New parser tests

… which take some statistics.

So far (on a Macbook pro): code base tested = scala/src + dotty/src

lines: 290'000
nodes created: ~1'004'000
parse times + tree building times after 10 iterations: 700-750ms, i.e. ~ 400Klines/sec
full transform of 1M nodes without tree copying: ~50ms
full transform with full copying: 150-200ms

1 files changed, 8 insertions, 0 deletions

diff --git a/test/test/ParserTest.scala b/test/test/ParserTest.scala
index 32bfdfe28..ae5c3fdc4 100644
--- a/test/test/ParserTest.scala
+++ b/test/test/ParserTest.scala
@@ -7,12 +7,19 @@ import dotty.tools.dotc.parsing._
 import Tokens._, Parsers._
 import UntypedTrees.untpd._
 import org.junit.Test
+import scala.collection.mutable.ListBuffer
 
 class ParserTest extends DottyTest {
 
   def parse(name: String): Tree = parse(new PlainFile(name))
 
   var parsed = 0
+  val parsedTrees = new ListBuffer[Tree]
+
+  def reset() = {
+    parsed = 0
+    parsedTrees.clear()
+  }
 
   def parse(file: PlainFile): Tree = {
     //println("***** parsing " + file)
@@ -20,6 +27,7 @@ class ParserTest extends DottyTest {
     val parser = new Parser(source)
     val tree = parser.parse()
     parsed += 1
+    parsedTrees += tree
     tree
   }