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November 25, 2020 19:58
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| function canTraverse (graph, start, end) { | |
| return Boolean(graph[start]?.[end]); | |
| } | |
| const questionsMachine = Machine({ | |
| id: "questions", | |
| parallel: true, | |
| context: { | |
| routes: { | |
| home: { | |
| feed: true | |
| }, | |
| }, | |
| // history stack with initial route of one | |
| stack: ["home"] | |
| }, | |
| states: { | |
| app: { | |
| initial: "home", | |
| states: { | |
| home: {}, | |
| feed: {} | |
| } | |
| }, | |
| router: { | |
| on: { | |
| ROUTER_SEND_TO: { | |
| actions: assign((ctx, e) => { | |
| const {stack} = ctx; | |
| if(!e.route || !canTraverse(ctx.routes, ctx.stack[ctx.stack.length - 1], e.route)) { | |
| return { | |
| stack | |
| } | |
| } | |
| return { | |
| stack: stack.concat(e.route) | |
| } | |
| }) | |
| }, | |
| ROUTER_BACK: { | |
| actions: assign(ctx => { | |
| const { stack } = ctx; | |
| const newStack = stack.slice(0, stack.length - 1); | |
| const prev = stack[stack.length - 1]; | |
| if(newStack.length === 0) { | |
| return { | |
| stack | |
| } | |
| } | |
| return { | |
| stack: newStack | |
| }; | |
| }), | |
| cond: ctx => ctx.stack.length > 1 | |
| }, | |
| // ... | |
| } | |
| }, | |
| // ... | |
| } | |
| }); |
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