@chickendinosaur/storex/lib/store.js

Front-end state management system.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
class Store {
    constructor(reducers, initialState) {
        this.state = initialState || {};
        this.reducers = null;
        this.subscribers = null;
        // Apply reducers.
        if (reducers !== undefined) {
            this.addReducers(reducers);
        }
    }
    dispatchAction(action) {
        if (this.reducers !== null) {
            let i = this.reducers.length;
            while (--i >= 0) {
                const reducer = this.reducers[i];
                const actionCallback = reducer.actionMap[action.type];
                if (actionCallback !== undefined) {
                    this.state[reducer.id] = actionCallback(this.state[reducer.id], action);
                }
            }
            this.update();
        }
        return action;
    }
    update() {
        if (this.subscribers !== null) {
            let i = this.subscribers.length;
            while (--i >= 0) {
                this.subscribers[i](this.state);
            }
        }
    }
    getState() {
        return this.state;
    }
    setState(value) {
        this.state = value;
        this.update();
    }
    addSubscriber(subscriber) {
        if (this.subscribers === null) {
            this.subscribers = [];
        }
        this.subscribers.push(subscriber);
    }
    removeSubscriber(subscriber) {
        if (this.subscribers !== null) {
            if (this.subscribers.length === 1) {
                this.subscribers = null;
            }
            else {
                this.subscribers.splice(this.subscribers.indexOf(subscriber), 1);
            }
        }
    }
    addReducers(reducers) {
        const reducersLen = reducers.length;
        let i = 0;
        let reducer;
        for (; i < reducersLen; ++i) {
            reducer = reducers[i];
            if (this.state[reducer.id] === undefined) {
                // Generate initial state for the given state key only if it has not been set.
                this.state[reducer.id] = reducer.getDefaultState();
            }
            if (this.reducers === null) {
                this.reducers = reducers;
            }
            else if (this.reducers.indexOf(reducer) === -1) {
                // Prevent duplicate reducers.
                this.reducers.push(reducer);
            }
        }
    }
    removeReducers(reducers) {
        if (this.reducers !== null) {
            let i = reducers.length;
            while (--i >= 0) {
                this.reducers.splice(this.reducers.indexOf(reducers[i]), 1);
            }
        }
    }
}
exports.default = Store;