| /* |
| * [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 ); |
| } |
| } |
| } |
| |