cppeditor.cpp 58.1 KB
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/**************************************************************************
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**
** This file is part of Qt Creator
**
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** Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
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**
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** Commercial Usage
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**
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** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
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**
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** GNU Lesser General Public License Usage
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**
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** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** If you are unsure which license is appropriate for your use, please
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** contact the sales department at http://qt.nokia.com/contact.
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**
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**************************************************************************/
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#include "cppeditor.h"
#include "cppeditorconstants.h"
#include "cppplugin.h"
#include "cpphighlighter.h"

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#include <cpptools/cpptoolsplugin.h>

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#include <AST.h>
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#include <Control.h>
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#include <Token.h>
#include <Scope.h>
#include <Symbols.h>
#include <Names.h>
#include <Control.h>
#include <CoreTypes.h>
#include <Literals.h>
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#include <PrettyPrinter.h>
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#include <Semantic.h>
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#include <SymbolVisitor.h>
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#include <TranslationUnit.h>
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#include <cplusplus/ExpressionUnderCursor.h>
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#include <cplusplus/TypeOfExpression.h>
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#include <cplusplus/LookupContext.h>
#include <cplusplus/Overview.h>
#include <cplusplus/OverviewModel.h>
#include <cplusplus/SimpleLexer.h>
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#include <cplusplus/TokenUnderCursor.h>
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#include <cplusplus/TypeOfExpression.h>
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#include <cplusplus/MatchingText.h>
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#include <cplusplus/BackwardsScanner.h>
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#include <cpptools/cppmodelmanagerinterface.h>

#include <coreplugin/icore.h>
#include <coreplugin/uniqueidmanager.h>
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#include <coreplugin/actionmanager/actionmanager.h>
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#include <coreplugin/editormanager/ieditor.h>
#include <coreplugin/editormanager/editormanager.h>
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#include <utils/uncommentselection.h>
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#include <extensionsystem/pluginmanager.h>
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#include <projectexplorer/projectexplorerconstants.h>
#include <texteditor/basetextdocument.h>
#include <texteditor/fontsettings.h>
#include <texteditor/texteditorconstants.h>
#include <texteditor/textblockiterator.h>
#include <indenter.h>

#include <QtCore/QDebug>
#include <QtCore/QTime>
#include <QtCore/QTimer>
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#include <QtCore/QStack>
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#include <QtGui/QAction>
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#include <QtGui/QApplication>
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#include <QtGui/QHeaderView>
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#include <QtGui/QLayout>
#include <QtGui/QMenu>
#include <QtGui/QShortcut>
#include <QtGui/QTextEdit>
#include <QtGui/QComboBox>
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#include <QtGui/QToolBar>
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#include <QtGui/QTreeView>
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#include <QtGui/QSortFilterProxyModel>
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#include <sstream>

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enum {
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    UPDATE_METHOD_BOX_INTERVAL = 150,
    UPDATE_USES_INTERVAL = 300
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};

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using namespace CPlusPlus;
using namespace CppEditor::Internal;

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namespace {

class OverviewTreeView : public QTreeView
{
public:
    OverviewTreeView(QWidget *parent = 0)
        : QTreeView(parent)
    {
        // TODO: Disable the root for all items (with a custom delegate?)
        setRootIsDecorated(false);
    }

    void sync()
    {
        expandAll();
        setMinimumWidth(qMax(sizeHintForColumn(0), minimumSizeHint().width()));
    }
};

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class FindScope: protected SymbolVisitor
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{
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    TranslationUnit *_unit;
    Scope *_scope;
    unsigned _line;
    unsigned _column;
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public:
    Scope *operator()(unsigned line, unsigned column,
                      Symbol *root, TranslationUnit *unit)
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    {
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        _unit = unit;
        _scope = 0;
        _line = line;
        _column = column;
        accept(root);
        return _scope;
    }
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private:
    using SymbolVisitor::visit;
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    virtual bool preVisit(Symbol *)
    { return ! _scope; }
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    virtual bool visit(Block *block)
    { return processScope(block->members()); }
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    virtual bool visit(Function *function)
    { return processScope(function->members()); }
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    bool processScope(Scope *scope)
    {
        if (_scope || ! scope)
            return false;
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        for (unsigned i = 0; i < scope->symbolCount(); ++i) {
            accept(scope->symbolAt(i));
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            if (_scope)
                return false;
        }
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        unsigned startOffset = scope->owner()->startOffset();
        unsigned endOffset = scope->owner()->endOffset();
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        unsigned startLine, startColumn;
        unsigned endLine, endColumn;
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        _unit->getPosition(startOffset, &startLine, &startColumn);
        _unit->getPosition(endOffset, &endLine, &endColumn);
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        if (_line > startLine || (_line == startLine && _column >= startColumn)) {
            if (_line < endLine || (_line == endLine && _column < endColumn)) {
                _scope = scope;
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            }
        }
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        return false;
    }
};

class FindUses: protected ASTVisitor
{
    Scope *_functionScope;
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    FindScope findScope;

