git.r.bdr.sh - rbdr/forum/blob - src/lib/utils/glyph_hash.ts

   1 export type GlyphHash = GlyphHashFragment[];
   2 type GlyphHashFragment = {
   3         glyph: string;
   4         color: string;
   5 };
   6
   7 const internals = {
   8         kDehyphenRegex: /[-]/g,
   9         kSplitterRegex: /.{1,8}/g,
  10         kGlyphs: ['☽', '☆', '♢', '♡', '╱', '╲', '╳', '〰', '▷', '⏊', '〒', '▢', '◯', '⏃', '⏀', '⏆'],
  11         unexpectedUUIDLength: class UnexpectedUUIDLength extends Error {
  12                 name = 'UnexpectedUUIDLength';
  13                 message =
  14                         'The provided string was not a valid UUIDv4, please provide a 32 character long string';
  15         }
  16 };
  17
  18 // Return a glyph with color based on a 4 byte fragment of a UUIDv4
  19 const getGlyphHashFragment = function (uuidFragment: string): GlyphHashFragment {
  20         const glyphIndex = parseInt(uuidFragment.substring(0, 2), 16) % 16;
  21         return {
  22                 glyph: internals.kGlyphs[glyphIndex],
  23                 color: `#${uuidFragment.substring(2, 8)}`
  24         };
  25 };
  26
  27 // Return an array of glyphs based on a UUIDv4
  28 export const getGlyphHash = function (uuid: string): GlyphHash {
  29         const dehyphenedUuid = uuid.replace(/[-]/g, '');
  30
  31         if (dehyphenedUuid.length !== 32) {
  32                 throw new internals.unexpectedUUIDLength();
  33         }
  34
  35         const hashFragments = dehyphenedUuid.match(internals.kSplitterRegex);
  36         return hashFragments.map(getGlyphHashFragment);
  37 };