cppeditor.cpp

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#include "cppeditor.h"

#include "cppautocompleter.h"
#include "cppeditorconstants.h"
#include "cppeditoroutline.h"
#include "cppeditorplugin.h"
#include "cppdocumentationcommenthelper.h"
#include "cppfollowsymbolundercursor.h"
#include "cpphighlighter.h"
#include "cpplocalrenaming.h"
#include "cpppreprocessordialog.h"
#include "cppquickfixassistant.h"

#include <coreplugin/actionmanager/actioncontainer.h>
#include <coreplugin/actionmanager/actionmanager.h>

#include <cpptools/cppchecksymbols.h>
#include <cpptools/cppcodeformatter.h>
#include <cpptools/cppcompletionassistprovider.h>
#include <cpptools/cpphighlightingsupport.h>
#include <cpptools/cppmodelmanagerinterface.h>
#include <cpptools/cppqtstyleindenter.h>
#include <cpptools/cppsemanticinfo.h>
#include <cpptools/cpptoolseditorsupport.h>
#include <cpptools/cpptoolsplugin.h>
#include <cpptools/cpptoolsreuse.h>
#include <cpptools/symbolfinder.h>

#include <projectexplorer/session.h>

#include <texteditor/basetextdocument.h>
#include <texteditor/basetextdocumentlayout.h>
#include <texteditor/codeassist/basicproposalitem.h>
#include <texteditor/codeassist/basicproposalitemlistmodel.h>
#include <texteditor/codeassist/genericproposal.h>
#include <texteditor/fontsettings.h>
#include <texteditor/refactoroverlay.h>

#include <utils/qtcassert.h>

#include <cplusplus/ASTPath.h>
#include <cplusplus/BackwardsScanner.h>
#include <cplusplus/ExpressionUnderCursor.h>
#include <cplusplus/OverviewModel.h>

#include <QAction>
#include <QFutureWatcher>
#include <QMenu>
#include <QPointer>
#include <QSignalMapper>
#include <QTextEdit>
#include <QTimer>
#include <QToolButton>

enum {
    UPDATE_USES_INTERVAL = 500,
    UPDATE_FUNCTION_DECL_DEF_LINK_INTERVAL = 200
};

using namespace CPlusPlus;
using namespace CppTools;
using namespace CppEditor::Internal;

namespace {

class CanonicalSymbol
{
public:
    CPPEditorWidget *editor;
    TypeOfExpression typeOfExpression;
    SemanticInfo info;

    CanonicalSymbol(CPPEditorWidget *editor, const SemanticInfo &info)
        : editor(editor), info(info)
    {
        typeOfExpression.init(info.doc, info.snapshot);
        typeOfExpression.setExpandTemplates(true);
    }

    const LookupContext &context() const
    {
        return typeOfExpression.context();
    }

    Scope *getScopeAndExpression(const QTextCursor &cursor, QString *code)
    {
        return getScopeAndExpression(editor, info, cursor, code);
    }

    static Scope *getScopeAndExpression(CPPEditorWidget *editor, const SemanticInfo &info,
                                        const QTextCursor &cursor,
                                        QString *code)
    {
        if (!info.doc)
            return 0;

        QTextCursor tc = cursor;
        int line, col;
        editor->convertPosition(tc.position(), &line, &col);
        ++col; // 1-based line and 1-based column

        QTextDocument *document = editor->document();

        int pos = tc.position();

        if (!isValidIdentifierChar(document->characterAt(pos)))
            if (!(pos > 0 && isValidIdentifierChar(document->characterAt(pos - 1))))
                return 0;

        while (isValidIdentifierChar(document->characterAt(pos)))
            ++pos;
        tc.setPosition(pos);

        ExpressionUnderCursor expressionUnderCursor;
        *code = expressionUnderCursor(tc);
        return info.doc->scopeAt(line, col);
    }

