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1
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2 /*
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3 * Copyright (C) 2004-2005 by Digital Mars, www.digitalmars.com
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4 * Written by Walter Bright
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5 *
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6 * This software is provided 'as-is', without any express or implied
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7 * warranty. In no event will the authors be held liable for any damages
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8 * arising from the use of this software.
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9 *
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10 * Permission is granted to anyone to use this software for any purpose,
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11 * including commercial applications, and to alter it and redistribute it
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12 * freely, in both source and binary form, subject to the following
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13 * restrictions:
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14 *
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15 * o The origin of this software must not be misrepresented; you must not
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16 * claim that you wrote the original software. If you use this software
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17 * in a product, an acknowledgment in the product documentation would be
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18 * appreciated but is not required.
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19 * o Altered source versions must be plainly marked as such, and must not
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20 * be misrepresented as being the original software.
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21 * o This notice may not be removed or altered from any source
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22 * distribution.
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23 */
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24
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25 // Simple ASCII char classification functions
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26
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27 module util.ctype;
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28
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29 int isalnum(dchar c) { return (c <= 0x7F) ? _ctype[c] & (_ALP|_DIG) : 0; }
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30 int isalpha(dchar c) { return (c <= 0x7F) ? _ctype[c] & (_ALP) : 0; }
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31 int iscntrl(dchar c) { return (c <= 0x7F) ? _ctype[c] & (_CTL) : 0; }
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32 int isdigit(dchar c) { return (c <= 0x7F) ? _ctype[c] & (_DIG) : 0; }
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33 int islower(dchar c) { return (c <= 0x7F) ? _ctype[c] & (_LC) : 0; }
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34 int ispunct(dchar c) { return (c <= 0x7F) ? _ctype[c] & (_PNC) : 0; }
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35 int isspace(dchar c) { return (c <= 0x7F) ? _ctype[c] & (_SPC) : 0; }
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36 int isupper(dchar c) { return (c <= 0x7F) ? _ctype[c] & (_UC) : 0; }
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37 int isxdigit(dchar c) { return (c <= 0x7F) ? _ctype[c] & (_HEX) : 0; }
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38 int isgraph(dchar c) { return (c <= 0x7F) ? _ctype[c] & (_ALP|_DIG|_PNC) : 0; }
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39 int isprint(dchar c) { return (c <= 0x7F) ? _ctype[c] & (_ALP|_DIG|_PNC|_BLK) : 0; }
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40 int isascii(dchar c) { return c <= 0x7F; }
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41
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42 dchar tolower(dchar c)
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43 out (result)
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44 {
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45 assert(!isupper(result));
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46 }
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47 body
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48 {
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49 return isupper(c) ? c + (cast(dchar)'a' - 'A') : c;
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50 }
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51
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52 dchar toupper(dchar c)
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53 out (result)
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54 {
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55 assert(!islower(result));
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56 }
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57 body
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58 {
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59 return islower(c) ? c - (cast(dchar)'a' - 'A') : c;
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60 }
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61
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62 private:
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63
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64 enum
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65 {
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66 _SPC = 8,
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67 _CTL = 0x20,
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68 _BLK = 0x40,
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69 _HEX = 0x80,
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70 _UC = 1,
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71 _LC = 2,
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72 _PNC = 0x10,
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73 _DIG = 4,
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74 _ALP = _UC|_LC,
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75 }
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76
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77 ubyte _ctype[128] =
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78 [
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79 _CTL,_CTL,_CTL,_CTL,_CTL,_CTL,_CTL,_CTL,
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80 _CTL,_CTL|_SPC,_CTL|_SPC,_CTL|_SPC,_CTL|_SPC,_CTL|_SPC,_CTL,_CTL,
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81 _CTL,_CTL,_CTL,_CTL,_CTL,_CTL,_CTL,_CTL,
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82 _CTL,_CTL,_CTL,_CTL,_CTL,_CTL,_CTL,_CTL,
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83 _SPC|_BLK,_PNC,_PNC,_PNC,_PNC,_PNC,_PNC,_PNC,
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84 _PNC,_PNC,_PNC,_PNC,_PNC,_PNC,_PNC,_PNC,
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85 _DIG|_HEX,_DIG|_HEX,_DIG|_HEX,_DIG|_HEX,_DIG|_HEX,
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86 _DIG|_HEX,_DIG|_HEX,_DIG|_HEX,_DIG|_HEX,_DIG|_HEX,
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87 _PNC,_PNC,_PNC,_PNC,_PNC,_PNC,
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88 _PNC,_UC|_HEX,_UC|_HEX,_UC|_HEX,_UC|_HEX,_UC|_HEX,_UC|_HEX,_UC,
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89 _UC,_UC,_UC,_UC,_UC,_UC,_UC,_UC,
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90 _UC,_UC,_UC,_UC,_UC,_UC,_UC,_UC,
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91 _UC,_UC,_UC,_PNC,_PNC,_PNC,_PNC,_PNC,
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92 _PNC,_LC|_HEX,_LC|_HEX,_LC|_HEX,_LC|_HEX,_LC|_HEX,_LC|_HEX,_LC,
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93 _LC,_LC,_LC,_LC,_LC,_LC,_LC,_LC,
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94 _LC,_LC,_LC,_LC,_LC,_LC,_LC,_LC,
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95 _LC,_LC,_LC,_PNC,_PNC,_PNC,_PNC,_CTL
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96 ];
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97
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98
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99 unittest
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100 {
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101 assert(isspace(' '));
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102 assert(!isspace('z'));
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103 assert(toupper('a') == 'A');
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104 assert(tolower('Q') == 'q');
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105 assert(!isxdigit('G'));
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106 }
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