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carbon-lang/toolchain/parse/node_kind.def
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josh11bandRichard Smith a112f2e802 Validate parse nodes correspond to expected tokens (#3295) 
Can specify which tokens are allowed generally, and any additional
tokens that only occur when the parse node has an error.

---------

Co-authored-by: Richard Smith <richard@metafoo.co.uk>
2023-10-13 21:44:51 +00:00

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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// This is an X-macro header. It does not use `#include` guards, and instead is
// designed to be `#include`ed after the x-macro is defined in order for its
// inclusion to expand to the desired output. Macro definitions are cleaned up
// at the end of this file.
//
// Supported x-macros are:
// - CARBON_PARSE_NODE_KIND(Name)
// Used as a fallback if other macros are missing. No kinds should use this
// directly.
// - CARBON_PARSE_NODE_KIND_BRACKET(Name, BracketName, LexTokenKinds)
// Defines a bracketed node kind. BracketName should refer to the node
// kind that is the _start_ of the bracketed range.
// - CARBON_PARSE_NODE_KIND_CHILD_COUNT(Name, ChildCount, LexTokenKinds)
// Defines a parse node with a set number of children, often 0. This count
// must be correct even when the node contains errors.
//
// In both cases, LexTokenKinds says which Lex::TokenKind values that this
// parse node can correspond to, and is a sequence of:
// - CARBON_TOKEN(kind): This node can correspond to this kind of token.
// - CARBON_ANY_TOKEN: This node can correspond to any token.
// - CARBON_IF_ERROR(LexTokenKinds): This node can additionally correspond
// to the given kinds of tokens if its `has_error` flag is set.
//
// This tree represents the subset relationship between these macros, where if a
// specific x-macro isn't defined, it'll fall back to the parent macro.
//
// Parse nodes are clustered based on language feature. Comments will show their
// relationship in postorder, using indentation for child node relationships.
#if !(defined(CARBON_PARSE_NODE_KIND) || \
(defined(CARBON_PARSE_NODE_KIND_BRACKET) && \
defined(CARBON_PARSE_NODE_KIND_CHILD_COUNT)))
#error "Must define CARBON_PARSE_NODE_KIND family x-macros to use this file."
#endif
// The BRACKET and CHILD_COUNT macros will use CARBON_PARSE_NODE_KIND by default
// when undefined.
#ifndef CARBON_PARSE_NODE_KIND_BRACKET
#define CARBON_PARSE_NODE_KIND_BRACKET(Name, ...) CARBON_PARSE_NODE_KIND(Name)
#endif
#ifndef CARBON_PARSE_NODE_KIND_CHILD_COUNT
#define CARBON_PARSE_NODE_KIND_CHILD_COUNT(Name, ...) \
CARBON_PARSE_NODE_KIND(Name)
#endif
// The start of the file.
CARBON_PARSE_NODE_KIND_CHILD_COUNT(FileStart, 0, CARBON_TOKEN(StartOfFile))
// The end of the file.
CARBON_PARSE_NODE_KIND_CHILD_COUNT(FileEnd, 0, CARBON_TOKEN(EndOfFile))
// An invalid parse. Used to balance the parse tree. Always has an error.
CARBON_PARSE_NODE_KIND_CHILD_COUNT(InvalidParse, 0,
CARBON_IF_ERROR(CARBON_ANY_TOKEN))
// An empty declaration, such as `;`.
CARBON_PARSE_NODE_KIND_CHILD_COUNT(EmptyDeclaration, 0,
CARBON_TOKEN(Semi)
CARBON_IF_ERROR(CARBON_ANY_TOKEN))
// A name in a non-expression context, such as a declaration.
CARBON_PARSE_NODE_KIND_CHILD_COUNT(Name, 0,
CARBON_TOKEN(Identifier)
CARBON_IF_ERROR(CARBON_ANY_TOKEN))
// A name in an expression context.
