ttcalc/src/parsermanager.h

/*
 * This file is a part of TTCalc - a mathematical calculator
 * and is distributed under the (new) BSD licence.
 * Author: Tomasz Sowa <t.sowa@slimaczek.pl>
 */

/* 
 * Copyright (c) 2006-2007, Tomasz Sowa
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 *  * Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *    
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *    
 *  * Neither the name Tomasz Sowa nor the names of contributors to this
 *    project may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef headerfilecalculation
#define headerfilecalculation

/*!
	\file parsermanager.h
    \brief object of type ParserManager we're using during calculating
*/

#include "resource.h"
#include <ttmath/ttmathparser.h>
#include "programresources.h"

#include <windows.h>


/*!
	\brief object of type ParserManager we're using during calculating

	In our program we're using three kind of precisions. First is the smallest
	, and the third is the biggest. Because precision is established during
	compilation (templates) we need three different objects. ParserManager
	helps us to maintain these objects.
*/
class ParserManager
{
public:

	ParserManager();
	ParserManager(const ParserManager & p);
	ParserManager & operator=(const ParserManager & p);
	~ParserManager();


	/*!
		the main method which call parserX.Parse(...)
	*/
	ttmath::ErrorCode Parse();
	

	/*
		it returns the last error code which was during parsing	
	*/
	ttmath::ErrorCode GetLastCode();


	/*!
		we call this method directly after when we have left
		WaitForCalculatingAndBlockForStop() method from the ThreadController

		only in this method we can read variables which can be changed
		by the first thread
	*/
	void MakeCopyOfVariables();


	/*!
		it prepares our three parsers to work, it should be called only once
	*/
	void Init();


	/*!
		this method prints result
		(a correct value if was or an error instead)
	*/
	void PrintResult();


private:

	ttmath::Parser<ttmath::Big<1,3> > parser1;
	ttmath::Parser<ttmath::Big<2,6> > parser2;
	ttmath::Parser<ttmath::Big<3,9> > parser3;

	ttmath::Objects variables, functions;

	const unsigned int buffer_len;
	char * buffer;

	int base_input, base_output;

	bool always_scientific;
	int when_scientific;
	int rounding;
	int precision;
	Languages::Country country;
	ttmath::ErrorCode code;


	template<class ValueType>
	void PrintResult(ttmath::Parser<ValueType> & matparser)
	{
	std::string result, part;
	unsigned int i = 0;


		for(i=0 ; i<matparser.stack.size() ; ++i)
		{

			try
			{
				if( matparser.stack[i].value.ToString(part,base_output, always_scientific, when_scientific, rounding) )
				{
					// we shouldn't have this error in the new version of ToStrign(...)
					// (it could be if were using very big mantissa and exponent
					// in the Big type)

					//
					// look at this: part.erase()
					//
					// we're using it because it's something wrong on gcc
					// when we're compiling with -O3 optimization flag
					//
					// gcc version 3.4.2 (mingw-special) with -O3
					// program tell us if there was an error here (from ToString())
					// but in fact it shouldn't have been here
					// I don't know where is the problem (I think in optimization, 
					// with -O1 and -O2 program works well and visual express works perfectly
					// as well)
					
					part.erase();

					// we can omit this part.erase() and use operator+= instead of 
					// operator= below, for example:
					// part += GetPrgRes()->GetLanguages()->GuiMessage(country, Languages::overflow_during_printing);
					// will be working correctly on gcc with -O3

					// this error doesn't appear always, it can be seen, for example,
					// if we use Big<1,3> type and we give '2^32' for calculating

					// I didn't check this error on a new version of gcc

					part = GetPrgRes()->GetLanguages()->GuiMessage(country, Languages::overflow_during_printing);
				}
			}
			catch(...)
			{
				part.erase();
				part = GetPrgRes()->GetLanguages()->ErrorMessage(country, ttmath::err_internal_error);
			}

			result += part;

			if( i < matparser.stack.size()-1 )
				result += "    ";
		}

		SetDlgItemText(GetPrgRes()->GetMainWindow(),IDC_OUTPUT_EDIT,result.c_str());
	}


};




#endif