node.h

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// © Copyright 2010 - 2016 BlackTopp Studios Inc.
/* This file is part of The Mezzanine Engine.

    The Mezzanine Engine is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with The Mezzanine Engine.  If not, see <http://www.gnu.org/licenses/>.
*/
/* The original authors have included a copy of the license specified above in the
   'Docs' folder. See 'gpl.txt'
*/
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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 _xmlnode_h
#define _xmlnode_h

/// @file
/// @brief This defines the @ref Mezzanine::XML::Node one of the central XML classes.

#include "datatypes.h"
#include "XML/xmlenumerations.h"
#include "XML/attribute.h"
#include "XML/objectrange.h"



namespace Mezzanine
{
    namespace XML
    {
        class NodeStruct;
        class NodeText;
        class TreeWalker;
        class XPathNode;
        class XPathNodeSet;
        class XPathVariableSet;
        class XPathQuery;
        class Writer;
        class NodeIterator;
        class AttributeIterator;
        class NamedNodeIterator;



        /// @brief A light-weight handle for manipulating nodes in DOM tree.
        class MEZZ_LIB Node
        {
                friend class AttributeIterator;
                friend class NodeIterator;
                friend class NamedNodeIterator;

            protected:
                /// @internal
                /// @brief Stores pointers to the Node data and some metadata.
                NodeStruct* NodeData;

                #ifndef SWIG
                /// @brief Used to prevent casting to numerical types acccidentally.
                /// @note Not available in scripting languages because conversion is handled on a per langauge basis.
                typedef void (*unspecified_bool_type)(Node***);
                #endif

            public:
                /// @brief Default constructor. Constructs an empty node.
                Node();

                /// @brief Virtual deconstructor.
                ~Node();

                /// @brief Constructs node from internal pointer
                /// @param p An internal node pointer.
                explicit Node(NodeStruct* p);

                #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 because conversion is handled on a per langauge basis.
                operator unspecified_bool_type() const;
                #endif

                /// @brief Used to convert this node the opposite of it's normal boolean value
                /// @details This is described in the PugiXML source a a workaround for a borland c++ issue.
                /// @return Returns false if the internal pointer NodeStruct is set and true otherwise.
                bool operator!() const;

#if !(defined(SWIG) && defined(MEZZLUA51)) // Stop Swig from making lua bindings but allow other languages
                /// @brief Compares the internal values to check equality.
                /// @param r The other @ref Node this is being compared to.
                /// @details Many of the internal values are pointers, and it is the addresses of these that are being compared.
                /// @return Returns true if all the internal values match between this and the other Node.
                /// @note Not available in scripting languages
                bool operator==(const Node& r) const;
#endif

                /// @brief Compares the internal values to check inequality.
                /// @param r The other @ref Node this is being compared to.
                /// @details Many of the internal values are pointers, and it is the addresses of these that are being compared.
                /// @return Returns true if any of the internal values don't match between this and the other @ref Node.
                bool operator!=(const Node& r) const;

                /// @brief Compares the internal values to check for lessthanness.
                /// @param r The other @ref Node this is being compared to.
                /// @details Many of the internal values are pointers, and it is the addresses of these that are being compared.
                /// @return Returns True if the other @ref Node is greater than this one as per sequential comparison of internal pointers.
                bool operator<(const Node& r) const;

                /// @brief Compares the internal values to check for greaterthanness.
                /// @param r The other @ref Node this is being compared to.
                /// @details Many of the internal values are pointers, and it is the addresses of these that are being compared.
                /// @return Returns True if the other @ref Node is less than this one as per sequential comparison of internal pointers.
                bool operator>(const Node& r) const;

                /// @brief Compares the internal values to check for inequality and lessthanness.
                /// @param r The other @ref Node this is being compared to.
                /// @details Many of the internal values are pointers, and it is the addresses of these that are being compared.
                /// @return Returns True if the other @ref Node is greater than or equal to this one as per sequential comparison of internal pointers.
                bool operator<=(const Node& r) const;

                /// @brief Compares the internal values to check for inequality and greaterthanness.
                /// @param r The other @ref Node this is being compared to.
                /// @details Many of the internal values are pointers, and it is the addresses of these that are being compared.
                /// @return Returns True if the other @ref Node is less than or equal to this one as per sequential comparison of internal pointers.
                bool operator>=(const Node& r) const;

                /// @brief Is this storing anything at all?
                /// @return Returns True if this @ref Node is storing nothing. False if it is storing anything.
                bool Empty() const;

