qparsercontext_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_ParserContext_H
#define Patternist_ParserContext_H

#include <QFlags>
#include <QSharedData>
#include <QStack>
#include <QStringList>
#include <QtGlobal>
#include <QXmlQuery>

#include "qbuiltintypes_p.h"
#include "qfunctionsignature_p.h"
#include "qorderby_p.h"
#include "qtemplatemode_p.h"
#include "quserfunctioncallsite_p.h"
#include "quserfunction_p.h"
#include "qvariabledeclaration_p.h"

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

namespace QPatternist
{
    class Tokenizer;

    class ParserContext : public QSharedData
    {
    public:
        typedef QExplicitlySharedDataPointer<ParserContext> Ptr;

        enum PrologDeclaration
        {
            BoundarySpaceDecl               = 1,
            DefaultCollationDecl            = 2,
            BaseURIDecl                     = 4,
            ConstructionDecl                = 8,
            OrderingModeDecl                = 16,
            EmptyOrderDecl                  = 32,
            CopyNamespacesDecl              = 64,
            DeclareDefaultElementNamespace  = 128,
            DeclareDefaultFunctionNamespace = 256
        };

        typedef QFlags<PrologDeclaration> PrologDeclarations;

        ParserContext(const StaticContext::Ptr &context,
                      const QXmlQuery::QueryLanguage lang,
                      Tokenizer *const tokenizer);

        void finalizePushedVariable(const int amount = 1,
                                    const bool shouldPop = true);

        inline VariableSlotID allocatePositionalSlot()
        {
            ++m_positionSlot;
            return m_positionSlot;
        }

        inline VariableSlotID allocateExpressionSlot()
        {
            const VariableSlotID retval = m_expressionSlot;
            ++m_expressionSlot;
            return retval;
        }

        inline VariableSlotID allocateGlobalVariableSlot()
        {
            ++m_globalVariableSlot;
            return m_globalVariableSlot;
        }

        inline bool hasDeclaration(const PrologDeclaration decl) const
        {
            return m_prologDeclarations.testFlag(decl);
        }

        inline void registerDeclaration(const PrologDeclaration decl)
        {
            m_prologDeclarations |= decl;
        }

        QStringList declaredPrefixes;

        VariableDeclaration::Stack variables;

        inline bool isXSLT() const
        {
            return languageAccent == QXmlQuery::XSLT20;
        }

        const StaticContext::Ptr staticContext;
        Tokenizer *const tokenizer;
        const QXmlQuery::QueryLanguage languageAccent;

        QXmlName initialTemplateName;

        QStack<QXmlName> tagStack;

        Expression::Ptr queryBody;

        UserFunction::List userFunctions;

        UserFunctionCallsite::List userFunctionCallsites;

        VariableDeclaration::List declaredVariables;

        inline VariableSlotID currentPositionSlot() const
        {
            return m_positionSlot;
        }

        inline VariableSlotID currentExpressionSlot() const
        {
            return m_expressionSlot;
        }

        inline void restoreNodeTestSource()
        {
            nodeTestSource = BuiltinTypes::element;
        }

        inline VariableSlotID allocateCacheSlot()
        {
            return ++m_evaluationCacheSlot;
        }

        inline VariableSlotID allocateCacheSlots(const int count)
        {
            const VariableSlotID retval = m_evaluationCacheSlot + 1;
            m_evaluationCacheSlot += count + 1;
            return retval;
        }

        ItemType::Ptr nodeTestSource;

        QStack<Expression::Ptr> typeswitchSource;

        QXmlName::NamespaceCode moduleNamespace;

        QStack<NamespaceResolver::Ptr> resolvers;

        bool isPreviousEnclosedExpr;

        int elementConstructorDepth;

        QStack<bool> scanOnlyStack;

        QStack<OrderBy::Stability> orderStability;

        bool hasSecondPrologPart;

        bool preserveNamespacesMode;
        bool inheritNamespacesMode;

        QHash<QXmlName, Template::Ptr>  namedTemplates;

        QVector<Expression::Ptr>         templateCalls;

        QMultiHash<QXmlName, Expression::Ptr> unresolvedVariableReferences;

        QHash<QXmlName, TemplateMode::Ptr>  templateRules;

        TemplateMode::Ptr modeFor(const QXmlName &modeName)
        {
            /* #current is not a mode, so it cannot contain templates. #current
             * specifies how to look up templates wrt. mode. This check helps
             * code that calls us, asking for the mode it needs to lookup in.
             */
            if(modeName == QXmlName(StandardNamespaces::InternalXSLT, StandardLocalNames::current))
                return TemplateMode::Ptr();

            TemplateMode::Ptr &mode = templateRules[modeName];

            if(!mode)
                mode = TemplateMode::Ptr(new TemplateMode(modeName));

            Q_ASSERT(templateRules[modeName]);
            return mode;
        }

        inline TemplatePattern::ID allocateTemplateID()
        {
            ++m_currentTemplateID;
            return m_currentTemplateID;
        }

        VariableDeclaration::List templateParameters;

        WithParam::Hash templateWithParams;

        inline void templateParametersHandled()
        {
            finalizePushedVariable(templateParameters.count());
            templateParameters.clear();
        }

        inline void templateWithParametersHandled()
        {
            templateWithParams.clear();
        }

        inline bool isParsingWithParam() const
        {
            return m_isParsingWithParam.top();
        }

        void startParsingWithParam()
        {
            m_isParsingWithParam.push(true);
        }

        void endParsingWithParam()
        {
            m_isParsingWithParam.pop();
        }

        bool                                isParsingPattern;

        ImportPrecedence                    currentImportPrecedence;

        bool isFirstTemplate() const
        {
            return m_currentTemplateID == InitialTemplateID;
        }

        QStack<bool> isBackwardsCompat;

    private:
        enum
        {
            InitialTemplateID = -1
        };

        VariableSlotID                      m_evaluationCacheSlot;
        VariableSlotID                      m_expressionSlot;
        VariableSlotID                      m_positionSlot;
        PrologDeclarations                  m_prologDeclarations;
        VariableSlotID                      m_globalVariableSlot;
        TemplatePattern::ID                 m_currentTemplateID;

        QStack<bool>                        m_isParsingWithParam;
        Q_DISABLE_COPY(ParserContext)
    };
}

QT_END_NAMESPACE

QT_END_HEADER

#endif