55 lines
1 KiB
JavaScript
55 lines
1 KiB
JavaScript
import stripAnsi from 'strip-ansi';
|
|
import eastAsianWidth from 'eastasianwidth';
|
|
import emojiRegex from 'emoji-regex';
|
|
|
|
export default function stringWidth(string, options = {}) {
|
|
if (typeof string !== 'string' || string.length === 0) {
|
|
return 0;
|
|
}
|
|
|
|
options = {
|
|
ambiguousIsNarrow: true,
|
|
...options
|
|
};
|
|
|
|
string = stripAnsi(string);
|
|
|
|
if (string.length === 0) {
|
|
return 0;
|
|
}
|
|
|
|
string = string.replace(emojiRegex(), ' ');
|
|
|
|
const ambiguousCharacterWidth = options.ambiguousIsNarrow ? 1 : 2;
|
|
let width = 0;
|
|
|
|
for (const character of string) {
|
|
const codePoint = character.codePointAt(0);
|
|
|
|
// Ignore control characters
|
|
if (codePoint <= 0x1F || (codePoint >= 0x7F && codePoint <= 0x9F)) {
|
|
continue;
|
|
}
|
|
|
|
// Ignore combining characters
|
|
if (codePoint >= 0x300 && codePoint <= 0x36F) {
|
|
continue;
|
|
}
|
|
|
|
const code = eastAsianWidth.eastAsianWidth(character);
|
|
switch (code) {
|
|
case 'F':
|
|
case 'W':
|
|
width += 2;
|
|
break;
|
|
case 'A':
|
|
width += ambiguousCharacterWidth;
|
|
break;
|
|
default:
|
|
width += 1;
|
|
}
|
|
}
|
|
|
|
return width;
|
|
}
|