From 1103d48fb7bf6586f1609151bdcc74e27c9139d5 Mon Sep 17 00:00:00 2001
From: François Garillot <francois@garillot.net>
Date: Wed, 11 Sep 2013 15:34:34 +0200
Subject: Add trait keeping comments across new Typer runs

---
 src/compiler/scala/tools/nsc/typechecker/Typers.scala    |  7 ++++++-
 src/interactive/scala/tools/nsc/interactive/Global.scala | 13 +++++++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/compiler/scala/tools/nsc/typechecker/Typers.scala b/src/compiler/scala/tools/nsc/typechecker/Typers.scala
index 55268b1e1a..5c8f1bd1c7 100644
--- a/src/compiler/scala/tools/nsc/typechecker/Typers.scala
+++ b/src/compiler/scala/tools/nsc/typechecker/Typers.scala
@@ -43,12 +43,17 @@ trait Typers extends Adaptations with Tags with TypersTracking with PatternTyper
 
   final val shortenImports = false
 
+  // allows override of the behavior of the resetTyper method w.r.t comments
+  def resetDocComments() = {
+    clearDocComments()
+  }
+
   def resetTyper() {
     //println("resetTyper called")
     resetContexts()
     resetImplicits()
     transformed.clear()
-    clearDocComments()
+    resetDocComments()
   }
 
   object UnTyper extends Traverser {
diff --git a/src/interactive/scala/tools/nsc/interactive/Global.scala b/src/interactive/scala/tools/nsc/interactive/Global.scala
index bc6df9eb25..736a1e68c4 100644
--- a/src/interactive/scala/tools/nsc/interactive/Global.scala
+++ b/src/interactive/scala/tools/nsc/interactive/Global.scala
@@ -18,6 +18,19 @@ import scala.tools.nsc.typechecker.Analyzer
 import symtab.Flags.{ACCESSOR, PARAMACCESSOR}
 import scala.annotation.{ elidable, tailrec }
 import scala.language.implicitConversions
+import scala.tools.nsc.typechecker.Typers
+
+/**
+ * This trait allows the IDE to have an instance of the PC that
+ * does not clear the comments table at every new typer run (those
+ * being many and close between in this context).
+ */
+
+trait CommentPreservingTypers extends Typers {
+  self: Analyzer =>
+
+  override def resetDocComments() = {}
+}
 
 trait InteractiveScaladocAnalyzer extends InteractiveAnalyzer with ScaladocAnalyzer {
   val global : Global
-- 
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