diff --git a/UPGRADE-3.1.md b/UPGRADE-3.1.md
index c2269062e306b..309698eea3742 100644
--- a/UPGRADE-3.1.md
+++ b/UPGRADE-3.1.md
@@ -33,6 +33,8 @@ Serializer
Yaml
----
+ * Deprecated usage of `%` at the beginning of an unquoted string.
+
* The `Dumper::setIndentation()` method is deprecated and will be removed in
Symfony 4.0. Pass the indentation level to the constructor instead.
diff --git a/UPGRADE-4.0.md b/UPGRADE-4.0.md
index 6f92825068601..e2eb6a972bec7 100644
--- a/UPGRADE-4.0.md
+++ b/UPGRADE-4.0.md
@@ -30,6 +30,8 @@ Serializer
Yaml
----
+ * Starting an unquoted string with `%` leads to a `ParseException`.
+
* The `Dumper::setIndentation()` method was removed. Pass the indentation
level to the constructor instead.
diff --git a/src/Symfony/Component/Yaml/CHANGELOG.md b/src/Symfony/Component/Yaml/CHANGELOG.md
index 1ce9f6553ab8a..23b9f6f6b9306 100644
--- a/src/Symfony/Component/Yaml/CHANGELOG.md
+++ b/src/Symfony/Component/Yaml/CHANGELOG.md
@@ -4,6 +4,8 @@ CHANGELOG
3.1.0
-----
+ * Deprecated usage of `%` at the beginning of an unquoted string.
+
* Added support for customizing the YAML parser behavior through an optional bit field:
```php
diff --git a/src/Symfony/Component/Yaml/Inline.php b/src/Symfony/Component/Yaml/Inline.php
index f08a6fa177954..4907e695c1125 100644
--- a/src/Symfony/Component/Yaml/Inline.php
+++ b/src/Symfony/Component/Yaml/Inline.php
@@ -289,6 +289,10 @@ public static function parseScalar($scalar, $delimiters = null, $stringDelimiter
throw new ParseException(sprintf('The reserved indicator "%s" cannot start a plain scalar; you need to quote the scalar.', $output[0]));
}
+ if ($output && '%' === $output[0]) {
+ @trigger_error('Not quoting a scalar starting with the "%" indicator character is deprecated since Symfony 3.1 and will throw a ParseException in 4.0.', E_USER_DEPRECATED);
+ }
+
if ($evaluate) {
$output = self::evaluateScalar($output, $references);
}
diff --git a/src/Symfony/Component/Yaml/Tests/InlineTest.php b/src/Symfony/Component/Yaml/Tests/InlineTest.php
index c6fac119a2df3..c23c78bd998c0 100644
--- a/src/Symfony/Component/Yaml/Tests/InlineTest.php
+++ b/src/Symfony/Component/Yaml/Tests/InlineTest.php
@@ -252,6 +252,27 @@ public function getScalarIndicators()
return array(array('|'), array('>'));
}
+ /**
+ * @group legacy
+ * throws \Symfony\Component\Yaml\Exception\ParseException in 4.0
+ */
+ public function testParseUnquotedScalarStartingWithPercentCharacter()
+ {
+ $deprecations = array();
+ set_error_handler(function ($type, $msg) use (&$deprecations) {
+ if (E_USER_DEPRECATED === $type) {
+ $deprecations[] = $msg;
+ }
+ });
+
+ Inline::parse('{ foo: %foo }');
+
+ restore_error_handler();
+
+ $this->assertCount(1, $deprecations);
+ $this->assertContains('Not quoting a scalar starting with the "%" indicator character is deprecated since Symfony 3.1 and will throw a ParseException in 4.0.', $deprecations[0]);
+ }
+
public function getTestsForParse()
{
return array(
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