                /// @brief Identify what kind of Node this is.
                /// @return A @ref NodeType identifying this Node, or o/NULL if this Node is empty.
                NodeType Type() const;

                /// @brief ptrdiff_tGet the name of this @ref Node.
                /// @return Returns A pointer to a const c-style array of the the character type (usually char or wchar_t) containing the name.
                /// @warning returns "" if Node is empty.
                const Char8* Name() const;

                /// @brief Get the Value of this @ref Node.
                /// @return Returns A pointer to a const c-style array of the the character type (usually char or wchar_t) containing the value.
                /// @warning returns "" if Node is empty.
                const Char8* Value() const;

                /// @brief Get the First Attribute in this Node.
                /// @return This attempts to return the First @ref Attribute in this node, if it cannot it returns an empty @ref Attribute.
                Attribute GetFirstAttribute() const;

                /// @brief Get the Last Attribute in this Node.
                /// @return This attempts to return the Last @ref Attribute in this node, if it cannot it returns an empty @ref Attribute.
                Attribute GetLastAttribute() const;

                /// @brief Get the first child Node of this Node.
                /// @return Returns the First child node if it exists, otherwise it return an empty node.
                Node GetFirstChild() const;

                /// @brief Get the last child Node of this Node.
                /// @return Returns the last child node if it exists, otherwise it return an empty node.
                Node GetLastChild() const;

                /// @brief Attempt to retrieve the next sibling of this Node.
                /// @details A sibling of a Node is another Node that shares the same parent. If this is and the sibling nodes are valid, this retrieves that Node, otherwise this return an empty Node.
                /// @return A Node that represents a sibling, or an empty Node on failure.
                Node GetNextSibling() const;

                /// @brief Attempt to retrieve the prvious sibling of this Node.
                /// @details A sibling of a Node is another Node that shares the same parent. If this is and the sibling nodes are valid, this retrieves that Node, otherwise this return an empty Node.
                /// @return A Node that represents a sibling, or an empty Node on failure.
                Node GetPreviousSibling() const;

                /// @brief Attempt to retrieve the parent of this Node.
                /// @return A Node that represents the parent Node, or an empty Node on failure.
                Node GetParent() const;

                /// @brief Attempt to retrieve the root Node, or the most base Node containing this Node.
                /// @return A Node that represents the root of the XML document, or an empty Node on failure. If there are multiple roots this attempts to retrieve the appropriate one.
                Node GetRoot() const;

                /// @brief Get text object for the current node
                /// @return An @ref Mezzanine::XML::NodeText which represents the PCData of this node.
                NodeText GetText() const;

#if !(defined(SWIG) && defined(MEZZLUA51)) // Stop Swig from making lua bindings but allow other languages
                /// @brief Attempt to get a child Node with a given name.
                /// @param Name The name of the desired child Node.
                /// @return A Node that represents the first desired child, or an empty Node on failure.
                /// @note Not available in scripting languages in favor of the overload of this function that accepts String as a parameter.
                Node GetChild(const Char8* Name) const;
#endif

                /// @brief Attempt to get a child Node with a given name.
                /// @param Name The name of the desired child Node.
                /// @return A Node that represents the first desired child, or an empty Node on failure.
                Node GetChild(const String& Name) const
                    { return GetChild(Name.c_str()); }

                /// @brief Attempt to get an Attribute on this Node with a given name.
                /// @param Name The name of the desired Attribute.
                /// @return An Attribute that represents the first matching Attribute, or an empty Attribute on failure.
                Attribute GetAttribute(const Char8* Name) const;

                /// @brief Like @ref GetNextSibling except that the return will be a null Node or have a matching name.
                /// @param Name if possible this will return the next sibling with this name.
                /// @return The next sibling with a matching name, or a null/empty node.
                Node GetNextSibling(const Char8* Name) const;

                /// @brief Like @ref GetPreviousSibling except that the return will be a null Node or have a matching name.
                /// @param Name if possible this will return the previous sibling with this name.
                /// @return The previous sibling with a matching name, or a null/empty node.
                Node GetPreviousSibling(const Char8* Name) const;

                /// @brief Retrieve the value of this(or a child's) Nodes PCDATA child Node
                /// @details If this node represents "<node>Some text in the PCDATA field, that is actually represent by a node</node>", then this would return "Some text in the PCDATA field, that is actually represent by a node". This will iterate through child Nodes from until it finds a PCDATA node or fails
                /// @return This will return the Value of the first available PCDATA node.
                const Char8* GetChildValue() const;

