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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.
*
*/
#ifndef GOB_EXPRESSION_H
#define GOB_EXPRESSION_H
#include "common/scummsys.h"
namespace Gob {
class GobEngine;
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_END_MARKER = 12, // Marks end of an array or string
OP_ARRAY_INT8 = 16,
OP_LOAD_VAR_INT16 = 17,
OP_LOAD_VAR_INT8 = 18,
OP_LOAD_IMM_INT32 = 19,
OP_LOAD_IMM_INT16 = 20,
OP_LOAD_IMM_INT8 = 21,
OP_LOAD_IMM_STR = 22,
OP_LOAD_VAR_INT32 = 23,
OP_LOAD_VAR_INT32_AS_INT16 = 24,
OP_LOAD_VAR_STR = 25,
OP_ARRAY_INT32 = 26,
OP_ARRAY_INT16 = 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 {
TYPE_IMM_INT8 = OP_LOAD_IMM_INT8, // 21
TYPE_IMM_INT32 = OP_LOAD_IMM_INT32, // 19
TYPE_IMM_INT16 = OP_LOAD_IMM_INT16, // 20
TYPE_IMM_STR = OP_LOAD_IMM_STR, // 22
TYPE_VAR_INT8 = OP_LOAD_VAR_INT8, // 18
TYPE_VAR_INT16 = OP_LOAD_VAR_INT16, // 17
TYPE_VAR_INT32 = OP_LOAD_VAR_INT32, // 23
TYPE_VAR_STR = OP_LOAD_VAR_STR, // 25
TYPE_ARRAY_INT8 = OP_ARRAY_INT8, // 16
TYPE_ARRAY_INT16 = OP_ARRAY_INT16, // 27
TYPE_ARRAY_INT32 = OP_ARRAY_INT32, // 26
TYPE_ARRAY_STR = OP_ARRAY_STR, // 28
TYPE_VAR_INT32_AS_INT16 = OP_LOAD_VAR_INT32_AS_INT16 // 24
};
enum {
// FIXME: The following two 'truth values' are stored inside the list
// of "operators". So they somehow coincide with OP_LOAD_VAR_INT32
// and OP_LOAD_VAR_INT32_AS_INT16. I haven't yet quite understood
// how, resp. what that means. You have been warned.
GOB_TRUE = 24,
GOB_FALSE = 23
};
class Expression {
public:
Expression(GobEngine *vm);
virtual ~Expression() {}
void skipExpr(char stopToken);
void printExpr(char stopToken);
void printVarIndex();
int16 parseVarIndex(uint16 *size = 0, uint16 *type = 0);
int16 parseValExpr(byte stopToken = 99);
int16 parseExpr(byte stopToken, byte *type);
int32 getResultInt();
char *getResultStr();
private:
class Stack {
public:
byte *opers;
int32 *values;
Stack(size_t size = 20);
~Stack();
};
class StackFrame {
public:
byte *opers;
int32 *values;
int16 pos;
StackFrame(const Stack &stack);
void push(int count = 1);
void pop(int count = 1);
};
enum PointerType {
kExecPtr = 0,
kInterVar = 1,
kResStr = 2
};
GobEngine *_vm;
int32 _resultInt;
char _resultStr[200];
int32 encodePtr(byte *ptr, int type);
byte *decodePtr(int32 n);
void printExpr_internal(char stopToken);
bool getVarBase(uint32 &varBase, bool mindStop = false,
uint16 *size = 0, uint16 *type = 0);
int cmpHelper(const StackFrame &stackFrame);
void loadValue(byte operation, uint32 varBase, const StackFrame &stackFrame);
void simpleArithmetic1(StackFrame &stackFrame);
void simpleArithmetic2(StackFrame &stackFrame);
bool complexArithmetic(Stack &stack, StackFrame &stackFrame, int16 brackStart);
void getResult(byte operation, int32 value, byte *type);
};
} // End of namespace Gob
#endif // GOB_EXPRESSION_H
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