    Symbol *operator()(const QTextCursor &cursor)
    {
        QString code;

        if (Scope *scope = getScopeAndExpression(cursor, &code))
            return operator()(scope, code);

        return 0;
    }

    Symbol *operator()(Scope *scope, const QString &code)
    {
        return canonicalSymbol(scope, code, typeOfExpression);
    }

    static Symbol *canonicalSymbol(Scope *scope, const QString &code,
                                   TypeOfExpression &typeOfExpression)
    {
        const QList<LookupItem> results =
                typeOfExpression(code.toUtf8(), scope, TypeOfExpression::Preprocess);

        for (int i = results.size() - 1; i != -1; --i) {
            const LookupItem &r = results.at(i);
            Symbol *decl = r.declaration();

            if (!(decl && decl->enclosingScope()))
                break;

            if (Class *classScope = r.declaration()->enclosingScope()->asClass()) {
                const Identifier *declId = decl->identifier();
                const Identifier *classId = classScope->identifier();

                if (classId && classId->match(declId))
                    continue; // skip it, it's a ctor or a dtor.

                if (Function *funTy = r.declaration()->type()->asFunctionType()) {
                    if (funTy->isVirtual())
                        return r.declaration();
                }
            }
        }

        for (int i = 0; i < results.size(); ++i) {
            const LookupItem &r = results.at(i);

            if (r.declaration())
                return r.declaration();
        }

        return 0;
    }

};

QTimer *newSingleShotTimer(QObject *parent, int msecInterval)
{
    QTimer *timer = new QTimer(parent);
    timer->setSingleShot(true);
    timer->setInterval(msecInterval);
    return timer;
}

} // end of anonymous namespace

namespace CppEditor {
namespace Internal {

CPPEditor::CPPEditor(CPPEditorWidget *editor)
    : BaseTextEditor(editor)
{
    m_context.add(CppEditor::Constants::C_CPPEDITOR);
    m_context.add(ProjectExplorer::Constants::LANG_CXX);
    m_context.add(TextEditor::Constants::C_TEXTEDITOR);
    setDuplicateSupported(true);
}

Q_GLOBAL_STATIC(CppTools::SymbolFinder, symbolFinder)

class CPPEditorWidgetPrivate
{
public:
    CPPEditorWidgetPrivate(CPPEditorWidget *q);

public:
    CPPEditorWidget *q;

    QPointer<CppTools::CppModelManagerInterface> m_modelManager;

    CPPEditorDocument *m_cppEditorDocument;
    CppEditorOutline *m_cppEditorOutline;

    CppDocumentationCommentHelper m_cppDocumentationCommentHelper;

    QTimer *m_updateUsesTimer;
    QTimer *m_updateFunctionDeclDefLinkTimer;
    QHash<int, QTextCharFormat> m_semanticHighlightFormatMap;

    CppLocalRenaming m_localRenaming;

    CppTools::SemanticInfo m_lastSemanticInfo;
    QList<TextEditor::QuickFixOperation::Ptr> m_quickFixes;

    QScopedPointer<QFutureWatcher<TextEditor::HighlightingResult> > m_highlightWatcher;
    unsigned m_highlightRevision; // the editor revision that requested the highlight

    QScopedPointer<QFutureWatcher<QList<int> > > m_referencesWatcher;
    unsigned m_referencesRevision;
    int m_referencesCursorPosition;

    FunctionDeclDefLinkFinder *m_declDefLinkFinder;
    QSharedPointer<FunctionDeclDefLink> m_declDefLink;

    QScopedPointer<FollowSymbolUnderCursor> m_followSymbolUnderCursor;
    QToolButton *m_preprocessorButton;
};

CPPEditorWidgetPrivate::CPPEditorWidgetPrivate(CPPEditorWidget *q)
    : q(q)
    , m_modelManager(CppModelManagerInterface::instance())
    , m_cppEditorDocument(qobject_cast<CPPEditorDocument *>(q->baseTextDocument()))
    , m_cppEditorOutline(new CppEditorOutline(q))
    , m_cppDocumentationCommentHelper(q)
    , m_localRenaming(q)
    , m_highlightRevision(0)
    , m_referencesRevision(0)
    , m_referencesCursorPosition(0)
    , m_declDefLinkFinder(new FunctionDeclDefLinkFinder(q))
    , m_followSymbolUnderCursor(new FollowSymbolUnderCursor(q))
    , m_preprocessorButton(0)
{
}

