liblua/lctype.h

   1 /*
   2 ** $Id: lctype.h,v 1.12 2011/07/15 12:50:29 roberto Exp $
   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 ** this 'ltolower' only works for alphabetic characters
  66 */
  67 #define ltolower(c)     ((c) | ('A' ^ 'a'))
  68
  69
  70 /* two more entries for 0 and -1 (EOZ) */
  71 LUAI_DDEC const lu_byte luai_ctype_[UCHAR_MAX + 2];
  72
  73
  74 #else                   /* }{ */
  75
  76 /*
  77 ** use standard C ctypes
  78 */
  79
  80 #include <ctype.h>
  81
  82
  83 #define lislalpha(c)    (isalpha(c) || (c) == '_')
  84 #define lislalnum(c)    (isalnum(c) || (c) == '_')
  85 #define lisdigit(c)     (isdigit(c))
  86 #define lisspace(c)     (isspace(c))
  87 #define lisprint(c)     (isprint(c))
  88 #define lisxdigit(c)    (isxdigit(c))
  89
  90 #define ltolower(c)     (tolower(c))
  91
  92 #endif                  /* } */
  93
  94 #endif
  95