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KDECore

common_helpers.cpp

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00001 /*  This file is part of the KDE libraries
00002     Copyright (C) 2008 Chusslove Illich <caslav.ilic@gmx.net>
00003 
00004     This library is free software; you can redistribute it and/or
00005     modify it under the terms of the GNU Library General Public
00006     License as published by the Free Software Foundation; either
00007     version 2 of the License, or (at your option) any later version.
00008 
00009     This library is distributed in the hope that it will be useful,
00010     but WITHOUT ANY WARRANTY; without even the implied warranty of
00011     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012     Library General Public License for more details.
00013 
00014     You should have received a copy of the GNU Library General Public License
00015     along with this library; see the file COPYING.LIB.  If not, write to
00016     the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
00017     Boston, MA 02110-1301, USA.
00018 */
00019 
00020 #include <common_helpers_p.h>
00021 
00022 // If pos points to alphanumeric X in "...(X)...", which is preceded or
00023 // followed only by non-alphanumerics, then "(X)" gets removed.
00024 static QString removeReducedCJKAccMark (const QString &label, int pos)
00025 {
00026     if (   pos > 0 && pos + 1 < label.length()
00027         && label[pos - 1] == '(' && label[pos + 1] == ')'
00028         && label[pos].isLetterOrNumber())
00029     {
00030         // Check if at start or end, ignoring non-alphanumerics.
00031         int len = label.length();
00032         int p1 = pos - 2;
00033         while (p1 >= 0 && !label[p1].isLetterOrNumber()) {
00034             --p1;
00035         }
00036         ++p1;
00037         int p2 = pos + 2;
00038         while (p2 < len && !label[p2].isLetterOrNumber()) {
00039             ++p2;
00040         }
00041         --p2;
00042 
00043         if (p1 == 0) {
00044             return label.left(pos - 1) + label.mid(p2 + 1);
00045         } else if (p2 + 1 == len) {
00046             return label.left(p1) + label.mid(pos + 2);
00047         }
00048     }
00049     return label;
00050 }
00051 
00052 QString removeAcceleratorMarker (const QString &label_)
00053 {
00054     QString label = label_;
00055 
00056     int p = 0;
00057     bool accmarkRemoved = false;
00058     while (true) {
00059         p = label.indexOf('&', p);
00060         if (p < 0 || p + 1 == label.length()) {
00061             break;
00062         }
00063 
00064         if (label[p + 1].isLetterOrNumber()) {
00065             // Valid accelerator.
00066             label = label.left(p) + label.mid(p + 1);
00067 
00068             // May have been an accelerator in CJK-style "(&X)"
00069             // at the start or end of text.
00070             label = removeReducedCJKAccMark(label, p);
00071 
00072             accmarkRemoved = true;
00073         } else if (label[p + 1] == '&') {
00074             // Escaped accelerator marker.
00075             label = label.left(p) + label.mid(p + 1);
00076         }
00077 
00078         ++p;
00079     }
00080 
00081     // If no marker was removed, and there are CJK characters in the label,
00082     // also try to remove reduced CJK marker -- something may have removed
00083     // ampersand beforehand.
00084     if (!accmarkRemoved) {
00085         bool hasCJK = false;
00086         foreach (const QChar &c, label) {
00087             if (c.unicode() >= 0x2e00) { // rough, but should be sufficient
00088                 hasCJK = true;
00089                 break;
00090             }
00091         }
00092         if (hasCJK) {
00093             p = 0;
00094             while (true) {
00095                 p = label.indexOf('(', p);
00096                 if (p < 0) {
00097                     break;
00098                 }
00099                 label = removeReducedCJKAccMark(label, p + 1);
00100                 ++p;
00101             }
00102         }
00103     }
00104 
00105     return label;
00106 }

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