expand constants

in nearly every circumstance of this project we will want constants

Processor.php

@@ -31,7 +31,7 @@ public function processFile(array $config)
         $this->io->write(sprintf('<info>%s the "%s" file</info>', $action, $realFile));
 
         // Find the expected params
-        $expectedValues = $yamlParser->parse(file_get_contents($config['dist-file']));
+        $expectedValues = $yamlParser->parse(file_get_contents($config['dist-file']), Yaml::PARSE_CONSTANT);
         if (!isset($expectedValues[$parameterKey])) {
             throw new \InvalidArgumentException(sprintf('The top-level key %s is missing.', $parameterKey));
         }
@@ -44,7 +44,7 @@ public function processFile(array $config)
             array($parameterKey => array())
         );
         if ($exists) {
-            $existingValues = $yamlParser->parse(file_get_contents($realFile));
+            $existingValues = $yamlParser->parse(file_get_contents($realFile), Yaml::PARSE_CONSTANT);
             if ($existingValues === null) {
                 $existingValues = array();
             }

Tests/ProcessorTest.php

@@ -107,7 +107,7 @@ public function testParameterHandling($testCaseName)
                 'environment' => array(),
                 'interactive' => false,
             ),
-            (array) Yaml::parse(file_get_contents($dataDir.'/setup.yml'))
+            (array) Yaml::parse(file_get_contents($dataDir.'/setup.yml'), Yaml::PARSE_CONSTANT)
         );
 
         $workingDir = sys_get_temp_dir() . '/incenteev_parameter_handler';

Tests/fixtures/testcases/parse_constants/dist.yml

@@ -0,0 +1,6 @@
+parameters:
+    transitions:
+        !php/const 'Symfony\Component\Yaml\Tests\B::FOO':
+            from:
+                - !php/const 'Symfony\Component\Yaml\Tests\B::BAR'
+            to: !php/const 'Symfony\Component\Yaml\Tests\B::BAZ'

Tests/fixtures/testcases/parse_constants/existing.yml

@@ -0,0 +1,6 @@
+parameters:
+    transitions:
+        !php/const 'Symfony\Component\Yaml\Tests\B::FOO':
+            from:
+                - !php/const 'Symfony\Component\Yaml\Tests\B::BAR'
+            to: ~

Tests/fixtures/testcases/parse_constants/expected.yml

@@ -0,0 +1,6 @@
+parameters:
+    transitions:
+        foo:
+            from:
+                - bar
+            to: baz

Tests/fixtures/testcases/parse_constants/setup.yml

@@ -0,0 +1 @@
+title: Constants are parsed