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RecordLike.scala
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RecordLike.scala
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/*
* Copyright 2023 record4s authors
*
* 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 com.github.tarao.record4s
import scala.compiletime.{constValueOpt, erasedValue, error, summonInline}
import scala.deriving.Mirror
import scala.util.NotGiven
trait RecordLike[R] {
type FieldTypes
type ElemLabels <: Tuple
type ElemTypes <: Tuple
type Tags = Any
type TupledFieldTypes = Tuple.Zip[ElemLabels, ElemTypes]
type Ordered <: Boolean
def iterableOf(r: R): Iterable[(String, Any)]
inline def forceOrderedIterableOf(r: R): Iterable[(String, Any)] =
tidiedIterableOf(r, true)
inline def orderedIterableOf(r: R): Iterable[(String, Any)] =
inline erasedValue[Ordered] match {
case _: true =>
tidiedIterableOf(r, false)
case _ =>
tidiedIterableOf(r, true)
}
inline def tidiedIterableOf(r: R): Iterable[(String, Any)] =
tidiedIterableOf(r, false)
inline def tidiedIterableOf(
r: R,
reorder: Boolean,
): Iterable[(String, Any)] = {
val labels = elemLabels
val it = iterableOf(r)
if (reorder || labels.size != it.size) {
val m = it.toMap
labels.map(l => (l, m(l)))
} else {
it
}
}
inline def elemLabels: Seq[String] = RecordLike.seqOfLabels[ElemLabels]
}
object RecordLike {
private[record4s] inline def seqOfLabels[T <: Tuple]: Seq[String] =
inline erasedValue[T] match {
case _: EmptyTuple => Seq.empty
case _: (t *: ts) =>
val stringOf = summonInline[t <:< String]
inline constValueOpt[t] match {
case Some(value) =>
stringOf(value) +: seqOfLabels[ts]
case None =>
error(
"Types of field labels must be literal string types.\n" + "Found: " + Macros
.typeNameOf[t] + "\nRequired: (a literal string type)",
)
}
}
final class OfProduct[
P <: Product,
ElemLabels0 <: Tuple,
ElemTypes0 <: Tuple,
] extends RecordLike[P] {
type FieldTypes = Tuple.Zip[ElemLabels0, ElemTypes0]
type ElemLabels = ElemLabels0
type ElemTypes = ElemTypes0
type Ordered = true
def iterableOf(p: P): Iterable[(String, Any)] =
p.productElementNames.zip(p.productIterator).toSeq
}
given ofProduct[P <: Product](using
m: Mirror.Of[P],
nonRecord: NotGiven[P <:< Record],
nonTuple: NotGiven[P <:< Tuple],
): OfProduct[P, m.MirroredElemLabels, m.MirroredElemTypes] =
new OfProduct
type LabelsOf[T <: Tuple] <: Tuple = T match {
case (l, _) *: tail => l *: LabelsOf[tail]
case head *: tail => LabelsOf[tail]
case _ => EmptyTuple
}
type TypesOf[T] <: Tuple = T match {
case (_, t) *: tail => t *: TypesOf[tail]
case head *: tail => TypesOf[tail]
case _ => EmptyTuple
}
final class OfTuple[T <: Tuple] extends RecordLike[T] {
type FieldTypes = T
type ElemLabels = LabelsOf[T]
type ElemTypes = TypesOf[T]
type Ordered = true
def iterableOf(tp: T): Iterable[(String, Any)] =
tp.productIterator
.collect { case (label: String, value) =>
(label, value)
}
.toSeq
}
given ofTuple[T <: Tuple](using T <:< Tuple): OfTuple[T] = new OfTuple
}