CPPEditorWidget::CPPEditorWidget(QWidget *parent)
    : TextEditor::BaseTextEditorWidget(new CPPEditorDocument(), parent)
{
    baseTextDocument()->setIndenter(new CppTools::CppQtStyleIndenter);
    ctor();
}

CPPEditorWidget::CPPEditorWidget(CPPEditorWidget *other)
    : TextEditor::BaseTextEditorWidget(other)
{
    ctor();
}

void CPPEditorWidget::ctor()
{
    d.reset(new CPPEditorWidgetPrivate(this));

    qRegisterMetaType<SemanticInfo>("CppTools::SemanticInfo");

    setParenthesesMatchingEnabled(true);
    setMarksVisible(true);
    setCodeFoldingSupported(true);
    setAutoCompleter(new CppAutoCompleter);

    if (d->m_modelManager) {
        CppEditorSupport *editorSupport = d->m_modelManager->cppEditorSupport(editor());
        connect(editorSupport, SIGNAL(documentUpdated()),
                this, SLOT(onDocumentUpdated()));
        connect(editorSupport, SIGNAL(semanticInfoUpdated(CppTools::SemanticInfo)),
                this, SLOT(updateSemanticInfo(CppTools::SemanticInfo)));
        connect(editorSupport, SIGNAL(highlighterStarted(QFuture<TextEditor::HighlightingResult>*,uint)),
                this, SLOT(highlighterStarted(QFuture<TextEditor::HighlightingResult>*,uint)));
    }

    connect(this, SIGNAL(refactorMarkerClicked(TextEditor::RefactorMarker)),
            this, SLOT(onRefactorMarkerClicked(TextEditor::RefactorMarker)));

    connect(d->m_declDefLinkFinder, SIGNAL(foundLink(QSharedPointer<FunctionDeclDefLink>)),
            this, SLOT(onFunctionDeclDefLinkFound(QSharedPointer<FunctionDeclDefLink>)));

    connect(baseTextDocument(), SIGNAL(filePathChanged(QString,QString)),
            this, SLOT(onFilePathChanged()));

    connect(&d->m_localRenaming, SIGNAL(finished()),
            this, SLOT(onLocalRenamingFinished()));
    connect(&d->m_localRenaming, SIGNAL(processKeyPressNormally(QKeyEvent*)),
            this, SLOT(onLocalRenamingProcessKeyPressNormally(QKeyEvent*)));
}

CPPEditorWidget::~CPPEditorWidget()
{
    if (d->m_modelManager)
        d->m_modelManager->deleteCppEditorSupport(editor());
}

CPPEditorDocument *CPPEditorWidget::cppEditorDocument() const
{
    return d->m_cppEditorDocument;
}

CppEditorOutline *CPPEditorWidget::outline() const
{
    return d->m_cppEditorOutline;
}

TextEditor::BaseTextEditor *CPPEditorWidget::createEditor()
{
    CPPEditor *editable = new CPPEditor(this);
    createToolBar(editable);
    return editable;
}

void CPPEditorWidget::createToolBar(CPPEditor *editor)
{
    d->m_updateUsesTimer = newSingleShotTimer(this, UPDATE_USES_INTERVAL);
    connect(d->m_updateUsesTimer, SIGNAL(timeout()), this, SLOT(updateUsesNow()));

    d->m_updateFunctionDeclDefLinkTimer = newSingleShotTimer(this, UPDATE_FUNCTION_DECL_DEF_LINK_INTERVAL);
    connect(d->m_updateFunctionDeclDefLinkTimer, SIGNAL(timeout()),
            this, SLOT(updateFunctionDeclDefLinkNow()));

    connect(this, SIGNAL(cursorPositionChanged()),
            d->m_cppEditorOutline, SLOT(updateIndex()));

    // set up slots to document changes
    connect(document(), SIGNAL(contentsChange(int,int,int)),
            this, SLOT(onContentsChanged(int,int,int)));

