text: var zrUtil = require("zrender/lib/core/util");
  
  var VisualMapping = require("./VisualMapping");
  
  /**
   * @file Visual solution, for consistent option specification.
   */
  var each = zrUtil.each;
  
  function hasKeys(obj) {
    if (obj) {
      for (var name in obj) {
        if (obj.hasOwnProperty(name)) {
          return true;
        }
      }
    }
  }
  /**
   * @param {Object} option
   * @param {Array.<string>} stateList
   * @param {Function} [supplementVisualOption]
   * @return {Object} visualMappings <state, <visualType, module:echarts/visual/VisualMapping>>
   */
  
  
  function createVisualMappings(option, stateList, supplementVisualOption) {
    var visualMappings = {};
    each(stateList, function (state) {
      var mappings = visualMappings[state] = createMappings();
      each(option[state], function (visualData, visualType) {
        if (!VisualMapping.isValidType(visualType)) {
          return;
        }
  
        var mappingOption = {
          type: visualType,
          visual: visualData
        };
        supplementVisualOption && supplementVisualOption(mappingOption, state);
        mappings[visualType] = new VisualMapping(mappingOption); // Prepare a alpha for opacity, for some case that opacity
        // is not supported, such as rendering using gradient color.
  
        if (visualType === 'opacity') {
          mappingOption = zrUtil.clone(mappingOption);
          mappingOption.type = 'colorAlpha';
          mappings.__hidden.__alphaForOpacity = new VisualMapping(mappingOption);
        }
      });
    });
    return visualMappings;
  
    function createMappings() {
      var Creater = function () {}; // Make sure hidden fields will not be visited by
      // object iteration (with hasOwnProperty checking).
  
  
      Creater.prototype.__hidden = Creater.prototype;
      var obj = new Creater();
      return obj;
    }
  }
  /**
   * @param {Object} thisOption
   * @param {Object} newOption
   * @param {Array.<string>} keys
   */
  
  
  function replaceVisualOption(thisOption, newOption, keys) {
    // Visual attributes merge is not supported, otherwise it
    // brings overcomplicated merge logic. See #2853. So if
    // newOption has anyone of these keys, all of these keys
    // will be reset. Otherwise, all keys remain.
    var has;
    zrUtil.each(keys, function (key) {
      if (newOption.hasOwnProperty(key) && hasKeys(newOption[key])) {
        has = true;
      }
    });
    has && zrUtil.each(keys, function (key) {
      if (newOption.hasOwnProperty(key) && hasKeys(newOption[key])) {
        thisOption[key] = zrUtil.clone(newOption[key]);
      } else {
        delete thisOption[key];
      }
    });
  }
  /**
   * @param {Array.<string>} stateList
   * @param {Object} visualMappings <state, Object.<visualType, module:echarts/visual/VisualMapping>>
   * @param {module:echarts/data/List} list
   * @param {Function} getValueState param: valueOrIndex, return: state.
   * @param {object} [scope] Scope for getValueState
   * @param {string} [dimension] Concrete dimension, if used.
   */
  
  
  function applyVisual(stateList, visualMappings, data, getValueState, scope, dimension) {
    var visualTypesMap = {};
    zrUtil.each(stateList, function (state) {
      var visualTypes = VisualMapping.prepareVisualTypes(visualMappings[state]);
      visualTypesMap[state] = visualTypes;
    });
    var dataIndex;
  
    function getVisual(key) {
      return data.getItemVisual(dataIndex, key);
    }
  
    function setVisual(key, value) {
      data.setItemVisual(dataIndex, key, value);
    }
  
    if (dimension == null) {
      data.each(eachItem, true);
    } else {
      data.each([dimension], eachItem, true);
    }
  
    function eachItem(valueOrIndex, index) {
      dataIndex = dimension == null ? valueOrIndex : index;
      var rawDataItem = data.getRawDataItem(dataIndex); // Consider performance
  
      if (rawDataItem && rawDataItem.visualMap === false) {
        return;
      }
  
      var valueState = getValueState.call(scope, valueOrIndex);
      var mappings = visualMappings[valueState];
      var visualTypes = visualTypesMap[valueState];
  
      for (var i = 0, len = visualTypes.length; i < len; i++) {
        var type = visualTypes[i];
        mappings[type] && mappings[type].applyVisual(valueOrIndex, getVisual, setVisual);
      }
    }
  }
  
  exports.createVisualMappings = createVisualMappings;
  exports.replaceVisualOption = replaceVisualOption;
  exports.applyVisual = applyVisual;