com.google.javascript.jscomp.js.es6.string.fromcodepoint.js Maven / Gradle / Ivy
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/*
* Copyright 2016 The Closure Compiler Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'require util/polyfill';
$jscomp.polyfill('String.fromCodePoint', function(orig) {
if (orig) return orig;
/**
* Creates a new string from the given codepoints.
*
* Polyfills the static function String.fromCodePoint().
*
* @param {...number} var_args
* @return {string}
*/
var polyfill = function(var_args) {
// Note: this is taken from v8's harmony-string.js StringFromCodePoint.
var result = '';
for (var i = 0; i < arguments.length; i++) {
var code = Number(arguments[i]);
if (code < 0 || code > 0x10FFFF || code !== Math.floor(code)) {
throw new RangeError('invalid_code_point ' + code);
}
if (code <= 0xFFFF) {
result += String.fromCharCode(code);
} else {
code -= 0x10000;
result += String.fromCharCode((code >>> 10) & 0x3FF | 0xD800);
result += String.fromCharCode(code & 0x3FF | 0xDC00);
}
}
return result;
};
return polyfill;
}, 'es6-impl', 'es3');