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packages/react-native/ReactCommon/react/renderer/css/CSSZero.h
41 строка
1020 B
Nick Gerleman
Transform parsing (#49189)
07 фев 2025, 08:02
07 фев 2025, 08:02
36adaf4
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/* * Copyright (c) Meta Platforms, Inc. and affiliates. * * This source code is licensed under the MIT license found in the * LICENSE file in the root directory of this source tree. */ #pragma once #include <optional> #include <react/renderer/css/CSSDataType.h> namespace facebook::react { /** * The value <zero> represents a literal number with the value 0. Expressions * that merely evaluate to a <number> with the value 0 (for example, calc(0)) do * not match <zero>; only literal <number-token>s do. * * https://www.w3.org/TR/css-values-4/#zero-value */ struct CSSZero { constexpr bool operator==(const CSSZero& rhs) const = default; }; template <> struct CSSDataTypeParser<CSSZero> { static constexpr auto consumePreservedToken(const CSSPreservedToken& token) -> std::optional<CSSZero> { if (token.type() == CSSTokenType::Number && token.numericValue() == 0) { return CSSZero{}; } return {}; } }; static_assert(CSSDataType<CSSZero>); } // namespace facebook::react