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https://github.com/IBM/fp-go.git
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88 lines
2.8 KiB
Go
88 lines
2.8 KiB
Go
// Copyright (c) 2023 - 2025 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 fromoption
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import (
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F "github.com/IBM/fp-go/v2/function"
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O "github.com/IBM/fp-go/v2/option"
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)
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func FromPredicate[A, HKTEA any](fromOption func(Option[A]) HKTEA, pred func(A) bool) func(A) HKTEA {
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return F.Flow2(O.FromPredicate(pred), fromOption)
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}
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// func MonadFromOption[E, A, HKTEA any](
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// fromEither func(ET.Either[E, A]) HKTEA,
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// onNone func() E,
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// ma O.Option[A],
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// ) HKTEA {
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// return F.Pipe1(
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// O.MonadFold(
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// ma,
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// F.Nullary2(onNone, ET.Left[A, E]),
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// ET.Right[E, A],
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// ),
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// fromEither,
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// )
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// }
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// func FromOptionK[A, E, B, HKTEB any](
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// fromEither func(ET.Either[E, B]) HKTEB,
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// onNone func() E) func(f func(A) O.Option[B]) func(A) HKTEB {
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// // helper
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// return F.Bind2nd(F.Flow2[func(A) O.Option[B], func(O.Option[B]) HKTEB, A, O.Option[B], HKTEB], FromOption(fromEither, onNone))
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// }
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func MonadChainOptionK[A, B, HKTEA, HKTEB any](
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mchain func(HKTEA, func(A) HKTEB) HKTEB,
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fromOption func(Option[B]) HKTEB,
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ma HKTEA,
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f func(A) Option[B]) HKTEB {
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return mchain(ma, F.Flow2(f, fromOption))
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}
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func ChainOptionK[A, B, HKTEA, HKTEB any](
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mchain func(func(A) HKTEB) func(HKTEA) HKTEB,
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fromOption func(Option[B]) HKTEB,
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f func(A) Option[B]) func(HKTEA) HKTEB {
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return mchain(F.Flow2(f, fromOption))
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}
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// func ChainOptionK[A, E, B, HKTEA, HKTEB any](
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// mchain func(HKTEA, func(A) HKTEB) HKTEB,
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// fromEither func(ET.Either[E, B]) HKTEB,
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// onNone func() E,
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// ) func(f func(A) O.Option[B]) func(ma HKTEA) HKTEB {
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// return F.Flow2(FromOptionK[A](fromEither, onNone), F.Bind1st(F.Bind2nd[HKTEA, func(A) HKTEB, HKTEB], mchain))
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// }
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// func MonadChainFirstEitherK[A, E, B, HKTEA, HKTEB any](
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// mchain func(HKTEA, func(A) HKTEA) HKTEA,
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// mmap func(HKTEB, func(B) A) HKTEA,
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// fromEither func(ET.Either[E, B]) HKTEB,
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// ma HKTEA,
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// f func(A) ET.Either[E, B]) HKTEA {
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// return C.MonadChainFirst(mchain, mmap, ma, F.Flow2(f, fromEither))
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// }
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// func ChainFirstEitherK[A, E, B, HKTEA, HKTEB any](
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// mchain func(func(A) HKTEA) func(HKTEA) HKTEA,
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// mmap func(func(B) A) func(HKTEB) HKTEA,
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// fromEither func(ET.Either[E, B]) HKTEB,
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// f func(A) ET.Either[E, B]) func(HKTEA) HKTEA {
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// return C.ChainFirst(mchain, mmap, F.Flow2(f, fromEither))
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// }
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