fixed some "Declaration and assignment can be joined" Rider warnings (#5569)

gui/projectfile.cpp

@@ -388,10 +388,9 @@ QString ProjectFile::readString(QXmlStreamReader &reader)
 
 void ProjectFile::readIncludeDirs(QXmlStreamReader &reader)
 {
-    QXmlStreamReader::TokenType type;
     bool allRead = false;
     do {
-        type = reader.readNext();
+        QXmlStreamReader::TokenType type = reader.readNext();
         switch (type) {
         case QXmlStreamReader::StartElement:
 
@@ -426,10 +425,9 @@ void ProjectFile::readIncludeDirs(QXmlStreamReader &reader)
 
 void ProjectFile::readDefines(QXmlStreamReader &reader)
 {
-    QXmlStreamReader::TokenType type;
     bool allRead = false;
     do {
-        type = reader.readNext();
+        QXmlStreamReader::TokenType type = reader.readNext();
         switch (type) {
         case QXmlStreamReader::StartElement:
             // Read define-elements
@@ -463,10 +461,9 @@ void ProjectFile::readDefines(QXmlStreamReader &reader)
 
 void ProjectFile::readCheckPaths(QXmlStreamReader &reader)
 {
-    QXmlStreamReader::TokenType type;
     bool allRead = false;
     do {
-        type = reader.readNext();
+        QXmlStreamReader::TokenType type = reader.readNext();
         switch (type) {
         case QXmlStreamReader::StartElement:
 
@@ -501,10 +498,9 @@ void ProjectFile::readCheckPaths(QXmlStreamReader &reader)
 
 void ProjectFile::readExcludes(QXmlStreamReader &reader)
 {
-    QXmlStreamReader::TokenType type;
     bool allRead = false;
     do {
-        type = reader.readNext();
+        QXmlStreamReader::TokenType type = reader.readNext();
         switch (type) {
         case QXmlStreamReader::StartElement:
             // Read exclude-elements
@@ -547,9 +543,8 @@ void ProjectFile::readExcludes(QXmlStreamReader &reader)
 
 void ProjectFile::readVsConfigurations(QXmlStreamReader &reader)
 {
-    QXmlStreamReader::TokenType type;
     do {
-        type = reader.readNext();
+        QXmlStreamReader::TokenType type = reader.readNext();
         switch (type) {
         case QXmlStreamReader::StartElement:
             // Read library-elements
@@ -611,9 +606,8 @@ void ProjectFile::readPlatform(QXmlStreamReader &reader)
 
 void ProjectFile::readSuppressions(QXmlStreamReader &reader)
 {
-    QXmlStreamReader::TokenType type;
     do {
-        type = reader.readNext();
+        QXmlStreamReader::TokenType type = reader.readNext();
         switch (type) {
         case QXmlStreamReader::StartElement:
             // Read library-elements
@@ -658,9 +652,8 @@ void ProjectFile::readSuppressions(QXmlStreamReader &reader)
 
 void ProjectFile::readTagWarnings(QXmlStreamReader &reader, const QString &tag)
 {
-    QXmlStreamReader::TokenType type;
     do {
-        type = reader.readNext();
+        QXmlStreamReader::TokenType type = reader.readNext();
         switch (type) {
         case QXmlStreamReader::StartElement:
             // Read library-elements
@@ -693,10 +686,9 @@ void ProjectFile::readTagWarnings(QXmlStreamReader &reader, const QString &tag)
 
 void ProjectFile::readStringList(QStringList &stringlist, QXmlStreamReader &reader, const char elementname[])
 {
-    QXmlStreamReader::TokenType type;
     bool allRead = false;
     do {
-        type = reader.readNext();
+        QXmlStreamReader::TokenType type = reader.readNext();
         switch (type) {
         case QXmlStreamReader::StartElement:
             // Read library-elements

gui/resultstree.cpp

@@ -221,8 +221,7 @@ bool ResultsTree::addErrorItem(const ErrorItem &item)
             line.file = e.file;
             line.line = e.line;
             line.message = line.summary = e.info;
-            QStandardItem *child_item;
+            QStandardItem *child_item = addBacktraceFiles(stditem,
-            child_item = addBacktraceFiles(stditem,
                                                           line,
                                                           hide,
                                                           ":images/go-down.png",
@@ -1140,11 +1139,10 @@ QString ResultsTree::getFilePath(const QStandardItem *target, bool fullPath)
             target = target->parent()->child(target->row(), 0);
 
         QVariantMap data = target->data().toMap();
-        QString pathStr;
 
