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/* ScummVM - Scumm Interpreter
* Copyright (C) 2006 The ScummVM project
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
#ifndef GUI_EVAL_H
#define GUI_EVAL_H
#include "common/stdafx.h"
#include "common/str.h"
#include "common/hashmap.h"
namespace GUI {
using Common::String;
using Common::HashMap;
#define EVAL_UNDEF_VAR -13375
enum tokenTypes {
tDelimiter,
tVariable,
tNumber,
tString
};
enum evalErrors {
eSyntaxError,
eExtraBracket,
eUnclosedBracket,
eBadExpr,
eUndefVar
};
class Eval {
public:
Eval();
~Eval();
int eval(const String &input, const String §ion, const String &name, int startpos);
void setAlias(const String §ion, const char *name, const String &value);
void setVar(const String §ion, const char *name, const String &value);
void setParent(const String &name);
void setVar(const char *name, int val) { _vars[name] = val; }
void setAlias(const char *name, const String &val) { _aliases[name] = val; }
int getVar(const String &s) { return getVar_(s.c_str()); }
int getVar(const String &s, int def) {
int val = getVar_(s.c_str());
return (val == EVAL_UNDEF_VAR) ? def : val;
};
uint getNumVars() { return _vars.size(); }
void reset();
struct CharStar_EqualTo {
bool operator()(const char *x, const char *y) const { return strcmp(x, y) == 0; }
};
//typedef HashMap<String, int> VariablesMap;
typedef HashMap<const char *, int, Common::Hash<const char *>, CharStar_EqualTo> VariablesMap;
typedef HashMap<const char *, String, Common::Hash<const char *>, CharStar_EqualTo> AliasesMap;
private:
void getToken();
void level2(int *);
void level3(int *);
void level4(int *);
void level5(int *);
void primitive(int *);
void arith(char op, int *r, int *h);
void unary(char op, int *r);
void exprError(int error);
int getVar_(const char *s, bool includeAliases = true);
int getBuiltinVar(const char *s);
void loadConstants();
char _input[256];
String _section;
String _name;
int _startpos;
int _tokenType;
int _pos;
char _token[256];
AliasesMap _aliases;
VariablesMap _vars;
};
} // end of namespace GUI
#endif
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