michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: 
michael@0: if (typeof isHighSurrogate === 'undefined') {
michael@0:     var isHighSurrogate = function isHighSurrogate(s) {
michael@0:         var c = s.charCodeAt(0);
michael@0:         return c >= 0xD800 && c <= 0xDBFF;
michael@0:     }
michael@0: }
michael@0: 
michael@0: if (typeof isLowSurrogate === 'undefined') {
michael@0:     var isLowSurrogate = function isLowSurrogate(s) {
michael@0:         var c = s.charCodeAt(0);
michael@0:         return c >= 0xDC00 && c <= 0xDFFF;
michael@0:     }
michael@0: }
michael@0: 
michael@0: if (typeof isSurrogatePair === 'undefined') {
michael@0:     var isSurrogatePair = function isSurrogatePair(s) {
michael@0:         return s.length == 2 && isHighSurrogate(s[0]) && isLowSurrogate(s[1]);
michael@0:     }
michael@0: }