/*
** $Id: lctype.h,v 1.12.1.1 2013/04/12 18:48:47 roberto Exp $
** 'ctype' functions for Lua
** See Copyright Notice in lua.h
*/

#ifndef lctype_h
#define lctype_h

#include "lua.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
*/

#if !defined(LUA_USE_CTYPE)

#if 'A' == 65 && '0' == 48
/* ASCII case: can use its own tables; faster and fixed */
#define LUA_USE_CTYPE 0
#else
/* must use standard C ctype */
#define LUA_USE_CTYPE 1
#endif

#endif

#if !LUA_USE_CTYPE /* { */

#include <limits.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 'ltolower' only works for alphabetic characters
*/
#define ltolower(c) ((c) | ('A' ^ 'a'))

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

#else /* }{ */

/*
** use standard C ctypes
*/

#include <ctype.h>

#define lislalpha(c) (isalpha(c) || (c) == '_')
#define lislalnum(c) (isalnum(c) || (c) == '_')
#define lisdigit(c) (isdigit(c))
#define lisspace(c) (isspace(c))
#define lisprint(c) (isprint(c))
#define lisxdigit(c) (isxdigit(c))

#define ltolower(c) (tolower(c))

#endif /* } */

#endif
