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https://github.com/marcin-szczepanski/jFuzzyLogic.git
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102 lines
3.7 KiB
Java
102 lines
3.7 KiB
Java
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/*
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[The "BSD licence"]
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Copyright (c) 2005-2006 Terence Parr
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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 the
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documentation and/or other materials provided with the 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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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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package org.antlr.test;
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import org.antlr.analysis.DFA;
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import org.antlr.analysis.NFA;
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import org.antlr.runtime.ANTLRStringStream;
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import org.antlr.tool.Grammar;
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public class TestDFAMatching extends BaseTest {
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/** Public default constructor used by TestRig */
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public TestDFAMatching() {
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}
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public void testSimpleAltCharTest() throws Exception {
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Grammar g = new Grammar(
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"lexer grammar t;\n"+
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"A : {;}'a' | 'b' | 'c';");
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g.buildNFA();
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g.createLookaheadDFAs(false);
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DFA dfa = g.getLookaheadDFA(1);
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checkPrediction(dfa,"a",1);
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checkPrediction(dfa,"b",2);
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checkPrediction(dfa,"c",3);
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checkPrediction(dfa,"d", NFA.INVALID_ALT_NUMBER);
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}
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public void testSets() throws Exception {
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Grammar g = new Grammar(
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"lexer grammar t;\n"+
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"A : {;}'a'..'z' | ';' | '0'..'9' ;");
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g.buildNFA();
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g.createLookaheadDFAs(false);
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DFA dfa = g.getLookaheadDFA(1);
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checkPrediction(dfa,"a",1);
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checkPrediction(dfa,"q",1);
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checkPrediction(dfa,"z",1);
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checkPrediction(dfa,";",2);
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checkPrediction(dfa,"9",3);
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}
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public void testFiniteCommonLeftPrefixes() throws Exception {
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Grammar g = new Grammar(
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"lexer grammar t;\n"+
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"A : 'a' 'b' | 'a' 'c' | 'd' 'e' ;");
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g.buildNFA();
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g.createLookaheadDFAs(false);
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DFA dfa = g.getLookaheadDFA(1);
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checkPrediction(dfa,"ab",1);
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checkPrediction(dfa,"ac",2);
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checkPrediction(dfa,"de",3);
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checkPrediction(dfa,"q", NFA.INVALID_ALT_NUMBER);
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}
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public void testSimpleLoops() throws Exception {
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Grammar g = new Grammar(
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"lexer grammar t;\n"+
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"A : (DIGIT)+ '.' DIGIT | (DIGIT)+ ;\n" +
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"fragment DIGIT : '0'..'9' ;\n");
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g.buildNFA();
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g.createLookaheadDFAs(false);
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DFA dfa = g.getLookaheadDFA(3);
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checkPrediction(dfa,"32",2);
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checkPrediction(dfa,"999.2",1);
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checkPrediction(dfa,".2", NFA.INVALID_ALT_NUMBER);
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}
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protected void checkPrediction(DFA dfa, String input, int expected)
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throws Exception
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{
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ANTLRStringStream stream = new ANTLRStringStream(input);
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assertEquals(dfa.predict(stream), expected);
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}
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}
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