Page Speed Optimization Libraries  1.2.24.1
net/instaweb/rewriter/public/css_minify.h
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00001 /*
00002  * Copyright 2010 Google Inc.
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *      http:///www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00018 
00019 #ifndef NET_INSTAWEB_REWRITER_PUBLIC_CSS_MINIFY_H_
00020 #define NET_INSTAWEB_REWRITER_PUBLIC_CSS_MINIFY_H_
00021 
00022 #include "net/instaweb/util/public/basictypes.h"
00023 #include "net/instaweb/util/public/string.h"
00024 #include "net/instaweb/util/public/string_util.h"
00025 
00026 namespace Css {
00027 class Stylesheet;
00028 class Charsets;
00029 class Import;
00030 class MediaQuery;
00031 class MediaQueries;
00032 class MediaExpression;
00033 class Ruleset;
00034 class Selector;
00035 class SimpleSelector;
00036 class SimpleSelectors;
00037 class Declaration;
00038 class Declarations;
00039 class Value;
00040 class FunctionParameters;
00041 class UnparsedRegion;
00042 }
00043 
00044 class UnicodeText;
00045 
00046 namespace net_instaweb {
00047 
00048 class GoogleUrl;
00049 class RewriteDriver;
00050 class MessageHandler;
00051 class Writer;
00052 
00053 class CssMinify {
00054  public:
00056   static bool Stylesheet(const Css::Stylesheet& stylesheet,
00057                          Writer* writer,
00058                          MessageHandler* handler);
00059 
00061   static bool Declarations(const Css::Declarations& declarations,
00062                            Writer* writer,
00063                            MessageHandler* handler);
00064 
00068   static bool AbsolutifyImports(Css::Stylesheet* stylesheet,
00069                                 const GoogleUrl& base);
00070 
00076   static bool AbsolutifyUrls(Css::Stylesheet* stylesheet,
00077                              const GoogleUrl& base,
00078                              bool handle_parseable_sections,
00079                              bool handle_unparseable_sections,
00080                              RewriteDriver* driver,
00081                              MessageHandler* handler);
00082 
00083  private:
00084   CssMinify(Writer* writer, MessageHandler* handler);
00085   ~CssMinify();
00086 
00087   void Write(const StringPiece& str);
00088   void WriteURL(const UnicodeText& url);
00089 
00090   template<typename Container>
00091   void JoinMinify(const Container& container, const StringPiece& sep);
00092   template<typename Iterator>
00093   void JoinMinifyIter(const Iterator& begin, const Iterator& end,
00094                       const StringPiece& sep);
00095 
00098   void Minify(const Css::Stylesheet& stylesheet);
00099   void Minify(const Css::Charsets& charsets);
00100   void Minify(const Css::Import& import);
00101   void Minify(const Css::MediaQuery& media_query);
00102   void Minify(const Css::MediaExpression& expression);
00103   void Minify(const Css::Selector& selector);
00104   void Minify(const Css::SimpleSelectors& sselectors, bool isfirst = false);
00105   void Minify(const Css::SimpleSelector& sselector);
00106   void Minify(const Css::Declaration& declaration);
00107   void Minify(const Css::Value& value);
00108   void Minify(const Css::FunctionParameters& parameters);
00109   void Minify(const Css::UnparsedRegion& unparsed_region);
00110 
00114 
00117   void MinifyRulesetIgnoringMedia(const Css::Ruleset& ruleset);
00119   void MinifyRulesetMediaStart(const Css::Ruleset& ruleset);
00121   void MinifyRulesetMediaEnd(const Css::Ruleset& ruleset);
00122 
00123   bool Equals(const Css::MediaQueries& a, const Css::MediaQueries& b) const;
00124   bool Equals(const Css::MediaQuery& a, const Css::MediaQuery& b) const;
00125   bool Equals(const Css::MediaExpression& a,
00126               const Css::MediaExpression& b) const;
00127 
00128   Writer* writer_;
00129   MessageHandler* handler_;
00130   bool ok_;
00131 
00132   DISALLOW_COPY_AND_ASSIGN(CssMinify);
00133 };
00134 
00135 }  
00136 
00137 #endif  ///< NET_INSTAWEB_REWRITER_PUBLIC_CSS_MINIFY_H_
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