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The Berkeley parser analyzes the grammatical structure of natural language using probabilistic context-free grammars (PCFGs).

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/**
 * 
 */
package edu.berkeley.nlp.io;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;

/**
 * @author adpauls
 *
 */
public class PerlIOFuncs
{
	
	public enum ControlStatement { next,last,redo;}
	
	public static String chomp(String s)
	{
		String lineSep = System.getProperty("line.separator");
		if (s.endsWith(lineSep))
		{
			return s.substring(s.length() - lineSep.length());
		}
		else
		{
			return s;
		}
	}
	
	public static interface LineCallback
	{
		ControlStatement handleLine(String line);
	}
	
	public static void diamond(File file, LineCallback c)
	{
		try
		{
		BufferedReader r = new BufferedReader(new FileReader(file));
		String line = null;
		while ((line = r.readLine()) != null)
		{
			ControlStatement cont = c.handleLine(line);
			switch (cont)
			{
			case next: continue;
			case redo: continue;
			case last: break;
			}
		}
		}
		catch (IOException e)
		{
			throw new RuntimeException(e);
		}
		
	}
}