packages/effect-fc/src/types/Form.ts

@@ -1,4 +1,4 @@
-import { Effectable, Option, Schema, Subscribable, SubscriptionRef, type ParseResult, type Pipeable } from "effect"
+import { Effect, Option, Pipeable, Schema, Subscribable, SubscriptionRef, type ParseResult } from "effect"
 import type * as PropertyPath from "./PropertyPath.js"
 
 
@@ -11,13 +11,31 @@ extends Pipeable.Pipeable {
     readonly valueRef: SubscriptionRef.SubscriptionRef<A>
     readonly errorSubscribable: Subscribable.Subscribable<Option.Option<ParseResult.ParseError>>
 
-    useRef<P extends PropertyPath.Paths<A>>(path: P): SubscriptionRef.SubscriptionRef<PropertyPath.ValueFromPath<A, P>>
-    useIssues(path: PropertyPath.Paths<A>): readonly ParseResult.ParseIssue[]
+    useRef<P extends PropertyPath.Paths<A>>(path: P): Effect.Effect<SubscriptionRef.SubscriptionRef<PropertyPath.ValueFromPath<A, P>>>
+    useIssues(path: PropertyPath.Paths<A>): Effect.Effect<readonly ParseResult.ParseIssue[]>
 }
 
 class FormImpl<in out A, in out I, out R>
-extends Effectable.Class<> implements Form<A, I, R> {
+extends Pipeable.Class() implements Form<A, I, R> {
     readonly [TypeId]: TypeId = TypeId
+
+    constructor(
+        readonly schema: Schema.Schema<A, I, R>,
+        readonly valueRef: SubscriptionRef.SubscriptionRef<A>,
+        readonly errorSubscribable: Subscribable.Subscribable<Option.Option<ParseResult.ParseError>>
+    ) {
+        super()
+    }
+
+    useRef<P extends PropertyPath.Paths<A>>(
+        path: P
+    ): Effect.Effect<SubscriptionRef.SubscriptionRef<PropertyPath.ValueFromPath<A, P>>, never, never> {
+        throw new Error("Method not implemented.")
+    }
+
+    useIssues(path: PropertyPath.Paths<A>): Effect.Effect<readonly ParseResult.ParseIssue[]> {
+        throw new Error("Method not implemented.")
+    }
 }
 
 

packages/effect-fc/src/types/Schema.ts

@@ -0,0 +1,118 @@
+import { Array, Function, Option, Predicate, Schema } from "effect"
+
+
+type Prev = readonly [never, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
+
+export type Paths<S, D extends number = 5, Seen = never> = readonly [] | (
+    D extends never ? readonly [] :
+    S extends Seen ? readonly [] :
+    S extends Schema.Union<infer Members> ? UnionPaths<Members, D, Seen | S> :
+    S extends Schema.TupleType<infer Elements, infer Rest> ? FormField.TupleFormField<S, Elements, Rest> :
+    S extends Schema.Array$<infer Value> ? FormField.ArrayFormField<S, Value> :
+    S extends Schema.Struct<infer Fields> ? FormField.StructFormField<S, Fields> :
+    S extends Schema.Schema.Any ? FormField.GenericFormField<S> :
+    S extends Schema.PropertySignature<
+        infer TypeToken,
+        infer Type,
+        infer Key,
+        infer EncodedToken,
+        infer Encoded,
+        infer HasDefault,
+        infer R
+    > ? FormField.PropertySignatureFormField<S, TypeToken, Type, Key, EncodedToken, Encoded, HasDefault, R> :
+    never
+)
+
+export type UnionPaths<Members extends ReadonlyArray<Schema.Schema.All>, D extends number, Seen> = {
+    [K in keyof T as K extends number ? K : never]:
+        | readonly [K]
+        | readonly [K, ...Paths<T[K], Prev[D], Seen>]
+} extends infer O
+    ? O[keyof O]
+    : never
+
+export type ArrayPaths<T extends readonly any[], D extends number, Seen> = {
+    [K in keyof T as K extends number ? K : never]:
+        | readonly [K]
+        | readonly [K, ...Paths<T[K], Prev[D], Seen>]
+} extends infer O
+    ? O[keyof O]
+    : never
+
+export type ObjectPaths<T extends object, D extends number, Seen> = {
+    [K in keyof T as K extends string | number | symbol ? K : never]-?:
+        NonNullable<T[K]> extends infer V
+            ? readonly [K] | readonly [K, ...Paths<V, Prev[D], Seen>]
+            : never
+} extends infer O
+    ? O[keyof O]
+    : never
+
+export type ValueFromPath<T, P extends readonly any[]> = P extends [infer Head, ...infer Tail]
+    ? Head extends keyof T
+        ? ValueFromPath<T[Head], Tail>
+        : T extends readonly any[]
+            ? Head extends number
+                ? ValueFromPath<T[number], Tail>
+                : never
+            : never
+    : T
+
+export type AnyPath = readonly PropertyKey[]
+
+
+export const unsafeGet: {
+    <T, const P extends Paths<T>>(path: P): (self: T) => ValueFromPath<T, P>
+    <T, const P extends Paths<T>>(self: T, path: P): ValueFromPath<T, P>
+} = Function.dual(2, <T, const P extends Paths<T>>(self: T, path: P): ValueFromPath<T, P> =>
+    path.reduce((acc: any, key: any) => acc?.[key], self)
+)
+
+export const get: {
+    <T, const P extends Paths<T>>(path: P): (self: T) => Option.Option<ValueFromPath<T, P>>
+    <T, const P extends Paths<T>>(self: T, path: P): Option.Option<ValueFromPath<T, P>>
+} = Function.dual(2, <T, const P extends Paths<T>>(self: T, path: P): Option.Option<ValueFromPath<T, P>> =>
+    path.reduce(
+        (acc: Option.Option<any>, key: any): Option.Option<any> => Option.isSome(acc)
+            ? Predicate.hasProperty(acc.value, key)
+                ? Option.some(acc.value[key])
+                : Option.none()
+            : acc,
+
+        Option.some(self),
+    )
+)
+
+export const immutableSet: {
+    <T, const P extends Paths<T>>(path: P, value: ValueFromPath<T, P>): (self: T) => ValueFromPath<T, P>
+    <T, const P extends Paths<T>>(self: T, path: P, value: ValueFromPath<T, P>): Option.Option<T>
+} = Function.dual(3, <T, const P extends Paths<T>>(self: T, path: P, value: ValueFromPath<T, P>): Option.Option<T> => {
+    const key = Array.head(path as AnyPath)
+    if (Option.isNone(key))
+        return Option.some(value as T)
+    if (!Predicate.hasProperty(self, key.value))
+        return Option.none()
+
+    const child = immutableSet<any, any>(self[key.value], Option.getOrThrow(Array.tail(path as AnyPath)), value)
+    if (Option.isNone(child))
+        return child
+
+    if (Array.isArray(self))
+        return typeof key.value === "number"
+            ? Option.some([
+                ...self.slice(0, key.value),
+                child.value,
+                ...self.slice(key.value + 1),
+            ] as T)
+            : Option.none()
+
+    if (typeof self === "object")
+        return Option.some(
+            Object.assign(
+                Object.create(Object.getPrototypeOf(self)),
+                { ...self, [key.value]: child.value },
+            )
+        )
+
+    return Option.none()
+})