| /* |
| * Copyright 2014 Google Inc. All Rights Reserved. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef COBALT_CSSOM_SELECTOR_VISITOR_H_ |
| #define COBALT_CSSOM_SELECTOR_VISITOR_H_ |
| |
| namespace cobalt { |
| namespace cssom { |
| |
| class ActivePseudoClass; |
| class AfterPseudoElement; |
| class BeforePseudoElement; |
| class ClassSelector; |
| class ComplexSelector; |
| class CompoundSelector; |
| class EmptyPseudoClass; |
| class FocusPseudoClass; |
| class HoverPseudoClass; |
| class IdSelector; |
| class NotPseudoClass; |
| class TypeSelector; |
| class UniversalSelector; |
| |
| // Type-safe branching on a class hierarchy of CSS selectors, |
| // implemented after a classical GoF pattern (see |
| // http://en.wikipedia.org/wiki/Visitor_pattern#Java_example). |
| class SelectorVisitor { |
| public: |
| // Simple selectors. |
| |
| virtual void VisitUniversalSelector( |
| UniversalSelector* universal_selector) = 0; |
| virtual void VisitTypeSelector(TypeSelector* type_selector) = 0; |
| virtual void VisitClassSelector(ClassSelector* class_selector) = 0; |
| virtual void VisitIdSelector(IdSelector* id_selector) = 0; |
| |
| // Pseudo classes. |
| virtual void VisitActivePseudoClass( |
| ActivePseudoClass* active_pseudo_class) = 0; |
| virtual void VisitEmptyPseudoClass(EmptyPseudoClass* empty_pseudo_class) = 0; |
| virtual void VisitFocusPseudoClass(FocusPseudoClass* focus_pseudo_class) = 0; |
| virtual void VisitHoverPseudoClass(HoverPseudoClass* hover_pseudo_class) = 0; |
| virtual void VisitNotPseudoClass(NotPseudoClass* not_pseudo_class) = 0; |
| |
| // Pseudo elements. |
| virtual void VisitAfterPseudoElement( |
| AfterPseudoElement* after_pseudo_element) = 0; |
| virtual void VisitBeforePseudoElement( |
| BeforePseudoElement* before_pseudo_element) = 0; |
| |
| // Compound selector. |
| |
| virtual void VisitCompoundSelector(CompoundSelector* compound_selector) = 0; |
| |
| // Complex selector. |
| |
| virtual void VisitComplexSelector(ComplexSelector* complex_selector) = 0; |
| |
| protected: |
| ~SelectorVisitor() {} |
| }; |
| |
| } // namespace cssom |
| } // namespace cobalt |
| |
| #endif // COBALT_CSSOM_SELECTOR_VISITOR_H_ |