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public:
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    FindUses(Control *control)
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        : ASTVisitor(control)
    { }

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    // local and external uses.
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    SemanticInfo::LocalUseMap localUses;
    SemanticInfo::ExternalUseMap externalUses;
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    void operator()(FunctionDefinitionAST *ast)
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    {
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        localUses.clear();
        externalUses.clear();

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        if (ast && ast->symbol) {
            _functionScope = ast->symbol->members();
            accept(ast);
        }
    }

protected:
    using ASTVisitor::visit;

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    bool findMember(Scope *scope, NameAST *ast, unsigned line, unsigned column)
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    {
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        if (! (ast && ast->name))
            return false;

        Identifier *id = ast->name->identifier();
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        if (scope) {
            for (Symbol *member = scope->lookat(id); member; member = member->next()) {
                if (member->identifier() != id)
                    continue;
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                else if (member->line() < line || (member->line() == line && member->column() <= column)) {
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                    localUses[member].append(SemanticInfo::Use(line, column, id->size()));
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                    return true;
                }
            }
        }

        return false;
    }

    virtual bool visit(SimpleNameAST *ast)
    {
        unsigned line, column;
        getTokenStartPosition(ast->firstToken(), &line, &column);

        Scope *scope = findScope(line, column,
                                 _functionScope->owner(),
                                 translationUnit());

        while (scope) {
            if (scope->isFunctionScope()) {
                Function *fun = scope->owner()->asFunction();
                if (findMember(fun->members(), ast, line, column))
                    return false;
                else if (findMember(fun->arguments(), ast, line, column))
                    return false;
            } else if (scope->isBlockScope()) {
                if (findMember(scope, ast, line, column))
                    return false;
            } else {
                break;
            }

            scope = scope->enclosingScope();
        }

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        Identifier *id = identifier(ast->identifier_token);
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        externalUses[id].append(SemanticInfo::Use(line, column, id->size()));
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        return false;
    }

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    virtual bool visit(TemplateIdAST *ast)
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    {
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        unsigned line, column;
        getTokenStartPosition(ast->firstToken(), &line, &column);

        Scope *scope = findScope(line, column,
                                 _functionScope->owner(),
                                 translationUnit());

        while (scope) {
            if (scope->isFunctionScope()) {
                Function *fun = scope->owner()->asFunction();
                if (findMember(fun->members(), ast, line, column))
                    return false;
                else if (findMember(fun->arguments(), ast, line, column))
                    return false;
            } else if (scope->isBlockScope()) {
                if (findMember(scope, ast, line, column))
                    return false;
            } else {
                break;
            }

            scope = scope->enclosingScope();
        }

        Identifier *id = identifier(ast->identifier_token);
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        externalUses[id].append(SemanticInfo::Use(line, column, id->size()));
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        for (TemplateArgumentListAST *arg = ast->template_arguments; arg; arg = arg->next)
            accept(arg);

        return false;
    }

    virtual bool visit(QualifiedNameAST *ast)
    {
        if (! ast->global_scope_token) {
            if (ast->nested_name_specifier) {
                accept(ast->nested_name_specifier->class_or_namespace_name);

                for (NestedNameSpecifierAST *it = ast->nested_name_specifier->next; it; it = it->next) {
                    if (NameAST *class_or_namespace_name = it->class_or_namespace_name) {
                        if (TemplateIdAST *template_id = class_or_namespace_name->asTemplateId()) {
                            for (TemplateArgumentListAST *arg = template_id->template_arguments; arg; arg = arg->next)
                                accept(arg);
                        }
                    }
                }
            }

            accept(ast->unqualified_name);
        }

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        return false;
    }

    virtual bool visit(PostfixExpressionAST *ast)
    {
        accept(ast->base_expression);
        for (PostfixAST *it = ast->postfix_expressions; it; it = it->next) {
            if (it->asMemberAccess() != 0)
                continue; // skip members
            accept(it);
        }
        return false;
    }

    virtual bool visit(ElaboratedTypeSpecifierAST *)
    {
        // ### template args
        return false;
    }

    virtual bool visit(ClassSpecifierAST *)
    {
        // ### template args
        return false;
    }

    virtual bool visit(EnumSpecifierAST *)
    {
        // ### template args
        return false;
    }

    virtual bool visit(UsingDirectiveAST *)
    {
        return false;
    }

    virtual bool visit(UsingAST *ast)
    {
        accept(ast->name);
        return false;
    }
};


