bug #12030 Fix expression language in the container when using the "container" variable (fabpot)

This PR was squashed before being merged into the 2.4 branch (closes #12030).

Discussion
----------

Fix expression language in the container when using the "container" variable

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #11995
| License       | MIT
| Doc PR        | n/a

See #11995 for the description of the problem.

Commits
-------

2b2f0df Fix expression language in the container when using the "container" variable

src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php

@@ -1212,7 +1212,7 @@ EOF;
 
             return $this->getServiceCall((string) $value, $value);
         } elseif ($value instanceof Expression) {
-            return $this->getExpressionLanguage()->compile((string) $value, array('container'));
+            return $this->getExpressionLanguage()->compile((string) $value, array('this' => 'container'));
         } elseif ($value instanceof Parameter) {
             return $this->dumpParameter($value);
         } elseif (true === $interpolate && is_string($value)) {

src/Symfony/Component/DependencyInjection/Tests/Fixtures/containers/container9.php

@@ -52,7 +52,7 @@ $container->
     addMethodCall('setBar', array(new Reference('foo2', ContainerInterface::NULL_ON_INVALID_REFERENCE)))->
     addMethodCall('setBar', array(new Reference('foo3', ContainerInterface::IGNORE_ON_INVALID_REFERENCE)))->
     addMethodCall('setBar', array(new Reference('foobaz', ContainerInterface::IGNORE_ON_INVALID_REFERENCE)))->
-    addMethodCall('setBar', array(new Expression('service("foo").foo() ~ parameter("foo")')))
+    addMethodCall('setBar', array(new Expression('service("foo").foo() ~ (container.hasparameter("foo") ? parameter("foo") : "default")')))
 ;
 $container->
     register('factory_service', 'Bar')->

src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9.php

@@ -197,7 +197,7 @@ class ProjectServiceContainer extends Container
         if ($this->has('foobaz')) {
             $instance->setBar($this->get('foobaz', ContainerInterface::NULL_ON_INVALID_REFERENCE));
         }
-        $instance->setBar(($this->get("foo")->foo() . $this->getParameter("foo")));
+        $instance->setBar(($this->get("foo")->foo() . (($this->hasparameter("foo")) ? ($this->getParameter("foo")) : ("default"))));
 
         return $instance;
     }

src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9_compiled.php

@@ -202,7 +202,7 @@ class ProjectServiceContainer extends Container
 
         $instance->setBar($this->get('foo'));
         $instance->setBar(NULL);
-        $instance->setBar(($this->get("foo")->foo() . $this->getParameter("foo")));
+        $instance->setBar(($this->get("foo")->foo() . (($this->hasparameter("foo")) ? ($this->getParameter("foo")) : ("default"))));
 
         return $instance;
     }

src/Symfony/Component/DependencyInjection/Tests/Fixtures/xml/services6.xml

@@ -33,7 +33,7 @@
     <service id="method_call1" class="FooClass">
       <call method="setBar" />
       <call method="setBar">
-        <argument type="expression">service("foo").foo() ~ parameter("foo")</argument>
+        <argument type="expression">service("foo").foo() ~ (container.hasparameter("foo") ? parameter("foo") : "default")</argument>
       </call>
     </service>
     <service id="method_call2" class="FooClass">

src/Symfony/Component/DependencyInjection/Tests/Fixtures/xml/services9.xml

@@ -54,7 +54,7 @@
         <argument type="service" id="foobaz" on-invalid="ignore"/>
       </call>
       <call method="setBar">
-        <argument type="expression">service("foo").foo() ~ parameter("foo")</argument>
+        <argument type="expression">service("foo").foo() ~ (container.hasparameter("foo") ? parameter("foo") : "default")</argument>
       </call>
     </service>
     <service id="factory_service" class="Bar" factory-method="getInstance" factory-service="foo.baz"/>

src/Symfony/Component/DependencyInjection/Tests/Fixtures/yaml/services6.yml

@@ -15,7 +15,7 @@ services:
         calls:
             - [ setBar, [] ]
             - [ setBar ]
-            - [ setBar, ['@=service("foo").foo() ~ parameter("foo")'] ]
+            - [ setBar, ['@=service("foo").foo() ~ (container.hasparameter("foo") ? parameter("foo") : "default")'] ]
     method_call2:
         class: FooClass
         calls:

src/Symfony/Component/DependencyInjection/Tests/Fixtures/yaml/services9.yml

@@ -38,7 +38,7 @@ services:
             - [setBar, ['@?foo2']]
             - [setBar, ['@?foo3']]
             - [setBar, ['@?foobaz']]
-            - [setBar, ['@=service("foo").foo() ~ parameter("foo")']]
+            - [setBar, ['@=service("foo").foo() ~ (container.hasparameter("foo") ? parameter("foo") : "default")']]
 
