ce4c83ff
 wxy
初始提交
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"use strict"
var defaults = require('defaults')
var combining = require('./combining')
var DEFAULTS = {
nul: 0,
control: 0
}
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)
}
}
/*
* The following functions define the column width of an ISO 10646
* character as follows:
* - The null character (U+0000) has a column width of 0.
* - Other C0/C1 control characters and DEL will lead to a return value
* of -1.
* - Non-spacing and enclosing combining characters (general category
* code Mn or Me in the
* Unicode database) have a column width of 0.
* - SOFT HYPHEN (U+00AD) has a column width of 1.
* - Other format characters (general category code Cf in the Unicode
* database) and ZERO WIDTH
* SPACE (U+200B) have a column width of 0.
* - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF)
* have a column width of 0.
* - Spacing characters in the East Asian Wide (W) or East Asian
* Full-width (F) category as
* defined in Unicode Technical Report #11 have a column width of 2.
* - All remaining characters (including all printable ISO 8859-1 and
* WGL4 characters, Unicode control characters, etc.) have a column
* width of 1.
* This implementation assumes that characters are encoded in ISO 10646.
*/
function wcswidth(str, opts) {
if (typeof str !== 'string') return wcwidth(str, opts)
var s = 0
for (var i = 0; i < str.length; i++) {
var n = wcwidth(str.charCodeAt(i), opts)
if (n < 0) return -1
s += n
}
return s
}
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 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
}
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