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class FunctionDefinitionUnderCursor: protected ASTVisitor
{
    unsigned _line;
    unsigned _column;
    FunctionDefinitionAST *_functionDefinition;

public:
    FunctionDefinitionUnderCursor(Control *control)
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        : ASTVisitor(control),
          _line(0), _column(0)
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    { }

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    FunctionDefinitionAST *operator()(AST *ast, unsigned line, unsigned column)
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    {
        _functionDefinition = 0;
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        _line = line;
        _column = column;
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        accept(ast);
        return _functionDefinition;
    }

protected:
    virtual bool preVisit(AST *ast)
    {
        if (_functionDefinition)
            return false;

        else if (FunctionDefinitionAST *def = ast->asFunctionDefinition()) {
            unsigned startLine, startColumn;
            unsigned endLine, endColumn;
            getTokenStartPosition(def->firstToken(), &startLine, &startColumn);
            getTokenEndPosition(def->lastToken() - 1, &endLine, &endColumn);

            if (_line > startLine || (_line == startLine && _column >= startColumn)) {
                if (_line < endLine || (_line == endLine && _column < endColumn)) {
                    _functionDefinition = def;
                    return false;
                }
            }
        }

        return true;
    }

};

class ProcessDeclarators: protected ASTVisitor
{
    QList<DeclaratorIdAST *> _declarators;
    bool _visitFunctionDeclarator;

public:
    ProcessDeclarators(Control *control)
            : ASTVisitor(control), _visitFunctionDeclarator(true)
    { }

    QList<DeclaratorIdAST *> operator()(FunctionDefinitionAST *ast)
    {
        _declarators.clear();

        if (ast) {
            if (ast->declarator) {
                _visitFunctionDeclarator = true;
                accept(ast->declarator->postfix_declarators);
            }

            _visitFunctionDeclarator = false;
            accept(ast->function_body);
        }

        return _declarators;
    }

protected:
    using ASTVisitor::visit;

    virtual bool visit(FunctionDeclaratorAST *)
    { return _visitFunctionDeclarator; }

    virtual bool visit(DeclaratorIdAST *ast)
    {
        _declarators.append(ast);
        return true;
    }
};

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class FindFunctionDefinitions: protected SymbolVisitor
{
    Name *_declarationName;
    QList<Function *> *_functions;

public:
    FindFunctionDefinitions()
        : _declarationName(0),
          _functions(0)
    { }

    void operator()(Name *declarationName, Scope *globals,
                    QList<Function *> *functions)
    {
        _declarationName = declarationName;
        _functions = functions;

        for (unsigned i = 0; i < globals->symbolCount(); ++i) {
            accept(globals->symbolAt(i));
        }
    }

protected:
    using SymbolVisitor::visit;

    virtual bool visit(Function *function)
    {
        Name *name = function->name();
        if (QualifiedNameId *q = name->asQualifiedNameId())
            name = q->unqualifiedNameId();

        if (_declarationName->isEqualTo(name))
            _functions->append(function);

        return false;
    }
};

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} // end of anonymous namespace

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static QualifiedNameId *qualifiedNameIdForSymbol(Symbol *s, const LookupContext &context)
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{
    Name *symbolName = s->name();
    if (! symbolName)
        return 0; // nothing to do.

    QVector<Name *> names;

    for (Scope *scope = s->scope(); scope; scope = scope->enclosingScope()) {
        if (scope->isClassScope() || scope->isNamespaceScope()) {
            if (scope->owner() && scope->owner()->name()) {
                Name *ownerName = scope->owner()->name();
                if (QualifiedNameId *q = ownerName->asQualifiedNameId()) {
                    for (unsigned i = 0; i < q->nameCount(); ++i) {
                        names.prepend(q->nameAt(i));
                    }
                } else {
                    names.prepend(ownerName);
                }
            }
        }
    }

    if (QualifiedNameId *q = symbolName->asQualifiedNameId()) {
        for (unsigned i = 0; i < q->nameCount(); ++i) {
            names.append(q->nameAt(i));
        }
    } else {
        names.append(symbolName);
    }

    return context.control()->qualifiedNameId(names.constData(), names.size());
}

CPPEditorEditable::CPPEditorEditable(CPPEditor *editor)
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    : BaseTextEditorEditable(editor)
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{
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    Core::UniqueIDManager *uidm = Core::UniqueIDManager::instance();
    m_context << uidm->uniqueIdentifier(CppEditor::Constants::C_CPPEDITOR);
    m_context << uidm->uniqueIdentifier(ProjectExplorer::Constants::LANG_CXX);
    m_context << uidm->uniqueIdentifier(TextEditor::Constants::C_TEXTEDITOR);
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}

