1/*
2** $Id: lctype.h $
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/*
66** In ASCII, this 'ltolower' is correct for alphabetic characters and
67** for '.'. That is enough for Lua needs. ('check_exp' ensures that
68** the character either is an upper-case letter or is unchanged by
69** the transformation, which holds for lower-case letters and '.'.)
70*/
71#define ltolower(c) \
72 check_exp(('A' <= (c) && (c) <= 'Z') || (c) == ((c) | ('A' ^ 'a')), \
73 (c) | ('A' ^ 'a'))
74
75
76/* one entry for each character and for -1 (EOZ) */
77LUAI_DDEC(const lu_byte luai_ctype_[UCHAR_MAX + 2];)
78
79
80#else /* }{ */
81
82/*
83** use standard C ctypes
84*/
85
86#include <ctype.h>
87
88
89#define lislalpha(c) (isalpha(c) || (c) == '_')
90#define lislalnum(c) (isalnum(c) || (c) == '_')
91#define lisdigit(c) (isdigit(c))
92#define lisspace(c) (isspace(c))
93#define lisprint(c) (isprint(c))
94#define lisxdigit(c) (isxdigit(c))
95
96#define ltolower(c) (tolower(c))
97
98#endif /* } */
99
100#endif
101
102