Parser for emojis?

[nank1ro]

Hi, thank you so much for this amazing package.
I've built notescalculator.com using it and it helped a lot.

May I know If there is a way to accept emojis in a parser?

I have this parser now

  late final Parser<String> variable = [
    char(' ').star(),
    letter(),
    pattern('a-zA-Z_0-9 ').star().optional()
  ].toSequenceParser().flatten().map((value) => value.trim());

But I would like it to accept something like 👍 hello or hel👍lo

[renggli]

Thank you for the feedback, and for sharing your amazing application. Works very nicely on the web!

Unfortunately detecting emoji characters in Unicode is not trivial. The easiest way to go about it is probably to use the package emoji_regex. Its complicated regular expression can be used with the PatternParser which seems to work well in my test below:

import 'package:emoji_regex/emoji_regex.dart';
import 'package:petitparser/petitparser.dart';

final emoji =
    PatternParser(emojiRegex(), 'Emoji expected').map((each) => each[0]);

void main() {
  const input = '😊, 🐪, 🇯🇵, 🙋🏿, 👨‍👩‍👧‍👦';
  print(emoji.allMatches(input).join('\n'));
}

Possibly it would be more efficient to implement the regular expression using PetitParser patterns, but to get started this is the easiest solution I can think of.

[nank1ro]

Thank you so much for the help! It worked perfectly fine 🎉