/* Copyright (C) 2002 Univ. of Massachusetts Amherst, Computer Science Dept.
This file is part of "MALLET" (MAchine Learning for LanguagE Toolkit).
http://www.cs.umass.edu/~mccallum/mallet
This software is provided under the terms of the Common Public License,
version 1.0, as published by http://www.opensource.org. For further
information, see the file `LICENSE' included with this distribution. */
/**
Count the number of times the provided regular expression matches
the token text, and add a feature with the provided name having
value equal to the count.
@author Andrew McCallum <a href="mailto:mccallum@cs.umass.edu">mccallum@cs.umass.edu</a>
*/
package cc.mallet.pipe.tsf;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
import java.util.logging.*;
import cc.mallet.pipe.*;
import cc.mallet.types.*;
import cc.mallet.util.MalletLogger;
public class CountMatchesMatching extends Pipe
{
private static Logger logger = MalletLogger.getLogger(CountMatchesMatching.class.getName());
String feature;
Pattern regex;
Pattern moreSpecificRegex;
boolean normalizeByRegexMatches = false;
public CountMatchesMatching (String featureName,
Pattern regex, Pattern moreSpecificRegex,
boolean normalizeByRegexMatches)
{
this.feature = featureName;
this.regex = regex;
this.moreSpecificRegex = regex;
this.normalizeByRegexMatches = normalizeByRegexMatches;
}
public CountMatchesMatching (String featureName, Pattern regex, Pattern moreSpecificRegex)
{
this (featureName, regex, moreSpecificRegex, false);
}
public Instance pipe (Instance carrier)
{
TokenSequence ts = (TokenSequence) carrier.getData();
int count;
int moreSpecificCount;
for (int i = 0; i < ts.size(); i++) {
count = 0;
moreSpecificCount = 0;
Token t = ts.get(i);
Matcher matcher = regex.matcher (t.getText());
while (matcher.find()) {
count++;
logger.info ("CountMatchesMatching found >"+matcher.group()+"<");
Matcher moreSpecificMatcher = moreSpecificRegex.matcher (t.getText().substring(matcher.start()));
if (moreSpecificMatcher.lookingAt ()) {
moreSpecificCount++;
logger.info ("CountMatchesMatching sound >"+moreSpecificMatcher.group()+"<");
}
}
if (moreSpecificCount > 0)
t.setFeatureValue (feature, (normalizeByRegexMatches
? ((double)moreSpecificCount)/count
: moreSpecificCount));
}
return carrier;
}
}