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CPPEditor::CPPEditor(QWidget *parent)
    : TextEditor::BaseTextEditor(parent)
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    , m_currentRenameSelection(-1)
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    , m_inRename(false)
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    , m_allowSkippingOfBlockEnd(false)
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{
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    qRegisterMetaType<SemanticInfo>("SemanticInfo");

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    m_revision = 0;

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    m_semanticHighlighter = new SemanticHighlighter(this);
    m_semanticHighlighter->start();

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    setParenthesesMatchingEnabled(true);
    setMarksVisible(true);
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    setCodeFoldingSupported(true);
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    setCodeFoldingVisible(true);
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    baseTextDocument()->setSyntaxHighlighter(new CppHighlighter);
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#ifdef WITH_TOKEN_MOVE_POSITION
    new QShortcut(QKeySequence::MoveToPreviousWord, this, SLOT(moveToPreviousToken()),
                  /*ambiguousMember=*/ 0, Qt::WidgetShortcut);

    new QShortcut(QKeySequence::MoveToNextWord, this, SLOT(moveToNextToken()),
                  /*ambiguousMember=*/ 0, Qt::WidgetShortcut);

    new QShortcut(QKeySequence::DeleteStartOfWord, this, SLOT(deleteStartOfToken()),
                  /*ambiguousMember=*/ 0, Qt::WidgetShortcut);

    new QShortcut(QKeySequence::DeleteEndOfWord, this, SLOT(deleteEndOfToken()),
                  /*ambiguousMember=*/ 0, Qt::WidgetShortcut);
#endif

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    m_modelManager = ExtensionSystem::PluginManager::instance()
        ->getObject<CppTools::CppModelManagerInterface>();
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    if (m_modelManager) {
        connect(m_modelManager, SIGNAL(documentUpdated(CPlusPlus::Document::Ptr)),
                this, SLOT(onDocumentUpdated(CPlusPlus::Document::Ptr)));
    }
}

CPPEditor::~CPPEditor()
{
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    m_semanticHighlighter->abort();
    m_semanticHighlighter->wait();
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}

TextEditor::BaseTextEditorEditable *CPPEditor::createEditableInterface()
{
    CPPEditorEditable *editable = new CPPEditorEditable(this);
    createToolBar(editable);
    return editable;
}

void CPPEditor::createToolBar(CPPEditorEditable *editable)
{
    m_methodCombo = new QComboBox;
    m_methodCombo->setMinimumContentsLength(22);
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    // Make the combo box prefer to expand
    QSizePolicy policy = m_methodCombo->sizePolicy();
    policy.setHorizontalPolicy(QSizePolicy::Expanding);
    m_methodCombo->setSizePolicy(policy);

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    QTreeView *methodView = new OverviewTreeView;
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    methodView->header()->hide();
    methodView->setItemsExpandable(false);
    m_methodCombo->setView(methodView);
    m_methodCombo->setMaxVisibleItems(20);

    m_overviewModel = new OverviewModel(this);
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    m_proxyModel = new QSortFilterProxyModel(this);
    m_proxyModel->setSourceModel(m_overviewModel);
    if (CppPlugin::instance()->sortedMethodOverview())
        m_proxyModel->sort(0, Qt::AscendingOrder);
    else
        m_proxyModel->sort(-1, Qt::AscendingOrder); // don't sort yet, but set column for sortedMethodOverview()
    m_proxyModel->setDynamicSortFilter(true);
    m_proxyModel->setSortCaseSensitivity(Qt::CaseInsensitive);
    m_methodCombo->setModel(m_proxyModel);

    m_methodCombo->setContextMenuPolicy(Qt::ActionsContextMenu);
    m_sortAction = new QAction(tr("Sort alphabetically"), m_methodCombo);
    m_sortAction->setCheckable(true);
    m_sortAction->setChecked(sortedMethodOverview());
    connect(m_sortAction, SIGNAL(toggled(bool)), CppPlugin::instance(), SLOT(setSortedMethodOverview(bool)));
    m_methodCombo->addAction(m_sortAction);
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    m_updateMethodBoxTimer = new QTimer(this);
    m_updateMethodBoxTimer->setSingleShot(true);
    m_updateMethodBoxTimer->setInterval(UPDATE_METHOD_BOX_INTERVAL);
    connect(m_updateMethodBoxTimer, SIGNAL(timeout()), this, SLOT(updateMethodBoxIndexNow()));

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    m_updateUsesTimer = new QTimer(this);
    m_updateUsesTimer->setSingleShot(true);
    m_updateUsesTimer->setInterval(UPDATE_USES_INTERVAL);
    connect(m_updateUsesTimer, SIGNAL(timeout()), this, SLOT(updateUsesNow()));

