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46 lines
1.4 KiB
46 lines
1.4 KiB
'use strict'; |
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var numberIsNan = require('number-is-nan'); |
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module.exports = function (x) { |
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if (numberIsNan(x)) { |
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return false; |
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} |
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// https://github.com/nodejs/io.js/blob/cff7300a578be1b10001f2d967aaedc88aee6402/lib/readline.js#L1369 |
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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 (x >= 0x1100 && ( |
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x <= 0x115f || // Hangul Jamo |
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0x2329 === x || // LEFT-POINTING ANGLE BRACKET |
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0x232a === x || // 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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return true; |
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} |
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return false; |
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}
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