lctype.h revision 344220 
1/*
2** $Id: lctype.h,v 1.12.1.1 2013/04/12 18:48:47 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) */
71LUAI_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
96