Add Printable (#270)

Printable is a new type that changes how printing of Chisel types is represented
It uses an ordered collection rather than a format string and specifiers
Features:
 - Custom String Interpolator for Scala-like printf
 - String-like manipulation of "hardware strings" for custom pretty-printing
 - Default pretty-printing for Chisel data types

1 files changed, 6 insertions, 0 deletions

diff --git a/chiselFrontend/src/main/scala/chisel3/core/Data.scala b/chiselFrontend/src/main/scala/chisel3/core/Data.scala
index 5ae8c84d..573632ab 100644
--- a/chiselFrontend/src/main/scala/chisel3/core/Data.scala
+++ b/chiselFrontend/src/main/scala/chisel3/core/Data.scala
@@ -132,6 +132,9 @@ abstract class Data(dirArg: Direction) extends HasId {
 
   def do_asUInt(implicit sourceInfo: SourceInfo): UInt =
     SeqUtils.do_asUInt(this.flatten)(sourceInfo)
+
+  /** Default pretty printing */
+  def toPrintable: Printable
 }
 
 object Wire {
@@ -171,4 +174,7 @@ sealed class Clock(dirArg: Direction) extends Element(dirArg, Width(1)) {
     case _: Clock => this connect that
     case _ => this badConnect that
   }
+
+  /** Not really supported */
+  def toPrintable: Printable = PString("CLOCK")
 }