QString AbstractEditorSupport::functionAt(const CppModelManagerInterface *modelManager,
                                          const QString &fileName,
                                          int line, int column)
{
    const CPlusPlus::Snapshot snapshot = modelManager->snapshot();
    const CPlusPlus::Document::Ptr document = snapshot.document(fileName);
    if (!document)
        return QString();
    if (const CPlusPlus::Symbol *symbol = document->lastVisibleSymbolAt(line, column))
        if (const CPlusPlus::Scope *scope = symbol->enclosingScope())
            if (const CPlusPlus::Scope *functionScope = scope->enclosingFunction())
                if (const CPlusPlus::Symbol *function = functionScope) {
                    const CPlusPlus::Overview o;
                    QString rc = o.prettyName(function->name());
                    // Prepend namespace "Foo::Foo::foo()" up to empty root namespace
                    for (const CPlusPlus::Symbol *owner = function->enclosingNamespace();
                         owner; owner = owner->enclosingNamespace()) {
                        const QString name = o.prettyName(owner->name());
                        if (name.isEmpty()) {
                            break;
                        } else {
                            rc.prepend(QLatin1String("::"));
                            rc.prepend(name);
                        }
                    }
                    return rc;
                }
    return QString();
}

static ClassDocumentPtrPair
        findClassRecursively(const CPlusPlus::Snapshot &docTable,
                             const Document::Ptr &doc, const QString &className,
                             unsigned maxIncludeDepth, QString *namespaceName)
{
    if (Designer::Constants::Internal::debug)
        qDebug() << Q_FUNC_INFO << doc->fileName() << className << maxIncludeDepth;
    // Check document
    if (const Class *cl = findClass(doc->globalNamespace(), className, namespaceName))
        return ClassDocumentPtrPair(cl, doc);
    if (maxIncludeDepth) {
        // Check the includes
        const unsigned recursionMaxIncludeDepth = maxIncludeDepth - 1u;
        foreach (const QString &include, doc->includedFiles()) {
            const CPlusPlus::Snapshot::const_iterator it = docTable.find(include);
            if (it != docTable.end()) {
                const Document::Ptr includeDoc = it.value();
                const ClassDocumentPtrPair irc = findClassRecursively(docTable, it.value(), className, recursionMaxIncludeDepth, namespaceName);
                if (irc.first)
                    return irc;
            }
        }
    }
    return ClassDocumentPtrPair(0, Document::Ptr());
}

static bool includesQtTest(const CPlusPlus::Document::Ptr &doc,
                           const CppTools::CppModelManager *cppMM)
{
    static QString expectedHeaderPrefix
            = Utils::HostOsInfo::isMacHost()
            ? QLatin1String("QtTest.framework/Headers")
            : QLatin1String("QtTest");

    const QList<CPlusPlus::Document::Include> includes = doc->resolvedIncludes();

    foreach (const CPlusPlus::Document::Include &inc, includes) {
        // TODO this short cut works only for #include <QtTest>
        // bad, as there could be much more different approaches
        if (inc.unresolvedFileName() == QLatin1String("QtTest")
                && inc.resolvedFileName().endsWith(
                    QString::fromLatin1("%1/QtTest").arg(expectedHeaderPrefix))) {
            return true;
        }
    }

    if (cppMM) {
        CPlusPlus::Snapshot snapshot = cppMM->snapshot();
        const QSet<QString> allIncludes = snapshot.allIncludesForDocument(doc->fileName());
        foreach (const QString &include, allIncludes) {

            if (include.endsWith(QString::fromLatin1("%1/qtest.h").arg(expectedHeaderPrefix))) {
                return true;
            }
        }
    }
    return false;
}

CPlusPlus::Function *CppFunction::function(int line, int column, const QString &fileName)
{
    const CPlusPlus::Snapshot snapshot = CppTools::CppModelManagerInterface::instance()->snapshot();
    const CPlusPlus::Document::Ptr document = snapshot.document(fileName);
    if (!document)
        return 0;

    CPlusPlus::Symbol *symbol = document->lastVisibleSymbolAt(line, column);
    if (!symbol)
        return 0;

    // Find the enclosing function scope (which might be several levels up, or we might be standing on it)
    CPlusPlus::Scope *scope;
    if (symbol->isScope())
        scope = symbol->asScope();
    else
        scope = symbol->enclosingScope();

    while (scope && !scope->isFunction() )
        scope = scope->enclosingScope();

    if (!scope)
        return 0;

    return scope->asFunction();
}

QList<CPlusPlus::Document::Ptr> Utils::snapshotToList(const CPlusPlus::Snapshot &snapshot)
{
    QList<CPlusPlus::Document::Ptr> documents;
    CPlusPlus::Snapshot::const_iterator it = snapshot.begin(), end = snapshot.end();
    for (; it != end; ++it)
        documents.append(it.value());
    return documents;
}

