symfony · fabpot · Mar 6, 2017 · Feb 20, 2017
diff --git a/UPGRADE-3.3.md b/UPGRADE-3.3.md
@@ -246,6 +246,37 @@ Workflow
 Yaml
 ----
 
+ * Deprecated support for implicitly parsing non-string mapping keys as strings. Mapping keys that are no strings will
+   lead to a `ParseException` in Symfony 4.0. Use the `PARSE_KEYS_AS_STRINGS` flag to opt-in for keys to be parsed as
+   strings.
+
+   Before:
+
+   ```php
+   $yaml = <<<YAML
+   null: null key
+   true: boolean true
+   1: integer key
+   2.0: float key
+   YAML;
+
+   Yaml::parse($yaml);
+   ```
+
+   After:
+
+   ```php
+
+   $yaml = <<<YAML
+   null: null key
+   true: boolean true
+   1: integer key
+   2.0: float key
+   YAML;
+
+   Yaml::parse($yaml, Yaml::PARSE_KEYS_AS_STRINGS);
+   ```
+
  * Omitting the key of a mapping is deprecated and will throw a `ParseException` in Symfony 4.0.
 
  * The constructor arguments `$offset`, `$totalNumberOfLines` and

diff --git a/UPGRADE-4.0.md b/UPGRADE-4.0.md
@@ -463,6 +463,36 @@ Workflow
 Yaml
 ----
 
+ * Removed support for implicitly parsing non-string mapping keys as strings. Mapping keys that are no strings will
+   result in a `ParseException`. Use the `PARSE_KEYS_AS_STRINGS` flag to opt-in for keys to be parsed as strings.
+
+   Before:
+
+   ```php
+   $yaml = <<<YAML
+   null: null key
+   true: boolean true
+   1: integer key
+   2.0: float key
+   YAML;
+
+   Yaml::parse($yaml);
+   ```
+
+   After:
+
+   ```php
+
+   $yaml = <<<YAML
+   null: null key
+   true: boolean true
+   1: integer key
+   2.0: float key
+   YAML;
+
+   Yaml::parse($yaml, Yaml::PARSE_KEYS_AS_STRINGS);
+   ```
+
  * Omitting the key of a mapping is not supported anymore and throws a `ParseException`.
 
  * Mappings with a colon (`:`) that is not followed by a whitespace are not

diff --git a/src/Symfony/Component/DependencyInjection/Loader/YamlFileLoader.php b/src/Symfony/Component/DependencyInjection/Loader/YamlFileLoader.php
@@ -602,7 +602,7 @@ protected function loadFile($file)
         }
 
         try {
-            $configuration = $this->yamlParser->parse(file_get_contents($file), Yaml::PARSE_CONSTANT | Yaml::PARSE_CUSTOM_TAGS);
+            $configuration = $this->yamlParser->parse(file_get_contents($file), Yaml::PARSE_CONSTANT | Yaml::PARSE_CUSTOM_TAGS | Yaml::PARSE_KEYS_AS_STRINGS);
         } catch (ParseException $e) {
             throw new InvalidArgumentException(sprintf('The file "%s" does not contain valid YAML.', $file), 0, $e);
         }

diff --git a/src/Symfony/Component/Routing/Loader/YamlFileLoader.php b/src/Symfony/Component/Routing/Loader/YamlFileLoader.php
@@ -17,6 +17,7 @@
 use Symfony\Component\Yaml\Exception\ParseException;
 use Symfony\Component\Yaml\Parser as YamlParser;
 use Symfony\Component\Config\Loader\FileLoader;
+use Symfony\Component\Yaml\Yaml;
 
 /**
  * YamlFileLoader loads Yaml routing files.
@@ -58,7 +59,7 @@ public function load($file, $type = null)
         }
 
         try {
-            $parsedConfig = $this->yamlParser->parse(file_get_contents($path));
+            $parsedConfig = $this->yamlParser->parse(file_get_contents($path), Yaml::PARSE_KEYS_AS_STRINGS);
         } catch (ParseException $e) {
             throw new \InvalidArgumentException(sprintf('The file "%s" does not contain valid YAML.', $path), 0, $e);
         }

