| /* |
| * Copyright 2015 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_CSS_RULE_VISITOR_H_ |
| #define COBALT_CSSOM_CSS_RULE_VISITOR_H_ |
| |
| namespace cobalt { |
| namespace cssom { |
| |
| class CSSStyleRule; |
| class CSSMediaRule; |
| class CSSFontFaceRule; |
| class CSSKeyframeRule; |
| class CSSKeyframesRule; |
| |
| // 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 CSSRuleVisitor { |
| public: |
| // Simple selectors. |
| virtual void VisitCSSStyleRule(CSSStyleRule* css_style_rule) = 0; |
| virtual void VisitCSSFontFaceRule(CSSFontFaceRule* css_font_face_rule) = 0; |
| virtual void VisitCSSMediaRule(CSSMediaRule* css_media_rule) = 0; |
| virtual void VisitCSSKeyframeRule(CSSKeyframeRule* css_keyframe_rule) = 0; |
| virtual void VisitCSSKeyframesRule(CSSKeyframesRule* css_keyframes_rule) = 0; |
| |
| protected: |
| ~CSSRuleVisitor() {} |
| }; |
| |
| } // namespace cssom |
| } // namespace cobalt |
| |
| #endif // COBALT_CSSOM_CSS_RULE_VISITOR_H_ |