1 /*
2 SPDX-FileCopyrightText: 2012 Milian Wolff <mail@milianw.de>
3 SPDX-FileCopyrightText: 2015 Kevin Funk <kfunk@kde.org>
4
5 SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
6 */
7
8 #include "path.h"
9 #include "debug.h"
10
11 #include <QStringList>
12 #include <QDebug>
13
14 #include <language/util/kdevhash.h>
15
16 #include <algorithm>
17 #include <iterator>
18
19 using namespace KDevelop;
20
21 namespace {
22
isWindowsDriveLetter(const QString & segment)23 inline bool isWindowsDriveLetter(const QString& segment)
24 {
25 #ifdef Q_OS_WIN
26 return segment.size() == 2 && segment.at(0).isLetter() && segment.at(1) == QLatin1Char(':');
27 #else
28 Q_UNUSED(segment);
29 return false;
30 #endif
31 }
32
isAbsolutePath(const QString & path)33 inline bool isAbsolutePath(const QString& path)
34 {
35 if (path.startsWith(QLatin1Char('/'))) {
36 return true; // Even on Windows: Potentially a path of a remote URL
37 }
38
39 #ifdef Q_OS_WIN
40 return path.size() >= 2 && path.at(0).isLetter() && path.at(1) == QLatin1Char(':');
41 #else
42 return false;
43 #endif
44 }
45
46 }
47
toUrlOrLocalFile(const QUrl & url,QUrl::FormattingOptions options)48 QString KDevelop::toUrlOrLocalFile(const QUrl& url, QUrl::FormattingOptions options)
49 {
50 const auto str = url.toString(options | QUrl::PreferLocalFile);
51 #ifdef Q_OS_WIN
52 // potentially strip leading slash
53 if (url.isLocalFile() && !str.isEmpty() && str[0] == QLatin1Char('/')) {
54 return str.mid(1); // expensive copying, but we'd like toString(...) to properly format everything first
55 }
56 #endif
57 return str;
58 }
59
Path(const QString & pathOrUrl)60 Path::Path(const QString& pathOrUrl)
61 : Path(QUrl::fromUserInput(pathOrUrl, QString(), QUrl::DefaultResolution))
62 {
63 }
64
Path(const QUrl & url)65 Path::Path(const QUrl& url)
66 {
67 if (!url.isValid()) {
68 // empty or invalid Path
69 return;
70 }
71 // we do not support urls with:
72 // - fragments
73 // - sub urls
74 // - query
75 // nor do we support relative urls
76 if (url.hasFragment() || url.hasQuery() || url.isRelative() || url.path().isEmpty()) {
77 // invalid
78 qCWarning(UTIL) << "Path::init: invalid/unsupported Path encountered: " <<
79 qPrintable(url.toDisplayString(QUrl::PreferLocalFile));
80 return;
81 }
82
83 if (!url.isLocalFile()) {
84 // handle remote urls
85 QString urlPrefix = url.scheme() + QLatin1String("://");
86 const QString user = url.userName();
87 if (!user.isEmpty()) {
88 urlPrefix += user + QLatin1Char('@');
89 }
90 urlPrefix += url.host();
91 if (url.port() != -1) {
92 urlPrefix += QLatin1Char(':') + QString::number(url.port());
93 }
94 m_data << urlPrefix;
95 }
96
97 addPath(url.isLocalFile() ? url.toLocalFile() : url.path());
98
99 // support for root paths, they are valid but don't really contain any data
100 if (m_data.isEmpty() || (isRemote() && m_data.size() == 1)) {
101 m_data << QString();
102 }
103 }
104
Path(const Path & other,const QString & child)105 Path::Path(const Path& other, const QString& child)
106 : m_data(other.m_data)
107 {
108 if (isAbsolutePath(child)) {
109 // absolute path: only share the remote part of @p other
