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1 /* $XFree86: xc/programs/xterm/wcwidth.character,v 1.3 2001/07/29 22:08:16 tsi Exp $ */ |
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2 /* |
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3 * This is an implementation of wcwidth() and wcswidth() as defined in |
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4 * "The Single UNIX Specification, Version 2, The Open Group, 1997" |
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5 * <http://www.UNIX-systems.org/online.html> |
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6 * |
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7 * Markus Kuhn -- 2001-01-12 -- public domain |
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8 */ |
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9 |
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10 #include "konsole_wcwidth.h" |
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11 |
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12 struct interval { |
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13 unsigned short first; |
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14 unsigned short last; |
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15 }; |
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16 |
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17 /* auxiliary function for binary search in interval table */ |
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18 static int bisearch(quint16 ucs, const struct interval *table, int max) { |
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19 int min = 0; |
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20 int mid; |
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21 |
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22 if (ucs < table[0].first || ucs > table[max].last) |
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23 return 0; |
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24 while (max >= min) { |
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25 mid = (min + max) / 2; |
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26 if (ucs > table[mid].last) |
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27 min = mid + 1; |
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28 else if (ucs < table[mid].first) |
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29 max = mid - 1; |
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30 else |
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31 return 1; |
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32 } |
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33 |
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34 return 0; |
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35 } |
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36 |
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37 |
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38 /* The following functions define the column width of an ISO 10646 |
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39 * character as follows: |
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40 * |
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41 * - The null character (U+0000) has a column width of 0. |
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42 * |
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43 * - Other C0/C1 control characters and DEL will lead to a return |
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44 * value of -1. |
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45 * |
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46 * - Non-spacing and enclosing combining characters (general |
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47 * category code Mn or Me in the Unicode database) have a |
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48 * column width of 0. |
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49 * |
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50 * - Other format characters (general category code Cf in the Unicode |
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51 * database) and ZERO WIDTH SPACE (U+200B) have a column width of 0. |
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52 * |
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53 * - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF) |
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54 * have a column width of 0. |
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55 * |
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56 * - Spacing characters in the East Asian Wide (W) or East Asian |
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57 * FullWidth (F) category as defined in Unicode Technical |
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58 * Report #11 have a column width of 2. |
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59 * |
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60 * - All remaining characters (including all printable |
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61 * ISO 8859-1 and WGL4 characters, Unicode control characters, |
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62 * etc.) have a column width of 1. |
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63 * |