// Inline helper with integer error return codes.
static inline
int getUninitializedVariablesI(const CPlusPlus::Snapshot &snapshot,
                               const QString &functionName,
                               const QString &file,
                               int line,
                               QStringList *uninitializedVariables)
{
    uninitializedVariables->clear();
    // Find document
    if (snapshot.isEmpty() || functionName.isEmpty() || file.isEmpty() || line < 1)
        return 1;
    const CPlusPlus::Snapshot::const_iterator docIt = snapshot.find(file);
    if (docIt == snapshot.end())
        return 2;
    const CPlusPlus::Document::Ptr doc = docIt.value();
    // Look at symbol at line and find its function. Either it is the
    // function itself or some expression/variable.
    const CPlusPlus::Symbol *symbolAtLine = doc->lastVisibleSymbolAt(line, 0);
    if (!symbolAtLine)
        return 4;
    // First figure out the function to do a safety name check
    // and the innermost scope at cursor position
    const CPlusPlus::Function *function = 0;
    const CPlusPlus::Scope *innerMostScope = 0;
    if (symbolAtLine->isFunction()) {
        function = symbolAtLine->asFunction();
        if (function->memberCount() == 1) // Skip over function block
            if (CPlusPlus::Block *block = function->memberAt(0)->asBlock())
                innerMostScope = block;
    } else {
        if (const CPlusPlus::Scope *functionScope = symbolAtLine->enclosingFunction()) {
            function = functionScope->asFunction();
            innerMostScope = symbolAtLine->isBlock() ?
                             symbolAtLine->asBlock() :
                             symbolAtLine->enclosingBlock();
        }
    }
    if (!function || !innerMostScope)
        return 7;
    // Compare function names with a bit off fuzz,
    // skipping modules from a CDB symbol "lib!foo" or namespaces
    // that the code model does not show at this point
    CPlusPlus::Overview overview;
    const QString name = overview.prettyName(function->name());
    if (!functionName.endsWith(name))
        return 11;
    if (functionName.size() > name.size()) {
        const char previousChar = functionName.at(functionName.size() - name.size() - 1).toLatin1();
        if (previousChar != ':' && previousChar != '!' )
            return 11;
    }
    // Starting from the innermost block scope, collect declarations.
    SeenHash seenHash;
    blockRecursion(overview, innerMostScope, line, uninitializedVariables, &seenHash);
    return 0;
}

static bool includesGTest(const CPlusPlus::Document::Ptr &doc,
                          const CppTools::CppModelManager *cppMM)
{
    const QString gtestH = QLatin1String("gtest/gtest.h");
    foreach (const CPlusPlus::Document::Include &inc, doc->resolvedIncludes()) {
        if (inc.resolvedFileName().endsWith(gtestH))
            return true;
    }

    if (cppMM) {
        const CPlusPlus::Snapshot snapshot = cppMM->snapshot();
        foreach (const QString &include, snapshot.allIncludesForDocument(doc->fileName())) {
            if (include.endsWith(gtestH))
                return true;
        }
    }

    return false;
}

static bool snapshotContains(const CPlusPlus::Snapshot &snapshot, const QSet<QString> &filePaths)
{
    foreach (const QString &filePath, filePaths) {
        if (!snapshot.contains(filePath)) {
            const QString warning = QLatin1String("Missing file in snapshot: ") + filePath;
            QWARN(qPrintable(warning));
            return false;
        }
    }
    return true;
}

bool getUninitializedVariables(const CPlusPlus::Snapshot &snapshot,
                               const QString &function,
                               const QString &file,
                               int line,
                               QStringList *uninitializedVariables)
{
    const int rc = getUninitializedVariablesI(snapshot, function, file, line, uninitializedVariables);
    if (debug) {
        QString msg;
        QTextStream str(&msg);
        str << "getUninitializedVariables() " << function << ' ' << file << ':' << line
                << " returns (int) " << rc << " '"
                << uninitializedVariables->join(QString(QLatin1Char(','))) << '\'';
        if (rc)
            str << " of " << snapshot.size() << " documents";
        qDebug() << msg;
    }
    return rc == 0;
}

