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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/platform/bindings/callback_method_retriever.h"
#include "third_party/blink/renderer/platform/bindings/callback_function_base.h"
#include "third_party/blink/renderer/platform/bindings/exception_state.h"
#include "third_party/blink/renderer/platform/bindings/v8_binding.h"
#include "third_party/blink/renderer/platform/wtf/text/strcat.h"
namespace blink {
CallbackMethodRetriever::CallbackMethodRetriever(
CallbackFunctionBase* constructor)
: constructor_(constructor),
isolate_(constructor_->GetIsolate()),
current_context_(isolate_->GetCurrentContext()) {
DCHECK(constructor_->IsConstructor());
}
v8::Local<v8::Object> CallbackMethodRetriever::GetPrototypeObject(
ExceptionState& exception_state) {
DCHECK(prototype_object_.IsEmpty()) << "Do not call GetPrototypeObject twice";
// https://html.spec.whatwg.org/C/custom-elements.html#element-definition
// step 10.1. Let prototype be Get(constructor, "prototype"). Rethrow any
// exceptions.
TryRethrowScope rethrow_scope(isolate_, exception_state);
v8::Local<v8::Value> prototype;
if (!constructor_->CallbackObject()
->Get(current_context_, V8AtomicString(isolate_, "prototype"))
.ToLocal(&prototype)) {
return v8::Local<v8::Object>();
}
// step 10.2. If Type(prototype) is not Object, then throw a TypeError
// exception.
if (!prototype->IsObject()) {
exception_state.ThrowTypeError("constructor prototype is not an object");
return v8::Local<v8::Object>();
}
prototype_object_ = prototype.As<v8::Object>();
return prototype_object_;
}
v8::Local<v8::Value> CallbackMethodRetriever::GetFunctionOrUndefined(
v8::Local<v8::Object> object,
const StringView& property,
ExceptionState& exception_state) {
DCHECK(prototype_object_->IsObject());
TryRethrowScope rethrow_scope(isolate_, exception_state);
v8::Local<v8::Value> value;
if (!object->Get(current_context_, V8AtomicString(isolate_, property))
.ToLocal(&value)) {
return v8::Local<v8::Function>();
}
if (!value->IsUndefined() && !value->IsFunction()) {
exception_state.ThrowTypeError(
StrCat({"\"", property, "\" is not a function"}));
return v8::Local<v8::Function>();
}
return value;
}
v8::Local<v8::Function> CallbackMethodRetriever::GetFunctionOrThrow(
v8::Local<v8::Object> object,
const StringView& property,
ExceptionState& exception_state) {
v8::Local<v8::Value> value =
GetFunctionOrUndefined(object, property, exception_state);
if (exception_state.HadException())
return v8::Local<v8::Function>();
if (value->IsUndefined()) {
exception_state.ThrowTypeError(
StrCat({"Property \"", property, "\" doesn't exist"}));
return v8::Local<v8::Function>();
}
return value.As<v8::Function>();
}
} // namespace blink
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