cppeditor.cpp 27 KB
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/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing
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**
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** This file is part of Qt Creator.
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**
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** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company.  For licensing terms and
** conditions see http://www.qt.io/terms-conditions.  For further information
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** use the contact form at http://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file.  Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, The Qt Company gives you certain additional
** rights.  These rights are described in The Qt Company LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
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****************************************************************************/
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#include "cppeditor.h"
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#include "cppautocompleter.h"
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#include "cppcanonicalsymbol.h"
#include "cppdocumentationcommenthelper.h"
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#include "cppeditorconstants.h"
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#include "cppeditordocument.h"
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#include "cppeditoroutline.h"
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#include "cppeditorplugin.h"
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#include "cppfollowsymbolundercursor.h"
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#include "cpphighlighter.h"
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#include "cpplocalrenaming.h"
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#include "cpppreprocessordialog.h"
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#include "cppquickfixassistant.h"
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#include "cppuseselectionsupdater.h"
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#include <coreplugin/actionmanager/actioncontainer.h>
#include <coreplugin/actionmanager/actionmanager.h>
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#include <cpptools/cppchecksymbols.h>
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#include <cpptools/cppchecksymbols.h>
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#include <cpptools/cppcodeformatter.h>
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#include <cpptools/cppcompletionassistprovider.h>
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#include <cpptools/cppmodelmanager.h>
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#include <cpptools/cppsemanticinfo.h>
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#include <cpptools/cpptoolsconstants.h>
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#include <cpptools/cpptoolsplugin.h>
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#include <cpptools/cpptoolsreuse.h>
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#include <cpptools/cppworkingcopy.h>
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#include <cpptools/symbolfinder.h>
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#include <texteditor/completionsettings.h>
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#include <texteditor/textdocument.h>
#include <texteditor/textdocumentlayout.h>
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#include <texteditor/texteditorsettings.h>
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#include <texteditor/codeassist/assistproposalitem.h>
#include <texteditor/codeassist/genericproposalmodel.h>
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#include <texteditor/codeassist/genericproposal.h>
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#include <texteditor/fontsettings.h>
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#include <texteditor/refactoroverlay.h>
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#include <cplusplus/ASTPath.h>
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#include <utils/qtcassert.h>
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#include <QAction>
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#include <QElapsedTimer>
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#include <QFutureWatcher>
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#include <QMenu>
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#include <QPointer>
#include <QSignalMapper>
#include <QTextEdit>
#include <QTimer>
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#include <QToolButton>
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enum { UPDATE_FUNCTION_DECL_DEF_LINK_INTERVAL = 200 };
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using namespace Core;
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using namespace CPlusPlus;
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using namespace CppTools;
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using namespace TextEditor;
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namespace CppEditor {
namespace Internal {

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CppEditor::CppEditor()
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{
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    addContext(ProjectExplorer::Constants::LANG_CXX);
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}

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Q_GLOBAL_STATIC(CppTools::SymbolFinder, symbolFinder)

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class CppEditorWidgetPrivate
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{
public:
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    CppEditorWidgetPrivate(CppEditorWidget *q);
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public:
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    QPointer<CppTools::CppModelManager> m_modelManager;
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    CppEditorDocument *m_cppEditorDocument;
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    CppEditorOutline *m_cppEditorOutline;

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    CppDocumentationCommentHelper m_cppDocumentationCommentHelper;

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    QTimer m_updateFunctionDeclDefLinkTimer;
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    CppLocalRenaming m_localRenaming;
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    CppTools::SemanticInfo m_lastSemanticInfo;
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    QuickFixOperations m_quickFixes;
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    CppUseSelectionsUpdater m_useSelectionsUpdater;
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    FunctionDeclDefLinkFinder *m_declDefLinkFinder;
    QSharedPointer<FunctionDeclDefLink> m_declDefLink;

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

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CppEditorWidgetPrivate::CppEditorWidgetPrivate(CppEditorWidget *q)
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    : m_modelManager(CppModelManager::instance())
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    , m_cppEditorDocument(qobject_cast<CppEditorDocument *>(q->textDocument()))
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    , m_cppEditorOutline(new CppEditorOutline(q))
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    , m_cppDocumentationCommentHelper(q)
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    , m_localRenaming(q)
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    , m_useSelectionsUpdater(q)
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    , m_declDefLinkFinder(new FunctionDeclDefLinkFinder(q))
    , m_followSymbolUnderCursor(new FollowSymbolUnderCursor(q))
    , m_preprocessorButton(0)
{
}

