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annotate lphobos/std/ctype.d @ 883:b52d5de7783f

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GC defines and linkage changes.
author Christian Kamm <kamm incasoftware de>
date Thu, 08 Jan 2009 18:20:02 +0100
parents fd32135dca3e
children
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86
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1 /*
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2 * Placed into the Public Domain.
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3 * Digital Mars, www.digitalmars.com
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4 * Written by Walter Bright
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5 */
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6
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7 /**
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8 * Simple ASCII character classification functions.
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9 * For Unicode classification, see $(LINK2 std_uni.html, std.uni).
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10 * References:
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11 * $(LINK2 http://www.digitalmars.com/d/ascii-table.html, ASCII Table),
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12 * $(LINK2 http://en.wikipedia.org/wiki/Ascii, Wikipedia)
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13 * Macros:
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14 * WIKI=Phobos/StdCtype
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15 */
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16
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17 module std.ctype;
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18
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19 /**
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20 * Returns !=0 if c is a letter in the range (0..9, a..z, A..Z).
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21 */
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22 int isalnum(dchar c) { return (c <= 0x7F) ? _ctype[c] & (_ALP|_DIG) : 0; }
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23
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24 /**
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25 * Returns !=0 if c is an ascii upper or lower case letter.
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26 */
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27 int isalpha(dchar c) { return (c <= 0x7F) ? _ctype[c] & (_ALP) : 0; }
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28
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29 /**
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30 * Returns !=0 if c is a control character.
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31 */
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32 int iscntrl(dchar c) { return (c <= 0x7F) ? _ctype[c] & (_CTL) : 0; }
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33
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34 /**
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35 * Returns !=0 if c is a digit.
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36 */
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37 int isdigit(dchar c) { return (c <= 0x7F) ? _ctype[c] & (_DIG) : 0; }
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38
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39 /**
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40 * Returns !=0 if c is lower case ascii letter.
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41 */
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42 int islower(dchar c) { return (c <= 0x7F) ? _ctype[c] & (_LC) : 0; }
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43
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44 /**
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45 * Returns !=0 if c is a punctuation character.
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46 */
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47 int ispunct(dchar c) { return (c <= 0x7F) ? _ctype[c] & (_PNC) : 0; }
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48
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49 /**
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50 * Returns !=0 if c is a space, tab, vertical tab, form feed,
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51 * carriage return, or linefeed.
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52 */
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53 int isspace(dchar c) { return (c <= 0x7F) ? _ctype[c] & (_SPC) : 0; }
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54
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55 /**
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56 * Returns !=0 if c is an upper case ascii character.
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57 */
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58 int isupper(dchar c) { return (c <= 0x7F) ? _ctype[c] & (_UC) : 0; }
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59
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60 /**
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61 * Returns !=0 if c is a hex digit (0..9, a..f, A..F).
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62 */
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63 int isxdigit(dchar c) { return (c <= 0x7F) ? _ctype[c] & (_HEX) : 0; }
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64
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65 /**
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66 * Returns !=0 if c is a printing character except for the space character.
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67 */
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68 int isgraph(dchar c) { return (c <= 0x7F) ? _ctype[c] & (_ALP|_DIG|_PNC) : 0; }
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69
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70 /**
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71 * Returns !=0 if c is a printing character including the space character.
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72 */
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73 int isprint(dchar c) { return (c <= 0x7F) ? _ctype[c] & (_ALP|_DIG|_PNC|_BLK) : 0; }
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74
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75 /**
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76 * Returns !=0 if c is in the ascii character set, i.e. in the range 0..0x7F.
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77 */
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78 int isascii(dchar c) { return c <= 0x7F; }
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79
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80
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81 /**
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82 * If c is an upper case ascii character,
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83 * return the lower case equivalent, otherwise return c.
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84 */
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85 dchar tolower(dchar c)
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86 out (result)
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87 {
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88 assert(!isupper(result));
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89 }
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90 body
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91 {
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92 return isupper(c) ? c + (cast(dchar)'a' - 'A') : c;
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93 }
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94
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95
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96 /**
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97 * If c is a lower case ascii character,
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98 * return the upper case equivalent, otherwise return c.
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99 */
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100 dchar toupper(dchar c)
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101 out (result)
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102 {
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103 assert(!islower(result));
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104 }
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105 body
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106 {
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107 return islower(c) ? c - (cast(dchar)'a' - 'A') : c;
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108 }
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109
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110 private:
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111
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112 enum
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113 {
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114 _SPC = 8,
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115 _CTL = 0x20,
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116 _BLK = 0x40,
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117 _HEX = 0x80,
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118 _UC = 1,
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119 _LC = 2,
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120 _PNC = 0x10,
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121 _DIG = 4,
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122 _ALP = _UC|_LC,
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123 }
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124
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125 ubyte _ctype[128] =
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126 [
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127 _CTL,_CTL,_CTL,_CTL,_CTL,_CTL,_CTL,_CTL,
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128 _CTL,_CTL|_SPC,_CTL|_SPC,_CTL|_SPC,_CTL|_SPC,_CTL|_SPC,_CTL,_CTL,
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129 _CTL,_CTL,_CTL,_CTL,_CTL,_CTL,_CTL,_CTL,
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130 _CTL,_CTL,_CTL,_CTL,_CTL,_CTL,_CTL,_CTL,
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131 _SPC|_BLK,_PNC,_PNC,_PNC,_PNC,_PNC,_PNC,_PNC,
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132 _PNC,_PNC,_PNC,_PNC,_PNC,_PNC,_PNC,_PNC,
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133 _DIG|_HEX,_DIG|_HEX,_DIG|_HEX,_DIG|_HEX,_DIG|_HEX,
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134 _DIG|_HEX,_DIG|_HEX,_DIG|_HEX,_DIG|_HEX,_DIG|_HEX,
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135 _PNC,_PNC,_PNC,_PNC,_PNC,_PNC,
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136 _PNC,_UC|_HEX,_UC|_HEX,_UC|_HEX,_UC|_HEX,_UC|_HEX,_UC|_HEX,_UC,
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137 _UC,_UC,_UC,_UC,_UC,_UC,_UC,_UC,
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138 _UC,_UC,_UC,_UC,_UC,_UC,_UC,_UC,
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139 _UC,_UC,_UC,_PNC,_PNC,_PNC,_PNC,_PNC,
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140 _PNC,_LC|_HEX,_LC|_HEX,_LC|_HEX,_LC|_HEX,_LC|_HEX,_LC|_HEX,_LC,
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141 _LC,_LC,_LC,_LC,_LC,_LC,_LC,_LC,
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142 _LC,_LC,_LC,_LC,_LC,_LC,_LC,_LC,
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143 _LC,_LC,_LC,_PNC,_PNC,_PNC,_PNC,_CTL
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144 ];
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145
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146
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147 unittest
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148 {
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149 assert(isspace(' '));
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150 assert(!isspace('z'));
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151 assert(toupper('a') == 'A');
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152 assert(tolower('Q') == 'q');
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153 assert(!isxdigit('G'));
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154 }