/*
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.
*/

#ifndef __formula_h__
#define __formula_h__

class Formula
{
public:
	class Args
	{
	private:
		struct Item
		{
			char *name;
			int value;
			Item *next;

			Item(char *aName, int aValue, Item *aNext) : value(aValue), next(aNext) { name = aName ? mir_strdup(aName) : 0; }
			~Item() { if (name) mir_free(name); }
		};
		Item *items;
	public:
		Args() :items(0){}
		~Args(){ clear(); }
		void	add(char *name, int value)
		{
			for (Item *p = items; p; p = p->next)
				if (!mir_strcmp(p->name, name))
				{
					p->value = value;
					return;
				}
			items = new Item(name, value, items);
		}
		int		get(char *name)
		{
			for (Item *p = items; p; p = p->next)
				if (!mir_strcmp(p->name, name))
					return p->value;
			return 0;
		}
		void	clear()
		{
			while (items)
			{
				Item *p = items->next;
				delete items;
				items = p;
			}
		}
	};

private:
	wchar_t *m_str;
	int eval_neq(wchar_t *&s, Args *args, bool *vars) const;
	int eval_sum(wchar_t *&s, Args *args, bool *vars) const;
	int eval_mul(wchar_t *&s, Args *args, bool *vars) const;
	int eval_atom(wchar_t *&s, Args *args, bool *vars) const;

public:
	Formula() :m_str(mir_tstrdup(L"")) {}
	Formula(wchar_t *s) :m_str(mir_tstrdup(s)) {}
	~Formula() { mir_free(m_str); }
	void	set(wchar_t *s){ mir_free(m_str); m_str = mir_tstrdup(s); }
	int		eval(Args *args, bool *vars = 0) const;
};

#endif // __formula_h__