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43 lines
1.3 KiB
Go
43 lines
1.3 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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OPT "github.com/IBM/fp-go/optics/optional"
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P "github.com/IBM/fp-go/optics/prism"
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O "github.com/IBM/fp-go/option"
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)
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// PrismAsOptional converts a prism into an optional
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func PrismAsOptional[S, A any](sa P.Prism[S, A]) OPT.Optional[S, A] {
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return OPT.MakeOptional(
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sa.GetOption,
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func(s S, a A) S {
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return P.Set[S](a)(sa)(s)
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},
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)
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}
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func PrismSome[A any]() P.Prism[O.Option[A], A] {
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return P.MakePrism(F.Identity[O.Option[A]], O.Some[A])
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}
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// Some returns a `Optional` from a `Optional` focused on the `Some` of a `Option` type.
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func Some[S, A any](soa OPT.Optional[S, O.Option[A]]) OPT.Optional[S, A] {
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return OPT.Compose[S](PrismAsOptional(PrismSome[A]()))(soa)
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}
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