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1 /*
2 ** $Id: lctype.h,v 1.12 2011/07/15 12:50:29 roberto Exp $
3 ** 'ctype' functions for Lua
4 ** See Copyright Notice in lua.h
5 */
6
7 #ifndef lctype_h
8 #define lctype_h
9
10 #include "lua.h"
11
12
13 /*
14 ** WARNING: the functions defined here do not necessarily correspond
15 ** to the similar functions in the standard C ctype.h. They are
16 ** optimized for the specific needs of Lua
17 */
18
19 #if !defined(LUA_USE_CTYPE)
20
21 #if 'A' == 65 && '0' == 48
22 /* ASCII case: can use its own tables; faster and fixed */
23 #define LUA_USE_CTYPE 0
24 #else
25 /* must use standard C ctype */
26 #define LUA_USE_CTYPE 1
27 #endif
28
29 #endif
30
31
32 #if !LUA_USE_CTYPE /* { */
33
34 #include <limits.h>
35
36 #include "llimits.h"
37
38
39 #define ALPHABIT 0
40 #define DIGITBIT 1
41 #define PRINTBIT 2
42 #define SPACEBIT 3
43 #define XDIGITBIT 4
44
45
46 #define MASK(B) (1 << (B))
47
48
49 /*
50 ** add 1 to char to allow index -1 (EOZ)
51 */
52 #define testprop(c,p) (luai_ctype_[(c)+1] & (p))
53
54 /*
55 ** 'lalpha' (Lua alphabetic) and 'lalnum' (Lua alphanumeric) both include '_'
56 */
57 #define lislalpha(c) testprop(c, MASK(ALPHABIT))
58 #define lislalnum(c) testprop(c, (MASK(ALPHABIT) | MASK(DIGITBIT)))
59 #define lisdigit(c) testprop(c, MASK(DIGITBIT))
60 #define lisspace(c) testprop(c, MASK(SPACEBIT))
61 #define lisprint(c) testprop(c, MASK(PRINTBIT))
62 #define lisxdigit(c) testprop(c, MASK(XDIGITBIT))
63
64 /*
65 ** this 'ltolower' only works for alphabetic characters
66 */
67 #define ltolower(c) ((c) | ('A' ^ 'a'))
68
69
70 /* two more entries for 0 and -1 (EOZ) */
71 LUAI_DDEC const lu_byte luai_ctype_[UCHAR_MAX + 2];
72
73
74 #else /* }{ */
75
76 /*
77 ** use standard C ctypes
78 */
79
80 #include <ctype.h>
81
82
83 #define lislalpha(c) (isalpha(c) || (c) == '_')
84 #define lislalnum(c) (isalnum(c) || (c) == '_')
85 #define lisdigit(c) (isdigit(c))
86 #define lisspace(c) (isspace(c))
87 #define lisprint(c) (isprint(c))
88 #define lisxdigit(c) (isxdigit(c))
89
90 #define ltolower(c) (tolower(c))
91
92 #endif /* } */
93
94 #endif
95
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