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This commit is contained in:
Julien Valverdé
2026-03-23 21:13:35 +01:00
parent 11d23aa10c
commit 88ad7cb1ac
1 changed files with 26 additions and 26 deletions
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52
packages/effect-fc/src/Lens.ts
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@@ -1,4 +1,4 @@
import { Array, Effect, Pipeable, Predicate, Readable, Stream, Subscribable, SubscriptionRef } from "effect"
import { Array, Chunk, Effect, flow, Option, Pipeable, Predicate, Readable, Stream, Subscribable, SubscriptionRef } from "effect"
export const LensTypeId: unique symbol = Symbol.for("@effect-fc/Lens/Lens")
@@ -73,50 +73,46 @@ export const fromSubscriptionRef = <A>(
export const map = <A, ER, RR, EW, RW, B>(
self: Lens<A, ER, RR, EW, RW>,
options: {
readonly get: (a: A) => B,
readonly set: {
(b: B): (parent: A) => A
(parent: A, b: B): A
},
get: (a: NoInfer<A>) => B,
set: {
(b: B): (parent: NoInfer<A>) => NoInfer<A>
(parent: NoInfer<A>, b: B): NoInfer<A>
},
): Lens<B, ER, RR, EW, RW> => make({
get get() { return Effect.map(self.get, options.get) },
get changes() { return Stream.map(self.changes, options.get) },
get get() { return Effect.map(self.get, get) },
get changes() { return Stream.map(self.changes, get) },
modify: <C, E1 = never, R1 = never>(
f: (b: B) => Effect.Effect<readonly [C, B], E1, R1>
) => self.modify(a =>
Effect.flatMap(f(options.get(a)), ([c, next]) => Effect.succeed([
Effect.flatMap(f(get(a)), ([c, next]) => Effect.succeed([
c,
options.set.length >= 2
? (options.set as (parent: A, b: B) => A)(a, next)
: (options.set as (b: B) => (parent: A) => A)(next)(a),
set.length >= 2
? (set as (parent: A, b: B) => A)(a, next)
: (set as (b: B) => (parent: A) => A)(next)(a),
]))
),
})
export const mapEffect = <A, ER, RR, EW, RW, B, EGet = never, RGet = never, ESet = never, RSet = never>(
self: Lens<A, ER, RR, EW, RW>,
options: {
readonly get: (a: A) => Effect.Effect<B, EGet, RGet>,
readonly set: {
(b: B): (parent: A) => Effect.Effect<A, ESet, RSet>
(parent: A, b: B): Effect.Effect<A, ESet, RSet>
},
get: (a: NoInfer<A>) => Effect.Effect<B, EGet, RGet>,
set: {
(b: B): (parent: NoInfer<A>) => Effect.Effect<NoInfer<A>, ESet, RSet>
(parent: NoInfer<A>, b: B): Effect.Effect<NoInfer<A>, ESet, RSet>
},
): 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) },
get get() { return Effect.flatMap(self.get, get) },
get changes() { return Stream.mapEffect(self.changes, 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),
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),
set.length >= 2
? (set as (parent: A, b: B) => Effect.Effect<A, ESet, RSet>)(a, bNext)
: (set as (b: B) => (parent: A) => Effect.Effect<A, ESet, RSet>)(bNext)(a),
nextA => Effect.succeed([c, nextA] as const),
),
)
@@ -137,7 +133,11 @@ export const unwrap = <A, ER, RR, EW, RW, E1, R1>(
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) })
const arrayValueLens = map(myArrayLens, flow(Array.get(1), Option.getOrThrow), (a, b) => Array.replace(a, 1, b))
const myChunkRef = yield* SubscriptionRef.make(Chunk.make([12, 38, 69]))
const myChunkLens = fromSubscriptionRef(myChunkRef)
const chunkValueLens = mapEffect(myChunkLens, Chunk.get(1), (a, b) => Effect.succeed(Chunk.replace(a, 1, b)))
}).pipe(
Effect.runSync
)