Prevent chars with code point > 0xffff

Author: dingosky

src/lib/chars.spec.ts

@@ -38,6 +38,7 @@ test('invalid characters', (t) => {
   t.regex(invalidChars('dingo\\sky'), /Invalid/)
   t.regex(invalidChars('dingo`sky'), /Invalid/)
   t.regex(invalidChars('dingo\u0088sky'), /Invalid/)
+  t.regex(invalidChars('dîngøsky:🐕'), /Invalid/)
 })
 
 test('non-unique character', (t) => t.regex(invalidChars('unique'), /not unique/))

src/lib/chars.ts

@@ -48,8 +48,9 @@ export const charsName = (chars: string): string => {
 }
 
 const validChar = (char: string): boolean => {
-  const codePointNonBreakSpace = 160
+  if (char.codePointAt(1)) return false
 
+  const codePointNonBreakSpace = 160
   const codePoint = codePointOf(char)
 
   if (codePoint < codePointOf('!')) return false
@@ -60,6 +61,8 @@ const validChar = (char: string): boolean => {
   if (codePoint <= codePointOf('~')) return true
   if (codePoint < codePointNonBreakSpace) return false
 
+  if (char.codePointAt(1)) return false
+
   return true
 }
 

src/lib/puid.spec.ts

@@ -183,6 +183,17 @@ test('dîngøsky chars (count power of 2 with carry)', (t) => {
   t.is(dingoskyUtf8Id(), 'ksk')
 })
 
+test('dîngøsky:￦ chars', (t) => {
+  const dingoskyDogBytes = fixedBytes([
+    0xec, 0xf9, 0xdb, 0x7a, 0x33, 0x3d, 0x21, 0x97, 0xa0, 0xc2, 0xbf, 0x92, 0x80, 0xdd, 0x2f, 0x57, 0x12, 0xc1, 0x1a,
+    0xef
+  ])
+  const dingoskyDogId = puidGenerator({ bits: 24, chars: 'dîngøsky:￦', entropyBytes: dingoskyDogBytes })
+
+  t.is(dingoskyDogId(), '￦gî￦￦nî￦')
+  t.is(dingoskyDogId(), 'ydkîsnsd')
+  t.is(dingoskyDogId(), 'îøsîndøk')
+})
 
 test('Safe32 (count non-power of 2 with carry)', (t) => {
   //    D    2    E    3    E    9    D    A    1    9    0    3    B    7    3    C