25 lines
1.2 KiB
JavaScript
25 lines
1.2 KiB
JavaScript
import { todo } from './todo.js'
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/**
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* The single impure place in the course (with browser.js and main.js): everything else only builds values.
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* A Platform is `{ fillRect(x,y,w,h,color), fillText(x,y,text,color,size,align), randomSeed() -> number,
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* startClock(onTime: t => void), onKeyDown(cb: key => void), onKeyUp(cb: key => void) }`.
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* Here `let`, loops and mutation are allowed. Keep it tiny.
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*/
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/**
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* Interpret an IO against a platform and return its final value.
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* `Draw` of a Rect -> `platform.fillRect(x, y, w, h, color)`; of a Text -> `platform.fillText(x, y, text, color, size, align)`;
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* `RandomSeed` -> `platform.randomSeed()`. The result of each op is passed to `io.k`.
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* Must be a loop, not recursion: a long sequence of draws must not overflow the stack.
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*/
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export const runIO = (io, platform) => todo('m09')
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/**
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* Run the program: `runIO(main)` gives the stream; keep the current stream in the one mutable variable.
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* Register `platform.onKeyDown` / `onKeyUp` / `startClock` so that each event steps the stream with the matching
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* input (`{tag:'KeyDown', key}`, `{tag:'KeyUp', key}`, `{tag:'Time', t}`), stores the next stream,
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* and runs every IO the step emitted, in order.
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*/
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export const runApp = (main, platform) => todo('m09')
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