Diacritical marks

Author: dotcypress

.gitignore

@@ -31,3 +31,4 @@ node_modules
 
 # Optional REPL history
 .node_repl_history
+package-lock.json

index.js

@@ -14,6 +14,9 @@ const FITZPATRICK_MODIFIER_END = 0x1f3ff
 const VARIATION_MODIFIER_START = 0xfe00
 const VARIATION_MODIFIER_END = 0xfe0f
 
+const DIACRITICAL_MARKS_START = 0x20D0
+const DIACRITICAL_MARKS_END = 0x20FF
+
 const ZWJ = 0x200d
 
 const GRAPHEMS = [
@@ -49,6 +52,9 @@ function runes (string) {
     if (isVariationSelector(string[i + increment])) {
       increment++
     }
+    if (isDiacriticalMark(string[i + increment])) {
+      increment++
+    }
     if (isZeroWidthJoiner(string[i + increment])) {
       increment++
       continue
@@ -114,6 +120,10 @@ function isVariationSelector (string) {
   return typeof string === 'string' && betweenInclusive(string.charCodeAt(0), VARIATION_MODIFIER_START, VARIATION_MODIFIER_END)
 }
 
+function isDiacriticalMark (string) {
+  return typeof string === 'string' && betweenInclusive(string.charCodeAt(0), DIACRITICAL_MARKS_START, DIACRITICAL_MARKS_END)
+}
+
 function isGraphem (string) {
   return typeof string === 'string' && GRAPHEMS.indexOf(string.charCodeAt(0)) !== -1
 }

package.json

@@ -30,7 +30,7 @@
     "index.js"
   ],
   "devDependencies": {
-    "ava": "^0.19.1",
+    "ava": "^0.22.0",
     "eslint": "^4.1.1",
     "eslint-config-standard": "^10.2.1",
     "eslint-plugin-ava": "^4.0.0",

test/runes.js

@@ -94,6 +94,10 @@ test('✂️  Runes should handle country flags/regional indicator characters',
   t.deepEqual(runes('🇦🇸'), ['🇦🇸'])
 })
 
+test('✂️  Runes should handle 3️⃣', (t) => {
+  t.deepEqual(runes('3️⃣'), ['3️⃣'])
+})
+
 test('✂️  Runes should handle 🏳️‍🌈', (t) => {
   t.deepEqual(runes('🏳️‍🌈'), ['🏳️‍🌈'])
 })