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+'use strict';
+
+var ucs2encode = require('./ucs2/encode')
+ , adapt = require('./lib/adapt')
+
+ , floor = Math.floor
+
+/** Highest positive signed 32-bit float value */
+ , maxInt = 2147483647 // aka. 0x7FFFFFFF or 2^31-1
+ , initialN = 128, initialBias = 72, delimiter = '-', base = 36, tMin = 1, tMax = 26;
+
+/**
+ * Converts a basic code point into a digit/integer.
+ * @see `digitToBasic()`
+ * @private
+ * @param {Number} codePoint The basic numeric code point value.
+ * @returns {Number} The numeric value of a basic code point (for use in
+ * representing integers) in the range `0` to `base - 1`, or `base` if
+ * the code point does not represent a value.
+*/
+var basicToDigit = function (codePoint) {
+ if (codePoint - 48 < 10) {
+ return codePoint - 22;
+ }
+ if (codePoint - 65 < 26) {
+ return codePoint - 65;
+ }
+ if (codePoint - 97 < 26) {
+ return codePoint - 97;
+ }
+ return base;
+};
+
+/** Error messages */
+var errors = {
+ overflow: 'Overflow: input needs wider integers to process',
+ 'not-basic': 'Illegal input >= 0x80 (not a basic code point)',
+ 'invalid-input': 'Invalid input'
+};
+
+/**
+ * A generic error utility function.
+ * @private
+ * @param {String} type The error type.
+ * @returns {Error} Throws a `RangeError` with the applicable error message.
+*/
+var error = function (type) {
+ throw new RangeError(errors[type]);
+};
+
+/**
+ * Converts a Punycode string of ASCII-only symbols to a string of Unicode
+ * symbols.
+ * @memberOf punycode
+ * @param {String} input The Punycode string of ASCII-only symbols.
+ * @returns {String} The resulting string of Unicode symbols.
+*/
+module.exports = function (input) {
+ // Don't use UCS-2
+ var output = [],
+ inputLength = input.length,
+ out,
+ i = 0,
+ n = initialN,
+ bias = initialBias,
+ basic,
+ j,
+ index,
+ oldi,
+ w,
+ k,
+ digit,
+ t,
+ /** Cached calculation results */
+ baseMinusT;
+
+ // Handle the basic code points: let `basic` be the number of input code
+ // points before the last delimiter, or `0` if there is none, then copy
+ // the first basic code points to the output.
+
+ basic = input.lastIndexOf(delimiter);
+ if (basic < 0) {
+ basic = 0;
+ }
+
+ for (j = 0; j < basic; ++j) {
+ // if it's not a basic code point
+ if (input.charCodeAt(j) >= 0x80) {
+ error('not-basic');
+ }
+ output.push(input.charCodeAt(j));
+ }
+
+ // Main decoding loop: start just after the last delimiter if any basic code
+ // points were copied; start at the beginning otherwise.
+
+ for (index = basic > 0 ? basic + 1 : 0; index < inputLength; index) {
+
+ // `index` is the index of the next character to be consumed.
+ // Decode a generalized variable-length integer into `delta`,
+ // which gets added to `i`. The overflow checking is easier
+ // if we increase `i` as we go, then subtract off its starting
+ // value at the end to obtain `delta`.
+ for (oldi = i, w = 1, k = base; true; k += base) {
+
+ if (index >= inputLength) {
+ error('invalid-input');
+ }
+
+ digit = basicToDigit(input.charCodeAt(index++));
+
+ if (digit >= base || digit > floor((maxInt - i) / w)) {
+ error('overflow');
+ }
+
+ i += digit * w;
+ t = k <= bias ? tMin : (k >= bias + tMax ? tMax : k - bias);
+
+ if (digit < t) {
+ break;
+ }
+
+ baseMinusT = base - t;
+ if (w > floor(maxInt / baseMinusT)) {
+ error('overflow');
+ }
+
+ w *= baseMinusT;
+
+ }
+
+ out = output.length + 1;
+ bias = adapt(i - oldi, out, oldi === 0);
+
+ // `i` was supposed to wrap around from `out` to `0`,
+ // incrementing `n` each time, so we'll fix that now:
+ if (floor(i / out) > maxInt - n) {
+ error('overflow');
+ }
+
+ n += floor(i / out);
+ i %= out;
+
+ // Insert `n` at position `i` of the output
+ output.splice(i++, 0, n);
+
+ }
+
+ return ucs2encode(output);
+};