mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Joshua Gross
d1d11c7639
Summary: MSVC doesn't like Clang macros. Oops! Constraints with this bit of code: 1. I'm trying to enforce constexpr in the most obvious, intuitive way possible. Macros are ugly but a "proper" solution would result in 10x as much code that is, totally subjectively, less readable to me. 2. This is evaluating at compile-time a hash of a string which is usually used in the `case` line of a switch statement. For now I'm just hoping that MSVC will allow us to shadow `hash` which Xcode doesn't like. We might need to add a special pragma(s) for MSVC if it still doesn't like this. Changelog: [Internal] Reviewed By: lyahdav Differential Revision: D37529949 fbshipit-source-id: 9aa605a9786bf5d194819ef8dade778875ae744e
95 lines
4.8 KiB
C++
95 lines
4.8 KiB
C++
/*
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* Copyright (c) Meta Platforms, Inc. and 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 <react/renderer/core/RawPropsPrimitives.h>
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// We need to use clang pragmas inside of a macro below,
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// so we need to pull out the "if" statement here.
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#if __clang__
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#define CLANG_PRAGMA(s) _Pragma(s)
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#else
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#define CLANG_PRAGMA(s)
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#endif
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// Get hash at compile-time. sizeof(str) - 1 == strlen
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#define CONSTEXPR_RAW_PROPS_KEY_HASH(s) \
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({ \
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CLANG_PRAGMA("clang diagnostic push") \
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CLANG_PRAGMA("clang diagnostic ignored \"-Wshadow\"") \
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constexpr RawPropsPropNameHash propNameHash = \
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folly::hash::fnv32_buf(s, sizeof(s) - 1); \
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propNameHash; \
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CLANG_PRAGMA("clang diagnostic pop") \
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})
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#define RAW_PROPS_KEY_HASH(s) folly::hash::fnv32_buf(s, std::strlen(s))
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// Convenience for building setProps switch statements.
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// This injects `fromRawValue` into source; each file that uses
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// this macro must import the proper, respective headers required.
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#define RAW_SET_PROP_SWITCH_CASE(field, jsPropName, defaultValue) \
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case CONSTEXPR_RAW_PROPS_KEY_HASH(jsPropName): \
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fromRawValue(context, value, field, defaultValue); \
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return;
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// Convenience for building setProps switch statements where the field name is
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// the same as the string identifier
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#define RAW_SET_PROP_SWITCH_CASE_BASIC(field, defaultValue) \
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RAW_SET_PROP_SWITCH_CASE(field, #field, defaultValue)
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#define CASE_STATEMENT_SET_FIELD_VALUE_INDEXED( \
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struct, field, fieldNameString, value) \
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case CONSTEXPR_RAW_PROPS_KEY_HASH(fieldNameString): { \
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if (!value.hasValue()) { \
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decltype(struct) defaultValues{}; \
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struct.field = defaultValues.field; \
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return; \
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} \
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fromRawValue(context, value, struct.field); \
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return; \
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}
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#define SET_CASCADED_RECTANGLE_CORNERS(struct, prefix, suffix, rawValue) \
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CASE_STATEMENT_SET_FIELD_VALUE_INDEXED( \
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struct, topLeft, prefix "TopLeft" suffix, rawValue) \
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CASE_STATEMENT_SET_FIELD_VALUE_INDEXED( \
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struct, topRight, prefix "TopRight" suffix, rawValue) \
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CASE_STATEMENT_SET_FIELD_VALUE_INDEXED( \
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struct, bottomLeft, prefix "BottomLeft" suffix, rawValue) \
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CASE_STATEMENT_SET_FIELD_VALUE_INDEXED( \
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struct, bottomRight, prefix "BottomRight" suffix, rawValue) \
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CASE_STATEMENT_SET_FIELD_VALUE_INDEXED( \
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struct, topStart, prefix "TopStart" suffix, rawValue) \
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CASE_STATEMENT_SET_FIELD_VALUE_INDEXED( \
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struct, topEnd, prefix "TopEnd" suffix, rawValue) \
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CASE_STATEMENT_SET_FIELD_VALUE_INDEXED( \
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struct, bottomStart, prefix "BottomStart" suffix, rawValue) \
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CASE_STATEMENT_SET_FIELD_VALUE_INDEXED( \
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struct, bottomEnd, prefix "BottomEnd" suffix, rawValue)
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#define SET_CASCADED_RECTANGLE_EDGES(struct, prefix, suffix, rawValue) \
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CASE_STATEMENT_SET_FIELD_VALUE_INDEXED( \
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struct, left, prefix "Left" suffix, rawValue) \
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CASE_STATEMENT_SET_FIELD_VALUE_INDEXED( \
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struct, right, prefix "Right" suffix, rawValue) \
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CASE_STATEMENT_SET_FIELD_VALUE_INDEXED( \
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struct, top, prefix "Top" suffix, rawValue) \
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CASE_STATEMENT_SET_FIELD_VALUE_INDEXED( \
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struct, bottom, prefix "Bottom" suffix, rawValue) \
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CASE_STATEMENT_SET_FIELD_VALUE_INDEXED( \
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struct, start, prefix "Start" suffix, rawValue) \
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CASE_STATEMENT_SET_FIELD_VALUE_INDEXED( \
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struct, end, prefix "End" suffix, rawValue) \
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CASE_STATEMENT_SET_FIELD_VALUE_INDEXED( \
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struct, horizontal, prefix "Horizontal" suffix, rawValue) \
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CASE_STATEMENT_SET_FIELD_VALUE_INDEXED( \
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struct, vertical, prefix "Vertical" suffix, rawValue) \
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CASE_STATEMENT_SET_FIELD_VALUE_INDEXED( \
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struct, all, prefix "" suffix, rawValue)
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