CARBON_PARSE_NODE_KIND_CHILD_COUNT(NameExpression, 0, CARBON_TOKEN(Identifier))
// `package`:
// PackageIntroducer
// _external_: Name
// _external_: Literal
// PackageLibrary
// PackageApi or PackageImpl
// PackageDirective
CARBON_PARSE_NODE_KIND_CHILD_COUNT(PackageIntroducer, 0, CARBON_TOKEN(Package))
CARBON_PARSE_NODE_KIND_CHILD_COUNT(PackageApi, 0, CARBON_TOKEN(Api))
CARBON_PARSE_NODE_KIND_CHILD_COUNT(PackageImpl, 0, CARBON_TOKEN(Impl))
CARBON_PARSE_NODE_KIND_CHILD_COUNT(PackageLibrary, 1, CARBON_TOKEN(Library))
CARBON_PARSE_NODE_KIND_BRACKET(PackageDirective, PackageIntroducer,
CARBON_TOKEN(Semi)
CARBON_IF_ERROR(CARBON_TOKEN(Package)))
// `namespace`:
// NamespaceStart
// _external_: Name or QualifiedDeclaration
// Namespace
CARBON_PARSE_NODE_KIND_CHILD_COUNT(NamespaceStart, 0, CARBON_TOKEN(Namespace))
CARBON_PARSE_NODE_KIND_CHILD_COUNT(Namespace, 2, CARBON_TOKEN(Semi))
// A code block:
// CodeBlockStart
// _external_: statements
// CodeBlock
CARBON_PARSE_NODE_KIND_CHILD_COUNT(CodeBlockStart, 0,
CARBON_TOKEN(OpenCurlyBrace)
CARBON_IF_ERROR(CARBON_ANY_TOKEN))
CARBON_PARSE_NODE_KIND_BRACKET(CodeBlock, CodeBlockStart,
CARBON_TOKEN(CloseCurlyBrace)
CARBON_IF_ERROR(CARBON_ANY_TOKEN))
// `fn`:
// FunctionIntroducer
// _external_: Name or QualifiedDeclaration
// _external_: ParameterList
// _external_: type expression
// ReturnType
// FunctionDefinitionStart
// _external_: statements
// FunctionDefinition
//
// The above is the structure for a definition; for a declaration,
// FunctionDefinitionStart and later nodes are removed and replaced by
// FunctionDeclaration.
CARBON_PARSE_NODE_KIND_CHILD_COUNT(FunctionIntroducer, 0, CARBON_TOKEN(Fn))
CARBON_PARSE_NODE_KIND_CHILD_COUNT(ReturnType, 1, CARBON_TOKEN(MinusGreater))
CARBON_PARSE_NODE_KIND_BRACKET(FunctionDefinitionStart, FunctionIntroducer,
CARBON_TOKEN(OpenCurlyBrace))
CARBON_PARSE_NODE_KIND_BRACKET(FunctionDefinition, FunctionDefinitionStart,
CARBON_TOKEN(CloseCurlyBrace))
CARBON_PARSE_NODE_KIND_BRACKET(FunctionDeclaration, FunctionIntroducer,
CARBON_TOKEN(Semi)
CARBON_IF_ERROR(CARBON_TOKEN(Fn)))
// A parameter list, possibly deduced:
// [Deduced]ParamertListStart
// _external_: [Generic]PatternBinding
// ParameterListComma
// [Deduced]ParameterList
//
// Expressions and ParameterListComma may repeat with ParameterListComma as a
// separator.
CARBON_PARSE_NODE_KIND_CHILD_COUNT(ParameterListStart, 0,
CARBON_TOKEN(OpenParen))
CARBON_PARSE_NODE_KIND_CHILD_COUNT(DeducedParameterListStart, 0,
CARBON_TOKEN(OpenSquareBracket))
CARBON_PARSE_NODE_KIND_CHILD_COUNT(ParameterListComma, 0, CARBON_TOKEN(Comma))
CARBON_PARSE_NODE_KIND_BRACKET(ParameterList, ParameterListStart,
CARBON_TOKEN(CloseParen))
CARBON_PARSE_NODE_KIND_BRACKET(DeducedParameterList, DeducedParameterListStart,
CARBON_TOKEN(CloseSquareBracket))
// An array type, such as `[i32; 3]` or `[i32;]`:
// ArrayExpressionStart
// _external_: type expression
// ArrayExpressionSemi
// _external_: expression
// ArrayExpression
//
// The bound expression is optional.
