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"use strict";

var punycode = require("punycode");
var mappingTable = require("./lib/mappingTable.json");

var PROCESSING_OPTIONS = {
  TRANSITIONAL: 0,
  NONTRANSITIONAL: 1
};

function normalize(str) { // fix bug in v8
  return str.split('\u0000').map(function (s) { return s.normalize('NFC'); }).join('\u0000');
}

function findStatus(val) {
  var start = 0;
  var end = mappingTable.length - 1;

while (start <= end) {
    var mid = Math.floor((start + end) / 2);

return null;
}

var regexAstralSymbols = /[\uD800-\uDBFF][\uDC00-\uDFFF]/g;

function countSymbols(string) {
  return string
    // replace every surrogate pair with a BMP symbol
    .replace(regexAstralSymbols, '_')
    // then get the length
    .length;
}

function mapChars(domain_name, useSTD3, processing_option) {
  var hasError = false;
  var processed = "";

var len = countSymbols(domain_name);
  for (var i = 0; i < len; ++i) {
    var codePoint = domain_name.codePointAt(i);
    var status = findStatus(codePoint);

switch (status[1]) {
      case "disallowed":
        hasError = true;
        processed += String.fromCodePoint(codePoint);
        break;
      case "ignored":
        break;
      case "mapped":
        processed += String.fromCodePoint.apply(String, status[2]);
        break;
      case "deviation":
        if (processing_option === PROCESSING_OPTIONS.TRANSITIONAL) {
          processed += String.fromCodePoint.apply(String, status[2]);
        } else {
          processed += String.fromCodePoint(codePoint);
        }
        break;
      case "valid":
        processed += String.fromCodePoint(codePoint);
        break;
      case "disallowed_STD3_mapped":
        if (useSTD3) {
          hasError = true;
          processed += String.fromCodePoint(codePoint);
        } else {
          processed += String.fromCodePoint.apply(String, status[2]);
        }
        break;
      case "disallowed_STD3_valid":
        if (useSTD3) {
          hasError = true;
        }

processed += String.fromCodePoint(codePoint);
        break;
    }
  }

return {
    string: processed,
    error: hasError
  };
}

var combiningMarksRegex = /[\u0300-\u036F\u0483-\u0489\u0591-\u05BD\u05BF\u05C1\u05C2\u05C4\u05C5\u05C7\u0610-\u061A\u064B-\u065F\u0670\u06D6-\u06DC\u06DF-\u06E4\u06E7\u06E8\u06EA-\u06ED\u0711\u0730-\u074A\u07A6-\u07B0\u07EB-\u07F3\u0816-\u0819\u081B-\u0823\u0825-\u0827\u0829-\u082D\u0859-\u085B\u08E4-\u0903\u093A-\u093C\u093E-\u094F\u0951-\u0957\u0962\u0963\u0981-\u0983\u09BC\u09BE-\u09C4\u09C7\u09C8\u09CB-\u09CD\u09D7\u09E2\u09E3\u0A01-\u0A03\u0A3C\u0A3E-\u0A42\u0A47\u0A48\u0A4B-\u0A4D\u0A51\u0A70\u0A71\u0A75\u0A81-\u0A83\u0ABC\u0ABE-\u0AC5\u0AC7-\u0AC9\u0ACB-\u0ACD\u0AE2\u0AE3\u0B01-\u0B03\u0B3C\u0B3E-\u0B44\u0B47\u0B48\u0B4B-\u0B4D\u0B56\u0B57\u0B62\u0B63\u0B82\u0BBE-\u0BC2\u0BC6-\u0BC8\u0BCA-\u0BCD\u0BD7\u0C00-\u0C03\u0C3E-\u0C44\u0C46-\u0C48\u0C4A-\u0C4D\u0C55\u0C56\u0C62\u0C63\u0C81-\u0C83\u0CBC\u0CBE-\u0CC4\u0CC6-\u0CC8\u0CCA-\u0CCD\u0CD5\u0CD6\u0CE2\u0CE3\u0D01-\u0D03\u0D3E-\u0D44\u0D46-\u0D48\u0D4A-\u0D4D\u0D57\u0D62\u0D63\u0D82\u0D83\u0DCA\u0DCF-\u0DD4\u0DD6\u0DD8-\u0DDF\u0DF2\u0DF3\u0E31\u0E34-\u0E3A\u0E47-\u0E4E\u0EB1\u0EB4-\u0EB9\u0EBB\u0EBC\u0EC8-\u0ECD\u0F18\u0F19\u0F35\u0F37\u0F39\u0F3E\u0F3F\u0F71-\u0F84\u0F86\u0F87\u0F8D-\u0F97\u0F99-\u0FBC\u0FC6\u102B-\u103E\u1056-\u1059\u105E-\u1060\u1062-\u1064\u1067-\u106D\u1071-\u1074\u1082-\u108D\u108F\u109A-\u109D\u135D-\u135F\u1712-\u1714\u1732-\u1734\u1752\u1753\u1772\u1773\u17B4-\u17D3\u17DD\u180B-\u180D\u18A9\u1920-\u192B\u1930-\u193B\u19B0-\u19C0\u19C8\u19C9\u1A17-\u1A1B\u1A55-\u1A5E\u1A60-\u1A7C\u1A7F\u1AB0-\u1ABE\u1B00-\u1B04\u1B34-\u1B44\u1B6B-\u1B73\u1B80-\u1B82\u1BA1-\u1BAD\u1BE6-\u1BF3\u1C24-\u1C37\u1CD0-\u1CD2\u1CD4-\u1CE8\u1CED\u1CF2-\u1CF4\u1CF8\u1CF9\u1DC0-\u1DF5\u1DFC-\u1DFF\u20D0-\u20F0\u2CEF-\u2CF1\u2D7F\u2DE0-\u2DFF\u302A-\u302F\u3099\u309A\uA66F-\uA672\uA674-\uA67D\uA69F\uA6F0\uA6F1\uA802\uA806\uA80B\uA823-\uA827\uA880\uA881\uA8B4-\uA8C4\uA8E0-\uA8F1\uA926-\uA92D\uA947-\uA953\uA980-\uA983\uA9B3-\uA9C0\uA9E5\uAA29-\uAA36\uAA43\uAA4C\uAA4D\uAA7B-\uAA7D\uAAB0\uAAB2-\uAAB4\uAAB7\uAAB8\uAABE\uAABF\uAAC1\uAAEB-\uAAEF\uAAF5\uAAF6\uABE3-\uABEA\uABEC\uABED\uFB1E\uFE00-\uFE0F\uFE20-\uFE2D]|\uD800[\uDDFD\uDEE0\uDF76-\uDF7A]|\uD802[\uDE01-\uDE03\uDE05\uDE06\uDE0C-\uDE0F\uDE38-\uDE3A\uDE3F\uDEE5\uDEE6]|\uD804[\uDC00-\uDC02\uDC38-\uDC46\uDC7F-\uDC82\uDCB0-\uDCBA\uDD00-\uDD02\uDD27-\uDD34\uDD73\uDD80-\uDD82\uDDB3-\uDDC0\uDE2C-\uDE37\uDEDF-\uDEEA\uDF01-\uDF03\uDF3C\uDF3E-\uDF44\uDF47\uDF48\uDF4B-\uDF4D\uDF57\uDF62\uDF63\uDF66-\uDF6C\uDF70-\uDF74]|\uD805[\uDCB0-\uDCC3\uDDAF-\uDDB5\uDDB8-\uDDC0\uDE30-\uDE40\uDEAB-\uDEB7]|\uD81A[\uDEF0-\uDEF4\uDF30-\uDF36]|\uD81B[\uDF51-\uDF7E\uDF8F-\uDF92]|\uD82F[\uDC9D\uDC9E]|\uD834[\uDD65-\uDD69\uDD6D-\uDD72\uDD7B-\uDD82\uDD85-\uDD8B\uDDAA-\uDDAD\uDE42-\uDE44]|\uD83A[\uDCD0-\uDCD6]|\uDB40[\uDD00-\uDDEF]/;