diff --git a/src/Symfony/Component/Routing/composer.json b/src/Symfony/Component/Routing/composer.json
@@ -21,15 +21,16 @@
     "require-dev": {
         "symfony/config": "~2.8|~3.0",
         "symfony/http-foundation": "~2.8|~3.0",
-        "symfony/yaml": "~2.8|~3.0",
+        "symfony/yaml": "~3.3",
         "symfony/expression-language": "~2.8|~3.0",
         "symfony/dependency-injection": "~2.8|~3.0",
         "doctrine/annotations": "~1.0",
         "doctrine/common": "~2.2",
         "psr/log": "~1.0"
     },
     "conflict": {
-        "symfony/config": "<2.8"
+        "symfony/config": "<2.8",
+        "symfony/yaml": "<3.3"
     },
     "suggest": {
         "symfony/http-foundation": "For using a Symfony Request object",

diff --git a/src/Symfony/Component/Serializer/Mapping/Loader/YamlFileLoader.php b/src/Symfony/Component/Serializer/Mapping/Loader/YamlFileLoader.php
@@ -15,6 +15,7 @@
 use Symfony\Component\Serializer\Mapping\AttributeMetadata;
 use Symfony\Component\Serializer\Mapping\ClassMetadataInterface;
 use Symfony\Component\Yaml\Parser;
+use Symfony\Component\Yaml\Yaml;
 
 /**
  * YAML File Loader.
@@ -113,7 +114,7 @@ private function getClassesFromYaml()
             $this->yamlParser = new Parser();
         }
 
-        $classes = $this->yamlParser->parse(file_get_contents($this->file));
+        $classes = $this->yamlParser->parse(file_get_contents($this->file), Yaml::PARSE_KEYS_AS_STRINGS);
 
         if (empty($classes)) {
             return array();

diff --git a/src/Symfony/Component/Serializer/composer.json b/src/Symfony/Component/Serializer/composer.json
@@ -19,7 +19,7 @@
         "php": ">=5.5.9"
     },
     "require-dev": {
-        "symfony/yaml": "~3.1",
+        "symfony/yaml": "~3.3",
         "symfony/config": "~2.8|~3.0",
         "symfony/property-access": "~2.8|~3.0",
         "symfony/http-foundation": "~2.8|~3.0",
@@ -34,7 +34,7 @@
         "symfony/dependency-injection": "<3.2",
         "symfony/property-access": ">=3.0,<3.0.4|>=2.8,<2.8.4",
         "symfony/property-info": "<3.1",
-        "symfony/yaml": "<3.1"
+        "symfony/yaml": "<3.3"
     },
     "suggest": {
         "psr/cache-implementation": "For using the metadata cache.",

diff --git a/src/Symfony/Component/Translation/Loader/YamlFileLoader.php b/src/Symfony/Component/Translation/Loader/YamlFileLoader.php
@@ -15,6 +15,7 @@
 use Symfony\Component\Translation\Exception\LogicException;
 use Symfony\Component\Yaml\Parser as YamlParser;
 use Symfony\Component\Yaml\Exception\ParseException;
+use Symfony\Component\Yaml\Yaml;
 
 /**
  * YamlFileLoader loads translations from Yaml files.
@@ -39,7 +40,7 @@ protected function loadResource($resource)
         }
 
         try {
-            $messages = $this->yamlParser->parse(file_get_contents($resource));
+            $messages = $this->yamlParser->parse(file_get_contents($resource), Yaml::PARSE_KEYS_AS_STRINGS);
         } catch (ParseException $e) {
             throw new InvalidResourceException(sprintf('Error parsing YAML, invalid file "%s"', $resource), 0, $e);
         }

diff --git a/src/Symfony/Component/Translation/composer.json b/src/Symfony/Component/Translation/composer.json
@@ -22,11 +22,12 @@
     "require-dev": {
         "symfony/config": "~2.8|~3.0",
         "symfony/intl": "^2.8.18|^3.2.5",
-        "symfony/yaml": "~2.8|~3.0",
+        "symfony/yaml": "~3.3",
         "psr/log": "~1.0"
     },
     "conflict": {
-        "symfony/config": "<2.8"
+        "symfony/config": "<2.8",
+        "symfony/yaml": "<3.3"
     },
     "suggest": {
         "symfony/config": "",

diff --git a/src/Symfony/Component/Validator/Mapping/Loader/YamlFileLoader.php b/src/Symfony/Component/Validator/Mapping/Loader/YamlFileLoader.php
@@ -14,6 +14,7 @@
 use Symfony\Component\Validator\Mapping\ClassMetadata;
 use Symfony\Component\Yaml\Exception\ParseException;
 use Symfony\Component\Yaml\Parser as YamlParser;
+use Symfony\Component\Yaml\Yaml;
 
