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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2019 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
//
//===----------------------------------------------------------------------===//
import SwiftSyntax
struct SyntaxAncestorIterator: IteratorProtocol {
private var node: Syntax
fileprivate init(_ node: Syntax) {
self.node = node
}
mutating func next() -> Syntax? {
if let parent = node.parent {
node = parent
return node
}
return nil
}
}
struct SyntaxAncestors: Sequence {
private let node: Syntax
fileprivate init(_ node: Syntax) {
self.node = node
}
func makeIterator() -> SyntaxAncestorIterator {
return SyntaxAncestorIterator(node)
}
}
extension SyntaxProtocol {
var ancestors: SyntaxAncestors {
return SyntaxAncestors(Syntax(self))
}
}
extension TokenSyntax {
var isOperator: Bool {
switch tokenKind {
case .prefixOperator, .postfixOperator, .binaryOperator, .equal:
return true
default:
return false
}
}
var pieces: (leadingTrivia: String, content: String, trailingTrivia: String) {
let text = description.utf8
let leadingTrivia = String(text.prefix(leadingTriviaLength.utf8Length))!
let content = String(text.dropFirst(leadingTriviaLength.utf8Length).dropLast(trailingTriviaLength.utf8Length))!
let trailingTrivia = String(text.suffix(trailingTriviaLength.utf8Length))!
return (leadingTrivia, content, trailingTrivia)
}
var isIdentifier: Bool {
switch tokenKind {
case .identifier: fallthrough
case .dollarIdentifier:
return true
default:
return false
}
}
var isReference: Bool {
guard isIdentifier else { return false }
guard let parent = parent else { return false }
return parent.isProtocol(ExprSyntaxProtocol.self) ||
parent.isProtocol(TypeSyntaxProtocol.self) ||
parent.is(LabeledExprSyntax.self) ||
parent.is(KeyPathPropertyComponentSyntax.self)
}
var textWithoutBackticks: String {
guard text.first == "`" && text.last == "`" else { return text }
return String(text.dropFirst().dropLast())
}
var isLiteralExprClose: Bool {
guard let parent = parent else {
return false
}
switch self.tokenKind {
case .rightParen:
return parent.is(TupleExprSyntax.self)
case .rightBrace:
return parent.is(ClosureExprSyntax.self)
case .rightSquare:
return parent.is(ArrayExprSyntax.self) || parent.is(DictionaryExprSyntax.self)
default:
return false
}
}
}
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