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47 lines
1.2 KiB
Go
47 lines
1.2 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 prism
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import (
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F "github.com/IBM/fp-go/function"
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O "github.com/IBM/fp-go/option"
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)
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// AsTraversal converts a prism to a traversal
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func AsTraversal[R ~func(func(A) HKTA) func(S) HKTS, S, A, HKTS, HKTA any](
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fof func(S) HKTS,
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fmap func(HKTA, func(A) S) HKTS,
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) func(Prism[S, A]) R {
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return func(sa Prism[S, A]) R {
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return func(f func(a A) HKTA) func(S) HKTS {
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return func(s S) HKTS {
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return F.Pipe2(
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s,
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sa.GetOption,
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O.Fold(
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F.Nullary2(F.Constant(s), fof),
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func(a A) HKTS {
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return fmap(f(a), func(a A) S {
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return prismModify(F.Constant1[A](a), sa, s)
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})
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},
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),
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)
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}
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}
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}
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}
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