valentina_old/src/libs/vpatterndb/calculator.cpp

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/************************************************************************
**
** @file calculator.cpp
** @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) 2013-2015 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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#include "calculator.h"
#include <QDebug>
#include <QSettings>
#include "vcontainer.h"
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using namespace qmu;
//---------------------------------------------------------------------------------------------------------------------
/**
* @brief Calculator class wraper for QMuParser. Make easy initialization math parser.
*
* This constructor hide initialization variables, operators, character sets.
* Use this constuctor for evaluation formula. All formulas must be converted to internal look.
* Example:
*
* const QString formula = qApp->FormulaFromUser(edit->text());
* Calculator *cal = new Calculator(data, patternType);
* const qreal result = cal->EvalFormula(formula);
* delete cal;
*
* @param data pointer to a variable container.
*/
Calculator::Calculator(const VContainer *data, MeasurementsType patternType)
:QmuFormulaBase(), vVarVal(nullptr), data(data), patternType(patternType)
{
SCASSERT(data != nullptr)
InitCharacterSets();
setAllowSubexpressions(false);//Only one expression per time
SetSepForEval();
}
//---------------------------------------------------------------------------------------------------------------------
Calculator::~Calculator()
{
delete [] vVarVal;
}
//---------------------------------------------------------------------------------------------------------------------
/**
* @brief eval calculate formula.
*
* First we try eval expression without adding variables. If it fail, we take tokens from expression and add variables
* to parser and try again.
*
* @param formula string of formula.
* @return value of formula.
*/
qreal Calculator::EvalFormula(const QString &formula)
{
// Parser doesn't know any variable on this stage. So, we just use variable factory that for each unknown variable
// set value to 0.
SetVarFactory(AddVariable, this);
SetSepForEval();//Reset separators options
SetExpr(formula);
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qreal result = 0;
result = Eval();
QMap<int, QString> tokens = this->GetTokens();
// Remove "-" from tokens list if exist. If don't do that unary minus operation will broken.
RemoveAll(tokens, QStringLiteral("-"));
for (int i = 0; i < builInFunctions.size(); ++i)
{
if (tokens.isEmpty())
{
break;
}
RemoveAll(tokens, builInFunctions.at(i));
}
if (tokens.isEmpty())
{
return result; // We have found only numbers in expression.
}
// Add variables to parser because we have deal with expression with variables.
InitVariables(data, tokens, formula);
return Eval();
}
//---------------------------------------------------------------------------------------------------------------------
/**
* @brief Calculator::InitVariables add variables to parser.
*
* For optimization purpose we try don't add variables that we don't need.
*
* @param data pointer to a variable container. Hold all informations about variables.
* @param tokens all tokens (measurements names, variables with lengths) that parser have found in expression.
* @param formula expression, need for throwing better error message.
*/
void Calculator::InitVariables(const VContainer *data, const QMap<int, QString> &tokens, const QString &formula)
{
if (patternType == MeasurementsType::Standard)
{
vVarVal = new qreal[2]; //stabdard measurements table have two additional variables
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}
SCASSERT(data != nullptr)
const QHash<QString, QSharedPointer<VInternalVariable> > *vars = data->DataVariables();
QMap<int, QString>::const_iterator i = tokens.constBegin();
while (i != tokens.constEnd())
{
bool found = false;
if (vars->contains(i.value()))
{
QSharedPointer<VInternalVariable> var = vars->value(i.value());
if (patternType == MeasurementsType::Standard && var->GetType() == VarType::Measurement)
{
QSharedPointer<VVariable> m = data->GetVariable<VVariable>(i.value());
m->SetValue(data->size(), data->height(), *data->GetPatternUnit());
}
DefineVar(i.value(), var->GetValue());
found = true;
}
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if (patternType == MeasurementsType::Standard)
{
if (i.value() == data->SizeName())
{
vVarVal[0] = data->size();
DefineVar(data->SizeName(), &vVarVal[0]);
found = true;
}
if (i.value() == data->HeightName())
{
vVarVal[1] = data->height();
DefineVar(data->HeightName(), &vVarVal[1]);
found = true;
}
}
if (found == false)
{
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throw qmu::QmuParserError (ecUNASSIGNABLE_TOKEN, i.value(), formula, i.key());
}
++i;
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}
}
//---------------------------------------------------------------------------------------------------------------------
/**
* @brief Calculator::RemoveAll remove token from token list.
*
* Standard Qt class QMap doesn't have method RemoveAll.
* Example: remove "-" from tokens list if exist. If don't do that unary minus operation will broken.
*
* @param map map with tokens
* @param val token that need delete
*/
void Calculator::RemoveAll(QMap<int, QString> &map, const QString &val)
{
const QList<int> listKeys = map.keys(val);//Take all keys that contain token.
if (listKeys.size() > 0)
{
for (int i = 0; i < listKeys.size(); ++i)
{
map.remove(listKeys.at(i));
}
}
}