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64 * This implementation assumes that quint16 characters are encoded |
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65 * in ISO 10646. |
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66 */ |
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67 |
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68 int konsole_wcwidth(quint16 ucs) |
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69 { |
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70 /* sorted list of non-overlapping intervals of non-spacing characters */ |
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71 static const struct interval combining[] = { |
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72 { 0x0300, 0x034E }, { 0x0360, 0x0362 }, { 0x0483, 0x0486 }, |
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73 { 0x0488, 0x0489 }, { 0x0591, 0x05A1 }, { 0x05A3, 0x05B9 }, |
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74 { 0x05BB, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 }, |
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75 { 0x05C4, 0x05C4 }, { 0x064B, 0x0655 }, { 0x0670, 0x0670 }, |
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76 { 0x06D6, 0x06E4 }, { 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED }, |
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77 { 0x070F, 0x070F }, { 0x0711, 0x0711 }, { 0x0730, 0x074A }, |
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78 { 0x07A6, 0x07B0 }, { 0x0901, 0x0902 }, { 0x093C, 0x093C }, |
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79 { 0x0941, 0x0948 }, { 0x094D, 0x094D }, { 0x0951, 0x0954 }, |
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80 { 0x0962, 0x0963 }, { 0x0981, 0x0981 }, { 0x09BC, 0x09BC }, |
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81 { 0x09C1, 0x09C4 }, { 0x09CD, 0x09CD }, { 0x09E2, 0x09E3 }, |
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82 { 0x0A02, 0x0A02 }, { 0x0A3C, 0x0A3C }, { 0x0A41, 0x0A42 }, |
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83 { 0x0A47, 0x0A48 }, { 0x0A4B, 0x0A4D }, { 0x0A70, 0x0A71 }, |
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84 { 0x0A81, 0x0A82 }, { 0x0ABC, 0x0ABC }, { 0x0AC1, 0x0AC5 }, |
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85 { 0x0AC7, 0x0AC8 }, { 0x0ACD, 0x0ACD }, { 0x0B01, 0x0B01 }, |
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86 { 0x0B3C, 0x0B3C }, { 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B43 }, |
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87 { 0x0B4D, 0x0B4D }, { 0x0B56, 0x0B56 }, { 0x0B82, 0x0B82 }, |
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88 { 0x0BC0, 0x0BC0 }, { 0x0BCD, 0x0BCD }, { 0x0C3E, 0x0C40 }, |
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89 { 0x0C46, 0x0C48 }, { 0x0C4A, 0x0C4D }, { 0x0C55, 0x0C56 }, |
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90 { 0x0CBF, 0x0CBF }, { 0x0CC6, 0x0CC6 }, { 0x0CCC, 0x0CCD }, |
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91 { 0x0D41, 0x0D43 }, { 0x0D4D, 0x0D4D }, { 0x0DCA, 0x0DCA }, |
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92 { 0x0DD2, 0x0DD4 }, { 0x0DD6, 0x0DD6 }, { 0x0E31, 0x0E31 }, |
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93 { 0x0E34, 0x0E3A }, { 0x0E47, 0x0E4E }, { 0x0EB1, 0x0EB1 }, |
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94 { 0x0EB4, 0x0EB9 }, { 0x0EBB, 0x0EBC }, { 0x0EC8, 0x0ECD }, |
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95 { 0x0F18, 0x0F19 }, { 0x0F35, 0x0F35 }, { 0x0F37, 0x0F37 }, |
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96 { 0x0F39, 0x0F39 }, { 0x0F71, 0x0F7E }, { 0x0F80, 0x0F84 }, |
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97 { 0x0F86, 0x0F87 }, { 0x0F90, 0x0F97 }, { 0x0F99, 0x0FBC }, |
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98 { 0x0FC6, 0x0FC6 }, { 0x102D, 0x1030 }, { 0x1032, 0x1032 }, |
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99 { 0x1036, 0x1037 }, { 0x1039, 0x1039 }, { 0x1058, 0x1059 }, |
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100 { 0x1160, 0x11FF }, { 0x17B7, 0x17BD }, { 0x17C6, 0x17C6 }, |
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101 { 0x17C9, 0x17D3 }, { 0x180B, 0x180E }, { 0x18A9, 0x18A9 }, |
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102 { 0x200B, 0x200F }, { 0x202A, 0x202E }, { 0x206A, 0x206F }, |
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103 { 0x20D0, 0x20E3 }, { 0x302A, 0x302F }, { 0x3099, 0x309A }, |
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104 { 0xFB1E, 0xFB1E }, { 0xFE20, 0xFE23 }, { 0xFEFF, 0xFEFF }, |
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105 { 0xFFF9, 0xFFFB } |
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106 }; |
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107 |
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108 /* test for 8-bit control characters */ |
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109 if (ucs == 0) |
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110 return 0; |
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111 if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0)) |
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112 return -1; |
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113 |
