bug #26450 [CssSelector] Fix CSS identifiers parsing - they can start…

… with dash (jakubkulhan)

This PR was merged into the 2.7 branch.

Discussion
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[CssSelector] Fix CSS identifiers parsing - they can start with dash

| Q             | A
| ------------- | ---
| Branch?       | 2.7
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| License       | MIT

Vendor prefixes use `-` (dash) at the start of CSS identifiers.

Commits
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16e86bc [CssSelector] Fix CSS identifiers parsing - they can start with dash

src/Symfony/Component/CssSelector/Parser/Tokenizer/TokenizerPatterns.php

@@ -44,7 +44,7 @@ public function __construct()
         $this->nonAsciiPattern = '[^\x00-\x7F]';
         $this->nmCharPattern = '[_a-z0-9-]|'.$this->escapePattern.'|'.$this->nonAsciiPattern;
         $this->nmStartPattern = '[_a-z]|'.$this->escapePattern.'|'.$this->nonAsciiPattern;
-        $this->identifierPattern = '(?:'.$this->nmStartPattern.')(?:'.$this->nmCharPattern.')*';
+        $this->identifierPattern = '-?(?:'.$this->nmStartPattern.')(?:'.$this->nmCharPattern.')*';
         $this->hashPattern = '#((?:'.$this->nmCharPattern.')+)';
         $this->numberPattern = '[+-]?(?:[0-9]*\.[0-9]+|[0-9]+)';
         $this->quotedStringPattern = '([^\n\r\f%s]|'.$this->stringEscapePattern.')*';

src/Symfony/Component/CssSelector/Tests/Parser/ParserTest.php

@@ -186,6 +186,7 @@ public function getPseudoElementsTestData()
             array('foo:after', 'Element[foo]', 'after'),
             array('foo::selection', 'Element[foo]', 'selection'),
             array('lorem#ipsum ~ a#b.c[href]:empty::selection', 'CombinedSelector[Hash[Element[lorem]#ipsum] ~ Pseudo[Attribute[Class[Hash[Element[a]#b].c][href]]:empty]]', 'selection'),
+            array('video::-webkit-media-controls', 'Element[video]', '-webkit-media-controls'),
         );
     }