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https://github.com/lua/lua
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8496112a18
The old documentation said that 'ltolower' only works for alphabetic
characters. However, 'l_str2d' uses it (correctly) also on dots ('.').
102 lines
2.1 KiB
C
102 lines
2.1 KiB
C
/*
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** $Id: lctype.h $
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** 'ctype' functions for Lua
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** See Copyright Notice in lua.h
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*/
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#ifndef lctype_h
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#define lctype_h
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#include "lua.h"
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/*
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** WARNING: the functions defined here do not necessarily correspond
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** to the similar functions in the standard C ctype.h. They are
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** optimized for the specific needs of Lua.
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*/
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#if !defined(LUA_USE_CTYPE)
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#if 'A' == 65 && '0' == 48
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/* ASCII case: can use its own tables; faster and fixed */
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#define LUA_USE_CTYPE 0
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#else
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/* must use standard C ctype */
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#define LUA_USE_CTYPE 1
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#endif
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#endif
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#if !LUA_USE_CTYPE /* { */
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#include <limits.h>
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#include "llimits.h"
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#define ALPHABIT 0
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#define DIGITBIT 1
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#define PRINTBIT 2
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#define SPACEBIT 3
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#define XDIGITBIT 4
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#define MASK(B) (1 << (B))
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/*
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** add 1 to char to allow index -1 (EOZ)
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*/
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#define testprop(c,p) (luai_ctype_[(c)+1] & (p))
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/*
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** 'lalpha' (Lua alphabetic) and 'lalnum' (Lua alphanumeric) both include '_'
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*/
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#define lislalpha(c) testprop(c, MASK(ALPHABIT))
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#define lislalnum(c) testprop(c, (MASK(ALPHABIT) | MASK(DIGITBIT)))
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#define lisdigit(c) testprop(c, MASK(DIGITBIT))
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#define lisspace(c) testprop(c, MASK(SPACEBIT))
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#define lisprint(c) testprop(c, MASK(PRINTBIT))
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#define lisxdigit(c) testprop(c, MASK(XDIGITBIT))
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/*
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** In ASCII, this 'ltolower' is correct for alphabetic characters and
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** for '.'. That is enough for Lua needs. ('check_exp' ensures that
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** the character either is an upper-case letter or is unchanged by
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** the transformation, which holds for lower-case letters and '.'.)
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*/
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#define ltolower(c) \
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check_exp(('A' <= (c) && (c) <= 'Z') || (c) == ((c) | ('A' ^ 'a')), \
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(c) | ('A' ^ 'a'))
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/* one entry for each character and for -1 (EOZ) */
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LUAI_DDEC(const lu_byte luai_ctype_[UCHAR_MAX + 2];)
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#else /* }{ */
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/*
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** use standard C ctypes
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*/
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#include <ctype.h>
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#define lislalpha(c) (isalpha(c) || (c) == '_')
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#define lislalnum(c) (isalnum(c) || (c) == '_')
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#define lisdigit(c) (isdigit(c))
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#define lisspace(c) (isspace(c))
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#define lisprint(c) (isprint(c))
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#define lisxdigit(c) (isxdigit(c))
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#define ltolower(c) (tolower(c))
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#endif /* } */
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#endif
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