110 m_data.resize(isRemote() ? 1 : 0);
111 } else if (!other.isValid() && !child.isEmpty()) {
112 qCWarning(UTIL) << "Path::Path: tried to append relative path " << qPrintable(child) <<
113 " to invalid base";
114 return;
115 }
116 addPath(child);
117 }
118
generatePathOrUrl(bool onlyPath,bool isLocalFile,const QVector<QString> & data)119 static QString generatePathOrUrl(bool onlyPath, bool isLocalFile, const QVector<QString>& data)
120 {
121 // more or less a copy of QtPrivate::QStringList_join
122 const int size = data.size();
123
124 if (size == 0) {
125 return QString();
126 }
127
128 int totalLength = 0;
129 // separators: '/'
130 totalLength += size;
131
132 // skip Path segment if we only want the path
133 int start = (onlyPath && !isLocalFile) ? 1 : 0;
134
135 // path and url prefix
136 for (int i = start; i < size; ++i) {
137 totalLength += data.at(i).size();
138 }
139
140 // build string representation
141 QString res;
142 res.reserve(totalLength);
143
144 #ifdef Q_OS_WIN
145 if (start == 0 && isLocalFile) {
146 if(!data.at(0).endsWith(QLatin1Char(':'))) {
147 qCWarning(UTIL) << "Path::generatePathOrUrl: Invalid Windows drive encountered (expected C: or similar), got: " <<
148 qPrintable(data.at(0));
149 }
150 Q_ASSERT(data.at(0).endsWith(QLatin1Char(':'))); // assume something along "C:"
151 res += data.at(0);
152 start++;
153 }
154 #endif
155
156 for (int i = start; i < size; ++i) {
157 if (i || isLocalFile) {
158 res += QLatin1Char('/');
159 }
160
161 res += data.at(i);
162 }
163
164 return res;
165 }
166
pathOrUrl() const167 QString Path::pathOrUrl() const
168 {
169 return generatePathOrUrl(false, isLocalFile(), m_data);
170 }
171
path() const172 QString Path::path() const
173 {
174 return generatePathOrUrl(true, isLocalFile(), m_data);
175 }
176
toLocalFile() const177 QString Path::toLocalFile() const
178 {
179 return isLocalFile() ? path() : QString();
180 }
181
relativePath(const Path & path) const182 QString Path::relativePath(const Path& path) const
183 {
184 if (!path.isValid()) {
185 return QString();
186 }
187 if (!isValid() || remotePrefix() != path.remotePrefix()) {
188 // different remote destinations or we are invalid, return input as-is
189 return path.pathOrUrl();
190 }
191 // while I'd love to use QUrl::relativePath here, it seems to behave pretty
192 // strangely, and adds unexpected "./" at the start for example
193 // so instead, do it on our own based on _relativePath in kurl.cpp
194 // this should also be more performant I think
195
196 // Find where they meet
197 int level = isRemote() ? 1 : 0;
198 const int maxLevel = qMin(m_data.count(), path.m_data.count());
199 while (level < maxLevel && m_data.at(level) == path.m_data.at(level)) {
200 ++level;
201 }
202
203 // Need to go down out of our path to the common branch.
204 // but keep in mind that e.g. '/' paths have an empty name
205 int backwardSegments = m_data.count() - level;
206 if (backwardSegments && level < maxLevel && m_data.at(level).isEmpty()) {
207 --backwardSegments;
208 }
209
210 // Now up from the common branch to the second path.
