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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
//
//===----------------------------------------------------------------------===//
#if swift(>=6)
internal import SwiftBasicFormat
@_spi(RawSyntax) internal import SwiftSyntax
#else
import SwiftBasicFormat
@_spi(RawSyntax) import SwiftSyntax
#endif
/// Walks a tree and checks whether the tree contained any present tokens.
class PresentNodeChecker: SyntaxAnyVisitor {
var hasPresentToken: Bool = false
override func visitAny(_ node: Syntax) -> SyntaxVisitorContinueKind {
if hasPresentToken {
// If we already saw a present token, we don't need to continue.
return .skipChildren
} else {
return .visitChildren
}
}
override func visit(_ node: TokenSyntax) -> SyntaxVisitorContinueKind {
if node.isPresent {
hasPresentToken = true
}
return .visitChildren
}
}
extension SyntaxProtocol {
/// Returns `true` if all tokens nodes in this tree are missing.
var isMissingAllTokens: Bool {
let checker = PresentNodeChecker(viewMode: .all)
checker.walk(Syntax(self))
return !checker.hasPresentToken
}
}
/// Transforms a syntax tree by making all present tokens missing.
class MissingMaker: SyntaxRewriter {
init() {
super.init(viewMode: .sourceAccurate)
}
override func visit(_ node: TokenSyntax) -> TokenSyntax {
guard node.isPresent else {
return node
}
return TokenSyntax(node.tokenKind, presence: .missing)
}
}
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