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NSString: implement NSString.StringTransform #2090

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Merged
merged 1 commit into from
Apr 11, 2019
Merged

NSString: implement NSString.StringTransform #2090

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60 changes: 58 additions & 2 deletions Foundation/NSString.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -109,6 +109,62 @@ extension NSString {
}
}

extension NSString {
public struct StringTransform: Equatable, Hashable, RawRepresentable {
typealias RawType = String

public let rawValue: String

public var hashValue: Int {
return self.rawValue.hashValue
}

public static func ==(_ lhs: StringTransform, _ rhs: StringTransform) -> Bool {
return lhs.rawValue == rhs.rawValue
}

public init(_ rawValue: String) {
self.rawValue = rawValue
}

public init(rawValue: String) {
self.rawValue = rawValue
}
}
}

// Transliteration
extension NSString.StringTransform {
public static let toLatin: NSString.StringTransform = NSString.StringTransform(rawValue: kCFStringTransformToLatin! as! String)
public static let latinToArabic: NSString.StringTransform = NSString.StringTransform(rawValue: kCFStringTransformLatinArabic! as! String)
public static let latinToCyrillic: NSString.StringTransform = NSString.StringTransform(rawValue: kCFStringTransformLatinCyrillic! as! String)
public static let latinToGreen: NSString.StringTransform = NSString.StringTransform(rawValue: kCFStringTransformLatinGreek! as! String)
public static let latinToHangul: NSString.StringTransform = NSString.StringTransform(rawValue: kCFStringTransformLatinHangul! as! String)
public static let latinToHebrew: NSString.StringTransform = NSString.StringTransform(rawValue: kCFStringTransformLatinHebrew! as! String)
public static let latinToHiragana: NSString.StringTransform = NSString.StringTransform(rawValue: kCFStringTransformLatinHiragana! as! String)
public static let latinToKatakana: NSString.StringTransform = NSString.StringTransform(rawValue: kCFStringTransformLatinKatakana! as! String)
public static let latinToThai: NSString.StringTransform = NSString.StringTransform(rawValue: kCFStringTransformLatinThai! as! String)
public static let hiraganaToKatakana: NSString.StringTransform = NSString.StringTransform(rawValue: kCFStringTransformHiraganaKatakana! as! String)
public static let mandarinToLatin: NSString.StringTransform = NSString.StringTransform(rawValue: kCFStringTransformMandarinLatin! as! String)
}

// Diacritic and Combining Mark Removal
extension NSString.StringTransform {
public static let stripDiacritics: NSString.StringTransform = NSString.StringTransform(rawValue: kCFStringTransformStripDiacritics! as! String)
public static let stripCombiningMarks: NSString.StringTransform = NSString.StringTransform(rawValue: kCFStringTransformStripCombiningMarks! as! String)
}

// Halfwidth and Fullwidth Form Conversion
extension NSString.StringTransform {
public static let fullwidthToHalfwidth: NSString.StringTransform = NSString.StringTransform(rawValue: kCFStringTransformFullwidthHalfwidth! as! String)
}

// Character Representation
extension NSString.StringTransform {
public static let toUnicodeName: NSString.StringTransform = NSString.StringTransform(rawValue: kCFStringTransformToUnicodeName! as! String)
public static let toXMLHex: NSString.StringTransform = NSString.StringTransform(rawValue: kCFStringTransformToXMLHex! as! String)
}

internal func _createRegexForPattern(_ pattern: String, _ options: NSRegularExpression.Options) -> NSRegularExpression? {
struct local {
static let __NSRegularExpressionCache: NSCache<NSString, NSRegularExpression> = {
Expand Down Expand Up @@ -1113,10 +1169,10 @@ extension NSString {
return str._swiftObject
}

open func applyingTransform(_ transform: String, reverse: Bool) -> String? {
open func applyingTransform(_ transform: StringTransform, reverse: Bool) -> String? {
let string = CFStringCreateMutable(kCFAllocatorSystemDefault, 0)!
CFStringReplaceAll(string, _cfObject)
if (CFStringTransform(string, nil, transform._cfObject, reverse)) {
if (CFStringTransform(string, nil, transform.rawValue._cfObject, reverse)) {
return string._swiftObject
} else {
return nil
Expand Down