toBlackboardBold static method

String toBlackboardBold(String text)

Converts to Blackboard Bold - \mathbb Mapping range: A-Z (U+1D538), a-z (U+1D552), 0-9 (U+1D7D8)

Implementation

static String toBlackboardBold(String text) {
  return text.runes
      .map((runes) {
        if (runes >= 65 && runes <= 90) {
          // 'A' to 'Z'
          switch (runes) {
            case 67:
              return "ℂ"; // 'C'
            case 72:
              return "ℍ"; // 'H'
            case 78:
              return "ℕ"; // 'N'
            case 80:
              return "ℙ"; // 'P'
            case 81:
              return "ℚ"; // 'Q'
            case 82:
              return "ℝ"; // 'R'
            case 90:
              return "ℤ"; // 'Z'
            default:
              return _codePointToString(0x1D538 + (runes - 65));
          }
        } else if (runes >= 97 && runes <= 122) {
          // 'a' to 'z'
          return _codePointToString(0x1D552 + (runes - 97));
        } else if (runes >= 48 && runes <= 57) {
          // '0' to '9'
          return _codePointToString(0x1D7D8 + (runes - 48));
        }
        return String.fromCharCode(runes);
      })
      .join("");
}