146 lines
4.9 KiB
C++
146 lines
4.9 KiB
C++
// Copyright 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE.chromium file.
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#ifndef NATIVE_MATE_DICTIONARY_H_
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#define NATIVE_MATE_DICTIONARY_H_
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#include "native_mate/converter.h"
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#include "native_mate/object_template_builder.h"
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namespace mate {
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namespace internal {
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// Returns true if |maybe| is both a value, and that value is true.
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inline bool IsTrue(v8::Maybe<bool> maybe) {
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return maybe.IsJust() && maybe.FromJust();
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}
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} // namespace internal
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// Dictionary is useful when writing bindings for a function that either
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// receives an arbitrary JavaScript object as an argument or returns an
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// arbitrary JavaScript object as a result. For example, Dictionary is useful
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// when you might use the |dictionary| type in WebIDL:
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//
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// http://heycam.github.io/webidl/#idl-dictionaries
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//
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// WARNING: You cannot retain a Dictionary object in the heap. The underlying
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// storage for Dictionary is tied to the closest enclosing
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// v8::HandleScope. Generally speaking, you should store a Dictionary
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// on the stack.
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//
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class Dictionary {
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public:
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Dictionary();
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Dictionary(v8::Isolate* isolate, v8::Local<v8::Object> object);
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~Dictionary();
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static Dictionary CreateEmpty(v8::Isolate* isolate);
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template<typename T>
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bool Get(const base::StringPiece& key, T* out) const {
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// Check for existence before getting, otherwise this method will always
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// returns true when T == v8::Local<v8::Value>.
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v8::Local<v8::Context> context = isolate_->GetCurrentContext();
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v8::Local<v8::String> v8_key = StringToV8(isolate_, key);
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if (!internal::IsTrue(GetHandle()->Has(context, v8_key)))
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return false;
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v8::Local<v8::Value> val;
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if (!GetHandle()->Get(context, v8_key).ToLocal(&val))
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return false;
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return ConvertFromV8(isolate_, val, out);
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}
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template<typename T>
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bool GetHidden(const base::StringPiece& key, T* out) const {
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v8::Local<v8::Context> context = isolate_->GetCurrentContext();
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v8::Local<v8::Private> privateKey =
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v8::Private::ForApi(isolate_, StringToV8(isolate_, key));
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v8::Local<v8::Value> value;
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v8::Maybe<bool> result =
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GetHandle()->HasPrivate(context, privateKey);
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if (internal::IsTrue(result) &&
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GetHandle()->GetPrivate(context, privateKey).ToLocal(&value))
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return ConvertFromV8(isolate_, value, out);
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return false;
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}
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template<typename T>
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bool Set(const base::StringPiece& key, T val) {
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v8::Local<v8::Value> v8_value;
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if (!TryConvertToV8(isolate_, val, &v8_value))
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return false;
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v8::Maybe<bool> result =
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GetHandle()->Set(isolate_->GetCurrentContext(),
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StringToV8(isolate_, key),
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v8_value);
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return !result.IsNothing() && result.FromJust();
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}
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template<typename T>
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bool SetHidden(const base::StringPiece& key, T val) {
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v8::Local<v8::Value> v8_value;
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if (!TryConvertToV8(isolate_, val, &v8_value))
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return false;
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v8::Local<v8::Context> context = isolate_->GetCurrentContext();
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v8::Local<v8::Private> privateKey =
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v8::Private::ForApi(isolate_, StringToV8(isolate_, key));
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v8::Maybe<bool> result =
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GetHandle()->SetPrivate(context, privateKey, v8_value);
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return !result.IsNothing() && result.FromJust();
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}
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template<typename T>
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bool SetReadOnly(const base::StringPiece& key, T val) {
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v8::Local<v8::Value> v8_value;
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if (!TryConvertToV8(isolate_, val, &v8_value))
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return false;
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v8::Maybe<bool> result =
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GetHandle()->DefineOwnProperty(isolate_->GetCurrentContext(),
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StringToV8(isolate_, key),
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v8_value,
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v8::ReadOnly);
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return !result.IsNothing() && result.FromJust();
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}
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template<typename T>
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bool SetMethod(const base::StringPiece& key, const T& callback) {
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return GetHandle()->Set(
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StringToV8(isolate_, key),
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CallbackTraits<T>::CreateTemplate(isolate_, callback)->GetFunction());
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}
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bool Delete(const base::StringPiece& key) {
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v8::Maybe<bool> result = GetHandle()->Delete(isolate_->GetCurrentContext(),
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StringToV8(isolate_, key));
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return !result.IsNothing() && result.FromJust();
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}
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bool IsEmpty() const { return isolate() == NULL; }
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virtual v8::Local<v8::Object> GetHandle() const;
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v8::Isolate* isolate() const { return isolate_; }
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protected:
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v8::Isolate* isolate_;
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private:
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v8::Local<v8::Object> object_;
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};
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template<>
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struct Converter<Dictionary> {
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static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
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Dictionary val);
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static bool FromV8(v8::Isolate* isolate,
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v8::Local<v8::Value> val,
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Dictionary* out);
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};
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} // namespace mate
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#endif // NATIVE_MATE_DICTIONARY_H_
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