feature #12979 [Router] added appending of new optional document fragment (rodnaph)

This PR was merged into the 3.2-dev branch.

Discussion
----------

[Router] added appending of new optional document fragment

added a new optional parameter to the generate method for the document fragment. when specified this is appended to generated urls.

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | none
| License       | MIT
| Doc PR        | none

Commits
-------

6d79a56 [Routing] adds _fragment special option to url generation for document fragment

src/Symfony/Component/Routing/Generator/UrlGenerator.php

@@ -257,6 +257,13 @@ class UrlGenerator implements UrlGeneratorInterface, ConfigurableRequirementsInt
             $url = $schemeAuthority.$this->context->getBaseUrl().$url;
         }
 
+        // extract unused parameters
+        $extra = array_diff_key($parameters, $variables, $defaults);
+
+        // extract fragment
+        $fragment = isset($extra['_fragment']) ? $extra['_fragment'] : '';
+        unset($extra['_fragment']);
+
         // add a query string if needed
         $extra = array_udiff_assoc(array_diff_key($parameters, $variables), $defaults, function ($a, $b) {
             return $a == $b ? 0 : 1;
@@ -268,6 +275,10 @@ class UrlGenerator implements UrlGeneratorInterface, ConfigurableRequirementsInt
             $url .= '?'.strtr($query, array('%2F' => '/'));
         }
 
+        if ('' !== $fragment) {
+            $url .= '#'.strtr(rawurlencode($fragment), array('%2F' => '/', '%3F' => '?'));
+        }
+
         return $url;
     }
 

src/Symfony/Component/Routing/Generator/UrlGeneratorInterface.php

@@ -69,6 +69,8 @@ interface UrlGeneratorInterface extends RequestContextAwareInterface
      *
      * If there is no route with the given name, the generator must throw the RouteNotFoundException.
      *
+     * The special parameter _fragment will be used as the document fragment suffixed to the final URL.
+     *
      * @param string $name          The name of the route
      * @param mixed  $parameters    An array of parameters
      * @param int    $referenceType The type of reference to be generated (one of the constants)

src/Symfony/Component/Routing/RouteCompiler.php

@@ -31,9 +31,10 @@ class RouteCompiler implements RouteCompilerInterface
     /**
      * {@inheritdoc}
      *
-     * @throws \LogicException  If a variable is referenced more than once
+     * @throws \InvalidArgumentException If a path variable is named _fragment
-     * @throws \DomainException If a variable name is numeric because PHP raises an error for such
+     * @throws \LogicException           If a variable is referenced more than once
-     *                          subpatterns in PCRE and thus would break matching, e.g. "(?P<123>.+)".
+     * @throws \DomainException          If a variable name is numeric because PHP raises an error for such
+     *                                   subpatterns in PCRE and thus would break matching, e.g. "(?P<123>.+)".
      */
     public static function compile(Route $route)
     {
@@ -59,6 +60,13 @@ class RouteCompiler implements RouteCompilerInterface
         $staticPrefix = $result['staticPrefix'];
 
         $pathVariables = $result['variables'];
+
+        foreach ($pathVariables as $pathParam) {
+            if ('_fragment' === $pathParam) {
+                throw new \InvalidArgumentException(sprintf('Route pattern "%s" cannot contain "_fragment" as a path parameter.', $route->getPath()));
+            }
+        }
+
         $variables = array_merge($variables, $pathVariables);
 
         $tokens = $result['tokens'];

src/Symfony/Component/Routing/Tests/Generator/UrlGeneratorTest.php

@@ -634,6 +634,25 @@ class UrlGeneratorTest extends \PHPUnit_Framework_TestCase
         );
     }
 
+    public function testFragmentsCanBeAppendedToUrls()
+    {
+        $routes = $this->getRoutes('test', new Route('/testing'));
+
+        $url = $this->getGenerator($routes)->generate('test', array('_fragment' => 'frag ment'), true);
+        $this->assertEquals('/app.php/testing#frag%20ment', $url);
+
+        $url = $this->getGenerator($routes)->generate('test', array('_fragment' => '0'), true);
+        $this->assertEquals('/app.php/testing#0', $url);
+    }
+
+    public function testFragmentsDoNotEscapeValidCharacters()
+    {
+        $routes = $this->getRoutes('test', new Route('/testing'));
+        $url = $this->getGenerator($routes)->generate('test', array('_fragment' => '?/'), true);
+
+        $this->assertEquals('/app.php/testing#?/', $url);
+    }
+
     protected function getGenerator(RouteCollection $routes, array $parameters = array(), $logger = null)
     {
         $context = new RequestContext('/app.php');

src/Symfony/Component/Routing/Tests/RouteCompilerTest.php

@@ -175,6 +175,16 @@ class RouteCompilerTest extends \PHPUnit_Framework_TestCase
         $compiled = $route->compile();
     }
 
+    /**
+     * @expectedException \InvalidArgumentException
+     */
+    public function testRouteWithFragmentAsPathParameter()
+    {
+        $route = new Route('/{_fragment}');
+
+        $compiled = $route->compile();
+    }
+
     /**
      * @dataProvider getNumericVariableNames
      * @expectedException \DomainException