    // set up function declaration - definition link
    connect(this, SIGNAL(cursorPositionChanged()), this, SLOT(updateFunctionDeclDefLink()));
    connect(this, SIGNAL(textChanged()), this, SLOT(updateFunctionDeclDefLink()));

    // set up the semantic highlighter
    connect(this, SIGNAL(cursorPositionChanged()), this, SLOT(updateUses()));
    connect(this, SIGNAL(textChanged()), this, SLOT(updateUses()));

    d->m_preprocessorButton = new QToolButton(this);
    d->m_preprocessorButton->setText(QLatin1String("#"));
    Core::Command *cmd = Core::ActionManager::command(Constants::OPEN_PREPROCESSOR_DIALOG);
    connect(cmd, SIGNAL(keySequenceChanged()), this, SLOT(updatePreprocessorButtonTooltip()));
    updatePreprocessorButtonTooltip();
    connect(d->m_preprocessorButton, SIGNAL(clicked()), this, SLOT(showPreProcessorWidget()));
    editor->insertExtraToolBarWidget(TextEditor::BaseTextEditor::Left, d->m_preprocessorButton);
    editor->insertExtraToolBarWidget(TextEditor::BaseTextEditor::Left, d->m_cppEditorOutline->widget());
}

void CPPEditorWidget::paste()
{
    if (d->m_localRenaming.handlePaste())
        return;

    BaseTextEditorWidget::paste();
}

void CPPEditorWidget::cut()
{
    if (d->m_localRenaming.handlePaste())
        return;

    BaseTextEditorWidget::cut();
}

void CPPEditorWidget::selectAll()
{
    if (d->m_localRenaming.handleSelectAll())
        return;

    BaseTextEditorWidget::selectAll();
}

/// \brief Called by \c CppEditorSupport when the document corresponding to the
///        file in this editor is updated.
void CPPEditorWidget::onDocumentUpdated()
{
    d->m_cppEditorOutline->update();
}

const Macro *CPPEditorWidget::findCanonicalMacro(const QTextCursor &cursor, Document::Ptr doc) const
{
    if (!doc)
        return 0;

    int line, col;
    convertPosition(cursor.position(), &line, &col);

    if (const Macro *macro = doc->findMacroDefinitionAt(line)) {
        QTextCursor macroCursor = cursor;
        const QByteArray name = identifierUnderCursor(&macroCursor).toUtf8();
        if (macro->name() == name)
            return macro;
    } else if (const Document::MacroUse *use = doc->findMacroUseAt(cursor.position())) {
        return &use->macro();
    }

    return 0;
}

void CPPEditorWidget::findUsages()
{
    if (!d->m_modelManager)
        return;

    SemanticInfo info = d->m_lastSemanticInfo;
    info.snapshot = CppModelManagerInterface::instance()->snapshot();
    info.snapshot.insert(info.doc);

    if (const Macro *macro = findCanonicalMacro(textCursor(), info.doc)) {
        d->m_modelManager->findMacroUsages(*macro);
    } else {
        CanonicalSymbol cs(this, info);
        Symbol *canonicalSymbol = cs(textCursor());
        if (canonicalSymbol)
            d->m_modelManager->findUsages(canonicalSymbol, cs.context());
    }
}

void CPPEditorWidget::renameUsages(const QString &replacement)
{
    if (!d->m_modelManager)
        return;

    SemanticInfo info = d->m_lastSemanticInfo;
    info.snapshot = CppModelManagerInterface::instance()->snapshot();
    info.snapshot.insert(info.doc);

    if (const Macro *macro = findCanonicalMacro(textCursor(), info.doc)) {
        d->m_modelManager->renameMacroUsages(*macro, replacement);
    } else {
        CanonicalSymbol cs(this, info);
        if (Symbol *canonicalSymbol = cs(textCursor()))
            if (canonicalSymbol->identifier() != 0)
                d->m_modelManager->renameUsages(canonicalSymbol, cs.context(), replacement);
    }
}

void CPPEditorWidget::markSymbolsNow()
{
    QTC_ASSERT(d->m_referencesWatcher, return);
    if (!d->m_referencesWatcher->isCanceled()
            && d->m_referencesCursorPosition == position()
            && d->m_referencesRevision == editorRevision()) {
        const SemanticInfo info = d->m_lastSemanticInfo;
        TranslationUnit *unit = info.doc->translationUnit();
        const QList<int> result = d->m_referencesWatcher->result();