211 int forwardSegmentsLength = 0;
212 for (int i = level; i < path.m_data.count(); ++i) {
213 forwardSegmentsLength += path.m_data.at(i).length();
214 // slashes
215 if (i + 1 != path.m_data.count()) {
216 forwardSegmentsLength += 1;
217 }
218 }
219
220 QString relativePath;
221 relativePath.reserve((backwardSegments * 3) + forwardSegmentsLength);
222 for (int i = 0; i < backwardSegments; ++i) {
223 relativePath.append(QLatin1String("../"));
224 }
225
226 for (int i = level; i < path.m_data.count(); ++i) {
227 relativePath.append(path.m_data.at(i));
228 if (i + 1 != path.m_data.count()) {
229 relativePath.append(QLatin1Char('/'));
230 }
231 }
232
233 Q_ASSERT(relativePath.length() == ((backwardSegments * 3) + forwardSegmentsLength));
234
235 return relativePath;
236 }
237
isParentPath(const QVector<QString> & parent,const QVector<QString> & child,bool direct)238 static bool isParentPath(const QVector<QString>& parent, const QVector<QString>& child, bool direct)
239 {
240 if (direct && child.size() != parent.size() + 1) {
241 return false;
242 } else if (!direct && child.size() <= parent.size()) {
243 return false;
244 }
245 for (int i = 0; i < parent.size(); ++i) {
246 if (child.at(i) != parent.at(i)) {
247 // support for trailing '/'
248 if (i + 1 == parent.size() && parent.at(i).isEmpty()) {
249 return true;
250 }
251 // otherwise we take a different branch here
252 return false;
253 }
254 }
255
256 return true;
257 }
258
isParentOf(const Path & path) const259 bool Path::isParentOf(const Path& path) const
260 {
261 if (!isValid() || !path.isValid() || remotePrefix() != path.remotePrefix()) {
262 return false;
263 }
264 return isParentPath(m_data, path.m_data, false);
265 }
266
isDirectParentOf(const Path & path) const267 bool Path::isDirectParentOf(const Path& path) const
268 {
269 if (!isValid() || !path.isValid() || remotePrefix() != path.remotePrefix()) {
270 return false;
271 }
272 return isParentPath(m_data, path.m_data, true);
273 }
274
remotePrefix() const275 QString Path::remotePrefix() const
276 {
277 return isRemote() ? m_data.first() : QString();
278 }
279
compare(const Path & other,Qt::CaseSensitivity cs) const280 int Path::compare(const Path& other, Qt::CaseSensitivity cs) const
281 {
282 const int size = m_data.size();
283 const int otherSize = other.m_data.size();
284 const int toCompare = std::min(size, otherSize);
285
286 // compare each Path segment in turn and try to return early
287 for (int i = 0; i < toCompare; ++i) {
288 const int comparison = m_data.at(i).compare(other.m_data.at(i), cs);
289 if (comparison != 0) {
290 return comparison;
291 }
292 }
293
294 // when we reach this point, all elements that we compared where equal
295 // thus return the segment count difference between the two paths
296 return size - otherSize;
297 }
298
toUrl() const299 QUrl Path::toUrl() const
300 {
301 return QUrl::fromUserInput(pathOrUrl());
302 }
303
isLocalFile() const304 bool Path::isLocalFile() const
305 {
306 // if the first data element contains a '/' it is a Path prefix
307 return !m_data.isEmpty() && !m_data.first().contains(QLatin1Char('/'));
308 }
309
isRemote() const310 bool Path::isRemote() const
311 {
312 return !m_data.isEmpty() && m_data.first().contains(QLatin1Char('/'));
313 }
314
lastPathSegment() const315 QString Path::lastPathSegment() const
316 {
317 // remote Paths are offset by one, thus never return the first item of them as file name
318 if (m_data.isEmpty() || (!isLocalFile() && m_data.size() == 1)) {
319 return QString();
320 }
321 return m_data.last();
322 }
323
setLastPathSegment(const QString & name)324 void Path::setLastPathSegment(const QString& name)
325 {
326 // remote Paths are offset by one, thus never return the first item of them as file name
327 if (m_data.isEmpty() || (!isLocalFile() && m_data.size() == 1)) {
328 // append the name to empty Paths or remote Paths only containing the Path prefix
329 m_data.append(name);
330 } else {
331 // overwrite the last data member
332 m_data.last() = name;
333 }
