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'use strict';
module.exports = function is_unicode(vr) {
// eslint-disable-line camelcase
// discuss at: http://locutus.io/php/is_unicode/
// original by: Brett Zamir (http://brett-zamir.me)
// note 1: Almost all strings in JavaScript should be Unicode
// example 1: is_unicode('We the peoples of the United Nations...!')
// returns 1: true
if (typeof vr !== 'string') {
return false;
}
// If surrogates occur outside of high-low pairs, then this is not Unicode
var arr = [];
var highSurrogate = '[\uD800-\uDBFF]';
var lowSurrogate = '[\uDC00-\uDFFF]';
var highSurrogateBeforeAny = new RegExp(highSurrogate + '([\\s\\S])', 'g');
var lowSurrogateAfterAny = new RegExp('([\\s\\S])' + lowSurrogate, 'g');
var singleLowSurrogate = new RegExp('^' + lowSurrogate + '$');
var singleHighSurrogate = new RegExp('^' + highSurrogate + '$');
while ((arr = highSurrogateBeforeAny.exec(vr)) !== null) {
if (!arr[1] || !arr[1].match(singleLowSurrogate)) {
// If high not followed by low surrogate
return false;
}
}
while ((arr = lowSurrogateAfterAny.exec(vr)) !== null) {
if (!arr[1] || !arr[1].match(singleHighSurrogate)) {
// If low not preceded by high surrogate
return false;
}
}
return true;
};
//# sourceMappingURL=is_unicode.js.map
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