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//===--------------- StringAdditions.swift - Swift String Additions -------===//
//
// 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
//
//===----------------------------------------------------------------------===//
extension String {
/// Whether this string is a Swift identifier.
public var sd_isSwiftIdentifier: Bool {
guard let start = unicodeScalars.first else {
return false
}
let continuation = unicodeScalars.dropFirst()
return start.isValidSwiftIdentifierStart &&
continuation.allSatisfy { $0.isValidSwiftIdentifierContinuation }
}
}
extension DefaultStringInterpolation {
/// Interpolates either the provided `value`, or if it is `nil`, the
/// `defaultValue`.
mutating func appendInterpolation<T>(_ value: T?, or defaultValue: String) {
guard let value = value else {
return appendInterpolation(defaultValue)
}
appendInterpolation(value)
}
}
extension Unicode.Scalar {
var isValidSwiftIdentifierStart: Bool {
guard isValidSwiftIdentifierContinuation else { return false }
if isASCIIDigit || self == "$" {
return false
}
// N1518: Recommendations for extended identifier characters for C and C++
// Proposed Annex X.2: Ranges of characters disallowed initially
if (0x0300...0x036F).contains(value) ||
(0x1DC0...0x1DFF).contains(value) ||
(0x20D0...0x20FF).contains(value) ||
(0xFE20...0xFE2F).contains(value) {
return false
}
return true
}
var isValidSwiftIdentifierContinuation: Bool {
if isASCII {
return isCIdentifierBody(allowDollar: true)
}
// N1518: Recommendations for extended identifier characters for C and C++
// Proposed Annex X.1: Ranges of characters allowed
return value == 0x00A8 ||
value == 0x00AA ||
value == 0x00AD ||
value == 0x00AF ||
(0x00B2...0x00B5).contains(value) ||
(0x00B7...0x00BA).contains(value) ||
(0x00BC...0x00BE).contains(value) ||
(0x00C0...0x00D6).contains(value) ||
(0x00D8...0x00F6).contains(value) ||
(0x00F8...0x00FF).contains(value) ||
(0x0100...0x167F).contains(value) ||
(0x1681...0x180D).contains(value) ||
(0x180F...0x1FFF).contains(value) ||
(0x200B...0x200D).contains(value) ||
(0x202A...0x202E).contains(value) ||
(0x203F...0x2040).contains(value) ||
value == 0x2054 ||
(0x2060...0x206F).contains(value) ||
(0x2070...0x218F).contains(value) ||
(0x2460...0x24FF).contains(value) ||
(0x2776...0x2793).contains(value) ||
(0x2C00...0x2DFF).contains(value) ||
(0x2E80...0x2FFF).contains(value) ||
(0x3004...0x3007).contains(value) ||
(0x3021...0x302F).contains(value) ||
(0x3031...0x303F).contains(value) ||
(0x3040...0xD7FF).contains(value) ||
(0xF900...0xFD3D).contains(value) ||
(0xFD40...0xFDCF).contains(value) ||
(0xFDF0...0xFE44).contains(value) ||
(0xFE47...0xFFF8).contains(value) ||
(0x10000...0x1FFFD).contains(value) ||
(0x20000...0x2FFFD).contains(value) ||
(0x30000...0x3FFFD).contains(value) ||
(0x40000...0x4FFFD).contains(value) ||
(0x50000...0x5FFFD).contains(value) ||
(0x60000...0x6FFFD).contains(value) ||
(0x70000...0x7FFFD).contains(value) ||
(0x80000...0x8FFFD).contains(value) ||
(0x90000...0x9FFFD).contains(value) ||
(0xA0000...0xAFFFD).contains(value) ||
(0xB0000...0xBFFFD).contains(value) ||
(0xC0000...0xCFFFD).contains(value) ||
(0xD0000...0xDFFFD).contains(value) ||
(0xE0000...0xEFFFD).contains(value)
}
/// `true` if this character is an ASCII digit: [0-9]
var isASCIIDigit: Bool { (0x30...0x39).contains(value) }
/// `true` if this is a body character of a C identifier,
/// which is [a-zA-Z0-9_].
func isCIdentifierBody(allowDollar: Bool = false) -> Bool {
if (0x41...0x5A).contains(value) ||
(0x61...0x7A).contains(value) ||
isASCIIDigit ||
self == "_" {
return true
} else {
return allowDollar && self == "$"
}
}
}
extension Character {
var isShellQuote: Bool {
return self == "\"" || self == "'"
}
}
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