mirror of
https://github.com/nodejs/node.git
synced 2025-05-18 22:48:50 +00:00
2d441493a4
PR-URL: https://github.com/nodejs/io.js/pull/2286 Reviewed-By: Roman Reiss <me@silverwind.io>
31 lines
829 B
JavaScript
31 lines
829 B
JavaScript
// Based on:
|
|
// http://norbertlindenberg.com/2012/05/ecmascript-supplementary-characters/
|
|
// and:
|
|
// https://github.com/mathiasbynens/String.fromCodePoint/blob/master
|
|
// /fromcodepoint.js
|
|
|
|
'use strict';
|
|
|
|
var floor = Math.floor, fromCharCode = String.fromCharCode;
|
|
|
|
module.exports = function (codePoint/*, …codePoints*/) {
|
|
var chars = [], l = arguments.length, i, c, result = '';
|
|
for (i = 0; i < l; ++i) {
|
|
c = Number(arguments[i]);
|
|
if (!isFinite(c) || c < 0 || c > 0x10FFFF || floor(c) !== c) {
|
|
throw new RangeError("Invalid code point " + c);
|
|
}
|
|
|
|
if (c < 0x10000) {
|
|
chars.push(c);
|
|
} else {
|
|
c -= 0x10000;
|
|
chars.push((c >> 10) + 0xD800, (c % 0x400) + 0xDC00);
|
|
}
|
|
if (i + 1 !== l && chars.length <= 0x4000) continue;
|
|
result += fromCharCode.apply(null, chars);
|
|
chars.length = 0;
|
|
}
|
|
return result;
|
|
};
|