QmlProject: Move project file pattern searches from StudioWelcome plugin to QmlProject plugin

Task-number: QDS-6930
Change-Id: I63345b539efdafa754671aef46ad808999914edb
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/qmlprojectmanager/projectfilecontenttools.cpp

@@ -0,0 +1,129 @@
+/****************************************************************************
+**
+** Copyright (C) 2022 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#include "projectfilecontenttools.h"
+
+#include <projectexplorer/project.h>
+
+#include <QRegularExpression>
+#include <QRegularExpressionMatch>
+
+namespace QmlProjectManager {
+namespace ProjectFileContentTools {
+
+QRegularExpression qdsVerRegexp(R"x(qdsVersion: "(.*)")x");
+
+const Utils::FilePaths rootCmakeFiles(ProjectExplorer::Project *project)
+{
+    if (!project)
+        project = ProjectExplorer::SessionManager::startupProject();
+    if (!project)
+        return {};
+    return project->projectDirectory().dirEntries({QList<QString>("CMakeLists.txt"), QDir::Files});
+}
+
+const QString readFileContents(const Utils::FilePath &filePath)
+{
+    Utils::FileReader reader;
+    if (!reader.fetch(filePath))
+        return {};
+    return QString::fromUtf8(reader.data());
+}
+
+const QString qdsVersion(const Utils::FilePath &projectFilePath)
+{
+    const QString projectFileContent = readFileContents(projectFilePath);
+    QRegularExpressionMatch match = qdsVerRegexp.match(projectFileContent);
+    if (!match.hasMatch())
+        return {};
+    QString version = match.captured(1);
+    return version.isEmpty() ? QObject::tr("Unknown") : version;
+}
+
+QRegularExpression qt6Regexp("(qt6project:)\\s*\"*(true|false)\"*", QRegularExpression::CaseInsensitiveOption);
+
+const QString qtVersion(const Utils::FilePath &projectFilePath)
+{
+    const QString defaultReturn = QObject::tr("Unknown");
+    const QString data = readFileContents(projectFilePath);
+    QRegularExpressionMatch match = qt6Regexp.match(data);
+    if (!match.hasMatch())
+        return defaultReturn;
+    return match.captured(2).contains("true", Qt::CaseInsensitive)
+            ? QObject::tr("Qt6 or later")
+            : QObject::tr("Qt5 or earlier");
+}
+
+bool isQt6Project(const Utils::FilePath &projectFilePath)
+{
+    const QString data = readFileContents(projectFilePath);
+    QRegularExpressionMatch match = qt6Regexp.match(data);
+    if (!match.hasMatch())
+        return false;
+    return match.captured(2).contains("true", Qt::CaseInsensitive);
+}
+
+const QString getMainQmlFile(const Utils::FilePath &projectFilePath)
+{
+    const QString defaultReturn = "content/App.qml";
+    const QString data = readFileContents(projectFilePath);
+    QRegularExpression regexp(R"x(mainFile: "(.*)")x");
+    QRegularExpressionMatch match = regexp.match(data);
+    if (!match.hasMatch())
+        return defaultReturn;
+    return match.captured(1);
+}
+
+const QString appQmlFile(const Utils::FilePath &projectFilePath)
+{
+    return projectFilePath.toFileInfo().dir().absolutePath() + "/" +  getMainQmlFile(projectFilePath);
+}
+
+const Resolution resolutionFromConstants(const Utils::FilePath &projectFilePath)
+{
+    const QFileInfo fileInfo = projectFilePath.toFileInfo();
+    const QString fileName = fileInfo.dir().absolutePath()
+            + "/"  + "imports" + "/" + fileInfo.baseName() + "/Constants.qml";
+    Utils::FileReader reader;
+    if (!reader.fetch(Utils::FilePath::fromString(fileName)))
+        return {};
+    const QByteArray data = reader.data();
+    const QRegularExpression regexpWidth(R"x(readonly\s+property\s+int\s+width:\s+(\d*))x");
+    const QRegularExpression regexpHeight(R"x(readonly\s+property\s+int\s+height:\s+(\d*))x");
+    int width = -1;
+    int height = -1;
+    QRegularExpressionMatch match = regexpHeight.match(QString::fromUtf8(data));
+    if (match.hasMatch())
+        height = match.captured(1).toInt();
+    match = regexpWidth.match(QString::fromUtf8(data));
+    if (match.hasMatch())
+        width = match.captured(1).toInt();
+    if (width > 0 && height > 0)
+        return {width, height};
+    return {};
+}
+
+} //ProjectFileContentTools
+} //QmlProjectManager