1/*
2 * [The "BSD license"]
3 *  Copyright (c) 2010 Terence Parr
4 *  All rights reserved.
5 *
6 *  Redistribution and use in source and binary forms, with or without
7 *  modification, are permitted provided that the following conditions
8 *  are met:
9 *  1. Redistributions of source code must retain the above copyright
10 *      notice, this list of conditions and the following disclaimer.
11 *  2. Redistributions in binary form must reproduce the above copyright
12 *      notice, this list of conditions and the following disclaimer in the
13 *      documentation and/or other materials provided with the distribution.
14 *  3. The name of the author may not be used to endorse or promote products
15 *      derived from this software without specific prior written permission.
16 *
17 *  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 *  IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 *  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 *  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28package org.antlr.tool;
29
30import org.antlr.analysis.DFAState;
31import org.antlr.analysis.DecisionProbe;
32import org.stringtemplate.v4.ST;
33
34import java.util.ArrayList;
35import java.util.Collections;
36import java.util.List;
37
38/** Reports a potential parsing issue with a decision; the decision is
39 *  nondeterministic in some way.
40 */
41public class GrammarDanglingStateMessage extends Message {
42	public DecisionProbe probe;
43	public DFAState problemState;
44
45	public GrammarDanglingStateMessage(DecisionProbe probe,
46									   DFAState problemState)
47	{
48		super(ErrorManager.MSG_DANGLING_STATE);
49		this.probe = probe;
50		this.problemState = problemState;
51	}
52
53	public String toString() {
54		GrammarAST decisionASTNode = probe.dfa.getDecisionASTNode();
55		line = decisionASTNode.getLine();
56		column = decisionASTNode.getCharPositionInLine();
57		String fileName = probe.dfa.nfa.grammar.getFileName();
58		if ( fileName!=null ) {
59			file = fileName;
60		}
61		List labels = probe.getSampleNonDeterministicInputSequence(problemState);
62		String input = probe.getInputSequenceDisplay(labels);
63		ST st = getMessageTemplate();
64		List alts = new ArrayList();
65		alts.addAll(problemState.getAltSet());
66		Collections.sort(alts);
67		st.add("danglingAlts", alts);
68		st.add("input", input);
69
70		return super.toString(st);
71	}
72
73}
74