in lib/twitter_cldr/resources/bidi_test_importer.rb [94:120]
def types_to_string(types)
@utf_map ||= {
'L' => "\u0041",
'LRE' => "\u202a",
'LRO' => "\u202d",
'R' => "\u05be",
'AL' => "\u0626",
'RLE' => "\u202b",
'RLO' => "\u202e",
'PDF' => "\u202c",
'EN' => "\u0030",
'ET' => "\u0023",
'AN' => "\u0667",
'CS' => "\u002c",
'NSM' => "\u0300",
'BN' => "\u0000",
'B' => "\u0085",
'S' => "\u0009",
'WS' => "\u000c",
'ON' => "\u0021"
}
@utf_map['ES'] = (Character.getDirectionality(0x002b) == Character::DIRECTIONALITY_EUROPEAN_NUMBER_SEPARATOR) ? "\u002b" : "\u002f"
types.inject('') { |ret, type| ret << @utf_map[type]; ret }
end