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1866
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1 /*
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2 ** $Id: lctype.h,v 1.12 2011/07/15 12:50:29 roberto Exp $
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3 ** 'ctype' functions for Lua
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4 ** See Copyright Notice in lua.h
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5 */
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6
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7 #ifndef lctype_h
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8 #define lctype_h
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9
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10 #include "lua.h"
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11
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12
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13 /*
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14 ** WARNING: the functions defined here do not necessarily correspond
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15 ** to the similar functions in the standard C ctype.h. They are
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16 ** optimized for the specific needs of Lua
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17 */
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18
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19 #if !defined(LUA_USE_CTYPE)
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20
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21 #if 'A' == 65 && '0' == 48
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22 /* ASCII case: can use its own tables; faster and fixed */
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23 #define LUA_USE_CTYPE 0
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24 #else
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25 /* must use standard C ctype */
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26 #define LUA_USE_CTYPE 1
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27 #endif
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28
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29 #endif
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30
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31
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32 #if !LUA_USE_CTYPE /* { */
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33
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34 #include <limits.h>
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35
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36 #include "llimits.h"
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37
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38
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39 #define ALPHABIT 0
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40 #define DIGITBIT 1
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41 #define PRINTBIT 2
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42 #define SPACEBIT 3
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43 #define XDIGITBIT 4
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44
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45
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46 #define MASK(B) (1 << (B))
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47
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48
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49 /*
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50 ** add 1 to char to allow index -1 (EOZ)
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51 */
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52 #define testprop(c,p) (luai_ctype_[(c)+1] & (p))
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53
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54 /*
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55 ** 'lalpha' (Lua alphabetic) and 'lalnum' (Lua alphanumeric) both include '_'
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56 */
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57 #define lislalpha(c) testprop(c, MASK(ALPHABIT))
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58 #define lislalnum(c) testprop(c, (MASK(ALPHABIT) | MASK(DIGITBIT)))
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59 #define lisdigit(c) testprop(c, MASK(DIGITBIT))
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60 #define lisspace(c) testprop(c, MASK(SPACEBIT))
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61 #define lisprint(c) testprop(c, MASK(PRINTBIT))
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62 #define lisxdigit(c) testprop(c, MASK(XDIGITBIT))
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63
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64 /*
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65 ** this 'ltolower' only works for alphabetic characters
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66 */
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67 #define ltolower(c) ((c) | ('A' ^ 'a'))
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68
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69
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70 /* two more entries for 0 and -1 (EOZ) */
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71 LUAI_DDEC const lu_byte luai_ctype_[UCHAR_MAX + 2];
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72
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73
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74 #else /* }{ */
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75
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76 /*
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77 ** use standard C ctypes
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78 */
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79
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80 #include <ctype.h>
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81
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82
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83 #define lislalpha(c) (isalpha(c) || (c) == '_')
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84 #define lislalnum(c) (isalnum(c) || (c) == '_')
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85 #define lisdigit(c) (isdigit(c))
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86 #define lisspace(c) (isspace(c))
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87 #define lisprint(c) (isprint(c))
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88 #define lisxdigit(c) (isxdigit(c))
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89
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90 #define ltolower(c) (tolower(c))
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91
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92 #endif /* } */
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93
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94 #endif
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95
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