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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 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 GOB_PARSE_H
#define GOB_PARSE_H
namespace Gob {
enum {
OP_NEG = 1,
OP_ADD = 2,
OP_SUB = 3,
OP_BITOR = 4,
OP_MUL = 5,
OP_DIV = 6,
OP_MOD = 7,
OP_BITAND = 8,
OP_BEGIN_EXPR = 9,
OP_END_EXPR = 10,
OP_NOT = 11,
OP_ARRAY_UINT8 = 16,
// FIXME: OP_LOAD_VAR_UINT16 comment says "uint16 variable load" in
// Parse::printExpr_internal, and does that in Parse_v2::parseExpr,
// but reads int8 in Parse_v2::parseValExpr
OP_LOAD_VAR_UINT16 = 17,
// FIXME: OP_LOAD_VAR_UINT8 comment says "uint8 variable load" in
// Parse::printExpr_internal, but reads int8 in Parse_v2::parseValExpr
OP_LOAD_VAR_UINT8 = 18,
OP_LOAD_IMM_INT32 = 19,
OP_LOAD_IMM_INT16 = 20,
OP_LOAD_IMM_INT8 = 21,
OP_LOAD_IMM_STR = 22,
OP_LOAD_VAR_UINT32 = 23, // ???
OP_LOAD_VAR_UINT32_AS_UINT16 = 24, // ???
OP_LOAD_VAR_STR = 25,
OP_ARRAY_UINT32 = 26,
OP_ARRAY_UINT16 = 27,
OP_ARRAY_STR = 28,
OP_FUNC = 29,
OP_OR = 30, // Logical OR
OP_AND = 31, // Logical AND
OP_LESS = 32,
OP_LEQ = 33,
OP_GREATER = 34,
OP_GEQ = 35,
OP_EQ = 36,
OP_NEQ = 37
};
enum {
FUNC_SQRT1 = 0,
FUNC_SQRT2 = 1,
FUNC_SQRT3 = 6,
FUNC_SQR = 5,
FUNC_ABS = 7,
FUNC_RAND = 10
};
enum {
// FIXME: The following two 'truth values' are stored inside the list
// of "operators". So they somehow coincide with OP_LOAD_VAR_UINT32
// and OP_LOAD_VAR_UINT32_AS_UINT16. I haven't yet quite understood
// how, resp. what that means. You have been warned.
GOB_TRUE = 24,
GOB_FALSE = 23
};
class Parse {
public:
void skipExpr(char stopToken);
void printExpr(char stopToken);
void printVarIndex(void);
virtual int16 parseVarIndex(uint16 *arg_0 = 0, uint16 *arg_4 = 0) = 0;
virtual int16 parseValExpr(byte stopToken = 99) = 0;
virtual int16 parseExpr(byte stopToken, byte *resultPtr) = 0;
Parse(GobEngine *vm);
virtual ~Parse() {}
protected:
enum PointerType {
kExecPtr = 0,
kInterVar = 1,
kResStr = 2
};
GobEngine *_vm;
int32 encodePtr(byte *ptr, int type);
byte *decodePtr(int32 n);
void printExpr_internal(char stopToken);
int cmpHelper(byte *operPtr, int32 *valPtr);
};
class Parse_v1 : public Parse {
public:
Parse_v1(GobEngine *vm);
virtual ~Parse_v1() {}
virtual int16 parseVarIndex(uint16 *arg_0 = 0, uint16 *arg_4 = 0);
virtual int16 parseValExpr(byte stopToken = 99);
virtual int16 parseExpr(byte stopToken, byte *resultPtr);
};
class Parse_v2 : public Parse_v1 {
public:
Parse_v2(GobEngine *vm);
virtual ~Parse_v2() {}
virtual int16 sub_12063(int16 arg_0, byte arg_2, uint32 arg_3, uint16 arg_7, uint16 arg_9);
virtual int16 parseVarIndex(uint16 *arg_0 = 0, uint16 *arg_4 = 0);
virtual int16 parseValExpr(byte stopToken = 99);
virtual int16 parseExpr(byte stopToken, byte *resultPtr);
};
} // End of namespace Gob
#endif // GOB_PARSE_H
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