1 files changed, 64 insertions, 0 deletions
diff --git a/sources/scala/tools/scalac/typechecker/Context.scala b/sources/scala/tools/scalac/typechecker/Context.scala
new file mode 100644
index 0000000000..e281ce649f
--- /dev/null
+++ b/sources/scala/tools/scalac/typechecker/Context.scala
@@ -0,0 +1,64 @@
+/*     ____ ____  ____ ____  ______                                     *\
+**    / __// __ \/ __// __ \/ ____/    SOcos COmpiles Scala             **
+**  __\_ \/ /_/ / /__/ /_/ /\_ \       (c) 2002, LAMP/EPFL              **
+** /_____/\____/\___/\____/____/                                        **
+**
+** $Id$
+\*                                                                      */
+package scala.tools.scalac.typechecker;
+
+import scalac.symtab._;
+import scalac.ast.Tree;
+import scalac.ast._;
+
+object Context {
+  val NONE = new Context();
+}
+
+class Context {
+
+  var tree: Tree = _;                 // Tree associated with this context
+  var owner: Symbol = _;              // The current owner
+  var scope: Scope = _;               // The current scope
+  var imports: ImportList = _;        // The current import list
+  var outer: Context = _;             // The next outer context
+  var enclClass: Context = this;      // The next outer context whose tree
+                                      // is a class template
+  var variance: int = _;              // Variance relative to enclosing class.
+  var constructorClass: Symbol = _;   // Class for auxiliary constructor
+
+  def this(tree: Tree, owner: Symbol, scope: Scope, outer: Context) = {
+    this();
+    this.tree = tree;
+    this.owner = owner;
+    this.scope = scope;
+    this.imports = outer.imports;
+    this.enclClass = if (tree.isInstanceOf[Tree$Template] ||
+			 tree.isInstanceOf[Tree$CompoundType]) this
+		     else outer.enclClass;
+    this.variance = outer.variance;
+    this.constructorClass = outer.constructorClass;
+    this.outer = outer;
+  }
+
+  def this(tree: Tree, outer: Context) =
+    this(tree, outer.owner, outer.scope, outer);
+
+  def outerContext(clazz: Symbol): Context = {
+    var c = this;
+    while (c != Context.NONE && c.owner != clazz) c = c.outer;
+    c
+  }
+
+  def isTopLevel(): boolean = tree match {
+    case Tree$Block(_) =>
+      false
+    case Tree$Template(_, _) =>
+      outer.tree.isInstanceOf[Tree$PackageDef]
+    case Tree.Empty =>
+      true
+    case _ =>
+      outer.isTopLevel()
+  }
+}
+