/*                        -*- Mode: java -*-                     */
/* Input file to JJTree and JavaCC to generate Matrix Parser */

options {
    LOOKAHEAD=1;
    STATIC = true;
    NODE_USES_PARSER = true;
}


PARSER_BEGIN(MatrixParser)

/* Parser for matrices written in matlab format.

 Copyright (c) 1998-2005 The Regents of the University of California.
 All rights reserved.
 Permission is hereby granted, without written agreement and without
 license or royalty fees, to use, copy, modify, and distribute this
 software and its documentation for any purpose, provided that the above
 copyright notice and the following two paragraphs appear in all copies
 of this software.

 IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
 FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
 ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
 THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF
 SUCH DAMAGE.

 THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE
 PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF
 CALIFORNIA HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
 ENHANCEMENTS, OR MODIFICATIONS.

                                        PT_COPYRIGHT_VERSION_2
                                        COPYRIGHTENDKEY
*/

package ptolemy.data.expr;

import ptolemy.kernel.util.IllegalActionException;

import java.util.Vector;
import java.io.ByteArrayInputStream;
import java.io.FileReader;

//////////////////////////////////////////////////////////////////////////
//// MatrixParser
/**
This Class provides a parser for read matrices in matlab format.

@author  Bart Kienhuis
@version $Id: MatrixParser.jjt,v 1.11 2005/02/28 19:08:41 cxh Exp $
@since Ptolemy II 1.0
@Pt.ProposedRating Red
@Pt.AcceptedRating Red (kienhuis)
*/
public class MatrixParser {

    /** Read a Matrix from File.
        @exception IllegalActionException If an error occurs during parsing.
    */
    public Vector readMatrix() throws IllegalActionException {
	Vector m = null;
	try {
	    m = matrix();
	} catch (Exception e) {
            throw new IllegalActionException(e.getMessage());
        }
	return m;
    }
}

PARSER_END(MatrixParser)

SKIP :
{
  " "
| "\t"
| "\n"
| "\r"
}


<DEFAULT> TOKEN : /* numeric constants */
{
	< CONSTANT: <FLOAT>
	    | <FLOAT> ( ["e","E"] ([ "-","+"])? <INTEGER> )?
    	>
  | 	< #FLOAT: <INTEGER>
	    | <INTEGER> ( "." <INTEGER> )?
	    | "." <INTEGER>
    	>
  | 	< #INTEGER: ( <DIGIT> )+ >
  | 	< #DIGIT: ["0" - "9"] >
}

<DEFAULT> TOKEN :
{
    < NAME     : ( ["a"-"z" , "A"-"Z" , "_"] )+ ( ["a"-"z" , "A"-"Z" , "_" , "'", "0"-"9"] )* >
 |  < NATURAL  : ( ["0"-"9"] )+ ( ["0"-"9"] )* >
 |  < SIGN     : ["-","+"] >
}


SPECIAL_TOKEN :
{
  < COMMENT : "#" (~["\n","\r"])* ["\n","\r"] >
}


Vector matrix() :
{
    Vector m = new Vector();;
    Vector row = null;
    //Matrix m;
    //Matrix row = null;
}
{  (
      "[" [row=row()]  {m.add(row);}
      (";"  row=row()  {m.add(row);} )* "]"
   )

   {
       return m;
   }
}

Vector row() :
{
  Vector row = new Vector();
  double element;
}
{  (   element=element()       {row.add(new Double(element));}
       ( "," element=element() {row.add(new Double(element));} )*
   )
   {
       return row;
   }
}


double element() :
{
  Token i;
  Token s;
  int sign = 1;
  double value;
}
{   (	[s=<SIGN> {if ( (s.image).equals("-") ) sign=-1*sign; }]
    	i=<CONSTANT> {value = sign*(new Double(i.image)).doubleValue();}
    )
    { return value; }
}