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Dir : ~/usr/share/nodejs/core-js/internals/

Edit File: string-punycode-to-ascii.js

'use strict';
// based on https://github.com/bestiejs/punycode.js/blob/master/punycode.js
var uncurryThis = require('../internals/function-uncurry-this');

var maxInt = 2147483647; // aka. 0x7FFFFFFF or 2^31-1
var base = 36;
var tMin = 1;
var tMax = 26;
var skew = 38;
var damp = 700;
var initialBias = 72;
var initialN = 128; // 0x80
var delimiter = '-'; // '\x2D'
var regexNonASCII = /[^\0-\u007E]/; // non-ASCII chars
var regexSeparators = /[.\u3002\uFF0E\uFF61]/g; // RFC 3490 separators
var OVERFLOW_ERROR = 'Overflow: input needs wider integers to process';
var baseMinusTMin = base - tMin;

var $RangeError = RangeError;
var exec = uncurryThis(regexSeparators.exec);
var floor = Math.floor;
var fromCharCode = String.fromCharCode;
var charCodeAt = uncurryThis(''.charCodeAt);
var join = uncurryThis([].join);
var push = uncurryThis([].push);
var replace = uncurryThis(''.replace);
var split = uncurryThis(''.split);
var toLowerCase = uncurryThis(''.toLowerCase);

/**
 * Creates an array containing the numeric code points of each Unicode
 * character in the string. While JavaScript uses UCS-2 internally,
 * this function will convert a pair of surrogate halves (each of which
 * UCS-2 exposes as separate characters) into a single code point,
 * matching UTF-16.
 */
var ucs2decode = function (string) {
  var output = [];
  var counter = 0;
  var length = string.length;
  while (counter < length) {
    var value = charCodeAt(string, counter++);
    if (value >= 0xD800 && value <= 0xDBFF && counter < length) {
      // It's a high surrogate, and there is a next character.
      var extra = charCodeAt(string, counter++);
      if ((extra & 0xFC00) == 0xDC00) { // Low surrogate.
        push(output, ((value & 0x3FF) << 10) + (extra & 0x3FF) + 0x10000);
      } else {
        // It's an unmatched surrogate; only append this code unit, in case the
        // next code unit is the high surrogate of a surrogate pair.
        push(output, value);
        counter--;
      }
    } else {
      push(output, value);
    }
  }
  return output;
};

/**
 * Converts a digit/integer into a basic code point.
 */
var digitToBasic = function (digit) {
  //  0..25 map to ASCII a..z or A..Z
  // 26..35 map to ASCII 0..9
  return digit + 22 + 75 * (digit < 26);
};

/**
 * Bias adaptation function as per section 3.4 of RFC 3492.
 * https://tools.ietf.org/html/rfc3492#section-3.4
 */
var adapt = function (delta, numPoints, firstTime) {
  var k = 0;
  delta = firstTime ? floor(delta / damp) : delta >> 1;
  delta += floor(delta / numPoints);
  while (delta > baseMinusTMin * tMax >> 1) {
    delta = floor(delta / baseMinusTMin);
    k += base;
  }
  return floor(k + (baseMinusTMin + 1) * delta / (delta + skew));
};

/**
 * Converts a string of Unicode symbols (e.g. a domain name label) to a
 * Punycode string of ASCII-only symbols.
 */
var encode = function (input) {
  var output = [];

// Convert the input in UCS-2 to an array of Unicode code points.
  input = ucs2decode(input);

// Cache the length.
  var inputLength = input.length;

// Initialize the state.
  var n = initialN;
  var delta = 0;
  var bias = initialBias;
  var i, currentValue;

// Handle the basic code points.
  for (i = 0; i < input.length; i++) {
    currentValue = input[i];
    if (currentValue < 0x80) {
      push(output, fromCharCode(currentValue));
    }
  }

var basicLength = output.length; // number of basic code points.
  var handledCPCount = basicLength; // number of code points that have been handled;

// Finish the basic string with a delimiter unless it's empty.
  if (basicLength) {
    push(output, delimiter);
  }

// Main encoding loop:
  while (handledCPCount < inputLength) {
    // All non-basic code points < n have been handled already. Find the next larger one:
    var m = maxInt;
    for (i = 0; i < input.length; i++) {
      currentValue = input[i];
      if (currentValue >= n && currentValue < m) {
        m = currentValue;
      }
    }

// Increase `delta` enough to advance the decoder's <n,i> state to <m,0>, but guard against overflow.
    var handledCPCountPlusOne = handledCPCount + 1;
    if (m - n > floor((maxInt - delta) / handledCPCountPlusOne)) {
      throw $RangeError(OVERFLOW_ERROR);
    }

delta += (m - n) * handledCPCountPlusOne;
    n = m;

for (i = 0; i < input.length; i++) {
      currentValue = input[i];
      if (currentValue < n && ++delta > maxInt) {
        throw $RangeError(OVERFLOW_ERROR);
      }
      if (currentValue == n) {
        // Represent delta as a generalized variable-length integer.
        var q = delta;
        var k = base;
        while (true) {
          var t = k <= bias ? tMin : (k >= bias + tMax ? tMax : k - bias);
          if (q < t) break;
          var qMinusT = q - t;
          var baseMinusT = base - t;
          push(output, fromCharCode(digitToBasic(t + qMinusT % baseMinusT)));
          q = floor(qMinusT / baseMinusT);
          k += base;
        }

push(output, fromCharCode(digitToBasic(q)));
        bias = adapt(delta, handledCPCountPlusOne, handledCPCount == basicLength);
        delta = 0;
        handledCPCount++;
      }
    }

delta++;
    n++;
  }
  return join(output, '');
};

module.exports = function (input) {
  var encoded = [];
  var labels = split(replace(toLowerCase(input), regexSeparators, '\u002E'), '.');
  var i, label;
  for (i = 0; i < labels.length; i++) {
    label = labels[i];
    push(encoded, exec(regexNonASCII, label) ? 'xn--' + encode(label) : label);
  }
  return join(encoded, '.');
};