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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.
#include "chrome/renderer/module_system.h"
#include "base/bind.h"
namespace {
const char* kLazyObjectSource = "lazy_object_source";
const char* kLazyObjectName = "lazy_object_name";
const char* kLazyObject = "lazy_object";
v8::Handle<v8::Object> EvaluateLazySource(v8::Handle<v8::Object> object) {
v8::HandleScope handle_scope;
v8::Handle<v8::Value> source_value =
object->GetHiddenValue(v8::String::New(kLazyObjectSource));
CHECK(!source_value.IsEmpty());
v8::Handle<v8::String> source = v8::Handle<v8::String>::Cast(source_value);
v8::Handle<v8::Value> name =
object->GetHiddenValue(v8::String::New(kLazyObjectName));
CHECK(!name.IsEmpty());
CHECK(name->IsString());
v8::Handle<v8::Script> script = v8::Script::New(source, name);
v8::Handle<v8::Value> result = script->Run();
CHECK(result->IsObject());
return handle_scope.Close(v8::Handle<v8::Object>::Cast(result));
}
v8::Handle<v8::Value> LazyObjectGetter(
const v8::Local<v8::String> property,
const v8::AccessorInfo& info) {
v8::HandleScope handle_scope;
v8::Handle<v8::Object> object = info.Holder();
v8::Handle<v8::String> lazy_object_name = v8::String::New(kLazyObject);
v8::Handle<v8::Value> lazy_object_value =
object->GetHiddenValue(lazy_object_name);
CHECK(lazy_object_value.IsEmpty() || lazy_object_value->IsObject());
v8::Handle<v8::Object> lazy_object =
v8::Handle<v8::Object>::Cast(lazy_object_value);
if (lazy_object.IsEmpty()) {
lazy_object = EvaluateLazySource(object);
object->SetHiddenValue(lazy_object_name, lazy_object);
}
return handle_scope.Close(lazy_object->Get(property));
}
} // namespace
ModuleSystem::ModuleSystem(SourceMap* source_map)
: source_map_(source_map),
natives_enabled_(true) {
RouteFunction("require",
base::Bind(&ModuleSystem::RequireForJs, base::Unretained(this)));
RouteFunction("requireNative",
base::Bind(&ModuleSystem::GetNative, base::Unretained(this)));
v8::Handle<v8::Object> global(v8::Context::GetCurrent()->Global());
global->SetHiddenValue(v8::String::New("modules"), v8::Object::New());
}
ModuleSystem::~ModuleSystem() {
}
void ModuleSystem::Require(const std::string& module_name) {
v8::HandleScope handle_scope;
RequireForJsInner(v8::String::New(module_name.c_str()));
}
v8::Handle<v8::Value> ModuleSystem::RequireForJs(const v8::Arguments& args) {
v8::HandleScope handle_scope;
v8::Handle<v8::String> module_name = args[0]->ToString();
return handle_scope.Close(RequireForJsInner(module_name));
}
v8::Handle<v8::Value> ModuleSystem::RequireForJsInner(
v8::Handle<v8::String> module_name) {
v8::HandleScope handle_scope;
v8::Handle<v8::Object> global(v8::Context::GetCurrent()->Global());
v8::Handle<v8::Object> modules(v8::Handle<v8::Object>::Cast(
global->GetHiddenValue(v8::String::New("modules"))));
v8::Handle<v8::Value> exports(modules->Get(module_name));
if (!exports->IsUndefined())
return handle_scope.Close(exports);
v8::Handle<v8::Value> source(GetSource(module_name));
if (source->IsUndefined())
return handle_scope.Close(v8::Undefined());
v8::Handle<v8::String> wrapped_source(WrapSource(
v8::Handle<v8::String>::Cast(source)));
v8::Handle<v8::Function> func =
v8::Handle<v8::Function>::Cast(RunString(wrapped_source, module_name));
exports = v8::Object::New();
v8::Handle<v8::Object> natives(NewInstance());
v8::Handle<v8::Value> args[] = {
natives->Get(v8::String::NewSymbol("require")),
natives->Get(v8::String::NewSymbol("requireNative")),
exports,
};
func->Call(global, 3, args);
modules->Set(module_name, exports);
return handle_scope.Close(exports);
}
void ModuleSystem::RegisterNativeHandler(const std::string& name,
scoped_ptr<NativeHandler> native_handler) {
native_handler_map_[name] =
linked_ptr<NativeHandler>(native_handler.release());
}
void ModuleSystem::RunString(const std::string& code, const std::string& name) {
v8::HandleScope handle_scope;
RunString(v8::String::New(code.c_str()), v8::String::New(name.c_str()));
}
// static
v8::Handle<v8::Object> ModuleSystem::CreateLazyObject(
const std::string& source_name, v8::Handle<v8::String> source) {
v8::HandleScope handle_scope;
v8::Handle<v8::ObjectTemplate> object_template = v8::ObjectTemplate::New();
object_template->SetNamedPropertyHandler(LazyObjectGetter, NULL);
v8::Handle<v8::Object> object = object_template->NewInstance();
object->SetHiddenValue(v8::String::New(kLazyObjectSource), source);
object->SetHiddenValue(v8::String::New(kLazyObjectName),
v8::String::New(source_name.c_str()));
return handle_scope.Close(object);
}
v8::Handle<v8::Value> ModuleSystem::RunString(v8::Handle<v8::String> code,
v8::Handle<v8::String> name) {
v8::HandleScope handle_scope;
return handle_scope.Close(v8::Script::New(code, name)->Run());
}
v8::Handle<v8::Value> ModuleSystem::GetSource(
v8::Handle<v8::String> source_name) {
v8::HandleScope handle_scope;
std::string module_name = *v8::String::AsciiValue(source_name);
if (!source_map_->Contains(module_name))
return v8::Undefined();
return handle_scope.Close(source_map_->GetSource(module_name));
}
v8::Handle<v8::Value> ModuleSystem::GetNative(const v8::Arguments& args) {
CHECK_EQ(1, args.Length());
if (!natives_enabled_)
return ThrowException("Natives disabled");
std::string native_name = *v8::String::AsciiValue(args[0]->ToString());
NativeHandlerMap::iterator i = native_handler_map_.find(native_name);
if (i == native_handler_map_.end())
return v8::Undefined();
return i->second->NewInstance();
}
v8::Handle<v8::String> ModuleSystem::WrapSource(v8::Handle<v8::String> source) {
v8::HandleScope handle_scope;
v8::Handle<v8::String> left =
v8::String::New("(function(require, requireNative, exports) {");
v8::Handle<v8::String> right = v8::String::New("\n})");
return handle_scope.Close(
v8::String::Concat(left, v8::String::Concat(source, right)));
}
v8::Handle<v8::Value> ModuleSystem::ThrowException(const std::string& message) {
return v8::ThrowException(v8::String::New(message.c_str()));
}
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