1 files changed, 85 insertions, 0 deletions
diff --git a/runtime/CSharp3/Sources/Antlr3.Runtime.Debug/Tracer.cs b/runtime/CSharp3/Sources/Antlr3.Runtime.Debug/Tracer.cs
new file mode 100644
index 0000000..c99d4f7
--- /dev/null
+++ b/runtime/CSharp3/Sources/Antlr3.Runtime.Debug/Tracer.cs
@@ -0,0 +1,85 @@
+/*
+ * [The "BSD licence"]
+ * Copyright (c) 2005-2008 Terence Parr
+ * All rights reserved.
+ *
+ * Conversion to C#:
+ * Copyright (c) 2008-2009 Sam Harwell, Pixel Mine, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+namespace Antlr.Runtime.Debug
+{
+    using Antlr.Runtime.JavaExtensions;
+
+    using Console = System.Console;
+
+    /** <summary>
+     *  The default tracer mimics the traceParser behavior of ANTLR 2.x.
+     *  This listens for debugging events from the parser and implies
+     *  that you cannot debug and trace at the same time.
+     *  </summary>
+     */
+    public class Tracer : BlankDebugEventListener
+    {
+        public IIntStream input;
+        protected int level = 0;
+
+        public Tracer( IIntStream input )
+        {
+            this.input = input;
+        }
+
+        public virtual void EnterRule( string ruleName )
+        {
+            for ( int i = 1; i <= level; i++ )
+            {
+                Console.Out.Write( " " );
+            }
+            Console.Out.WriteLine( "> " + ruleName + " lookahead(1)=" + GetInputSymbol( 1 ) );
+            level++;
+        }
+
+        public virtual void ExitRule( string ruleName )
+        {
+            level--;
+            for ( int i = 1; i <= level; i++ )
+            {
+                Console.Out.Write( " " );
+            }
+            Console.Out.WriteLine( "< " + ruleName + " lookahead(1)=" + GetInputSymbol( 1 ) );
+        }
+
+        public virtual object GetInputSymbol( int k )
+        {
+            if ( input is ITokenStream )
+            {
+                return ( (ITokenStream)input ).LT( k );
+            }
+            return (char)input.LA( k );
+        }
+    }
+}
+