golang/go

x/text: iterator does not handle zero width joiner

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#60,522 opened on May 30, 2023

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Description

What version of Go are you using (go version)?

Does this issue reproduce with the latest release?

Yes

What operating system and processor architecture are you using (go env)?

I'm using the go playground

What did you do?

package main

import (
	"fmt"

	"golang.org/x/text/unicode/norm"
)

func main() {
	var ia norm.Iter
	s := "👩🏾‍🦰👱🏾🧑🏾‍⚖️"

	ia.InitString(norm.NFD, s)
	rev := ""

	for !ia.Done() {
		n := ia.Next()
		rev = string(n) + rev
	}

	fmt.Println(rev)
}

Playground: https://go.dev/play/p/Jq9CnUd2zA8

What did you expect to see?

It should print 🧑🏾‍⚖️👱🏾👩🏾‍🦰

I think it has to do with the library not handling zero width joiners. If I use this string: "😀😂" it works as expected.

What did you see instead?

️⚖‍🏾🧑🏾👱🦰‍🏾👩

Contributor guide

Research direction
Investigate how norm.Iter handles zero width joiners. Look at the iteration logic for grapheme clusters in x/text/unicode/norm.
Tech stack
go
Domain
internationalization
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Go
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70