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

1 files changed, 433 insertions, 0 deletions

diff --git a/src/xmlpatterns/parser/qparsercontext_p.h b/src/xmlpatterns/parser/qparsercontext_p.h
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+/****************************************************************************
+**
+** 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 QtXmlPatterns module 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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//
+//  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;
+
+    /**
+     * @short Contains data used when parsing and tokenizing.
+     *
+     * When ExpressionFactory::create() is called, an instance of this class
+     * is passed to the scanner and parser. It holds all information that is
+     * needed to create the expression.
+     *
+     * @author Frans Englich <frans.englich@nokia.com>
+     */
+    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;
+
+        /**
+         * Constructs a ParserContext instance.
+         *
+         * @param context the static context as defined in XPath. This contain
+         * namespace bindings, error handler, and other information necessary
+         * for creating an XPath expression.
+         * @param lang the particular XPath language sub-set that should be parsed
+         * @param tokenizer the Tokenizer to use.
+         * @see ExpressionFactory::LanguageAccent
+         */
+        ParserContext(const StaticContext::Ptr &context,
+                      const QXmlQuery::QueryLanguage lang,
+                      Tokenizer *const tokenizer);
+
+        /**
+         * @short Removes the recently pushed variables from
+         * scope. The amount of removed variables is @p amount.
+         *
+         * finalizePushedVariable() can be seen as popping the variable.
+         *
+         */
+        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;
+        }
+
+        /**
+         * The namespaces declared with <tt>declare namespace</tt>.
+         */
+        QStringList declaredPrefixes;
+
+        /**
+         * This is a temporary stack, used for keeping variables in scope,
+         * such as for function arguments & let clauses.
+         */
+        VariableDeclaration::Stack variables;
+
+        inline bool isXSLT() const
+        {
+            return languageAccent == QXmlQuery::XSLT20;
+        }
+
+        const StaticContext::Ptr staticContext;
+        /**
+         * We don't store a Tokenizer::Ptr here, because then we would get a
+         * circular referencing between ParserContext and XSLTTokenizer, and
+         * hence they would never destruct.
+         */
+        Tokenizer *const tokenizer;
+        const QXmlQuery::QueryLanguage languageAccent;
+
+        /**
+         * Only used in the case of XSL-T. Is the name of the initial template
+         * to call. If null, no name was provided, and regular template
+         * matching should be done.
+         */
+        QXmlName initialTemplateName;
+
+        /**
+         * Used when parsing direct element constructors. It is used
+         * for ensuring tags are well-balanced.
+         */
+        QStack<QXmlName> tagStack;
+
+        /**
+         * The actual expression, the Query. This member may be @c null,
+         * such as in the case of an XQuery library module.
+         */
+        Expression::Ptr queryBody;
+
+        /**
+         * The user functions declared in the prolog.
+         */
+        UserFunction::List userFunctions;
+
+        /**
+         * Contains all calls to user defined functions.
+         */
+        UserFunctionCallsite::List userFunctionCallsites;
+
+        /**
+         * All variables declared with <tt>declare variable</tt>.
+         */
+        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;
+
+        /**
+         * The library module namespace set with <tt>declare module</tt>.
+         */
+        QXmlName::NamespaceCode moduleNamespace;
+
+        /**
+         * When a direct element constructor is processed, resolvers are
+         * created in order to carry the namespace declarations. In such case,
+         * the old resolver is pushed here.
+         */
+        QStack<NamespaceResolver::Ptr> resolvers;
+
+        /**
+         * This is used for handling the following obscene case:
+         *
+         * - <tt>\<e\>{1}{1}\<\/e\></tt> produce <tt>\<e\>11\</e\></tt>
+         * - <tt>\<e\>{1, 1}\<\/e\></tt> produce <tt>\<e\>1 1\</e\></tt>
+         *
+         * This boolean tracks whether the previous reduction inside element
+         * content was done with an enclosed expression.
+         */
+        bool isPreviousEnclosedExpr;
+
+        int elementConstructorDepth;
+
+        QStack<bool> scanOnlyStack;
+
+        QStack<OrderBy::Stability> orderStability;
+
+        /**
+         * Whether any prolog declaration that must occur after the first
+         * group has been encountered.
+         */
+        bool hasSecondPrologPart;
+
+        bool preserveNamespacesMode;
+        bool inheritNamespacesMode;
+
+        /**
+         * Contains all named templates. Since named templates
+         * can also have rules, each body may also be in templateRules.
+         */
+        QHash<QXmlName, Template::Ptr>  namedTemplates;
+
+        /**
+         * All the @c xsl:call-template instructions that we have encountered.
+         */
+        QVector<Expression::Ptr>         templateCalls;
+
+        /**
+         * If we're in XSL-T, and a variable reference is encountered
+         * which isn't in-scope, it's added to this hash since a global
+         * variable declaration may appear later on.
+         *
+         * We use a multi hash, since we can encounter several references to
+         * the same variable before it's declared.
+         */
+        QMultiHash<QXmlName, Expression::Ptr> unresolvedVariableReferences;
+
+        /**
+         *
+         * Contains the encountered template rules, as opposed
+         * to named templates.
+         *
+         * The key is the name of the template mode. If it's a default
+         * constructed value, it's the default mode.
+         *
+         * Since templates rules may also be named, each body may also be in
+         * namedTemplates.
+         *
+         * To be specific, the values are not the templates, the values are
+         * modes, and the TemplateMode contains the patterns and bodies.
+         */
+        QHash<QXmlName, TemplateMode::Ptr>  templateRules;
+
+        /**
+         * @short Returns the TemplateMode for @p modeName or @c null if the
+         * mode being asked for is @c #current.
+         */
+        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;
+        }
+
+        /**
+         * The @c xsl:param appearing inside template.
+         */
+        VariableDeclaration::List templateParameters;
+
+        /**
+         * The @c xsl:with-param appearing in template calling instruction.
+         */
+        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();
+        }
+
+        /**
+         * This is used to deal with XSL-T's exception to the @c node() type,
+         * which doesn't match document nodes.
+         */
+        bool                                isParsingPattern;
+
+        ImportPrecedence                    currentImportPrecedence;
+
+        bool isFirstTemplate() const
+        {
+            return m_currentTemplateID == InitialTemplateID;
+        }
+
+        /**
+         * Whether we're processing XSL-T 1.0 code.
+         */
+        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;
+
+        /**
+         * The default is @c false. If we're not parsing @c xsl:with-param,
+         * hence parsing @c xsl:param, the value has changed.
+         */
+        QStack<bool>                        m_isParsingWithParam;
+        Q_DISABLE_COPY(ParserContext)
+    };
+}
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif