valentina/src/libs/qmuparser/qmutokenparser.cpp

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/***************************************************************************************************
**
** Copyright (C) 2015 Roman Telezhynskyi
**
** Permission is hereby granted, free of charge, to any person obtaining a copy of this
** software and associated documentation files (the "Software"), to deal in the Software
** without restriction, including without limitation the rights to use, copy, modify,
** merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
** permit persons to whom the Software is furnished to do so, subject to the following conditions:
**
** The above copyright notice and this permission notice shall be included in all copies or
** substantial portions of the Software.
**
** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
** NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
** NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
** DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
** OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
**
******************************************************************************************************/
#include "qmutokenparser.h"
#include <QMap>
#include <QStaticStringData>
#include <QStringData>
#include <QStringDataPtr>
#include "qmuparsererror.h"
namespace qmu
{
//---------------------------------------------------------------------------------------------------------------------
QmuTokenParser::QmuTokenParser()
{
InitCharSets();
setAllowSubexpressions(false);//Only one expression per time
}
//---------------------------------------------------------------------------------------------------------------------
/**
* @brief QmuTokenParser class constructor. Make easy initialization math parser.
*
* This constructor hide initialization variables, operators, character sets.
* Use this constuctor to get tokens from formula. All formulas must be converted to external look.
* Example:
*
* QmuTokenParser *cal = new QmuTokenParser(formula, osSeparator, false);
* tokens = cal->GetTokens();
* numbers = cal->GetNumbers();
* delete cal;
*
* @param formula string with formula.
* @param fromUser true if we parse formula from user
*/
QmuTokenParser::QmuTokenParser(const QString &formula, bool osSeparator, bool fromUser)
:QmuFormulaBase()
{
InitCharSets();
setAllowSubexpressions(false);//Only one expression per time
SetVarFactory(AddVariable, this);
SetSepForTr(osSeparator, fromUser);
SetExpr(formula);
//Need run for making tokens. Don't catch exception here, because we want know if formula has error.
Eval();
}
//---------------------------------------------------------------------------------------------------------------------
QmuTokenParser::~QmuTokenParser()
{
}
//---------------------------------------------------------------------------------------------------------------------
/**
* @brief IsSingle test formula and return true if it contain only one number.
*
* Work only with expressions in internal (C) locale.
* @param formula expression for test
* @return true if fomula has single number
*/
bool QmuTokenParser::IsSingle(const QString &formula)
{
if (formula.isEmpty())
{
return false;// if don't know say no
}
QScopedPointer<QmuTokenParser> cal(new QmuTokenParser());
// Parser doesn't know any variable on this stage. So, we just use variable factory that for each unknown
// variable set value to 0.
cal->SetVarFactory(AddVariable, cal.data());
cal->SetSepForEval();//Reset separators options
try
{
cal->SetExpr(formula);
cal->Eval();// We don't need save result, only parse formula
}
catch (const qmu::QmuParserError &e)
{
Q_UNUSED(e)
return false;// something wrong with formula, say no
}
QMap<int, QString> tokens = cal->GetTokens();// Tokens (variables, measurements)
const QMap<int, QString> numbers = cal->GetNumbers();// All numbers in expression
delete cal.take();
// Remove "-" from tokens list if exist. If don't do that unary minus operation will broken.
RemoveAll(tokens, QStringLiteral("-"));
if (tokens.isEmpty() && numbers.size() == 1)
{
return true;
}
else
{
return false;
}
}
}// namespace qmu