# About the selection range when double-clicking. (Intl.Segmenter)
**URL:** https://discuss.codemirror.net/t/about-the-selection-range-when-double-clicking-intl-segmenter/4241
**Category:** v6
**Created:** [April 7, 2022, 2:48pm UTC](https://discuss.codemirror.net/t/about-the-selection-range-when-double-clicking-intl-segmenter/4241 "2022-04-07T14:48:12Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@arayutw](https://discuss.codemirror.net/u/arayutw)
#### Post date: [April 7, 2022, 2:48pm UTC](https://discuss.codemirror.net/t/about-the-selection-range-when-double-clicking-intl-segmenter/4241/1 "2022-04-07T14:48:12Z")
About the selection range when double-clicking.
Not surprisingly, within CJK, the current specifications will give unnatural results.
Therefore, can use the function of `Intl.Segmenter` to properly extract the selection range.
Currently, I have changed the code as follows and am satisfied with it.
```auto
function groupAt(state, pos, bias = 1) {
let line = state.doc.lineAt(pos), linePos = pos - line.from;
if (line.length == 0)
return EditorSelection.cursor(pos);
var from, to;
if ("Intl" in self && "function" === typeof Intl["Segmenter"]) {
// "山は綺麗だ。" => "山|は|綺麗|だ|。"
var segmenter = new Intl["Segmenter"]("ja", { "granularity": "word" });
var segments = segmenter.segment(line["text"]);
var matches = segments.containing(linePos);
from = matches["index"];
to = from + matches["segment"]["length"];
} else {
let categorize = state.charCategorizer(pos);
if (linePos == 0)
bias = 1;
else if (linePos == line.length)
bias = -1;
from = to = linePos;
if (bias < 0)
from = findClusterBreak(line.text, linePos, false);
else
to = findClusterBreak(line.text, linePos);
let cat = categorize(line.text.slice(from, to));
while (from > 0) {
let prev = findClusterBreak(line.text, from, false);
if (categorize(line.text.slice(prev, from)) != cat)
break;
from = prev;
}
while (to < line.length) {
let next = findClusterBreak(line.text, to);
if (categorize(line.text.slice(to, next)) != cat)
break;
to = next;
}
}
return EditorSelection.range(from + line.from, to + line.from);
}
```
Because it is a part that can not be changed using plug-ins etc.
- Whether to use Intl.Segmenter?
- Which language code should you use? (`ja` etc)
I think it would be convenient if there is a way to specify this as an option when creating an instance, so I will propose it.
According to can i use, Intl.Segmenter seems to be supported by major browsers.
> **["Intl.Segmenter" | Can I use... Support tables for HTML5, CSS3, etc](https://caniuse.com/?search=Intl.Segmenter)**
>
> "Can I use" provides up-to-date browser support tables for support of front-end web technologies on desktop and mobile web browsers.
MDN has a playground.
> **[Intl.Segmenter() constructor - JavaScript | MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/Segmenter/Segmenter)**
>
> The Intl.Segmenter() constructor creates Intl.Segmenter objects that enable locale-sensitive text segmentation.
---
### Author:  [@marijn](https://discuss.codemirror.net/u/marijn)
#### Post date: [April 22, 2022, 1:55pm UTC](https://discuss.codemirror.net/t/about-the-selection-range-when-double-clicking-intl-segmenter/4241/2 "2022-04-22T13:55:08Z")
I see your point, but character categories are integrated with features like language-specific word characters (your patch would break, for example, selecting `$name`-style variables in languages that have them) and by-group cursor motion. Also, as long as segmenting is non-standard and not available on Firefox, I don’t really want to redesign these features around it.
---
### Author:  [@arayutw](https://discuss.codemirror.net/u/arayutw)
#### Post date: [April 22, 2022, 2:09pm UTC](https://discuss.codemirror.net/t/about-the-selection-range-when-double-clicking-intl-segmenter/4241/3 "2022-04-22T14:09:22Z")
Hello. Thank you for your reply.
Your claim is reasonable, so I’ll try to change it locally.
---
### Author:  [@marijn](https://discuss.codemirror.net/u/marijn)
#### Post date: [April 22, 2022, 3:54pm UTC](https://discuss.codemirror.net/t/about-the-selection-range-when-double-clicking-intl-segmenter/4241/4 "2022-04-22T15:54:52Z")
An event handler that implements custom behavior for double clicks shouldn’t be too difficult to put together.