Move compiler and compiler tests to compiler dir

1 files changed, 32 insertions, 0 deletions

diff --git a/compiler/src/dotty/tools/dotc/reporting/UniqueMessagePositions.scala b/compiler/src/dotty/tools/dotc/reporting/UniqueMessagePositions.scala
new file mode 100644
index 000000000..6fd971c2a
--- /dev/null
+++ b/compiler/src/dotty/tools/dotc/reporting/UniqueMessagePositions.scala
@@ -0,0 +1,32 @@
+package dotty.tools
+package dotc
+package reporting
+
+import scala.collection.mutable
+import util.{SourcePosition, SourceFile}
+import core.Contexts.Context
+import diagnostic.MessageContainer
+
+/** This trait implements `isHidden` so that multiple messages per position
+  * are suppressed, unless they are of increasing severity. */
+trait UniqueMessagePositions extends Reporter {
+
+  private val positions = new mutable.HashMap[(SourceFile, Int), Int]
+
+  /** Logs a position and returns true if it was already logged.
+   *  @note  Two positions are considered identical for logging if they have the same point.
+   */
+  override def isHidden(m: MessageContainer)(implicit ctx: Context): Boolean =
+    super.isHidden(m) || {
+      m.pos.exists && {
+        var shouldHide = false
+        for (pos <- m.pos.start to m.pos.end) {
+          positions get (ctx.source, pos) match {
+            case Some(level) if level >= m.level => shouldHide = true
+            case _ => positions((ctx.source, pos)) = m.level
+          }
+        }
+        shouldHide
+      }
+    }
+}