cppquickfixes.cpp 58.1 KB
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/**************************************************************************
**
** This file is part of Qt Creator
**
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** Copyright (c) 2011 Nokia Corporation and/or its subsidiary(-ies).
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**
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** Contact: Nokia Corporation (info@qt.nokia.com)
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**
**
** GNU Lesser General Public License Usage
**
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** 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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** In addition, as a special exception, Nokia gives you certain additional
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** rights. These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
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** Other Usage
**
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
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** If you have questions regarding the use of this file, please contact
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** Nokia at info@qt.nokia.com.
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**
**************************************************************************/

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#include "cppcompleteswitch.h"
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#include "cppeditor.h"
#include "cppquickfix.h"
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#include "cppinsertdecldef.h"
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#include "cppinsertqtpropertymembers.h"
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#include "cppquickfixassistant.h"
#include "cppcompleteswitch.h"
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#include <ASTVisitor.h>
#include <AST.h>
#include <ASTMatcher.h>
#include <ASTPatternBuilder.h>
#include <CoreTypes.h>
#include <Literals.h>
#include <Name.h>
#include <Names.h>
#include <Symbol.h>
#include <Symbols.h>
#include <Token.h>
#include <TranslationUnit.h>
#include <Type.h>

#include <cplusplus/DependencyTable.h>
#include <cplusplus/Overview.h>
#include <cplusplus/TypeOfExpression.h>
#include <cplusplus/CppRewriter.h>
#include <cpptools/cpptoolsconstants.h>
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#include <cpptools/cpprefactoringchanges.h>
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#include <cpptools/insertionpointlocator.h>
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#include <extensionsystem/iplugin.h>

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#include <QtCore/QFileInfo>
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#include <QtGui/QApplication>
#include <QtGui/QTextBlock>
#include <QtGui/QTextCursor>

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

namespace {

/*
    Rewrite
    a op b -> !(a invop b)
    (a op b) -> !(a invop b)
    !(a op b) -> (a invob b)
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    Activates on: <= < > >= == !=
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*/
class UseInverseOp: public CppQuickFixFactory
{
public:
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    virtual QList<CppQuickFixOperation::Ptr> match(const QSharedPointer<const CppQuickFixAssistInterface> &interface)
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    {
        QList<CppQuickFixOperation::Ptr> result;
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        const CppRefactoringFile &file = interface->currentFile();
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        const QList<AST *> &path = interface->path();
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        int index = path.size() - 1;
        BinaryExpressionAST *binary = path.at(index)->asBinaryExpression();
        if (! binary)
            return result;
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        if (! interface->isCursorOn(binary->binary_op_token))
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            return result;

        Kind invertToken;
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        switch (file.tokenAt(binary->binary_op_token).kind()) {
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        case T_LESS_EQUAL:
            invertToken = T_GREATER;
            break;
        case T_LESS:
            invertToken = T_GREATER_EQUAL;
            break;
        case T_GREATER:
            invertToken = T_LESS_EQUAL;
            break;
        case T_GREATER_EQUAL:
            invertToken = T_LESS;
            break;
        case T_EQUAL_EQUAL:
            invertToken = T_EXCLAIM_EQUAL;
            break;
        case T_EXCLAIM_EQUAL:
            invertToken = T_EQUAL_EQUAL;
            break;
        default:
            return result;
        }

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        result.append(CppQuickFixOperation::Ptr(new Operation(interface, index, binary, invertToken)));
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        return result;
    }

private:
    class Operation: public CppQuickFixOperation
    {
        BinaryExpressionAST *binary;
        NestedExpressionAST *nested;
        UnaryExpressionAST *negation;

        QString replacement;

    public:
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        Operation(const QSharedPointer<const CppQuickFixAssistInterface> &interface,
            int priority, BinaryExpressionAST *binary, Kind invertToken)
            : CppQuickFixOperation(interface, priority)
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            , binary(binary), nested(0), negation(0)
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        {
            Token tok;
            tok.f.kind = invertToken;
            replacement = QLatin1String(tok.spell());

            // check for enclosing nested expression
            if (priority - 1 >= 0)
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                nested = interface->path()[priority - 1]->asNestedExpression();
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            // check for ! before parentheses
            if (nested && priority - 2 >= 0) {
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                negation = interface->path()[priority - 2]->asUnaryExpression();
                if (negation && ! interface->currentFile().tokenAt(negation->unary_op_token).is(T_EXCLAIM))
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                    negation = 0;
            }
        }

        virtual QString description() const
        {
            return QApplication::translate("CppTools::QuickFix", "Rewrite Using %1").arg(replacement);
        }

