import java.util.*;
import java.io.*;

public class GrammarReader {
	static String TAB="\t";
	BufferedReader fr = null;
	String line="";
	String sourceData ="";
	String targetData ="";
 	public Hashtable lex = new Hashtable();
	String errMsg ="";
	String grammar_file_name = ""; 

	//class constructor
	public GrammarReader(String gramfile){
		grammar_file_name = gramfile;

	}

	//function to read the lexicon data and store it in a hashtable
	public Hashtable getForms(){
		StringTokenizer st = null;
		errMsg = "";
		try {
			
			fr = new BufferedReader( new FileReader(grammar_file_name) );

			while ( ( line = fr.readLine() ) != null ) {
				sourceData = "";
				targetData  = "";
				
				st = new StringTokenizer(line, "=");
			
				if( st.hasMoreTokens() ) {
					sourceData = st.nextToken();
				}
				if( st.hasMoreTokens() ) {
					targetData = st.nextToken();
				}

				lex.put(sourceData, targetData);

        		}//WHILE
		}
		catch (Exception ex) {
			errMsg = "error in reading file... " + ex.toString() ;
			try {
				fr.close();
			}
			catch (Exception cl) {
			}
			System.out.println(errMsg);	
		}
		
		return lex;
	}
}