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    connect(m_methodCombo, SIGNAL(activated(int)), this, SLOT(jumpToMethod(int)));
    connect(this, SIGNAL(cursorPositionChanged()), this, SLOT(updateMethodBoxIndex()));
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    connect(m_methodCombo, SIGNAL(currentIndexChanged(int)), this, SLOT(updateMethodBoxToolTip()));
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    connect(document(), SIGNAL(contentsChange(int,int,int)), this, SLOT(onContentsChanged(int,int,int)));
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    connect(file(), SIGNAL(changed()), this, SLOT(updateFileName()));

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

    connect(m_semanticHighlighter, SIGNAL(changed(SemanticInfo)),
            this, SLOT(updateSemanticInfo(SemanticInfo)));

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    QToolBar *toolBar = static_cast<QToolBar*>(editable->toolBar());
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    QList<QAction*> actions = toolBar->actions();
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    QWidget *w = toolBar->widgetForAction(actions.first());
    static_cast<QHBoxLayout*>(w->layout())->insertWidget(0, m_methodCombo, 1);
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}

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void CPPEditor::inAllRenameSelections(EditOperation operation,
                                      const QTextEdit::ExtraSelection &currentRenameSelection,
                                      QTextCursor cursor,
                                      const QString &text)
{
    m_inRename = true;
    cursor.beginEditBlock();

    const int offset = cursor.position() - currentRenameSelection.cursor.anchor();

    for (int i = 0; i < m_renameSelections.size(); ++i) {
        QTextEdit::ExtraSelection &s = m_renameSelections[i];
        int pos = s.cursor.anchor();
        int endPos = s.cursor.position();
        s.cursor.setPosition(s.cursor.anchor() + offset);

        switch (operation) {
        case DeletePreviousChar:
            s.cursor.deletePreviousChar();
            --endPos;
            break;
        case DeleteChar:
            s.cursor.deleteChar();
            --endPos;
            break;
        case InsertText:
            s.cursor.insertText(text);
            endPos += text.length();
            break;
        }

        s.cursor.setPosition(pos);
        s.cursor.setPosition(endPos, QTextCursor::KeepAnchor);
    }

    cursor.endEditBlock();
    m_inRename = false;

    setExtraSelections(CodeSemanticsSelection, m_renameSelections);
    setTextCursor(cursor);
}

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void CPPEditor::abortRename()
{
    m_currentRenameSelection = -1;
    m_renameSelections.clear();
    setExtraSelections(CodeSemanticsSelection, m_renameSelections);
}

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int CPPEditor::previousBlockState(QTextBlock block) const
{
    block = block.previous();
    if (block.isValid()) {
        int state = block.userState();

        if (state != -1)
            return state;
    }
    return 0;
}

QTextCursor CPPEditor::moveToPreviousToken(QTextCursor::MoveMode mode) const
{
    SimpleLexer tokenize;
    QTextCursor c(textCursor());
    QTextBlock block = c.block();
    int column = c.columnNumber();

    for (; block.isValid(); block = block.previous()) {
        const QString textBlock = block.text();
        QList<SimpleToken> tokens = tokenize(textBlock, previousBlockState(block));

        if (! tokens.isEmpty()) {
            tokens.prepend(SimpleToken());

            for (int index = tokens.size() - 1; index != -1; --index) {
                const SimpleToken &tk = tokens.at(index);
                if (tk.position() < column) {
                    c.setPosition(block.position() + tk.position(), mode);
                    return c;
                }
            }
        }

        column = INT_MAX;
    }

    c.movePosition(QTextCursor::Start, mode);
    return c;
}

QTextCursor CPPEditor::moveToNextToken(QTextCursor::MoveMode mode) const
{
    SimpleLexer tokenize;
    QTextCursor c(textCursor());
    QTextBlock block = c.block();
    int column = c.columnNumber();

    for (; block.isValid(); block = block.next()) {
        const QString textBlock = block.text();
        QList<SimpleToken> tokens = tokenize(textBlock, previousBlockState(block));

        if (! tokens.isEmpty()) {
            for (int index = 0; index < tokens.size(); ++index) {
                const SimpleToken &tk = tokens.at(index);
                if (tk.position() > column) {
                    c.setPosition(block.position() + tk.position(), mode);
                    return c;
                }
            }
        }

        column = -1;
    }

    c.movePosition(QTextCursor::End, mode);
    return c;
}

void CPPEditor::moveToPreviousToken()
{
    setTextCursor(moveToPreviousToken(QTextCursor::MoveAnchor));
}

void CPPEditor::moveToNextToken()
{
    setTextCursor(moveToNextToken(QTextCursor::MoveAnchor));
}

void CPPEditor::deleteStartOfToken()
{
    QTextCursor c = moveToPreviousToken(QTextCursor::KeepAnchor);
    c.removeSelectedText();
    setTextCursor(c);
}

void CPPEditor::deleteEndOfToken()
{
    QTextCursor c = moveToNextToken(QTextCursor::KeepAnchor);
    c.removeSelectedText();
    setTextCursor(c);
}

void CPPEditor::onDocumentUpdated(Document::Ptr doc)
{
    if (doc->fileName() != file()->fileName())
        return;

    m_overviewModel->rebuild(doc);
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    OverviewTreeView *treeView = static_cast<OverviewTreeView *>(m_methodCombo->view());
    treeView->sync();
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    updateMethodBoxIndexNow();
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}