334 }
335
cleanPath(QVector<QString> * data,const bool isRemote)336 static void cleanPath(QVector<QString>* data, const bool isRemote)
337 {
338 if (data->isEmpty()) {
339 return;
340 }
341 const int startOffset = isRemote ? 1 : 0;
342 const auto start = data->begin() + startOffset;
343
344 auto it = start;
345 while (it != data->end()) {
346 if (*it == QLatin1String("..")) {
347 if (it == start) {
348 it = data->erase(it);
349 } else {
350 if (isWindowsDriveLetter(*(it - 1))) {
351 it = data->erase(it); // keep the drive letter
352 } else {
353 it = data->erase(it - 1, it + 1);
354 }
355 }
356 } else if (*it == QLatin1String(".")) {
357 it = data->erase(it);
358 } else {
359 ++it;
360 }
361 }
362 if (data->count() == startOffset) {
363 data->append(QString());
364 }
365 }
366
367 // Optimized QString::split code for the specific Path use-case
splitPath(const QString & source)368 static QVarLengthArray<QString, 16> splitPath(const QString& source)
369 {
370 QVarLengthArray<QString, 16> list;
371 int start = 0;
372 int end = 0;
373 while ((end = source.indexOf(QLatin1Char('/'), start)) != -1) {
374 if (start != end) {
375 list.append(source.mid(start, end - start));
376 }
377 start = end + 1;
378 }
379 if (start != source.size()) {
380 list.append(source.mid(start, -1));
381 }
382 return list;
383 }
384
addPath(const QString & path)385 void Path::addPath(const QString& path)
386 {
387 if (path.isEmpty()) {
388 return;
389 }
390
391 const auto& newData = splitPath(path);
392 if (newData.isEmpty()) {
393 if (m_data.size() == (isRemote() ? 1 : 0)) {
394 // this represents the root path, we just turned an invalid path into it
395 m_data << QString();
396 }
397 return;
398 }
399
400 auto it = newData.begin();
401 if (!m_data.isEmpty() && m_data.last().isEmpty()) {
402 // the root item is empty, set its contents and continue appending
403 m_data.last() = *it;
404 ++it;
405 }
406
407 std::copy(it, newData.end(), std::back_inserter(m_data));
408 cleanPath(&m_data, isRemote());
409 }
410
parent() const411 Path Path::parent() const
412 {
413 if (m_data.isEmpty()) {
414 return Path();
415 }
416
417 Path ret(*this);
418 if (m_data.size() == (1 + (isRemote() ? 1 : 0))) {
419 // keep the root item, but clear it, otherwise we'd make the path invalid
420 // or a URL a local path
421 auto& root = ret.m_data.last();
422 if (!isWindowsDriveLetter(root)) {
423 root.clear();
424 }
425 } else {
426 ret.m_data.pop_back();
427 }
428 return ret;
429 }
430
hasParent() const431 bool Path::hasParent() const
432 {
433 const int rootIdx = isRemote() ? 1 : 0;
434 return m_data.size() > rootIdx && !m_data[rootIdx].isEmpty();
435 }
436
cd(const QString & dir) const437 Path Path::cd(const QString& dir) const
438 {
439 if (!isValid()) {
440 return Path();
441 }
442 return Path(*this, dir);
443 }
444
445 namespace KDevelop {
qHash(const Path & path)446 uint qHash(const Path& path)
447 {
448 KDevHash hash;
449 for (const QString& segment : path.segments()) {
450 hash << qHash(segment);
451 }
452
453 return hash;
454 }
455
456 template<typename Container>
toPathList_impl(const Container & list)457 static Path::List toPathList_impl(const Container& list)
458 {
459 Path::List ret;
460 ret.reserve(list.size());
461 for (const auto& entry : list) {
462 Path path(entry);
463 if (path.isValid()) {
464 ret << path;
465 }
466 }
467
468 ret.squeeze();
469 return ret;
470 }
471
toPathList(const QList<QUrl> & list)472 Path::List toPathList(const QList<QUrl>& list)
473 {
474 return toPathList_impl(list);
475 }
476
toPathList(const QList<QString> & list)477 Path::List toPathList(const QList<QString>& list)
478 {
479 return toPathList_impl(list);
480 }
481
482 }
483
operator <<(QDebug s,const Path & string)484 QDebug operator<<(QDebug s, const Path& string)
485 {
486 s.nospace() << string.pathOrUrl();
487 return s.space();
488 }
489
490 namespace QTest {
491 template<>
toString(const Path & path)492 char* toString(const Path& path)
493 {
494 return qstrdup(qPrintable(path.pathOrUrl()));
495 }
496 }
497