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        virtual void performChanges(CppRefactoringFile *currentFile, CppRefactoringChanges *)
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        {
            ChangeSet changes;
            if (negation) {
                // can't remove parentheses since that might break precedence
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                changes.remove(currentFile->range(negation->unary_op_token));
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            } else if (nested) {
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                changes.insert(currentFile->startOf(nested), "!");
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            } else {
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                changes.insert(currentFile->startOf(binary), "!(");
                changes.insert(currentFile->endOf(binary), ")");
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            }
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            changes.replace(currentFile->range(binary->binary_op_token), replacement);
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            currentFile->change(changes);
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        }
    };
};

/*
    Rewrite
    a op b

    As
    b flipop a
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    Activates on: <= < > >= == != && ||
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*/
class FlipBinaryOp: public CppQuickFixFactory
{
public:
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    virtual QList<QuickFixOperation::Ptr> match(const QSharedPointer<const CppQuickFixAssistInterface> &interface)
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    {
        QList<QuickFixOperation::Ptr> result;
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        const QList<AST *> &path = interface->path();
        const CppRefactoringFile &file = interface->currentFile();
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        int index = path.size() - 1;
        BinaryExpressionAST *binary = path.at(index)->asBinaryExpression();
        if (! binary)
            return result;
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        if (! interface->isCursorOn(binary->binary_op_token))
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            return result;

        Kind flipToken;
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        switch (file.tokenAt(binary->binary_op_token).kind()) {
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        case T_LESS_EQUAL:
            flipToken = T_GREATER_EQUAL;
            break;
        case T_LESS:
            flipToken = T_GREATER;
            break;
        case T_GREATER:
            flipToken = T_LESS;
            break;
        case T_GREATER_EQUAL:
            flipToken = T_LESS_EQUAL;
            break;
        case T_EQUAL_EQUAL:
        case T_EXCLAIM_EQUAL:
        case T_AMPER_AMPER:
        case T_PIPE_PIPE:
            flipToken = T_EOF_SYMBOL;
            break;
        default:
            return result;
        }

        QString replacement;
        if (flipToken != T_EOF_SYMBOL) {
            Token tok;
            tok.f.kind = flipToken;
            replacement = QLatin1String(tok.spell());
        }

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        result.append(QuickFixOperation::Ptr(new Operation(interface, index, binary, replacement)));
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        return result;
    }

private:
    class Operation: public CppQuickFixOperation
    {
    public:
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        Operation(const QSharedPointer<const CppQuickFixAssistInterface> &interface,
                  int priority, BinaryExpressionAST *binary, QString replacement)
            : CppQuickFixOperation(interface)
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            , binary(binary)
            , replacement(replacement)
        {
            setPriority(priority);
        }

        virtual QString description() const
        {
            if (replacement.isEmpty())
                return QApplication::translate("CppTools::QuickFix", "Swap Operands");
            else
                return QApplication::translate("CppTools::QuickFix", "Rewrite Using %1").arg(replacement);
        }

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        virtual void performChanges(CppRefactoringFile *currentFile, CppRefactoringChanges *)
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        {
            ChangeSet changes;

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            changes.flip(currentFile->range(binary->left_expression), currentFile->range(binary->right_expression));
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            if (! replacement.isEmpty())
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                changes.replace(currentFile->range(binary->binary_op_token), replacement);
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            currentFile->change(changes);
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        }

    private:
        BinaryExpressionAST *binary;
        QString replacement;
    };
};

/*
    Rewrite
    !a && !b

    As
    !(a || b)
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    Activates on: &&
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*/
class RewriteLogicalAndOp: public CppQuickFixFactory
{
public:
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    virtual QList<QuickFixOperation::Ptr> match(const QSharedPointer<const CppQuickFixAssistInterface> &interface)
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    {
        QList<QuickFixOperation::Ptr> result;
        BinaryExpressionAST *expression = 0;
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        const QList<AST *> &path = interface->path();
        const CppRefactoringFile &file = interface->currentFile();
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        int index = path.size() - 1;
        for (; index != -1; --index) {
            expression = path.at(index)->asBinaryExpression();
            if (expression)
                break;
        }

        if (! expression)
            return result;

