You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
46 lines
1.4 KiB
46 lines
1.4 KiB
'use strict';
|
|
/* eslint-disable yoda */
|
|
module.exports = x => {
|
|
if (Number.isNaN(x)) {
|
|
return false;
|
|
}
|
|
|
|
// code points are derived from:
|
|
// http://www.unix.org/Public/UNIDATA/EastAsianWidth.txt
|
|
if (
|
|
x >= 0x1100 && (
|
|
x <= 0x115f || // Hangul Jamo
|
|
x === 0x2329 || // LEFT-POINTING ANGLE BRACKET
|
|
x === 0x232a || // RIGHT-POINTING ANGLE BRACKET
|
|
// CJK Radicals Supplement .. Enclosed CJK Letters and Months
|
|
(0x2e80 <= x && x <= 0x3247 && x !== 0x303f) ||
|
|
// Enclosed CJK Letters and Months .. CJK Unified Ideographs Extension A
|
|
(0x3250 <= x && x <= 0x4dbf) ||
|
|
// CJK Unified Ideographs .. Yi Radicals
|
|
(0x4e00 <= x && x <= 0xa4c6) ||
|
|
// Hangul Jamo Extended-A
|
|
(0xa960 <= x && x <= 0xa97c) ||
|
|
// Hangul Syllables
|
|
(0xac00 <= x && x <= 0xd7a3) ||
|
|
// CJK Compatibility Ideographs
|
|
(0xf900 <= x && x <= 0xfaff) ||
|
|
// Vertical Forms
|
|
(0xfe10 <= x && x <= 0xfe19) ||
|
|
// CJK Compatibility Forms .. Small Form Variants
|
|
(0xfe30 <= x && x <= 0xfe6b) ||
|
|
// Halfwidth and Fullwidth Forms
|
|
(0xff01 <= x && x <= 0xff60) ||
|
|
(0xffe0 <= x && x <= 0xffe6) ||
|
|
// Kana Supplement
|
|
(0x1b000 <= x && x <= 0x1b001) ||
|
|
// Enclosed Ideographic Supplement
|
|
(0x1f200 <= x && x <= 0x1f251) ||
|
|
// CJK Unified Ideographs Extension B .. Tertiary Ideographic Plane
|
|
(0x20000 <= x && x <= 0x3fffd)
|
|
)
|
|
) {
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
};
|
|
|