function validateLabel(label, processing_option) {
  if (label.substr(0, 4) === "xn--") {
    label = punycode.toUnicode(label);
    processing_option = PROCESSING_OPTIONS.NONTRANSITIONAL;
  }

var error = false;

if (normalize(label) !== label ||
      (label[3] === "-" && label[4] === "-") ||
      label[0] === "-" || label[label.length - 1] === "-" ||
      label.indexOf(".") !== -1 ||
      label.search(combiningMarksRegex) === 0) {
    error = true;
  }

var len = countSymbols(label);
  for (var i = 0; i < len; ++i) {
    var status = findStatus(label.codePointAt(i));
    if ((processing === PROCESSING_OPTIONS.TRANSITIONAL && status[1] !== "valid") ||
        (processing === PROCESSING_OPTIONS.NONTRANSITIONAL &&
         status[1] !== "valid" && status[1] !== "deviation")) {
      error = true;
      break;
    }
  }

return {
    label: label,
    error: error
  };
}

function processing(domain_name, useSTD3, processing_option) {
  var result = mapChars(domain_name, useSTD3, processing_option);
  result.string = normalize(result.string);

return {
    string: labels.join("."),
    error: result.error
  };
}

module.exports.toASCII = function(domain_name, useSTD3, processing_option, verifyDnsLength) {
  var result = processing(domain_name, useSTD3, processing_option);
  var labels = result.string.split(".");
  labels = labels.map(function(l) {
    try {
      return punycode.toASCII(l);
    } catch(e) {
      result.error = true;
      return l;
    }
  });

if (verifyDnsLength) {
    var total = labels.slice(0, labels.length - 1).join(".").length;
    if (total.length > 253 || total.length === 0) {
      result.error = true;
    }

for (var i=0; i < labels.length; ++i) {
      if (labels.length > 63 || labels.length === 0) {
        result.error = true;
        break;
      }
    }
  }

if (result.error) return null;
  return labels.join(".");
};

module.exports.toUnicode = function(domain_name, useSTD3) {
  var result = processing(domain_name, useSTD3, PROCESSING_OPTIONS.NONTRANSITIONAL);

return {
    domain: result.string,
    error: result.error
  };
};

module.exports.PROCESSING_OPTIONS = PROCESSING_OPTIONS;

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