fix: spec update - blocklist filtering in uppercase-only alphabet

Author: 4kimov

CHANGELOG.md

@@ -1,5 +1,9 @@
 # CHANGELOG
 
+**v0.1.3:**
+- Bug fix: spec update: blocklist filtering in uppercase-only alphabet [[PR #7](https://github.com/sqids/sqids-spec/pull/7)]
+- Dev dependencies updated
+
 **v0.1.2:**
 - Bug fix: cjs import error [[PR #5](https://github.com/sqids/sqids-javascript/pull/5)]
 

cjs/sqids.js

@@ -1,6 +1,6 @@
 {
   "name": "sqids",
-  "version": "0.1.2",
+  "version": "0.1.3",
   "description": "Generate YouTube-like ids from numbers.",
   "keywords": [
     "sqids",
@@ -80,7 +80,7 @@
     "not dead"
   ],
   "devDependencies": {
-    "@niieani/scaffold": "^1.7.3",
+    "@niieani/scaffold": "^1.7.8",
     "nodemark": "^0.3.0",
     "require-from-web": "^1.2.0",
     "ts-node": "^10.9.1"

dist/sqids.js

@@ -604,13 +604,14 @@ export default class Sqids {
     }
 
     const filteredBlocklist = new Set<string>()
-    const alphabetChars = alphabet.split('')
+    const alphabetChars = alphabet.toLowerCase().split('')
     for (const word of blocklist) {
       if (word.length >= 3) {
-        const wordChars = word.split('')
+        const wordLowercased = word.toLowerCase()
+        const wordChars = wordLowercased.split('')
         const intersection = wordChars.filter((c) => alphabetChars.includes(c))
         if (intersection.length === wordChars.length) {
-          filteredBlocklist.add(word.toLowerCase())
+          filteredBlocklist.add(wordLowercased)
         }
       }
     }

esm/sqids.js

@@ -74,4 +74,17 @@ describe('blocklist', () => {
 
     expect(sqids.decode(sqids.encode([1_000]))).toEqual([1_000])
   })
+
+  it('blocklist filtering in constructor', () => {
+    const sqids = new Sqids({
+      alphabet: 'ABCDEFGHIJKLMNOPQRSTUVWXYZ',
+      blocklist: new Set(['sqnmpn']), // lowercase blocklist in only-uppercase alphabet
+    })
+
+    const id = sqids.encode([1, 2, 3])
+    const numbers = sqids.decode(id)
+
+    expect(id).toBe('ULPBZGBM') // without blocklist, would've been "SQNMPN"
+    expect(numbers).toEqual([1, 2, 3])
+  })
 })