A compact tree printer, for primitives like mys...

A compact tree printer, for primitives like myself who do all their
debugging in the console and need extraneous information filtered out.
New option: -Ycompact-trees. Supply that in conjunction with -Xprint:all
and suddenly the output is a (relative) masterpiece of concision. Review
by anyone who is game to review such a thing. Community?

1 files changed, 40 insertions, 0 deletions

diff --git a/test/files/run/treePrint.scala b/test/files/run/treePrint.scala
new file mode 100644
index 0000000000..ffe9a392d4
--- /dev/null
+++ b/test/files/run/treePrint.scala
@@ -0,0 +1,40 @@
+/** Testing compact tree printers.
+ */
+object Test {
+  import scala.tools.nsc._
+  import java.io.{ OutputStream, BufferedReader, StringReader, PrintWriter, Writer, OutputStreamWriter}
+
+  val code = """
+    def foo = {
+      var q: Boolean = false
+      val x = if (true) {
+        if (true) {
+          if (true) {
+            5
+          }
+          else if (true) {
+            5
+          } else {
+            10
+          }
+        }
+        else 20
+      }
+      else 30
+
+      (x == 5) || !q || true
+    }
+  """
+
+  class NullOutputStream extends OutputStream { def write(b: Int) { } }
+
+  def main(args: Array[String]) {
+    val settings = new Settings
+    settings.classpath.value = System.getProperty("java.class.path")
+    settings.Ycompacttrees.value = true
+
+    val repl = new Interpreter(settings, new PrintWriter(new NullOutputStream))
+    repl.interpret("""def initialize = "Have to interpret something or we get errors." """)
+    println(repl mkTree code)
+  }
+}