Sorting non ascii characters in Dart

Question

Users submitted those weird characters. How to sort them along with normal text in Dart ?

𝔦𝔠𝔦𝔞𝔩𝔞
𝓕𝓪𝓴𝓷𝓬𝓻𝓪
𝗺𝗹𝗲𝗖𝗹𝗮𝗿𝗮
𝙖𝙨𝙡𝙖𝙜𝙖𝙈𝙮
𝖧𝗋𝗂𝖾
𝑮𝒂𝒍𝒍𝒆𝒂
𝐿𝑢𝑛𝑎
𝐃𝐡𝐢𝐚
𝕠ℝ𝕒𝕥𝕧𝕒𝕠𝕜𝕠

The good old b.name.toLowerCase().compareTo(a.name.toLowerCase()); does not work

in other words how to translate them to iciala Fakncra mleClara Hrie ... — TSR
– TSR, Commented Jun 21, 2023 at 2:00
.toLowerCase says "This function uses the language independent Unicode mapping and thus only works in some languages." I don't think there's any better way of doing it, unless you have magical knowledge about the Unicode characters involved. — Randal Schwartz
– Randal Schwartz, Commented Jun 21, 2023 at 2:10

JaffaKetchup · Accepted Answer · 2023-08-03 20:43:43Z

UPDATE: Just found https://pub.dev/packages/diacritic, which appears as though it might do roughly what you want, although I'm not sure of how many different characters it supports.

Well, a good place to start might be looking at the internal implementation of the ES6 String.prototype.normalize() function.

Interestingly, it only works in Compatibility Decomposition mode - ie. NFKC or NFKD.

for (const weirdString of [
  '𝔦𝔠𝔦𝔞𝔩𝔞',
  '𝓕𝓪𝓴𝓷𝓬𝓻𝓪',
  '𝗺𝗹𝗲𝗖𝗹𝗮𝗿𝗮',
  '𝙖𝙨𝙡𝙖𝙜𝙖𝙈𝙮',
  '𝖧𝗋𝗂𝖾',
  '𝑮𝒂𝒍𝒍𝒆𝒂',
  '𝐿𝑢𝑛𝑎',
  '𝐃𝐡𝐢𝐚',
  '𝕠ℝ𝕒𝕥𝕧𝕒𝕠𝕜𝕠',
]) {console.log(weirdString.normalize('NFKC'))}

Anyway, maybe there is a translation in Dart, or you can use the 'dart:js' library if you're running on the web, or you could find the implementation in the V8 engine (although it'll probably be in C).

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