debian-mirror-gitlab/core-js/modules/es.string.from-code-point.js
2019-09-25 13:30:05 +05:30

27 lines
999 B
JavaScript

var $ = require('../internals/export');
var toAbsoluteIndex = require('../internals/to-absolute-index');
var fromCharCode = String.fromCharCode;
var nativeFromCodePoint = String.fromCodePoint;
// length should be 1, old FF problem
var INCORRECT_LENGTH = !!nativeFromCodePoint && nativeFromCodePoint.length != 1;
// `String.fromCodePoint` method
// https://tc39.github.io/ecma262/#sec-string.fromcodepoint
$({ target: 'String', stat: true, forced: INCORRECT_LENGTH }, {
fromCodePoint: function fromCodePoint(x) { // eslint-disable-line no-unused-vars
var elements = [];
var length = arguments.length;
var i = 0;
var code;
while (length > i) {
code = +arguments[i++];
if (toAbsoluteIndex(code, 0x10FFFF) !== code) throw RangeError(code + ' is not a valid code point');
elements.push(code < 0x10000
? fromCharCode(code)
: fromCharCode(((code -= 0x10000) >> 10) + 0xD800, code % 0x400 + 0xDC00)
);
} return elements.join('');
}
});