32 lines
916 B
TypeScript
32 lines
916 B
TypeScript
import {isPointer, valueDerivation} from '../Atom'
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import type {Pointer} from '../pointer'
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import type {IDerivation} from './IDerivation'
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import {isDerivation} from './IDerivation'
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export default function* iterateAndCountTicks<V>(
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pointerOrDerivation: IDerivation<V> | Pointer<V>,
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): Generator<{value: V; ticks: number}, void, void> {
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let d
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if (isPointer(pointerOrDerivation)) {
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d = valueDerivation(pointerOrDerivation) as IDerivation<V>
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} else if (isDerivation(pointerOrDerivation)) {
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d = pointerOrDerivation
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} else {
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throw new Error(`Only pointers and derivations are supported`)
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}
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let ticksCountedSinceLastYield = 0
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const untap = d.changes().tap(() => {
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ticksCountedSinceLastYield++
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})
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try {
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while (true) {
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const ticks = ticksCountedSinceLastYield
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ticksCountedSinceLastYield = 0
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yield {value: d.getValue(), ticks}
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}
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} finally {
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untap()
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}
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}
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