mirror of
https://github.com/facebook/react-native.git
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Valentin SherginandFacebook Github Bot
9842e39019
Summary: Our long-term plan is to completely illuminate `jsi::Value`-to-`folly::dynamic` serialization step in prop parsing process improving performance and memory pressure. At the same time, we don't want to introduce a hard dependency in application code to JSI because it exposes direct access to VM and prevents parsing some data that come *NOT* from JSVM. RawValue is an extremely light-weight (hopefully fully optimized-out) abstraction that provides limited JSON-like and C++-idiomatic interface. The current particular implementation is still using `folly::dynamic` inside, but I have fully JSI-powered one which will replace the current one right after we figure out how to deal with folly::dynamic-specific callsites. Or we can implement RawValue in a hybrid manner if a code-size implication of that will be minimal. Reviewed By: JoshuaGross, mdvacca Differential Revision: D13962466 fbshipit-source-id: e848522fd242f21e9e771773f2103f1c1d9d7f21
98 lines
2.6 KiB
C++
98 lines
2.6 KiB
C++
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#pragma once
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#include <folly/dynamic.h>
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#include <jsi/JSIDynamic.h>
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#include <jsi/jsi.h>
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#include <react/core/RawValue.h>
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namespace facebook {
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namespace react {
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/*
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* `RawProps` represents an untyped map of props comes from JavaScript side.
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* `RawProps` stores JSI (or `folly::dynamic`) primitives inside and abstract
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* them as `RawValue` objects.
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* `RawProps` is NOT a thread-safe type nor long-living type.
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* The caller must not store values of this type.
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* The class is practically a wrapper around a `jsi::Value and `jsi::Runtime`
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* pair (or folly::dynamic) preventing direct access to it and inefficient
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* misuse. Not copyable, not moveable.
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*/
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class RawProps {
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public:
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/*
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* Creates an object with given `runtime` and `value`.
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*/
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RawProps(jsi::Runtime &runtime, const jsi::Value &value) noexcept
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: RawProps(
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value.isNull() ? folly::dynamic::object()
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: jsi::dynamicFromValue(runtime, value)) {}
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/*
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* Creates an object with given `folly::dynamic` object.
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* Deprecated.
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* We need this temporary, only because we have a callsite that does not have
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* a `jsi::Runtime` behind the data.
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*/
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RawProps(const folly::dynamic &dynamic) noexcept
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:
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#ifdef ANDROID
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dynamic_(dynamic),
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#endif
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map_((std::unordered_map<std::string, RawValue>)RawValue(dynamic)) {
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}
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/*
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* Not moveable.
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*/
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RawProps(RawProps &&other) noexcept = delete;
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RawProps &operator=(RawProps &&other) noexcept = delete;
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/*
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* Not copyable.
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*/
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RawProps(const RawProps &other) noexcept = delete;
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RawProps &operator=(const RawProps &other) noexcept = delete;
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#ifdef ANDROID
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/*
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* Deprecated. Do not use.
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* The support for explicit conversion to `folly::dynamic` is deprecated and
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* will be removed as soon Android implementation does not need it.
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*/
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explicit operator folly::dynamic() const noexcept {
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return dynamic_;
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}
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#endif
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/*
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* Returns a const unowning pointer to `RawValue` of a prop with a given name.
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* Returns `nullptr`, it a prop with the given name does not exist.
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*/
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const RawValue *at(const std::string &name) const noexcept {
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auto iterator = map_.find(name);
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if (iterator == map_.end()) {
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return nullptr;
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}
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return &iterator->second;
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}
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private:
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#ifdef ANDROID
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const folly::dynamic dynamic_;
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#endif
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const std::unordered_map<std::string, RawValue> map_;
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};
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} // namespace react
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} // namespace facebook
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