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