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94 lines
2.7 KiB
Go
94 lines
2.7 KiB
Go
// Copyright (c) 2023 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 generic
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import (
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FCT "github.com/IBM/fp-go/function"
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"github.com/IBM/fp-go/internal/apply"
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C "github.com/IBM/fp-go/internal/chain"
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F "github.com/IBM/fp-go/internal/functor"
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M "github.com/IBM/fp-go/monoid"
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P "github.com/IBM/fp-go/pair"
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SG "github.com/IBM/fp-go/semigroup"
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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[GS ~func() P.Pair[S, W], W, S any](m M.Monoid[W], s S) GS {
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return Of[GS, W, S](m, s)
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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[GS1 ~func() P.Pair[S1, W], GS2 ~func() P.Pair[S2, W], GT ~func() P.Pair[A, W], W, S1, S2, A any](
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s SG.Semigroup[W],
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setter func(A) func(S1) S2,
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f func(S1) GT,
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) func(GS1) GS2 {
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return C.Bind(
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FCT.Bind1st(Chain[GS2, GS1, func(S1) GS2, W, S1, S2], s),
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Map[GS2, GT, func(A) S2, W, A, S2],
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setter,
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f,
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)
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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[GS1 ~func() P.Pair[S1, W], GS2 ~func() P.Pair[S2, W], W, S1, S2, A any](
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key func(A) func(S1) S2,
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f func(S1) A,
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) func(GS1) GS2 {
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return F.Let(
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Map[GS2, GS1, func(S1) S2, W, S1, S2],
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key,
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f,
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)
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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[GS1 ~func() P.Pair[S1, W], GS2 ~func() P.Pair[S2, W], W, S1, S2, B any](
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key func(B) func(S1) S2,
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b B,
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) func(GS1) GS2 {
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return F.LetTo(
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Map[GS2, GS1, func(S1) S2, W, S1, S2],
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key,
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b,
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)
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}
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// BindTo initializes a new state [S1] from a value [T]
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func BindTo[GS1 ~func() P.Pair[S1, W], GT ~func() P.Pair[A, W], W, S1, A any](
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setter func(A) S1,
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) func(GT) GS1 {
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return C.BindTo(
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Map[GS1, GT, func(A) S1, W, A, S1],
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setter,
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)
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}
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// ApS attaches a value to a context [S1] to produce a context [S2] by considering the context and the value concurrently
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func ApS[GS1 ~func() P.Pair[S1, W], GS2 ~func() P.Pair[S2, W], GT ~func() P.Pair[A, W], W, S1, S2, A any](
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s SG.Semigroup[W],
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setter func(A) func(S1) S2,
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fa GT,
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) func(GS1) GS2 {
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return apply.ApS(
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FCT.Bind1st(Ap[GS2, func() P.Pair[func(A) S2, W], GT, W, A, S2], s),
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Map[func() P.Pair[func(A) S2, W], GS1, func(S1) func(A) S2],
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setter,
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fa,
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)
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}
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