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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2023 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
/// Describes the statically allowed structure of a syntax tree node.
public enum SyntaxNodeStructure: Sendable {
public enum SyntaxChoice: Sendable {
case node(SyntaxProtocol.Type)
case token(TokenKind)
}
/// The node contains a fixed number of children which can be accessed by these key paths.
case layout([AnyKeyPath & Sendable])
/// The node is a `SyntaxCollection` of the given type.
case collection(SyntaxProtocol.Type)
/// The node can contain a single node with one of the listed types.
case choices([SyntaxChoice])
/// Convenience property that’s `true` if `self` is the `layout` case.
public var isLayout: Bool {
switch self {
case .layout: return true
default: return false
}
}
/// Convenience property that’s `true` if `self` is the `collection` case.
public var isCollection: Bool {
switch self {
case .collection: return true
default: return false
}
}
/// Convenience property that’s `true` if `self` is the `choices` case.
public var isChoices: Bool {
switch self {
case .choices: return true
default: return false
}
}
}
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