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82 lines
2.8 KiB
Go
82 lines
2.8 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 either
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import (
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F "github.com/IBM/fp-go/function"
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RR "github.com/IBM/fp-go/internal/record"
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)
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// TraverseRecordG transforms a record of options into an option of a record
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func TraverseRecordG[GA ~map[K]A, GB ~map[K]B, K comparable, E, A, B any](f func(A) Either[E, B]) func(GA) Either[E, GB] {
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return RR.Traverse[GA](
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Of[E, GB],
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Map[E, GB, func(B) GB],
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Ap[GB, E, B],
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f,
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)
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}
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// TraverseRecord transforms a record of eithers into an either of a record
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func TraverseRecord[K comparable, E, A, B any](f func(A) Either[E, B]) func(map[K]A) Either[E, map[K]B] {
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return TraverseRecordG[map[K]A, map[K]B](f)
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}
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// TraverseRecordWithIndexG transforms a record of options into an option of a record
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func TraverseRecordWithIndexG[GA ~map[K]A, GB ~map[K]B, K comparable, E, A, B any](f func(K, A) Either[E, B]) func(GA) Either[E, GB] {
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return RR.TraverseWithIndex[GA](
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Of[E, GB],
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Map[E, GB, func(B) GB],
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Ap[GB, E, B],
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f,
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)
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}
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// TraverseRecordWithIndex transforms a record of eithers into an either of a record
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func TraverseRecordWithIndex[K comparable, E, A, B any](f func(K, A) Either[E, B]) func(map[K]A) Either[E, map[K]B] {
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return TraverseRecordWithIndexG[map[K]A, map[K]B](f)
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}
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func SequenceRecordG[GA ~map[K]A, GOA ~map[K]Either[E, A], K comparable, E, A any](ma GOA) Either[E, GA] {
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return TraverseRecordG[GOA, GA](F.Identity[Either[E, A]])(ma)
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}
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// SequenceRecord converts a homogeneous sequence of either into an either of sequence
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func SequenceRecord[K comparable, E, A any](ma map[K]Either[E, A]) Either[E, map[K]A] {
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return SequenceRecordG[map[K]A](ma)
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}
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func upsertAtReadWrite[M ~map[K]V, K comparable, V any](r M, k K, v V) M {
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r[k] = v
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return r
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}
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// CompactRecordG discards the noe values and keeps the some values
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func CompactRecordG[M1 ~map[K]Either[E, A], M2 ~map[K]A, K comparable, E, A any](m M1) M2 {
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out := make(M2)
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onLeft := F.Constant1[E](out)
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return RR.ReduceWithIndex(m, func(key K, _ M2, value Either[E, A]) M2 {
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return MonadFold(value, onLeft, func(v A) M2 {
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return upsertAtReadWrite(out, key, v)
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})
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}, out)
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}
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// CompactRecord discards all none values and keeps the somes
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func CompactRecord[K comparable, E, A any](m map[K]Either[E, A]) map[K]A {
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return CompactRecordG[map[K]Either[E, A], map[K]A](m)
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}
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