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https://github.com/carbon-language/carbon-lang.git
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Jon Ross-Perkins
d96ede7144
A quick check suggests this isn't necessary -- probably because the implicit enum cast is used for comparisons. I think this adds a lot to the boilerplate feel of these types, so if we can remove it there's a lot less sharing to do.
61 lines
2.0 KiB
C++
61 lines
2.0 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#ifndef CARBON_TOOLCHAIN_PARSER_PARSER_STATE_H_
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#define CARBON_TOOLCHAIN_PARSER_PARSER_STATE_H_
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#include <cstdint>
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#include <iterator>
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#include "common/ostream.h"
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#include "llvm/ADT/StringRef.h"
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namespace Carbon {
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class ParserState {
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// Note that this must be declared earlier in the class so that its type can
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// be used, for example in the conversion operator.
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enum class StateEnum : uint8_t {
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#define CARBON_PARSER_STATE(Name) Name,
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#include "toolchain/parser/parser_state.def"
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};
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public:
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// `clang-format` has a bug with spacing around `->` returns in macros. See
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// https://bugs.llvm.org/show_bug.cgi?id=48320 for details.
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#define CARBON_PARSER_STATE(Name) \
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static constexpr auto Name()->ParserState { \
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return ParserState(StateEnum::Name); \
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}
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#include "toolchain/parser/parser_state.def"
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// The default constructor is deleted because objects of this type should
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// always be constructed using the above factory functions for each unique
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// kind.
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ParserState() = delete;
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// Gets a friendly name for the token for logging or debugging.
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[[nodiscard]] auto name() const -> llvm::StringRef;
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// Enable conversion to our private enum, including in a `constexpr` context,
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// to enable usage in `switch` and `case`. The enum remains private and
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// nothing else should be using this function.
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// NOLINTNEXTLINE(google-explicit-constructor)
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constexpr operator StateEnum() const { return state_; }
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void Print(llvm::raw_ostream& out) const { out << name(); }
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private:
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constexpr explicit ParserState(StateEnum k) : state_(k) {}
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StateEnum state_;
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};
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// We expect the parse node kind to fit compactly into 8 bits.
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static_assert(sizeof(ParserState) == 1, "ParserState objects include padding!");
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} // namespace Carbon
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#endif // CARBON_TOOLCHAIN_PARSER_PARSER_STATE_H_
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