index.js
1.43 KB
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'use strict';
var numberIsNan = require('number-is-nan');
module.exports = function (x) {
if (numberIsNan(x)) {
return false;
}
// https://github.com/nodejs/io.js/blob/cff7300a578be1b10001f2d967aaedc88aee6402/lib/readline.js#L1369
// code points are derived from:
// http://www.unix.org/Public/UNIDATA/EastAsianWidth.txt
if (x >= 0x1100 && (
x <= 0x115f || // Hangul Jamo
0x2329 === x || // LEFT-POINTING ANGLE BRACKET
0x232a === x || // 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;
}