Basic implementation of @apply

third_party/WebKit/Source/core/css/resolver/CSSVariableResolver.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CSSVariableResolver_h
 #define CSSVariableResolver_h
 
 #include "core/CSSPropertyNames.h"
 #include "core/css/parser/CSSParserToken.h"
 #include "wtf/HashSet.h"
@@ skipping 14 matching lines @@
     static void resolveAndApplyVariableReferences(StyleResolverState&, CSSPropertyID, const CSSVariableReferenceValue&);
 
     // Shorthand properties are not supported.
     static PassRefPtrWillBeRawPtr<CSSValue> resolveVariableReferences(StyleVariableData*, CSSPropertyID, const CSSVariableReferenceValue&);
 
 private:
     CSSVariableResolver(StyleVariableData*);
 
     // These return false if we encounter a reference to an invalid variable with no fallback
 
-    // Resolves a range which may contain var() references
+    // Resolves a range which may contain var() references or @apply rules
     bool resolveTokenRange(CSSParserTokenRange, Vector<CSSParserToken>& result);
     // Resolves the fallback (if present) of a var() reference, starting from the comma
     bool resolveFallback(CSSParserTokenRange, Vector<CSSParserToken>& result);
     // Resolves the contents of a var() reference
     bool resolveVariableReference(CSSParserTokenRange, Vector<CSSParserToken>& result);
+    // Consumes and resolves an @apply rule
+    void resolveApplyAtRule(CSSParserTokenRange&, Vector<CSSParserToken>& result);
 
     // These return null if the custom property is invalid
 
     // Returns the CSSVariableData for a custom property, resolving and storing it if necessary
     CSSVariableData* valueForCustomProperty(AtomicString name);
     // Resolves the CSSVariableData from a custom property declaration
     PassRefPtr<CSSVariableData> resolveCustomProperty(AtomicString name, const CSSVariableData&);
 
     StyleVariableData* m_styleVariableData;
     HashSet<AtomicString> m_variablesSeen;
     // Resolution doesn't finish when a cycle is detected. Fallbacks still
     // need to be tracked for additional cycles, and invalidation only
     // applies back to cycle starts.
     HashSet<AtomicString> m_cycleStartPoints;
 };
 
 } // namespace blink
 
 #endif // CSSVariableResolver