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void CPPEditor::reformatDocument()
{
    using namespace CPlusPlus;

    QByteArray source = toPlainText().toUtf8();

    Control control;
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    StringLiteral *fileId = control.findOrInsertStringLiteral("<file>");
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    TranslationUnit unit(&control, fileId);
    unit.setQtMocRunEnabled(true);
    unit.setSource(source.constData(), source.length());
    unit.parse();
    if (! unit.ast())
        return;

    std::ostringstream s;

    TranslationUnitAST *ast = unit.ast()->asTranslationUnit();
    PrettyPrinter pp(&control, s);
    pp(ast, source);

    const std::string str = s.str();
    QTextCursor c = textCursor();
    c.setPosition(0);
    c.movePosition(QTextCursor::End, QTextCursor::KeepAnchor);
    c.insertText(QString::fromUtf8(str.c_str(), str.length()));
}

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void CPPEditor::findReferences()
{
    QTextCursor tc = textCursor();
    m_currentRenameSelection = -1;

    int line, col;
    convertPosition(tc.position(), &line, &col);
    ++col;

    tc.movePosition(QTextCursor::EndOfWord);

    ExpressionUnderCursor expressionUnderCursor;
    const QString code = expressionUnderCursor(tc);
    qDebug() << "code:" << code;

    Snapshot snapshot = m_modelManager->snapshot();
    Document::Ptr doc = snapshot.value(file()->fileName());

    TypeOfExpression typeOfExpression;
    typeOfExpression.setSnapshot(snapshot);

    Symbol *lastVisibleSymbol = doc->findSymbolAt(line, col);

    const QList<TypeOfExpression::Result> results = typeOfExpression(code, doc,
                                                                     lastVisibleSymbol,
                                                                     TypeOfExpression::Preprocess);

    if (! results.isEmpty()) {
        TypeOfExpression::Result result = results.first();
        Symbol *symbol = result.second;
        qDebug() << "result:" << symbol->fileName() << symbol->line() << symbol->column();
        m_modelManager->findReferences(symbol);
    }


#if 0
        LookupContext context(
        Overview oo;
        qDebug() << "==============> filename:" << symbol->fileName()
                << "name:" << oo(symbol->name());
        m_modelManager->findReferences(symbol);
    }
#endif
}

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void CPPEditor::renameSymbolUnderCursor()
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{
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    updateSemanticInfo(m_semanticHighlighter->semanticInfo(currentSource()));
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    QTextCursor c = textCursor();
    m_currentRenameSelection = -1;

    m_renameSelections = extraSelections(CodeSemanticsSelection);
    for (int i = 0; i < m_renameSelections.size(); ++i) {
        QTextEdit::ExtraSelection s = m_renameSelections.at(i);
        if (c.position() >= s.cursor.anchor()
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                && c.position() <= s.cursor.position()) {
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            m_currentRenameSelection = i;
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            m_renameSelections[i].format = m_occurrenceRenameFormat;
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            setExtraSelections(CodeSemanticsSelection, m_renameSelections);
            break;
        }
    }
}

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

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    ++m_revision;

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    if (m_currentRenameSelection == -1)
        return;

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    if (!m_inRename)
        abortRename();

    if (charsRemoved > 0)
        updateUses();
}

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void CPPEditor::updateFileName()
{ }

void CPPEditor::jumpToMethod(int)
{
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    QModelIndex index = m_proxyModel->mapToSource(m_methodCombo->view()->currentIndex());
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    Symbol *symbol = m_overviewModel->symbolFromIndex(index);
    if (! symbol)
        return;

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    openCppEditorAt(linkToSymbol(symbol));
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}

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void CPPEditor::setSortedMethodOverview(bool sort)
{
    if (sort != sortedMethodOverview()) {
        if (sort)
            m_proxyModel->sort(0, Qt::AscendingOrder);
        else
            m_proxyModel->sort(-1, Qt::AscendingOrder);
        bool block = m_sortAction->blockSignals(true);
        m_sortAction->setChecked(m_proxyModel->sortColumn() == 0);
        m_sortAction->blockSignals(block);
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        updateMethodBoxIndexNow();
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    }
}

bool CPPEditor::sortedMethodOverview() const
{
    return (m_proxyModel->sortColumn() == 0);
}