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CppEditorWidget::CppEditorWidget()
   : d(new CppEditorWidgetPrivate(this))
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{
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    qRegisterMetaType<SemanticInfo>("CppTools::SemanticInfo");
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}
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void CppEditorWidget::finalizeInitialization()
{
    d->m_cppEditorDocument = qobject_cast<CppEditorDocument *>(textDocument());
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    setLanguageSettingsId(CppTools::Constants::CPP_SETTINGS_ID);
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    // function combo box sorting
    connect(CppEditorPlugin::instance(), &CppEditorPlugin::outlineSortingChanged,
            outline(), &CppEditorOutline::setSorted);

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    connect(d->m_cppEditorDocument, &CppEditorDocument::codeWarningsUpdated,
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            this, &CppEditorWidget::onCodeWarningsUpdated);
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    connect(d->m_cppEditorDocument, &CppEditorDocument::ifdefedOutBlocksUpdated,
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            this, &CppEditorWidget::onIfdefedOutBlocksUpdated);
    connect(d->m_cppEditorDocument, SIGNAL(cppDocumentUpdated(CPlusPlus::Document::Ptr)),
            this, SLOT(onCppDocumentUpdated()));
    connect(d->m_cppEditorDocument, SIGNAL(semanticInfoUpdated(CppTools::SemanticInfo)),
            this, SLOT(updateSemanticInfo(CppTools::SemanticInfo)));
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    connect(d->m_declDefLinkFinder, SIGNAL(foundLink(QSharedPointer<FunctionDeclDefLink>)),
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            this, SLOT(onFunctionDeclDefLinkFound(QSharedPointer<FunctionDeclDefLink>)));
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    connect(&d->m_useSelectionsUpdater,
            SIGNAL(selectionsForVariableUnderCursorUpdated(QList<QTextEdit::ExtraSelection>)),
            &d->m_localRenaming,
            SLOT(updateSelectionsForVariableUnderCursor(QList<QTextEdit::ExtraSelection>)));
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    connect(&d->m_useSelectionsUpdater, &CppUseSelectionsUpdater::finished,
            [this] (CppTools::SemanticInfo::LocalUseMap localUses) {
                QTC_CHECK(isSemanticInfoValidExceptLocalUses());
                d->m_lastSemanticInfo.localUsesUpdated = true;
                d->m_lastSemanticInfo.localUses = localUses;
    });
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    connect(document(), SIGNAL(contentsChange(int,int,int)),
            &d->m_localRenaming, SLOT(onContentsChangeOfEditorWidgetDocument(int,int,int)));
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    connect(&d->m_localRenaming, &CppLocalRenaming::finished, [this] {
        cppEditorDocument()->semanticRehighlight();
    });
    connect(&d->m_localRenaming, &CppLocalRenaming::processKeyPressNormally,
            this, &CppEditorWidget::processKeyNormally);
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    connect(this, SIGNAL(cursorPositionChanged()),
            d->m_cppEditorOutline, SLOT(updateIndex()));
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    connect(cppEditorDocument(), &CppEditorDocument::preprocessorSettingsChanged,
            [this](bool customSettings) {
        d->m_preprocessorButton->setProperty("highlightWidget", customSettings);
        d->m_preprocessorButton->update();
    });

