119 lines
4.0 KiB
C++
119 lines
4.0 KiB
C++
/************************************************************************
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**
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** @file calculator.cpp
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** @author Roman Telezhynskyi <dismine(at)gmail.com>
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** @date November 15, 2013
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**
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** @brief
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** @copyright
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** This source code is part of the Valentina project, a pattern making
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** program, whose allow create and modeling patterns of clothing.
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** Copyright (C) 2013-2015 Valentina project
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** <https://bitbucket.org/dismine/valentina> All Rights Reserved.
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**
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** Valentina is free software: you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation, either version 3 of the License, or
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** (at your option) any later version.
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**
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** Valentina is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with Valentina. If not, see <http://www.gnu.org/licenses/>.
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**
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*************************************************************************/
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#include "calculator.h"
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#include <QStaticStringData>
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#include <QStringData>
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#include <QStringDataPtr>
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#include <QStringList>
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#include <QSharedPointer>
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#include "../vmisc/def.h"
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#include "../qmuparser/qmuparsererror.h"
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#include "variables/vinternalvariable.h"
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//---------------------------------------------------------------------------------------------------------------------
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/**
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* @brief Calculator class wraper for QMuParser. Make easy initialization math parser.
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*
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* This constructor hide initialization variables, operators, character sets.
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* Use this constuctor for evaluation formula. All formulas must be converted to internal look.
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* Example:
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*
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* const QString formula = qApp->FormulaFromUser(edit->text());
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* Calculator *cal = new Calculator(data, patternType);
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* const qreal result = cal->EvalFormula(data->PlainVariables(), formula);
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* delete cal;
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*
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*/
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Calculator::Calculator()
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: QmuFormulaBase(),
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m_varsValues(),
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m_vars(nullptr)
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{
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InitCharSets();
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// Parser doesn't know any variable on this stage. So, we just use variable factory that for each unknown variable
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// set value to 0.
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SetVarFactory(VarFactory, this);
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SetSepForEval();
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}
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//---------------------------------------------------------------------------------------------------------------------
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/**
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* @brief eval calculate formula.
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*
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* First we try eval expression without adding variables. If it fail, we take tokens from expression and add variables
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* to parser and try again.
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*
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* @param formula string of formula.
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* @return value of formula.
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*/
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qreal Calculator::EvalFormula(const QHash<QString, QSharedPointer<VInternalVariable>> *vars, const QString &formula)
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{
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// Converting with locale is much faster in case of single numerical value.
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QLocale c(QLocale::C);
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bool ok = false;
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qreal result = c.toDouble(formula, &ok);
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if (ok)
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{
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return result;
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}
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SetSepForEval();//Reset separators options
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m_vars = vars;
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SetExpr(formula);
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m_pTokenReader->IgnoreUndefVar(true);
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return Eval();
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}
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//---------------------------------------------------------------------------------------------------------------------
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qreal *Calculator::VarFactory(const QString &a_szName, void *a_pUserData)
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{
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Q_UNUSED(a_szName)
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Calculator *calc = static_cast<Calculator *>(a_pUserData);
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if (calc->m_vars != nullptr && calc->m_vars->contains(a_szName))
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{
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QSharedPointer<qreal> val(new qreal(*calc->m_vars->value(a_szName)->GetValue()));
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calc->m_varsValues.append(val);
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return val.data();
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}
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if (a_szName.startsWith('#'))
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{
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QSharedPointer<qreal> val(new qreal(0));
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calc->m_varsValues.append(val);
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return val.data();
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}
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throw qmu::QmuParserError (qmu::ecUNASSIGNABLE_TOKEN);
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}
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