1 files changed, 63 insertions, 0 deletions
diff --git a/sources/scalac/typechecker/Context.java b/sources/scalac/typechecker/Context.java
new file mode 100644
index 0000000000..3f1b30388f
--- /dev/null
+++ b/sources/scalac/typechecker/Context.java
@@ -0,0 +1,63 @@
+/*     ____ ____  ____ ____  ______                                     *\
+**    / __// __ \/ __// __ \/ ____/    SOcos COmpiles Scala             **
+**  __\_ \/ /_/ / /__/ /_/ /\_ \       (c) 2002, LAMP/EPFL              **
+** /_____/\____/\___/\____/____/                                        **
+**
+** $Id$
+\*                                                                      */
+
+package scalac.typechecker;
+
+import scalac.symtab.*;
+import scalac.ast.Tree;
+
+public class Context {
+    Tree tree;                 // Tree associated with this context
+    Symbol owner;              // The current owner
+    Scope scope;               // The current scope
+    ImportList imports;        // The current import list
+    Context outer;             // The next outer context
+    Context enclClass = this;  // The next outer context whose tree
+                               // is a class template
+    boolean delayArgs = false; // delay checking of type arguments
+
+    public Context() {}
+
+    public Context(Tree tree, Context outer) {
+        this(tree, outer.owner, outer.scope, outer);
+    }
+
+    public Context(Tree tree, Symbol owner, Scope scope, Context outer) {
+	this.tree = tree;
+	this.owner = owner;
+	this.scope = scope;
+	this.imports = outer.imports;
+	if (tree instanceof Tree.Template ||
+	    tree instanceof Tree.CompoundType) this.enclClass = this;
+	else this.enclClass = outer.enclClass;
+	this.delayArgs = outer.delayArgs;
+	this.outer = outer;
+    }
+
+    public static Context NONE = new Context();
+
+    Context outerContext(Symbol clazz) {
+	Context c = this;
+	while (c != Context.NONE && c.owner != clazz) c = c.outer;
+	return c;
+    }
+
+    boolean isTopLevel() {
+	switch (tree) {
+	case Block(_):
+	    return false;
+	case Template(_, _):
+	    return outer.tree instanceof Tree.PackageDef;
+	case Empty:
+	    return true;
+	default:
+	    return outer.isTopLevel();
+	}
+    }
+}
+