Add Symfony Yaml PHP constants support integration (#829)

fixtures/Parser/files/yaml/constants.yml

@@ -0,0 +1,12 @@
+#
+# This file is part of the Alice package.
+#
+# (c) Nelmio <hello@nelm.io>
+#
+# For the full copyright and license information, please view the LICENSE
+# file that was distributed with this source code.
+#
+
+Nelmio\Alice\Model\User:
+    user0:
+        max_int: !php/const:PHP_INT_MAX

src/Parser/Chainable/YamlParser.php

@@ -20,6 +20,7 @@
 use Nelmio\Alice\Throwable\Exception\Parser\ParseExceptionFactory;
 use Symfony\Component\Yaml\Exception\ParseException as SymfonyParseException;
 use Symfony\Component\Yaml\Parser as SymfonyYamlParser;
+use Symfony\Component\Yaml\Yaml;
 
 final class YamlParser implements ChainableParserInterface
 {
@@ -64,7 +65,9 @@ public function parse(string $file): array
         }
 
         try {
-            $data = $this->yamlParser->parse(file_get_contents($file));
+            $data = defined('Symfony\\Component\\Yaml\\Yaml::PARSE_CONSTANT')
+                ? $this->yamlParser->parse(file_get_contents($file), Yaml::PARSE_CONSTANT)
+                : $this->yamlParser->parse(file_get_contents($file));
 
             // $data is null only if the YAML file was empty; otherwise an exception is thrown
             return (null === $data) ? [] : $data;

tests/Parser/Chainable/YamlParserTest.php

@@ -21,6 +21,7 @@
 use ReflectionClass;
 use Symfony\Component\Yaml\Exception\ParseException as SymfonyParseException;
 use Symfony\Component\Yaml\Parser as SymfonyYamlParser;
+use Symfony\Component\Yaml\Yaml;
 
 /**
  * @covers \Nelmio\Alice\Parser\Chainable\YamlParser
@@ -141,7 +142,11 @@ public function testUseSymfonyParserToParseFile()
         $expected = [new \stdClass()];
 
         $symfonyYamlParserProphecy = $this->prophesize(SymfonyYamlParser::class);
-        $symfonyYamlParserProphecy->parse($fileContent)->willReturn($expected);
+        if (defined('Symfony\\Component\\Yaml\\Yaml::PARSE_CONSTANT')) {
+            $symfonyYamlParserProphecy->parse($fileContent, Yaml::PARSE_CONSTANT)->willReturn($expected);
+        } else {
+            $symfonyYamlParserProphecy->parse($fileContent)->willReturn($expected);
+        }
         /* @var SymfonyYamlParser $symfonyYamlParser */
         $symfonyYamlParser = $symfonyYamlParserProphecy->reveal();
 
@@ -150,7 +155,7 @@ public function testUseSymfonyParserToParseFile()
 
         $this->assertSame($expected, $actual);
 
-        $symfonyYamlParserProphecy->parse(Argument::any())->shouldBeCalledTimes(1);
+        $symfonyYamlParserProphecy->parse(Argument::cetera())->shouldBeCalledTimes(1);
     }
 
     public function testReturnsParsedFileContent()
@@ -172,6 +177,28 @@ public function testReturnsParsedFileContent()
         );
     }
 
+    public function testParseReturnsInterpretedConstants()
+    {
+        if (!defined('Symfony\\Component\\Yaml\\Yaml::PARSE_CONSTANT')) {
+            $this->markTestSkipped('This test needs symfony/yaml v3.2 or higher.');
+        }
+        $symfonyParser = new SymfonyYamlParser();
+
+        $parser = new YamlParser($symfonyParser);
+        $actual = $parser->parse(self::$dir.'/constants.yml');
+
+        $this->assertSame(
+            [
+                'Nelmio\Alice\Model\User' => [
+                    'user0' => [
+                        'max_int' => PHP_INT_MAX,
+                    ],
+                ],
+            ],
+            $actual
+        );
+    }
+
     public function testParsingEmptyFileResultsInEmptySet()
     {
         $symfonyParser = new SymfonyYamlParser();
@@ -188,7 +215,7 @@ public function testThrowsAnExceptionIfFileNotParsable()
             $file = self::$dir.'/basic.yml';
 
             $symfonyYamlParserProphecy = $this->prophesize(SymfonyYamlParser::class);
-            $symfonyYamlParserProphecy->parse(Argument::any())->willThrow(SymfonyParseException::class);
+            $symfonyYamlParserProphecy->parse(Argument::cetera())->willThrow(SymfonyParseException::class);
             /* @var SymfonyYamlParser $symfonyYamlParser */
             $symfonyYamlParser = $symfonyYamlParserProphecy->reveal();