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        if (! interface->isCursorOn(expression->binary_op_token))
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            return result;

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        QSharedPointer<Operation> op(new Operation(interface));
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        if (expression->match(op->pattern, &matcher) &&
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                file.tokenAt(op->pattern->binary_op_token).is(T_AMPER_AMPER) &&
                file.tokenAt(op->left->unary_op_token).is(T_EXCLAIM) &&
                file.tokenAt(op->right->unary_op_token).is(T_EXCLAIM)) {
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            op->setDescription(QApplication::translate("CppTools::QuickFix", "Rewrite Condition Using ||"));
            op->setPriority(index);
            result.append(op);
        }

        return result;
    }

private:
    class Operation: public CppQuickFixOperation
    {
    public:
        QSharedPointer<ASTPatternBuilder> mk;
        UnaryExpressionAST *left;
        UnaryExpressionAST *right;
        BinaryExpressionAST *pattern;

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        Operation(const QSharedPointer<const CppQuickFixAssistInterface> &interface)
            : CppQuickFixOperation(interface)
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            , mk(new ASTPatternBuilder)
        {
            left = mk->UnaryExpression();
            right = mk->UnaryExpression();
            pattern = mk->BinaryExpression(left, right);
        }

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        virtual void performChanges(CppRefactoringFile *currentFile, CppRefactoringChanges *)
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        {
            ChangeSet changes;
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            changes.replace(currentFile->range(pattern->binary_op_token), QLatin1String("||"));
            changes.remove(currentFile->range(left->unary_op_token));
            changes.remove(currentFile->range(right->unary_op_token));
            const int start = currentFile->startOf(pattern);
            const int end = currentFile->endOf(pattern);
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            changes.insert(start, QLatin1String("!("));
            changes.insert(end, QLatin1String(")"));

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            currentFile->change(changes);
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            currentFile->indent(currentFile->range(pattern));
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        }
    };

private:
    ASTMatcher matcher;
};

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/*
    Rewrite
    int *a, b;

    As
    int *a;
    int b;
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    Activates on: the type or the variable names.
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*/
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class SplitSimpleDeclarationOp: public CppQuickFixFactory
{
    static bool checkDeclaration(SimpleDeclarationAST *declaration)
    {
        if (! declaration->semicolon_token)
            return false;

        if (! declaration->decl_specifier_list)
            return false;

        for (SpecifierListAST *it = declaration->decl_specifier_list; it; it = it->next) {
            SpecifierAST *specifier = it->value;

            if (specifier->asEnumSpecifier() != 0)
                return false;

            else if (specifier->asClassSpecifier() != 0)
                return false;
        }

        if (! declaration->declarator_list)
            return false;

        else if (! declaration->declarator_list->next)
            return false;

        return true;
    }

public:
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    virtual QList<CppQuickFixOperation::Ptr> match(const QSharedPointer<const CppQuickFixAssistInterface> &interface)
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    {
        QList<CppQuickFixOperation::Ptr> result;
        CoreDeclaratorAST *core_declarator = 0;
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        const QList<AST *> &path = interface->path();
        const CppRefactoringFile &file = interface->currentFile();
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        for (int index = path.size() - 1; index != -1; --index) {
            AST *node = path.at(index);

            if (CoreDeclaratorAST *coreDecl = node->asCoreDeclarator())
                core_declarator = coreDecl;

            else if (SimpleDeclarationAST *simpleDecl = node->asSimpleDeclaration()) {
                if (checkDeclaration(simpleDecl)) {
                    SimpleDeclarationAST *declaration = simpleDecl;

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                    const int cursorPosition = file.cursor().selectionStart();
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                    const int startOfDeclSpecifier = file.startOf(declaration->decl_specifier_list->firstToken());
                    const int endOfDeclSpecifier = file.endOf(declaration->decl_specifier_list->lastToken() - 1);
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                    if (cursorPosition >= startOfDeclSpecifier && cursorPosition <= endOfDeclSpecifier) {
                        // the AST node under cursor is a specifier.
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                        return singleResult(new Operation(interface, index, declaration));
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                    }

