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
|
/* 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.
*
*/
/*
* This code is based on original Tony Tough source code
*
* Copyright (c) 1997-2003 Nayma Software
*/
#ifndef MPAL_EXPR_H
#define MPAL_EXPR_H
#include "tony/mpal/memory.h"
namespace Tony {
namespace MPAL {
/**
* @defgroup Mathamatical operations
*/
//@{
#define OP_MUL ((1 << 4) | 0)
#define OP_DIV ((1 << 4) | 1)
#define OP_MODULE ((1 << 4) | 2)
#define OP_ADD ((2 << 4) | 0)
#define OP_SUB ((2 << 4) | 1)
#define OP_SHL ((3 << 4) | 0)
#define OP_SHR ((3 << 4) | 1)
#define OP_MINOR ((4 << 4) | 0)
#define OP_MAJOR ((4 << 4) | 1)
#define OP_MINEQ ((4 << 4) | 2)
#define OP_MAJEQ ((4 << 4) | 3)
#define OP_EQUAL ((5 << 4) | 0)
#define OP_NOEQUAL ((5 << 4) | 1)
#define OP_BITAND ((6 << 4) | 0)
#define OP_BITXOR ((7 << 4) | 0)
#define OP_BITOR ((8 << 4) | 0)
#define OP_AND ((9 << 4) | 0)
#define OP_OR ((10 << 4) | 0)
//@}
/**
* @defgroup Structures
*/
//@{
/**
* Mathamatical framework to manage operations
*/
typedef struct {
byte _type; // Object Type (see enum ExprListTypes)
union {
int _num; // Identifier (if type == ELT_NUMBER)
char *_name; // Variable name (if type == ELT_VAR)
MpalHandle _son; // Handle expressions (if type == ELT_PARENTH)
byte *_pson; // Handle lockato (if type == ELT_PARENTH2)
} _val;
byte _symbol; // Mathematic symbols (see #define OP_*)
} Expression;
typedef Expression *LpExpression;
//@}
/**
* Object types that can be contained in an EXPRESSION structure
*/
enum ExprListTypes {
ELT_NUMBER = 1,
ELT_VAR = 2,
ELT_PARENTH = 3,
ELT_PARENTH2 = 4
};
/****************************************************************************\
* Function Prototypes
\****************************************************************************/
/**
* Parses a mathematical expression from the MPC file
*
* @param buf Buffer containing the expression to evaluate
* @param h Pointer to a handle that, at the end of execution,
* will point to the area of memory containing the parsed expression
* @returns Pointer to the buffer immediately after the expression, or NULL if error.
*/
const byte *parseExpression(const byte *lpBuf, MpalHandle *h);
/**
* Calculate the value of a mathamatical expression
*
* @param h Handle to the expression
* @returns Numeric value
*/
int evaluateExpression(MpalHandle h);
/**
* Compare two mathematical expressions together
*
* @param h1 Expression to be compared
* @param h2 Expression to be compared
*/
bool compareExpressions(MpalHandle h1, MpalHandle h2);
/**
* Frees an expression that was previously parsed
*
* @param h Handle for the expression
*/
void freeExpression(MpalHandle h);
} // end of namespace MPAL
} // end of namespace Tony
#endif
|
