/usr/lib/nodejs/wcwidth.js/index.js is in node-wcwidth.js 1.0.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 | /*
* wcwidth.js: a javascript porting of Markus Kuhn's wcwidth()
*/
"use strict"
var defaults = require('defaults')
var combining = require('./combining')
var DEFAULTS = {
nul: 0,
control: 0
}
function bisearch(ucs) {
var min = 0
var max = combining.length - 1
var mid
if (ucs < combining[0][0] || ucs > combining[max][1]) return false
while (max >= min) {
mid = Math.floor((min + max) / 2)
if (ucs > combining[mid][1]) min = mid + 1
else if (ucs < combining[mid][0]) max = mid - 1
else return true
}
return false
}
function wcwidth(ucs, opts) {
// test for 8-bit control characters
if (ucs === 0) return opts.nul
if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0)) return opts.control
// binary search in table of non-spacing characters
if (bisearch(ucs)) return 0
// if we arrive here, ucs is not a combining or C0/C1 control character
return 1 +
(ucs >= 0x1100 &&
(ucs <= 0x115f || // Hangul Jamo init. consonants
ucs == 0x2329 || ucs == 0x232a ||
(ucs >= 0x2e80 && ucs <= 0xa4cf &&
ucs != 0x303f) || // CJK ... Yi
(ucs >= 0xac00 && ucs <= 0xd7a3) || // Hangul Syllables
(ucs >= 0xf900 && ucs <= 0xfaff) || // CJK Compatibility Ideographs
(ucs >= 0xfe10 && ucs <= 0xfe19) || // Vertical forms
(ucs >= 0xfe30 && ucs <= 0xfe6f) || // CJK Compatibility Forms
(ucs >= 0xff00 && ucs <= 0xff60) || // Fullwidth Forms
(ucs >= 0xffe0 && ucs <= 0xffe6) ||
(ucs >= 0x20000 && ucs <= 0x2fffd) ||
(ucs >= 0x30000 && ucs <= 0x3fffd)));
}
function wcswidth(str, opts) {
var h, l
var s = 0, n
if (typeof str !== 'string') return wcwidth(str, opts)
for (var i = 0; i < str.length; i++) {
h = str.charCodeAt(i)
if (h >= 0xd800 && h <= 0xdbff) {
l = str.charCodeAt(++i)
if (l >= 0xdc00 && l <= 0xdfff) h = (h-0xd800)*0x400 + (l-0xdc00)+0x10000
else i--
}
n = wcwidth(h, opts)
if (n < 0) return -1
s += n
}
return s
}
module.exports = function wcwidth(str) {
return wcswidth(str, DEFAULTS)
}
module.exports.config = function(opts) {
opts = defaults(opts || {}, DEFAULTS)
return function wcwidth(str) {
return wcswidth(str, opts)
}
}
// end of wcwidth.js
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