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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef GIN_DICTIONARY_H_
#define GIN_DICTIONARY_H_
#include "base/memory/raw_ptr.h"
#include "gin/converter.h"
#include "gin/gin_export.h"
namespace gin {
// Dictionary is useful when writing bindings for a function that either
// receives an arbitrary JavaScript object as an argument or returns an
// arbitrary JavaScript object as a result. For example, Dictionary is useful
// when you might use the |dictionary| type in WebIDL:
//
// https://webidl.spec.whatwg.org/#idl-dictionaries
//
// WARNING: You cannot retain a Dictionary object in the heap. The underlying
// storage for Dictionary is tied to the closest enclosing
// v8::HandleScope. Generally speaking, you should store a Dictionary
// on the stack.
//
class GIN_EXPORT Dictionary {
public:
explicit Dictionary(v8::Isolate* isolate);
Dictionary(v8::Isolate* isolate, v8::Local<v8::Object> object);
Dictionary(const Dictionary& other);
~Dictionary();
static Dictionary CreateEmpty(v8::Isolate* isolate);
template<typename T>
bool Get(const std::string& key, T* out) {
v8::Local<v8::Value> val;
if (!object_->Get(isolate_->GetCurrentContext(), StringToV8(isolate_, key))
.ToLocal(&val)) {
return false;
}
return ConvertFromV8(isolate_, val, out);
}
template <typename T>
bool Set(const std::string& key, const T& val) {
v8::Local<v8::Value> v8_value;
if (!TryConvertToV8(isolate_, val, &v8_value))
return false;
v8::Maybe<bool> result =
object_->Set(isolate_->GetCurrentContext(), StringToV8(isolate_, key),
v8_value);
return !result.IsNothing() && result.FromJust();
}
v8::Isolate* isolate() const { return isolate_; }
private:
friend struct Converter<Dictionary>;
// TODO(aa): Remove this. Instead, get via FromV8(), Set(), and Get().
raw_ptr<v8::Isolate> isolate_;
v8::Local<v8::Object> object_;
};
template<>
struct GIN_EXPORT Converter<Dictionary> {
static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
Dictionary val);
static bool FromV8(v8::Isolate* isolate,
v8::Local<v8::Value> val,
Dictionary* out);
};
} // namespace gin
#endif // GIN_DICTIONARY_H_
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