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

   1 const internals = {
   2   kDehyphenRegex: /[-]/g,
   3   kSplitterRegex: /.{1,8}/g,
   4   kGlyphs: [
   5     '☽',
   6     '☆',
   7     '♢',
   8     '♡',
   9     '╱',
  10     '╲',
  11     '╳',
  12     '〰',
  13     '▷',
  14     '⏊',
  15     '〒',
  16     '▢',
  17     '◯',
  18     '⏃',
  19     '⏀',
  20     '⏆'
  21   ],
  22   unexpectedUUIDLength: class UnexpectedUUIDLength extends Error {
  23     name = 'UnexpectedUUIDLength';
  24     message = 'The provided string was not a valid UUIDv4, please provide a 32 character long string'
  25   }
  26 };
  27
  28 // Return a glyph with color based on a 4 byte fragment of a UUIDv4
  29 const getGlyphHashFragment = function (uuidFragment) {
  30
  31   const glyphIndex = parseInt(uuidFragment.substring(0, 2), 16) % 16;
  32   return {
  33     glyph: internals.kGlyphs[glyphIndex],
  34     color: `#${uuidFragment.substring(2, 8)}`
  35   };
  36 };
  37
  38 // Return an array of glyphs based on a UUIDv4
  39 export const getGlyphHash = function (uuid) {
  40
  41   const dehyphenedUuid = uuid.replace(/[-]/g, '');
  42
  43   if (dehyphenedUuid.length !== 32) {
  44     throw new internals.unexpectedUUIDLength();
  45   }
  46
  47   const hashFragments = dehyphenedUuid.match(internals.kSplitterRegex);
  48   return hashFragments.map(getGlyphHashFragment);
  49 };