(Swift) JSON Escape and Unescape a String

Demonstrates how to JSON escape or unescape a string.

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func chilkatTest() {
    let sb = CkoStringBuilder()!

    sb.append("backslash: \\\\, A: \\u0041")
    print("\(sb.getAsString()!)")

    // The output is:
    //    backslash: \\, A: \u0041

    // The keyword "json" can be used
    // to escape and unescape.  To escape is to encode.  To unescape is to decode.

    // Unescape (decode) the string in sb.
    sb.decode("json", charset: "utf-8")
    print("\(sb.getAsString()!)")

    // After JSON unescaping:
    //    backslash: \, A: A

    // Now JSON escape the string.
    sb.encode("json", charset: "utf-8")
    print("\(sb.getAsString()!)")

    // After JSON escaping:
    //    backslash: \\, A: A

    // Note: The "A" is not escaped to "\u0041" because there is no need.
    // The "\uXXXX" format would be produced for non-printable control chars.

}