valentina/src/app/container/calculator.h

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/************************************************************************
**
** @file calculator.h
** @author Roman Telezhynskyi <dismine(at)gmail.com>
** @date November 15, 2013
**
** @brief
** @copyright
** This source code is part of the Valentine project, a pattern making
** program, whose allow create and modeling patterns of clothing.
** Copyright (C) 2013 Valentina project
** <https://bitbucket.org/dismine/valentina> All Rights Reserved.
**
** Valentina is free software: you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation, either version 3 of the License, or
** (at your option) any later version.
**
** Valentina 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 General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with Valentina. If not, see <http://www.gnu.org/licenses/>.
**
*************************************************************************/
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#ifndef CALCULATOR_H
#define CALCULATOR_H
#include "vcontainer.h"
/**
* @brief The Calculator class calculate formulas of pattern. Support operation +,-,/,* and braces.
* Can replace name of variables her value.
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*/
class Calculator
{
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public:
/**
* @brief Calculator class constructor.
* @param data pointer to a variable container.
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*/
explicit Calculator(const VContainer *data):errorMsg(nullptr), token(QString()), tok(0), token_type(0),
prog(QString()), index(0), data(data), debugFormula(QString()){}
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/**
* @brief eval calculate formula.
* @param prog string of formula.
* @param errorMsg keep error message.
* @return value of formula.
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*/
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qreal eval(QString prog, QString *errorMsg);
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private:
Q_DISABLE_COPY(Calculator)
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/**
* @brief errorMsg keeps error message of calculation.
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*/
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QString *errorMsg;
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/**
* @brief token теперішня лексема.
*/
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QString token;
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/**
* @brief tok internal representation of token.
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*/
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qint32 tok;
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/**
* @brief token_type type of token.
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*/
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qint32 token_type;
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/**
* @brief prog string where keeps formula.
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*/
QString prog;
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/**
* @brief index number character in string of formula.
*/
qint32 index;
/**
* @brief data container with data container of all variables.
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*/
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const VContainer *data;
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/**
* @brief debugFormula decoded string of formula.
*/
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QString debugFormula;
/**
* @brief get_exp calculate formula.
* @return value of formula.
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*/
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qreal get_exp();
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/**
* @brief get_token return next token.
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*/
void get_token();
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/**
* @brief StrChr checks whether the character belongs to the line.
* @param string string with formula
* @param c character.
* @return true - belongs to the line, false - don't belongs to the line.
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*/
static bool StrChr(QString string, QChar c);
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/**
* @brief putback returns the readout token back into the flow.
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*/
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void putback();
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/**
* @brief level2 method of addition and subtraction of two terms.
* @param result result of operation.
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*/
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void level2(qreal *result);
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/**
* @brief level3 method of multiplication, division, finding percent.
* @param result result of operation.
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*/
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void level3(qreal *result);
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/**
* @brief level4 method of degree two numbers.
* @param result result of operation.
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*/
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void level4(qreal *result);
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/**
* @brief level5 method for finding unary plus or minus.
* @param result result of operation.
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*/
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void level5(qreal *result);
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/**
* @brief level6 processing method of the expression in brackets.
* @param result result of operation.
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*/
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void level6(qreal *result);
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/**
* @brief primitive method of determining the value of a variable by its name.
* @param result result of operation.
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*/
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void primitive(qreal *result);
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/**
* @brief arith perform the specified arithmetic. The result is written to the first element.
* @param o sign of operation.
* @param r first element.
* @param h second element.
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*/
static void arith(QChar o, qreal *r, qreal *h);
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/**
* @brief unary method changes the sign.
* @param o sign of symbol.
* @param r element.
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*/
static void unary(QChar o, qreal *r);
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/**
* @brief find_var method is finding variable by name.
* @param s name of variable.
* @return value of variable.
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*/
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qreal find_var(QString s);
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/**
* @brief serror report an error
* @param error error code
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*/
// cppcheck-suppress functionStatic
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void serror(qint32 error);
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/**
* @brief look_up finding the internal format for the current token in the token table.
* @param s name of token.
* @return internal number of token.
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*/
static char look_up(QString s);
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/**
* @brief isdelim return true if c delimiter.
* @param c character.
* @return true - delimiter, false - do not delimiter.
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*/
static bool isdelim(QChar c);
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/**
* @brief isdelim return true if c delimiter.
* @param c character.
* @return true - delimiter, false - do not delimiter.
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*/
static bool iswhite(QChar c);
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/**
* @brief iswhite checks whether c space or tab.
* @param c character.
* @return true - space or tab, false - don't space and don't tab.
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*/
};
#endif // CALCULATOR_H