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File: BoxUtils.js
/**
 * BoxUtils.js
 *
 * Released under LGPL License.
 * Copyright (c) 1999-2017 Ephox Corp. All rights reserved
 *
 * License: http://www.tinymce.com/license
 * Contributing: http://www.tinymce.com/contributing
 */

/**
 * Utility class for box parsing and measuring.
 *
 * @private
 * @class tinymce.ui.BoxUtils
 */
define(
  'tinymce.core.ui.BoxUtils',
  [
  ],
  function () {
    "use strict";

    return {
      /**
       * Parses the specified box value. A box value contains 1-4 properties in clockwise order.
       *
       * @method parseBox
       * @param {String/Number} value Box value "0 1 2 3" or "0" etc.
       * @return {Object} Object with top/right/bottom/left properties.
       * @private
       */
      parseBox: function (value) {
        var len, radix = 10;

        if (!value) {
          return;
        }

        if (typeof value === "number") {
          value = value || 0;

          return {
            top: value,
            left: value,
            bottom: value,
            right: value
          };
        }

        value = value.split(' ');
        len = value.length;

        if (len === 1) {
          value[1] = value[2] = value[3] = value[0];
        } else if (len === 2) {
          value[2] = value[0];
          value[3] = value[1];
        } else if (len === 3) {
          value[3] = value[1];
        }

        return {
          top: parseInt(value[0], radix) || 0,
          right: parseInt(value[1], radix) || 0,
          bottom: parseInt(value[2], radix) || 0,
          left: parseInt(value[3], radix) || 0
        };
      },

      measureBox: function (elm, prefix) {
        function getStyle(name) {
          var defaultView = document.defaultView;

          if (defaultView) {
            // Remove camelcase
            name = name.replace(/[A-Z]/g, function (a) {
              return '-' + a;
            });

            return defaultView.getComputedStyle(elm, null).getPropertyValue(name);
          }

          return elm.currentStyle[name];
        }

        function getSide(name) {
          var val = parseFloat(getStyle(name), 10);

          return isNaN(val) ? 0 : val;
        }

        return {
          top: getSide(prefix + "TopWidth"),
          right: getSide(prefix + "RightWidth"),
          bottom: getSide(prefix + "BottomWidth"),
          left: getSide(prefix + "LeftWidth")
        };
      }
    };
  }
);