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97 lines
4.1 KiB
Go
97 lines
4.1 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 generic
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import (
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"github.com/IBM/fp-go/v2/internal/apply"
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T "github.com/IBM/fp-go/v2/tuple"
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)
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// SequenceT converts n inputs of higher kinded types into a higher kinded type of n strongly typed values,
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// represented as a tuple. This generic version works with custom reader types that match the pattern ~func(R) A.
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//
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// This is useful for combining multiple independent generic Reader computations into a single
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// generic Reader that produces a tuple of all results.
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// SequenceT1 combines 1 generic Reader into a generic Reader of a 1-tuple.
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//
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// Type Parameters:
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// - GA: The generic Reader type for the input (~func(R) A)
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// - GTA: The generic Reader type for the tuple result (~func(R) T.Tuple1[A])
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// - R: The environment/context type
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// - A: The result type
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func SequenceT1[GA ~func(R) A, GTA ~func(R) T.Tuple1[A], R, A any](a GA) GTA {
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return apply.SequenceT1(
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Map[GA, GTA, R, A, T.Tuple1[A]],
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a,
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)
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}
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// SequenceT2 combines 2 generic Readers into a generic Reader of a 2-tuple.
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// All Readers share the same environment and are evaluated with it.
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//
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// Type Parameters:
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// - GA, GB: The generic Reader types for the inputs (~func(R) A, ~func(R) B)
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// - GTAB: The generic Reader type for the tuple result (~func(R) T.Tuple2[A, B])
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// - R: The environment/context type
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// - A, B: The result types
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func SequenceT2[GA ~func(R) A, GB ~func(R) B, GTAB ~func(R) T.Tuple2[A, B], R, A, B any](a GA, b GB) GTAB {
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return apply.SequenceT2(
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Map[GA, func(R) func(B) T.Tuple2[A, B], R, A, func(B) T.Tuple2[A, B]],
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Ap[GB, GTAB, func(R) func(B) T.Tuple2[A, B], R, B, T.Tuple2[A, B]],
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a, b,
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)
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}
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// SequenceT3 combines 3 generic Readers into a generic Reader of a 3-tuple.
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// All Readers share the same environment and are evaluated with it.
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//
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// Type Parameters:
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// - GA, GB, GC: The generic Reader types for the inputs
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// - GTABC: The generic Reader type for the tuple result (~func(R) T.Tuple3[A, B, C])
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// - R: The environment/context type
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// - A, B, C: The result types
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func SequenceT3[GA ~func(R) A, GB ~func(R) B, GC ~func(R) C, GTABC ~func(R) T.Tuple3[A, B, C], R, A, B, C any](a GA, b GB, c GC) GTABC {
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return apply.SequenceT3(
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Map[GA, func(R) func(B) func(C) T.Tuple3[A, B, C], R, A, func(B) func(C) T.Tuple3[A, B, C]],
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Ap[GB, func(R) func(C) T.Tuple3[A, B, C], func(R) func(B) func(C) T.Tuple3[A, B, C], R, B, func(C) T.Tuple3[A, B, C]],
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Ap[GC, GTABC, func(R) func(C) T.Tuple3[A, B, C], R, C, T.Tuple3[A, B, C]],
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a, b, c,
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)
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}
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// SequenceT4 combines 4 generic Readers into a generic Reader of a 4-tuple.
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// All Readers share the same environment and are evaluated with it.
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//
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// Type Parameters:
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// - GA, GB, GC, GD: The generic Reader types for the inputs
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// - GTABCD: The generic Reader type for the tuple result (~func(R) T.Tuple4[A, B, C, D])
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// - R: The environment/context type
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// - A, B, C, D: The result types
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func SequenceT4[GA ~func(R) A, GB ~func(R) B, GC ~func(R) C, GD ~func(R) D, GTABCD ~func(R) T.Tuple4[A, B, C, D], R, A, B, C, D any](a GA, b GB, c GC, d GD) GTABCD {
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return apply.SequenceT4(
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Map[GA, func(R) func(B) func(C) func(D) T.Tuple4[A, B, C, D], R, A, func(B) func(C) func(D) T.Tuple4[A, B, C, D]],
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Ap[GB, func(R) func(C) func(D) T.Tuple4[A, B, C, D], func(R) func(B) func(C) func(D) T.Tuple4[A, B, C, D], R, B, func(C) func(D) T.Tuple4[A, B, C, D]],
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Ap[GC, func(R) func(D) T.Tuple4[A, B, C, D], func(R) func(C) func(D) T.Tuple4[A, B, C, D], R, C, func(D) T.Tuple4[A, B, C, D]],
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Ap[GD, GTABCD, func(R) func(D) T.Tuple4[A, B, C, D], R, D, T.Tuple4[A, B, C, D]],
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a, b, c, d,
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)
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}
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