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| ** GNU General Public License Usage |
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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_ComparisonPlatform_H |
| #define Patternist_ComparisonPlatform_H |
| |
| #include "qatomiccomparators_p.h" |
| #include "qitem_p.h" |
| #include "qcommonsequencetypes_p.h" |
| #include "qdynamiccontext_p.h" |
| #include "qbuiltintypes_p.h" |
| #include "qitemtype_p.h" |
| #include "qpatternistlocale_p.h" |
| |
| QT_BEGIN_HEADER |
| |
| QT_BEGIN_NAMESPACE |
| |
| namespace QPatternist |
| { |
| /** |
| * @short Provides comparison functionality for classes that compare Items, |
| * such as ValueComparison or MaxFN. |
| * |
| * Classes which need comparison functionalities should inherit from this class. |
| * |
| * The parameter of this template class is the class inheriting from ComparisonPlatform. |
| * |
| * The class inheriting ComparisonPlatform must implement the following function: |
| * @code |
| * AtomicComparator::Operator operatorID() const |
| * @endcode |
| * |
| * @author Vincent Ricard <magic@magicninja.org> |
| * @ingroup Patternist_expressions |
| */ |
| template <typename TSubClass, |
| bool issueError, |
| AtomicComparator::ComparisonType comparisonType = AtomicComparator::AsValueComparison, |
| ReportContext::ErrorCode errorCode = ReportContext::XPTY0004> |
| class ComparisonPlatform |
| { |
| protected: |
| /** |
| * Makes ComparisonPlatform use the AtomicComparator @p comparator. |
| */ |
| void prepareComparison(const AtomicComparator::Ptr &comparator); |
| |
| /** |
| * Default constructor. Does nothing. It is implemented in order make template |
| * instantiation easier. |
| */ |
| inline ComparisonPlatform() |
| { |
| } |
| |
| /** |
| * Utility function for fetching the appropriate AtomicComparator |
| * for two atomic values of type @p type1 and @p type2, for the operator @p op. |
| * |
| * This function is used throughout the implementation, ranging from the ValueComparison |
| * itself, to for example the aggregate functions. |
| * |
| * @param context the ordinary ReportContext, used for issuing errors. |
| * @param type1 the type of the first operand value in a comparison for which the |
| * returned AtomicComparator is intended for |
| * @param type2 the type of the second operand value in a comparison for which the |
| * returned AtomicComparator is intended for. Whether @p type1 and @p type2 corresponds |
| * to what is the first second operand type does not have significance, the order |
| * can be arbitrary |
| */ |
| AtomicComparator::Ptr |
| fetchComparator(const ItemType::Ptr &type1, |
| const ItemType::Ptr &type2, |
| const ReportContext::Ptr &context) const; |
| |
| /** |
| * @short Compares @p i1 and @p i2 with operator @p op, using comparator @p |
| * comp. All input arguments must be valid, and not @c null. |
| * |
| * This is a fast, raw function which has the requirement that the |
| * caller knows what to compare and with what. |
| */ |
| bool compare(const Item &i1, |
| const Item &i2, |
| const AtomicComparator::Ptr &comp, |
| const AtomicComparator::Operator op) const; |
| |
| /** |
| * @short Compares @p it1 against @p it2, using comparator() and operatorID(). |
| * |
| * If the comparator wasn't looked up at compile time, it will be |
| * attempted before comparing. If this fails, errors are reported via |
| * @p context. |
| */ |
| bool |
| flexibleCompare(const Item &it1, |
| const Item &it2, |
| const DynamicContext::Ptr &context) const; |
| |
| /** |
| * @short like flexibleCompare(), but returns the result |
| * as an AtomicComparator::Operator instead of @c bool. |
| * |
| * This is useful when it is significant how a less than comparison |
| * fails; whether the two values are equal or greater than. |
| */ |
| AtomicComparator::ComparisonResult |
| detailedFlexibleCompare(const Item &it1, |
| const Item &it2, |
| const DynamicContext::Ptr &context) const; |
| |
| /** |
| * @returns the AtomicComparator that has been allocated at compile time, |
| * with prepareComparison(). If no AtomicComparator has been allocated |
| * for some reason, this function returns @c null. |
| */ |
| inline const AtomicComparator::Ptr &comparator() const |
| { |
| return m_comparator; |
| } |
| |
| /** |
| * Calling this function makes ComparisonPlatform use a comparator that |
| * compares strings case insensitively. |
| * |
| * @see ValueComparison::isCaseInsensitiveCompare() |
| */ |
| inline void useCaseInsensitiveComparator() |
| { |
| m_comparator = AtomicComparator::Ptr(new CaseInsensitiveStringComparator()); |
| } |
| |
| private: |
| /** |
| * @returns the operator that is used. |
| */ |
| inline AtomicComparator::Operator operatorID() const |
| { |
| Q_ASSERT(static_cast<const TSubClass *>(this)->operatorID()); |
| return static_cast<const TSubClass *>(this)->operatorID(); |
| } |
| |
| /** |
| * The comparator that is used for comparing atomic values. The AtomicComparator |
| * that is used, depends on the static type of the operands. m_comparator can be |
| * @c null if it wasn't possible to determine what comparator to use at compile time. |
| */ |
| AtomicComparator::Ptr m_comparator; |
| }; |
| |
| #include "qcomparisonplatform.cpp" |
| |
| } |
| |
| QT_END_NAMESPACE |
| |
| QT_END_HEADER |
| |
| #endif |