78 lines
2.6 KiB
C++
78 lines
2.6 KiB
C++
// Copyright (c) 2015 GitHub, Inc. All rights reserved.
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// Use of this source code is governed by the MIT license that can be
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// found in the LICENSE file.
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#include "atom/common/native_mate_converters/callback.h"
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namespace mate {
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namespace internal {
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namespace {
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struct TranslaterHolder {
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Translater translater;
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};
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// Cached JavaScript version of |CallTranslater|.
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v8::Persistent<v8::FunctionTemplate> g_call_translater;
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void CallTranslater(v8::Local<v8::External> external,
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v8::Local<v8::Object> state,
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mate::Arguments* args) {
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v8::Isolate* isolate = args->isolate();
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// Check if the callback has already been called.
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v8::Local<v8::String> called_symbol = mate::StringToSymbol(isolate, "called");
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if (state->Has(called_symbol)) {
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args->ThrowError("callback can only be called for once");
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return;
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} else {
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state->Set(called_symbol, v8::Boolean::New(isolate, true));
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}
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TranslaterHolder* holder = static_cast<TranslaterHolder*>(external->Value());
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holder->translater.Run(args);
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delete holder;
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}
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// func.bind(func, arg1).
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// NB(zcbenz): Using C++11 version crashes VS.
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v8::Local<v8::Value> BindFunctionWith(v8::Isolate* isolate,
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v8::Local<v8::Context> context,
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v8::Local<v8::Function> func,
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v8::Local<v8::Value> arg1,
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v8::Local<v8::Value> arg2) {
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v8::MaybeLocal<v8::Value> bind = func->Get(mate::StringToV8(isolate, "bind"));
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CHECK(!bind.IsEmpty());
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v8::Local<v8::Function> bind_func =
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v8::Local<v8::Function>::Cast(bind.ToLocalChecked());
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v8::Local<v8::Value> converted[] = { func, arg1, arg2 };
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return bind_func->Call(
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context, func, arraysize(converted), converted).ToLocalChecked();
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}
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} // namespace
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v8::Local<v8::Value> CreateFunctionFromTranslater(
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v8::Isolate* isolate, const Translater& translater) {
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// The FunctionTemplate is cached.
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if (g_call_translater.IsEmpty())
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g_call_translater.Reset(
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isolate,
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mate::CreateFunctionTemplate(isolate, base::Bind(&CallTranslater)));
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v8::Local<v8::FunctionTemplate> call_translater =
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v8::Local<v8::FunctionTemplate>::New(isolate, g_call_translater);
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TranslaterHolder* holder = new TranslaterHolder;
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holder->translater = translater;
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return BindFunctionWith(isolate,
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isolate->GetCurrentContext(),
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call_translater->GetFunction(),
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v8::External::New(isolate, holder),
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v8::Object::New(isolate));
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}
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} // namespace internal
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} // namespace mate
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