 /**
  * Loads validation metadata from a YAML file.
@@ -115,7 +116,7 @@ protected function parseNodes(array $nodes)
     private function parseFile($path)
     {
         try {
-            $classes = $this->yamlParser->parse(file_get_contents($path));
+            $classes = $this->yamlParser->parse(file_get_contents($path), Yaml::PARSE_KEYS_AS_STRINGS);
         } catch (ParseException $e) {
             throw new \InvalidArgumentException(sprintf('The file "%s" does not contain valid YAML.', $path), 0, $e);
         }

diff --git a/src/Symfony/Component/Validator/composer.json b/src/Symfony/Component/Validator/composer.json
@@ -23,7 +23,7 @@
     "require-dev": {
         "symfony/http-foundation": "~2.8|~3.0",
         "symfony/intl": "^2.8.18|^3.2.5",
-        "symfony/yaml": "~2.8|~3.0",
+        "symfony/yaml": "~3.3",
         "symfony/config": "~2.8|~3.0",
         "symfony/expression-language": "~2.8|~3.0",
         "symfony/cache": "~3.1",
@@ -32,7 +32,8 @@
         "egulias/email-validator": "^1.2.8|~2.0"
     },
     "conflict": {
-        "phpunit/phpunit": "<4.8.35|<5.4.3,>=5.0"
+        "phpunit/phpunit": "<4.8.35|<5.4.3,>=5.0",
+        "symfony/yaml": "<3.3"
     },
     "suggest": {
         "psr/cache-implementation": "For using the metadata cache.",

diff --git a/src/Symfony/Component/Yaml/CHANGELOG.md b/src/Symfony/Component/Yaml/CHANGELOG.md
@@ -4,6 +4,37 @@ CHANGELOG
 3.3.0
 -----
 
+ * Deprecated support for implicitly parsing non-string mapping keys as strings. Mapping keys that are no strings will
+   lead to a `ParseException` in Symfony 4.0. Use the `PARSE_KEYS_AS_STRINGS` flag to opt-in for keys to be parsed as
+   strings.
+
+   Before:
+
+   ```php
+   $yaml = <<<YAML
+   null: null key
+   true: boolean true
+   1: integer key
+   2.0: float key
+   YAML;
+
+   Yaml::parse($yaml);
+   ```
+
+   After:
+
+   ```php
+
+   $yaml = <<<YAML
+   null: null key
+   true: boolean true
+   1: integer key
+   2.0: float key
+   YAML;
+
+   Yaml::parse($yaml, Yaml::PARSE_KEYS_AS_STRINGS);
+   ```
+
  * Omitted mapping values will be parsed as `null`.
 
  * Omitting the key of a mapping is deprecated and will throw a `ParseException` in Symfony 4.0.

diff --git a/src/Symfony/Component/Yaml/Inline.php b/src/Symfony/Component/Yaml/Inline.php
@@ -485,6 +485,14 @@ private static function parseMapping($mapping, $flags, &$i = 0, $references = ar
                 @trigger_error('Omitting the key of a mapping is deprecated and will throw a ParseException in 4.0.', E_USER_DEPRECATED);
             }
 
+            if (!(Yaml::PARSE_KEYS_AS_STRINGS & $flags)) {
+                $evaluatedKey = self::evaluateScalar($key, $flags, $references);
+
+                if ('' !== $key && $evaluatedKey !== $key && !is_string($evaluatedKey)) {
+                    @trigger_error('Implicit casting of incompatible mapping keys to strings is deprecated since version 3.3 and will throw \Symfony\Component\Yaml\Exception\ParseException in 4.0. Pass the PARSE_KEYS_AS_STRING flag to explicitly enable the type casts.', E_USER_DEPRECATED);
+                }
+            }
+
             if (':' !== $key && (!isset($mapping[$i + 1]) || !in_array($mapping[$i + 1], array(' ', ',', '[', ']', '{', '}'), true))) {
                 @trigger_error('Using a colon that is not followed by an indication character (i.e. " ", ",", "[", "]", "{", "}" is deprecated since version 3.2 and will throw a ParseException in 4.0.', E_USER_DEPRECATED);
             }

