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This commit is contained in:
Julien Valverdé
2026-03-23 21:00:40 +01:00
parent 3f05a5099e
commit 11d23aa10c
1 changed files with 30 additions and 23 deletions
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53
packages/effect-fc/src/Lens.ts
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@@ -1,4 +1,4 @@
import { Effect, Pipeable, Predicate, Readable, Stream, Subscribable, type SubscriptionRef } from "effect"
import { Array, Effect, Pipeable, Predicate, Readable, Stream, Subscribable, SubscriptionRef } from "effect"
export const LensTypeId: unique symbol = Symbol.for("@effect-fc/Lens/Lens")
@@ -81,8 +81,8 @@ export const map = <A, ER, RR, EW, RW, B>(
},
},
): Lens<B, ER, RR, EW, RW> => make({
get: Effect.map(self.get, options.get),
changes: Stream.map(self.changes, options.get),
get get() { return Effect.map(self.get, options.get) },
get changes() { return Stream.map(self.changes, options.get) },
modify: <C, E1 = never, R1 = never>(
f: (b: B) => Effect.Effect<readonly [C, B], E1, R1>
) => self.modify(a =>
@@ -104,26 +104,24 @@ export const mapEffect = <A, ER, RR, EW, RW, B, EGet = never, RGet = never, ESet
(parent: A, b: B): Effect.Effect<A, ESet, RSet>
},
},
): Lens<B, ER | EGet, RR | RGet, EW | ESet, RW | RSet> => {
return make({
get: Effect.flatMap(self.get, options.get),
changes: Stream.mapEffect(self.changes, options.get),
modify: <C, E1 = never, R1 = never>(
f: (b: B) => Effect.Effect<readonly [C, B], E1, R1>
) => self.modify(a => Effect.flatMap(
options.get(a),
b => Effect.flatMap(
f(b),
([c, bNext]) => Effect.flatMap(
options.set.length >= 2
? (options.set as (parent: A, b: B) => Effect.Effect<A, ESet, RSet>)(a, bNext)
: (options.set as (b: B) => (parent: A) => Effect.Effect<A, ESet, RSet>)(bNext)(a),
nextA => Effect.succeed([c, nextA] as const),
),
)
)),
})
}
): Lens<B, ER | EGet, RR | RGet, EW | ESet, RW | RSet> => make({
get get() { return Effect.flatMap(self.get, options.get) },
get changes() { return Stream.mapEffect(self.changes, options.get) },
modify: <C, E1 = never, R1 = never>(
f: (b: B) => Effect.Effect<readonly [C, B], E1, R1>
) => self.modify(a => Effect.flatMap(
options.get(a),
b => Effect.flatMap(
f(b),
([c, bNext]) => Effect.flatMap(
options.set.length >= 2
? (options.set as (parent: A, b: B) => Effect.Effect<A, ESet, RSet>)(a, bNext)
: (options.set as (b: B) => (parent: A) => Effect.Effect<A, ESet, RSet>)(bNext)(a),
nextA => Effect.succeed([c, nextA] as const),
),
)
)),
})
export const unwrap = <A, ER, RR, EW, RW, E1, R1>(
effect: Effect.Effect<Lens<A, ER, RR, EW, RW>, E1, R1>
@@ -134,3 +132,12 @@ export const unwrap = <A, ER, RR, EW, RW, E1, R1>(
f: (a: A) => Effect.Effect<readonly [B, A], E2, R2>
) => Effect.flatMap(effect, l => l.modify(f)),
})
Effect.gen(function*() {
const myArrayRef = yield* SubscriptionRef.make([12, 38, 69])
const myArrayLens = fromSubscriptionRef(myArrayRef)
const valueLens = mapEffect(myArrayLens, { get: Array.get(1), set: (a, b) => Array.replace(a, 1, b) })
}).pipe(
Effect.runSync
)