Page Speed Optimization Libraries  1.6.29.3
net/instaweb/rewriter/public/css_tag_scanner.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_TAG_SCANNER_H_
00020 #define NET_INSTAWEB_REWRITER_PUBLIC_CSS_TAG_SCANNER_H_
00021 
00022 #include "net/instaweb/htmlparse/public/html_element.h"
00023 #include "net/instaweb/util/public/basictypes.h"
00024 #include "net/instaweb/util/public/string.h"
00025 #include "net/instaweb/util/public/string_util.h"
00026 
00027 namespace net_instaweb {
00028 
00029 class DomainRewriteFilter;
00030 class GoogleUrl;
00031 class HtmlParse;
00032 class MessageHandler;
00033 class RewriteDriver;
00034 class UrlLeftTrimFilter;
00035 class Writer;
00036 
00037 class CssTagScanner {
00038  public:
00041   class Transformer {
00042    public:
00043     virtual ~Transformer();
00044 
00045     enum TransformStatus { kSuccess, kNoChange, kFailure };
00046     virtual TransformStatus Transform(const StringPiece& in,
00047                                       GoogleString* out) = 0;
00048   };
00049 
00050   static const char kStylesheet[];
00051   static const char kAlternate[];
00052   static const char kUriValue[];
00053 
00054   explicit CssTagScanner(HtmlParse* html_parse);
00055 
00060   bool ParseCssElement(HtmlElement* element,
00061                        HtmlElement::Attribute** href,
00062                        const char** media,
00063                        int* num_nonstandard_attributes);
00064 
00067   bool ParseCssElement(HtmlElement* element,
00068                        HtmlElement::Attribute** href,
00069                        const char** media) {
00070     int num_nonstandard_attributes;
00071     return ParseCssElement(element, href, media, &num_nonstandard_attributes);
00072   }
00073 
00078   static bool TransformUrls(
00079       const StringPiece& contents, Writer* writer, Transformer* transformer,
00080       MessageHandler* handler);
00081 
00084   static bool HasImport(const StringPiece& contents, MessageHandler* handler);
00085 
00087   static bool HasUrl(const StringPiece& contents);
00088 
00091   static bool IsStylesheetOrAlternate(const StringPiece& attribute_value);
00092 
00094   static bool IsAlternateStylesheet(const StringPiece& attribute_value);
00095 
00096  private:
00097   DISALLOW_COPY_AND_ASSIGN(CssTagScanner);
00098 };
00099 
00104 class RewriteDomainTransformer : public CssTagScanner::Transformer {
00105  public:
00106   RewriteDomainTransformer(const GoogleUrl* old_base_url,
00107                            const GoogleUrl* new_base_url,
00108                            RewriteDriver* driver);
00109   virtual ~RewriteDomainTransformer();
00110 
00111   virtual TransformStatus Transform(const StringPiece& in, GoogleString* out);
00112 
00113   void set_trim_urls(bool x) { trim_urls_ = x; }
00114 
00115  private:
00116   const GoogleUrl* old_base_url_;
00117   const GoogleUrl* new_base_url_;
00118 
00119   DomainRewriteFilter* domain_rewriter_;
00120   UrlLeftTrimFilter* url_trim_filter_;
00121   MessageHandler* handler_;
00122   bool trim_urls_;
00123   RewriteDriver* driver_;
00124 
00125   DISALLOW_COPY_AND_ASSIGN(RewriteDomainTransformer);
00126 };
00127 
00128 
00129 }  
00130 
00131 #endif  ///< NET_INSTAWEB_REWRITER_PUBLIC_CSS_TAG_SCANNER_H_
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