Petit exemple qui devrait fonctionner avec des encodages de chaînes multi-octets.
extension UInt8 {
//returns 0...15 when '0'...'9', 'A'...'F', 'a'...'f', otherwise returns nil
var hexValue: UInt8? {
if UInt8(ascii: "0") <= self && self <= UInt8(ascii: "9") {
return self - UInt8(ascii: "0")
} else if UInt8(ascii: "A") <= self && self <= UInt8(ascii: "F") {
return self - UInt8(ascii: "A") + 10
} else if UInt8(ascii: "a") <= self && self <= UInt8(ascii: "f") {
return self - UInt8(ascii: "a") + 10
} else {
return nil
}
}
}
extension String {
func removingPercentEncoding(using encoding: String.Encoding) -> String? {
guard let percentEncodedData = self.data(using: encoding) else {return nil}
var byteIterator = percentEncodedData.makeIterator()
var percentDecodedData = Data()
while let b0 = byteIterator.next() {
guard b0 == UInt8(ascii: "%"), let b1 = byteIterator.next() else {
//Non percent character
percentDecodedData.append(b0)
continue
}
guard let h1 = b1.hexValue, let b2 = byteIterator.next() else {
//Keep it as is, when invalid hex-sequece appeared
percentDecodedData.append(b0)
percentDecodedData.append(b1)
continue
}
guard let h2 = b2.hexValue else {
//Keep it as is, when invalid hex-sequece appeared
percentDecodedData.append(b0)
percentDecodedData.append(b1)
percentDecodedData.append(b2)
continue
}
percentDecodedData.append((h1<<4) + h2)
}
return String(data: percentDecodedData, encoding: encoding)
}
}
À mon avis, vous devriez penser non-UTF8 pour cent encodage est maintenant obsolète, et devrait fixer la partie qui génère la chaîne codée pour cent avec 1251.