mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 22:02:23 +01:00
Chandler Carruth
8f8ab23a77
This should clean up our top level directory and the build patterns. No non-mechanical edits here. Just injecting `toolchain/` and `TOOLCHAIN_` and then running formatting tools.
75 lines
2.7 KiB
C++
75 lines
2.7 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 TOOLCHAIN_PARSER_PARSE_NODE_KIND_H_
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#define TOOLCHAIN_PARSER_PARSE_NODE_KIND_H_
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#include <cstdint>
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#include <iterator>
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#include "llvm/ADT/StringRef.h"
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namespace Carbon {
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// A class wrapping an enumeration of the different kinds of nodes in the parse
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// tree.
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//
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// Rather than using a raw enumerator for each distinct kind of node produced by
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// the parser, we wrap the enumerator in a class to expose a more rich API
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// including bidirectional mappings to string spellings of the different kinds
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// and any relevant classification.
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//
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// Instances of this type should always be created using the `constexpr` static
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// member functions. These instances are designed specifically to be usable in
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// `case` labels of `switch` statements just like an enumerator would.
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class ParseNodeKind {
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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 KindEnum : uint8_t {
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#define CARBON_PARSE_NODE_KIND(Name) Name,
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#include "toolchain/parser/parse_node_kind.def"
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};
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public:
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// The formatting for this macro is weird due to a `clang-format` bug. See
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// https://bugs.llvm.org/show_bug.cgi?id=48320 for details.
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#define CARBON_PARSE_NODE_KIND(Name) \
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static constexpr auto Name()->ParseNodeKind { \
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return ParseNodeKind(KindEnum::Name); \
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}
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#include "toolchain/parser/parse_node_kind.def"
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// The default constructor is deleted as objects of this type should always be
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// constructed using the above factory functions for each unique kind.
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ParseNodeKind() = delete;
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friend auto operator==(ParseNodeKind lhs, ParseNodeKind rhs) -> bool {
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return lhs.kind == rhs.kind;
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}
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friend auto operator!=(ParseNodeKind lhs, ParseNodeKind rhs) -> bool {
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return lhs.kind != rhs.kind;
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}
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// Gets a friendly name for the token for logging or debugging.
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[[nodiscard]] auto GetName() 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.
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// NOLINTNEXTLINE(google-explicit-constructor)
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constexpr operator KindEnum() const { return kind; }
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private:
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constexpr explicit ParseNodeKind(KindEnum k) : kind(k) {}
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KindEnum kind;
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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(ParseNodeKind) == 1, "Kind objects include padding!");
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} // namespace Carbon
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#endif // TOOLCHAIN_PARSER_PARSE_NODE_KIND_H_
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