CARBON_PARSE_NODE_KIND_CHILD_COUNT(ArrayExpressionStart, 0,
CARBON_TOKEN(OpenSquareBracket))
// May be associated with a `]` token on error.
CARBON_PARSE_NODE_KIND_CHILD_COUNT(
ArrayExpressionSemi, 2,
CARBON_TOKEN(Semi) CARBON_IF_ERROR(CARBON_TOKEN(CloseSquareBracket)))
CARBON_PARSE_NODE_KIND_BRACKET(ArrayExpression, ArrayExpressionSemi,
CARBON_TOKEN(CloseSquareBracket))
// A pattern binding, such as `name: Type`:
// Name
// _external_: type expression
// [Generic]PatternBinding
//
// Address and Template may be parents to [Generic]PatternBinding, in that
// order.
CARBON_PARSE_NODE_KIND_CHILD_COUNT(PatternBinding, 2,
CARBON_TOKEN(Colon)
CARBON_IF_ERROR(CARBON_ANY_TOKEN))
CARBON_PARSE_NODE_KIND_CHILD_COUNT(GenericPatternBinding, 2,
CARBON_TOKEN(ColonExclaim))
CARBON_PARSE_NODE_KIND_CHILD_COUNT(Address, 1, CARBON_TOKEN(Addr))
CARBON_PARSE_NODE_KIND_CHILD_COUNT(Template, 1, CARBON_TOKEN(Template))
// `let`:
// LetIntroducer
// _external_: PatternBinding
// LetInitializer
// _external_: expression
// LetDeclaration
CARBON_PARSE_NODE_KIND_CHILD_COUNT(LetIntroducer, 0, CARBON_TOKEN(Let))
CARBON_PARSE_NODE_KIND_CHILD_COUNT(LetInitializer, 0, CARBON_TOKEN(Equal))
CARBON_PARSE_NODE_KIND_BRACKET(LetDeclaration, LetIntroducer,
CARBON_TOKEN(Semi))
// `var`:
// VariableIntroducer
// _external_: PatternBinding
// optional VariableInitializer
// optional _external_: expression
// VariableDeclaration
//
// The VariableInitializer and following expression are paired: either both will
// be present, or neither will.
CARBON_PARSE_NODE_KIND_CHILD_COUNT(VariableIntroducer, 0, CARBON_TOKEN(Var))
CARBON_PARSE_NODE_KIND_CHILD_COUNT(VariableInitializer, 0, CARBON_TOKEN(Equal))
CARBON_PARSE_NODE_KIND_BRACKET(VariableDeclaration, VariableIntroducer,
CARBON_TOKEN(Semi)
CARBON_IF_ERROR(CARBON_TOKEN(Var)))
// An expression statement:
// _external_: expression
// ExpressionStatement
CARBON_PARSE_NODE_KIND_CHILD_COUNT(ExpressionStatement, 1, CARBON_TOKEN(Semi))
// `break`:
// BreakStatementStart
// BreakStatement
CARBON_PARSE_NODE_KIND_CHILD_COUNT(BreakStatementStart, 0, CARBON_TOKEN(Break))
CARBON_PARSE_NODE_KIND_CHILD_COUNT(BreakStatement, 1,
CARBON_TOKEN(Semi)
CARBON_IF_ERROR(CARBON_TOKEN(Break)))
// `continue`:
// ContinueStatementStart
// ContinueStatement
CARBON_PARSE_NODE_KIND_CHILD_COUNT(ContinueStatementStart, 0,
CARBON_TOKEN(Continue))
CARBON_PARSE_NODE_KIND_CHILD_COUNT(ContinueStatement, 1,
CARBON_TOKEN(Semi)
CARBON_IF_ERROR(CARBON_TOKEN(Continue)))
// `return`:
// ReturnStatementStart
// _external_: expression
// ReturnStatement
//
// The child expression is optional.
