kdecore/localization/common_helpers.cpp

   1 /*  This file is part of the KDE libraries
   2     Copyright (C) 2008 Chusslove Illich <caslav.ilic@gmx.net>
   3
   4     This library is free software; you can redistribute it and/or
   5     modify it under the terms of the GNU Library General Public
   6     License as published by the Free Software Foundation; either
   7     version 2 of the License, or (at your option) any later version.
   8
   9     This library is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12     Library General Public License for more details.
  13
  14     You should have received a copy of the GNU Library General Public License
  15     along with this library; see the file COPYING.LIB.  If not, write to
  16     the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17     Boston, MA 02110-1301, USA.
  18 */
  19
  20 #include <common_helpers_p.h>
  21
  22 // If pos points to alphanumeric X in "...(X)...", which is preceded or
  23 // followed only by non-alphanumerics, then "(X)" gets removed.
  24 static QString removeReducedCJKAccMark (const QString &label, int pos)
  25 {
  26     if (   pos > 0 && pos + 1 < label.length()
  27         && label[pos - 1] == '(' && label[pos + 1] == ')'
  28         && label[pos].isLetterOrNumber())
  29     {
  30         // Check if at start or end, ignoring non-alphanumerics.
  31         int len = label.length();
  32         int p1 = pos - 2;
  33         while (p1 >= 0 && !label[p1].isLetterOrNumber()) {
  34             --p1;
  35         }
  36         ++p1;
  37         int p2 = pos + 2;
  38         while (p2 < len && !label[p2].isLetterOrNumber()) {
  39             ++p2;
  40         }
  41         --p2;
  42
  43         if (p1 == 0) {
  44             return label.left(pos - 1) + label.mid(p2 + 1);
  45         } else if (p2 + 1 == len) {
  46             return label.left(p1) + label.mid(pos + 2);
  47         }
  48     }
  49     return label;
  50 }
  51
  52 QString removeAcceleratorMarker (const QString &label_)
  53 {
  54     QString label = label_;
  55
  56     int p = 0;
  57     bool accmarkRemoved = false;
  58     while (true) {
  59         p = label.indexOf('&', p);
  60         if (p < 0 || p + 1 == label.length()) {
  61             break;
  62         }
  63
  64         if (label[p + 1].isLetterOrNumber()) {
  65             // Valid accelerator.
  66             label = label.left(p) + label.mid(p + 1);
  67
  68             // May have been an accelerator in CJK-style "(&X)"
  69             // at the start or end of text.
  70             label = removeReducedCJKAccMark(label, p);
  71
  72             accmarkRemoved = true;
  73         } else if (label[p + 1] == '&') {
  74             // Escaped accelerator marker.
  75             label = label.left(p) + label.mid(p + 1);
  76         }
  77
  78         ++p;
  79     }
  80
  81     // If no marker was removed, and there are CJK characters in the label,
  82     // also try to remove reduced CJK marker -- something may have removed
  83     // ampersand beforehand.
  84     if (!accmarkRemoved) {
  85         bool hasCJK = false;
  86         foreach (const QChar &c, label) {
  87             if (c.unicode() >= 0x2e00) { // rough, but should be sufficient
  88                 hasCJK = true;
  89                 break;
  90             }
  91         }
  92         if (hasCJK) {
  93             p = 0;
  94             while (true) {
  95                 p = label.indexOf('(', p);
  96                 if (p < 0) {
  97                     break;
  98                 }
  99                 label = removeReducedCJKAccMark(label, p + 1);
 100                 ++p;
 101             }
 102         }
 103     }
 104
 105     return label;
 106 }