        QList<QTextEdit::ExtraSelection> selections;

        foreach (int index, result) {
            unsigned line, column;
            unit->getTokenPosition(index, &line, &column);

            if (column)
                --column;  // adjust the column position.

            const int len = unit->tokenAt(index).utf16chars();

            QTextCursor cursor(document()->findBlockByNumber(line - 1));
            cursor.setPosition(cursor.position() + column);
            cursor.setPosition(cursor.position() + len, QTextCursor::KeepAnchor);

            QTextEdit::ExtraSelection sel;
            sel.format = textCharFormat(TextEditor::C_OCCURRENCES);
            sel.cursor = cursor;
            selections.append(sel);
        }

        setExtraSelections(CodeSemanticsSelection, selections);
    }
    d->m_referencesWatcher.reset();
}

static QList<int> lazyFindReferences(Scope *scope, QString code, Document::Ptr doc,
                                     Snapshot snapshot)
{
    TypeOfExpression typeOfExpression;
    snapshot.insert(doc);
    typeOfExpression.init(doc, snapshot);
    // make possible to instantiate templates
    typeOfExpression.setExpandTemplates(true);
    if (Symbol *canonicalSymbol = CanonicalSymbol::canonicalSymbol(scope, code, typeOfExpression))
        return CppModelManagerInterface::instance()->references(canonicalSymbol,
                                                                typeOfExpression.context());
    return QList<int>();
}

void CPPEditorWidget::markSymbols(const QTextCursor &tc, const SemanticInfo &info)
{
    d->m_localRenaming.stop();

    if (!info.doc)
        return;
    const QTextCharFormat &occurrencesFormat = textCharFormat(TextEditor::C_OCCURRENCES);
    if (const Macro *macro = findCanonicalMacro(textCursor(), info.doc)) {
        QList<QTextEdit::ExtraSelection> selections;

        //Macro definition
        if (macro->fileName() == info.doc->fileName()) {
            QTextCursor cursor(document());
            cursor.setPosition(macro->utf16CharOffset());
            cursor.movePosition(QTextCursor::NextCharacter, QTextCursor::KeepAnchor,
                                macro->nameToQString().size());

            QTextEdit::ExtraSelection sel;
            sel.format = occurrencesFormat;
            sel.cursor = cursor;
            selections.append(sel);
        }

        //Other macro uses
        foreach (const Document::MacroUse &use, info.doc->macroUses()) {
            const Macro &useMacro = use.macro();
            if (useMacro.line() != macro->line()
                    || useMacro.utf16CharOffset() != macro->utf16CharOffset()
                    || useMacro.length() != macro->length()
                    || useMacro.fileName() != macro->fileName())
                continue;

            QTextCursor cursor(document());
            cursor.setPosition(use.utf16charsBegin());
            cursor.setPosition(use.utf16charsEnd(), QTextCursor::KeepAnchor);

            QTextEdit::ExtraSelection sel;
            sel.format = occurrencesFormat;
            sel.cursor = cursor;
            selections.append(sel);
        }

        setExtraSelections(CodeSemanticsSelection, selections);
    } else {
        CanonicalSymbol cs(this, info);
        QString expression;
        if (Scope *scope = cs.getScopeAndExpression(this, info, tc, &expression)) {
            if (d->m_referencesWatcher)
                d->m_referencesWatcher->cancel();
            d->m_referencesWatcher.reset(new QFutureWatcher<QList<int> >);
            connect(d->m_referencesWatcher.data(), SIGNAL(finished()), SLOT(markSymbolsNow()));

            d->m_referencesRevision = info.revision;
            d->m_referencesCursorPosition = position();
            d->m_referencesWatcher->setFuture(
                QtConcurrent::run(&lazyFindReferences, scope, expression, info.doc, info.snapshot));
        } else {
            const QList<QTextEdit::ExtraSelection> selections = extraSelections(CodeSemanticsSelection);

            if (!selections.isEmpty())
                setExtraSelections(CodeSemanticsSelection, QList<QTextEdit::ExtraSelection>());
        }
    }
}

void CPPEditorWidget::renameSymbolUnderCursor()
{
    if (!d->m_modelManager)
        return;