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114 /* binary search in table of non-spacing characters */ |
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115 if (bisearch(ucs, combining, |
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116 sizeof(combining) / sizeof(struct interval) - 1)) |
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117 return 0; |
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118 |
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119 /* if we arrive here, ucs is not a combining or C0/C1 control character */ |
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120 |
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121 return 1 + |
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122 (ucs >= 0x1100 && |
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123 (ucs <= 0x115f || /* Hangul Jamo init. consonants */ |
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124 (ucs >= 0x2e80 && ucs <= 0xa4cf && (ucs & ~0x0011) != 0x300a && |
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125 ucs != 0x303f) || /* CJK ... Yi */ |
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126 (ucs >= 0xac00 && ucs <= 0xd7a3) || /* Hangul Syllables */ |
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127 (ucs >= 0xf900 && ucs <= 0xfaff) || /* CJK Compatibility Ideographs */ |
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128 (ucs >= 0xfe30 && ucs <= 0xfe6f) || /* CJK Compatibility Forms */ |
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129 (ucs >= 0xff00 && ucs <= 0xff5f) || /* Fullwidth Forms */ |
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130 (ucs >= 0xffe0 && ucs <= 0xffe6) /* do not compare UINT16 with 0x20000 || |
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131 (ucs >= 0x20000 && ucs <= 0x2ffff) */)); |
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132 } |
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133 |
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134 #if 0 |
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135 /* |
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136 * The following function is the same as konsole_wcwidth(), except that |
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137 * spacing characters in the East Asian Ambiguous (A) category as |
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138 * defined in Unicode Technical Report #11 have a column width of 2. |
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139 * This experimental variant might be useful for users of CJK legacy |
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140 * encodings who want to migrate to UCS. It is not otherwise |
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141 * recommended for general use. |
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142 */ |
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143 int konsole_wcwidth_cjk(quint16 ucs) |
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144 { |
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145 /* sorted list of non-overlapping intervals of East Asian Ambiguous |
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146 * characters */ |
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147 static const struct interval ambiguous[] = { |
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148 { 0x00A1, 0x00A1 }, { 0x00A4, 0x00A4 }, { 0x00A7, 0x00A8 }, |
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149 { 0x00AA, 0x00AA }, { 0x00AD, 0x00AD }, { 0x00B0, 0x00B4 }, |
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150 { 0x00B6, 0x00BA }, { 0x00BC, 0x00BF }, { 0x00C6, 0x00C6 }, |
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151 { 0x00D0, 0x00D0 }, { 0x00D7, 0x00D8 }, { 0x00DE, 0x00E1 }, |
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152 { 0x00E6, 0x00E6 }, { 0x00E8, 0x00EA }, { 0x00EC, 0x00ED }, |
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153 { 0x00F0, 0x00F0 }, { 0x00F2, 0x00F3 }, { 0x00F7, 0x00FA }, |
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154 { 0x00FC, 0x00FC }, { 0x00FE, 0x00FE }, { 0x0101, 0x0101 }, |
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155 { 0x0111, 0x0111 }, { 0x0113, 0x0113 }, { 0x011B, 0x011B }, |
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156 { 0x0126, 0x0127 }, { 0x012B, 0x012B }, { 0x0131, 0x0133 }, |
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157 { 0x0138, 0x0138 }, { 0x013F, 0x0142 }, { 0x0144, 0x0144 }, |
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158 { 0x0148, 0x014A }, { 0x014D, 0x014D }, { 0x0152, 0x0153 }, |
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159 { 0x0166, 0x0167 }, { 0x016B, 0x016B }, { 0x01CE, 0x01CE }, |
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160 { 0x01D0, 0x01D0 }, { 0x01D2, 0x01D2 }, { 0x01D4, 0x01D4 }, |
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161 { 0x01D6, 0x01D6 }, { 0x01D8, 0x01D8 }, { 0x01DA, 0x01DA }, |
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162 { 0x01DC, 0x01DC }, { 0x0251, 0x0251 }, { 0x0261, 0x0261 }, |
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163 { 0x02C7, 0x02C7 }, { 0x02C9, 0x02CB }, { 0x02CD, 0x02CD }, |
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164 { 0x02D0, 0x02D0 }, { 0x02D8, 0x02DB }, { 0x02DD, 0x02DD }, |
