mirror of
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108 lines
3.9 KiB
Go
108 lines
3.9 KiB
Go
// Copyright (c) 2023 - 2025 IBM Corp.
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// All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package readerioeither
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import (
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IOE "github.com/IBM/fp-go/v2/ioeither"
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G "github.com/IBM/fp-go/v2/readerioeither/generic"
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)
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// Bind creates an empty context of type [S] to be used with the [Bind] operation
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func Do[R, E, S any](
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empty S,
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) ReaderIOEither[R, E, S] {
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return G.Do[ReaderIOEither[R, E, S], IOE.IOEither[E, S], R, E, S](empty)
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}
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// Bind attaches the result of a computation to a context [S1] to produce a context [S2]
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func Bind[R, E, S1, S2, T any](
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setter func(T) func(S1) S2,
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f func(S1) ReaderIOEither[R, E, T],
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) Operator[R, E, S1, S2] {
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return G.Bind[ReaderIOEither[R, E, S1], ReaderIOEither[R, E, S2], ReaderIOEither[R, E, T], IOE.IOEither[E, S1], IOE.IOEither[E, S2], IOE.IOEither[E, T], R, E, S1, S2, T](setter, f)
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}
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// Let attaches the result of a computation to a context [S1] to produce a context [S2]
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func Let[R, E, S1, S2, T any](
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setter func(T) func(S1) S2,
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f func(S1) T,
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) Operator[R, E, S1, S2] {
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return G.Let[ReaderIOEither[R, E, S1], ReaderIOEither[R, E, S2], IOE.IOEither[E, S1], IOE.IOEither[E, S2], R, E, S1, S2, T](setter, f)
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}
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// LetTo attaches the a value to a context [S1] to produce a context [S2]
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func LetTo[R, E, S1, S2, T any](
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setter func(T) func(S1) S2,
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b T,
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) Operator[R, E, S1, S2] {
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return G.LetTo[ReaderIOEither[R, E, S1], ReaderIOEither[R, E, S2], IOE.IOEither[E, S1], IOE.IOEither[E, S2], R, E, S1, S2, T](setter, b)
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}
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// BindTo initializes a new state [S1] from a value [T]
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func BindTo[R, E, S1, T any](
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setter func(T) S1,
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) Operator[R, E, T, S1] {
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return G.BindTo[ReaderIOEither[R, E, S1], ReaderIOEither[R, E, T], IOE.IOEither[E, S1], IOE.IOEither[E, T], R, E, S1, T](setter)
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}
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// ApS attaches a value to a context [S1] to produce a context [S2] by considering
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// the context and the value concurrently (using Applicative rather than Monad).
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// This allows independent computations to be combined without one depending on the result of the other.
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//
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// Unlike Bind, which sequences operations, ApS can be used when operations are independent
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// and can conceptually run in parallel.
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//
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// Example:
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//
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// type State struct {
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// User User
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// Posts []Post
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// }
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// type Env struct {
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// UserRepo UserRepository
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// PostRepo PostRepository
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// }
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//
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// // These operations are independent and can be combined with ApS
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// getUser := readerioeither.Asks(func(env Env) ioeither.IOEither[error, User] {
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// return env.UserRepo.FindUser()
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// })
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// getPosts := readerioeither.Asks(func(env Env) ioeither.IOEither[error, []Post] {
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// return env.PostRepo.FindPosts()
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// })
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//
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// result := F.Pipe2(
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// readerioeither.Do[Env, error](State{}),
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// readerioeither.ApS(
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// func(user User) func(State) State {
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// return func(s State) State { s.User = user; return s }
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// },
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// getUser,
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// ),
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// readerioeither.ApS(
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// func(posts []Post) func(State) State {
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// return func(s State) State { s.Posts = posts; return s }
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// },
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// getPosts,
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// ),
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// )
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func ApS[R, E, S1, S2, T any](
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setter func(T) func(S1) S2,
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fa ReaderIOEither[R, E, T],
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) Operator[R, E, S1, S2] {
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return G.ApS[ReaderIOEither[R, E, func(T) S2], ReaderIOEither[R, E, S1], ReaderIOEither[R, E, S2], ReaderIOEither[R, E, T], IOE.IOEither[E, func(T) S2], IOE.IOEither[E, S1], IOE.IOEither[E, S2], IOE.IOEither[E, T], R, E, S1, S2, T](setter, fa)
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}
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