145 lines
4.8 KiB
C++
145 lines
4.8 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 Valentine 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 <QDebug>
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#include <QSettings>
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#include "vcontainer.h"
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using namespace qmu;
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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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{
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InitCharacterSets();
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setAllowSubexpressions(false);//Only one expression per time
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SetSepForEval();
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}
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//---------------------------------------------------------------------------------------------------------------------
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Calculator::~Calculator()
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{
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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, qreal *> &vars, const QString &formula)
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{
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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(AddVariable, this);
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SetSepForEval();//Reset separators options
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SetExpr(formula);
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qreal result = 0;
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result = Eval();
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QMap<int, QString> tokens = this->GetTokens();
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// Remove "-" from tokens list if exist. If don't do that unary minus operation will broken.
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RemoveAll(tokens, QStringLiteral("-"));
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for (int i = 0; i < builInFunctions.size(); ++i)
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{
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if (tokens.isEmpty())
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{
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break;
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}
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RemoveAll(tokens, builInFunctions.at(i));
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}
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if (tokens.isEmpty())
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{
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return result; // We have found only numbers in expression.
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}
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// Add variables to parser because we have deal with expression with variables.
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InitVariables(vars, tokens, formula);
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return Eval();
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}
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//---------------------------------------------------------------------------------------------------------------------
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/**
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* @brief Calculator::InitVariables add variables to parser.
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*
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* For optimization purpose we try don't add variables that we don't need.
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*
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* @param vars list of variables.
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* @param tokens all tokens (measurements names, variables with lengths) that parser have found in expression.
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* @param formula expression, need for throwing better error message.
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*/
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void Calculator::InitVariables(const QHash<QString, qreal *> &vars, const QMap<int, QString> &tokens,
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const QString &formula)
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{
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QMap<int, QString>::const_iterator i = tokens.constBegin();
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while (i != tokens.constEnd())
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{
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bool found = false;
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if (vars.contains(i.value()))
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{
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DefineVar(i.value(), vars.value(i.value()));
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found = true;
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}
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if (found == false && builInFunctions.contains(i.value()))
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{// We have found built-in function
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found = true;
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}
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if (found == false)
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{
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throw qmu::QmuParserError (ecUNASSIGNABLE_TOKEN, i.value(), formula, i.key());
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}
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++i;
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}
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}
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