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    // set up function declaration - definition link
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    d->m_updateFunctionDeclDefLinkTimer.setSingleShot(true);
    d->m_updateFunctionDeclDefLinkTimer.setInterval(UPDATE_FUNCTION_DECL_DEF_LINK_INTERVAL);
    connect(&d->m_updateFunctionDeclDefLinkTimer, SIGNAL(timeout()),
            this, SLOT(updateFunctionDeclDefLinkNow()));
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    connect(this, SIGNAL(cursorPositionChanged()), this, SLOT(updateFunctionDeclDefLink()));
    connect(this, SIGNAL(textChanged()), this, SLOT(updateFunctionDeclDefLink()));
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    // set up the use highlighitng
    connect(this, &CppEditorWidget::cursorPositionChanged, [this]() {
        if (!d->m_localRenaming.isActive())
            d->m_useSelectionsUpdater.scheduleUpdate();
    });
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    // Tool bar creation
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    d->m_preprocessorButton = new QToolButton(this);
    d->m_preprocessorButton->setText(QLatin1String("#"));
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    Command *cmd = ActionManager::command(Constants::OPEN_PREPROCESSOR_DIALOG);
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    connect(cmd, SIGNAL(keySequenceChanged()), this, SLOT(updatePreprocessorButtonTooltip()));
    updatePreprocessorButtonTooltip();
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    connect(d->m_preprocessorButton, SIGNAL(clicked()), this, SLOT(showPreProcessorWidget()));
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    insertExtraToolBarWidget(TextEditorWidget::Left, d->m_preprocessorButton);
    insertExtraToolBarWidget(TextEditorWidget::Left, d->m_cppEditorOutline->widget());
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}
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void CppEditorWidget::finalizeInitializationAfterDuplication(TextEditorWidget *other)
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{
    QTC_ASSERT(other, return);
    CppEditorWidget *cppEditorWidget = qobject_cast<CppEditorWidget *>(other);
    QTC_ASSERT(cppEditorWidget, return);

    if (cppEditorWidget->isSemanticInfoValidExceptLocalUses())
        updateSemanticInfo(cppEditorWidget->semanticInfo());
    d->m_cppEditorOutline->update();
    const ExtraSelectionKind selectionKind = CodeWarningsSelection;
    setExtraSelections(selectionKind, cppEditorWidget->extraSelections(selectionKind));
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}

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CppEditorWidget::~CppEditorWidget()
{
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    // non-inline destructor, see section "Forward Declared Pointers" of QScopedPointer.
}

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CppEditorDocument *CppEditorWidget::cppEditorDocument() const
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{
    return d->m_cppEditorDocument;
}

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

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

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    TextEditorWidget::paste();
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}

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void CppEditorWidget::cut()
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{
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    if (d->m_localRenaming.handleCut())
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        return;

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    TextEditorWidget::cut();
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}

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void CppEditorWidget::selectAll()
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{
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    if (d->m_localRenaming.handleSelectAll())
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        return;
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    TextEditorWidget::selectAll();
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}

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void CppEditorWidget::onCppDocumentUpdated()
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{
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    d->m_cppEditorOutline->update();
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}

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void CppEditorWidget::onCodeWarningsUpdated(unsigned revision,
                                            const QList<QTextEdit::ExtraSelection> selections)
{
    if (revision != documentRevision())
        return;
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    setExtraSelections(TextEditorWidget::CodeWarningsSelection, selections);
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}

void CppEditorWidget::onIfdefedOutBlocksUpdated(unsigned revision,
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    const QList<BlockRange> ifdefedOutBlocks)
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{
    if (revision != documentRevision())
        return;
    setIfdefedOutBlocks(ifdefedOutBlocks);
}

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

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    SemanticInfo info = d->m_lastSemanticInfo;
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    info.snapshot = CppModelManager::instance()->snapshot();
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    info.snapshot.insert(info.doc);
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    if (const Macro *macro = CppTools::findCanonicalMacro(textCursor(), info.doc)) {
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        d->m_modelManager->findMacroUsages(*macro);
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    } else {
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        CanonicalSymbol cs(info.doc, info.snapshot);
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        Symbol *canonicalSymbol = cs(textCursor());
        if (canonicalSymbol)
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            d->m_modelManager->findUsages(canonicalSymbol, cs.context());
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    }
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}

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

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

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

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void CppEditorWidget::renameSymbolUnderCursor()
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{
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    d->m_useSelectionsUpdater.abortSchedule();
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    updateSemanticInfo(d->m_cppEditorDocument->recalculateSemanticInfo(),
                       /*updateUseSelectionSynchronously=*/ true);
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    if (!d->m_localRenaming.start()) // Rename local symbol
        renameUsages(); // Rename non-local symbol or macro
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}

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

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

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    if (!d->m_lastSemanticInfo.doc)
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        return;
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    // Find function declaration or definition under cursor
    Function *functionDefinitionSymbol = 0;
    Symbol *functionDeclarationSymbol = 0;

