Initial import from the monolithic Qt.

This is the beginning of revision history for this module. If you
want to look at revision history older than this, please refer to the
Qt Git wiki for how to use Git history grafting. At the time of
writing, this wiki is located here:

http://qt.gitorious.org/qt/pages/GitIntroductionWithQt

If you have already performed the grafting and you don't see any
history beyond this commit, try running "git log" with the "--follow"
argument.

Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 221 insertions, 0 deletions

diff --git a/util/lexgen/generator.h b/util/lexgen/generator.h
new file mode 100644
index 0000000000..b9df8d74fa
--- /dev/null
+++ b/util/lexgen/generator.h
@@ -0,0 +1,221 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the utils of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** 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.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#ifndef GENERATOR_H
+#define GENERATOR_H
+
+#include <QTextStream>
+#include <QStringList>
+
+#include "nfa.h"
+
+class LineStream
+{
+private:
+    struct SharedStream
+    {
+        int ref;
+        QTextStream *stream;
+    };
+
+public:
+    LineStream(QTextStream *textStream)
+    {
+        shared = new SharedStream;
+        shared->ref = 1;
+        shared->stream = textStream;
+    }
+    LineStream(const LineStream &other)
+    {
+        shared = other.shared;
+        shared->ref++;
+    }
+    LineStream &operator=(const LineStream &other)
+    {
+        if (this == &other)
+            return *this;
+        LineStream copy(other); // keep refcount up
+        qSwap(*shared, *other.shared);
+        return *this;
+    }
+    ~LineStream()
+    {
+        if (!--shared->ref) {
+            (*shared->stream) << endl;
+            delete shared;
+        }
+    }
+    
+    template <typename T>
+    LineStream &operator<<(const T &value)
+    { (*shared->stream) << value; return *this; }
+    
+    SharedStream *shared;
+};
+
+class CodeBlock
+{
+public:
+    inline CodeBlock() { stream.setString(&output, QIODevice::WriteOnly); }
+
+    inline void indent() { indentStr += QLatin1String("    "); }
+    inline void outdent() { indentStr.remove(0, 4); }
+
+    template <typename T>
+    LineStream operator<<(const T &value)
+    { stream << indentStr; stream << value; return LineStream(&stream); }
+    
+    inline void addNewLine() { stream << endl; }
+    
+    inline QString toString() const { stream.flush(); return output; }
+    
+private:
+    QString output;
+    mutable QTextStream stream;
+    QString indentStr;
+};
+
+class Function
+{
+public:
+    inline Function(const QString &returnType, const QString &name)
+        : rtype(returnType), fname(name), iline(false), cnst(false) {}
+    inline Function() : iline(false), cnst(false) {}
+
+    inline void setName(const QString &name) { fname = name; }
+    inline QString name() const { return fname; }
+    
+    inline void setInline(bool i) { iline = i; }
+    inline bool isInline() const { return iline; }
+    
+    inline void setReturnType(const QString &type) { rtype = type; }
+    inline QString returnType() const { return rtype; }
+    
+    inline void addBody(const QString &_body) { body += _body; }
+    inline void addBody(const CodeBlock &block) { body += block.toString(); }
+    inline bool hasBody() const { return !body.isEmpty(); }
+    
+    inline void setConst(bool konst) { cnst = konst; }
+    inline bool isConst() const { return cnst; }
+    
+    void printDeclaration(CodeBlock &block, const QString &funcNamePrefix = QString()) const;
+    QString definition() const;
+
+private:
+    QString signature(const QString &funcNamePrefix = QString()) const;
+
+    QString rtype;
+    QString fname;
+    QString body;
+    bool iline;
+    bool cnst;
+};
+
+class Class
+{
+public:
+    enum Access { PublicMember, ProtectedMember, PrivateMember };
+
+    inline Class(const QString &name) : cname(name) {}
+
+    inline void setName(const QString &name) { cname = name; }
+    inline QString name() const { return cname; }
+    
+    inline void addMember(Access access, const QString &name)
+    { sections[access].variables.append(name); }
+    inline void addMember(Access access, const Function &func)
+    { sections[access].functions.append(func); }
+    
+    void addConstructor(Access access, const QString &body, const QString &args = QString());
+    inline void addConstructor(Access access, const CodeBlock &body, const QString &args = QString())
+    { addConstructor(access, body.toString(), args); }
+    
+    QString declaration() const;
+    QString definition() const;
+    
+private:
+    QString cname;
+    struct Section
+    {
+        QVector<Function> functions;
+        QStringList variables;
+        QVector<Function> constructors;
+        
+        inline bool isEmpty() const
+        { return functions.isEmpty() && variables.isEmpty() && constructors.isEmpty(); }
+        
+        void printDeclaration(const Class *klass, CodeBlock &block) const;
+        QString definition(const Class *klass) const;
+    };
+
+    Section sections[3];
+};
+
+class Generator
+{
+public:
+    Generator(const DFA &dfa, const Config &config);
+    
+    QString generate();
+    
+private:
+    void generateTransitions(CodeBlock &body, const TransitionMap &transitions);
+    bool isSingleReferencedFinalState(int i) const;
+
+    DFA dfa;
+    Config cfg;
+    InputType minInput;
+    InputType maxInput;
+    QHash<int, int> backReferenceMap;
+    QString headerFileName;
+public:
+    struct TransitionSequence
+    {
+        inline TransitionSequence() : first(-1), last(-1), transition(-1) {}
+        InputType first;
+        InputType last;
+        int transition;
+        QString testFunction;
+    };
+private:
+    QVector<TransitionSequence> charFunctionRanges;
+};
+
+#endif