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54 lines
1.4 KiB
Go
54 lines
1.4 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 generic
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import (
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R "reflect"
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F "github.com/IBM/fp-go/function"
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LG "github.com/IBM/fp-go/io/generic"
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L "github.com/IBM/fp-go/lazy"
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N "github.com/IBM/fp-go/number"
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I "github.com/IBM/fp-go/number/integer"
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O "github.com/IBM/fp-go/option"
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P "github.com/IBM/fp-go/pair"
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)
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func FromReflect[GR ~func() O.Option[P.Pair[GR, R.Value]]](val R.Value) GR {
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// recursive callback
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var recurse func(idx int) GR
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// limits the index
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fromPred := O.FromPredicate(I.Between(0, val.Len()))
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recurse = func(idx int) GR {
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return F.Pipe3(
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idx,
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L.Of[int],
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L.Map(fromPred),
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LG.Map[L.Lazy[O.Option[int]], GR](O.Map(
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F.Flow2(
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P.Of[int],
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P.BiMap(F.Flow2(N.Add(1), recurse), val.Index),
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),
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)),
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)
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}
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// start the recursion
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return recurse(0)
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}
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