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+/* eslint-disable yoda */
+'use strict';
+
+const isFullwidthCodePoint = codePoint => {
+ if (Number.isNaN(codePoint)) {
+ return false;
+ }
+
+ // Code points are derived from:
+ // http://www.unix.org/Public/UNIDATA/EastAsianWidth.txt
+ if (
+ codePoint >= 0x1100 && (
+ codePoint <= 0x115F || // Hangul Jamo
+ codePoint === 0x2329 || // LEFT-POINTING ANGLE BRACKET
+ codePoint === 0x232A || // RIGHT-POINTING ANGLE BRACKET
+ // CJK Radicals Supplement .. Enclosed CJK Letters and Months
+ (0x2E80 <= codePoint && codePoint <= 0x3247 && codePoint !== 0x303F) ||
+ // Enclosed CJK Letters and Months .. CJK Unified Ideographs Extension A
+ (0x3250 <= codePoint && codePoint <= 0x4DBF) ||
+ // CJK Unified Ideographs .. Yi Radicals
+ (0x4E00 <= codePoint && codePoint <= 0xA4C6) ||
+ // Hangul Jamo Extended-A
+ (0xA960 <= codePoint && codePoint <= 0xA97C) ||
+ // Hangul Syllables
+ (0xAC00 <= codePoint && codePoint <= 0xD7A3) ||
+ // CJK Compatibility Ideographs
+ (0xF900 <= codePoint && codePoint <= 0xFAFF) ||
+ // Vertical Forms
+ (0xFE10 <= codePoint && codePoint <= 0xFE19) ||
+ // CJK Compatibility Forms .. Small Form Variants
+ (0xFE30 <= codePoint && codePoint <= 0xFE6B) ||
+ // Halfwidth and Fullwidth Forms
+ (0xFF01 <= codePoint && codePoint <= 0xFF60) ||
+ (0xFFE0 <= codePoint && codePoint <= 0xFFE6) ||
+ // Kana Supplement
+ (0x1B000 <= codePoint && codePoint <= 0x1B001) ||
+ // Enclosed Ideographic Supplement
+ (0x1F200 <= codePoint && codePoint <= 0x1F251) ||
+ // CJK Unified Ideographs Extension B .. Tertiary Ideographic Plane
+ (0x20000 <= codePoint && codePoint <= 0x3FFFD)
+ )
+ ) {
+ return true;
+ }
+
+ return false;
+};
+
+module.exports = isFullwidthCodePoint;
+module.exports.default = isFullwidthCodePoint;