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/*
* $Id: streamInputExample.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.awk;
import java.io.*;
import org.apache.oro.text.regex.*;
import org.apache.oro.text.awk.*;
/**
* This is a test program demonstrating how to search an input stream
* with the AwkTools regular expression classes.
*
* @version @version@
*/
public final class streamInputExample {
/**
* This program extracts sentences containing the word C++ from
* the sample file streamInputExample.txt The regular expression
* used is not perfect, so focus on AwkStreamInput and not the
* ability of the regular expression to handle all normal sentences.
* For those not familiar with the OROMatcher Util class, a use of
* the Util.substitute method is included.
*/
public static final void main(String args[]) {
// A regular expression to extract sentences containing the word C++.
// We assume sentences can only end in . ! ? and start with a word
// character \w
String regex = "(\\w[^\\.?!]*C\\+\\+|C\\+\\+)[^\\.?!]*[\\.?!]";
String sentence;
AwkMatcher matcher;
AwkCompiler compiler;
Pattern pattern = null, newline = null;
AwkStreamInput input;
MatchResult result;
Reader file = null;
// Create AwkCompiler and AwkMatcher instances.
compiler = new AwkCompiler();
matcher = new AwkMatcher();
// Attempt to compile the pattern. If the pattern is not valid,
// report the error and exit.
try {
pattern
= compiler.compile(regex, AwkCompiler.CASE_INSENSITIVE_MASK);
// Compile a pattern representing a string of newlines with other
// whitespace stuck around the newlines
newline = compiler.compile("(\\s*[\n\r]\\s*)+");
} catch(MalformedPatternException e) {
System.err.println("Bad pattern.");
System.err.println(e.getMessage());
System.exit(1);
}
// Open input file.
try {
file = new FileReader("streamInputExample.txt");
} catch(IOException e) {
System.err.println("Error opening streamInputExample.txt.");
System.err.println(e.getMessage());
System.exit(1);
}
// Create an AwkStreamInput instance to search the input stream.
input = new AwkStreamInput(file);
// We need to put the search loop in a try block because when searching
// an AwkStreamInput instance, an IOException may occur, and it must be
// caught.
try {
// Loop until there are no more matches left.
while(matcher.contains(input, pattern)) {
// Since we're still in the loop, fetch match that was found.
result = matcher.getMatch();
// Substitute all newlines in the match with spaces.
sentence = Util.substitute(matcher, newline,
new StringSubstitution(" "),
result.toString(), Util.SUBSTITUTE_ALL);
System.out.println("\nMatch:\n" + sentence);
}
} catch(IOException e) {
System.err.println("Error occurred while reading file.");
System.err.println(e.getMessage());
System.exit(1);
}
}
}
