make_show_ads_async_filter.h

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/*
 * Copyright 2014 Google Inc.
 *
 * 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 NET_INSTAWEB_REWRITER_PUBLIC_MAKE_SHOW_ADS_ASYNC_FILTER_H_
#define NET_INSTAWEB_REWRITER_PUBLIC_MAKE_SHOW_ADS_ASYNC_FILTER_H_

#include "net/instaweb/rewriter/public/common_filter.h"
#include "net/instaweb/rewriter/public/rewrite_driver.h"
#include "pagespeed/kernel/base/basictypes.h"
#include "pagespeed/kernel/base/string.h"
#include "pagespeed/kernel/html/html_element.h"
#include "pagespeed/kernel/html/html_filter.h"
#include "pagespeed/kernel/html/html_node.h"
#include "pagespeed/opt/ads/show_ads_snippet_parser.h"

namespace net_instaweb {

class Statistics;
class Variable;

class MakeShowAdsAsyncFilter : public CommonFilter {
 public:
  static const char kShowAdsSnippetsConverted[];
  static const char kShowAdsSnippetsNotConverted[];
  static const char kShowAdsApiReplacedForAsync[];

  explicit MakeShowAdsAsyncFilter(RewriteDriver* rewrite_driver);
  virtual ~MakeShowAdsAsyncFilter();

  static void InitStats(Statistics* statistics);

  virtual void StartDocumentImpl();
  virtual void StartElementImpl(HtmlElement* element);
  virtual void EndElementImpl(HtmlElement* element);

  virtual const char* Name() const {
    return "MakeShowAdsAsyncFilter";
  }
  virtual void Characters(HtmlCharactersNode* characters);
  ScriptUsage GetScriptUsage() const override { return kWillInjectScripts; }

 private:
  bool IsApplicableShowAds(
      const GoogleString& content,
      ShowAdsSnippetParser::AttributeMap* parsed_attributes) const;

  void ReplaceShowAdsWithAdsByGoogleElement(
      const ShowAdsSnippetParser::AttributeMap& parsed_attributes,
      HtmlElement* show_ads_elment);
  void ReplaceShowAdsApiCallWithAdsByGoogleApiCall(
      HtmlElement* show_ads_elment);

  HtmlElement* current_script_element_;
  GoogleString current_script_element_contents_;

  bool has_ads_by_google_js_;
  int32 num_pending_show_ads_api_call_replacements_;

  ShowAdsSnippetParser show_ads_snippet_parser_;

  Variable* show_ads_snippets_converted_count_;
  Variable* show_ads_snippets_not_converted_count_;
  Variable* show_ads_api_replaced_for_async_;

  
};

}  

#endif