qt-creator/src/plugins/cppeditor/cppinsertdecldef.cpp

/**************************************************************************
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** This file is part of Qt Creator
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** Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
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** 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
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#include "cppinsertdecldef.h"

#include <AST.h>
#include <ASTVisitor.h>
#include <CoreTypes.h>
#include <Names.h>
#include <Symbols.h>
#include <TranslationUnit.h>
#include <cplusplus/ASTPath.h>
#include <cplusplus/InsertionPointLocator.h>
#include <cplusplus/LookupContext.h>
#include <cplusplus/Overview.h>

#include <QtCore/QCoreApplication>

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

using CppEditor::CppRefactoringChanges;

namespace {

class Operation: public CppQuickFixOperation
{
public:
    Operation(const CppQuickFixState &state, int priority,
              const QString &targetFileName, const Class *targetSymbol,
              InsertionPointLocator::AccessSpec xsSpec,
              const QString &decl)
        : CppQuickFixOperation(state, priority)
        , m_targetFileName(targetFileName)
        , m_targetSymbol(targetSymbol)
        , m_xsSpec(xsSpec)
        , m_decl(decl)
    {
        QString type;
        switch (xsSpec) {
        case InsertionPointLocator::Public: type = QLatin1String("public"); break;
        case InsertionPointLocator::Protected: type = QLatin1String("protected"); break;
        case InsertionPointLocator::Private: type = QLatin1String("private"); break;
        case InsertionPointLocator::PublicSlot: type = QLatin1String("public slot"); break;
        case InsertionPointLocator::ProtectedSlot: type = QLatin1String("protected slot"); break;
        case InsertionPointLocator::PrivateSlot: type = QLatin1String("private slot"); break;
        default: break;
        }

        setDescription(QCoreApplication::tr("Add %1 declaration",
                                            "CppEditor::DeclFromDef").arg(type));
    }

    void performChanges(CppRefactoringFile *, CppRefactoringChanges *refactoring)
    {
        CppRefactoringFile targetFile = refactoring->file(m_targetFileName);
        Document::Ptr targetDoc = targetFile.cppDocument();
        InsertionPointLocator locator(targetDoc);
        const InsertionLocation loc = locator.methodDeclarationInClass(m_targetSymbol, m_xsSpec);
        Q_ASSERT(loc.isValid());

        int targetPosition1 = targetFile.position(loc.line(), loc.column());
        int targetPosition2 = qMax(0, targetFile.position(loc.line(), 1) - 1);

        Utils::ChangeSet target;
        target.insert(targetPosition1, loc.prefix() + m_decl);
        targetFile.change(target);
        targetFile.indent(Utils::ChangeSet::Range(targetPosition2, targetPosition1));

        const int prefixLineCount = loc.prefix().count(QLatin1Char('\n'));
        refactoring->activateEditor(m_targetFileName, loc.line() + prefixLineCount,
                                    qMax(((int) loc.column()) - 1, 0));
    }

private:
    QString m_targetFileName;
    const Class *m_targetSymbol;
    InsertionPointLocator::AccessSpec m_xsSpec;
    QString m_decl;
};

} // anonymous namespace

QList<CppQuickFixOperation::Ptr> DeclFromDef::match(const CppQuickFixState &state)
{
    const QList<AST *> &path = state.path();
    const CppRefactoringFile &file = state.currentFile();

    FunctionDefinitionAST *funDef = 0;
    int idx = 0;
    for (; idx < path.size(); ++idx) {
        AST *node = path.at(idx);
        if (idx > 1) {
            if (DeclaratorIdAST *declId = node->asDeclaratorId()) {
                if (file.isCursorOn(declId)) {
                    if (FunctionDefinitionAST *candidate = path.at(idx - 2)->asFunctionDefinition()) {
                        if (funDef) {
                            return noResult();
                        } else {
                            funDef = candidate;
                            break;
                        }
                    }
                }
            }
        }

        if (node->asClassSpecifier()) {
            return noResult();
        }
    }

    if (!funDef || !funDef->symbol)
        return noResult();

    Function *method = funDef->symbol;

    if (ClassOrNamespace *targetBinding = state.context().lookupParent(method)) {
        foreach (Symbol *s, targetBinding->symbols()) {
            if (Class *clazz = s->asClass()) {
                QList<CppQuickFixOperation::Ptr> results;
                const QLatin1String fn(clazz->fileName());
                const QString decl = generateDeclaration(state,
                                                         method,
                                                         targetBinding);
                results.append(singleResult(new Operation(state, idx, fn, clazz,
                                                          InsertionPointLocator::Public,
                                                          decl)));
                results.append(singleResult(new Operation(state, idx, fn, clazz,
                                                          InsertionPointLocator::Protected,
                                                          decl)));
                results.append(singleResult(new Operation(state, idx, fn, clazz,
                                                          InsertionPointLocator::Private,
                                                          decl)));
                results.append(singleResult(new Operation(state, idx, fn, clazz,
                                                          InsertionPointLocator::PublicSlot,
                                                          decl)));
                results.append(singleResult(new Operation(state, idx, fn, clazz,
                                                          InsertionPointLocator::ProtectedSlot,
                                                          decl)));
                results.append(singleResult(new Operation(state, idx, fn, clazz,
                                                          InsertionPointLocator::PrivateSlot,
                                                          decl)));
                return results;
            } //! \todo support insertion of non-methods into namespaces
        }
    }

    return noResult();
}

QString DeclFromDef::generateDeclaration(const CppQuickFixState &,
                                         Function *method,
                                         ClassOrNamespace *targetBinding)
{
    Q_UNUSED(targetBinding);

    Overview oo;
    oo.setShowFunctionSignatures(true);
    oo.setShowReturnTypes(true);
    oo.setShowArgumentNames(true);

    QString decl;
    decl += oo(method->type(), method->unqualifiedName());
    decl += QLatin1String(";\n");

    return decl;
}