1/*
2 SPDX-FileCopyrightText: 2015 Gregor Mi <codestruct@posteo.org>
3
4 SPDX-License-Identifier: GPL-2.0-or-later
5*/
6
7#ifndef URLUTIL_P_H
8#define URLUTIL_P_H
9
10#include <QUrl>
11
12namespace KIO
13{
14namespace UrlUtil
15{
16/*
17 * Given that @p lastUrl is a child of @p currentUrl
18 * or put in other words:
19 * @p currentUrl is a parent in the hierarchy of @p lastUrl,
20 * then an URL 'currentUrl'/'childitem' is returned where
21 * 'childitem' is the first item in the hierarchy down to
22 * @p lastUrl. An example will illustrate this:
23
24 \verbatim
25 lastUrl : "/home/test/data/documents/muh/"
26 currentUrl : "/home/test/"
27 returns : "/home/test/data/"
28 \endverbatim
29
30 * In case @p currentUrl is a child of @p lastUrl, an invalid
31 * URL is returned:
32
33 \verbatim
34 lastUrl : "/home/"
35 currentUrl : "/home/test/"
36 returns : "" (invalid url)
37 \endverbatim
38
39 * In case both URLs are equal, an invalid URL is returned:
40
41 \verbatim
42 lastUrl : "/home/test/"
43 currentUrl : "/home/test/"
44 returns : "" (invalid url)
45 \endverbatim
46 */
47static QUrl firstChildUrl(const QUrl &lastUrl, const QUrl &currentUrl)
48{
49 const QUrl adjustedLastUrl = lastUrl.adjusted(options: QUrl::StripTrailingSlash);
50 const QUrl adjustedCurrentUrl = currentUrl.adjusted(options: QUrl::StripTrailingSlash);
51 if (!adjustedCurrentUrl.isParentOf(url: adjustedLastUrl)) {
52 return QUrl();
53 }
54
55 const QString childPath = adjustedLastUrl.path();
56 const QString parentPath = adjustedCurrentUrl.path();
57 // if the parent path is root "/"
58 // one char more is a valid path, otherwise "/" and another char are needed.
59 const int minIndex = (parentPath == QLatin1String("/")) ? 1 : 2;
60
61 // e.g. this would just be ok:
62 // childPath = /a len=2
63 // parentPath = / len=1
64 // childPath = /home/a len=7
65 // parentPath = /home len=5
66
67 if (childPath.length() < (parentPath.length() + minIndex)) {
68 return QUrl();
69 }
70
71 const int idx2 = childPath.indexOf(ch: QLatin1Char('/'), from: parentPath.length() + minIndex);
72 // parentPath = /home
73 // childPath = /home/a
74 // idx = -1
75 // => len2 = 7
76 //
77 // childPath = /homa/a/b
78 // idx = 7
79 // => len2 = 7
80 const int len2 = (idx2 < 0) ? childPath.length() : idx2;
81
82 const QString path3 = childPath.left(n: len2);
83
84 QUrl res = lastUrl; // keeps the scheme (e.g. file://)
85 res.setPath(path: path3);
86 return res;
87}
88}
89}
90
91#endif
92

source code of kio/src/gui/urlutil_p.h