87 lines
2.9 KiB
C#
87 lines
2.9 KiB
C#
/*
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[The "BSD licence"]
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Copyright (c) 2005-2007 Kunle Odutola
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code MUST RETAIN the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form MUST REPRODUCE the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the
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distribution.
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3. The name of the author may not be used to endorse or promote products
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derived from this software without specific prior WRITTEN permission.
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4. Unless explicitly state otherwise, any contribution intentionally
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submitted for inclusion in this work to the copyright owner or licensor
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shall be under the terms and conditions of this license, without any
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additional terms or conditions.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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namespace Antlr.Runtime.Debug
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{
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using System;
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using Antlr.Runtime;
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using ITreeAdaptor = Antlr.Runtime.Tree.ITreeAdaptor;
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using ITreeNodeStream = Antlr.Runtime.Tree.ITreeNodeStream;
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/// <summary>
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/// The default tracer mimics the traceParser behavior of ANTLR 2.x.
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/// This listens for debugging events from the parser and implies
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/// that you cannot debug and trace at the same time.
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/// </summary>
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public class Tracer : BlankDebugEventListener
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{
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public IIntStream input;
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protected int level = 0;
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public Tracer(IIntStream input)
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{
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this.input = input;
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}
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override public void EnterRule(string grammarFileName, string ruleName)
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{
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for (int i = 1; i <= level; i++)
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{
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Console.Out.Write(" ");
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}
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Console.Out.WriteLine("> " + grammarFileName + " " + ruleName + " lookahead(1)=" + GetInputSymbol(1));
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level++;
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}
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override public void ExitRule(string grammarFileName, string ruleName)
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{
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level--;
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for (int i = 1; i <= level; i++)
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{
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Console.Out.Write(" ");
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}
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Console.Out.WriteLine("< " + grammarFileName + " " + ruleName + " lookahead(1)=" + GetInputSymbol(1));
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}
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public virtual object GetInputSymbol(int k)
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{
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if (input is ITokenStream)
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{
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return ((ITokenStream) input).LT(k);
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}
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return (char) input.LA(k);
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}
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}
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} |