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fp-go/option/record.go

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// 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 option
import (
F "github.com/IBM/fp-go/function"
RR "github.com/IBM/fp-go/internal/record"
)
// TraverseRecordG transforms a record of options into an option of a record
func TraverseRecordG[GA ~map[K]A, GB ~map[K]B, K comparable, A, B any](f func(A) Option[B]) func(GA) Option[GB] {
return RR.Traverse[GA](
Of[GB],
Map[GB, func(B) GB],
Ap[GB, B],
f,
)
}
// TraverseRecord transforms a record of options into an option of a record
func TraverseRecord[K comparable, A, B any](f func(A) Option[B]) func(map[K]A) Option[map[K]B] {
return TraverseRecordG[map[K]A, map[K]B](f)
}
// TraverseRecordWithIndexG transforms a record of options into an option of a record
func TraverseRecordWithIndexG[GA ~map[K]A, GB ~map[K]B, K comparable, A, B any](f func(K, A) Option[B]) func(GA) Option[GB] {
return RR.TraverseWithIndex[GA](
Of[GB],
Map[GB, func(B) GB],
Ap[GB, B],
f,
)
}
// TraverseRecordWithIndex transforms a record of options into an option of a record
func TraverseRecordWithIndex[K comparable, A, B any](f func(K, A) Option[B]) func(map[K]A) Option[map[K]B] {
return TraverseRecordWithIndexG[map[K]A, map[K]B](f)
}
func SequenceRecordG[GA ~map[K]A, GOA ~map[K]Option[A], K comparable, A any](ma GOA) Option[GA] {
return TraverseRecordG[GOA, GA](F.Identity[Option[A]])(ma)
}
// SequenceRecord converts a homogeneous sequence of either into an either of sequence
func SequenceRecord[K comparable, A any](ma map[K]Option[A]) Option[map[K]A] {
return SequenceRecordG[map[K]A](ma)
}
func upsertAtReadWrite[M ~map[K]V, K comparable, V any](r M, k K, v V) M {
r[k] = v
return r
}
// CompactRecordG discards the noe values and keeps the some values
func CompactRecordG[M1 ~map[K]Option[A], M2 ~map[K]A, K comparable, A any](m M1) M2 {
bnd := F.Bind12of3(upsertAtReadWrite[M2])
return RR.ReduceWithIndex(m, func(key K, m M2, value Option[A]) M2 {
return MonadFold(value, F.Constant(m), bnd(m, key))
}, make(M2))
}
// CompactRecord discards the noe values and keeps the some values
func CompactRecord[K comparable, A any](m map[K]Option[A]) map[K]A {
return CompactRecordG[map[K]Option[A], map[K]A](m)
}