variantquery.h

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#pragma once
 
 
#include <promeki/config.h>
#if PROMEKI_ENABLE_CORE
#include <functional>
#include <optional>
#include <promeki/optional.h>
#include <promeki/function.h>
#include <promeki/namespace.h>
#include <promeki/string.h>
#include <promeki/error.h>
#include <promeki/result.h>
#include <promeki/uniqueptr.h>
#include <promeki/variant.h>
#include <promeki/variantspec.h>
#include <promeki/variantlookup.h>
 
PROMEKI_NAMESPACE_BEGIN
 
class Frame;
 
namespace detail {
 
        class VariantQueryNode;
 
        using VariantQueryNodeUPtr = UniquePtr<VariantQueryNode>;
 
        struct VariantQueryContext {
                        Function<Optional<Variant>(const String &)> resolve;
 
                        Function<const VariantSpec *(const String &)> specFor;
        };
 
        VariantQueryNodeUPtr parseVariantQueryExpr(const String &expr, String &errorDetail);
 
        bool evalVariantQuery(const VariantQueryNode *root, const VariantQueryContext &ctx);
 
} // namespace detail
 
template <typename T> class VariantQuery {
        public:
                static Result<VariantQuery<T>> parse(const String &expr);
 
                VariantQuery();
                ~VariantQuery();
 
                VariantQuery(const VariantQuery &) = delete;
                VariantQuery &operator=(const VariantQuery &) = delete;
                VariantQuery(VariantQuery &&) noexcept;
                VariantQuery &operator=(VariantQuery &&) noexcept;
 
                bool isValid() const;
 
                bool match(const T &instance) const;
 
                const String &source() const;
 
                const String &errorDetail() const;
 
        private:
                VariantQuery(String source, detail::VariantQueryNodeUPtr root);
 
                String                       _source;
                String                       _errorDetail;
                detail::VariantQueryNodeUPtr _root;
};
 
extern template class VariantQuery<Frame>;
 
PROMEKI_NAMESPACE_END
 
#endif // PROMEKI_ENABLE_CORE