CARBON_PARSE_NODE_KIND_CHILD_COUNT(ReturnStatementStart, 0,
CARBON_TOKEN(Return))
CARBON_PARSE_NODE_KIND_BRACKET(ReturnStatement, ReturnStatementStart,
CARBON_TOKEN(Semi)
CARBON_IF_ERROR(CARBON_TOKEN(Return)))
// `for`:
// ForHeaderStart
// VariableIntroducer
// _external_: PatternBinding
// _external_: type expression
// ForIn
// _external_: expression
// ForHeader
// _external_: CodeBlock
// ForStatement
//
// Versus a normal `var`, ForIn replaces VariableDeclaration.
CARBON_PARSE_NODE_KIND_CHILD_COUNT(ForHeaderStart, 0,
CARBON_TOKEN(OpenParen)
CARBON_IF_ERROR(CARBON_TOKEN(For)))
CARBON_PARSE_NODE_KIND_BRACKET(ForIn, VariableIntroducer,
CARBON_TOKEN(In)
CARBON_IF_ERROR(CARBON_ANY_TOKEN))
CARBON_PARSE_NODE_KIND_BRACKET(ForHeader, ForHeaderStart,
CARBON_TOKEN(CloseParen)
CARBON_IF_ERROR(CARBON_TOKEN(For)))
CARBON_PARSE_NODE_KIND_CHILD_COUNT(ForStatement, 2, CARBON_TOKEN(For))
// `if` statement + `else`:
// IfConditionStart
// _external_: expression
// IfCondition
// _external_: CodeBlock
// IfStatementElse
// _external_: CodeBlock or IfStatement
// IfStatement
//
// IfStatementElse and the following node are optional based on `else` presence.
CARBON_PARSE_NODE_KIND_CHILD_COUNT(IfConditionStart, 0,
CARBON_TOKEN(OpenParen)
CARBON_IF_ERROR(CARBON_TOKEN(If)))
CARBON_PARSE_NODE_KIND_BRACKET(IfCondition, IfConditionStart,
CARBON_TOKEN(CloseParen)
CARBON_IF_ERROR(CARBON_TOKEN(If)))
CARBON_PARSE_NODE_KIND_CHILD_COUNT(IfStatementElse, 0, CARBON_TOKEN(Else))
CARBON_PARSE_NODE_KIND_BRACKET(IfStatement, IfCondition, CARBON_TOKEN(If))
// `while`:
// WhileConditionStart
// _external_: expression
// WhileCondition
// _external_: CodeBlock
// WhileStatement
CARBON_PARSE_NODE_KIND_CHILD_COUNT(WhileConditionStart, 0,
CARBON_TOKEN(OpenParen))
CARBON_PARSE_NODE_KIND_BRACKET(WhileCondition, WhileConditionStart,
CARBON_TOKEN(CloseParen))
CARBON_PARSE_NODE_KIND_CHILD_COUNT(WhileStatement, 2, CARBON_TOKEN(While))
// Index expressions, such as `a[1]`:
// _external_: expression
// IndexExpressionStart
// _external_: expression
// IndexExpression
CARBON_PARSE_NODE_KIND_CHILD_COUNT(IndexExpressionStart, 1,
CARBON_TOKEN(OpenSquareBracket))
CARBON_PARSE_NODE_KIND_BRACKET(IndexExpression, IndexExpressionStart,
CARBON_TOKEN(CloseSquareBracket))
// Parenthesized expressions, such as `(2)`:
// ParenExpressionOrTupleLiteralStart
// _external_: expression
// ParenExpression
//
// Tuples, such as `(1, 2)`:
// ParenExpressionOrTupleLiteralStart
// _external_: expression
// TupleLiteralComma
// TupleLiteral
//
// Expressions and TupleLiteralComma may repeat with TupleLiteralComma as a
// separator.