         //Replace (file) with filename
         QString file = data[FILENAME].toString();
-        pathStr = QDir::toNativeSeparators(file);
+        QString pathStr = QDir::toNativeSeparators(file);
         if (!fullPath) {
             QFileInfo fi(pathStr);
             pathStr = fi.fileName();

gui/statsdialog.cpp

@@ -113,8 +113,7 @@ void StatsDialog::setProject(const ProjectFile* projectFile)
         }
         mUI->mLblHistoryFile->setText(tr("File: ") + (statsFile.isEmpty() ? tr("No cppcheck build dir") : statsFile));
         if (!statsFile.isEmpty()) {
-            QChartView *chartView;
+            QChartView *chartView = createChart(statsFile, "cppcheck");
-            chartView = createChart(statsFile, "cppcheck");
             mUI->mTabHistory->layout()->addWidget(chartView);
             if (projectFile->getClangAnalyzer()) {
                 chartView = createChart(statsFile, CLANG_ANALYZER);

lib/checknullpointer.cpp

@@ -452,8 +452,7 @@ void CheckNullPointer::nullPointerError(const Token *tok, const std::string &var
     } else if (value->defaultArg) {
         reportError(errorPath, Severity::warning, "nullPointerDefaultArg", errmsgdefarg, CWE_NULL_POINTER_DEREFERENCE, inconclusive || value->isInconclusive() ? Certainty::inconclusive : Certainty::normal);
     } else {
-        std::string errmsg;
+        std::string errmsg = std::string(value->isKnown() ? "Null" : "Possible null") + " pointer dereference";
-        errmsg = std::string(value->isKnown() ? "Null" : "Possible null") + " pointer dereference";
         if (!varname.empty())
             errmsg = "$symbol:" + varname + '\n' + errmsg + ": $symbol";
 

lib/checkstl.cpp

@@ -2492,8 +2492,7 @@ void CheckStl::dereferenceInvalidIteratorError(const Token* tok, const ValueFlow
     if (value->condition) {
         reportError(errorPath, Severity::warning, "derefInvalidIteratorRedundantCheck", errmsgcond, CWE825, (inconclusive || value->isInconclusive()) ? Certainty::inconclusive : Certainty::normal);
     } else {
-        std::string errmsg;
+        std::string errmsg = std::string(value->isKnown() ? "Dereference" : "Possible dereference") + " of an invalid iterator";
-        errmsg = std::string(value->isKnown() ? "Dereference" : "Possible dereference") + " of an invalid iterator";
         if (!varname.empty())
             errmsg = "$symbol:" + varname + '\n' + errmsg + ": $symbol";
 

lib/checkunusedvar.cpp

@@ -231,9 +231,7 @@ void Variables::clearAliases(nonneg int varid)
 
     if (usage) {
         // remove usage from all aliases
-        std::set<nonneg int>::const_iterator i;
+        for (std::set<nonneg int>::const_iterator i = usage->_aliases.cbegin(); i != usage->_aliases.cend(); ++i) {
-
-        for (i = usage->_aliases.cbegin(); i != usage->_aliases.cend(); ++i) {
             VariableUsage *temp = find(*i);
 
             if (temp)

lib/symboldatabase.cpp

@@ -3214,10 +3214,8 @@ void SymbolDatabase::addClassFunction(Scope **scope, const Token **tok, const To
         path.insert(0, ":: ");
     }
 
-    std::list<Scope>::iterator it1;
-
     // search for match
-    for (it1 = scopeList.begin(); it1 != scopeList.end(); ++it1) {
+    for (std::list<Scope>::iterator it1 = scopeList.begin(); it1 != scopeList.end(); ++it1) {
         Scope *scope1 = &(*it1);
 
         bool match = false;

lib/token.cpp

@@ -1889,8 +1889,7 @@ const ValueFlow::Value * Token::getInvalidValue(const Token *ftok, nonneg int ar
     if (!mImpl->mValues || !settings)
         return nullptr;
     const ValueFlow::Value *ret = nullptr;
-    std::list<ValueFlow::Value>::const_iterator it;
+    for (std::list<ValueFlow::Value>::const_iterator it = mImpl->mValues->begin(); it != mImpl->mValues->end(); ++it) {
-    for (it = mImpl->mValues->begin(); it != mImpl->mValues->end(); ++it) {
         if (it->isImpossible())
             continue;
         if ((it->isIntValue() && !settings->library.isIntArgValid(ftok, argnr, it->intvalue)) ||
@@ -1916,8 +1915,7 @@ const Token *Token::getValueTokenMinStrSize(const Settings *settings, MathLib::b
         return nullptr;
     const Token *ret = nullptr;
     int minsize = INT_MAX;
-    std::list<ValueFlow::Value>::const_iterator it;
+    for (std::list<ValueFlow::Value>::const_iterator it = mImpl->mValues->begin(); it != mImpl->mValues->end(); ++it) {
-    for (it = mImpl->mValues->begin(); it != mImpl->mValues->end(); ++it) {
         if (it->isTokValue() && it->tokvalue && it->tokvalue->tokType() == Token::eString) {
             const int size = getStrSize(it->tokvalue, settings);
             if (!ret || size < minsize) {
@@ -1937,8 +1935,7 @@ const Token *Token::getValueTokenMaxStrLength() const
         return nullptr;
     const Token *ret = nullptr;
     int maxlength = 0;
-    std::list<ValueFlow::Value>::const_iterator it;
+    for (std::list<ValueFlow::Value>::const_iterator it = mImpl->mValues->begin(); it != mImpl->mValues->end(); ++it) {
-    for (it = mImpl->mValues->begin(); it != mImpl->mValues->end(); ++it) {
         if (it->isTokValue() && it->tokvalue && it->tokvalue->tokType() == Token::eString) {
             const int length = getStrLength(it->tokvalue);
             if (!ret || length > maxlength) {