Optimize QString::split usage

To increase efficiency QString::split is performed only to strings
which are not empty.

Task-number: QTIFW-2805
Change-Id: Ieed887a3e6f415395497dcdf05c118b32c72d9ee
Reviewed-by: Arttu Tarkiainen <arttu.tarkiainen@qt.io>

4 files changed, 22 insertions, 13 deletions

diff --git a/src/libs/installer/component.cpp b/src/libs/installer/component.cpp
index 32f3fefc6..f5958cc65 100644
--- a/src/libs/installer/component.cpp
+++ b/src/libs/installer/component.cpp
@@ -367,13 +367,13 @@ void Component::loadDataFromPackage(const Package &package)
         return;
 
     setLocalTempPath(QInstaller::pathFromUrl(package.packageSource().url));
-    const QStringList uis = package.data(QLatin1String("UserInterfaces")).toString()
-        .split(QInstaller::commaRegExp(), Qt::SkipEmptyParts);
-    if (!uis.isEmpty())
-        loadUserInterfaces(QDir(QString::fromLatin1("%1/%2").arg(localTempPath(), name())), uis);
+
+    const QStringList uiList = QInstaller::splitStringWithComma(package.data(QLatin1String("UserInterfaces")).toString());
+    if (!uiList.isEmpty())
+        loadUserInterfaces(QDir(QString::fromLatin1("%1/%2").arg(localTempPath(), name())), uiList);
+
 #ifndef IFW_DISABLE_TRANSLATIONS
-    const QStringList qms = package.data(QLatin1String("Translations")).toString()
-        .split(QInstaller::commaRegExp(), Qt::SkipEmptyParts);
+    const QStringList qms = QInstaller::splitStringWithComma(package.data(QLatin1String("Translations")).toString());
     if (!qms.isEmpty())
         loadTranslations(QDir(QString::fromLatin1("%1/%2").arg(localTempPath(), name())), qms);
 #endif
@@ -1417,7 +1417,7 @@ void Component::addDependency(const QString &newDependency)
 */
 QStringList Component::dependencies() const
 {
-    return d->m_vars.value(scDependencies).split(QInstaller::commaRegExp(), Qt::SkipEmptyParts);
+    return QInstaller::splitStringWithComma(d->m_vars.value(scDependencies));
 }
 
 /*!
@@ -1425,7 +1425,7 @@ QStringList Component::dependencies() const
 */
 QStringList Component::localDependencies() const
 {
-    return d->m_vars.value(scLocalDependencies).split(QInstaller::commaRegExp(), Qt::SkipEmptyParts);
+    return QInstaller::splitStringWithComma(d->m_vars.value(scLocalDependencies));
 }
 
 /*!
diff --git a/src/libs/installer/globals.cpp b/src/libs/installer/globals.cpp
index bea299696..5240138c4 100644
--- a/src/libs/installer/globals.cpp
+++ b/src/libs/installer/globals.cpp
@@ -1,6 +1,6 @@
 /**************************************************************************
 **
-** Copyright (C) 2020 The Qt Company Ltd.
+** Copyright (C) 2023 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the Qt Installer Framework.
@@ -60,6 +60,12 @@ namespace QInstaller
     \internal
 */
 
+/*!
+    \fn inline QInstaller::splitStringWithComma(const QString &value())
+    Splits \a value into substrings wherever comma occurs, and returns the list of those strings.
+    \internal
+*/
+
 Q_LOGGING_CATEGORY(lcServer, IFW_SERVER)
 Q_LOGGING_CATEGORY(lcInstallerInstallLog, IFW_INSTALLER_INSTALLLOG)
 Q_LOGGING_CATEGORY(lcProgressIndicator, IFW_PROGRESS_INDICATOR)
diff --git a/src/libs/installer/globals.h b/src/libs/installer/globals.h
index 3450c0dad..3b3f4e3ab 100644
--- a/src/libs/installer/globals.h
+++ b/src/libs/installer/globals.h
@@ -1,6 +1,6 @@
 /**************************************************************************
 **
-** Copyright (C) 2022 The Qt Company Ltd.
+** Copyright (C) 2023 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the Qt Installer Framework.
@@ -44,6 +44,11 @@ INSTALLER_EXPORT Q_DECLARE_LOGGING_CATEGORY(lcDeveloperBuild)
 QStringList INSTALLER_EXPORT loggingCategories();
 
 QRegularExpression INSTALLER_EXPORT commaRegExp();
+inline QStringList splitStringWithComma(const QString &value) {
+    if (!value.isEmpty())
+        return value.split(QInstaller::commaRegExp(), Qt::SkipEmptyParts);
+    return QStringList();
+}
 
 QString htmlToString(const QString &html);
 QString enumToString(const QMetaObject& metaObject, const char *enumerator, int key);
diff --git a/src/libs/installer/packagemanagercore.cpp b/src/libs/installer/packagemanagercore.cpp
index 2f69c20c8..d5758438d 100644
--- a/src/libs/installer/packagemanagercore.cpp
+++ b/src/libs/installer/packagemanagercore.cpp
@@ -4021,9 +4021,7 @@ bool PackageManagerCore::updateComponentData(struct Data &data, Component *compo
         if (component->isFromOnlineRepository())
             component->addDownloadableArchives(data.package->data(scDownloadableArchives).toString());
 
-        const QStringList componentsToReplace = data.package->data(scReplaces).toString()
-            .split(QInstaller::commaRegExp(), Qt::SkipEmptyParts);
-
+        const QStringList componentsToReplace = QInstaller::splitStringWithComma(data.package->data(scReplaces).toString());
         if (!componentsToReplace.isEmpty()) {
             // Store the component (this is a component that replaces others) and all components that
             // this one will replace.