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| import React, { isValidElement } from 'react';
import _ from 'lodash';
import { logger } from './logger';
export function getDeepPaths (obj, path=[]) {
return _.reduce(obj, (terminalKeys, value, key) => (
_.isPlainObject(value) ?
terminalKeys.concat(getDeepPaths(value, path.concat(key))) :
terminalKeys.concat([path.concat(key)])
), []);
}
export function omitFunctionPropsDeep(obj) {
return _.reduce(obj, (memo, value, key) => {
if (_.isPlainObject(value)) {
memo[key] = omitFunctionPropsDeep(value);
} else if (!_.isFunction(value)) {
memo[key] = value;
}
return memo;
}, {});
}
export function bindReducerToState(reducerFunction, { getState, setState }, path=[]) {
let localPath = _.take(path, _.size(path) - 1);
return _.assign(function (...args) {
if (_.isEmpty(localPath)) {
setState(reducerFunction(getState(), ...args));
} else {
let localNextState = reducerFunction(_.get(getState(), localPath), ...args);
setState(_.set(_.clone(getState()), localPath, localNextState));
}
}, { path });
}
export function bindReducersToState(reducers, { getState, setState }) {
return _.reduce(getDeepPaths(reducers), (memo, path) => {
return _.set(memo, path, bindReducerToState(_.get(reducers, path), { getState, setState }, path));
}, {});
}
export function getStatefulPropsContext(reducers, { getState, setState }) {
const boundReducers = bindReducersToState(reducers, { getState, setState });
const combineFunctionsCustomizer = (objValue, srcValue) => {
if (_.isFunction(srcValue) && _.isFunction(objValue)) {
return function (...args) {
objValue(...args);
return srcValue(...args);
};
}
return safeMerge(objValue, srcValue);
};
const bindFunctionOverwritesCustomizer = (objValue, srcValue) => {
if (_.isFunction(srcValue) && _.isFunction(objValue)) {
return bindReducerToState(srcValue, { getState, setState }, objValue.path);
}
return safeMerge(objValue, srcValue);
};
return {
getPropReplaceReducers(props) {
return _.mergeWith({}, boundReducers, getState(), props, bindFunctionOverwritesCustomizer);
},
getProps(props) {
return _.mergeWith({}, boundReducers, getState(), props, combineFunctionsCustomizer);
},
};
}
/**
* reduceSelectors
*
* Generates a root selector from a tree of selectors
* @param {Object} selectors - a tree of selectors
* @returns {function} root selector that when called with state, calls each of
* the selectors in the tree with the state local to that selector
*/
export function reduceSelectors(selectors) {
return function reducedSelector(state) {
return _.reduce(selectors, (state, selector, key) => ({
...state,
[key]: _.isFunction(selector) ?
selector(state) :
reduceSelectors(selector)(state[key]),
}), state);
};
}
export function safeMerge(objValue, srcValue) {
// don't merge arrays
if (_.isArray(srcValue) && _.isArray(objValue)) {
return srcValue;
}
// guards against traversing react elements which can cause cyclical recursion
// If we don't have this clause, lodash (as of 4.7.0) will attempt to
// deeply clone the react children, which is really freaking slow.
if (isValidElement(srcValue)
|| (_.isArray(srcValue) && _.some(srcValue, isValidElement))
|| (_.isArray(srcValue) && _.isUndefined(objValue))
) {
return srcValue;
}
}
export function buildHybridComponent(baseComponent, {
replaceEvents = false, // if true, function props replace the existing reducers, else they are invoked *after* state reducer returns
reducers = _.get(baseComponent, 'definition.statics.reducers', {}),
selectors = _.get(baseComponent, 'definition.statics.selectors', {}),
} = {}) {
const {
_isLucidHybridComponent,
displayName,
propTypes,
definition: {
statics = {},
} = {},
} = baseComponent;
if (_isLucidHybridComponent) {
logger.warnOnce(
displayName,
`Lucid: you are trying to apply buildHybridComponent to ${displayName}, which is already a hybrid component. Lucid exports hybrid components by default. To access the dumb components, use the -Dumb suffix, e.g. "ComponentDumb"`
);
return baseComponent;
}
const selector = reduceSelectors(selectors);
return React.createClass({
propTypes,
statics: {
_isLucidHybridComponent: true,
...statics,
},
displayName,
getInitialState() {
const { initialState } = this.props; //initial state overrides
return _.mergeWith({}, omitFunctionPropsDeep(baseComponent.getDefaultProps()), initialState, omitFunctionPropsDeep(this.props), safeMerge);
},
componentWillMount() {
this.boundContext = getStatefulPropsContext(reducers, {
getState: () => _.mergeWith({}, omitFunctionPropsDeep(this.state), omitFunctionPropsDeep(this.props), safeMerge),
setState: (state) => { this.setState(state); },
});
},
render() {
Iif (replaceEvents) {
return React.createElement(baseComponent, selector(this.boundContext.getPropReplaceReducers(this.props)), this.props.children);
}
return React.createElement(baseComponent, selector(this.boundContext.getProps(this.props)), this.props.children);
},
});
}
export function buildStatefulComponent(...args) {
logger.warnOnce('buildHybridComponent-once', 'Lucid: buildStatefulComponent has been renamed to buildHybridComponent.');
return buildHybridComponent(...args);
}
|