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46 // This file is not part of the Qt API. It exists purely as an
47 // implementation detail. This header file may change from version to
48 // version without notice, or even be removed.
52 #ifndef Patternist_StackContextBase_H
53 #define Patternist_StackContextBase_H
57 #include <private/qdaytimeduration_p.h>
58 #include <private/qdelegatingdynamiccontext_p.h>
59 #include <private/qexpression_p.h>
68 * @short Base class for all DynamicContext classes that needs to supply
69 * variables. It has a new frame for local caches, position iterators,
70 * expressions, range variables, template parameters but notably continues
71 * to delegate global caches.
73 * @author Frans Englich <frans.englich@nokia.com>
75 template<typename TSuperClass>
76 class StackContextBase : public TSuperClass
81 * Construct a StackContextBase and passes @p prevContext to its super class. This
82 * constructor is typically used when the super class is DelegatingDynamicContext.
84 StackContextBase(const DynamicContext::Ptr &prevContext);
86 virtual void setRangeVariable(const VariableSlotID slotNumber,
87 const Item &newValue);
88 virtual Item rangeVariable(const VariableSlotID slotNumber) const;
90 virtual void setExpressionVariable(const VariableSlotID slotNumber,
91 const Expression::Ptr &newValue);
92 virtual Expression::Ptr expressionVariable(const VariableSlotID slotNumber) const;
94 virtual Item::Iterator::Ptr positionIterator(const VariableSlotID slot) const;
95 virtual void setPositionIterator(const VariableSlotID slot,
96 const Item::Iterator::Ptr &newValue);
97 virtual ItemCacheCell &itemCacheCell(const VariableSlotID slot);
98 virtual ItemSequenceCacheCell::Vector &itemSequenceCacheCells(const VariableSlotID slot);
100 virtual DynamicContext::TemplateParameterHash &templateParameterStore();
104 * This function is protected, although it only is used in this class. I don't
105 * know why it has to be, but it won't compile when private.
107 template<typename VectorType, typename UnitType>
109 void setSlotVariable(const VariableSlotID slot,
110 const UnitType &newValue,
111 VectorType &container) const;
114 Item::Vector m_rangeVariables;
115 Expression::Vector m_expressionVariables;
116 Item::Iterator::Vector m_positionIterators;
117 ItemCacheCell::Vector m_itemCacheCells;
118 ItemSequenceCacheCell::Vector m_itemSequenceCacheCells;
119 DynamicContext::TemplateParameterHash m_templateParameterStore;
122 #include "qstackcontextbase_tpl_p.h"
125 * @short A DynamicContext that creates a new scope for variables.
127 * This DynamicContext is used for recursive user function calls, for example.
129 typedef StackContextBase<DelegatingDynamicContext> StackContext;