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// 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);
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;
}
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);
// 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);
v8::Handle<v8::Function> GetOrCreateRequire();
v8::Handle<v8::Function> CreateRequire();
// A map from module names to the JS source for that module. GetSource()
// performs a lookup on this map.
SourceMap* source_map_;
NativeHandlerMap native_handler_map_;
bool natives_enabled_;
};
#endif // CHROME_RENDERER_MODULE_SYSTEM_H_
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