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7d3759619c
* fix: implement bind, let, apS for serveral monads Signed-off-by: Dr. Carsten Leue <carsten.leue@de.ibm.com> * fix: implement bind for maps Signed-off-by: Dr. Carsten Leue <carsten.leue@de.ibm.com> * fix: implement do notation for more monads Signed-off-by: Dr. Carsten Leue <carsten.leue@de.ibm.com> * fix: add bind to more monads Signed-off-by: Dr. Carsten Leue <carsten.leue@de.ibm.com> * fix: add Do and Bind support to Monads Signed-off-by: Dr. Carsten Leue <carsten.leue@de.ibm.com> --------- Signed-off-by: Dr. Carsten Leue <carsten.leue@de.ibm.com>
93 lines
2.7 KiB
Go
93 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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"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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O "github.com/IBM/fp-go/option"
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T "github.com/IBM/fp-go/tuple"
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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() O.Option[T.Tuple2[GS, S]], S any](
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empty S,
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) GS {
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return Of[GS](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[GS1 ~func() O.Option[T.Tuple2[GS1, S1]], GS2 ~func() O.Option[T.Tuple2[GS2, S2]], GA ~func() O.Option[T.Tuple2[GA, A]], S1, S2, A any](
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setter func(A) func(S1) S2,
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f func(S1) GA,
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) func(GS1) GS2 {
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return C.Bind(
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Chain[GS2, GS1, S1, S2],
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Map[GS2, GA, func(A) S2, 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() O.Option[T.Tuple2[GS1, S1]], GS2 ~func() O.Option[T.Tuple2[GS2, S2]], 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, 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() O.Option[T.Tuple2[GS1, S1]], GS2 ~func() O.Option[T.Tuple2[GS2, S2]], 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, 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() O.Option[T.Tuple2[GS1, S1]], GA ~func() O.Option[T.Tuple2[GA, A]], S1, A any](
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setter func(A) S1,
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) func(GA) GS1 {
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return C.BindTo(
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Map[GS1, GA, func(A) S1, 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[GAS2 ~func() O.Option[T.Tuple2[GAS2, func(A) S2]], GS1 ~func() O.Option[T.Tuple2[GS1, S1]], GS2 ~func() O.Option[T.Tuple2[GS2, S2]], GA ~func() O.Option[T.Tuple2[GA, A]], S1, S2, A any](
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setter func(A) func(S1) S2,
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fa GA,
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) func(GS1) GS2 {
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return apply.ApS(
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Ap[GAS2, GS2, GA, A, S2],
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Map[GAS2, GS1, func(S1) func(A) S2, 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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