Utils: Add FilePath::pathComponents()

Change-Id: I8741ea395435d90b30c2d07a1c33355213300ad7
Reviewed-by: hjk <hjk@qt.io>

src/libs/utils/filepath.cpp

@@ -531,6 +531,37 @@ QString FilePath::completeSuffix() const
     return {};
 }
 
+QList<QStringView> FilePath::pathComponents() const
+{
+    QList<QStringView> result;
+    QStringView path = pathView();
+    int start = 0;
+
+    if (osType() == OsTypeWindows && startsWithDriveLetter()) {
+        start = 2;
+        result.append(path.mid(0, 2));
+        if (path.size() == 2)
+            return result;
+        else if (path.at(2) == '/') {
+            result.append(path.mid(2, 1));
+            start = 3;
+        }
+    }
+
+    while (start < path.size()) {
+        int end = path.indexOf('/', start);
+        if (end == -1)
+            end = path.size();
+        // Consider "/" as a path component
+        if (end == 0)
+            result.append(path.mid(start, 1));
+        else
+            result.append(path.mid(start, end - start));
+        start = end + 1;
+    }
+    return result;
+}
+
 QStringView FilePath::scheme() const
 {
     return QStringView{m_data}.mid(m_pathLen, m_schemeLen);

src/libs/utils/filepath.h

@@ -138,6 +138,8 @@ public:
     QStringView suffixView() const;
     QString completeSuffix() const;
 
+    [[nodiscard]] QList<QStringView> pathComponents() const;
+
     [[nodiscard]] FilePath pathAppended(const QString &str) const;
     [[nodiscard]] FilePath stringAppended(const QString &str) const;
     [[nodiscard]] std::optional<FilePath> tailRemoved(const QString &str) const;

tests/auto/utils/filepath/tst_filepath.cpp

@@ -129,6 +129,9 @@ private slots:
     void isRelativePath();
     void isRelativePath_data();
 
+    void pathComponents();
+    void pathComponents_data();
+
 private:
     QTemporaryDir tempDir;
     QString rootPath;
@@ -1883,6 +1886,56 @@ void tst_filepath::dontBreakPathOnWierdWindowsPaths()
     QCOMPARE(path4.toUrlishString(), "device://host/./foo/bar");
 }
 
+void tst_filepath::pathComponents_data()
+{
+    QTest::addColumn<QString>("path");
+    QTest::addColumn<QStringList>("expected");
+
+    QTest::newRow("empty") << "" << QStringList{};
+    QTest::newRow("root") << "/" << QStringList{"/"};
+    QTest::newRow("relative") << "foo" << QStringList{"foo"};
+    QTest::newRow("relative-path") << "foo/bar" << QStringList{"foo", "bar"};
+    QTest::newRow("absolute") << "/foo" << QStringList{"/", "foo"};
+    QTest::newRow("absolute-path") << "/foo/bar" << QStringList{"/", "foo", "bar"};
+    QTest::newRow("remote") << "device://host/foo" << QStringList{"/", "foo"};
+    QTest::newRow("remote-path") << "device://host/foo/bar" << QStringList{"/", "foo", "bar"};
+    QTest::newRow("remote-relative") << "device://host/./foo" << QStringList{"foo"};
+    QTest::newRow("windows-current-dir") << "c:" << QStringList{"c:"};
+
+    QTest::newRow("single-letter") << "c" << QStringList{"c"};
+    QTest::newRow("single-letter-path") << "c/b" << QStringList{"c", "b"};
+    QTest::newRow("single-letter-path-with-root") << "/c/b" << QStringList{"/", "c", "b"};
+
+    if (HostOsInfo::isWindowsHost()) {
+        QTest::newRow("cwd-windows-path") << "c:foo" << QStringList{"c:", "foo"};
+        QTest::newRow("windows-path") << "c:/" << QStringList{"c:", "/"};
+        QTest::newRow("windows-path-2") << "c:/test" << QStringList{"c:", "/", "test"};
+        QTest::newRow("single-letter-path-with-windows-root")
+            << "c:/a/b/c" << QStringList{"c:", "/", "a", "b", "c"};
+        QTest::newRow("windows-path-with-dir") << "c:/foo" << QStringList{"c:", "/", "foo"};
+    } else {
+        QTest::newRow("cwd-windows-path") << "c:foo" << QStringList{"c:foo"};
+        QTest::newRow("windows-path") << "c:/" << QStringList{"c:"};
+        QTest::newRow("windows-path-2") << "c:/test" << QStringList{"c:", "test"};
+        QTest::newRow("single-letter-path-with-windows-root")
+            << "c:/a/b/c" << QStringList{"c:", "a", "b", "c"};
+        QTest::newRow("windows-path-with-dir") << "c:/foo" << QStringList{"c:", "foo"};
+    }
+}
+
+void tst_filepath::pathComponents()
+{
+    QFETCH(QString, path);
+    QFETCH(QStringList, expected);
+
+    const auto components
+        = Utils::transform<QStringList>(FilePath::fromString(path).pathComponents(), [](auto view) {
+              return QString(view);
+          });
+
+    QCOMPARE(components, expected);
+}
+
 } // Utils
 
 QTEST_GUILESS_MAIN(Utils::tst_filepath)