bool QtCreatorIntegration::navigateToSlot(const QString &objectName,
                                          const QString &signalSignature,
                                          const QStringList &parameterNames,
                                          QString *errorMessage)
{
    const EditorData ed = m_few->activeEditor();
    QTC_ASSERT(ed, return false)
    const QString currentUiFile = ed.formWindowEditor->file()->fileName();
#if 0
    return Designer::Internal::navigateToSlot(currentUiFile, objectName, signalSignature, parameterNames, errorMessage);
#endif
    // TODO: we should pass to findDocumentsIncluding an absolute path to generated .h file from ui.
    // Currently we are guessing the name of ui_<>.h file and pass the file name only to the findDocumentsIncluding().
    // The idea is that the .pro file knows if the .ui files is inside, and the .pro file knows it will
    // be generating the ui_<>.h file for it, and the .pro file knows what the generated file's name and its absolute path will be.
    // So we should somehow get that info from project manager (?)
    const QFileInfo fi(currentUiFile);
    const QString uicedName = QLatin1String("ui_") + fi.completeBaseName() + QLatin1String(".h");

    // Retrieve code model snapshot restricted to project of ui file.
    const ProjectExplorer::Project *uiProject = ProjectExplorer::ProjectExplorerPlugin::instance()->session()->projectForFile(currentUiFile);
    if (!uiProject) {
        *errorMessage = tr("Internal error: No project could be found for %1.").arg(currentUiFile);
        return false;
    }
    CPlusPlus::Snapshot docTable = CppModelManagerInterface::instance()->snapshot();
    CPlusPlus::Snapshot newDocTable;

    for  (CPlusPlus::Snapshot::iterator it = docTable.begin(); it != docTable.end(); ++it) {
        const ProjectExplorer::Project *project = ProjectExplorer::ProjectExplorerPlugin::instance()->session()->projectForFile(it.key());
        if (project == uiProject)
            newDocTable.insert(it.value());
    }

    docTable = newDocTable;

    // take all docs, find the ones that include the ui_xx.h.
    QList<Document::Ptr> docList = findDocumentsIncluding(docTable, uicedName, true); // change to false when we know the absolute path to generated ui_<>.h file

    if (Designer::Constants::Internal::debug)
        qDebug() << Q_FUNC_INFO << objectName << signalSignature << "Looking for " << uicedName << " returned " << docList.size();
    if (docList.isEmpty()) {
        *errorMessage = tr("No documents matching '%1' could be found.\nRebuilding the project might help.").arg(uicedName);
        return false;
    }

    QDesignerFormWindowInterface *fwi = ed.widgetHost->formWindow();

    const QString uiClass = uiClassName(fwi->mainContainer()->objectName());

    if (Designer::Constants::Internal::debug)
        qDebug() << "Checking docs for " << uiClass;

    // Find the class definition (ui class defined as member or base class)
    // in the file itself or in the directly included files (order 1).
    QString namespaceName;
    const Class *cl = 0;
    Document::Ptr doc;

    foreach (const Document::Ptr &d, docList) {
        const ClassDocumentPtrPair cd = findClassRecursively(docTable, d, uiClass, 1u , &namespaceName);
        if (cd.first) {
            cl = cd.first;
            doc = cd.second;
            break;
        }
    }
    if (!cl) {
        *errorMessage = msgClassNotFound(uiClass, docList);
        return false;
    }

    Overview o;
    const QString className = namespaceName + o.prettyName(cl->name());
    if (Designer::Constants::Internal::debug)
        qDebug() << "Found class  " << className << doc->fileName();

    const QString functionName = QLatin1String("on_") + objectName + QLatin1Char('_') + signalSignature;
    const QString functionNameWithParameterNames = addParameterNames(functionName, parameterNames);

    if (Designer::Constants::Internal::debug)
        qDebug() << Q_FUNC_INFO << "Found " << uiClass << doc->fileName() << " checking " << functionName  << functionNameWithParameterNames;

    int line = 0;
    Document::Ptr sourceDoc;

    if (Function *fun = findDeclaration(cl, functionName)) {
        sourceDoc = findDefinition(fun, &line);
        if (!sourceDoc) {
            // add function definition to cpp file
            sourceDoc = addDefinition(docTable, doc->fileName(), className, functionNameWithParameterNames, &line);
        }
    } else {
        // add function declaration to cl
        CppModelManagerInterface::WorkingCopy workingCopy =
            CppModelManagerInterface::instance()->workingCopy();
        const QString fileName = doc->fileName();
        getParsedDocument(fileName, workingCopy, docTable);
        addDeclaration(docTable, fileName, cl, functionNameWithParameterNames);

//.........这里部分代码省略.........