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void CPPEditor::updateMethodBoxIndex()
{
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    m_updateMethodBoxTimer->start(UPDATE_METHOD_BOX_INTERVAL);
}

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void CPPEditor::highlightUses(const QList<SemanticInfo::Use> &uses,
                              QList<QTextEdit::ExtraSelection> *selections)
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{
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    bool isUnused = false;
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    if (uses.size() == 1) {
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        isUnused = true;
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        return; // ###
    }
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    foreach (const SemanticInfo::Use &use, uses) {
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        QTextEdit::ExtraSelection sel;
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        if (isUnused)
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            sel.format = m_occurrencesUnusedFormat;
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        else
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            sel.format = m_occurrencesFormat;
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        const int anchor = document()->findBlockByNumber(use.line - 1).position() + use.column - 1;
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        const int position = anchor + use.length;
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        sel.cursor = QTextCursor(document());
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        sel.cursor.setPosition(anchor);
        sel.cursor.setPosition(position, QTextCursor::KeepAnchor);
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        selections->append(sel);
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    }
}

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void CPPEditor::updateMethodBoxIndexNow()
{
    m_updateMethodBoxTimer->stop();

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    int line = 0, column = 0;
    convertPosition(position(), &line, &column);

    QModelIndex lastIndex;

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    const int rc = m_overviewModel->rowCount();
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    for (int row = 0; row < rc; ++row) {
        const QModelIndex index = m_overviewModel->index(row, 0, QModelIndex());
        Symbol *symbol = m_overviewModel->symbolFromIndex(index);
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        if (symbol && symbol->line() > unsigned(line))
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            break;
        lastIndex = index;
    }

    if (lastIndex.isValid()) {
        bool blocked = m_methodCombo->blockSignals(true);
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        m_methodCombo->setCurrentIndex(m_proxyModel->mapFromSource(lastIndex).row());
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        updateMethodBoxToolTip();
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        (void) m_methodCombo->blockSignals(blocked);
    }
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}

void CPPEditor::updateMethodBoxToolTip()
{
    m_methodCombo->setToolTip(m_methodCombo->currentText());
}

void CPPEditor::updateUses()
{
    m_updateUsesTimer->start(UPDATE_USES_INTERVAL);
}

void CPPEditor::updateUsesNow()
{
    m_updateUsesTimer->stop();

    if (m_currentRenameSelection != -1)
        return;

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    semanticRehighlight();
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}

static bool isCompatible(Name *name, Name *otherName)
{
    if (NameId *nameId = name->asNameId()) {
        if (TemplateNameId *otherTemplId = otherName->asTemplateNameId())
            return nameId->identifier()->isEqualTo(otherTemplId->identifier());
    } else if (TemplateNameId *templId = name->asTemplateNameId()) {
        if (NameId *otherNameId = otherName->asNameId())
            return templId->identifier()->isEqualTo(otherNameId->identifier());
    }

    return name->isEqualTo(otherName);
}

static bool isCompatible(Function *definition, Symbol *declaration, QualifiedNameId *declarationName)
{
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    Function *declTy = declaration->type()->asFunctionType();
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    if (! declTy)
        return false;

    Name *definitionName = definition->name();
    if (QualifiedNameId *q = definitionName->asQualifiedNameId()) {
        if (! isCompatible(q->unqualifiedNameId(), declaration->name()))
            return false;
        else if (q->nameCount() > declarationName->nameCount())
            return false;
        else if (declTy->argumentCount() != definition->argumentCount())
            return false;
        else if (declTy->isConst() != definition->isConst())
            return false;
        else if (declTy->isVolatile() != definition->isVolatile())
            return false;

        for (unsigned i = 0; i < definition->argumentCount(); ++i) {
            Symbol *arg = definition->argumentAt(i);
            Symbol *otherArg = declTy->argumentAt(i);
            if (! arg->type().isEqualTo(otherArg->type()))
                return false;
        }

        for (unsigned i = 0; i != q->nameCount(); ++i) {
            Name *n = q->nameAt(q->nameCount() - i - 1);
            Name *m = declarationName->nameAt(declarationName->nameCount() - i - 1);
            if (! isCompatible(n, m))
                return false;
        }
        return true;
    } else {
        // ### TODO: implement isCompatible for unqualified name ids.
    }
    return false;
}

void CPPEditor::switchDeclarationDefinition()
{
    int line = 0, column = 0;
    convertPosition(position(), &line, &column);

    if (!m_modelManager)
        return;

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    const Snapshot snapshot = m_modelManager->snapshot();