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                    if (core_declarator && interface->isCursorOn(core_declarator)) {
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                        // got a core-declarator under the text cursor.
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                        return singleResult(new Operation(interface, index, declaration));
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                    }
                }

                break;
            }
        }

        return result;
    }

private:
    class Operation: public CppQuickFixOperation
    {
    public:
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        Operation(const QSharedPointer<const CppQuickFixAssistInterface> &interface, int priority, SimpleDeclarationAST *decl)
            : CppQuickFixOperation(interface, priority)
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            , declaration(decl)
        {
            setDescription(QApplication::translate("CppTools::QuickFix",
                                                   "Split Declaration"));
        }

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        virtual void performChanges(CppRefactoringFile *currentFile, CppRefactoringChanges *)
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        {
            ChangeSet changes;

            SpecifierListAST *specifiers = declaration->decl_specifier_list;
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            int declSpecifiersStart = currentFile->startOf(specifiers->firstToken());
            int declSpecifiersEnd = currentFile->endOf(specifiers->lastToken() - 1);
            int insertPos = currentFile->endOf(declaration->semicolon_token);
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            DeclaratorAST *prevDeclarator = declaration->declarator_list->value;

            for (DeclaratorListAST *it = declaration->declarator_list->next; it; it = it->next) {
                DeclaratorAST *declarator = it->value;

                changes.insert(insertPos, QLatin1String("\n"));
                changes.copy(declSpecifiersStart, declSpecifiersEnd, insertPos);
                changes.insert(insertPos, QLatin1String(" "));
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                changes.move(currentFile->range(declarator), insertPos);
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                changes.insert(insertPos, QLatin1String(";"));

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                const int prevDeclEnd = currentFile->endOf(prevDeclarator);
                changes.remove(prevDeclEnd, currentFile->startOf(declarator));
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                prevDeclarator = declarator;
            }

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            currentFile->change(changes);
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            currentFile->indent(currentFile->range(declaration));
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        }

    private:
        SimpleDeclarationAST *declaration;
    };
};

/*
    Add curly braces to a if statement that doesn't already contain a
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    compound statement. I.e.

    if (a)
        b;
    becomes
    if (a) {
        b;
    }
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    Activates on: the if
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*/
class AddBracesToIfOp: public CppQuickFixFactory
{
public:
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    virtual QList<CppQuickFixOperation::Ptr> match(const QSharedPointer<const CppQuickFixAssistInterface> &interface)
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    {
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        const QList<AST *> &path = interface->path();
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        // show when we're on the 'if' of an if statement
        int index = path.size() - 1;
        IfStatementAST *ifStatement = path.at(index)->asIfStatement();
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        if (ifStatement && interface->isCursorOn(ifStatement->if_token) && ifStatement->statement
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            && ! ifStatement->statement->asCompoundStatement()) {
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            return singleResult(new Operation(interface, index, ifStatement->statement));
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        }

        // or if we're on the statement contained in the if
        // ### This may not be such a good idea, consider nested ifs...
        for (; index != -1; --index) {
            IfStatementAST *ifStatement = path.at(index)->asIfStatement();
            if (ifStatement && ifStatement->statement
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                && interface->isCursorOn(ifStatement->statement)
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                && ! ifStatement->statement->asCompoundStatement()) {
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                return singleResult(new Operation(interface, index, ifStatement->statement));
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            }
        }

        // ### This could very well be extended to the else branch
        // and other nodes entirely.

        return noResult();
    }

private:
    class Operation: public CppQuickFixOperation
    {
    public:
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        Operation(const QSharedPointer<const CppQuickFixAssistInterface> &interface, int priority, StatementAST *statement)
            : CppQuickFixOperation(interface, priority)
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            , _statement(statement)
        {
            setDescription(QApplication::translate("CppTools::QuickFix",
                                                   "Add Curly Braces"));
        }

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        virtual void performChanges(CppRefactoringFile *currentFile, CppRefactoringChanges *)
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        {
            ChangeSet changes;

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            const int start = currentFile->endOf(_statement->firstToken() - 1);
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            changes.insert(start, QLatin1String(" {"));

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            const int end = currentFile->endOf(_statement->lastToken() - 1);
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            changes.insert(end, "\n}");

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            currentFile->change(changes);
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            currentFile->indent(Utils::ChangeSet::Range(start, end));
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        }

    private:
        StatementAST *_statement;
    };
};

