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     '☽',
  12     '☆',
  13     '♢',
  14     '♡',
  15     '╱',
  16     '╲',
  17     '╳',
  18     '〰',
  19     '▷',
  20     '⏊',
  21     '〒',
  22     '▢',
  23     '◯',
  24     '⏃',
  25     '⏀',
  26     '⏆'
  27   ],
  28   unexpectedUUIDLength: class UnexpectedUUIDLength extends Error {
  29     name = 'UnexpectedUUIDLength';
  30     message = 'The provided string was not a valid UUIDv4, please provide a 32 character long string'
  31   }
  32 };
  33
  34 // Return a glyph with color based on a 4 byte fragment of a UUIDv4
  35 const getGlyphHashFragment = function (uuidFragment: string): GlyphHashFragment {
  36
  37   const glyphIndex = parseInt(uuidFragment.substring(0, 2), 16) % 16;
  38   return {
  39     glyph: internals.kGlyphs[glyphIndex],
  40     color: `#${uuidFragment.substring(2, 8)}`
  41   };
  42 };
  43
  44 // Return an array of glyphs based on a UUIDv4
  45 export const getGlyphHash = function (uuid: string): GlyphHash {
  46
  47   const dehyphenedUuid = uuid.replace(/[-]/g, '');
  48
  49   if (dehyphenedUuid.length !== 32) {
  50     throw new internals.unexpectedUUIDLength();
  51   }
  52
  53   const hashFragments = dehyphenedUuid.match(internals.kSplitterRegex);
  54   return hashFragments.map(getGlyphHashFragment);
  55 };