129 lines
4.2 KiB
PHP
129 lines
4.2 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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*/
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class RouteCompiler implements RouteCompilerInterface
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{
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/**
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* Compiles the current route instance.
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*
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* @param Route $route A Route instance
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*
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* @return CompiledRoute A CompiledRoute instance
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*/
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public function compile(Route $route)
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{
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$pattern = $route->getPattern();
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$len = strlen($pattern);
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$tokens = array();
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$variables = array();
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$pos = 0;
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preg_match_all('#.\{([\w\d_]+)\}#', $pattern, $matches, PREG_OFFSET_CAPTURE | PREG_SET_ORDER);
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foreach ($matches as $match) {
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if ($text = substr($pattern, $pos, $match[0][1] - $pos)) {
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$tokens[] = array('text', $text);
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}
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$seps = array($pattern[$pos]);
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$pos = $match[0][1] + strlen($match[0][0]);
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$var = $match[1][0];
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if ($req = $route->getRequirement($var)) {
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$regexp = $req;
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} else {
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if ($pos !== $len) {
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$seps[] = $pattern[$pos];
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}
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$regexp = sprintf('[^%s]+?', preg_quote(implode('', array_unique($seps)), '#'));
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}
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$tokens[] = array('variable', $match[0][0][0], $regexp, $var);
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if (in_array($var, $variables)) {
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throw new \LogicException(sprintf('Route pattern "%s" cannot reference variable name "%s" more than once.', $route->getPattern(), $var));
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}
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$variables[] = $var;
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}
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if ($pos < $len) {
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$tokens[] = array('text', substr($pattern, $pos));
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}
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// find the first optional token
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$firstOptional = INF;
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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 = $i;
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} else {
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break;
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}
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}
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// compute the matching regexp
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$regexp = '';
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for ($i = 0, $nbToken = count($tokens); $i < $nbToken; $i++) {
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$regexp .= $this->computeRegexp($tokens, $i, $firstOptional);
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}
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return new CompiledRoute(
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$route,
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'text' === $tokens[0][0] ? $tokens[0][1] : '',
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sprintf("#^%s$#s", $regexp),
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array_reverse($tokens),
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$variables
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);
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}
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/**
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* Computes the regexp used to match the token.
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*
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* @param array $tokens The route tokens
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* @param integer $index The index of the current token
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* @param integer $firstOptional The index of the first optional token
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*
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* @return string The regexp
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*/
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private 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], '#');
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} else {
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// Variable tokens
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if (0 === $index && 0 === $firstOptional && 1 == count($tokens)) {
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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], '#'), $token[3], $token[2]);
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} else {
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$nbTokens = count($tokens);
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$regexp = sprintf('%s(?P<%s>%s)', preg_quote($token[1], '#'), $token[3], $token[2]);
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if ($index >= $firstOptional) {
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// Enclose each optional tokens in a subpattern to make it optional
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$regexp = "(?:$regexp";
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if ($nbTokens - 1 == $index) {
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// Close the optional subpatterns
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$regexp .= str_repeat(")?", $nbTokens - $firstOptional);
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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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