More features for Json En/Decoders (#18)

More features for Json En/Decoders. Closes #14

branch/src/main/scala/dev/wishingtree/branch/friday/Json.scala

@@ -43,6 +43,12 @@ object Json {
     JsonObject(fields.toMap)
   }
 
+  /** Creates a JSON array from the given values
+    */
+  def arr(values: Json*): JsonArray = {
+    JsonArray(values.toIndexedSeq)
+  }
+
   /** Encode the vale to JSON, returning [[JsonNull]] on failure */
   inline def jsonOrNull[A](a: => A)(using encoder: JsonEncoder[A]): Json = {
     Try(encoder.encode(a)).getOrElse(JsonNull)

branch/src/main/scala/dev/wishingtree/branch/friday/JsonDecoder.scala

@@ -7,6 +7,7 @@ import dev.wishingtree.branch.macaroni.meta.Summons.{
 }
 
 import java.time.Instant
+import scala.collection.*
 import scala.compiletime.*
 import scala.deriving.Mirror
 import scala.util.*
@@ -76,13 +77,44 @@ object JsonDecoder {
       Try(json.numVal.toInt)
   }
 
+  given JsonDecoder[Long] with {
+    def decode(json: Json): Try[Long] =
+      Try(json.numVal.toLong)
+  }
+
   /** A JsonDecoder for Instant
     */
   given JsonDecoder[Instant] with {
     def decode(json: Json): Try[Instant] =
       Try(Instant.parse(json.strVal))
   }
 
+  private[friday] def iterableDecoder[A, F[_]](
+      builder: mutable.Builder[A, F[A]]
+  )(using decoder: JsonDecoder[A]): JsonDecoder[F[A]] =
+    (json: Json) =>
+      Try {
+        json.arrVal.foldLeft(builder)((b, j) => {
+          b.addOne(decoder.decode(j).get)
+        })
+        builder.result()
+      }
+
+  implicit def seqDecoder[A: JsonDecoder]: JsonDecoder[Seq[A]] =
+    iterableDecoder[A, Seq](Seq.newBuilder[A])
+
+  implicit def listDecoder[A: JsonDecoder]: JsonDecoder[List[A]] =
+    iterableDecoder[A, List](List.newBuilder[A])
+
+  implicit def indexedSeqDecoder[A: JsonDecoder]: JsonDecoder[IndexedSeq[A]] =
+    iterableDecoder[A, IndexedSeq](IndexedSeq.newBuilder[A])
+
+  implicit def setDecoder[A: JsonDecoder]: JsonDecoder[Set[A]] =
+    iterableDecoder[A, Set](Set.newBuilder[A])
+
+  implicit def vectorDecoder[A: JsonDecoder]: JsonDecoder[Vector[A]] =
+    iterableDecoder[A, Vector](Vector.newBuilder[A])
+
   private[friday] inline def buildJsonProduct[A](
       p: Mirror.ProductOf[A],
       b: Json

branch/src/main/scala/dev/wishingtree/branch/friday/JsonDecoder.test.scala

@@ -18,4 +18,50 @@ class JsonDecoderSpec extends FunSuite {
     } yield assertEquals(person, Person("Alice", 42))
 
   }
+
+  test("JsonDecoder Json => Seq[A]") {
+
+    val decoder = JsonDecoder.seqDecoder[String]
+    val json    = Json.arr(JsonString("Alice"), JsonString("Bob"))
+    for {
+      seq <- decoder.decode(json)
+    } yield assertEquals(seq, Seq("Alice", "Bob"))
+  }
+
+  test("JsonDecoder Json => List[A]") {
+
+    val decoder = JsonDecoder.listDecoder[String]
+    val json    = Json.arr(JsonString("Alice"), JsonString("Bob"))
+    for {
+      list <- decoder.decode(json)
+    } yield assertEquals(list, List("Alice", "Bob"))
+  }
+
+  test("JsonDecoder Json => Set[A]") {
+
+    val decoder = JsonDecoder.setDecoder[String]
+    val json    = Json.arr(JsonString("Alice"), JsonString("Bob"))
+    for {
+      set <- decoder.decode(json)
+    } yield assertEquals(set, Set("Alice", "Bob"))
+  }
+
+  test("JsonDecoder Json => IndexedSeq[A]") {
+
+    val decoder = JsonDecoder.indexedSeqDecoder[String]
+    val json    = Json.arr(JsonString("Alice"), JsonString("Bob"))
+    for {
+      indexedSeq <- decoder.decode(json)
+    } yield assertEquals(indexedSeq, IndexedSeq("Alice", "Bob"))
+  }
+
+  test("JsonDecoder Json => Vector[A]") {
+
+    val decoder = JsonDecoder.vectorDecoder[String]
+    val json    = Json.arr(JsonString("Alice"), JsonString("Bob"))
+    for {
+      vector <- decoder.decode(json)
+    } yield assertEquals(vector, Vector("Alice", "Bob"))
+  }
+
 }

