1/* 2** $Id: lctype.h $ 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/* 66** In ASCII, this 'ltolower' is correct for alphabetic characters and 67** for '.'. That is enough for Lua needs. ('check_exp' ensures that 68** the character either is an upper-case letter or is unchanged by 69** the transformation, which holds for lower-case letters and '.'.) 70*/ 71#define ltolower(c) \ 72 check_exp(('A' <= (c) && (c) <= 'Z') || (c) == ((c) | ('A' ^ 'a')), \ 73 (c) | ('A' ^ 'a')) 74 75 76/* one entry for each character and for -1 (EOZ) */ 77LUAI_DDEC(const lu_byte luai_ctype_[UCHAR_MAX + 2];) 78 79 80#else /* }{ */ 81 82/* 83** use standard C ctypes 84*/ 85 86#include <ctype.h> 87 88 89#define lislalpha(c) (isalpha(c) || (c) == '_') 90#define lislalnum(c) (isalnum(c) || (c) == '_') 91#define lisdigit(c) (isdigit(c)) 92#define lisspace(c) (isspace(c)) 93#define lisprint(c) (isprint(c)) 94#define lisxdigit(c) (isxdigit(c)) 95 96#define ltolower(c) (tolower(c)) 97 98#endif /* } */ 99 100#endif 101 102