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Generated by XState Viz: https://xstate.js.org/viz
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// Available variables: | |
// - Machine | |
// - interpret | |
// - assign | |
// - send | |
// - sendParent | |
// - spawn | |
// - raise | |
// - actions | |
// - XState (all XState exports) | |
const decreaseMoves = assign({ | |
movesLeft: (context) => context.movesLeft - 1 | |
}); | |
const assignUp = assign({ | |
x: (context) => context.x - 1, | |
}); | |
const assignDown = assign({ | |
x: (context) => context.x + 1 | |
}); | |
const assignLeft = assign({ | |
y: (context) => context.y - 1 | |
}); | |
const assignRight = assign({ | |
y: (context) => context.y + 1 | |
}); | |
const won = ({x, y, finish}) => ( finish[0] === x && finish[1] === y) | |
const loose = ({ movesLeft }) => movesLeft === 0; | |
const isWalkable = ({ cells }) => (x, y) => (cells[x][y]?.walkable) | |
const canMoveUp = (context) => context.x > 0 && isWalkable(context)(context.x - 1, context.y); | |
const canMoveDown = (context) => context.x < context.maxX - 1 && isWalkable(context)(context.x + 1, context.y); | |
const canMoveLeft = (context) => context.y > 0 && isWalkable(context)(context.x, context.y - 1); | |
const canMoveRight = (context) => context.y < context.maxY - 1 && isWalkable(context)(context.x, context.y + 1); | |
const fetchMachine = Machine({ | |
initial: "idle", | |
context: { | |
movesLeft: 10, | |
x: 0, | |
y: 0, | |
start: [0, 0], | |
finish: [2,0], | |
maxX: 3, | |
maxY: 3, | |
}, | |
states: { | |
idle: { | |
on: { | |
MOVE_UP: { cond: canMoveUp, actions: assignUp, target: "moving" }, | |
MOVE_DOWN: { cond: canMoveDown, actions: assignDown, target: "moving" }, | |
MOVE_LEFT: { cond: canMoveLeft, actions: assignLeft, target: "moving" }, | |
MOVE_RIGHT: { cond: canMoveRight, actions: assignRight, target: "moving" }, | |
} | |
}, | |
moving: { | |
entry: decreaseMoves, | |
on: { | |
'': [ | |
{ target: 'win', cond: won }, | |
{ target: 'loss', cond: loose }, | |
{ target: 'idle' } | |
] | |
} | |
}, | |
win: { | |
type: "final" | |
}, | |
loss: { | |
type: "final" | |
} | |
} | |
}); |
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