cloudfunctions/SegmentPortraitPic/node_modules/tr46/index.js

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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);

    var target = mappingTable[mid];
    if (target[0][0] <= val && target[0][1] >= val) {
      return target;
    } else if (target[0][0] > val) {
      end = mid - 1;
    } else {
      start = mid + 1;
    }
  }

  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;