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<?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\Matcher\Dumper;
use Symfony\Component\Routing\Route;
use Symfony\Component\Routing\RouteCollection;
use Symfony\Component\ExpressionLanguage\ExpressionLanguage;
use Symfony\Component\ExpressionLanguage\ExpressionFunctionProviderInterface;
/**
* PhpMatcherDumper creates a PHP class able to match URLs for a given set of routes.
*
* @author Fabien Potencier <fabien@symfony.com>
* @author Tobias Schultze <http://tobion.de>
* @author Arnaud Le Blanc <arnaud.lb@gmail.com>
*/
class PhpMatcherDumper extends MatcherDumper
{
private $expressionLanguage;
/**
* @var ExpressionFunctionProviderInterface[]
*/
private $expressionLanguageProviders = array();
/**
* Dumps a set of routes to a PHP class.
*
* Available options:
*
* * class: The class name
* * base_class: The base class name
*
* @param array $options An array of options
*
* @return string A PHP class representing the matcher class
*/
public function dump(array $options = array())
{
$options = array_replace(array(
'class' => 'ProjectUrlMatcher',
'base_class' => 'Symfony\\Component\\Routing\\Matcher\\UrlMatcher',
), $options);
// trailing slash support is only enabled if we know how to redirect the user
$interfaces = class_implements($options['base_class']);
$supportsRedirections = isset($interfaces['Symfony\\Component\\Routing\\Matcher\\RedirectableUrlMatcherInterface']);
return <<<EOF
<?php
use Symfony\Component\Routing\Exception\MethodNotAllowedException;
use Symfony\Component\Routing\Exception\ResourceNotFoundException;
use Symfony\Component\Routing\RequestContext;
/**
* {$options['class']}.
*
* This class has been auto-generated
* by the Symfony Routing Component.
*/
class {$options['class']} extends {$options['base_class']}
{
/**
* Constructor.
*/
public function __construct(RequestContext \$context)
{
\$this->context = \$context;
}
{$this->generateMatchMethod($supportsRedirections)}
}
EOF;
}
public function addExpressionLanguageProvider(ExpressionFunctionProviderInterface $provider)
{
$this->expressionLanguageProviders[] = $provider;
}
/**
* Generates the code for the match method implementing UrlMatcherInterface.
*
* @param bool $supportsRedirections Whether redirections are supported by the base class
*
* @return string Match method as PHP code
*/
private function generateMatchMethod($supportsRedirections)
{
$code = rtrim($this->compileRoutes($this->getRoutes(), $supportsRedirections), "\n");
return <<<EOF
public function match(\$pathinfo)
{
\$allow = array();
\$pathinfo = rawurldecode(\$pathinfo);
\$context = \$this->context;
\$request = \$this->request;
$code
throw 0 < count(\$allow) ? new MethodNotAllowedException(array_unique(\$allow)) : new ResourceNotFoundException();
}
EOF;
}
/**
* Generates PHP code to match a RouteCollection with all its routes.
*
* @param RouteCollection $routes A RouteCollection instance
* @param bool $supportsRedirections Whether redirections are supported by the base class
*
* @return string PHP code
*/
private function compileRoutes(RouteCollection $routes, $supportsRedirections)
{
$fetchedHost = false;
$groups = $this->groupRoutesByHostRegex($routes);
$code = '';
foreach ($groups as $collection) {
if (null !== $regex = $collection->getAttribute('host_regex')) {
if (!$fetchedHost) {
$code .= " \$host = \$this->context->getHost();\n\n";
$fetchedHost = true;
}
$code .= sprintf(" if (preg_match(%s, \$host, \$hostMatches)) {\n", var_export($regex, true));
}
$tree = $this->buildPrefixTree($collection);
$groupCode = $this->compilePrefixRoutes($tree, $supportsRedirections);
if (null !== $regex) {
// apply extra indention at each line (except empty ones)
$groupCode = preg_replace('/^.{2,}$/m', ' $0', $groupCode);
$code .= $groupCode;
$code .= " }\n\n";
} else {
$code .= $groupCode;
}
}
return $code;
}
/**
* Generates PHP code recursively to match a tree of routes.
