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/*
Popup Plus plugin for Miranda IM
Copyright © 2002 Luca Santarelli,
© 2004-2007 Victor Pavlychko
© 2010 MPK
© 2010 Merlin_de
This program 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 2
of the License, or (at your option) any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
===============================================================================
File name : $HeadURL: http://svn.miranda.im/mainrepo/popup/trunk/src/formula.cpp $
Revision : $Revision: 1610 $
Last change on : $Date: 2010-06-23 00:55:13 +0300 (Ср, 23 июн 2010) $
Last change by : $Author: Merlin_de $
===============================================================================
*/
#include "headers.h"
static inline bool myisspace(char ch)
{
return (ch >= 0) && (ch <= 32);
}
int Formula::eval_neq(char *&s, Args *args, bool *vars) const
{
int left = eval_sum(s, args, vars);
while (*s)
{
if (myisspace(*s))
{
++s;
} else
if (*s == '<')
{
// this is needed due to side effects caused by min() macro...
int tmp = eval_sum(++s, args, vars);
left = min(left, tmp);
} else
if (*s == '>')
{
// this is needed due to side effects caused by max() macro...
int tmp = eval_sum(++s, args, vars);
left = max(left, tmp);
} else
{
break;
}
}
return left;
}
int Formula::eval_sum(char *&s, Args *args, bool *vars) const
{
int left = eval_mul(s, args, vars);
while (*s)
{
if (myisspace(*s))
{
++s;
} else
if (*s == '+')
{
left += eval_mul(++s, args, vars);
} else
if (*s == '-')
{
left -= eval_mul(++s, args, vars);
} else
{
break;
}
}
return left;
}
int Formula::eval_mul(char *&s, Args *args, bool *vars) const
{
int left = eval_atom(s, args, vars);
while (*s)
{
if (myisspace(*s))
{
++s;
} else
if(*s == '*')
{
left *= eval_atom(++s, args, vars);
} else
if(*s == '/')
{
if (int right = eval_atom(++s, args, vars))
left /= right;
} else
if(*s == '%')
{
if (int right = eval_atom(++s, args, vars))
left %= right;
} else
{
break;
}
}
return left;
}
int Formula::eval_atom(char *&s, Args *args, bool *vars) const
{
while (*s)
{
if (myisspace(*s))
{
++s;
} else
if (*s == '(')
{
int res = eval_neq(++s, args, vars);
if (*s == ')')
++s;
return res;
} else
if ((*s == '+') || (*s == '-'))
{
int sign = 1;
if (*s == '-')
sign = -1;
return sign * eval_neq(++s, args, vars);
} else
if (*s == '!')
{
return !eval_neq(++s, args, vars);
} else
if ((*s >= '0') && (*s <= '9'))
{
int res = 0;
while ((*s >= '0') && (*s <= '9'))
res = res * 10 + *s++ - '0';
return res;
} else
{
if (!args)
return 0;
char buf[1024];
char *bufptr = buf;
while (((*s >= '0') && (*s <= '9')) || ((*s >= 'a') && (*s <= 'z')) || ((*s >= 'A') && (*s <= 'A')) || (*s == '_') || (*s == '.'))
*bufptr++ = *s++;
*bufptr = 0;
int res = args->get(buf);
if (vars) *vars = true;
return res;
}
}
return 0;
}
int Formula::eval(Args *args, bool *vars) const
{
if (vars) *vars = false;
char *s = m_str;
int res = eval_neq(s, args, vars);
return res;
}
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