branch/src/main/scala/dev/wishingtree/branch/friday/JsonEncoder.scala

@@ -1,11 +1,12 @@
 package dev.wishingtree.branch.friday
 
-import dev.wishingtree.branch.friday.Json.{JsonObject, JsonString}
+import dev.wishingtree.branch.friday.Json.{JsonArray, JsonObject, JsonString}
 import dev.wishingtree.branch.macaroni.meta.Summons.summonHigherListOf
 
 import java.time.Instant
 import scala.compiletime.*
 import scala.deriving.Mirror
+import scala.reflect.ClassTag
 
 /** A type-class for encoding values to Json
   */
@@ -82,12 +83,49 @@ object JsonEncoder {
     def encode(a: Int): Json = Json.JsonNumber(a.toDouble)
   }
 
+  /** A JsonEncoder for Longs
+    */
+  given JsonEncoder[Long] with {
+    def encode(a: Long): Json = Json.JsonNumber(a.toDouble)
+  }
+
   /** A JsonEncoder for Instants
     */
   given JsonEncoder[Instant] with {
     def encode(a: Instant): Json = JsonString(a.toString)
   }
 
+  /** Helper method for collection/iterable JsonEncoders */
+  private[friday] def iterableEncoder[A, F[X] <: Iterable[X]](using
+      jsonEncoder: JsonEncoder[A]
+  ): JsonEncoder[F[A]] =
+    (a: F[A]) => JsonArray(a.iterator.map(jsonEncoder.encode).toIndexedSeq)
+
+  /** A JsonEncoder for Seqs
+    */
+  implicit def seqEncoder[A: JsonEncoder]: JsonEncoder[Seq[A]] =
+    iterableEncoder[A, Seq]
+
+  /** A JsonEncoder for Lists
+    */
+  implicit def listEncoder[A: JsonEncoder]: JsonEncoder[List[A]] =
+    iterableEncoder[A, List]
+
+  /** A JsonEncoder for IndexedSeqs
+    */
+  implicit def indexedSeqEncoder[A: JsonEncoder]: JsonEncoder[IndexedSeq[A]] =
+    iterableEncoder[A, IndexedSeq]
+
+  /** A JsonEncoder for Sets
+    */
+  implicit def setEncoder[A: JsonEncoder]: JsonEncoder[Set[A]] =
+    iterableEncoder[A, Set]
+
+  /** A JsonEncoder for Vectors
+    */
+  implicit def vectorEncoder[A: JsonEncoder]: JsonEncoder[Vector[A]] =
+    iterableEncoder[A, Vector]
+
   private[friday] inline def buildJsonProduct[A](
       a: A
   )(using m: Mirror.Of[A]): Json = {

branch/src/main/scala/dev/wishingtree/branch/friday/JsonEncoder.test.scala

@@ -18,4 +18,36 @@ class JsonEncoderSpec extends FunSuite {
     )
   }
 
+  test("JsonEncoder A => Seq[A]") {
+    val strSeqEncoder = summon[JsonEncoder[Seq[String]]]
+    assertEquals(
+      strSeqEncoder.encode(Seq("Alice", "Bob")),
+      Json.arr(JsonString("Alice"), JsonString("Bob"))
+    )
+  }
+
+  test("JsonEncoder A => List[A]") {
+    val strListEncoder = summon[JsonEncoder[List[String]]]
+    assertEquals(
+      strListEncoder.encode(List("Alice", "Bob")),
+      Json.arr(JsonString("Alice"), JsonString("Bob"))
+    )
+  }
+
+  test("JsonEncoder A => Vector[A]") {
+    val strVectorEncoder = summon[JsonEncoder[Vector[String]]]
+    assertEquals(
+      strVectorEncoder.encode(Vector("Alice", "Bob")),
+      Json.arr(JsonString("Alice"), JsonString("Bob"))
+    )
+  }
+
+  test("JsonEncoder A => Set[A]") {
+    val strSetEncoder = summon[JsonEncoder[Set[String]]]
+    assertEquals(
+      strSetEncoder.encode(Set("Alice", "Bob")),
+      Json.arr(JsonString("Alice"), JsonString("Bob"))
+    )
+  }
+
 }