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165 { 0x0391, 0x03A1 }, { 0x03A3, 0x03A9 }, { 0x03B1, 0x03C1 }, |
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166 { 0x03C3, 0x03C9 }, { 0x0401, 0x0401 }, { 0x0410, 0x044F }, |
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167 { 0x0451, 0x0451 }, { 0x2010, 0x2010 }, { 0x2013, 0x2016 }, |
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168 { 0x2018, 0x2019 }, { 0x201C, 0x201D }, { 0x2020, 0x2021 }, |
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169 { 0x2025, 0x2027 }, { 0x2030, 0x2030 }, { 0x2032, 0x2033 }, |
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170 { 0x2035, 0x2035 }, { 0x203B, 0x203B }, { 0x2074, 0x2074 }, |
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171 { 0x207F, 0x207F }, { 0x2081, 0x2084 }, { 0x20AC, 0x20AC }, |
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172 { 0x2103, 0x2103 }, { 0x2105, 0x2105 }, { 0x2109, 0x2109 }, |
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173 { 0x2113, 0x2113 }, { 0x2121, 0x2122 }, { 0x2126, 0x2126 }, |
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174 { 0x212B, 0x212B }, { 0x2154, 0x2155 }, { 0x215B, 0x215B }, |
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175 { 0x215E, 0x215E }, { 0x2160, 0x216B }, { 0x2170, 0x2179 }, |
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176 { 0x2190, 0x2199 }, { 0x21D2, 0x21D2 }, { 0x21D4, 0x21D4 }, |
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177 { 0x2200, 0x2200 }, { 0x2202, 0x2203 }, { 0x2207, 0x2208 }, |
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178 { 0x220B, 0x220B }, { 0x220F, 0x220F }, { 0x2211, 0x2211 }, |
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179 { 0x2215, 0x2215 }, { 0x221A, 0x221A }, { 0x221D, 0x2220 }, |
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180 { 0x2223, 0x2223 }, { 0x2225, 0x2225 }, { 0x2227, 0x222C }, |
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181 { 0x222E, 0x222E }, { 0x2234, 0x2237 }, { 0x223C, 0x223D }, |
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182 { 0x2248, 0x2248 }, { 0x224C, 0x224C }, { 0x2252, 0x2252 }, |
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183 { 0x2260, 0x2261 }, { 0x2264, 0x2267 }, { 0x226A, 0x226B }, |
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184 { 0x226E, 0x226F }, { 0x2282, 0x2283 }, { 0x2286, 0x2287 }, |
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185 { 0x2295, 0x2295 }, { 0x2299, 0x2299 }, { 0x22A5, 0x22A5 }, |
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186 { 0x22BF, 0x22BF }, { 0x2312, 0x2312 }, { 0x2460, 0x24BF }, |
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187 { 0x24D0, 0x24E9 }, { 0x2500, 0x254B }, { 0x2550, 0x2574 }, |
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188 { 0x2580, 0x258F }, { 0x2592, 0x2595 }, { 0x25A0, 0x25A1 }, |
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189 { 0x25A3, 0x25A9 }, { 0x25B2, 0x25B3 }, { 0x25B6, 0x25B7 }, |
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190 { 0x25BC, 0x25BD }, { 0x25C0, 0x25C1 }, { 0x25C6, 0x25C8 }, |
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191 { 0x25CB, 0x25CB }, { 0x25CE, 0x25D1 }, { 0x25E2, 0x25E5 }, |
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192 { 0x25EF, 0x25EF }, { 0x2605, 0x2606 }, { 0x2609, 0x2609 }, |
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193 { 0x260E, 0x260F }, { 0x261C, 0x261C }, { 0x261E, 0x261E }, |
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194 { 0x2640, 0x2640 }, { 0x2642, 0x2642 }, { 0x2660, 0x2661 }, |
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195 { 0x2663, 0x2665 }, { 0x2667, 0x266A }, { 0x266C, 0x266D }, |
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196 { 0x266F, 0x266F }, { 0x300A, 0x300B }, { 0x301A, 0x301B }, |
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197 { 0xE000, 0xF8FF }, { 0xFFFD, 0xFFFD } |
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198 }; |
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199 |
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200 /* binary search in table of non-spacing characters */ |
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201 if (bisearch(ucs, ambiguous, |
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202 sizeof(ambiguous) / sizeof(struct interval) - 1)) |
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203 return 2; |
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204 |
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205 return konsole_wcwidth(ucs); |
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206 } |
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207 #endif |
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208 |
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209 // single byte char: +1, multi byte char: +2 |
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210 int string_width( const QString &txt ) |
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211 { |
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212 int w = 0; |
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213 for ( int i = 0; i < txt.length(); ++i ) |
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214 w += konsole_wcwidth( txt[ i ].unicode() ); |
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215 return w; |
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216 } |
