| 1 | //===-- lib/Parser/type-parser-implementation.h -----------------*- C++ -*-===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | // Macros for implementing per-type parsers |
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| 10 | |
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| 11 | #ifndef FORTRAN_PARSER_TYPE_PARSER_IMPLEMENTATION_H_ |
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| 12 | #define FORTRAN_PARSER_TYPE_PARSER_IMPLEMENTATION_H_ |
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| 13 | |
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| 14 | #include "type-parsers.h" |
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| 15 | |
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| 16 | #undef TYPE_PARSER |
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| 17 | #undef TYPE_CONTEXT_PARSER |
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| 18 | |
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| 19 | // The result type of a parser combinator expression is determined |
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| 20 | // here via "decltype(attempt(pexpr))" to work around a g++ bug that |
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| 21 | // causes it to crash on "decltype(pexpr)" when pexpr's top-level |
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| 22 | // operator is an overridden || of parsing alternatives. |
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| 23 | #define TYPE_PARSER(pexpr) \ |
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| 24 | template <> \ |
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| 25 | auto Parser<typename decltype(attempt(pexpr))::resultType>::Parse( \ |
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| 26 | ParseState &state) \ |
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| 27 | ->std::optional<resultType> { \ |
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| 28 | static constexpr auto parser{(pexpr)}; \ |
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| 29 | return parser.Parse(state); \ |
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| 30 | } |
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| 31 | |
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| 32 | #define TYPE_CONTEXT_PARSER(contextText, pexpr) \ |
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| 33 | TYPE_PARSER(CONTEXT_PARSER((contextText), (pexpr))) |
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| 34 | |
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| 35 | #endif |
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| 36 | |
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