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    ASTPath astPathFinder(d->m_lastSemanticInfo.doc);
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    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!
                    }
                }
            }
        }
    }
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    // Link to function definition/declaration
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    CppEditorWidget::Link symbolLink;
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    if (functionDeclarationSymbol) {
        symbolLink = linkToSymbol(symbolFinder()
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            ->findMatchingDefinition(functionDeclarationSymbol, d->m_modelManager->snapshot()));
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    } else if (functionDefinitionSymbol) {
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        const Snapshot snapshot = d->m_modelManager->snapshot();
        LookupContext context(d->m_lastSemanticInfo.doc, snapshot);
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        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()) {
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                    if (funTy->match(functionDefinitionSymbol)) {
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                        if (decl != functionDefinitionSymbol && binding == r.binding())
                            best.prepend(decl);
                        else
                            best.append(decl);
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                    }
                }
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            }
        }
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        if (best.isEmpty())
            return;
        symbolLink = linkToSymbol(best.first());
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    }
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    // Open Editor at link position
    if (symbolLink.hasValidTarget())
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        openLink(symbolLink, inNextSplit != alwaysOpenLinksInNextSplit());
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}

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CppEditorWidget::Link CppEditorWidget::findLinkAt(const QTextCursor &cursor, bool resolveTarget,
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                                                  bool inNextSplit)
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{
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    if (!d->m_modelManager)
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        return Link();
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    return d->m_followSymbolUnderCursor->findLink(cursor, resolveTarget,
                                                  d->m_modelManager->snapshot(),
                                                  d->m_lastSemanticInfo.doc,
                                                  symbolFinder(),
                                                  inNextSplit);
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}

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unsigned CppEditorWidget::documentRevision() const
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{
    return document()->revision();
}

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bool CppEditorWidget::isSemanticInfoValidExceptLocalUses() const
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{
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    return d->m_lastSemanticInfo.doc
            && d->m_lastSemanticInfo.revision == documentRevision()
            && !d->m_lastSemanticInfo.snapshot.isEmpty();
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}
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bool CppEditorWidget::isSemanticInfoValid() const
{
    return isSemanticInfoValidExceptLocalUses() && d->m_lastSemanticInfo.localUsesUpdated;
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}

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

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

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    return TextEditorWidget::event(e);
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}

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void CppEditorWidget::performQuickFix(int index)
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{
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    d->m_quickFixes.at(index)->perform();
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}

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void CppEditorWidget::processKeyNormally(QKeyEvent *e)
{
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    TextEditorWidget::keyPressEvent(e);
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}

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void CppEditorWidget::contextMenuEvent(QContextMenuEvent *e)
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{
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    // ### enable
    // updateSemanticInfo(m_semanticHighlighter->semanticInfo(currentSource()));

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    QPointer<QMenu> menu(new QMenu(this));
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    ActionContainer *mcontext = ActionManager::actionContainer(Constants::M_CONTEXT);
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    QMenu *contextMenu = mcontext->menu();

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    QMenu *quickFixMenu = new QMenu(tr("&Refactor"), menu);
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    quickFixMenu->addAction(ActionManager::command(Constants::RENAME_SYMBOL_UNDER_CURSOR)->action());
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    QSignalMapper mapper;
    connect(&mapper, SIGNAL(mapped(int)), this, SLOT(performQuickFix(int)));
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    if (isSemanticInfoValidExceptLocalUses()) {
        d->m_useSelectionsUpdater.update(CppUseSelectionsUpdater::Synchronous);
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        AssistInterface *interface = createAssistInterface(QuickFix, ExplicitlyInvoked);
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        if (interface) {
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            QScopedPointer<IAssistProcessor> processor(
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                        CppEditorPlugin::instance()->quickFixProvider()->createProcessor());
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            QScopedPointer<IAssistProposal> proposal(processor->perform(interface));
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            if (!proposal.isNull()) {
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                auto model = static_cast<GenericProposalModel *>(proposal->model());
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                for (int index = 0; index < model->size(); ++index) {
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                    auto item = static_cast<AssistProposalItem *>(model->proposalItem(index));
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                    QuickFixOperation::Ptr op = item->data().value<QuickFixOperation::Ptr>();
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                    d->m_quickFixes.append(op);
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                    QAction *action = quickFixMenu->addAction(op->description());
                    mapper.setMapping(action, index);
                    connect(action, SIGNAL(triggered()), &mapper, SLOT(map()));
                }
                delete model;
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            }
        }
    }

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    foreach (QAction *action, contextMenu->actions()) {
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        menu->addAction(action);
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        if (action->objectName() == QLatin1String(Constants::M_REFACTORING_MENU_INSERTION_POINT))
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            menu->addMenu(quickFixMenu);
    }
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    appendStandardContextMenuActions(menu);

