www.aleph1.co.uk Git - yaffs-website/blob - node_modules/is-fullwidth-code-point/index.js

   1 'use strict';
   2 var numberIsNan = require('number-is-nan');
   3
   4 module.exports = function (x) {
   5         if (numberIsNan(x)) {
   6                 return false;
   7         }
   8
   9         // https://github.com/nodejs/io.js/blob/cff7300a578be1b10001f2d967aaedc88aee6402/lib/readline.js#L1369
  10
  11         // code points are derived from:
  12         // http://www.unix.org/Public/UNIDATA/EastAsianWidth.txt
  13         if (x >= 0x1100 && (
  14                 x <= 0x115f ||  // Hangul Jamo
  15                 0x2329 === x || // LEFT-POINTING ANGLE BRACKET
  16                 0x232a === x || // RIGHT-POINTING ANGLE BRACKET
  17                 // CJK Radicals Supplement .. Enclosed CJK Letters and Months
  18                 (0x2e80 <= x && x <= 0x3247 && x !== 0x303f) ||
  19                 // Enclosed CJK Letters and Months .. CJK Unified Ideographs Extension A
  20                 0x3250 <= x && x <= 0x4dbf ||
  21                 // CJK Unified Ideographs .. Yi Radicals
  22                 0x4e00 <= x && x <= 0xa4c6 ||
  23                 // Hangul Jamo Extended-A
  24                 0xa960 <= x && x <= 0xa97c ||
  25                 // Hangul Syllables
  26                 0xac00 <= x && x <= 0xd7a3 ||
  27                 // CJK Compatibility Ideographs
  28                 0xf900 <= x && x <= 0xfaff ||
  29                 // Vertical Forms
  30                 0xfe10 <= x && x <= 0xfe19 ||
  31                 // CJK Compatibility Forms .. Small Form Variants
  32                 0xfe30 <= x && x <= 0xfe6b ||
  33                 // Halfwidth and Fullwidth Forms
  34                 0xff01 <= x && x <= 0xff60 ||
  35                 0xffe0 <= x && x <= 0xffe6 ||
  36                 // Kana Supplement
  37                 0x1b000 <= x && x <= 0x1b001 ||
  38                 // Enclosed Ideographic Supplement
  39                 0x1f200 <= x && x <= 0x1f251 ||
  40                 // CJK Unified Ideographs Extension B .. Tertiary Ideographic Plane
  41                 0x20000 <= x && x <= 0x3fffd)) {
  42                 return true;
  43         }
  44
  45         return false;
  46 }