Index: gin/function_template.h.pump |
diff --git a/gin/function_template.h.pump b/gin/function_template.h.pump |
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-$$ This is a pump file for generating file templates. Pump is a python |
-$$ script that is part of the Google Test suite of utilities. Description |
-$$ can be found here: |
-$$ |
-$$ http://code.google.com/p/googletest/wiki/PumpManual |
-$$ |
- |
-#ifndef GIN_FUNCTION_TEMPLATE_H_ |
-#define GIN_FUNCTION_TEMPLATE_H_ |
- |
-$var MAX_ARITY = 6 |
- |
-// Copyright 2013 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 "base/callback.h" |
-#include "base/logging.h" |
-#include "gin/arguments.h" |
-#include "gin/converter.h" |
-#include "gin/gin_export.h" |
-#include "v8/include/v8.h" |
- |
-namespace gin { |
- |
-class PerIsolateData; |
- |
-enum CreateFunctionTemplateFlags { |
- HolderIsFirstArgument = 1 << 0, |
-}; |
- |
-namespace internal { |
- |
-template<typename T> |
-struct CallbackParamTraits { |
- typedef T LocalType; |
-}; |
-template<typename T> |
-struct CallbackParamTraits<const T&> { |
- typedef T LocalType; |
-}; |
-template<typename T> |
-struct CallbackParamTraits<const T*> { |
- typedef T* LocalType; |
-}; |
- |
- |
-// CallbackHolder and CallbackHolderBase are used to pass a base::Callback from |
-// CreateFunctionTemplate through v8 (via v8::FunctionTemplate) to |
-// DispatchToCallback, where it is invoked. |
- |
-// This simple base class is used so that we can share a single object template |
-// among every CallbackHolder instance. |
-class GIN_EXPORT CallbackHolderBase { |
- public: |
- v8::Handle<v8::External> GetHandle(v8::Isolate* isolate); |
- |
- protected: |
- explicit CallbackHolderBase(v8::Isolate* isolate); |
- virtual ~CallbackHolderBase(); |
- |
- private: |
- static void WeakCallback( |
- const v8::WeakCallbackData<v8::External, CallbackHolderBase>& data); |
- |
- v8::Persistent<v8::External> v8_ref_; |
- |
- DISALLOW_COPY_AND_ASSIGN(CallbackHolderBase); |
-}; |
- |
-template<typename Sig> |
-class CallbackHolder : public CallbackHolderBase { |
- public: |
- CallbackHolder(v8::Isolate* isolate, |
- const base::Callback<Sig>& callback, |
- int flags) |
- : CallbackHolderBase(isolate), callback(callback), flags(flags) {} |
- base::Callback<Sig> callback; |
- int flags; |
- private: |
- virtual ~CallbackHolder() {} |
- |
- DISALLOW_COPY_AND_ASSIGN(CallbackHolder); |
-}; |
- |
- |
-// This set of templates invokes a base::Callback, converts the return type to a |
-// JavaScript value, and returns that value to script via the provided |
-// gin::Arguments object. |
-// |
-// In C++, you can declare the function foo(void), but you can't pass a void |
-// expression to foo. As a result, we must specialize the case of Callbacks that |
-// have the void return type. |
- |
-$range ARITY 0..MAX_ARITY |
-$for ARITY [[ |
-$var INV_ARITY = MAX_ARITY - ARITY |
-$range ARG 1..INV_ARITY |
-$range VOID INV_ARITY+1..MAX_ARITY |
- |
-$if ARITY == 0 [[ |
-template<typename R$for ARG [[, typename P$(ARG) = void]]> |
-struct Invoker { |
-]] $else [[ |
-template<typename R$for ARG [[, typename P$(ARG)]]> |
-struct Invoker<R$for ARG [[, P$(ARG)]]$for VOID [[, void]]> { |
-]] |
- |
- inline static void Go( |
- Arguments* args, |
- const base::Callback<R($for ARG , [[P$(ARG)]])>& callback$for ARG [[, |
- const P$(ARG)& a$(ARG)]]) { |
- args->Return(callback.Run($for ARG, [[a$(ARG)]])); |
- } |
-}; |
-template<$for ARG , [[typename P$(ARG)]]> |
-struct Invoker<void$for ARG [[, P$(ARG)]]$for VOID [[, void]]> { |
- inline static void Go( |
- Arguments* args, |
- const base::Callback<void($for ARG , [[P$(ARG)]])>& callback$for ARG [[, |
- const P$(ARG)& a$(ARG)]]) { |
