Move JValue format here

internal/util-logging/src/main/scala/sbt/internal/util/codec/JValueFormats.scala

@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2017 Lightbend Inc. <http://www.lightbend.com>
+ */
+
+package sbt
+package internal
+package util.codec
+
+import sjsonnew.{ JsonWriter => JW, JsonReader => JR, JsonFormat => JF, _ }
+import scala.json.ast.unsafe._
+
+trait JValueFormats { self: sjsonnew.BasicJsonProtocol =>
+  implicit val JNullFormat: JF[JNull.type] = new JF[JNull.type] {
+    def write[J](x: JNull.type, b: Builder[J]) = b.writeNull()
+    def read[J](j: Option[J], u: Unbuilder[J]) = JNull
+  }
+
+  implicit val JBooleanFormat: JF[JBoolean] = project(_.get, (x: Boolean) => JBoolean(x))
+  implicit val JStringFormat: JF[JString] = project(_.value, (x: String) => JString(x))
+  implicit val JNumberFormat: JF[JNumber] = project(x => BigDecimal(x.value), (x: BigDecimal) => JNumber(x.toString))
+  implicit val JArrayFormat: JF[JArray] = project[JArray, Array[JValue]](_.value, JArray(_))
+
+  implicit lazy val JObjectJsonWriter: JW[JObject] = new JW[JObject] {
+    def write[J](x: JObject, b: Builder[J]) = {
+      b.beginObject()
+      x.value foreach (jsonField => JValueFormat.addField(jsonField.field, jsonField.value, b))
+      b.endObject()
+    }
+  }
+
+  implicit lazy val JValueJsonWriter: JW[JValue] = new JW[JValue] {
+    def write[J](x: JValue, b: Builder[J]) = x match {
+      case x: JNull.type => JNullFormat.write(x, b)
+      case x: JBoolean   => JBooleanFormat.write(x, b)
+      case x: JString    => JStringFormat.write(x, b)
+      case x: JNumber    => JNumberFormat.write(x, b)
+      case x: JArray     => JArrayFormat.write(x, b)
+      case x: JObject    => JObjectJsonWriter.write(x, b)
+    }
+  }
+
+  implicit lazy val JValueJsonReader: JR[JValue] = new JR[JValue] {
+    def read[J](j: Option[J], u: Unbuilder[J]) = ??? // Is this even possible? with no Manifest[J]?
+  }
+
+  implicit lazy val JValueFormat: JF[JValue] = jsonFormat[JValue](JValueJsonReader, JValueJsonWriter)
+}