Line data    Source code

       1             : class EncodingUtils {
       2           0 :   static String getChars(Encoding encoding) {
       3           0 :     return _encodeMap[encoding]!;
       4             :   }
       5             : 
       6           0 :   static Map<String, int> getDecodeMap(Encoding encoding) {
       7           0 :     var map = _decodeMap[encoding];
       8             :     if (map != null) {
       9             :       return map;
      10             :     } else {
      11           0 :       var chars = _encodeMap[encoding]!;
      12             :       // ignore: omit_local_variable_types
      13           0 :       Map<String, int> map = {};
      14           0 :       for (var i = 0; i < 32; i++) {
      15           0 :         map[chars[i]] = i;
      16             :       }
      17           0 :       _decodeMap[encoding] = map;
      18             :       return map;
      19             :     }
      20             :   }
      21             : 
      22           0 :   static RegExp getRegex(Encoding encoding) {
      23           0 :     return _regexMap[encoding]!;
      24             :   }
      25             : 
      26           0 :   static bool getPadded(Encoding encoding) {
      27           0 :     return _padded[encoding]!;
      28             :   }
      29             : 
      30           0 :   static final _regexMap = {
      31           0 :     Encoding.standardRFC4648: RegExp(r'^[A-Z2-7=]+$'),
      32           0 :     Encoding.nonStandardRFC4648Lower: RegExp(r'^[a-z2-7=]+$'),
      33           0 :     Encoding.base32Hex: RegExp(r'^[0-9A-V=]+$'),
      34           0 :     Encoding.crockford: RegExp(r'^[0123456789ABCDEFGHJKMNPQRSTVWXYZ-]+$'),
      35           0 :     Encoding.zbase32: RegExp(r'^[ybndrfg8ejkmcpqxot1uwisza345h769]+$'),
      36           0 :     Encoding.geohash: RegExp(r'^[0123456789bcdefghjkmnpqrstuvwxyz=]+$')
      37             :   };
      38           0 :   static final _encodeMap = {
      39             :     Encoding.standardRFC4648: 'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567',
      40             :     Encoding.nonStandardRFC4648Lower: 'abcdefghijklmnopqrstuvwxyz234567',
      41             :     Encoding.base32Hex: '0123456789ABCDEFGHIJKLMNOPQRSTUV',
      42             :     Encoding.crockford: '0123456789ABCDEFGHJKMNPQRSTVWXYZ',
      43             :     Encoding.zbase32: 'ybndrfg8ejkmcpqxot1uwisza345h769',
      44             :     Encoding.geohash: '0123456789bcdefghjkmnpqrstuvwxyz'
      45             :   };
      46             : 
      47           0 :   static final Map<Encoding, Map<String, int>> _decodeMap = {};
      48             : 
      49           0 :   static final _padded = {Encoding.standardRFC4648: true, Encoding.nonStandardRFC4648Lower: true, Encoding.base32Hex: true, Encoding.crockford: false, Encoding.zbase32: false, Encoding.geohash: true};
      50             : }
      51             : 
      52             : enum Encoding { standardRFC4648, base32Hex, crockford, zbase32, geohash, nonStandardRFC4648Lower }