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Diffstat (limited to 'src/xmlpatterns/expr/qvariabledeclaration_p.h')
| -rw-r--r-- | src/xmlpatterns/expr/qvariabledeclaration_p.h | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/src/xmlpatterns/expr/qvariabledeclaration_p.h b/src/xmlpatterns/expr/qvariabledeclaration_p.h new file mode 100644 index 0000000..efc5c57 --- /dev/null +++ b/src/xmlpatterns/expr/qvariabledeclaration_p.h @@ -0,0 +1,203 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (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 either Technology Preview License Agreement or the +** Beta Release License Agreement. +** +** 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 1.0, included in the file LGPL_EXCEPTION.txt in this +** package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3.0 as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** If you are unsure which license is appropriate for your use, please +** contact the sales department at qt-sales@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_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 +{ + /** + * @short Represents a declared variable. Only used at + * the compilation stage. + * + * @see FunctionArgument + * @author Frans Englich <fenglich@trolltech.com> + * @ingroup Patternist_expressions + */ + class VariableDeclaration : public QSharedData + { + public: + typedef QExplicitlySharedDataPointer<VariableDeclaration> Ptr; + typedef QStack<VariableDeclaration::Ptr> Stack; + typedef QList<VariableDeclaration::Ptr> List; + + /** + * @short The key is the variable name. + */ + typedef QHash<QXmlName, VariableDeclaration::Ptr> Hash; + + enum Type + { + RangeVariable, + ExpressionVariable, + FunctionArgument, + PositionalVariable, + TemplateParameter, + + /** + * A global variable is always an external variable, but it is + * cached differently. + * + * @see DynamicContext::globalItemCacheCell() + */ + GlobalVariable, + + /** + * External variables doesn't use slots, that's a big difference + * compared to the other types. + */ + ExternalVariable + }; + + /** + * Creates a VariableDeclaration. + * + * @p sourceExpr and @p seqType may be @c null. + */ + 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; + } + + /** + * @short Returns how many times this variable is used. + */ + inline bool usedByMany() const + { + return references.count() > 1; + } + + /** + * @short Returns @c true if @p list contains @p lookup. + */ + static bool contains(const VariableDeclaration::List &list, + const QXmlName &lookup); + + const QXmlName name; + const VariableSlotID slot; + const Type type; + + /** + * The declared type of the variable. What the value might be, depends + * on the context which VariableDeclaration is used in. Note that + * sequenceType is hence not in anyway obligated to the type of + * expression(). + */ + const SequenceType::Ptr sequenceType; + VariableReference::List references; + + /** + * @short Whether a reference can rewrite itself to expression(). + * + * The default value is @c true. + */ + bool canSourceRewrite; + + private: + Expression::Ptr m_expression; + Q_DISABLE_COPY(VariableDeclaration) + }; + + /** + * @short Formats @p var appropriately for display. + * + * @relates 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 |