KI18n

common_helpers.cpp
1 /* This file is part of the KDE libraries
2  SPDX-FileCopyrightText: 2008 Chusslove Illich <[email protected]>
3 
4  SPDX-License-Identifier: LGPL-2.0-or-later
5 */
6 
7 #include <common_helpers_p.h>
8 
9 // If pos points to alphanumeric X in "...(X)...", which is preceded or
10 // followed only by non-alphanumerics, then "(X)" gets removed.
11 static QString removeReducedCJKAccMark(const QString &label, int pos)
12 {
13  if (pos > 0 && pos + 1 < label.length() //
14  && label[pos - 1] == QLatin1Char('(') //
15  && label[pos + 1] == QLatin1Char(')') //
16  && label[pos].isLetterOrNumber()) {
17  // Check if at start or end, ignoring non-alphanumerics.
18  int len = label.length();
19  int p1 = pos - 2;
20  while (p1 >= 0 && !label[p1].isLetterOrNumber()) {
21  --p1;
22  }
23  ++p1;
24  int p2 = pos + 2;
25  while (p2 < len && !label[p2].isLetterOrNumber()) {
26  ++p2;
27  }
28  --p2;
29 
30  const QStringView labelView(label);
31  if (p1 == 0) {
32  return labelView.left(pos - 1) + labelView.mid(p2 + 1);
33  } else if (p2 + 1 == len) {
34  return labelView.left(p1) + labelView.mid(pos + 2);
35  }
36  }
37  return label;
38 }
39 
40 QString removeAcceleratorMarker(const QString &label_)
41 {
42  QString label = label_;
43 
44  int p = 0;
45  bool accmarkRemoved = false;
46  while (true) {
47  p = label.indexOf(QLatin1Char('&'), p);
48  if (p < 0 || p + 1 == label.length()) {
49  break;
50  }
51 
52  const QStringView labelView(label);
53  const QChar marker = label.at(p + 1);
54  if (marker.isLetterOrNumber()) {
55  // Valid accelerator.
56  label = labelView.left(p) + labelView.mid(p + 1);
57 
58  // May have been an accelerator in CJK-style "(&X)"
59  // at the start or end of text.
60  label = removeReducedCJKAccMark(label, p);
61 
62  accmarkRemoved = true;
63  } else if (marker == QLatin1Char('&')) {
64  // Escaped accelerator marker.
65  label = labelView.left(p) + labelView.mid(p + 1);
66  }
67 
68  ++p;
69  }
70 
71  // If no marker was removed, and there are CJK characters in the label,
72  // also try to remove reduced CJK marker -- something may have removed
73  // ampersand beforehand.
74  if (!accmarkRemoved) {
75  bool hasCJK = false;
76  for (const QChar c : std::as_const(label)) {
77  if (c.unicode() >= 0x2e00) { // rough, but should be sufficient
78  hasCJK = true;
79  break;
80  }
81  }
82  if (hasCJK) {
83  p = 0;
84  while (true) {
85  p = label.indexOf(QLatin1Char('('), p);
86  if (p < 0) {
87  break;
88  }
89  label = removeReducedCJKAccMark(label, p + 1);
90  ++p;
91  }
92  }
93  }
94 
95  return label;
96 }
bool isLetterOrNumber() const const
int length() const const
int indexOf(QChar ch, int from, Qt::CaseSensitivity cs) const const
QString label(StandardShortcut id)
QString left(int n) const const
const QChar at(int position) const const
QString mid(int position, int n) const const
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