mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
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
96 lines
2.2 KiB
C++
96 lines
2.2 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/Optional.h>
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#include <folly/dynamic.h>
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#include <react/core/RawProps.h>
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#include <react/graphics/Color.h>
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#include <react/graphics/Geometry.h>
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#include <react/graphics/conversions.h>
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namespace facebook {
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namespace react {
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template <typename T>
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void fromRawValue(const RawValue &rawValue, T &result) {
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result = (T)rawValue;
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}
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template <typename T>
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void fromRawValue(const RawValue &rawValue, std::vector<T> &result) {
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if (rawValue.hasType<std::vector<RawValue>>()) {
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auto items = (std::vector<RawValue>)rawValue;
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auto length = items.size();
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result.clear();
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result.reserve(length);
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for (int i = 0; i < length; i++) {
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T itemResult;
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fromRawValue(items.at(i), itemResult);
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result.push_back(itemResult);
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}
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return;
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}
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// The case where `value` is not an array.
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result.clear();
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result.reserve(1);
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T itemResult;
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fromRawValue(rawValue, itemResult);
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result.push_back(itemResult);
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}
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template <typename T>
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T convertRawProp(
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const RawProps &rawProps,
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const std::string &name,
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const T &sourceValue,
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const T &defaultValue = T()) {
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const auto rawValue = rawProps.at(name);
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if (!rawValue) {
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return sourceValue;
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}
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// Special case: `null` always means `the prop was removed, use default
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// value`.
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if (!rawValue->hasValue()) {
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return defaultValue;
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}
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T result;
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fromRawValue(*rawValue, result);
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return result;
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}
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template <typename T>
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static folly::Optional<T> convertRawProp(
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const RawProps &rawProps,
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const std::string &name,
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const folly::Optional<T> &sourceValue,
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const folly::Optional<T> &defaultValue = {}) {
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const auto rawValue = rawProps.at(name);
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if (!rawValue) {
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return sourceValue;
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}
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// Special case: `null` always means `the prop was removed, use default
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// value`.
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if (!rawValue->hasValue()) {
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return defaultValue;
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}
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T result;
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fromRawValue(*rawValue, result);
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return folly::Optional<T>{result};
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}
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} // namespace react
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} // namespace facebook
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