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) */ 77 LUAI_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