    Document::Ptr doc = snapshot.value(file()->fileName());
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    if (!doc)
        return;
    Symbol *lastSymbol = doc->findSymbolAt(line, column);
    if (!lastSymbol || !lastSymbol->scope())
        return;

    Function *f = lastSymbol->asFunction();
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    if (!f) {
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        Scope *fs = lastSymbol->scope();
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        if (!fs->isFunctionScope())
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            fs = fs->enclosingFunctionScope();
        if (fs)
            f = fs->owner()->asFunction();
    }

    if (f) {
        TypeOfExpression typeOfExpression;
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        typeOfExpression.setSnapshot(m_modelManager->snapshot());
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        QList<TypeOfExpression::Result> resolvedSymbols = typeOfExpression(QString(), doc, lastSymbol);
        const LookupContext &context = typeOfExpression.lookupContext();

        QualifiedNameId *q = qualifiedNameIdForSymbol(f, context);
        QList<Symbol *> symbols = context.resolve(q);

        Symbol *declaration = 0;
        foreach (declaration, symbols) {
            if (isCompatible(f, declaration, q))
                break;
        }

        if (! declaration && ! symbols.isEmpty())
            declaration = symbols.first();

        if (declaration)
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            openCppEditorAt(linkToSymbol(declaration));
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    } else if (lastSymbol->type()->isFunctionType()) {
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        if (Symbol *def = findDefinition(lastSymbol))
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            openCppEditorAt(linkToSymbol(def));
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    }
}

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CPPEditor::Link CPPEditor::findLinkAt(const QTextCursor &cursor,
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                                      bool resolveTarget)
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{
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    Link link;
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    if (!m_modelManager)
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        return link;
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    const Snapshot snapshot = m_modelManager->snapshot();
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    int line = 0, column = 0;
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    convertPosition(cursor.position(), &line, &column);
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    Document::Ptr doc = snapshot.value(file()->fileName());
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    if (!doc)
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        return link;
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    QTextCursor tc = cursor;
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    // Make sure we're not at the start of a word
    {
        const QChar c = characterAt(tc.position());
        if (c.isLetter() || c == QLatin1Char('_'))
            tc.movePosition(QTextCursor::Right);
    }

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    static TokenUnderCursor tokenUnderCursor;
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    QTextBlock block;
    const SimpleToken tk = tokenUnderCursor(tc, &block);

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    // Handle include directives
    if (tk.is(T_STRING_LITERAL) || tk.is(T_ANGLE_STRING_LITERAL)) {
        const unsigned lineno = cursor.blockNumber() + 1;
        foreach (const Document::Include &incl, doc->includes()) {
            if (incl.line() == lineno && incl.resolved()) {
                link.fileName = incl.fileName();
                link.pos = cursor.block().position() + tk.position() + 1;
                link.length = tk.length() - 2;
                return link;
            }
        }
    }

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    if (tk.isNot(T_IDENTIFIER))
        return link;

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    // Find the last symbol up to the cursor position
    Symbol *lastSymbol = doc->findSymbolAt(line, column);
    if (!lastSymbol)
        return link;

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    const int nameStart = tk.position();
    const int nameLength = tk.length();
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    const int endOfName = block.position() + nameStart + nameLength;
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    const QString name = block.text().mid(nameStart, nameLength);
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    tc.setPosition(endOfName);
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    // Evaluate the type of the expression under the cursor
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    ExpressionUnderCursor expressionUnderCursor;
    const QString expression = expressionUnderCursor(tc);
    TypeOfExpression typeOfExpression;
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    typeOfExpression.setSnapshot(snapshot);
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    QList<TypeOfExpression::Result> resolvedSymbols =
            typeOfExpression(expression, doc, lastSymbol);

    if (!resolvedSymbols.isEmpty()) {
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        TypeOfExpression::Result result = resolvedSymbols.first();

        if (result.first->isForwardClassDeclarationType()) {
            while (! resolvedSymbols.isEmpty()) {
                TypeOfExpression::Result r = resolvedSymbols.takeFirst();

                if (! r.first->isForwardClassDeclarationType()) {
                    result = r;
                    break;
                }
            }
        }

        if (Symbol *symbol = result.second) {
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            Symbol *def = 0;
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            if (resolveTarget && !lastSymbol->isFunction())
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                def = findDefinition(symbol);

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            link = linkToSymbol(def ? def : symbol);
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            link.pos = block.position() + nameStart;
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            link.length = nameLength;
            return link;
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        // This would jump to the type of a name
#if 0
        } else if (NamedType *namedType = firstType->asNamedType()) {
            QList<Symbol *> candidates = context.resolve(namedType->name());
            if (!candidates.isEmpty()) {
                Symbol *s = candidates.takeFirst();
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                openCppEditorAt(s->fileName(), s->line(), s->column());
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            }
#endif
        }
    } else {
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