(Objective-C) JSON Escape and Unescape a String

Demonstrates how to JSON escape or unescape a string.

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#import <CkoStringBuilder.h>

CkoStringBuilder *sb = [[CkoStringBuilder alloc] init];

[sb Append: @"backslash: \\\\, A: \\u0041"];
NSLog(@"%@",[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"];
NSLog(@"%@",[sb GetAsString]);

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

// Now JSON escape the string.
[sb Encode: @"json" charset: @"utf-8"];
NSLog(@"%@",[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.