/*
    Replace
    if (Type name = foo()) {...}

    With
    Type name = foo;
    if (name) {...}
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    Activates on: the name of the introduced variable
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*/
class MoveDeclarationOutOfIfOp: public CppQuickFixFactory
{
public:
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    virtual QList<CppQuickFixOperation::Ptr> match(const QSharedPointer<const CppQuickFixAssistInterface> &interface)
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    {
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        const QList<AST *> &path = interface->path();
        QSharedPointer<Operation> op(new Operation(interface));
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        int index = path.size() - 1;
        for (; index != -1; --index) {
            if (IfStatementAST *statement = path.at(index)->asIfStatement()) {
                if (statement->match(op->pattern, &op->matcher) && op->condition->declarator) {
                    DeclaratorAST *declarator = op->condition->declarator;
                    op->core = declarator->core_declarator;
                    if (! op->core)
                        return noResult();

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                    if (interface->isCursorOn(op->core)) {
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                        QList<CppQuickFixOperation::Ptr> result;
                        op->setPriority(index);
                        result.append(op);
                        return result;
                    }
                }
            }
        }

        return noResult();
    }

private:
    class Operation: public CppQuickFixOperation
    {
    public:
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        Operation(const QSharedPointer<const CppQuickFixAssistInterface> &interface)
            : CppQuickFixOperation(interface)
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        {
            setDescription(QApplication::translate("CppTools::QuickFix",
                                                   "Move Declaration out of Condition"));

            condition = mk.Condition();
            pattern = mk.IfStatement(condition);
        }

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        virtual void performChanges(CppRefactoringFile *currentFile, CppRefactoringChanges *)
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        {
            ChangeSet changes;

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            changes.copy(currentFile->range(core), currentFile->startOf(condition));
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            int insertPos = currentFile->startOf(pattern);
            changes.move(currentFile->range(condition), insertPos);
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            changes.insert(insertPos, QLatin1String(";\n"));

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            currentFile->change(changes);
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            currentFile->indent(currentFile->range(pattern));
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        }

        ASTMatcher matcher;
        ASTPatternBuilder mk;
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        CPPEditorWidget *editor;
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        ConditionAST *condition;
        IfStatementAST *pattern;
        CoreDeclaratorAST *core;
    };
};

/*
    Replace
    while (Type name = foo()) {...}

    With
    Type name;
    while ((name = foo()) != 0) {...}
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    Activates on: the name of the introduced variable
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*/
class MoveDeclarationOutOfWhileOp: public CppQuickFixFactory
{
public:
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    virtual QList<CppQuickFixOperation::Ptr> match(const QSharedPointer<const CppQuickFixAssistInterface> &interface)
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    {
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        const QList<AST *> &path = interface->path();
        QSharedPointer<Operation> op(new Operation(interface));
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        int index = path.size() - 1;
        for (; index != -1; --index) {
            if (WhileStatementAST *statement = path.at(index)->asWhileStatement()) {
                if (statement->match(op->pattern, &op->matcher) && op->condition->declarator) {
                    DeclaratorAST *declarator = op->condition->declarator;
                    op->core = declarator->core_declarator;

                    if (! op->core)
                        return noResult();

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                    else if (! declarator->equal_token)
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                        return noResult();

                    else if (! declarator->initializer)
                        return noResult();

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                    if (interface->isCursorOn(op->core)) {
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                        QList<CppQuickFixOperation::Ptr> result;
                        op->setPriority(index);
                        result.append(op);
                        return result;
                    }
                }
            }
        }

        return noResult();
    }

private:
    class Operation: public CppQuickFixOperation
    {
    public:
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        Operation(const QSharedPointer<const CppQuickFixAssistInterface> &interface)
            : CppQuickFixOperation(interface)
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        {
            setDescription(QApplication::translate("CppTools::QuickFix",
                                                   "Move Declaration out of Condition"));

            condition = mk.Condition();
            pattern = mk.WhileStatement(condition);
        }

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        virtual void performChanges(CppRefactoringFile *currentFile, CppRefactoringChanges *)
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        {
            ChangeSet changes;

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            changes.insert(currentFile->startOf(condition), QLatin1String("("));
            changes.insert(currentFile->endOf(condition), QLatin1String(") != 0"));
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            int insertPos = currentFile->startOf(pattern);
            const int conditionStart = currentFile->startOf(condition);
            changes.move(conditionStart, currentFile->startOf(core), insertPos);
            changes.copy(currentFile->range(core), insertPos);
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            changes.insert(insertPos, QLatin1String(";\n"));

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            currentFile->change(changes);
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            currentFile->indent(currentFile->range(pattern));
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        }

