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/*
* $Id: grep.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 java.io.*;
import java.util.*;
import org.apache.oro.text.*;
import org.apache.oro.text.regex.*;
/**
* This is a no-frills implementation of grep using Perl regular expressions.
* You can easily add most of the options present in most grep versions by
* creating a MatchAction class or classes whose behavior varies based on
* the provided flags.
*
* @version @version@
*/
public final class grep {
static int _file = 0;
// args[] is declared final so that Inner Class may reference it.
public static final void main(final String[] args) {
MatchActionProcessor processor = new MatchActionProcessor();
if(args.length < 2) {
System.err.println("Usage: grep ");
System.exit(1);
}
try {
if(args.length > 2) {
// Print filename before line if more than one file is specified.
// Rely on _file to point to current file being processed.
processor.addAction(args[0], new MatchAction() {
public void processMatch(MatchActionInfo info) {
info.output.println(args[_file] + ":" + info.line);
}
});
} else {
// We rely on the default action of printing matched
// lines to the given OutputStream
processor.addAction(args[0]);
}
} catch(MalformedPatternException e) {
System.err.println("Bad pattern.");
e.printStackTrace();
System.exit(1);
}
for(_file = 1; _file < args.length; _file++) {
try {
processor.processMatches(new FileInputStream(args[_file]), System.out);
} catch(IOException e) {
System.err.println("Error opening or reading " + args[_file]);
e.printStackTrace();
System.exit(1);
}
}
}
}