- callback.Run($for ARG, [[a$(ARG)]]); |
- } |
-}; |
- |
- |
-]] |
- |
-template<typename T> |
-bool GetNextArgument(Arguments* args, int create_flags, bool is_first, |
- T* result) { |
- if (is_first && (create_flags & HolderIsFirstArgument) != 0) { |
- return args->GetHolder(result); |
- } else { |
- return args->GetNext(result); |
- } |
-} |
- |
-// For advanced use cases, we allow callers to request the unparsed Arguments |
-// object and poke around in it directly. |
-inline bool GetNextArgument(Arguments* args, int create_flags, bool is_first, |
- Arguments* result) { |
- *result = *args; |
- return true; |
-} |
-inline bool GetNextArgument(Arguments* args, int create_flags, bool is_first, |
- Arguments** result) { |
- *result = args; |
- return true; |
-} |
- |
-// It's common for clients to just need the isolate, so we make that easy. |
-inline bool GetNextArgument(Arguments* args, int create_flags, |
- bool is_first, v8::Isolate** result) { |
- *result = args->isolate(); |
- return true; |
-} |
- |
- |
-// DispatchToCallback converts all the JavaScript arguments to C++ types and |
-// invokes the base::Callback. |
-template<typename Sig> |
-struct Dispatcher { |
-}; |
- |
-$range ARITY 0..MAX_ARITY |
-$for ARITY [[ |
-$range ARG 1..ARITY |
- |
-template<typename R$for ARG [[, typename P$(ARG)]]> |
-struct Dispatcher<R($for ARG , [[P$(ARG)]])> { |
- static void DispatchToCallback( |
- const v8::FunctionCallbackInfo<v8::Value>& info) { |
- Arguments args(info); |
- v8::Handle<v8::External> v8_holder; |
- CHECK(args.GetData(&v8_holder)); |
- CallbackHolderBase* holder_base = reinterpret_cast<CallbackHolderBase*>( |
- v8_holder->Value()); |
- |
- typedef CallbackHolder<R($for ARG , [[P$(ARG)]])> HolderT; |
- HolderT* holder = static_cast<HolderT*>(holder_base); |
- |
-$if ARITY != 0 [[ |
- |
- |
-$for ARG [[ typename CallbackParamTraits<P$(ARG)>::LocalType a$(ARG); |
- |
-]] |
- if ($for ARG || |
- [[!GetNextArgument(&args, holder->flags, $if ARG == 1 [[true]] $else [[false]], &a$(ARG))]]) { |
- args.ThrowError(); |
- return; |
- } |
- |
-]] |
- |
- Invoker<R$for ARG [[, P$(ARG)]]>::Go(&args, holder->callback$for ARG [[, a$(ARG)]]); |
- } |
-}; |
- |
-]] |
- |
-} // namespace internal |
- |
- |
-// CreateFunctionTemplate creates a v8::FunctionTemplate that will create |
-// JavaScript functions that execute a provided C++ function or base::Callback. |
-// JavaScript arguments are automatically converted via gin::Converter, as is |
-// the return value of the C++ function, if any. |
-template<typename Sig> |
-v8::Local<v8::FunctionTemplate> CreateFunctionTemplate( |
- v8::Isolate* isolate, const base::Callback<Sig> callback, |
- int callback_flags = 0) { |
- typedef internal::CallbackHolder<Sig> HolderT; |
- HolderT* holder = new HolderT(isolate, callback, callback_flags); |
- |
- return v8::FunctionTemplate::New( |
- isolate, |
- &internal::Dispatcher<Sig>::DispatchToCallback, |
- ConvertToV8<v8::Handle<v8::External> >(isolate, |
- holder->GetHandle(isolate))); |
-} |
- |
-// CreateFunctionHandler installs a CallAsFunction handler on the given |
-// object template that forwards to a provided C++ function or base::Callback. |
-template<typename Sig> |
-void CreateFunctionHandler(v8::Isolate* isolate, |
- v8::Local<v8::ObjectTemplate> tmpl, |
- const base::Callback<Sig> callback, |
- int callback_flags = 0) { |
- typedef internal::CallbackHolder<Sig> HolderT; |
- HolderT* holder = new HolderT(isolate, callback, callback_flags); |
- tmpl->SetCallAsFunctionHandler(&internal::Dispatcher<Sig>::DispatchToCallback, |
- ConvertToV8<v8::Handle<v8::External> >( |
- isolate, holder->GetHandle(isolate))); |
-} |
- |
-} // namespace gin |
- |
-#endif // GIN_FUNCTION_TEMPLATE_H_ |