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    menu->exec(e->globalPos());
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    if (!menu)
        return;
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    d->m_quickFixes.clear();
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    delete menu;
}

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void CppEditorWidget::keyPressEvent(QKeyEvent *e)
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{
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    if (d->m_localRenaming.handleKeyPressEvent(e))
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        return;

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    if (handleStringSplitting(e))
        return;

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    if (d->m_cppDocumentationCommentHelper.handleKeyPressEvent(e))
        return;

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    TextEditorWidget::keyPressEvent(e);
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}

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bool CppEditorWidget::handleStringSplitting(QKeyEvent *e) const
{
    if (!TextEditorSettings::completionSettings().m_autoSplitStrings)
        return false;

    if (e->key() == Qt::Key_Return || e->key() == Qt::Key_Enter) {
        QTextCursor cursor = textCursor();

        if (autoCompleter()->isInString(cursor)) {
            cursor.beginEditBlock();
            if (cursor.positionInBlock() > 0
                    && cursor.block().text().at(cursor.positionInBlock() - 1) == QLatin1Char('\\')) {
                // Already escaped: simply go back to line, but do not indent.
                cursor.insertText(QLatin1String("\n"));
            } else if (e->modifiers() & Qt::ShiftModifier) {
                // With 'shift' modifier, escape the end of line character
                // and start at beginning of next line.
                cursor.insertText(QLatin1String("\\\n"));
            } else {
                // End the current string, and start a new one on the line, properly indented.
                cursor.insertText(QLatin1String("\"\n\""));
                textDocument()->autoIndent(cursor);
            }
            cursor.endEditBlock();
            e->accept();
            return true;
        }
    }

    return false;
}

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void CppEditorWidget::applyFontSettings()
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{
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    // This also makes the document apply font settings
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    TextEditorWidget::applyFontSettings();
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}

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void CppEditorWidget::slotCodeStyleSettingsChanged(const QVariant &)
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{
    CppTools::QtStyleCodeFormatter formatter;
    formatter.invalidateCache(document());
}

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CppEditorWidget::Link CppEditorWidget::linkToSymbol(CPlusPlus::Symbol *symbol)
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{
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    if (!symbol)
        return Link();

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    const QString filename = QString::fromUtf8(symbol->fileName(),
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                                               symbol->fileNameLength());
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    unsigned line = symbol->line();
    unsigned column = symbol->column();
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    if (column)
        --column;
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    if (symbol->isGenerated())
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        column = 0;
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    return Link(filename, line, column);
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}

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void CppEditorWidget::updateSemanticInfo(const SemanticInfo &semanticInfo,
                                         bool updateUseSelectionSynchronously)
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{
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    if (semanticInfo.revision != documentRevision())
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        return;
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    d->m_lastSemanticInfo = semanticInfo;
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    if (!d->m_localRenaming.isActive()) {
        const CppUseSelectionsUpdater::CallType type = updateUseSelectionSynchronously
                ? CppUseSelectionsUpdater::Synchronous
                : CppUseSelectionsUpdater::Asynchronous;
        d->m_useSelectionsUpdater.update(type);
    }
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    // schedule a check for a decl/def link
    updateFunctionDeclDefLink();
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}

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AssistInterface *CppEditorWidget::createAssistInterface(AssistKind kind, AssistReason reason) const
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{
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    if (kind == Completion) {
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        if (CppCompletionAssistProvider *cap =
                qobject_cast<CppCompletionAssistProvider *>(cppEditorDocument()->completionAssistProvider())) {
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            return cap->createAssistInterface(
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                            textDocument()->filePath(),
                            document(),
                            cppEditorDocument()->isObjCEnabled(),
                            position(),
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                            reason);
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        }
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    } else if (kind == QuickFix) {
        if (isSemanticInfoValid())
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            return new CppQuickFixInterface(const_cast<CppEditorWidget *>(this), reason);
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    } else {
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        return TextEditorWidget::createAssistInterface(kind, reason);
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    }
    return 0;
}

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QSharedPointer<FunctionDeclDefLink> CppEditorWidget::declDefLink() const
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{
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    return d->m_declDefLink;
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}

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void CppEditorWidget::onRefactorMarkerClicked(const RefactorMarker &marker)
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{
    if (marker.data.canConvert<FunctionDeclDefLink::Marker>())
        applyDeclDefLinkChanges(true);
}