    CppEditorSupport *ces = d->m_modelManager->cppEditorSupport(editor());
    updateSemanticInfo(ces->recalculateSemanticInfo());

    if (!d->m_localRenaming.start()) // Rename local symbol
        renameUsages(); // Rename non-local symbol or macro
}

void CPPEditorWidget::onContentsChanged(int position, int charsRemoved, int charsAdded)
{
    Q_UNUSED(position)
    Q_UNUSED(charsAdded)

    if (charsRemoved > 0)
        updateUses();
}

void CPPEditorWidget::updatePreprocessorButtonTooltip()
{
    QTC_ASSERT(d->m_preprocessorButton, return);
    Core::Command *cmd = Core::ActionManager::command(Constants::OPEN_PREPROCESSOR_DIALOG);
    QTC_ASSERT(cmd, return);
    d->m_preprocessorButton->setToolTip(cmd->action()->toolTip());
}

QList<QTextEdit::ExtraSelection> CPPEditorWidget::createSelectionsFromUses(
        const QList<SemanticInfo::Use> &uses)
{
    QList<QTextEdit::ExtraSelection> result;
    const bool isUnused = uses.size() == 1;

    foreach (const SemanticInfo::Use &use, uses) {
        if (use.isInvalid())
            continue;

        QTextEdit::ExtraSelection sel;
        if (isUnused)
            sel.format = textCharFormat(TextEditor::C_OCCURRENCES_UNUSED);
        else
            sel.format = textCharFormat(TextEditor::C_OCCURRENCES);

        const int position = document()->findBlockByNumber(use.line - 1).position() + use.column - 1;
        const int anchor = position + use.length;

        sel.cursor = QTextCursor(document());
        sel.cursor.setPosition(anchor);
        sel.cursor.setPosition(position, QTextCursor::KeepAnchor);

        result.append(sel);
    }

    return result;
}

void CPPEditorWidget::updateUses()
{
    // Block premature semantic info calculation when editor is created.
    if (d->m_modelManager && d->m_modelManager->cppEditorSupport(editor())->initialized())
        d->m_updateUsesTimer->start();
}

void CPPEditorWidget::updateUsesNow()
{
    if (d->m_localRenaming.isActive())
        return;

    semanticRehighlight();
}

void CPPEditorWidget::highlightSymbolUsages(int from, int to)
{
    if (editorRevision() != d->m_highlightRevision)
        return; // outdated

    else if (!d->m_highlightWatcher || d->m_highlightWatcher->isCanceled())
        return; // aborted

    TextEditor::SyntaxHighlighter *highlighter = baseTextDocument()->syntaxHighlighter();
    QTC_ASSERT(highlighter, return);

    TextEditor::SemanticHighlighter::incrementalApplyExtraAdditionalFormats(
                highlighter, d->m_highlightWatcher->future(), from, to, d->m_semanticHighlightFormatMap);
}

void CPPEditorWidget::finishHighlightSymbolUsages()
{
    QTC_ASSERT(d->m_highlightWatcher, return);
    if (!d->m_highlightWatcher->isCanceled()
            && editorRevision() == d->m_highlightRevision
            && !d->m_lastSemanticInfo.doc.isNull()) {
        TextEditor::SyntaxHighlighter *highlighter = baseTextDocument()->syntaxHighlighter();
        QTC_CHECK(highlighter);
        if (highlighter)
            TextEditor::SemanticHighlighter::clearExtraAdditionalFormatsUntilEnd(highlighter,
                d->m_highlightWatcher->future());
    }
    d->m_highlightWatcher.reset();
}

void CPPEditorWidget::switchDeclarationDefinition(bool inNextSplit)
{
    if (!d->m_modelManager)
        return;

    if (!d->m_lastSemanticInfo.doc)
        return;