                /// @brief Get the PCDATA of a given child. The same a calling "GetChild(Name).ChildValue()".
                /// @param Name The Name of the desired child node.
                /// @return This will return the Value of the first available matching PCDATA node.
                const Char8* GetChildValue(const Char8* Name) const;

                #ifndef SWIG
                /// @brief Set the name of .
                /// @param rhs The desired name.
                /// @return True if successful, returns false if the name cannot be stored or there is not enough memory.
                /// @note Not available in scripting languages in favor of the overload of this function that accepts String as a parameter.
                bool SetName(const Char8* rhs);
                #endif

                /// @brief Set the name of this object
                /// @param rhs The desired name .
                /// @return True if successful, returns false if the name cannot be stored or there is not enough memory.
                bool SetName(const String& rhs)
                    { return SetName(rhs.c_str()); }

                /// @brief Set the value of this.
                /// @param rhs The new Value.
                /// @return True if successful, returns false if this is empty or there is not enough memory.
                /// @todo update this to make the error return code redundant and use an exception instead.
                /// @todo Review for possiblity of buffer overflow.
                bool SetValue(const Char8* rhs);

#if !(defined(SWIG) && defined(MEZZLUA51)) // Stop Swig from making lua bindings but allow other languages
                /// @brief Creates an Attribute and puts it at the end of this Nodes attributes.
                /// @param Name The name of the New attribute to be created
                /// @details This attempts to create an Attribute and stick it at the end of the list of attribute on the current
                /// Node. This will fail and return an Empty Attribute if this Node is neither an Element nor a Declaration. This will
                /// fail and return an empty attribute if this Node is empty.
                /// @return The created Attribute or an empty Attribute on Failure.
                /// @note Not available in scripting languages in favor of the overload of this function that accepts String as a parameter.
                Attribute AppendAttribute(const Char8* Name);
#endif

                /// @brief Creates an Attribute and puts it at the end of this Nodes attributes.
                /// @param Name The name of the New attribute to be created
                /// @return The created Attribute or an empty Attribute on Failure.
                Attribute AppendAttribute(const String& Name)
                    { return AppendAttribute(Name.c_str()); }

                /// @brief Creates an Attribute and puts it at the begining of this Nodes attributes
                /// @param Name The name of the New attribute to be created
                /// @details This attempts to create an Attribute and stick it at the beginning of the list of attributes on the current
                /// Node. This will fail and return an Empty Attribute if this Node is neither an Element nor a Declaration. This will
                /// fail and return an empty attribute if this Node is empty.
                /// @return The created Attribute or an empty Attribute on Failure.
                Attribute PrependAttribute(const Char8* Name);

                /// @brief Creates an Attribute and puts it into the list of this Nodes attributes.
                /// @param Name The name of the New attribute to be created
                /// @param attr An Attribute that represents an Attribute on this Node, and is just before where you want the new Attribute.
                /// @details This attempts to create an Attribute and stick it in the list of attributes, Just after another Attribute, on the current
                /// Node. This will fail and return an Empty Attribute if this Node is neither an Element nor a Declaration. This will
                /// fail and return an empty attribute if this Node is empty.
                /// @return The created Attribute or an empty Attribute on Failure.
                Attribute InsertAttributeAfter(const Char8* Name, const Attribute& attr);

                /// @brief Creates an Attribute and puts it into the list of this Nodes attributes.
                /// @param Name The name of the New attribute to be created
                /// @param attr An Attribute that represents an Attribute on this Node, and is just after where you want the new Attribute.
                /// @details This attempts to create an Attribute and stick it in the list of attributes, Just before another Attribute, on the current
                /// Node. This will fail and return an Empty Attribute if this Node is neither an Element nor a Declaration. This will
                /// fail and return an empty attribute if this Node is empty.
                /// @return The created Attribute or an empty Attribute on Failure.
                Attribute InsertAttributeBefore(const Char8* Name, const Attribute& attr);

                /// @brief Copies an Attribute and puts the copy at the end of this Nodes attributes.
                /// @param proto The attribute to be copied.
                /// @details This attempts to create a copy of an attribute Attribute and stick it at the end of the list of attribute on the current
                /// Node. This will fail and return an Empty Attribute if this Node is neither an Element nor a Declaration. This will
                /// fail and return an empty attribute if this Node is empty.
                /// @return The created Attribute or an empty Attribute on Failure.
                Attribute AppendCopy(const Attribute& proto);

