bdn-pocket/lib/selector/slice_selector.js

pocket tools for managing redux and redux-saga

'use strict';

exports.__esModule = true;

var _it = require('@stamp/it');

var _it2 = _interopRequireDefault(_it);

var _selector_def = require('./selector_def');

var _selector_def2 = _interopRequireDefault(_selector_def);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

var SliceSelector = (0, _it2.default)(_selector_def2.default).init(function (_ref, _ref2) {
  var reducer = _ref.reducer;
  var stamp = _ref2.stamp,
      instance = _ref2.instance;
  var PropTypes = stamp.compose.staticProperties.PropTypes;
  var getSubState = instance.getSubState;

  var isSubStateCacheValid = (0, _selector_def.makeIsCacheValid)(function (r, l) {
    return r === l;
  });

  var lastPartialReducer = void 0;

  /**
   * propsReducer generate a partial reducer function
   * that is memoized (lastPartialReducer)
   * if props is sent, propsReducer execute the partial reducer
   * else it return the partial reducer
   */
  return function propsReducer(state, props) {
    var subStates = getSubState(state);
    if (!isSubStateCacheValid(subStates)) {
      lastPartialReducer = function lastPartialReducer(props) {
        PropTypes(props);
        return reducer(subStates, props);
      };
    }

    return arguments.length > 1 ? lastPartialReducer(props) : lastPartialReducer;
  };
});

exports.default = SliceSelector;