// Copyright (c) 2023 IBM Corp. // All rights reserved. // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. package fromeither import ( ET "github.com/IBM/fp-go/either" F "github.com/IBM/fp-go/function" C "github.com/IBM/fp-go/internal/chain" O "github.com/IBM/fp-go/option" ) func FromOption[A, HKTEA, E any](fromEither func(ET.Either[E, A]) HKTEA, onNone func() E) func(ma O.Option[A]) HKTEA { return F.Flow2(ET.FromOption[A](onNone), fromEither) } func FromPredicate[E, A, HKTEA any](fromEither func(ET.Either[E, A]) HKTEA, pred func(A) bool, onFalse func(A) E) func(A) HKTEA { return F.Flow2(ET.FromPredicate(pred, onFalse), fromEither) } func MonadFromOption[E, A, HKTEA any]( fromEither func(ET.Either[E, A]) HKTEA, onNone func() E, ma O.Option[A], ) HKTEA { return F.Pipe1( O.MonadFold( ma, F.Nullary2(onNone, ET.Left[A, E]), ET.Right[E, A], ), fromEither, ) } func FromOptionK[A, E, B, HKTEB any]( fromEither func(ET.Either[E, B]) HKTEB, onNone func() E) func(f func(A) O.Option[B]) func(A) HKTEB { // helper return F.Bind2nd(F.Flow2[func(A) O.Option[B], func(O.Option[B]) HKTEB, A, O.Option[B], HKTEB], FromOption(fromEither, onNone)) } func MonadChainEitherK[A, E, B, HKTEA, HKTEB any]( mchain func(HKTEA, func(A) HKTEB) HKTEB, fromEither func(ET.Either[E, B]) HKTEB, ma HKTEA, f func(A) ET.Either[E, B]) HKTEB { return mchain(ma, F.Flow2(f, fromEither)) } func ChainOptionK[A, E, B, HKTEA, HKTEB any]( mchain func(HKTEA, func(A) HKTEB) HKTEB, fromEither func(ET.Either[E, B]) HKTEB, onNone func() E, ) func(f func(A) O.Option[B]) func(ma HKTEA) HKTEB { return F.Flow2(FromOptionK[A](fromEither, onNone), F.Bind1st(F.Bind2nd[HKTEA, func(A) HKTEB, HKTEB], mchain)) } func MonadChainFirstEitherK[A, E, B, HKTEA, HKTEB any]( mchain func(HKTEA, func(A) HKTEA) HKTEA, mmap func(HKTEB, func(B) A) HKTEA, fromEither func(ET.Either[E, B]) HKTEB, ma HKTEA, f func(A) ET.Either[E, B]) HKTEA { return C.MonadChainFirst(mchain, mmap, ma, F.Flow2(f, fromEither)) } func ChainFirstEitherK[A, E, B, HKTEA, HKTEB any]( mchain func(HKTEA, func(A) HKTEA) HKTEA, mmap func(HKTEB, func(B) A) HKTEA, fromEither func(ET.Either[E, B]) HKTEB, f func(A) ET.Either[E, B]) func(HKTEA) HKTEA { return C.ChainFirst(mchain, mmap, F.Flow2(f, fromEither)) }