    // Find function declaration or definition under cursor
    Function *functionDefinitionSymbol = 0;
    Symbol *functionDeclarationSymbol = 0;

    ASTPath astPathFinder(d->m_lastSemanticInfo.doc);
    const QList<AST *> astPath = astPathFinder(textCursor());

    for (int i = 0, size = astPath.size(); i < size; ++i) {
        AST *ast = astPath.at(i);
        if (FunctionDefinitionAST *functionDefinitionAST = ast->asFunctionDefinition()) {
            if ((functionDefinitionSymbol = functionDefinitionAST->symbol))
                break; // Function definition found!
        } else if (SimpleDeclarationAST *simpleDeclaration = ast->asSimpleDeclaration()) {
            if (List<Symbol *> *symbols = simpleDeclaration->symbols) {
                if (Symbol *symbol = symbols->value) {
                    if (symbol->isDeclaration() && symbol->type()->isFunctionType()) {
                        functionDeclarationSymbol = symbol;
                        break; // Function declaration found!
                    }
                }
            }
        }
    }

    // Link to function definition/declaration
    CPPEditorWidget::Link symbolLink;
    if (functionDeclarationSymbol) {
        symbolLink = linkToSymbol(symbolFinder()
            ->findMatchingDefinition(functionDeclarationSymbol, d->m_modelManager->snapshot()));
    } else if (functionDefinitionSymbol) {
        const Snapshot snapshot = d->m_modelManager->snapshot();
        LookupContext context(d->m_lastSemanticInfo.doc, snapshot);
        ClassOrNamespace *binding = context.lookupType(functionDefinitionSymbol);
        const QList<LookupItem> declarations = context.lookup(functionDefinitionSymbol->name(),
            functionDefinitionSymbol->enclosingScope());

        QList<Symbol *> best;
        foreach (const LookupItem &r, declarations) {
            if (Symbol *decl = r.declaration()) {
                if (Function *funTy = decl->type()->asFunctionType()) {
                    if (funTy->match(functionDefinitionSymbol)) {
                        if (decl != functionDefinitionSymbol && binding == r.binding())
                            best.prepend(decl);
                        else
                            best.append(decl);
                    }
                }
            }
        }

        if (best.isEmpty())
            return;
        symbolLink = linkToSymbol(best.first());
    }

    // Open Editor at link position
    if (symbolLink.hasValidTarget())
        openCppEditorAt(symbolLink, inNextSplit != alwaysOpenLinksInNextSplit());
}

QString CPPEditorWidget::identifierUnderCursor(QTextCursor *macroCursor)
{
    macroCursor->movePosition(QTextCursor::StartOfWord);
    macroCursor->movePosition(QTextCursor::EndOfWord, QTextCursor::KeepAnchor);
    return macroCursor->selectedText();
}

CPPEditorWidget::Link CPPEditorWidget::findLinkAt(const QTextCursor &cursor, bool resolveTarget,
                                                  bool inNextSplit)
{
    if (!d->m_modelManager)
        return Link();

    return d->m_followSymbolUnderCursor->findLink(cursor, resolveTarget,
                                                  d->m_modelManager->snapshot(),
                                                  d->m_lastSemanticInfo.doc,
                                                  symbolFinder(),
                                                  inNextSplit);
}

unsigned CPPEditorWidget::editorRevision() const
{
    return document()->revision();
}

bool CPPEditorWidget::isOutdated() const
{
    if (d->m_lastSemanticInfo.revision != editorRevision())
        return true;

    return false;
}

SemanticInfo CPPEditorWidget::semanticInfo() const
{
    return d->m_lastSemanticInfo;
}

bool CPPEditorWidget::event(QEvent *e)
{
    switch (e->type()) {
    case QEvent::ShortcutOverride:
        // handle escape manually if a rename is active
        if (static_cast<QKeyEvent*>(e)->key() == Qt::Key_Escape && d->m_localRenaming.isActive()) {
            e->accept();
            return true;
        }
        break;
    default:
        break;
    }

    return BaseTextEditorWidget::event(e);
}