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/*
* 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_