CppTools: Fix QStringRef and QSharedPointer related issues with Qt6

Task-number: QTCREATORBUG-24098
Change-Id: I97347ac3fb397fea8eee655e3cc4ee252c511885
Reviewed-by: hjk <hjk@qt.io>

src/libs/cplusplus/BackwardsScanner.cpp

@@ -113,10 +113,12 @@ QString BackwardsScanner::text(int index) const
     return _text.mid(firstToken.utf16charsBegin(), firstToken.utf16chars());
 }
 
-QStringRef BackwardsScanner::textRef(int index) const
+QStringView BackwardsScanner::textRef(int index) const
 {
     const Token &firstToken = _tokens.at(index + _offset);
-    return _text.midRef(firstToken.utf16charsBegin(), firstToken.utf16chars());
+    if (firstToken.utf16charsEnd() > _text.size())
+        return QStringView(_text).mid(firstToken.utf16charsBegin());
+    return QStringView(_text).mid(firstToken.utf16charsBegin(), firstToken.utf16chars());
 }
 
 int BackwardsScanner::size() const

src/libs/cplusplus/BackwardsScanner.h

@@ -27,6 +27,7 @@
 
 #include "SimpleLexer.h"
 
+#include <QStringView>
 #include <QTextBlock>
 
 QT_FORWARD_DECLARE_CLASS(QTextCursor)
@@ -52,7 +53,7 @@ public:
     QString mid(int index) const;
 
     QString text(int index) const;
-    QStringRef textRef(int index) const;
+    QStringView textRef(int index) const;
     // 1-based
     Token LA(int index) const;
 

src/libs/cplusplus/MatchingText.cpp

@@ -54,7 +54,7 @@ static bool shouldOverrideChar(QChar ch)
 
 static bool isCompleteStringLiteral(const BackwardsScanner &tk, int index)
 {
-    const QStringRef text = tk.textRef(index);
+    const QStringView text = tk.textRef(index);
 
     if (text.length() < 2)
         return false;

src/libs/cplusplus/SimpleLexer.cpp

@@ -87,7 +87,9 @@ Tokens SimpleLexer::operator()(const QString &text, int state)
             break;
         }
 
-        QStringRef spell = text.midRef(tk.bytesBegin(), tk.bytes());
+        const QStringView spell = tk.bytesBegin() + tk.bytes() > text.size()
+                                      ? QStringView(text).mid(tk.bytesBegin())
+                                      : QStringView(text).mid(tk.bytesBegin(), tk.bytes());
         lex.setScanAngleStringLiteralTokens(false);
 
         if (tk.newline() && tk.is(T_POUND))

src/plugins/cpptools/cppcodeformatter.cpp

@@ -528,7 +528,7 @@ void CodeFormatter::recalculateStateAfter(const QTextBlock &block)
                 }
             }
 
-            QStringRef tokenText = currentTokenText();
+            QStringView tokenText = currentTokenText();
             if (tokenText == QLatin1String("ifdef")
                     || tokenText == QLatin1String("if")
                     || tokenText == QLatin1String("ifndef")) {
@@ -854,7 +854,7 @@ bool CodeFormatter::tryDeclaration()
         return true;
     case T_IDENTIFIER:
         if (m_tokenIndex == 0) {
-            const QStringRef tokenText = currentTokenText();
+            const QStringView tokenText = currentTokenText();
             if (tokenText.startsWith(QLatin1String("Q_"))
                     || tokenText.startsWith(QLatin1String("QT_"))
                     || tokenText.startsWith(QLatin1String("QML_"))
@@ -1009,9 +1009,11 @@ int CodeFormatter::column(int index) const
     return col;
 }
 
-QStringRef CodeFormatter::currentTokenText() const
+QStringView CodeFormatter::currentTokenText() const
 {
-    return m_currentLine.midRef(m_currentToken.utf16charsBegin(), m_currentToken.utf16chars());
+    if (m_currentToken.utf16charsEnd() > m_currentLine.size())
+        return QStringView(m_currentLine).mid(m_currentToken.utf16charsBegin());
+    return QStringView(m_currentLine).mid(m_currentToken.utf16charsBegin(), m_currentToken.utf16chars());
 }
 
 void CodeFormatter::turnInto(int newState)

src/plugins/cpptools/cppcodeformatter.h

@@ -216,7 +216,7 @@ private:
     void saveCurrentState(const QTextBlock &block);
     void restoreCurrentState(const QTextBlock &block);
 
-    QStringRef currentTokenText() const;
+    QStringView currentTokenText() const;
 
     int tokenizeBlock(const QTextBlock &block, bool *endedJoined = nullptr);
 

src/plugins/cpptools/cppcompletionassist.cpp

@@ -880,9 +880,12 @@ bool InternalCppCompletionAssistProcessor::accepts() const
                                && tokens.at(1).kind() == T_IDENTIFIER) {
                         const QString &line = tc.block().text();
                         const Token &idToken = tokens.at(1);
-                        const QStringRef &identifier =
+                        const QStringView &identifier = idToken.utf16charsEnd() > line.size()
-                                line.midRef(idToken.utf16charsBegin(),
+                                                            ? QStringView(line).mid(
-                                            idToken.utf16charsEnd() - idToken.utf16charsBegin());
+                                                                idToken.utf16charsBegin())
+                                                            : QStringView(line)
+                                                                  .mid(idToken.utf16charsBegin(),
+                                                                       idToken.utf16chars());
                         if (identifier == QLatin1String("include")
                                 || identifier == QLatin1String("include_next")
                                 || (m_interface->languageFeatures().objCEnabled && identifier == QLatin1String("import"))) {

src/plugins/cpptools/cpplocatorfilter.cpp

@@ -101,7 +101,7 @@ QList<Core::LocatorFilterEntry> CppLocatorFilter::matchesFor(
 
                 // Highlight the matched characters, therefore it may be necessary
                 // to update the match if the displayName is different from matchString
-                if (matchString.midRef(matchOffset) != filterEntry.displayName) {
+                if (QStringView(matchString).mid(matchOffset) != filterEntry.displayName) {
                     match = shortRegexp.match(filterEntry.displayName);
                     matchOffset = 0;
                 }

src/plugins/cpptools/cppoverviewmodel.cpp

@@ -132,7 +132,7 @@ QVariant SymbolItem::data(int /*column*/, int role) const
 
 bool OverviewModel::hasDocument() const
 {
-    return _cppDocument;
+    return !_cppDocument.isNull();
 }
 
 int OverviewModel::globalSymbolCount() const

src/plugins/cpptools/cpptoolsbridgeqtcreatorimplementation.cpp

@@ -55,7 +55,7 @@ CppTools::ProjectPart::Ptr projectPartForFile(const QString &filePath)
 bool isProjectPartValid(const CppTools::ProjectPart::Ptr projectPart)
 {
     if (projectPart)
-        return CppTools::CppModelManager::instance()->projectPartForId(projectPart->id());
+        return !CppTools::CppModelManager::instance()->projectPartForId(projectPart->id()).isNull();
 
     return false;
 }