/* 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. */
/**
@author Andrew McCallum <a href="mailto:mccallum@cs.umass.edu">mccallum@cs.umass.edu</a>
*/
package cc.mallet.pipe;
import java.io.*;
import java.net.URI;
import java.util.regex.Pattern;
import cc.mallet.extract.StringSpan;
import cc.mallet.extract.StringTokenization;
import cc.mallet.types.Instance;
import cc.mallet.types.SingleInstanceIterator;
import cc.mallet.types.Token;
import cc.mallet.types.TokenSequence;
import cc.mallet.util.CharSequenceLexer;
import cc.mallet.util.Lexer;
/**
* Pipe that tokenizes a character sequence. Expects a CharSequence
* in the Instance data, and converts the sequence into a token
* sequence using the given regex or CharSequenceLexer.
* (The regex / lexer should specify what counts as a token.)
*/
public class CharSequence2TokenSequence extends Pipe implements Serializable
{
CharSequenceLexer lexer;
public CharSequence2TokenSequence (CharSequenceLexer lexer)
{
this.lexer = lexer;
}
public CharSequence2TokenSequence (String regex)
{
this.lexer = new CharSequenceLexer (regex);
}
public CharSequence2TokenSequence (Pattern regex)
{
this.lexer = new CharSequenceLexer (regex);
}
public CharSequence2TokenSequence ()
{
this (new CharSequenceLexer());
}
public Instance pipe (Instance carrier)
{
CharSequence string = (CharSequence) carrier.getData();
lexer.setCharSequence (string);
TokenSequence ts = new StringTokenization (string);
while (lexer.hasNext()) {
lexer.next();
ts.add (new StringSpan (string, lexer.getStartOffset (), lexer.getEndOffset ()));
}
carrier.setData(ts);
return carrier;
}
public static void main (String[] args)
{
try {
for (int i = 0; i < args.length; i++) {
Instance carrier = new Instance (new File(args[i]), null, null, null);
SerialPipes p = new SerialPipes (new Pipe[] {
new Input2CharSequence (),
new CharSequence2TokenSequence(new CharSequenceLexer())});
carrier = p.newIteratorFrom (new SingleInstanceIterator(carrier)).next();
TokenSequence ts = (TokenSequence) carrier.getData();
System.out.println ("===");
System.out.println (args[i]);
System.out.println (ts.toString());
}
} catch (Exception e) {
System.out.println (e);
e.printStackTrace();
}
}
// Serialization
private static final long serialVersionUID = 1;
private static final int CURRENT_SERIAL_VERSION = 0;
private void writeObject (ObjectOutputStream out) throws IOException {
out.writeInt(CURRENT_SERIAL_VERSION);
out.writeObject(lexer);
}
private void readObject (ObjectInputStream in) throws IOException, ClassNotFoundException {
int version = in.readInt ();
lexer = (CharSequenceLexer) in.readObject();
}
}