CARBON_PARSE_NODE_KIND_CHILD_COUNT(ParenExpressionOrTupleLiteralStart, 0,
CARBON_TOKEN(OpenParen))
CARBON_PARSE_NODE_KIND_BRACKET(ParenExpression,
ParenExpressionOrTupleLiteralStart,
CARBON_TOKEN(CloseParen))
CARBON_PARSE_NODE_KIND_CHILD_COUNT(TupleLiteralComma, 0, CARBON_TOKEN(Comma))
CARBON_PARSE_NODE_KIND_BRACKET(TupleLiteral, ParenExpressionOrTupleLiteralStart,
CARBON_TOKEN(CloseParen))
// Call expressions, such as `a()`:
// _external_: expression
// CallExpressionStart
// _external_: expression
// CallExpressionComma
// CallExpression
//
// Expressions and CallExpressionComma may repeat with CallExpressionComma as a
// separator.
CARBON_PARSE_NODE_KIND_CHILD_COUNT(CallExpressionStart, 1,
CARBON_TOKEN(OpenParen))
CARBON_PARSE_NODE_KIND_CHILD_COUNT(CallExpressionComma, 0, CARBON_TOKEN(Comma))
CARBON_PARSE_NODE_KIND_BRACKET(CallExpression, CallExpressionStart,
CARBON_TOKEN(CloseParen))
// A qualified declaration, such as `a.b`:
// _external_: NameExpression or QualifiedDeclaration
// _external_: Name
// QualifiedDeclaration
//
// TODO: This will eventually more general expressions, for example with
// `GenericType(type_args).ChildType(child_type_args).Name`.
CARBON_PARSE_NODE_KIND_CHILD_COUNT(QualifiedDeclaration, 2,
CARBON_TOKEN(Period))
// A member access expression, such as `a.b` or
// `GetObject().(Interface.member)`:
// _external_: lhs expression
// _external_: rhs expression
// QualifiedExpression
CARBON_PARSE_NODE_KIND_CHILD_COUNT(MemberAccessExpression, 2,
CARBON_TOKEN(Period))
// A pointer member access expression, such as `a->b` or
// `GetObject()->(Interface.member)`:
// _external_: lhs expression
// _external_: rhs expression
// QualifiedExpression
CARBON_PARSE_NODE_KIND_CHILD_COUNT(PointerMemberAccessExpression, 2,
CARBON_TOKEN(MinusGreater))
// clang-format off
// A literal.
CARBON_PARSE_NODE_KIND_CHILD_COUNT(Literal, 0,
CARBON_TOKEN(False)
CARBON_TOKEN(True)
CARBON_TOKEN(IntegerLiteral)
CARBON_TOKEN(RealLiteral)
CARBON_TOKEN(StringLiteral)
CARBON_TOKEN(Bool)
CARBON_TOKEN(IntegerTypeLiteral)
CARBON_TOKEN(UnsignedIntegerTypeLiteral)
CARBON_TOKEN(FloatingPointTypeLiteral)
CARBON_TOKEN(StringTypeLiteral)
CARBON_TOKEN(Type))
// A prefix operator:
// _external_: expression
// PrefixOperator
CARBON_PARSE_NODE_KIND_CHILD_COUNT(PrefixOperator, 1,
CARBON_TOKEN(Star)
CARBON_TOKEN(Amp)
CARBON_TOKEN(Not)
CARBON_TOKEN(Minus)
CARBON_TOKEN(MinusMinus)
CARBON_TOKEN(PlusPlus)
CARBON_TOKEN(Caret)
CARBON_TOKEN(Const))
// An infix operator:
// _external_: lhs expression
// _external_: rhs expression
// InfixOperator
CARBON_PARSE_NODE_KIND_CHILD_COUNT(InfixOperator, 2,
CARBON_TOKEN(Amp)
CARBON_TOKEN(AmpEqual)
CARBON_TOKEN(And)
CARBON_TOKEN(As)
CARBON_TOKEN(Caret)
CARBON_TOKEN(CaretEqual)
CARBON_TOKEN(Equal)
CARBON_TOKEN(EqualEqual)
CARBON_TOKEN(ExclaimEqual)
CARBON_TOKEN(Greater)
CARBON_TOKEN(GreaterEqual)
CARBON_TOKEN(GreaterGreater)
CARBON_TOKEN(GreaterGreaterEqual)
CARBON_TOKEN(Less)
CARBON_TOKEN(LessEqual)
