js_inline_filter.h

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/*
 * Copyright 2010 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_JS_INLINE_FILTER_H_
#define NET_INSTAWEB_REWRITER_PUBLIC_JS_INLINE_FILTER_H_

#include <cstddef>

#include "net/instaweb/rewriter/public/common_filter.h"
#include "net/instaweb/rewriter/public/resource.h"
#include "net/instaweb/rewriter/public/rewrite_driver.h"
#include "net/instaweb/rewriter/public/rewrite_options.h"
#include "net/instaweb/rewriter/public/script_tag_scanner.h"
#include "pagespeed/kernel/base/basictypes.h"
#include "pagespeed/kernel/base/string.h"
#include "pagespeed/kernel/base/string_util.h"
#include "pagespeed/kernel/html/html_element.h"
#include "pagespeed/kernel/html/html_filter.h"
#include "pagespeed/kernel/html/html_node.h"
#include "pagespeed/kernel/http/semantic_type.h"

namespace net_instaweb {
class Statistics;
class Variable;

class JsInlineFilter : public CommonFilter {
 public:
  static const char kNumJsInlined[];
  explicit JsInlineFilter(RewriteDriver* driver);
  virtual ~JsInlineFilter();

  virtual void StartDocumentImpl();
  virtual void EndDocument();
  virtual void StartElementImpl(HtmlElement* element);
  virtual void EndElementImpl(HtmlElement* element);
  virtual void Characters(HtmlCharactersNode* characters);
  virtual const char* Name() const { return "InlineJs"; }
  virtual RewriteDriver::InlineAuthorizationPolicy AllowUnauthorizedDomain()
      const {
    return driver()->options()->HasInlineUnauthorizedResourceType(
               semantic_type::kScript) ?
           RewriteDriver::kInlineUnauthorizedResources :
           RewriteDriver::kInlineOnlyAuthorizedResources;
  }
  virtual bool IntendedForInlining() const { return true; }
  ScriptUsage GetScriptUsage() const override { return kWillInjectScripts; }

  static void InitStats(Statistics* statistics);

 private:
  class Context;
  friend class Context;

  bool ShouldInline(const ResourcePtr& resource, GoogleString* reason) const;
  void RenderInline(const ResourcePtr& resource, const StringPiece& text,
                    HtmlElement* element);

  const size_t size_threshold_bytes_;
  ScriptTagScanner script_tag_scanner_;

  bool should_inline_;

  Variable* num_js_inlined_;

  
};

}  

#endif