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void CppEditorWidget::updateFunctionDeclDefLink()
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{
    const int pos = textCursor().selectionStart();

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    // if there's already a link, abort it if the cursor is outside or the name changed
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    // (adding a prefix is an exception since the user might type a return type)
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    if (d->m_declDefLink
            && (pos < d->m_declDefLink->linkSelection.selectionStart()
                || pos > d->m_declDefLink->linkSelection.selectionEnd()
                || !d->m_declDefLink->nameSelection.selectedText().trimmed()
                    .endsWith(d->m_declDefLink->nameInitial))) {
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        abortDeclDefLink();
        return;
    }

    // don't start a new scan if there's one active and the cursor is already in the scanned area
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    const QTextCursor scannedSelection = d->m_declDefLinkFinder->scannedSelection();
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    if (!scannedSelection.isNull()
            && scannedSelection.selectionStart() <= pos
            && scannedSelection.selectionEnd() >= pos) {
        return;
    }

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    d->m_updateFunctionDeclDefLinkTimer.start();
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}

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void CppEditorWidget::updateFunctionDeclDefLinkNow()
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{
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    static bool noTracking = qgetenv("QTC_NO_FUNCTION_DECL_DEF_LINK_TRACKING").trimmed() == "1";
    if (noTracking)
        return;

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    IEditor *editor = EditorManager::currentEditor();
    if (!editor || editor->widget() != this)
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        return;
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    const Snapshot semanticSnapshot = d->m_lastSemanticInfo.snapshot;
    const Document::Ptr semanticDoc = d->m_lastSemanticInfo.doc;
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    if (d->m_declDefLink) {
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        // update the change marker
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        const Utils::ChangeSet changes = d->m_declDefLink->changes(semanticSnapshot);
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        if (changes.isEmpty())
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            d->m_declDefLink->hideMarker(this);
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        else
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            d->m_declDefLink->showMarker(this);
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        return;
    }
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    if (!isSemanticInfoValidExceptLocalUses())
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        return;

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    Snapshot snapshot = CppModelManager::instance()->snapshot();
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    snapshot.insert(semanticDoc);
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    d->m_declDefLinkFinder->startFindLinkAt(textCursor(), semanticDoc, snapshot);
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}

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void CppEditorWidget::onFunctionDeclDefLinkFound(QSharedPointer<FunctionDeclDefLink> link)
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{
    abortDeclDefLink();
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    d->m_declDefLink = link;
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    IDocument *targetDocument = DocumentModel::documentForFilePath( d->m_declDefLink->targetFile->fileName());
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    if (textDocument() != targetDocument) {
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        if (auto textDocument = qobject_cast<BaseTextDocument *>(targetDocument))
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            connect(textDocument, SIGNAL(contentsChanged()),
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                    this, SLOT(abortDeclDefLink()));
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    }
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}

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void CppEditorWidget::applyDeclDefLinkChanges(bool jumpToMatch)
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{
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    if (!d->m_declDefLink)
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        return;
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    d->m_declDefLink->apply(this, jumpToMatch);
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    abortDeclDefLink();
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    updateFunctionDeclDefLink();
}

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FollowSymbolUnderCursor *CppEditorWidget::followSymbolUnderCursorDelegate()
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{
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    return d->m_followSymbolUnderCursor.data();
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}

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void CppEditorWidget::abortDeclDefLink()
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{
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    if (!d->m_declDefLink)
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        return;
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    IDocument *targetDocument = DocumentModel::documentForFilePath(d->m_declDefLink->targetFile->fileName());
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    if (textDocument() != targetDocument) {
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        if (auto textDocument = qobject_cast<BaseTextDocument *>(targetDocument))
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            disconnect(textDocument, SIGNAL(contentsChanged()),
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                    this, SLOT(abortDeclDefLink()));
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    }

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    d->m_declDefLink->hideMarker(this);
    d->m_declDefLink.clear();
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}

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void CppEditorWidget::showPreProcessorWidget()
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{
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    const QString &fileName = textDocument()->filePath();
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    // Check if this editor belongs to a project
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    QList<ProjectPart::Ptr> projectParts = d->m_modelManager->projectPart(fileName);
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    if (projectParts.isEmpty())
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        projectParts = d->m_modelManager->projectPartFromDependencies(fileName);
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    if (projectParts.isEmpty())