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comparison lwlib/lw_expr.h @ 334:f2173d18c73f

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author lost
date Thu, 04 Mar 2010 02:24:38 +0000
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333:ebff3a3e8fa6 334:f2173d18c73f
1 /*
2 lwexpr.h
3
4 Copyright © 2010 William Astle
5
6 This file is part of LWTOOLS.
7
8 LWTOOLS is free software: you can redistribute it and/or modify it under the
9 terms of the GNU General Public License as published by the Free Software
10 Foundation, either version 3 of the License, or (at your option) any later
11 version.
12
13 This program is distributed in the hope that it will be useful, but WITHOUT
14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 more details.
17
18 You should have received a copy of the GNU General Public License along with
19 this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #ifndef ___lw_expr_h_seen___
23 #define ___lw_expr_h_seen___
24
25
26 enum
27 {
28 lw_expr_type_oper, // operator term
29 lw_expr_type_int, // integer
30 lw_expr_type_var, // a "variable" (string for the name)
31 lw_expr_type_special // a "special" reference (user defined)
32 };
33
34 enum
35 {
36 lw_expr_oper_plus = 1, // addition
37 lw_expr_oper_minus, // subtraction
38 lw_expr_oper_times, // multiplication
39 lw_expr_oper_divide, // division
40 lw_expr_oper_mod, // modulus
41 lw_expr_oper_intdiv, // integer division
42 lw_expr_oper_bwand, // bitwise and
43 lw_expr_oper_bwor, // bitwise or
44 lw_expr_oper_bwxor, // bitwise xor
45 lw_expr_oper_and, // boolean and
46 lw_expr_oper_or, // boolean or
47 lw_expr_oper_neg, // unary negation, 2's complement
48 lw_expr_oper_com // unary 1's complement
49 };
50
51 #ifdef ___lw_expr_c_seen___
52
53 typedef struct lw_expr_priv * lw_expr_t;
54
55 struct lw_expr_opers
56 {
57 lw_expr_t p;
58 struct lw_expr_opers *next;
59 };
60
61 struct lw_expr_priv
62 {
63 int type; // type of term
64 int value; // integer value
65 void *value2; // misc pointer value
66 int refcount; // reference count
67 struct lw_expr_opers *operands; // ptr to list of operands (for operators)
68 };
69
70
71 #else /* def ___lw_expr_c_seen___ */
72
73 typedef void * lw_expr_t;
74
75 extern lw_expr_t lwexpr_create(void);
76 extern void lwexpr_destroy(lw_expr_t E);
77 extern lw_expr_t lw_expr_deref(lw_expr_t r);
78 extern lw_expr_t lw_expr_copy(lw_expr_t E);
79 extern void lw_expr_add_operand(lw_expr_t E, lw_expr_t O);
80 extern lw_expr_t lw_expr_deepcopy(lw_expr_t E);
81 extern lw_expr_t lw_expr_build(int exprtype, ...);
82 extern void lw_expr_print(lw_expr_t E);
83 extern int lw_expr_compare(lw_expr_t E1, lw_expr_t E2);
84
85 #endif /* def ___lw_expr_c_seen___ */
86
87 #endif /* ___lw_expr_h_seen___ */