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'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;
};
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