<?php
/*
* This file is part of the Symfony CMF package.
*
* (c) 2011-2017 Symfony CMF
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Cmf\Component\Routing\NestedMatcher;
use Symfony\Cmf\Component\Routing\RouteProviderInterface;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Routing\Exception\ResourceNotFoundException;
use Symfony\Component\Routing\Matcher\RequestMatcherInterface;
/**
* A more flexible approach to matching. The route collection to match against
* can be dynamically determined based on the request and users can inject
* their own filters or use a custom final matching strategy.
*
* The nested matcher splits matching into three configurable steps:
*
* 1) Get potential matches from a RouteProviderInterface
* 2) Apply any RouteFilterInterface to reduce the route collection
* 3) Have FinalMatcherInterface select the best match of the remaining routes
*
* @author Larry Garfield
* @author David Buchmann
*/
class NestedMatcher implements RequestMatcherInterface
{
/**
* The route provider responsible for the first-pass match.
*
* @var RouteProviderInterface
*/
protected $routeProvider;
/**
* The final matcher.
*
* @var FinalMatcherInterface
*/
protected $finalMatcher;
/**
* An array of RouteFilterInterface objects.
*
* @var RouteFilterInterface[]
*/
protected $filters = [];
/**
* Array of RouteFilterInterface objects, sorted.
*
* @var RouteFilterInterface[]
*/
protected $sortedFilters = [];
/**
* Constructs a new NestedMatcher.
*
* @param RouteProviderInterface $provider The route provider this matcher
* should use
* @param FinalMatcherInterface $final The Final Matcher to match the
* routes
*/
public function __construct(
RouteProviderInterface $provider = null,
FinalMatcherInterface $final = null
) {
if (null !== $provider) {
$this->setRouteProvider($provider);
}
if (null !== $final) {
$this->setFinalMatcher($final);
}
}
/**
* Sets the route provider for the matching plan.
*
* @param RouteProviderInterface $provider A source of routes
*
* @return NestedMatcher this object to have a fluent interface
*/
public function setRouteProvider(RouteProviderInterface $provider)
{
$this->routeProvider = $provider;
return $this;
}
/**
* Adds a partial matcher to the matching plan.
*
* Partial matchers will be run in the order in which they are added.
*
* @param RouteFilterInterface $filter
* @param int $priority (optional) The priority of the
* filter. Higher number filters will
* be used first. Defaults to 0
*
* @return NestedMatcher this object to have a fluent interface
*/
public function addRouteFilter(RouteFilterInterface $filter, $priority = 0)
{
if (empty($this->filters[$priority])) {
$this->filters[$priority] = [];
}
$this->filters[$priority][] = $filter;
$this->sortedFilters = [];
return $this;
}
/**
* Sets the final matcher for the matching plan.
*
* @param FinalMatcherInterface $final The final matcher that will have to
* pick the route that will be used
*
* @return NestedMatcher this object to have a fluent interface
*/
public function setFinalMatcher(FinalMatcherInterface $final)
{
$this->finalMatcher = $final;
return $this;
}
/**
* {@inheritdoc}
*/
public function matchRequest(Request $request)
{
$collection = $this->routeProvider->getRouteCollectionForRequest($request);
if (!count($collection)) {
throw new ResourceNotFoundException();
}
// Route filters are expected to throw an exception themselves if they
// end up filtering the list down to 0.
foreach ($this->getRouteFilters() as $filter) {
$collection = $filter->filter($collection, $request);
}
return $this->finalMatcher->finalMatch($collection, $request);
}
/**
* Sorts the filters and flattens them.
*
* @return RouteFilterInterface[] the filters ordered by priority
*/
public function getRouteFilters()
{
if (0 === count($this->sortedFilters)) {
$this->sortedFilters = $this->sortFilters();
}
return $this->sortedFilters;
}
/**
* Sort filters by priority.
*
* The highest priority number is the highest priority (reverse sorting).
*
* @return RouteFilterInterface[] the sorted filters
*/
protected function sortFilters()
{
if (0 === count($this->filters)) {
return [];
}
krsort($this->filters);
return call_user_func_array('array_merge', $this->filters);
}
}