*
* @param DumperPrefixCollection $collection A DumperPrefixCollection instance
* @param bool $supportsRedirections Whether redirections are supported by the base class
* @param string $parentPrefix Prefix of the parent collection
*
* @return string PHP code
*/
private function compilePrefixRoutes(DumperPrefixCollection $collection, $supportsRedirections, $parentPrefix = '')
{
$code = '';
$prefix = $collection->getPrefix();
$optimizable = 1 < strlen($prefix) && 1 < count($collection->all());
$optimizedPrefix = $parentPrefix;
if ($optimizable) {
$optimizedPrefix = $prefix;
$code .= sprintf(" if (0 === strpos(\$pathinfo, %s)) {\n", var_export($prefix, true));
}
foreach ($collection as $route) {
if ($route instanceof DumperCollection) {
$code .= $this->compilePrefixRoutes($route, $supportsRedirections, $optimizedPrefix);
} else {
$code .= $this->compileRoute($route->getRoute(), $route->getName(), $supportsRedirections, $optimizedPrefix)."\n";
}
}
if ($optimizable) {
$code .= " }\n\n";
// apply extra indention at each line (except empty ones)
$code = preg_replace('/^.{2,}$/m', ' $0', $code);
}
return $code;
}
/**
* Compiles a single Route to PHP code used to match it against the path info.
*
* @param Route $route A Route instance
* @param string $name The name of the Route
* @param bool $supportsRedirections Whether redirections are supported by the base class
* @param string|null $parentPrefix The prefix of the parent collection used to optimize the code
*
* @return string PHP code
*
* @throws \LogicException
*/
private function compileRoute(Route $route, $name, $supportsRedirections, $parentPrefix = null)
{
$code = '';
$compiledRoute = $route->compile();
$conditions = array();
$hasTrailingSlash = false;
$matches = false;
$hostMatches = false;
$methods = $route->getMethods();
// GET and HEAD are equivalent
if (in_array('GET', $methods) && !in_array('HEAD', $methods)) {
$methods[] = 'HEAD';
}
$supportsTrailingSlash = $supportsRedirections && (!$methods || in_array('HEAD', $methods));
if (!count($compiledRoute->getPathVariables()) && false !== preg_match('#^(.)\^(?P<url>.*?)\$\1#', $compiledRoute->getRegex(), $m)) {
if ($supportsTrailingSlash && substr($m['url'], -1) === '/') {
$conditions[] = sprintf("rtrim(\$pathinfo, '/') === %s", var_export(rtrim(str_replace('\\', '', $m['url']), '/'), true));
$hasTrailingSlash = true;
} else {
$conditions[] = sprintf('$pathinfo === %s', var_export(str_replace('\\', '', $m['url']), true));
}
} else {
if ($compiledRoute->getStaticPrefix() && $compiledRoute->getStaticPrefix() !== $parentPrefix) {
$conditions[] = sprintf('0 === strpos($pathinfo, %s)', var_export($compiledRoute->getStaticPrefix(), true));
}
$regex = $compiledRoute->getRegex();
if ($supportsTrailingSlash && $pos = strpos($regex, '/$')) {
$regex = substr($regex, 0, $pos).'/?$'.substr($regex, $pos + 2);
$hasTrailingSlash = true;
}
$conditions[] = sprintf('preg_match(%s, $pathinfo, $matches)', var_export($regex, true));
$matches = true;
}
if ($compiledRoute->getHostVariables()) {
$hostMatches = true;
}
if ($route->getCondition()) {
$conditions[] = $this->getExpressionLanguage()->compile($route->getCondition(), array('context', 'request'));
}
$conditions = implode(' && ', $conditions);
$code .= <<<EOF
// $name
if ($conditions) {
EOF;
$gotoname = 'not_'.preg_replace('/[^A-Za-z0-9_]/', '', $name);
if ($methods) {
if (1 === count($methods)) {
$code .= <<<EOF
