util/lexgen/generator.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 19 Feb 2010 23:40:16 +0200
branchRCL_3
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Revision: 201003 Kit: 201007
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/****************************************************************************
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**
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the utils of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file.  Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** 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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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**
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**
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#ifndef GENERATOR_H
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#define GENERATOR_H
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#include <QTextStream>
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#include <QStringList>
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#include "nfa.h"
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class LineStream
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{
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private:
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    struct SharedStream
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    {
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        int ref;
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        QTextStream *stream;
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    };
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public:
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    LineStream(QTextStream *textStream)
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    {
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        shared = new SharedStream;
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        shared->ref = 1;
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        shared->stream = textStream;
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    }
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    LineStream(const LineStream &other)
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    {
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        shared = other.shared;
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        shared->ref++;
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    }
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    LineStream &operator=(const LineStream &other)
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    {
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        if (this == &other)
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            return *this;
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        LineStream copy(other); // keep refcount up
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        qSwap(*shared, *other.shared);
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        return *this;
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    }
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    ~LineStream()
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    {
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        if (!--shared->ref) {
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            (*shared->stream) << endl;
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            delete shared;
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        }
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    }
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    template <typename T>
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    LineStream &operator<<(const T &value)
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    { (*shared->stream) << value; return *this; }
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    SharedStream *shared;
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};
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class CodeBlock
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{
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public:
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    inline CodeBlock() { stream.setString(&output, QIODevice::WriteOnly); }
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    inline void indent() { indentStr += QLatin1String("    "); }
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    inline void outdent() { indentStr.remove(0, 4); }
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    template <typename T>
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    LineStream operator<<(const T &value)
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    { stream << indentStr; stream << value; return LineStream(&stream); }
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    inline void addNewLine() { stream << endl; }
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    inline QString toString() const { stream.flush(); return output; }
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private:
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    QString output;
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    mutable QTextStream stream;
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    QString indentStr;
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};
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class Function
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{
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public:
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    inline Function(const QString &returnType, const QString &name)
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        : rtype(returnType), fname(name), iline(false), cnst(false) {}
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    inline Function() : iline(false), cnst(false) {}
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    inline void setName(const QString &name) { fname = name; }
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    inline QString name() const { return fname; }
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    inline void setInline(bool i) { iline = i; }
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    inline bool isInline() const { return iline; }
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    inline void setReturnType(const QString &type) { rtype = type; }
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    inline QString returnType() const { return rtype; }
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    inline void addBody(const QString &_body) { body += _body; }
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    inline void addBody(const CodeBlock &block) { body += block.toString(); }
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    inline bool hasBody() const { return !body.isEmpty(); }
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    inline void setConst(bool konst) { cnst = konst; }
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    inline bool isConst() const { return cnst; }
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    void printDeclaration(CodeBlock &block, const QString &funcNamePrefix = QString()) const;
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    QString definition() const;
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private:
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    QString signature(const QString &funcNamePrefix = QString()) const;
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    QString rtype;
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    QString fname;
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    QString body;
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    bool iline;
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    bool cnst;
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};
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class Class
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{
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public:
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    enum Access { PublicMember, ProtectedMember, PrivateMember };
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    inline Class(const QString &name) : cname(name) {}
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    inline void setName(const QString &name) { cname = name; }
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    inline QString name() const { return cname; }
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    inline void addMember(Access access, const QString &name)
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    { sections[access].variables.append(name); }
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    inline void addMember(Access access, const Function &func)
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    { sections[access].functions.append(func); }
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    void addConstructor(Access access, const QString &body, const QString &args = QString());
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    inline void addConstructor(Access access, const CodeBlock &body, const QString &args = QString())
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    { addConstructor(access, body.toString(), args); }
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    QString declaration() const;
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    QString definition() const;
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private:
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    QString cname;
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    struct Section
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    {
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        QVector<Function> functions;
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        QStringList variables;
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        QVector<Function> constructors;
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        inline bool isEmpty() const
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        { return functions.isEmpty() && variables.isEmpty() && constructors.isEmpty(); }
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        void printDeclaration(const Class *klass, CodeBlock &block) const;
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        QString definition(const Class *klass) const;
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    };
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    Section sections[3];
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};
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class Generator
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{
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public:
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    Generator(const DFA &dfa, const Config &config);
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    QString generate();
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private:
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    void generateTransitions(CodeBlock &body, const TransitionMap &transitions);
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    bool isSingleReferencedFinalState(int i) const;
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    DFA dfa;
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    Config cfg;
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    InputType minInput;
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    InputType maxInput;
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    QHash<int, int> backReferenceMap;
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    QString headerFileName;
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public:
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    struct TransitionSequence
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    {
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        inline TransitionSequence() : first(-1), last(-1), transition(-1) {}
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        InputType first;
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        InputType last;
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        int transition;
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        QString testFunction;
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    };
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private:
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    QVector<TransitionSequence> charFunctionRanges;
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};
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#endif