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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef PRIVATE_GRAMMAR_H
#define PRIVATE_GRAMMAR_H
#include "common/str.h"
#include "common/hash-str.h"
#include "common/hash-ptr.h"
#include "common/queue.h"
#include "common/list.h"
#include "common/array.h"
#include "common/rect.h"
#include "private/symbol.h"
#define NSTACK 256
#define NPROG 10000
namespace Private {
typedef struct Datum { /* interpreter stack type */
short type;
union {
int val;
const char *str;
Symbol *sym;
Common::Rect *rect;
} u;
} Datum;
typedef struct Arg {
int n;
int (** inst)();
} Arg;
typedef int (* Inst)(); /* machine instruction */
#define STOP (Inst) 0
typedef Common::HashMap<void *, Common::String *> PtrToName;
void initInsts();
void initFuncs();
namespace Settings {
typedef struct Setting {
Datum stack[NSTACK]; /* the stack */
Inst prog[NPROG]; /* the machine */
} Setting;
typedef Common::HashMap<Common::String, Setting *> SettingMap;
class SettingMaps {
public:
Setting *_setting;
SettingMap _map;
void init();
void save(const char *);
void load(const Common::String &);
};
extern SettingMaps *g_setts;
}
// Funtions
typedef Common::Array<Datum> ArgArray;
void call(const char *, const ArgArray &);
// Code Generation and Execution
namespace Gen {
class VM {
public:
Datum *_stack; /* the stack */
Datum *_stackp; /* next free spot on stack */
Inst *_progp; /* next free spot for code generation */
Inst *_prog; /* the machine */
Inst *_pc; /* program counter during execution */
void run(); /* run the virtual machine */
};
extern VM *g_vm;
Datum pop();
int push(const Datum &);
Inst *code(const Inst &);
int eval();
int add();
int negate();
int power();
int assign();
int bltin();
int varpush();
int constpush();
int strpush();
int funcpush();
int print();
int ifcode();
int fail();
int lt();
int gt();
int le();
int ge();
int eq();
int ne();
int randbool();
// Code Execution
void execute(Inst *);
}
} // End of namespace Private
#endif
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