diff --git a/src/Symfony/Component/Yaml/Parser.php b/src/Symfony/Component/Yaml/Parser.php
@@ -180,14 +180,19 @@ public function parse($value, $flags = 0)
                 Inline::parse(null, $flags, $this->refs);
                 try {
                     Inline::$parsedLineNumber = $this->getRealCurrentLineNb();
-                    $key = Inline::parseScalar($values['key']);
+                    $i = 0;
+                    $key = Inline::parseScalar($values['key'], 0, null, $i, !(Yaml::PARSE_KEYS_AS_STRINGS & $flags));
                 } catch (ParseException $e) {
                     $e->setParsedLine($this->getRealCurrentLineNb() + 1);
                     $e->setSnippet($this->currentLine);
 
                     throw $e;
                 }
 
+                if (!(Yaml::PARSE_KEYS_AS_STRINGS & $flags) && !is_string($key)) {
+                    @trigger_error('Implicit casting of incompatible mapping keys to strings is deprecated since version 3.3 and will throw \Symfony\Component\Yaml\Exception\ParseException in 4.0. Pass the PARSE_KEYS_AS_STRING flag to explicitly enable the type casts.', E_USER_DEPRECATED);
+                }
+
                 // Convert float keys to strings, to avoid being converted to integers by PHP
                 if (is_float($key)) {
                     $key = (string) $key;

diff --git a/src/Symfony/Component/Yaml/Tests/DumperTest.php b/src/Symfony/Component/Yaml/Tests/DumperTest.php
@@ -125,7 +125,7 @@ public function testSpecifications()
                     // TODO
                 } else {
                     eval('$expected = '.trim($test['php']).';');
-                    $this->assertSame($expected, $this->parser->parse($this->dumper->dump($expected, 10)), $test['test']);
+                    $this->assertSame($expected, $this->parser->parse($this->dumper->dump($expected, 10), Yaml::PARSE_KEYS_AS_STRINGS), $test['test']);
                 }
             }
         }

diff --git a/src/Symfony/Component/Yaml/Tests/Fixtures/YtsSpecificationExamples.yml b/src/Symfony/Component/Yaml/Tests/Fixtures/YtsSpecificationExamples.yml
@@ -556,21 +556,6 @@ php: |
     'fixed' => 1230.15,
   )
 ---
-test: Miscellaneous
-spec: 2.21
-yaml: |
-  null: ~
-  true: true
-  false: false
-  string: '12345'
-php: |
-  array(
-    '' => null,
-    1 => true,
-    0 => false,
-    'string' => '12345'
-  )
----
 test: Timestamps
 todo: true
 spec: 2.22
@@ -1533,18 +1518,6 @@ ruby: |
   }
 
 ---
-test: Boolean
-yaml: |
-   false: used as key
-   logical:  true
-   answer: false
-php: |
-   array(
-     false => 'used as key',
-     'logical' => true,
-     'answer' => false
-   )
----
 test: Integer
 yaml: |
    canonical: 12345

diff --git a/src/Symfony/Component/Yaml/Tests/Fixtures/YtsTypeTransfers.yml b/src/Symfony/Component/Yaml/Tests/Fixtures/YtsTypeTransfers.yml
@@ -210,20 +210,6 @@ php: |
       'negative one-thousand' => -1000.0
     )
 ---
-test: Integers as Map Keys
-brief: >
-    An integer can be used a dictionary key.
-yaml: |
-    1: one
-    2: two
-    3: three
-php: |
-    array(
-        1 => 'one',
-        2 => 'two',
-        3 => 'three'
-    )
----
 test: Floats
 dump_skip: true
 brief: >

diff --git a/src/Symfony/Component/Yaml/Tests/Fixtures/booleanMappingKeys.yml b/src/Symfony/Component/Yaml/Tests/Fixtures/booleanMappingKeys.yml
@@ -0,0 +1,11 @@
+--- %YAML:1.0
+test: Miscellaneous
+spec: 2.21
+yaml: |
+  true: true
+  false: false
+php: |
+  array(
+    'true' => true,
+    'false' => false,
+  )