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| import React, { isValidElement } from 'react';
import _ from 'lodash';
import { logger } from './logger';
import { createSelector } from 'reselect';
import createClass from 'create-react-class';
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 = []
) {
const localPath = _.take(path, _.size(path) - 1);
return _.assign(
function(...args) {
if (_.isEmpty(localPath)) {
setState(reducerFunction(getState(), ...args));
} else {
const 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.
*
* This function is memoized because it's recursive, and we want it to reuse
* the functions created in the recursive reduce because those functions are
* also memoized (reselect selectors are memoized with a cache of 1) and we want
* to maintain their caches.
*/
export const reduceSelectors = _.memoize(selectors => {
Iif (!_.isPlainObject(selectors)) {
throw new Error(
'Selectors must be a plain object with function or plain object values'
);
}
/**
* For each iteration of `reduceSelectors`, we return a memoized selector so
* that individual branches maintain reference equality if they haven't been
* modified, even if a sibling (and therefore the parent) has been modified.
*/
return createSelector(_.identity, state =>
_.reduce(
selectors,
(acc, selector, key) => ({
...acc,
[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 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() {
let synchronousState = this.state; //store reference to state, use in place of `this.state` in `getState`
this.boundContext = getStatefulPropsContext(reducers, {
getState: () =>
_.mergeWith(
{},
omitFunctionPropsDeep(synchronousState),
omitFunctionPropsDeep(this.props),
safeMerge
),
setState: state => {
synchronousState = state; //synchronously update the state reference
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);
}
|