0ea8decb0arefactor: make a variadic gin_helper::internal::InvokeFactory() Co-authored-by: trop[bot] <37223003+trop[bot]@users.noreply.github.com> Co-authored-by: Charles Kerr <charles@charleskerr.com>
103 lines
3.1 KiB
C++
103 lines
3.1 KiB
C++
// Copyright (c) 2018 GitHub, Inc.
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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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#ifndef ELECTRON_SHELL_COMMON_GIN_HELPER_CONSTRUCTOR_H_
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#define ELECTRON_SHELL_COMMON_GIN_HELPER_CONSTRUCTOR_H_
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#include <tuple>
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#include "shell/common/gin_helper/function_template.h"
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#include "shell/common/gin_helper/wrappable_base.h"
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namespace gin_helper {
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namespace internal {
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// Convert a `gin::Argument`'s arguments into a tuple of native types
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// by iteratively calling gin_helper::GetNextArgument().
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template <typename... Types>
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class GinArgumentsToTuple {
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public:
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[[nodiscard]] static std::pair<bool /*ok*/, std::tuple<Types...>> GetArgs(
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gin::Arguments* args) {
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bool ok = true;
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InvokerOptions opts{.holder_is_first_argument = true};
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auto tup = std::make_tuple(GetNextArg<Types>(args, opts, ok)...);
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return {ok, std::move(tup)};
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}
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private:
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template <typename T>
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static T GetNextArg(gin::Arguments* args, InvokerOptions& opts, bool& ok) {
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auto val = T{};
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ok = ok && gin_helper::GetNextArgument(args, opts, 0, &val);
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opts.holder_is_first_argument = false;
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return val;
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}
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};
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// Invoke a callback with arguments extracted from `args`.
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template <typename... Types>
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WrappableBase* InvokeFactory(
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gin::Arguments* args,
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const base::RepeatingCallback<WrappableBase*(Types...)>& callback) {
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auto [ok, tup] = GinArgumentsToTuple<Types...>::GetArgs(args);
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if (!ok)
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return {};
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return std::apply(
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[&callback](Types... args) { return callback.Run(std::move(args)...); },
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std::move(tup));
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}
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template <typename Sig>
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void InvokeNew(const base::RepeatingCallback<Sig>& factory,
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v8::Isolate* isolate,
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gin_helper::Arguments* args) {
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if (!args->IsConstructCall()) {
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args->ThrowError("Requires constructor call");
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return;
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}
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WrappableBase* object;
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{
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// Don't continue if the constructor throws an exception.
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v8::TryCatch try_catch{isolate};
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object = internal::InvokeFactory(args, factory);
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if (try_catch.HasCaught()) {
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try_catch.ReThrow();
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return;
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}
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}
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if (!object)
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args->ThrowError();
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return;
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}
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} // namespace internal
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// Create a FunctionTemplate that can be "new"ed in JavaScript.
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// It is user's responsibility to ensure this function is called for one type
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// only ONCE in the program's whole lifetime, otherwise we would have memory
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// leak.
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template <typename T, typename Sig>
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v8::Local<v8::Function> CreateConstructor(
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v8::Isolate* isolate,
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const base::RepeatingCallback<Sig>& func) {
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#ifndef NDEBUG
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static bool called = false;
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CHECK(!called) << "CreateConstructor can only be called for one type once";
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called = true;
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#endif
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v8::Local<v8::FunctionTemplate> templ = gin_helper::CreateFunctionTemplate(
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isolate, base::BindRepeating(&internal::InvokeNew<Sig>, func));
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templ->InstanceTemplate()->SetInternalFieldCount(1);
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T::BuildPrototype(isolate, templ);
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return templ->GetFunction(isolate->GetCurrentContext()).ToLocalChecked();
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}
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} // namespace gin_helper
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#endif // ELECTRON_SHELL_COMMON_GIN_HELPER_CONSTRUCTOR_H_
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