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'use strict';
var _ = require('lodash');
// Taken from the punycode library
function ucs2encode(array) {
return _.map(array, function (value) {
var output = '';
if (value > 0xFFFF) {
value -= 0x10000;
output += String.fromCharCode(value >>> 10 & 0x3FF | 0xD800);
value = 0xDC00 | value & 0x3FF;
}
output += String.fromCharCode(value);
return output;
}).join('');
}
function ucs2decode(string) {
var output = [],
counter = 0,
length = string.length,
value,
extra;
while (counter < length) {
value = string.charCodeAt(counter++);
if (value >= 0xD800 && value <= 0xDBFF && counter < length) {
// high surrogate, and there is a next character
extra = string.charCodeAt(counter++);
if ((extra & 0xFC00) === 0xDC00) { // low surrogate
output.push(((value & 0x3FF) << 10) + (extra & 0x3FF) + 0x10000);
} else {
// unmatched surrogate; only append this code unit, in case the next
// code unit is the high surrogate of a surrogate pair
output.push(value);
counter--;
}
} else {
output.push(value);
}
}
return output;
}
module.exports = {
encode: ucs2encode,
decode: ucs2decode
};