mirror of
https://gitlab.com/smart-pattern/valentina.git
synced 2024-07-02 17:18:12 +02:00
369 lines
7.6 KiB
C++
369 lines
7.6 KiB
C++
/************************************************************************
|
||
**
|
||
** @file calculator.cpp
|
||
** @author Roman Telezhinsky <dismine@gmail.com>
|
||
** @date November 15, 2013
|
||
**
|
||
** @brief
|
||
** @copyright
|
||
** This source code is part of the Valentine project, a pattern making
|
||
** program, whose allow create and modeling patterns of clothing.
|
||
** Copyright (C) 2013 Valentina project
|
||
** <https://bitbucket.org/dismine/valentina> All Rights Reserved.
|
||
**
|
||
** Valentina is free software: you can redistribute it and/or modify
|
||
** it under the terms of the GNU General Public License as published by
|
||
** the Free Software Foundation, either version 3 of the License, or
|
||
** (at your option) any later version.
|
||
**
|
||
** Valentina is distributed in the hope that it will be useful,
|
||
** but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
** GNU General Public License for more details.
|
||
**
|
||
** You should have received a copy of the GNU General Public License
|
||
** along with Valentina. If not, see <http://www.gnu.org/licenses/>.
|
||
**
|
||
*************************************************************************/
|
||
|
||
#include "calculator.h"
|
||
#include <QDebug>
|
||
|
||
#define DELIMITER 1
|
||
#define VARIABLE 2
|
||
#define NUMBER 3
|
||
#define COMMAND 4
|
||
#define STRING 5
|
||
#define QUOTE 6
|
||
#define FINISHED 10
|
||
#define EOL 9
|
||
|
||
qreal Calculator::eval(QString prog, QString *errorMsg)
|
||
{
|
||
this->errorMsg = errorMsg;
|
||
this->errorMsg->clear();
|
||
debugFormula.clear();
|
||
this->prog = prog;
|
||
//qDebug()<<"Formula: "<<prog;
|
||
index = 0;
|
||
qreal result = get_exp();
|
||
QString str = QString(" = %1").arg(result, 0, 'f', 3);
|
||
debugFormula.append(str);
|
||
//qDebug()<<"Result:"<<debugFormula;
|
||
return result;
|
||
}
|
||
|
||
qreal Calculator::get_exp()
|
||
{
|
||
qreal result = 0;
|
||
get_token();
|
||
if (token.isEmpty())
|
||
{
|
||
serror(2);
|
||
return 0;
|
||
}
|
||
level2(&result);
|
||
putback();
|
||
return result;
|
||
}
|
||
|
||
|
||
void Calculator::level2(qreal *result)
|
||
{
|
||
QChar op;
|
||
qreal hold;
|
||
|
||
level3(result);
|
||
while ((op=token[0]) == '+' || op == '-')
|
||
{
|
||
get_token();
|
||
level3(&hold);
|
||
arith(op, result, &hold);
|
||
}
|
||
}
|
||
|
||
void Calculator::level3(qreal *result)
|
||
{
|
||
QChar op;
|
||
qreal hold;
|
||
|
||
level4(result);
|
||
|
||
while ((op = token[0]) == '*' || op == '/' || op == '%')
|
||
{
|
||
get_token();
|
||
level4(&hold);
|
||
arith(op, result, &hold);
|
||
}
|
||
}
|
||
|
||
void Calculator::level4(qreal *result)
|
||
{
|
||
qreal hold;
|
||
|
||
level5(result);
|
||
if (token[0] == '^')
|
||
{
|
||
get_token();
|
||
level4(&hold);
|
||
arith('^', result, &hold);
|
||
}
|
||
}
|
||
|
||
void Calculator::level5(qreal *result)
|
||
{
|
||
QChar op;
|
||
|
||
op = '\0';
|
||
if ((token_type==DELIMITER) && (token[0]=='+' || token[0]=='-'))
|
||
{
|
||
op = token[0];
|
||
get_token();
|
||
}
|
||
level6(result);
|
||
if (op != '\0')
|
||
{
|
||
unary(op, result);
|
||
}
|
||
}
|
||
|
||
void Calculator::level6(qreal *result)
|
||
{
|
||
if ((token[0] == '(') && (token_type == DELIMITER))
|
||
{
|
||
get_token();
|
||
level2(result);
|
||
if (token[0] != ')')
|
||
{
|
||
serror(1);
|
||
}
|
||
get_token();
|
||
} else
|
||
primitive(result);
|
||
}
|
||
|
||
void Calculator::primitive(qreal *result)
|
||
{
|
||
QString str;
|
||
switch (token_type)
|
||
{
|
||
case VARIABLE:
|
||
*result = find_var(token);
|
||
str = QString("%1").arg(*result, 0, 'f', 3);
|
||
debugFormula.append(str);
|
||
get_token();
|
||
return;
|
||
case NUMBER:
|
||
*result = token.toDouble();
|