CARBON_TOKEN(LessLess)
CARBON_TOKEN(LessLessEqual)
CARBON_TOKEN(Minus)
CARBON_TOKEN(MinusEqual)
CARBON_TOKEN(Or)
CARBON_TOKEN(Percent)
CARBON_TOKEN(PercentEqual)
CARBON_TOKEN(Pipe)
CARBON_TOKEN(PipeEqual)
CARBON_TOKEN(Plus)
CARBON_TOKEN(PlusEqual)
CARBON_TOKEN(Slash)
CARBON_TOKEN(SlashEqual)
CARBON_TOKEN(Star)
CARBON_TOKEN(StarEqual))
// clang-format on
// The first operand of a short-circuiting infix operator:
// _external_: expression
// ShortCircuitOperand
// _external_: expression
// _external_: InfixOperator
CARBON_PARSE_NODE_KIND_CHILD_COUNT(ShortCircuitOperand, 1,
CARBON_TOKEN(And) CARBON_TOKEN(Or))
// A postfix operator:
// _external_: expression
// PostfixOperator
CARBON_PARSE_NODE_KIND_CHILD_COUNT(PostfixOperator, 1, CARBON_TOKEN(Star))
// `if` expression + `then` + `else`:
// _external_: expression
// IfExpressionIf
// _external_: expression
// IfExpressionThen
// _external_: expression
// IfExpressionElse
CARBON_PARSE_NODE_KIND_CHILD_COUNT(IfExpressionIf, 1, CARBON_TOKEN(If))
CARBON_PARSE_NODE_KIND_CHILD_COUNT(IfExpressionThen, 1, CARBON_TOKEN(Then))
CARBON_PARSE_NODE_KIND_CHILD_COUNT(IfExpressionElse, 3,
CARBON_TOKEN(Else)
CARBON_IF_ERROR(CARBON_TOKEN(If)))
// Struct literals, such as `{.a = 0}`:
// StructLiteralOrStructTypeLiteralStart
// _external_: Name
// StructFieldDesignator
// _external_: expression
// StructFieldValue
// StructComma
// StructLiteral
//
// Struct type literals, such as `{.a: i32}`:
// _external_: Name
// StructFieldDesignator
// _external_: type expression
// StructFieldType
// StructComma
// StructTypeLiteral
//
// Elements (StructFieldValue and StructFieldType, respectively) and StructComma
// may repeat with StructComma as a separator.
//
// When a valid StructFieldType or StructFieldValue cannot be formed, elements
// may be replaced by StructFieldUnknown, which may have a preceding sibling
// StructFieldDesignator if one was successfully parsed.
CARBON_PARSE_NODE_KIND_CHILD_COUNT(StructLiteralOrStructTypeLiteralStart, 0,
CARBON_TOKEN(OpenCurlyBrace))
CARBON_PARSE_NODE_KIND_CHILD_COUNT(StructFieldDesignator, 1,
CARBON_TOKEN(Period))
CARBON_PARSE_NODE_KIND_CHILD_COUNT(StructFieldValue, 2, CARBON_TOKEN(Equal))
CARBON_PARSE_NODE_KIND_CHILD_COUNT(StructFieldType, 2, CARBON_TOKEN(Colon))
CARBON_PARSE_NODE_KIND_CHILD_COUNT(StructFieldUnknown, 0,
CARBON_IF_ERROR(CARBON_ANY_TOKEN))
CARBON_PARSE_NODE_KIND_CHILD_COUNT(StructComma, 0, CARBON_TOKEN(Comma))
CARBON_PARSE_NODE_KIND_BRACKET(StructLiteral,
StructLiteralOrStructTypeLiteralStart,
CARBON_TOKEN(CloseCurlyBrace))
CARBON_PARSE_NODE_KIND_BRACKET(StructTypeLiteral,
StructLiteralOrStructTypeLiteralStart,
CARBON_TOKEN(CloseCurlyBrace))
// `class`:
// ClassIntroducer
// _external_: Name or QualifiedDeclaration
// ClassDefinitionStart
// _external_: declarations
// ClassDefinition
//
// The above is the structure for a definition; for a declaration,
// ClassDefinitionStart and later nodes are removed and replaced by
// ClassDeclaration.
