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Direktori : /lib/node_modules/npm/node_modules/wcwidth/ |
Current File : //lib/node_modules/npm/node_modules/wcwidth/index.js |
"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 }