1 files changed, 50 insertions, 0 deletions
diff --git a/src/compiler/scala/tools/reflect/FrontEnd.scala b/src/compiler/scala/tools/reflect/FrontEnd.scala
new file mode 100644
index 0000000000..f0d3d5973d
--- /dev/null
+++ b/src/compiler/scala/tools/reflect/FrontEnd.scala
@@ -0,0 +1,50 @@
+package scala.tools
+package reflect
+
+import scala.reflect.internal.util.Position
+
+trait FrontEnd {
+  object severity extends Enumeration
+  class Severity(val id: Int) extends severity.Value {
+    var count: Int = 0
+    override def toString() = this match {
+      case INFO => "INFO"
+      case WARNING => "WARNING"
+      case ERROR => "ERROR"
+      case _ => "<unknown>"
+    }
+  }
+  val INFO    = new Severity(0)
+  val WARNING = new Severity(1)
+  val ERROR   = new Severity(2)
+
+  def hasErrors   = ERROR.count > 0
+  def hasWarnings = WARNING.count > 0
+
+  case class Info(val pos: Position, val msg: String, val severity: Severity)
+  val infos = new scala.collection.mutable.LinkedHashSet[Info]
+
+  /** Handles incoming info */
+  def log(pos: Position, msg: String, severity: Severity) {
+    infos += new Info(pos, msg, severity)
+    severity.count += 1
+    display(infos.last)
+  }
+
+  /** Displays incoming info */
+  def display(info: Info): Unit
+
+  /** Services a request to drop into interactive mode */
+  def interactive(): Unit
+
+  /** Refreshes the UI */
+  def flush(): Unit = {}
+
+  /** Resets the reporter */
+  def reset(): Unit = {
+    INFO.count = 0
+    WARNING.count = 0
+    ERROR.count = 0
+    infos.clear()
+  }
+}