||
str = QString("%1").arg(*result, 0, 'f', 3);
|
||
debugFormula.append(str);
|
||
get_token();
|
||
return;
|
||
default:
|
||
serror(0);
|
||
}
|
||
}
|
||
|
||
void Calculator::arith(QChar o, qreal *r, qreal *h)
|
||
{
|
||
qreal t;//, ex;
|
||
|
||
switch (o.toLatin1())
|
||
{
|
||
case '-':
|
||
*r = *r-*h;
|
||
break;
|
||
case '+':
|
||
*r = *r+*h;
|
||
break;
|
||
case '*':
|
||
*r = *r * *h;
|
||
break;
|
||
case '/':
|
||
*r = (*r)/(*h);
|
||
break;
|
||
case '%':
|
||
t = (*r)/(*h);
|
||
*r = *r-(t*(*h));
|
||
break;
|
||
case '^':
|
||
*r = pow(*r, *h);
|
||
break;
|
||
default:
|
||
break;
|
||
}
|
||
}
|
||
|
||
void Calculator::unary(QChar o, qreal *r)
|
||
{
|
||
if (o=='-')
|
||
{
|
||
*r = -(*r);
|
||
}
|
||
}
|
||
|
||
qreal Calculator::find_var(QString s)
|
||
{
|
||
bool ok = false;
|
||
qreal value = data->FindVar(s, &ok);
|
||
if (ok == false)
|
||
{
|
||
qDebug()<<s;
|
||
serror(4); /* don't variable */
|
||
return 0;
|
||
}
|
||
return value;
|
||
}
|
||
|
||
void Calculator::serror(qint32 error)
|
||
{
|
||
QString e[]=
|
||
{
|
||
"Синтаксическая ошибка",
|
||
"Непарные круглые скобки",
|
||
"Это не выражение",
|
||
"Предполагается символ равенства",
|
||
"Не переменная"
|
||
};
|
||
errorMsg->clear();
|
||
*errorMsg = e[error];
|
||
qDebug()<<e[error];
|
||
}
|
||
|
||
char Calculator::look_up(QString s)
|
||
{
|
||
QString p;
|
||
|
||
p = s;
|
||
p = p.toLower();
|
||
|
||
return 0;
|
||
}
|
||
|
||
bool Calculator::isdelim(QChar c)
|
||
{
|
||
if (StrChr(" ;,+-<>/*%^=()", c) || c=='\n' || c=='\r' || c=='\0')
|
||
{
|
||
return true;
|
||
}
|
||
return false;
|
||
}
|
||
|
||
bool Calculator::iswhite(QChar c)
|
||
{
|
||
if (c==' ' || c=='\t')
|
||
{
|
||
return true;
|
||
}
|
||
else
|
||
{
|
||
return false;
|
||
}
|
||
}
|
||
|
||
void Calculator::get_token()
|
||
{
|
||
QString *temp;
|
||
|
||
token_type=0; tok=0;
|
||
token.clear();
|
||
temp=&token;
|
||
|
||
if (prog[index]=='\0')
|
||
{ /* end of file */
|
||
token="\0";
|
||
tok=FINISHED;
|
||
token_type=DELIMITER;
|
||
return;
|
||
}
|
||
|
||
while (iswhite(prog[index]))
|
||
{
|
||
++index; /* skip spaces */
|
||
}
|
||
|
||
if (prog[index]=='\r')
|
||
{ /* crtl */
|
||
++index; ++index;
|
||
tok= EOL; token='\r';
|
||
token.append('\n');token.append("\0");
|
||
token_type = DELIMITER;
|
||
return;
|
||
}
|
||
|
||
if (StrChr("+-*^/%=;(),><", prog[index]))
|
||
{ /* delimiter */
|
||
*temp=prog[index];
|
||
index++; /* jump to the next position */
|
||
temp->append("\0");
|
||
token_type=DELIMITER;
|
||
debugFormula.append(token);
|
||
return;
|
||
}
|
||
if (prog[index]=='"')
|
||
{ /* quoted string */
|
||
index++;
|
||
while (prog[index] != '"' && prog[index] != '\r')
|
||
{
|
||
temp->append(prog[index]);
|
||
index++;
|
||
}
|
||
if (prog[index]=='\r')
|
||
{
|
||
serror(1);
|
||
}
|
||
index++;temp->append("\0");
|
||
token_type=QUOTE;
|
||
return;
|
||
}
|
||
if (prog[index].isDigit())
|
||
{ /* number */
|
||
while (isdelim(prog[index]) == false)
|
||
{
|
||
temp->append(prog[index]);
|
||
index++;
|
||
}
|
||
temp->append('\0');
|
||
token_type = NUMBER;
|
||
return;
|
||
}
|
||
|
||
if (prog[index].isPrint())
|
||
{ /* variable or command */
|
||
while (isdelim(prog[index]) == false)
|
||
{
|
||
temp->append(prog[index]);
|
||
index++;
|
||
}
|
||
token_type=STRING;
|
||
}
|
||
temp->append("\0");
|
||
|
||
/* Seen if there is a command line or a variable */
|
||
if (token_type==STRING)
|
||
{
|
||
tok=look_up(token);
|
||
if (tok == false)
|
||
{
|
||
token_type = VARIABLE;
|
||
}
|
||
else
|
||
{
|
||
token_type = COMMAND; /* It is command */
|
||
}
|
||
}
|
||
return;
|
||
}
|
||
|
||
bool Calculator::StrChr(QString string, QChar c)
|
||
{
|
||
return string.contains(c, Qt::CaseInsensitive);
|
||
}
|
||
|
||
void Calculator::putback()
|
||
{
|
||
QString t;
|
||
t = token;
|
||
index = index - t.size();
|
||
}
|