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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
//
//===----------------------------------------------------------------------===//
import SwiftSyntax
/// Lowercases the first word in the provided camelCase or PascalCase string.
/// EOF -> eof
/// IfKeyword -> ifKeyword
/// EOFToken -> eofToken
public func lowercaseFirstWord(name: String) -> String {
var wordIndex = 0
let thresholdIndex = 1
for c in name {
if c.isLowercase {
if wordIndex > thresholdIndex {
wordIndex -= 1
}
break
}
wordIndex += 1
}
if wordIndex == 0 {
return name
}
return name.prefix(wordIndex).lowercased() + name[name.index(name.startIndex, offsetBy: wordIndex)..<name.endIndex]
}
// Helpers to create trivia pieces
extension SwiftSyntax.Trivia {
/// Make a new trivia from a (possibly multi-line) string, prepending `///`
/// to each line and creating a `.docLineComment` trivia piece for each line.
public static func docCommentTrivia(from string: String?) -> Self {
guard let string else { return [] }
let lines = string.split(separator: "\n", omittingEmptySubsequences: false).map { "/// \($0)" }
return .init(pieces: lines.flatMap { [.docLineComment($0), .newlines(1)] })
}
/// Make a new trivia by joining together ``SwiftSyntax/TriviaPiece``s from `joining`,
/// and gluing them together with pieces from `separator`.
public init(
joining items: [SwiftSyntax.Trivia],
separator: SwiftSyntax.Trivia = .init(pieces: [.docLineComment("///"), .newlines(1)])
) {
self.init(pieces: items.filter { !$0.isEmpty }.joined(separator: separator))
}
}
extension Collection {
/// If the collection contains a single element, return it, otherwise `nil`.
public var only: Element? {
if !isEmpty && index(after: startIndex) == endIndex {
return self.first!
} else {
return nil
}
}
}
extension TokenSyntax {
public var backtickedIfNeeded: TokenSyntax {
if Keyword.allCases.map(\.spec).contains(where: {
$0.name == self.description && ($0.isLexerClassified || $0.name == "Type" || $0.name == "Protocol")
}) {
return "`\(self)`"
} else {
return self
}
}
}
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