mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 22:02:23 +01:00
Jon Ross-Perkins
add31eb4e3
This builds on the series of changes to NodeKinds, aiming to simplify the NodeKind implementation a little, also making it clearer that there's a single associated token for each parse node (or, for placeholders/invalid parses, not validated). Note that prior to the relevant changes, there were nodes with multiple tokens. This change is also locking in the approach of one token per parse node, by refactoring macros to stop supporting multiple.
56 lines
1.8 KiB
C++
56 lines
1.8 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_PARSE_NODE_KIND_H_
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#define CARBON_TOOLCHAIN_PARSE_NODE_KIND_H_
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#include <cstdint>
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#include "common/enum_base.h"
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#include "toolchain/lex/token_kind.h"
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namespace Carbon::Parse {
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CARBON_DEFINE_RAW_ENUM_CLASS(NodeKind, uint8_t) {
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#define CARBON_PARSE_NODE_KIND(Name) CARBON_RAW_ENUM_ENUMERATOR(Name)
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#include "toolchain/parse/node_kind.def"
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};
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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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class NodeKind : public CARBON_ENUM_BASE(NodeKind) {
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public:
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#define CARBON_PARSE_NODE_KIND(Name) CARBON_ENUM_CONSTANT_DECL(Name)
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#include "toolchain/parse/node_kind.def"
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// Validates that a `parse_node_kind` parser node can be generated for a
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// `lex_token_kind` lexer token.
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auto CheckMatchesTokenKind(Lex::TokenKind lex_token_kind, bool has_error)
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-> void;
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// Returns true if the node is bracketed; otherwise, child_count is used.
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auto has_bracket() const -> bool;
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// Returns the bracketing node kind for the current node kind. Requires that
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// has_bracket is true.
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auto bracket() const -> NodeKind;
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// Returns the number of children that the node must have, often 0. Requires
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// that has_bracket is false.
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auto child_count() const -> int32_t;
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using EnumBase::Create;
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};
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#define CARBON_PARSE_NODE_KIND(Name) \
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CARBON_ENUM_CONSTANT_DEFINITION(NodeKind, Name)
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#include "toolchain/parse/node_kind.def"
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// We expect the parse node kind to fit compactly into 8 bits.
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static_assert(sizeof(NodeKind) == 1, "Kind objects include padding!");
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} // namespace Carbon::Parse
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#endif // CARBON_TOOLCHAIN_PARSE_NODE_KIND_H_
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