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