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https://github.com/IBM/fp-go.git
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124 lines
2.1 KiB
Go
124 lines
2.1 KiB
Go
// Copyright (c) 2024 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 state
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import (
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F "github.com/IBM/fp-go/function"
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P "github.com/IBM/fp-go/pair"
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)
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func Of[
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HKTSA ~func(S) HKTA,
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HKTA,
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S, A any,
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](
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fof func(P.Pair[A, S]) HKTA,
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a A) HKTSA {
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return F.Flow2(
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F.Bind1st(P.MakePair[A, S], a),
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fof,
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)
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}
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func MonadMap[
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HKTSA ~func(S) HKTA,
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HKTSB ~func(S) HKTB,
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HKTA,
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HKTB,
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S, A, B any,
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](
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fmap func(HKTA, func(P.Pair[A, S]) P.Pair[B, S]) HKTB,
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fa HKTSA,
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f func(A) B,
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) HKTSB {
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return F.Flow2(
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fa,
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F.Bind2nd(fmap, func(a P.Pair[A, S]) P.Pair[B, S] {
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return P.MakePair(f(P.Head(a)), P.Tail(a))
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}),
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)
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}
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func Map[
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HKTSA ~func(S) HKTA,
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HKTSB ~func(S) HKTB,
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HKTA,
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HKTB,
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S, A, B any,
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](
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fmap func(func(P.Pair[A, S]) P.Pair[B, S]) func(HKTA) HKTB,
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f func(A) B,
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) func(HKTSA) HKTSB {
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mp := fmap(func(a P.Pair[A, S]) P.Pair[B, S] {
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return P.MakePair(f(P.Head(a)), P.Tail(a))
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})
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return func(fa HKTSA) HKTSB {
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return F.Flow2(
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fa,
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mp,
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)
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}
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}
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func MonadChain[
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HKTSA ~func(S) HKTA,
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HKTSB ~func(S) HKTB,
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HKTA,
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HKTB,
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S, A any,
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](
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fchain func(HKTA, func(P.Pair[A, S]) HKTB) HKTB,
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fa HKTSA,
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f func(A) HKTSB,
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) HKTSB {
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return F.Flow2(
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fa,
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F.Bind2nd(fchain, func(a P.Pair[A, S]) HKTB {
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return f(P.Head(a))(P.Tail(a))
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}),
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)
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}
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func Chain[
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HKTSA ~func(S) HKTA,
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HKTSB ~func(S) HKTB,
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HKTA,
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HKTB,
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S, A any,
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](
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fchain func(func(P.Pair[A, S]) HKTB) func(HKTA) HKTB,
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f func(A) HKTSB,
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) func(HKTSA) HKTSB {
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mp := fchain(func(a P.Pair[A, S]) HKTB {
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return f(P.Head(a))(P.Tail(a))
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})
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return func(fa HKTSA) HKTSB {
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return F.Flow2(
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fa,
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mp,
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)
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}
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}
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