                /// @brief Copies an Attribute and puts the copy at the beginning of this Nodes attributes.
                /// @param proto The attribute to be copied.
                /// @details This attempts to create a copy of an attribute Attribute and stick it at the beginning of the list of attribute on the current
                /// Node. Tptrdiff_this will fail and return an Empty Attribute if this Node is neither an Element nor a Declaration. This will
                /// fail and return an empty attribute if this Node is empty.
                /// @return The created Attribute or an empty Attribute on Failure.
                Attribute PrependCopy(const Attribute& proto);

                /// @brief Copies an Attribute and puts the copy into the list of this Nodes attributes.
                /// @param proto The attribute to be copied.
                /// @param attr An Attribute that represents an Attribute on this Node, and is just before where you want the new copy of proto.
                /// @details This attempts to create a copy of an attribute Attribute and stick it in the middle of the list of attributes, just after a selected attribute, on the current
                /// Node. This will fail and return an Empty Attribute if this Node is neither an Element nor a Declaration. This will
                /// fail and return an empty attribute if this Node is empty.
                /// @return The created Attribute or an empty Attribute on Failure.
                Attribute InsertCopyAfter(const Attribute& proto, const Attribute& attr);

                /// @brief Copies an Attribute and puts the copy into the list of this Nodes attributes.
                /// @param proto The attribute to be copied.
                /// @param attr An Attribute that represents an Attribute on this Node, and is just after where you want the new copy of proto.
                /// @details This attempts to create a copy of an attribute Attribute and stick it in the middle of the list of attributes, just before a selected attribute, on the current
                /// Node. This will fail and return an Empty Attribute if this Node is neither an Element nor a Declaration. This will
                /// fail and return an empty attribute if this Node is empty.
                /// @return The created Attribute or an empty Attribute on Failure.
                Attribute InsertCopyBefore(const Attribute& proto, const Attribute& attr);

                /// @brief Creates a Node and makes it a child of this one.
                /// @param Type The NodeType of the Node to be added to list of child Nodes.
                /// @return A Node representing the freshly added Node, or an empty Node if there was an error.
                Node AppendChild(NodeType Type = NodeElement);

                /// @brief Creates a Node and makes it a child of this one, and puts at the beginning of the Child Nodes.
                /// @param Type The NodeType of the Node to be added to the beginning list of child Nodes.
                /// @return A Node representing the freshly added Node, or an empty Node if there was an error.
                /// @todo Not all nodes can be added to other nodes, we need to figure it out and put it here.
                Node PrependChild(NodeType Type = NodeElement);

                /// @brief Creates a Node and makes it a child of this one, and puts at the middle of the Child Nodes.
                /// @param Type The NodeType of the Node to be added, just after another specific node.
                /// @param node The specific node to add the new one after.
                /// @todo Not all nodes can be added to other nodes, we need to figure it out and put it here.
                /// @return A Node representing the freshly added Node, or an empty Node if there was an error.
                Node InsertChildAfter(NodeType Type, const Node& node);

                /// @brief Creates a Node and makes it a child of this one, and puts at the middle of the Child Nodes.
                /// @param Type The NodeType of the Node to be added, just before another specific node.
                /// @param node The specific node to add the new one before.
                /// @return A Node representing the freshly added Node, or an empty Node if there was an error.
                /// @todo Not all nodes can be added to other nodes, we need to figure it out and put it here.
                Node InsertChildBefore(NodeType Type, const Node& node);

#if !(defined(SWIG) && defined(MEZZLUA51)) // Stop Swig from making lua bindings but allow other languages
                /// @brief Creates an element Node as a child of this Node, with the given name.
                /// @param Name The name of the Node to be created.
                /// @details Calls @ref Node::AppendChild(NodeType); using NodeElement as the NodeType.
                /// @return The desired Node on success, an empty Node on failure.
                /// @note Not available in scripting languages in favor of the overload of this function that accepts String as a parameter.
                Node AppendChild(const Char8* Name);
#endif

                /// @brief Creates an element Node as a child of this Node, with the given name.
                /// @param Name The name of the Node to be created.
                /// @details Calls @ref Node::AppendChild
                /// @return The desired Node on success, an empty Node on failure.
                Node AppendChild(const String& Name)
                    { return AppendChild(Name.c_str()); }

