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/*
* $Id: prefixExample.java,v 1.7 2003/11/07 20:16:23 dfs Exp $
*
* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation", "Jakarta-Oro"
* must not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact [email protected].
*
* 5. Products derived from this software may not be called "Apache"
* or "Jakarta-Oro", nor may "Apache" or "Jakarta-Oro" appear in their
* name, without prior written permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* .
*/
package examples;
import org.apache.oro.text.regex.*;
/**
* This is a test program demonstrating an application of the matchesPrefix()
* methods introduced in OROMatcher v1.0.6. This example program shows how
* you might tokenize a stream of input using whitespace as a token
* separator. Don't forget to use quotes around the input on the command
* line, e.g.
* java prefixExample "Test to see if 1.0 is real and 2 is an integer"
*
* If you don't need the power of a full blown lexer generator, you can
* easily use regular expressions to create your own tokenization and
* simple parsing classes using similar approaches.
*
* @version @version@
*/
public final class prefixExample {
public static final int REAL = 0;
public static final int INTEGER = 1;
public static final int STRING = 2;
public static final String[] types = { "Real", "Integer", "String" };
public static final String whitespace = "\\s+";
public static final String[] tokens = {
"-?\\d*\\.\\d+(?:[eE][-+]-?\\d+)?(?=\\s|$)", "-?\\d+(?=\\s|$)", "\\S+"
};
public static final String tokens2 =
"(-?\\d*\\.\\d+(?:[eE][-+]-?\\d+)?(?=\\s|$))|(-?\\d+(?=\\s|$))|(\\S+)";
public static final void main(String args[]) {
int token;
PatternMatcherInput input;
PatternMatcher matcher;
PatternCompiler compiler;
Pattern[] patterns;
Pattern tokenSeparator = null, patterns2 = null;
if(args.length < 1) {
System.err.println("Usage: prefixExample ");
System.exit(1);
}
input = new PatternMatcherInput(args[0]);
compiler = new Perl5Compiler();
patterns = new Pattern[tokens.length];
try {
tokenSeparator = compiler.compile(whitespace);
patterns2 = compiler.compile(tokens2);
for(token=0; token < tokens.length; token++)
patterns[token] = compiler.compile(tokens[token]);
} catch(MalformedPatternException e) {
System.err.println("Bad pattern.");
e.printStackTrace();
System.exit(1);
}
matcher = new Perl5Matcher();
System.out.println("\nOne approach.\n");
do {
for(token = 0; token < tokens.length; token++)
if(matcher.matchesPrefix(input, patterns[token])) {
System.out.println(types[token] + ": " + matcher.getMatch());
break;
}
} while(matcher.contains(input, tokenSeparator));
// An alternative approach using the tokens2 expression which
// packs all the token patterns into one regular expression.
// As in Perl, there's more than one way to do something in Java.
System.out.println("\nAn equivalent alternative.\n");
input.setCurrentOffset(input.getBeginOffset());
do {
if(matcher.matchesPrefix(input, patterns2)) {
MatchResult result = matcher.getMatch();
for(token = 1; token <= tokens.length; token++) {
if(result.group(token) != null) {
System.out.println(types[token - 1] + ": " + result);
break;
}
}
}
} while(matcher.contains(input, tokenSeparator));
}
}
