1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
|
/* 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_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
|