        ASTMatcher matcher;
        ASTPatternBuilder mk;
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        CPPEditorWidget *editor;
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        ConditionAST *condition;
        WhileStatementAST *pattern;
        CoreDeclaratorAST *core;
    };
};

/*
  Replace
     if (something && something_else) {
     }

  with
     if (something) {
        if (something_else) {
        }
     }

  and
    if (something || something_else)
      x;

  with
    if (something)
      x;
    else if (something_else)
      x;
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    Activates on: && or ||
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*/
class SplitIfStatementOp: public CppQuickFixFactory
{
public:
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    virtual QList<CppQuickFixOperation::Ptr> match(const QSharedPointer<const CppQuickFixAssistInterface> &interface)
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    {
        IfStatementAST *pattern = 0;
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        const QList<AST *> &path = interface->path();
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        int index = path.size() - 1;
        for (; index != -1; --index) {
            AST *node = path.at(index);
            if (IfStatementAST *stmt = node->asIfStatement()) {
                pattern = stmt;
                break;
            }
        }

        if (! pattern || ! pattern->statement)
            return noResult();

        unsigned splitKind = 0;
        for (++index; index < path.size(); ++index) {
            AST *node = path.at(index);
            BinaryExpressionAST *condition = node->asBinaryExpression();
            if (! condition)
                return noResult();

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            Token binaryToken = interface->currentFile().tokenAt(condition->binary_op_token);
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            // only accept a chain of ||s or &&s - no mixing
            if (! splitKind) {
                splitKind = binaryToken.kind();
                if (splitKind != T_AMPER_AMPER && splitKind != T_PIPE_PIPE)
                    return noResult();
                // we can't reliably split &&s in ifs with an else branch
                if (splitKind == T_AMPER_AMPER && pattern->else_statement)
                    return noResult();
            } else if (splitKind != binaryToken.kind()) {
                return noResult();
            }

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            if (interface->isCursorOn(condition->binary_op_token))
                return singleResult(new Operation(interface, index, pattern, condition));
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        }

        return noResult();
    }

private:
    class Operation: public CppQuickFixOperation
    {
    public:
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        Operation(const QSharedPointer<const CppQuickFixAssistInterface> &interface, int priority,
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                  IfStatementAST *pattern, BinaryExpressionAST *condition)
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            : CppQuickFixOperation(interface, priority)
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            , pattern(pattern)
            , condition(condition)
        {
            setDescription(QApplication::translate("CppTools::QuickFix",
                                                   "Split if Statement"));
        }

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        virtual void performChanges(CppRefactoringFile *currentFile, CppRefactoringChanges *)
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        {
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            const Token binaryToken = currentFile->tokenAt(condition->binary_op_token);
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            if (binaryToken.is(T_AMPER_AMPER))
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                splitAndCondition(currentFile);
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            else
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                splitOrCondition(currentFile);
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        }

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        void splitAndCondition(CppRefactoringFile *currentFile)
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        {
            ChangeSet changes;

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            int startPos = currentFile->startOf(pattern);
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            changes.insert(startPos, QLatin1String("if ("));
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            changes.move(currentFile->range(condition->left_expression), startPos);
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            changes.insert(startPos, QLatin1String(") {\n"));

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            const int lExprEnd = currentFile->endOf(condition->left_expression);
            changes.remove(lExprEnd, currentFile->startOf(condition->right_expression));
            changes.insert(currentFile->endOf(pattern), QLatin1String("\n}"));
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            currentFile->change(changes);
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            currentFile->indent(currentFile->range(pattern));
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        }

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        void splitOrCondition(CppRefactoringFile *currentFile)
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        {
            ChangeSet changes;

            StatementAST *ifTrueStatement = pattern->statement;
            CompoundStatementAST *compoundStatement = ifTrueStatement->asCompoundStatement();

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            int insertPos = currentFile->endOf(ifTrueStatement);
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            if (compoundStatement)
                changes.insert(insertPos, QLatin1String(" "));
            else
                changes.insert(insertPos, QLatin1String("\n"));
            changes.insert(insertPos, QLatin1String("else if ("));

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            const int rExprStart = currentFile->startOf(condition->right_expression);
            changes.move(rExprStart, currentFile->startOf(pattern->rparen_token), insertPos);
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            changes.insert(insertPos, QLatin1String(")"));

