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decaylala/machine.js

Created December 15, 2020 15:15
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  1. decaylala revised this gist Dec 15, 2020. No changes.
  2. decaylala created this gist Dec 15, 2020.
    78 changes: 78 additions & 0 deletions machine.js
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,78 @@

    // Available variables:
    // - Machine
    // - interpret
    // - assign
    // - send
    // - sendParent
    // - spawn
    // - raise
    // - actions
    // - XState (all XState exports)

    const FULL_STOCK = 5;

    const machine = Machine({
    initial: 'normal',
    context: {
    supply: 5
    },
    states: {
    normal: {
    on: {
    "": [
    {
    target: 'empty',
    cond: 'isEmpty',
    },
    {
    target: 'full',
    cond: 'isFull'
    },
    ],
    DISPENSE: {
    target: 'normal',
    actions: 'dispense'
    },
    RESTOCK: {
    target: 'normal',
    actions: 'restock',
    }
    },
    },
    full: {
    on: {
    DISPENSE: {
    target: 'normal',
    actions: 'dispense'
    },
    }
    },
    empty: {
    on: {
    RESTOCK: {
    target: 'normal',
    actions: 'restock'
    }
    }
    }
    }
    }, {
    actions: {
    dispense: assign({
    supply: (context, event) => context.supply - 1
    }),
    restock: assign({
    supply: (context, event) => FULL_STOCK
    })
    },
    guards: {
    isEmpty: (context, event) => {
    return context.supply === 0;
    },
    isFull: (context, event) => {
    return context.supply === FULL_STOCK;
    }
    }
    });