xpathnode.h

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// © Copyright 2010 - 2016 BlackTopp Studios Inc.
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/*
 *
 * Software, Files, Libraries and all other items referenced in this clause refers only
 * to the contents of this file and associated documentation.
 *
 * Pugixml parser - version 1.0
 * --------------------------------------------------------
 * Copyright © 2006-2012, by Arseny Kapoulkine (arseny.kapoulkine@gmail.com)
 * Report bugs and download new versions at http://pugixml.org/
 *
 * This library is distributed under the MIT License. See notice at the end
 * of this file.
 *
 * This work is based on the pugxml parser, which is:
 * Copyright © 2003, by Kristen Wegner (kristen@tima.net)
 */
#ifndef _xmlxpathnode_h
#define _xmlxpathnode_h

/// @file
/// @brief The definition of the @ref Mezzanine::XML::XPathNode
#include "datatypes.h"
#include "XML/node.h"



namespace Mezzanine
{
    namespace XML
    {
        /// @brief An XPath node which can store handles to a XML::Node or an XML::Attribute.
        /// @details Because an XPath node can be either a XML::Node or an XML::Attribute, there is a special type, XPathNode,
        /// which is a discriminated union of these types. A value of this type contains two node handles, one of XML::Node type,
        /// and another one of XML::Attribute type; at most one of them can be non-null. The accessors to get these handles are
        /// available: XPathNode::GetNode() an XPathNode::GetAttribute() . \n \n
        /// XPath nodes can be null, in which case both accessors return null handles.
        class MEZZ_LIB XPathNode
        {
            private:
                /// @internal
                /// @brief The node this refers to.
                Node TargetNode;

                /// @internal
                /// @brief The node if any that this targets.
                Attribute _attribute;

                #ifndef SWIG
                /// @brief Used to convert this to a boolean value in a safe way
                /// @return Returns true if the internal data is set and false otherwise.
                /// @note Not available in scripting languages.
                typedef void (*unspecified_bool_type)(XPathNode***);
                #endif

            public:
                /// @brief Default constructor; constructs empty XPath node
                XPathNode();

                /// @brief Construct From a XML::Node.
                /// @param node The XML::Node this handle should reference.
                XPathNode(const Node& node);

                /// @brief Construct From a XML::Attribute.
                /// @param GetAttribute The XML::Attribute this handle should reference.
                /// @param GetParent The XML::Node the XML::Attribute is on.
                XPathNode(const Attribute& GetAttribute, const Node& GetParent);

                /// @brief Get the XML::Node this is referencing
                /// @return A valid XML::Node, or a null node if this doesn't reference a an XML::Node.
                Node GetNode() const;

                /// @brief Get the XML::Attribute this is referencing
                /// @return A valid XML::Attribute, or a null node if this doesn't reference a an XML::Attribute.
                Attribute GetAttribute() const;

                /// @brief Get the parent of the XML::Node or XML::Attribute this refers to.
                /// @return A valid XML::Node, or a null node if this doesn't reference a an XML::Node.
                Node GetParent() const;

                #ifndef SWIG
                /// @brief Used to convert this to a boolean value in a safe way
                /// @return Returns true if the internal data is set and false otherwise.
                /// @note Not available in scripting languages.
                operator unspecified_bool_type() const;
                #endif

                /// @brief Logical not operator, used a workaround for borland compiler.
                /// @return A bool that is the opposite of evaluatig this as a bool normally.
                bool operator!() const;

                // Comparison operators
                /// @brief Called when comparing two XPathNode instances for equality.
                /// @param n The other XML::XPathNode to compare this Node against for equality.
                /// @return True if this and the other XML::XPathNode are referencing the same item, false otherwise;
                bool operator==(const XPathNode& n) const;

                /// @brief Called when comparing two XPathNode instances for inequality.
                /// @param n The other XML::XPathNode to compare this Node against for inequality.
                /// @return True if this and the other XML::XPathNode are referencing the same item, false otherwise;
                bool operator!=(const XPathNode& n) const;
        };
    }
} // /namespace Mezzanine



#endif // Include guard


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