qvariabledeclaration_p.h

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//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.

#ifndef Patternist_VariableDeclaration_H
#define Patternist_VariableDeclaration_H

#include <QSharedData>

#include "qexpression_p.h"
#include "qpatternistlocale_p.h"
#include "qvariablereference_p.h"

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

template<typename T> class QStack;

namespace QPatternist
{
    class VariableDeclaration : public QSharedData
    {
    public:
        typedef QExplicitlySharedDataPointer<VariableDeclaration> Ptr;
        typedef QStack<VariableDeclaration::Ptr> Stack;
        typedef QList<VariableDeclaration::Ptr> List;

        typedef QHash<QXmlName, VariableDeclaration::Ptr> Hash;

        enum Type
        {
            RangeVariable,
            ExpressionVariable,
            FunctionArgument,
            PositionalVariable,
            TemplateParameter,

            GlobalVariable,

            ExternalVariable
        };

        VariableDeclaration(const QXmlName n,
                            const VariableSlotID varSlot,
                            const Type t,
                            const SequenceType::Ptr &seqType) : name(n)
                                                              , slot(varSlot)
                                                              , type(t)
                                                              , sequenceType(seqType)
                                                              , canSourceRewrite(true)
        {
            Q_ASSERT(!name.isNull());
            Q_ASSERT(t == ExternalVariable || t == TemplateParameter || varSlot > -1);
        }

        inline bool isUsed() const
        {
            return !references.isEmpty();
        }

        inline const Expression::Ptr &expression() const
        {
            return m_expression;
        }

        inline void setExpression(const Expression::Ptr &expr)
        {
            m_expression = expr;
        }

        inline bool usedByMany() const
        {
            return references.count() > 1;
        }

        static bool contains(const VariableDeclaration::List &list,
                             const QXmlName &lookup);

        const QXmlName                  name;
        const VariableSlotID            slot;
        const Type                      type;

        const SequenceType::Ptr         sequenceType;
        VariableReference::List         references;

        bool canSourceRewrite;

    private:
        Expression::Ptr                 m_expression;
        Q_DISABLE_COPY(VariableDeclaration)
    };

    static inline QString formatKeyword(const VariableDeclaration::Ptr &var,
                                        const NamePool::Ptr &np)
    {
        Q_ASSERT(var);
        Q_ASSERT(np);
        return formatKeyword(np->displayName(var->name));
    }

}

QT_END_NAMESPACE

QT_END_HEADER

#endif