/* Copyright (C) 2005 LinBox
 * Written by Dan Roche
 *
 *
 *
 * ========LICENCE========
 * This file is part of the library LinBox.
 *
  * LinBox is free software: you can redistribute it and/or modify
 * it under the terms of the  GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * ========LICENCE========
 */

/*! @file util/formats/sms.h
 * @brief MatrixStreamReader for sms matrix format
 *
 * 1st line: "50 60 X" // #rows #cols a letter (e.g M, I, R, P ...)
 * Subsequent lines: i j v // row index, col index, value
 * last line: 0 0 0
 */

#ifndef __LINBOX_sms_H
#define __LINBOX_sms_H

#include <cstdlib>

/*
   namespace LinBox__SMS_H
{ static const char* name = "SMS Sparse Integer Matrix Format";
static const char* shortname = "sms"; }
*/

namespace LinBox
{

	template<class Field>
	class SMSReader : public MatrixStreamReader<Field> {
	public:
		typedef typename MatrixStreamReader<Field>::Element Element;
	private:
		int _base;

	protected:

		MatrixStreamError initImpl(const char* firstLine) {
			char* restLine;
			int i = 0;

			// Read m
			this->_m = strtoul(firstLine,&restLine,0);
			if( this->_m == 0 && restLine == firstLine )
				return NO_FORMAT;
			i = int(restLine - firstLine);

			// Read n
			this->_n = strtoul(firstLine+i,&restLine,0);
			if( this->_n == 0 && restLine == firstLine+i )
				return NO_FORMAT;
			i = int(restLine - firstLine);

			// Read "M" or "R" or "P" or "I"
			while( firstLine[i] && isspace(firstLine[i]) )
				++i;
			if( !firstLine[i] || (firstLine[i] != 'M' &&
					      firstLine[i] != 'm' &&
					      firstLine[i] != 'I' &&
					      firstLine[i] != 'i' &&
					      firstLine[i] != 'R' &&
					      firstLine[i] != 'r' &&
					      firstLine[i] != 'P' &&
					      firstLine[i] != 'p'   ) )
				return NO_FORMAT;

			// Check whitespace for rest of line
			++i;
			while( firstLine[i] && isspace(firstLine[i]) )
				++i;
			if( firstLine[i] ) return BAD_FORMAT;

			this->knowM = this->knowN = true;

			return GOOD;
		}

		MatrixStreamError nextTripleImpl( size_t& m, size_t& n, Element& v ) {
			this->ms->readWhiteSpace();
			*(this->sin) >> m;
			if( this->sin->eof() ) return END_OF_FILE;
			if( !this->sin->good() ) return BAD_FORMAT;

			this->ms->readWhiteSpace();
			*(this->sin) >> n;
			if( this->sin->eof() ) return END_OF_FILE;
			if( !this->sin->good() ) return BAD_FORMAT;

			this->ms->readWhiteSpace();
			if( this->sin->eof() ) return END_OF_FILE;
			this->ms->getField().read(*(this->sin),v);
			if( this->sin->eof() ) this->atEnd = true;
			else if( !this->sin->good() ) return BAD_FORMAT;

			if( m == 0 && n == 0 ) return END_OF_MATRIX;

			m -= _base;
			n -= _base;

			if( m >= this->_m ||
			    n >= this->_n ) return BAD_FORMAT;

			return GOOD;
		}

	public:
		SMSReader( int base = 1 ) {
			_base = base;
		}

		const char* getName() const {return "SMS Sparse Integer Matrix Format"; }//LinBox__SMS_H::name;}
		const char* shortName() const
		{ return "sms"; }//LinBox__SMS_H::shortname; }

		bool isSparse() const { return true; }
		};

}

#endif // __LINBOX_sms_H


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