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author | Rebecca Turner <me@re-becca.org> | 2018-05-24 23:31:26 +0300 |
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committer | Rebecca Turner <me@re-becca.org> | 2018-05-24 23:31:38 +0300 |
commit | 0483f5c5deaf18c968a128657923103e49f4e67a (patch) | |
tree | 210f154da2f60938471d96a844dcb32cbda09e2a /node_modules/wcwidth/index.js | |
parent | 6c294614d800cb95a49ef1c422fbdde65b0731a2 (diff) |
Flatten dependencies and add dev deps to git
Diffstat (limited to 'node_modules/wcwidth/index.js')
-rw-r--r-- | node_modules/wcwidth/index.js | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/node_modules/wcwidth/index.js b/node_modules/wcwidth/index.js new file mode 100644 index 000000000..48cbb6020 --- /dev/null +++ b/node_modules/wcwidth/index.js @@ -0,0 +1,99 @@ +"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 +} |