lua.lua/lctype.h

/*
** $Id: lctype.h,v 1.8 2009/11/19 19:06:52 roberto Exp roberto $
** 'ctype' functions for Lua
** See Copyright Notice in lua.h
*/

#ifndef lctype_h
#define lctype_h


/*
** WARNING: the functions defined here do not necessarily correspond 
** to the similar functions in the standard C ctype.h. They are
** optimized for the specific needs of Lua
*/


#include <limits.h>

#include "lua.h"

#include "llimits.h"


#define ALPHABIT	0
#define DIGITBIT	1
#define PRINTBIT	2
#define SPACEBIT	3
#define XDIGITBIT	4


#define MASK(B)		(1 << (B))


/*
** add 1 to char to allow index -1 (EOZ)
*/
#define testprop(c,p)	(luai_ctype_[(c)+1] & (p))

/*
** 'lalpha' (Lua alphabetic) and 'lalnum' (Lua alphanumeric) both include '_'
*/
#define lislalpha(c)	testprop(c, MASK(ALPHABIT))
#define lislalnum(c)	testprop(c, (MASK(ALPHABIT) | MASK(DIGITBIT)))
#define lisdigit(c)	testprop(c, MASK(DIGITBIT))
#define lisspace(c)	testprop(c, MASK(SPACEBIT))
#define lisprint(c)	testprop(c, MASK(PRINTBIT))
#define lisxdigit(c)	testprop(c, MASK(XDIGITBIT))

/*
** this 'ltoupper' only works for alphabetic characters
*/
#define ltoupper(c)	((c) & ~32)


/* one more entry for 0 and one more for -1 (EOZ) */
LUAI_DDEC const lu_byte luai_ctype_[UCHAR_MAX + 2];

#endif