CARBON_PARSE_NODE_KIND_CHILD_COUNT(ClassIntroducer, 0, CARBON_TOKEN(Class))
CARBON_PARSE_NODE_KIND_BRACKET(ClassDefinitionStart, ClassIntroducer,
CARBON_TOKEN(OpenCurlyBrace))
CARBON_PARSE_NODE_KIND_BRACKET(ClassDefinition, ClassDefinitionStart,
CARBON_TOKEN(CloseCurlyBrace))
CARBON_PARSE_NODE_KIND_BRACKET(ClassDeclaration, ClassIntroducer,
CARBON_TOKEN(Semi)
CARBON_IF_ERROR(CARBON_TOKEN(Class)))
// `interface`:
// InterfaceIntroducer
// _external_: Name or QualifiedDeclaration
// InterfaceDefinitionStart
// _external_: declarations
// InterfaceDefinition
//
// The above is the structure for a definition; for a declaration,
// InterfaceDefinitionStart and later nodes are removed and replaced by
// InterfaceDeclaration.
CARBON_PARSE_NODE_KIND_CHILD_COUNT(InterfaceIntroducer, 0,
CARBON_TOKEN(Interface))
CARBON_PARSE_NODE_KIND_BRACKET(InterfaceDefinitionStart, InterfaceIntroducer,
CARBON_TOKEN(OpenCurlyBrace))
CARBON_PARSE_NODE_KIND_BRACKET(InterfaceDefinition, InterfaceDefinitionStart,
CARBON_TOKEN(CloseCurlyBrace))
CARBON_PARSE_NODE_KIND_BRACKET(InterfaceDeclaration, InterfaceIntroducer,
CARBON_TOKEN(Semi)
CARBON_IF_ERROR(CARBON_TOKEN(Interface)))
// `constraint`:
// NamedConstraintIntroducer
// _external_: Name or QualifiedDeclaration
// NamedConstraintDefinitionStart
// _external_: declarations
// NamedConstraintDefinition
//
// The above is the structure for a definition; for a declaration,
// NamedConstraintDefinitionStart and later nodes are removed and replaced by
// NamedConstraintDeclaration.
CARBON_PARSE_NODE_KIND_CHILD_COUNT(NamedConstraintIntroducer, 0,
CARBON_TOKEN(Constraint))
CARBON_PARSE_NODE_KIND_BRACKET(NamedConstraintDefinitionStart,
NamedConstraintIntroducer,
CARBON_TOKEN(OpenCurlyBrace))
CARBON_PARSE_NODE_KIND_BRACKET(NamedConstraintDefinition,
NamedConstraintDefinitionStart,
CARBON_TOKEN(CloseCurlyBrace))
CARBON_PARSE_NODE_KIND_BRACKET(NamedConstraintDeclaration,
NamedConstraintIntroducer, CARBON_TOKEN(Semi))
// The `self` value and `Self` type identifier keywords. Typically of the form
// `self: Self`:
// SelfValueName
// SelfTypeNameExpression
// PatternBinding
CARBON_PARSE_NODE_KIND_CHILD_COUNT(SelfValueName, 0,
CARBON_TOKEN(SelfValueIdentifier))
CARBON_PARSE_NODE_KIND_CHILD_COUNT(SelfTypeNameExpression, 0,
CARBON_TOKEN(SelfTypeIdentifier))
#undef CARBON_PARSE_NODE_KIND
#undef CARBON_PARSE_NODE_KIND_BRACKET
#undef CARBON_PARSE_NODE_KIND_CHILD_COUNT
#undef CARBON_TOKEN
#undef CARBON_ANY_TOKEN
#undef CARBON_IF_ERROR
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