lua/lctype.h at master · lua/lua

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	/*
	** $Id: lctype.h $
	** '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))


	/*
	** In ASCII, this 'ltolower' is correct for alphabetic characters and
	** for '.'. That is enough for Lua needs. ('check_exp' ensures that
	** the character either is an upper-case letter or is unchanged by
	** the transformation, which holds for lower-case letters and '.'.)
	*/
	#define ltolower(c) \
	check_exp(('A' <= (c) && (c) <= 'Z') \|\| (c) == ((c) \| ('A' ^ 'a')), \
	(c) \| ('A' ^ 'a'))


	/* one entry for each character and for -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