planning

node_modules/react-redux/lib/connect/selectorFactory.js

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+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault")["default"];
+
+exports.__esModule = true;
+exports["default"] = finalPropsSelectorFactory;
+exports.impureFinalPropsSelectorFactory = impureFinalPropsSelectorFactory;
+exports.pureFinalPropsSelectorFactory = pureFinalPropsSelectorFactory;
+
+var _objectWithoutPropertiesLoose2 = _interopRequireDefault(require("@babel/runtime/helpers/objectWithoutPropertiesLoose"));
+
+var _verifySubselectors = _interopRequireDefault(require("./verifySubselectors"));
+
+var _excluded = ["initMapStateToProps", "initMapDispatchToProps", "initMergeProps"];
+
+function impureFinalPropsSelectorFactory(mapStateToProps, mapDispatchToProps, mergeProps, dispatch) {
+  return function impureFinalPropsSelector(state, ownProps) {
+    return mergeProps(mapStateToProps(state, ownProps), mapDispatchToProps(dispatch, ownProps), ownProps);
+  };
+}
+
+function pureFinalPropsSelectorFactory(mapStateToProps, mapDispatchToProps, mergeProps, dispatch, _ref) {
+  var areStatesEqual = _ref.areStatesEqual,
+      areOwnPropsEqual = _ref.areOwnPropsEqual,
+      areStatePropsEqual = _ref.areStatePropsEqual;
+  var hasRunAtLeastOnce = false;
+  var state;
+  var ownProps;
+  var stateProps;
+  var dispatchProps;
+  var mergedProps;
+
+  function handleFirstCall(firstState, firstOwnProps) {
+    state = firstState;
+    ownProps = firstOwnProps;
+    stateProps = mapStateToProps(state, ownProps);
+    dispatchProps = mapDispatchToProps(dispatch, ownProps);
+    mergedProps = mergeProps(stateProps, dispatchProps, ownProps);
+    hasRunAtLeastOnce = true;
+    return mergedProps;
+  }
+
+  function handleNewPropsAndNewState() {
+    stateProps = mapStateToProps(state, ownProps);
+    if (mapDispatchToProps.dependsOnOwnProps) dispatchProps = mapDispatchToProps(dispatch, ownProps);
+    mergedProps = mergeProps(stateProps, dispatchProps, ownProps);
+    return mergedProps;
+  }
+
+  function handleNewProps() {
+    if (mapStateToProps.dependsOnOwnProps) stateProps = mapStateToProps(state, ownProps);
+    if (mapDispatchToProps.dependsOnOwnProps) dispatchProps = mapDispatchToProps(dispatch, ownProps);
+    mergedProps = mergeProps(stateProps, dispatchProps, ownProps);
+    return mergedProps;
+  }
+
+  function handleNewState() {
+    var nextStateProps = mapStateToProps(state, ownProps);
+    var statePropsChanged = !areStatePropsEqual(nextStateProps, stateProps);
+    stateProps = nextStateProps;
+    if (statePropsChanged) mergedProps = mergeProps(stateProps, dispatchProps, ownProps);
+    return mergedProps;
+  }
+
+  function handleSubsequentCalls(nextState, nextOwnProps) {
+    var propsChanged = !areOwnPropsEqual(nextOwnProps, ownProps);
+    var stateChanged = !areStatesEqual(nextState, state, nextOwnProps, ownProps);
+    state = nextState;
+    ownProps = nextOwnProps;
+    if (propsChanged && stateChanged) return handleNewPropsAndNewState();
+    if (propsChanged) return handleNewProps();
+    if (stateChanged) return handleNewState();
+    return mergedProps;
+  }
+
+  return function pureFinalPropsSelector(nextState, nextOwnProps) {
+    return hasRunAtLeastOnce ? handleSubsequentCalls(nextState, nextOwnProps) : handleFirstCall(nextState, nextOwnProps);
+  };
+} // TODO: Add more comments
+// If pure is true, the selector returned by selectorFactory will memoize its results,
+// allowing connectAdvanced's shouldComponentUpdate to return false if final
+// props have not changed. If false, the selector will always return a new
+// object and shouldComponentUpdate will always return true.
+
+
+function finalPropsSelectorFactory(dispatch, _ref2) {
+  var initMapStateToProps = _ref2.initMapStateToProps,
+      initMapDispatchToProps = _ref2.initMapDispatchToProps,
+      initMergeProps = _ref2.initMergeProps,
+      options = (0, _objectWithoutPropertiesLoose2["default"])(_ref2, _excluded);
+  var mapStateToProps = initMapStateToProps(dispatch, options);
+  var mapDispatchToProps = initMapDispatchToProps(dispatch, options);
+  var mergeProps = initMergeProps(dispatch, options);
+
+  if (process.env.NODE_ENV !== 'production') {
+    (0, _verifySubselectors["default"])(mapStateToProps, mapDispatchToProps, mergeProps, options.displayName);
+  }
+
+  var selectorFactory = options.pure ? pureFinalPropsSelectorFactory : impureFinalPropsSelectorFactory;
+  return selectorFactory(mapStateToProps, mapDispatchToProps, mergeProps, dispatch, options);
+}