100 lines
3.1 KiB
JavaScript
100 lines
3.1 KiB
JavaScript
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"use strict"
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var defaults = require('defaults')
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var combining = require('./combining')
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var DEFAULTS = {
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nul: 0,
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control: 0
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}
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module.exports = function wcwidth(str) {
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return wcswidth(str, DEFAULTS)
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}
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module.exports.config = function(opts) {
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opts = defaults(opts || {}, DEFAULTS)
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return function wcwidth(str) {
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return wcswidth(str, opts)
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}
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}
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/*
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* The following functions define the column width of an ISO 10646
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* character as follows:
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* - The null character (U+0000) has a column width of 0.
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* - Other C0/C1 control characters and DEL will lead to a return value
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* of -1.
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* - Non-spacing and enclosing combining characters (general category
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* code Mn or Me in the
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* Unicode database) have a column width of 0.
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* - SOFT HYPHEN (U+00AD) has a column width of 1.
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* - Other format characters (general category code Cf in the Unicode
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* database) and ZERO WIDTH
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* SPACE (U+200B) have a column width of 0.
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* - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF)
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* have a column width of 0.
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* - Spacing characters in the East Asian Wide (W) or East Asian
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* Full-width (F) category as
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* defined in Unicode Technical Report #11 have a column width of 2.
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* - All remaining characters (including all printable ISO 8859-1 and
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* WGL4 characters, Unicode control characters, etc.) have a column
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* width of 1.
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* This implementation assumes that characters are encoded in ISO 10646.
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*/
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function wcswidth(str, opts) {
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if (typeof str !== 'string') return wcwidth(str, opts)
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var s = 0
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for (var i = 0; i < str.length; i++) {
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var n = wcwidth(str.charCodeAt(i), opts)
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if (n < 0) return -1
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s += n
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}
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return s
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}
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function wcwidth(ucs, opts) {
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// test for 8-bit control characters
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if (ucs === 0) return opts.nul
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if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0)) return opts.control
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// binary search in table of non-spacing characters
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if (bisearch(ucs)) return 0
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// if we arrive here, ucs is not a combining or C0/C1 control character
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return 1 +
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(ucs >= 0x1100 &&
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(ucs <= 0x115f || // Hangul Jamo init. consonants
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ucs == 0x2329 || ucs == 0x232a ||
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(ucs >= 0x2e80 && ucs <= 0xa4cf &&
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ucs != 0x303f) || // CJK ... Yi
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(ucs >= 0xac00 && ucs <= 0xd7a3) || // Hangul Syllables
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(ucs >= 0xf900 && ucs <= 0xfaff) || // CJK Compatibility Ideographs
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(ucs >= 0xfe10 && ucs <= 0xfe19) || // Vertical forms
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(ucs >= 0xfe30 && ucs <= 0xfe6f) || // CJK Compatibility Forms
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(ucs >= 0xff00 && ucs <= 0xff60) || // Fullwidth Forms
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(ucs >= 0xffe0 && ucs <= 0xffe6) ||
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(ucs >= 0x20000 && ucs <= 0x2fffd) ||
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(ucs >= 0x30000 && ucs <= 0x3fffd)));
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}
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function bisearch(ucs) {
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var min = 0
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var max = combining.length - 1
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var mid
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if (ucs < combining[0][0] || ucs > combining[max][1]) return false
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while (max >= min) {
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mid = Math.floor((min + max) / 2)
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if (ucs > combining[mid][1]) min = mid + 1
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else if (ucs < combining[mid][0]) max = mid - 1
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else return true
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}
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return false
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}
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