if (\$this->context->getMethod() != '$methods[0]') {
\$allow[] = '$methods[0]';
goto $gotoname;
}
EOF;
} else {
$methods = implode("', '", $methods);
$code .= <<<EOF
if (!in_array(\$this->context->getMethod(), array('$methods'))) {
\$allow = array_merge(\$allow, array('$methods'));
goto $gotoname;
}
EOF;
}
}
if ($hasTrailingSlash) {
$code .= <<<EOF
if (substr(\$pathinfo, -1) !== '/') {
return \$this->redirect(\$pathinfo.'/', '$name');
}
EOF;
}
if ($schemes = $route->getSchemes()) {
if (!$supportsRedirections) {
throw new \LogicException('The "schemes" requirement is only supported for URL matchers that implement RedirectableUrlMatcherInterface.');
}
$schemes = str_replace("\n", '', var_export(array_flip($schemes), true));
$code .= <<<EOF
\$requiredSchemes = $schemes;
if (!isset(\$requiredSchemes[\$this->context->getScheme()])) {
return \$this->redirect(\$pathinfo, '$name', key(\$requiredSchemes));
}
EOF;
}
// optimize parameters array
if ($matches || $hostMatches) {
$vars = array();
if ($hostMatches) {
$vars[] = '$hostMatches';
}
if ($matches) {
$vars[] = '$matches';
}
$vars[] = "array('_route' => '$name')";
$code .= sprintf(
" return \$this->mergeDefaults(array_replace(%s), %s);\n",
implode(', ', $vars),
str_replace("\n", '', var_export($route->getDefaults(), true))
);
} elseif ($route->getDefaults()) {
$code .= sprintf(" return %s;\n", str_replace("\n", '', var_export(array_replace($route->getDefaults(), array('_route' => $name)), true)));
} else {
$code .= sprintf(" return array('_route' => '%s');\n", $name);
}
$code .= " }\n";
if ($methods) {
$code .= " $gotoname:\n";
}
return $code;
}
/**
* Groups consecutive routes having the same host regex.
*
* The result is a collection of collections of routes having the same host regex.
*
* @param RouteCollection $routes A flat RouteCollection
*
* @return DumperCollection A collection with routes grouped by host regex in sub-collections
*/
private function groupRoutesByHostRegex(RouteCollection $routes)
{
$groups = new DumperCollection();
$currentGroup = new DumperCollection();
$currentGroup->setAttribute('host_regex', null);
$groups->add($currentGroup);
foreach ($routes as $name => $route) {
$hostRegex = $route->compile()->getHostRegex();
if ($currentGroup->getAttribute('host_regex') !== $hostRegex) {
$currentGroup = new DumperCollection();
$currentGroup->setAttribute('host_regex', $hostRegex);
$groups->add($currentGroup);
}
$currentGroup->add(new DumperRoute($name, $route));
}
return $groups;
}
/**
* Organizes the routes into a prefix tree.
*
* Routes order is preserved such that traversing the tree will traverse the
* routes in the origin order.
*
* @param DumperCollection $collection A collection of routes
*
* @return DumperPrefixCollection
*/
private function buildPrefixTree(DumperCollection $collection)
{
$tree = new DumperPrefixCollection();
$current = $tree;
foreach ($collection as $route) {
$current = $current->addPrefixRoute($route);
}
$tree->mergeSlashNodes();
return $tree;
}
private function getExpressionLanguage()
{
if (null === $this->expressionLanguage) {
if (!class_exists('Symfony\Component\ExpressionLanguage\ExpressionLanguage')) {
throw new \RuntimeException('Unable to use expressions as the Symfony ExpressionLanguage component is not installed.');
}
$this->expressionLanguage = new ExpressionLanguage(null, $this->expressionLanguageProviders);
}
return $this->expressionLanguage;
}
}