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Member "Atom/resources/app/apm/node_modules/wcwidth/index.js" (7 Feb 2017, 3141 Bytes) of archive /windows/misc/atom-windows.zip:


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    1 "use strict"
    2 
    3 var defaults = require('defaults')
    4 var combining = require('./combining')
    5 
    6 var DEFAULTS = {
    7   nul: 0,
    8   control: 0
    9 }
   10 
   11 module.exports = function wcwidth(str) {
   12   return wcswidth(str, DEFAULTS)
   13 }
   14 
   15 module.exports.config = function(opts) {
   16   opts = defaults(opts || {}, DEFAULTS)
   17   return function wcwidth(str) {
   18     return wcswidth(str, opts)
   19   }
   20 }
   21 
   22 /*
   23  *  The following functions define the column width of an ISO 10646
   24  *  character as follows:
   25  *  - The null character (U+0000) has a column width of 0.
   26  *  - Other C0/C1 control characters and DEL will lead to a return value
   27  *    of -1.
   28  *  - Non-spacing and enclosing combining characters (general category
   29  *    code Mn or Me in the
   30  *    Unicode database) have a column width of 0.
   31  *  - SOFT HYPHEN (U+00AD) has a column width of 1.
   32  *  - Other format characters (general category code Cf in the Unicode
   33  *    database) and ZERO WIDTH
   34  *    SPACE (U+200B) have a column width of 0.
   35  *  - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF)
   36  *    have a column width of 0.
   37  *  - Spacing characters in the East Asian Wide (W) or East Asian
   38  *    Full-width (F) category as
   39  *    defined in Unicode Technical Report #11 have a column width of 2.
   40  *  - All remaining characters (including all printable ISO 8859-1 and
   41  *    WGL4 characters, Unicode control characters, etc.) have a column
   42  *    width of 1.
   43  *  This implementation assumes that characters are encoded in ISO 10646.
   44 */
   45 
   46 function wcswidth(str, opts) {
   47   if (typeof str !== 'string') return wcwidth(str, opts)
   48 
   49   var s = 0
   50   for (var i = 0; i < str.length; i++) {
   51     var n = wcwidth(str.charCodeAt(i), opts)
   52     if (n < 0) return -1
   53     s += n
   54   }
   55 
   56   return s
   57 }
   58 
   59 function wcwidth(ucs, opts) {
   60   // test for 8-bit control characters
   61   if (ucs === 0) return opts.nul
   62   if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0)) return opts.control
   63 
   64   // binary search in table of non-spacing characters
   65   if (bisearch(ucs)) return 0
   66 
   67   // if we arrive here, ucs is not a combining or C0/C1 control character
   68   return 1 +
   69       (ucs >= 0x1100 &&
   70        (ucs <= 0x115f ||                       // Hangul Jamo init. consonants
   71         ucs == 0x2329 || ucs == 0x232a ||
   72         (ucs >= 0x2e80 && ucs <= 0xa4cf &&
   73          ucs != 0x303f) ||                     // CJK ... Yi
   74         (ucs >= 0xac00 && ucs <= 0xd7a3) ||    // Hangul Syllables
   75         (ucs >= 0xf900 && ucs <= 0xfaff) ||    // CJK Compatibility Ideographs
   76         (ucs >= 0xfe10 && ucs <= 0xfe19) ||    // Vertical forms
   77         (ucs >= 0xfe30 && ucs <= 0xfe6f) ||    // CJK Compatibility Forms
   78         (ucs >= 0xff00 && ucs <= 0xff60) ||    // Fullwidth Forms
   79         (ucs >= 0xffe0 && ucs <= 0xffe6) ||
   80         (ucs >= 0x20000 && ucs <= 0x2fffd) ||
   81         (ucs >= 0x30000 && ucs <= 0x3fffd)));
   82 }
   83 
   84 function bisearch(ucs) {
   85   var min = 0
   86   var max = combining.length - 1
   87   var mid
   88 
   89   if (ucs < combining[0][0] || ucs > combining[max][1]) return false
   90 
   91   while (max >= min) {
   92     mid = Math.floor((min + max) / 2)
   93     if (ucs > combining[mid][1]) min = mid + 1
   94     else if (ucs < combining[mid][0]) max = mid - 1
   95     else return true
   96   }
   97 
   98   return false
   99 }