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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.
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_CALLBACK_METHOD_RETRIEVER_H_
#define 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/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "v8/include/v8.h"
namespace blink {
class CallbackFunctionBase;
class ExceptionState;
// Helper class to run step 10 of custom element definition, which part of the
// algorithm is expected to be defined in Web IDL so that other standards can
// apply the same algorithm.
//
// https://html.spec.whatwg.org/C/custom-elements.html#element-definition
// step 10. Run the following substeps while catching any exceptions: ...
class PLATFORM_EXPORT CallbackMethodRetriever {
STACK_ALLOCATED();
public:
explicit CallbackMethodRetriever(CallbackFunctionBase* constructor);
CallbackMethodRetriever(const CallbackMethodRetriever&) = delete;
CallbackMethodRetriever& operator=(const CallbackMethodRetriever&) = delete;
// Get the prototype object from the callback function. Must be invoked prior
// to GetMethod or GetStaticMethod.
v8::Local<v8::Object> GetPrototypeObject(ExceptionState&);
// Returns a function extracted from the prototype chain, or undefined.
// Throws if the property is neither of function nor undefined.
v8::Local<v8::Value> GetMethodOrUndefined(const StringView& method_name,
ExceptionState& exception_state) {
return GetFunctionOrUndefined(prototype_object_, method_name,
exception_state);
}
// Returns a function extracted from the prototype chain, or throw a TypeError
// if a function doesn't exist.
v8::Local<v8::Function> GetMethodOrThrow(const StringView& method_name,
ExceptionState& exception_state) {
return GetFunctionOrThrow(prototype_object_, method_name, exception_state);
}
// Returns a function extracted from the callback function, or undefined.
// Throws if the property is neither of function nor undefined.
v8::Local<v8::Value> GetStaticMethodOrUndefined(
const StringView& method_name,
ExceptionState& exception_state) {
return GetFunctionOrUndefined(constructor_->CallbackObject(), method_name,
exception_state);
}
// Returns a function extracted from the callback function, or throw a
// TypeError if a function doesn't exist.
v8::Local<v8::Function> GetStaticMethodOrThrow(
const StringView& method_name,
ExceptionState& exception_state) {
return GetFunctionOrThrow(constructor_->CallbackObject(), method_name,
exception_state);
}
private:
// Gets |property| from |object|. Throws an exception if the property is
// neither of function nor undefined.
v8::Local<v8::Value> GetFunctionOrUndefined(v8::Local<v8::Object> object,
const StringView& property,
ExceptionState&);
// Gets |property| from |object|. Throws an exception if the property is
// not a function.
v8::Local<v8::Function> GetFunctionOrThrow(v8::Local<v8::Object> object,
const StringView& property,
ExceptionState&);
CallbackFunctionBase* constructor_;
v8::Isolate* isolate_;
v8::Local<v8::Context> current_context_;
v8::Local<v8::Object> prototype_object_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_CALLBACK_METHOD_RETRIEVER_H_
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