NoViableAltException.java

/*******************************************************************************
 * Copyright (c) 2008 Scott Stanchfield.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *   Based on the ANTLR parser generator by Terence Parr, http://antlr.org
 *   Ric Klaren <klaren@cs.utwente.nl>
 *   Scott Stanchfield - Modifications for XML Parsing
 *******************************************************************************/
package com.javadude.antxr;

import com.javadude.antxr.collections.AST;

public class NoViableAltException extends RecognitionException {
	private static final long serialVersionUID = 1L;
	public Token token;
    public AST node;	// handles parsing and treeparsing

    public NoViableAltException(AST t) {
        super("NoViableAlt", "<AST>", t.getLine(), t.getColumn());
        node = t;
    }

    public NoViableAltException(Token t, String fileName_) {
        super("NoViableAlt", fileName_, t.getLine(), t.getColumn());
        token = t;
    }

    /**
     * Returns a clean error message (no line number/column information)
     */
    @Override
    public String getMessage() {
        if (token != null) {
            return "unexpected token: " + token.getText();
        }

        // must a tree parser error if token==null
        if (node == TreeParser.ASTNULL) {
            return "unexpected end of subtree";
        }
        return "unexpected AST node: " + node.toString();
    }
}