     factory_service:
         class: Bar

src/Symfony/Component/DependencyInjection/Tests/Loader/XmlFileLoaderTest.php

@@ -210,7 +210,7 @@ class XmlFileLoaderTest extends \PHPUnit_Framework_TestCase
         $this->assertEquals('sc_configure', $services['configurator1']->getConfigurator(), '->load() parses the configurator tag');
         $this->assertEquals(array(new Reference('baz', ContainerInterface::EXCEPTION_ON_INVALID_REFERENCE, false), 'configure'), $services['configurator2']->getConfigurator(), '->load() parses the configurator tag');
         $this->assertEquals(array('BazClass', 'configureStatic'), $services['configurator3']->getConfigurator(), '->load() parses the configurator tag');
-        $this->assertEquals(array(array('setBar', array()), array('setBar', array(new Expression('service("foo").foo() ~ parameter("foo")')))), $services['method_call1']->getMethodCalls(), '->load() parses the method_call tag');
+        $this->assertEquals(array(array('setBar', array()), array('setBar', array(new Expression('service("foo").foo() ~ (container.hasparameter("foo") ? parameter("foo") : "default")')))), $services['method_call1']->getMethodCalls(), '->load() parses the method_call tag');
         $this->assertEquals(array(array('setBar', array('foo', new Reference('foo'), array(true, false)))), $services['method_call2']->getMethodCalls(), '->load() parses the method_call tag');
         $this->assertNull($services['factory_service']->getClass());
         $this->assertEquals('getInstance', $services['factory_service']->getFactoryMethod());

src/Symfony/Component/DependencyInjection/Tests/Loader/YamlFileLoaderTest.php

@@ -138,7 +138,7 @@ class YamlFileLoaderTest extends \PHPUnit_Framework_TestCase
         $this->assertEquals('sc_configure', $services['configurator1']->getConfigurator(), '->load() parses the configurator tag');
         $this->assertEquals(array(new Reference('baz'), 'configure'), $services['configurator2']->getConfigurator(), '->load() parses the configurator tag');
         $this->assertEquals(array('BazClass', 'configureStatic'), $services['configurator3']->getConfigurator(), '->load() parses the configurator tag');
-        $this->assertEquals(array(array('setBar', array()), array('setBar', array()), array('setBar', array(new Expression('service("foo").foo() ~ parameter("foo")')))), $services['method_call1']->getMethodCalls(), '->load() parses the method_call tag');
+        $this->assertEquals(array(array('setBar', array()), array('setBar', array()), array('setBar', array(new Expression('service("foo").foo() ~ (container.hasparameter("foo") ? parameter("foo") : "default")')))), $services['method_call1']->getMethodCalls(), '->load() parses the method_call tag');
         $this->assertEquals(array(array('setBar', array('foo', new Reference('foo'), array(true, false)))), $services['method_call2']->getMethodCalls(), '->load() parses the method_call tag');
         $this->assertEquals('baz_factory', $services['factory_service']->getFactoryService());
 

src/Symfony/Component/ExpressionLanguage/Parser.php

@@ -75,6 +75,16 @@ class Parser
     /**
      * Converts a token stream to a node tree.
      *
+     * The valid names is an array where the values
+     * are the names that the user can use in an expression.
+     *
+     * If the variable name in the compiled PHP code must be
+     * different, define it as the key.
+     *
+     * For instance, ['this' => 'container'] means that the
+     * variable 'container' can be used in the expression
+     * but the compiled code will use 'this'.
+     *
      * @param TokenStream $stream A token stream instance
      * @param array       $names  An array of valid names
      *
@@ -194,7 +204,13 @@ class Parser
                                 throw new SyntaxError(sprintf('Variable "%s" is not valid', $token->value), $token->cursor);
                             }
 
-                            $node = new Node\NameNode($token->value);
+                            // is the name used in the compiled code different
+                            // from the name used in the expression?
+                            if (is_int($name = array_search($token->value, $this->names))) {
+                                $name = $token->value;
+                            }
+
+                            $node = new Node\NameNode($name);
                         }
                 }
                 break;

src/Symfony/Component/ExpressionLanguage/Tests/ParserTest.php

@@ -148,6 +148,12 @@ class ParserTest extends \PHPUnit_Framework_TestCase
                 'foo.bar().foo().baz[3]',
                 array('foo'),
             ),
+
+            array(
+                new Node\NameNode('foo'),
+                'bar',
+                array('foo' => 'bar'),
+            ),
         );
     }