Revert 125801 - Implement a module system for the extension bindings JS.

chrome/renderer/module_system.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_RENDERER_MODULE_SYSTEM_H_
 #define CHROME_RENDERER_MODULE_SYSTEM_H_
 #pragma once
 
 #include "base/compiler_specific.h"
 #include "base/memory/linked_ptr.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/string_piece.h"
 #include "chrome/renderer/native_handler.h"
 #include "v8/include/v8.h"
 
 #include <map>
 #include <string>
 
-class SourceMap;
-
 // A module system for JS similar to node.js' require() function.
 // Each module has three variables in the global scope:
 //   - exports, an object returned to dependencies who require() this
 //     module.
 //   - require, a function that takes a module name as an argument and returns
 //     that module's exports object.
 //   - requireNative, a function that takes the name of a registered
 //     NativeHandler and returns an object that contains the functions the
 //     NativeHandler defines.
 //
 // Each module in a ModuleSystem is executed at most once and its exports
 // object cached.
-//
-// Note that a ModuleSystem must be used only in conjunction with a single
-// v8::Context.
-// TODO(koz): Rename this to JavaScriptModuleSystem.
 class ModuleSystem : public NativeHandler {
  public:
-  class SourceMap {
-   public:
-    virtual v8::Handle<v8::Value> GetSource(const std::string& name) = 0;
-    virtual bool Contains(const std::string& name) = 0;
-  };
-
   // |source_map| is a weak pointer.
-  explicit ModuleSystem(SourceMap* source_map);
+  explicit ModuleSystem(const std::map<std::string, std::string>* source_map);
   virtual ~ModuleSystem();
 
   // Require the specified module. This is the equivalent of calling
   // require('module_name') from the loaded JS files.
   void Require(const std::string& module_name);
 
   // Register |native_handler| as a potential target for requireNative(), so
   // calls to requireNative(|name|) from JS will return a new object created by
   // |native_handler|.
   void RegisterNativeHandler(const std::string& name,
-                             scoped_ptr<NativeHandler> native_handler);
-
-  // Executes |code| in the current context with |name| as the filename.
-  void RunString(const std::string& code, const std::string& name);
-
-  // When false |natives_enabled_| causes calls to GetNative() (the basis of
-  // requireNative() in JS) to throw an exception.
-  void set_natives_enabled(bool natives_enabled) {
-    natives_enabled_ = natives_enabled;
-  }
+      scoped_ptr<NativeHandler> native_handler);
 
  private:
-  typedef std::map<std::string, linked_ptr<NativeHandler> > NativeHandlerMap;
-
   // Ensure that require_ has been evaluated from require.js.
   void EnsureRequireLoaded();
 
-  // Run |code| in the current context with the name |name| used for stack
-  // traces.
-  v8::Handle<v8::Value> RunString(v8::Handle<v8::String> code,
-                                  v8::Handle<v8::String> name);
+  // Run |code| in the current context.
+  v8::Handle<v8::Value> RunString(v8::Handle<v8::String> code);
+
+  // Run the given code in the current context.
+  // |args[0]| - the code to execute.
+  v8::Handle<v8::Value> Run(const v8::Arguments& args);
 
   // Return the named source file stored in the source map.
   // |args[0]| - the name of a source file in source_map_.
   v8::Handle<v8::Value> GetSource(const v8::Arguments& args);
 
   // Return an object that contains the native methods defined by the named
   // NativeHandler.
   // |args[0]| - the name of a native handler object.
   v8::Handle<v8::Value> GetNative(const v8::Arguments& args);
 
-  base::StringPiece GetResource(int resource_id);
-
-  // Throws an exception in the calling JS context.
-  v8::Handle<v8::Value> ThrowException(const std::string& message);
-
   // A map from module names to the JS source for that module. GetSource()
   // performs a lookup on this map.
-  SourceMap* source_map_;
+  const std::map<std::string, std::string>* source_map_;
+  typedef std::map<std::string, linked_ptr<NativeHandler> > NativeHandlerMap;
   NativeHandlerMap native_handler_map_;
   v8::Handle<v8::Function> require_;
-  bool natives_enabled_;
 };
 
 #endif  // CHROME_RENDERER_MODULE_SYSTEM_H_