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package firrtl
package annotations
import scala.util.{Try, Failure}
import org.json4s._
import org.json4s.native.JsonMethods._
import org.json4s.native.Serialization
import org.json4s.native.Serialization.{read, write, writePretty}
import firrtl.ir._
import firrtl.Utils.error
object JsonProtocol {
class TransformClassSerializer extends CustomSerializer[Class[_ <: Transform]](format => (
{ case JString(s) => Class.forName(s).asInstanceOf[Class[_ <: Transform]] },
{ case x: Class[_] => JString(x.getName) }
))
// TODO Reduce boilerplate?
class NamedSerializer extends CustomSerializer[Named](format => (
{ case JString(s) => AnnotationUtils.toNamed(s) },
{ case named: Named => JString(named.serialize) }
))
class CircuitNameSerializer extends CustomSerializer[CircuitName](format => (
{ case JString(s) => AnnotationUtils.toNamed(s).asInstanceOf[CircuitName] },
{ case named: CircuitName => JString(named.serialize) }
))
class ModuleNameSerializer extends CustomSerializer[ModuleName](format => (
{ case JString(s) => AnnotationUtils.toNamed(s).asInstanceOf[ModuleName] },
{ case named: ModuleName => JString(named.serialize) }
))
class ComponentNameSerializer extends CustomSerializer[ComponentName](format => (
{ case JString(s) => AnnotationUtils.toNamed(s).asInstanceOf[ComponentName] },
{ case named: ComponentName => JString(named.serialize) }
))
/** Construct Json formatter for annotations */
def jsonFormat(tags: Seq[Class[_ <: Annotation]]) = {
Serialization.formats(FullTypeHints(tags.toList)).withTypeHintFieldName("class") +
new TransformClassSerializer + new NamedSerializer + new CircuitNameSerializer +
new ModuleNameSerializer + new ComponentNameSerializer
}
/** Serialize annotations to a String for emission */
def serialize(annos: Seq[Annotation]): String = serializeTry(annos).get
def serializeTry(annos: Seq[Annotation]): Try[String] = {
val tags = annos.map(_.getClass).distinct
implicit val formats = jsonFormat(tags)
Try(writePretty(annos))
}
def deserialize(in: JsonInput): Seq[Annotation] = deserializeTry(in).get
def deserializeTry(in: JsonInput): Try[Seq[Annotation]] = Try({
val parsed = parse(in)
val annos = parsed match {
case JArray(objs) => objs
case x => throw new InvalidAnnotationJSONException(
s"Annotations must be serialized as a JArray, got ${x.getClass.getSimpleName} instead!")
}
// Gather classes so we can deserialize arbitrary Annotations
val classes = annos.map({
case JObject(("class", JString(c)) :: tail) => c
case obj => throw new InvalidAnnotationJSONException(s"Expected field 'class' not found! $obj")
}).distinct
val loaded = classes.map(Class.forName(_).asInstanceOf[Class[_ <: Annotation]])
implicit val formats = jsonFormat(loaded)
read[List[Annotation]](in)
}).recoverWith {
// Translate some generic errors to specific ones
case e: java.lang.ClassNotFoundException =>
Failure(new AnnotationClassNotFoundException(e.getMessage))
case e: org.json4s.ParserUtil.ParseException =>
Failure(new InvalidAnnotationJSONException(e.getMessage))
}.recoverWith { // If the input is a file, wrap in InvalidAnnotationFileException
case e => in match {
case FileInput(file) =>
Failure(new InvalidAnnotationFileException(file, e))
case _ => Failure(e)
}
}
}
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