369 lines
7.6 KiB
C++
369 lines
7.6 KiB
C++
/************************************************************************
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**
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** @file calculator.cpp
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** @author Roman Telezhinsky <dismine@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 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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#define DELIMITER 1
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#define VARIABLE 2
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#define NUMBER 3
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#define COMMAND 4
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#define STRING 5
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#define QUOTE 6
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#define FINISHED 10
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#define EOL 9
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qreal Calculator::eval(QString prog, QString *errorMsg)
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{
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this->errorMsg = errorMsg;
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this->errorMsg->clear();
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debugFormula.clear();
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this->prog = prog;
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//qDebug()<<"Formula: "<<prog;
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index = 0;
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qreal result = get_exp();
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QString str = QString(" = %1").arg(result, 0, 'f', 3);
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debugFormula.append(str);
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//qDebug()<<"Result:"<<debugFormula;
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return result;
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}
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qreal Calculator::get_exp()
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{
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qreal result = 0;
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get_token();
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if (token.isEmpty())
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{
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serror(2);
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return 0;
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}
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level2(&result);
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putback();
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return result;
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}
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void Calculator::level2(qreal *result)
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{
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QChar op;
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qreal hold;
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level3(result);
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while ((op=token[0]) == '+' || op == '-')
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{
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get_token();
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level3(&hold);
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arith(op, result, &hold);
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}
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}
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void Calculator::level3(qreal *result)
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{
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QChar op;
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qreal hold;
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level4(result);
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while ((op = token[0]) == '*' || op == '/' || op == '%')
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{
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get_token();
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level4(&hold);
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arith(op, result, &hold);
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}
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}
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void Calculator::level4(qreal *result)
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{
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qreal hold;
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level5(result);
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if (token[0] == '^')
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{
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get_token();
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level4(&hold);
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arith('^', result, &hold);
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}
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}
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void Calculator::level5(qreal *result)
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{
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QChar op;
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op = '\0';
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if ((token_type==DELIMITER) && (token[0]=='+' || token[0]=='-'))
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{
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op = token[0];
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get_token();
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}
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level6(result);
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if (op != '\0')
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{
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unary(op, result);
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}
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}
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void Calculator::level6(qreal *result)
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{
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if ((token[0] == '(') && (token_type == DELIMITER))
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{
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get_token();
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level2(result);
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if (token[0] != ')')
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{
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serror(1);
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}
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get_token();
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} else
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primitive(result);
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}
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void Calculator::primitive(qreal *result)
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{
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QString str;
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switch (token_type)
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{
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case VARIABLE:
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*result = find_var(token);
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str = QString("%1").arg(*result, 0, 'f', 3);
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debugFormula.append(str);
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get_token();
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return;
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case NUMBER:
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*result = token.toDouble();
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str = QString("%1").arg(*result, 0, 'f', 3);
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debugFormula.append(str);
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get_token();
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return;
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default:
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serror(0);
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}
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}
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void Calculator::arith(QChar o, qreal *r, qreal *h)
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{
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qreal t;//, ex;
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switch (o.toLatin1())
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{
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case '-':
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*r = *r-*h;
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break;
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case '+':
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*r = *r+*h;
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break;
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case '*':
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*r = *r * *h;
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break;
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case '/':
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*r = (*r)/(*h);
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break;
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case '%':
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t = (*r)/(*h);
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*r = *r-(t*(*h));
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break;
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case '^':
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*r = pow(*r, *h);
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break;
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default:
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break;
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}
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}
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void Calculator::unary(QChar o, qreal *r)
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{
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if (o=='-')
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{
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*r = -(*r);
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}
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}
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qreal Calculator::find_var(QString s)
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{
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bool ok = false;
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qreal value = data->FindVar(s, &ok);
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if (ok == false)
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{
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qDebug()<<s;
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serror(4); /* don't variable */
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return 0;
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}
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return value;
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}
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void Calculator::serror(qint32 error)
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{
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QString e[]=
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{
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"Синтаксическая ошибка",
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"Непарные круглые скобки",
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"Это не выражение",
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"Предполагается символ равенства",
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"Не переменная"
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};
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errorMsg->clear();
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*errorMsg = e[error];
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qDebug()<<e[error];
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}
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char Calculator::look_up(QString s)
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{
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QString p;
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p = s;
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p = p.toLower();
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return 0;
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}
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bool Calculator::isdelim(QChar c)
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{
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if (StrChr(" ;,+-<>/*%^=()", c) || c=='\n' || c=='\r' || c=='\0')
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{
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return true;
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}
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return false;
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}
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bool Calculator::iswhite(QChar c)
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{
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if (c==' ' || c=='\t')
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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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void Calculator::get_token()
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{
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QString *temp;
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token_type=0; tok=0;
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token.clear();
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temp=&token;
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if (prog[index]=='\0')
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{ /* end of file */
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token="\0";
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tok=FINISHED;
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token_type=DELIMITER;
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return;
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}
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while (iswhite(prog[index]))
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{
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++index; /* skip spaces */
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}
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if (prog[index]=='\r')
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{ /* crtl */
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++index; ++index;
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tok= EOL; token='\r';
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token.append('\n');token.append("\0");
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token_type = DELIMITER;
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return;
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}
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if (StrChr("+-*^/%=;(),><", prog[index]))
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{ /* delimiter */
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*temp=prog[index];
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index++; /* jump to the next position */
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temp->append("\0");
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token_type=DELIMITER;
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debugFormula.append(token);
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return;
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}
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if (prog[index]=='"')
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{ /* quoted string */
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index++;
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while (prog[index] != '"' && prog[index] != '\r')
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{
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temp->append(prog[index]);
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index++;
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}
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if (prog[index]=='\r')
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{
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serror(1);
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}
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index++;temp->append("\0");
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token_type=QUOTE;
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return;
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}
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if (prog[index].isDigit())
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{ /* number */
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while (isdelim(prog[index]) == false)
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{
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temp->append(prog[index]);
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index++;
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}
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temp->append('\0');
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token_type = NUMBER;
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return;
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}
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if (prog[index].isPrint())
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{ /* variable or command */
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while (isdelim(prog[index]) == false)
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{
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temp->append(prog[index]);
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index++;
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}
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token_type=STRING;
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}
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temp->append("\0");
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/* Seen if there is a command line or a variable */
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if (token_type==STRING)
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{
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tok=look_up(token);
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if (tok == false)
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{
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token_type = VARIABLE;
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}
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else
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{
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token_type = COMMAND; /* It is command */
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}
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}
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return;
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}
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bool Calculator::StrChr(QString string, QChar c)
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{
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return string.contains(c, Qt::CaseInsensitive);
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}
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void Calculator::putback()
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{
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QString t;
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t = token;
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index = index - t.size();
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}
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