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47 lines
1.4 KiB
JavaScript
47 lines
1.4 KiB
JavaScript
'use strict';
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/* eslint-disable yoda */
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module.exports = x => {
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if (Number.isNaN(x)) {
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return false;
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}
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// code points are derived from:
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// http://www.unix.org/Public/UNIDATA/EastAsianWidth.txt
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if (
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x >= 0x1100 && (
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x <= 0x115f || // Hangul Jamo
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x === 0x2329 || // LEFT-POINTING ANGLE BRACKET
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x === 0x232a || // RIGHT-POINTING ANGLE BRACKET
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// CJK Radicals Supplement .. Enclosed CJK Letters and Months
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(0x2e80 <= x && x <= 0x3247 && x !== 0x303f) ||
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// Enclosed CJK Letters and Months .. CJK Unified Ideographs Extension A
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(0x3250 <= x && x <= 0x4dbf) ||
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// CJK Unified Ideographs .. Yi Radicals
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(0x4e00 <= x && x <= 0xa4c6) ||
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// Hangul Jamo Extended-A
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(0xa960 <= x && x <= 0xa97c) ||
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// Hangul Syllables
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(0xac00 <= x && x <= 0xd7a3) ||
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// CJK Compatibility Ideographs
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(0xf900 <= x && x <= 0xfaff) ||
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// Vertical Forms
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(0xfe10 <= x && x <= 0xfe19) ||
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// CJK Compatibility Forms .. Small Form Variants
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(0xfe30 <= x && x <= 0xfe6b) ||
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// Halfwidth and Fullwidth Forms
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(0xff01 <= x && x <= 0xff60) ||
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(0xffe0 <= x && x <= 0xffe6) ||
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// Kana Supplement
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(0x1b000 <= x && x <= 0x1b001) ||
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// Enclosed Ideographic Supplement
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(0x1f200 <= x && x <= 0x1f251) ||
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// CJK Unified Ideographs Extension B .. Tertiary Ideographic Plane
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(0x20000 <= x && x <= 0x3fffd)
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)
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) {
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return true;
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}
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return false;
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};
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