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File: StringMapper.js

/**
 * StringMapper.js
 *
 * Released under LGPL License.
 * Copyright (c) 1999-2016 Ephox Corp. All rights reserved
 *
 * License: http://www.tinymce.com/license
 * Contributing: http://www.tinymce.com/contributing
 */
define(
  'tinymce.plugins.wordcount.text.StringMapper',
  [
    'tinymce.plugins.wordcount.text.UnicodeData',
    'tinymce.plugins.wordcount.alien.Arr'
  ],
  function (UnicodeData, Arr) {
    var SETS = UnicodeData.SETS;
    var OTHER = UnicodeData.characterIndices.OTHER;

    var getType = function (char) {
      var j, set, type = OTHER;
      var setsLength = SETS.length;
      for (j = 0; j < setsLength; ++j) {
        set = SETS[j];

        if (set && set.test(char)) {
          type = j;
          break;
        }
      }
      return type;
    };

    var memoize = function (func) {
      var cache = {};
      return function (char) {
        if (cache[char]) {
          return cache[char];
        } else {
          var result = func(char);
          cache[char] = result;
          return result;
        }
      };
    };

    var classify = function (string) {
      var memoized = memoize(getType);
      return Arr.map(string.split(''), memoized);
    };

    return {
      classify: classify
    };
  }
);