lexer-state

Version:
Lightweight state machine library to define and manage state transition declaratively
60 lines • 2.31 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.useLexerStates = exports.LexerStateProviders = exports.useLexerStateBase = void 0;
const jsx_runtime_1 = require("react/jsx-runtime");
const react_1 = require("react");
const util_1 = require("../util");
const useLexerStateBase = (machine) => {
    const [currentState, setCurrentState] = (0, react_1.useState)(machine.currentState);
    return {
        currentState,
        dispatchEvent(e) {
            setCurrentState(machine.next(e));
        },
    };
};
exports.useLexerStateBase = useLexerStateBase;
const createLexerStateContext = () => (0, react_1.createContext)([
    { currentState: null },
    () => null,
]);
const createContextFactory = () => {
    const map = new Map();
    return {
        create(machines) {
            for (const machine of machines) {
                map.set(machine, createLexerStateContext());
            }
            return this;
        },
        get(mahine) {
            return map.get(mahine);
        },
    };
};
const contextFactory = createContextFactory();
const SingleMahineProvider = ({ LexerStateContext, machine, children, }) => {
    const { currentState, dispatchEvent } = (0, exports.useLexerStateBase)(machine);
    return ((0, jsx_runtime_1.jsx)(LexerStateContext.Provider, { value: [currentState, dispatchEvent], children: children }));
};
const LexerStateProviders = ({ children, machines, }) => {
    const factory = (0, react_1.useMemo)(() => {
        return contextFactory.create(machines);
    }, [machines]);
    const providers = machines.map((machine) => {
        const machineContext = factory.get(machine);
        return ((0, jsx_runtime_1.jsx)(SingleMahineProvider, { LexerStateContext: machineContext, machine: machine }));
    }, null);
    const ContextProvider = (0, util_1.compose)(providers);
    return (0, jsx_runtime_1.jsx)(ContextProvider, { children: children });
};
exports.LexerStateProviders = LexerStateProviders;
const useLexerStates = (machine) => {
    const [currentState, dispatchEvent] = (0, react_1.useContext)(contextFactory.get(machine));
    return {
        currentState: currentState,
        dispatchEvent: dispatchEvent,
    };
};
exports.useLexerStates = useLexerStates;
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