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            const int rParenEnd = currentFile->endOf(pattern->rparen_token);
            changes.copy(rParenEnd, currentFile->endOf(pattern->statement), insertPos);
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            const int lExprEnd = currentFile->endOf(condition->left_expression);
            changes.remove(lExprEnd, currentFile->startOf(condition->right_expression));
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            currentFile->change(changes);
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            currentFile->indent(currentFile->range(pattern));
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        }

    private:
        IfStatementAST *pattern;
        BinaryExpressionAST *condition;
    };
};

/*
  Replace
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    "abcd" -> QLatin1String("abcd")
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    @"abcd" -> QLatin1String("abcd")
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    'a' -> QLatin1Char('a')
  Except if they are already enclosed in
    QLatin1Char, QT_TRANSLATE_NOOP, tr,
    trUtf8, QLatin1Literal, QLatin1String
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    Activates on: the string literal
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*/
class WrapStringLiteral: public CppQuickFixFactory
{
public:
    enum Type { TypeString, TypeObjCString, TypeChar, TypeNone };

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    virtual QList<CppQuickFixOperation::Ptr> match(const QSharedPointer<const CppQuickFixAssistInterface> &interface)
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    {
        ExpressionAST *literal = 0;
        Type type = TypeNone;
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        const QList<AST *> &path = interface->path();
        const CppRefactoringFile &file = interface->currentFile();
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        if (path.isEmpty())
            return noResult(); // nothing to do

        literal = path.last()->asStringLiteral();

        if (! literal) {
            literal = path.last()->asNumericLiteral();
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            if (!literal || !file.tokenAt(literal->asNumericLiteral()->literal_token).is(T_CHAR_LITERAL))
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                return noResult();
            else
                type = TypeChar;
        } else {
            type = TypeString;
        }

        if (path.size() > 1) {
            if (CallAST *call = path.at(path.size() - 2)->asCall()) {
                if (call->base_expression) {
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                    if (IdExpressionAST *idExpr = call->base_expression->asIdExpression()) {
                        if (SimpleNameAST *functionName = idExpr->name->asSimpleName()) {
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                            const QByteArray id(file.tokenAt(functionName->identifier_token).identifier->chars());
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                            if (id == "QT_TRANSLATE_NOOP" || id == "tr" || id == "trUtf8"
                                    || (type == TypeString && (id == "QLatin1String" || id == "QLatin1Literal"))
                                    || (type == TypeChar && id == "QLatin1Char"))
                                return noResult(); // skip it
                        }
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                    }
                }
            }
        }

        if (type == TypeString) {
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            if (file.charAt(file.startOf(literal)) == QLatin1Char('@'))
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                type = TypeObjCString;
        }
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        return singleResult(new Operation(interface,
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                                          path.size() - 1, // very high priority
                                          type,
                                          literal));
    }

private:
    class Operation: public CppQuickFixOperation
    {
    public:
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        Operation(const QSharedPointer<const CppQuickFixAssistInterface> &interface, int priority, Type type,
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                  ExpressionAST *literal)
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            : CppQuickFixOperation(interface, priority)
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            , type(type)
            , literal(literal)
        {
            if (type == TypeChar)
                setDescription(QApplication::translate("CppTools::QuickFix",
                                                       "Enclose in QLatin1Char(...)"));
            else
                setDescription(QApplication::translate("CppTools::QuickFix",
                                                       "Enclose in QLatin1String(...)"));
        }

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        virtual void performChanges(CppRefactoringFile *currentFile, CppRefactoringChanges *)
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        {
            ChangeSet changes;

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            QLatin1String replacement = (type == TypeChar ? QLatin1String("QLatin1Char(")
                                                          : QLatin1String("QLatin1String("));

            if (type == TypeObjCString)
                changes.replace(startPos, startPos + 1, replacement);
            else
                changes.insert(startPos, replacement);

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            changes.insert(currentFile->endOf(literal), ")");
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            currentFile->change(changes);
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        }

    private:
        Type type;
        ExpressionAST *literal;
    };
};

/*
  Replace
    "abcd"
  With
    tr("abcd") or
    QCoreApplication::translate("CONTEXT", "abcd") or
    QT_TRANSLATE_NOOP("GLOBAL", "abcd")
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    Activates on: the string literal
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*/
class TranslateStringLiteral: public CppQuickFixFactory
{
public:
    enum TranslationOption { unknown, useTr, useQCoreApplicationTranslate, useMacro };