1/* eslint-disable yoda */
2'use strict';
3
4const isFullwidthCodePoint = codePoint => {
5	if (Number.isNaN(codePoint)) {
6		return false;
7	}
8
9	// Code points are derived from:
10	// http://www.unix.org/Public/UNIDATA/EastAsianWidth.txt
11	if (
12		codePoint >= 0x1100 && (
13			codePoint <= 0x115F || // Hangul Jamo
14			codePoint === 0x2329 || // LEFT-POINTING ANGLE BRACKET
15			codePoint === 0x232A || // RIGHT-POINTING ANGLE BRACKET
16			// CJK Radicals Supplement .. Enclosed CJK Letters and Months
17			(0x2E80 <= codePoint && codePoint <= 0x3247 && codePoint !== 0x303F) ||
18			// Enclosed CJK Letters and Months .. CJK Unified Ideographs Extension A
19			(0x3250 <= codePoint && codePoint <= 0x4DBF) ||
20			// CJK Unified Ideographs .. Yi Radicals
21			(0x4E00 <= codePoint && codePoint <= 0xA4C6) ||
22			// Hangul Jamo Extended-A
23			(0xA960 <= codePoint && codePoint <= 0xA97C) ||
24			// Hangul Syllables
25			(0xAC00 <= codePoint && codePoint <= 0xD7A3) ||
26			// CJK Compatibility Ideographs
27			(0xF900 <= codePoint && codePoint <= 0xFAFF) ||
28			// Vertical Forms
29			(0xFE10 <= codePoint && codePoint <= 0xFE19) ||
30			// CJK Compatibility Forms .. Small Form Variants
31			(0xFE30 <= codePoint && codePoint <= 0xFE6B) ||
32			// Halfwidth and Fullwidth Forms
33			(0xFF01 <= codePoint && codePoint <= 0xFF60) ||
34			(0xFFE0 <= codePoint && codePoint <= 0xFFE6) ||
35			// Kana Supplement
36			(0x1B000 <= codePoint && codePoint <= 0x1B001) ||
37			// Enclosed Ideographic Supplement
38			(0x1F200 <= codePoint && codePoint <= 0x1F251) ||
39			// CJK Unified Ideographs Extension B .. Tertiary Ideographic Plane
40			(0x20000 <= codePoint && codePoint <= 0x3FFFD)
41		)
42	) {
43		return true;
44	}
45
46	return false;
47};
48
49module.exports = isFullwidthCodePoint;
50module.exports.default = isFullwidthCodePoint;
51