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export type GlyphHash = GlyphHashFragment[];
type GlyphHashFragment = {
glyph: string;
color: string;
};
const internals = {
kDehyphenRegex: /[-]/g,
kSplitterRegex: /.{1,8}/g,
kGlyphs: ['☽', '☆', '♢', '♡', '╱', '╲', '╳', '〰', '▷', '⏊', '〒', '▢', '◯', '⏃', '⏀', '⏆'],
unexpectedUUIDLength: class UnexpectedUUIDLength extends Error {
name = 'UnexpectedUUIDLength';
message =
'The provided string was not a valid UUIDv4, please provide a 32 character long string';
}
};
// Return a glyph with color based on a 4 byte fragment of a UUIDv4
const getGlyphHashFragment = function (uuidFragment: string): GlyphHashFragment {
const glyphIndex = parseInt(uuidFragment.substring(0, 2), 16) % 16;
return {
glyph: internals.kGlyphs[glyphIndex],
color: `#${uuidFragment.substring(2, 8)}`
};
};
// Return an array of glyphs based on a UUIDv4
export const getGlyphHash = function (uuid: string): GlyphHash {
const dehyphenedUuid = uuid.replace(/[-]/g, '');
if (dehyphenedUuid.length !== 32) {
throw new internals.unexpectedUUIDLength();
}
const hashFragments = dehyphenedUuid.match(internals.kSplitterRegex);
return hashFragments.map(getGlyphHashFragment);
};
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