if ($index >= $firstOptional) {
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// Enclose each optional token in a subpattern to make it optional.
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// "?:" means it is non-capturing, i.e. the portion of the subject string that
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// matched the optional subpattern is not passed back.
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$regexp = "(?:$regexp";
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$nbTokens = count($tokens);
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if ($nbTokens - 1 == $index) {
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// Close the optional subpatterns
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$regexp .= str_repeat(')?', $nbTokens - $firstOptional - (0 === $firstOptional ? 1 : 0));
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}
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}
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return $regexp;
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}
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}
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}
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}
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