101 строка
2.4 KiB
C++
101 строка
2.4 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 <better/optional.h>
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#include <folly/Likely.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(RawValue const &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(RawValue const &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, typename U = T>
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T convertRawProp(
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RawProps const &rawProps,
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char const *name,
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T const &sourceValue,
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U const &defaultValue = U(),
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char const *namePrefix = nullptr,
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char const *nameSuffix = nullptr) {
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const auto *rawValue = rawProps.at(name, namePrefix, nameSuffix);
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if (LIKELY(rawValue == nullptr)) {
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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 (UNLIKELY(!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 better::optional<T> convertRawProp(
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RawProps const &rawProps,
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char const *name,
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better::optional<T> const &sourceValue,
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better::optional<T> const &defaultValue = {},
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char const *namePrefix = nullptr,
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char const *nameSuffix = nullptr) {
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const auto *rawValue = rawProps.at(name, namePrefix, nameSuffix);
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if (LIKELY(rawValue == nullptr)) {
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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 (UNLIKELY(!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 better::optional<T>{result};
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}
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} // namespace react
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} // namespace facebook
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