1 files changed, 55 insertions, 0 deletions
diff --git a/src/lib/utils/glyph_hash.ts b/src/lib/utils/glyph_hash.ts
new file mode 100644
index 0000000..b704569
--- /dev/null
+++ b/src/lib/utils/glyph_hash.ts
@@ -0,0 +1,55 @@
+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);
+};