#if !(defined(SWIG) && defined(MEZZLUA51)) // Stop Swig from making lua bindings but allow other languages
                /// @brief Creates an element Node as a child of this Node, with the given name at the beginning of the children
                /// @param Name The name of the Node to be created.
                /// @details Calls @ref Node::PrependChild(NodeType); using NodeElement as the NodeType.
                /// @return The desired Node on success, an empty Node on failure.
                /// @note Not available in scripting languages in favor of the overload of this function that accepts String as a parameter.
                Node PrependChild(const Char8* Name);
#endif

                /// @brief Creates an element Node as a child of this Node, with the given name at the beginning of the children
                /// @param Name The name of the Node to be created.
                /// @details Calls @ref Node::PrependChild
                /// @return The desired Node on success, an empty Node on failure.
                Node PrependChild(const String& Name)
                    { return PrependChild(Name.c_str()); }

                /// @brief Creates an element Node as a child of this Node, with the given name at the middle of the children
                /// @param Name The name of the Node to be created.
                /// @param node The node just before were the Create node is to be placed.
                /// @details Calls Node::InsertChildAfter(NodeType, Node); using NodeElement as the NodeType.
                /// @return The desired Node on success, an empty Node on failure.
                Node InsertChildAfter(const Char8* Name, const Node& node);

                /// @brief Creates an element Node as a child of this Node, with the given name at the middle of the children
                /// @param Name The name of the Node to be created.
                /// @param node The node just after were the Create node is to be placed.
                /// @details Calls Node::InsertChildBefore(NodeType, Node); using NodeElement as the NodeType.
                /// @return The desired Node on success, an empty Node on failure.
                Node InsertChildBefore(const Char8* Name, const Node& node);

                /// @brief Copies a Node and puts the copy at the end of the list of this Nodes Childrem.
                /// @param proto The Node to be copied. If this is emptry, no work is performed.
                /// @return The copied Node on success, an empty Node on failure.
                Node AppendCopy(const Node& proto);

                /// @brief Copies a Node and puts the copy at the start of the list of this Nodes Childrem.
                /// @param proto The Node to be copied. If this is emptry, no work is performed.
                /// @return The copied Node on success, an empty Node on failure.
                Node PrependCopy(const Node& proto);

                /// @brief Copies a Node and puts the copy in the middle the list of this Nodes Childrem.
                /// @param proto The Node to be copied. If this is emptry, no work is performed.
                /// @param node The Node just before the desired place in the list of children to insert the copied node.
                /// @return The copied Node on success, an empty Node on failure.
                Node InsertCopyAfter(const Node& proto, const Node& node);

                /// @brief Copies a Node and puts the copy in the middle the list of this Nodes Childrem.
                /// @param proto The Node to be copied. If this is emptry, no work is performed.
                /// @param node The Node just after the desired place in the list of children to insert the copied node.
                /// @return The copied Node on success, an empty Node on failure.
                Node InsertCopyBefore(const Node& proto, const Node& node);

                /// @brief Remove specified Attribute.
                /// @param a The Attribute to look for. If the given Attribute doesn't belong to this Node then this will fail
                /// @return True if the removal was successful, false otherwise.
                bool RemoveAttribute(const Attribute& a);

                /// @brief Remove Attribute as specified by name.
                /// @param Name The name of the Attribute to remove.
                /// @return True if the removal was successful, false otherwise.
                bool RemoveAttribute(const Char8* Name);

                /// @brief Remove specified child element.
                /// @param n The Node to look for. If the given Attribute doesn't belong to this Node then this will fail
                /// @return True if the removal was successful, false otherwise.
                bool RemoveChild(const Node& n);

                /// @brief Remove child element as specified by name.
                /// @param Name The name of the Node to remove.
                /// @return True if the removal was successful, false otherwise
                bool RemoveChild(const Char8* Name);

                /// @brief Search for an Attribute using a function to check each Attribute individually.
                /// @param pred a pointer to a function that accepts an Attribute, and returns bool.
                /// @details This iterates through each Attribute on this node, from begining to end and calls the Predicate function passing
                /// an Attribute to it. If the Predicate returns true the Node it was just passed is returned. If Precdicate never returns
                /// true, it is called on every Node and a blank Node is returned. The Predicate is never called with a null value.
                /// @return This returns the first Attribute that causes Predicate to return true.
                template <typename Predicate> Attribute FindAttribute(Predicate pred) const
                {
                    if (!NodeData) return Attribute();

                    for (Attribute attrib = GetFirstAttribute(); attrib; attrib = attrib.GetNextAttribute())
                        if (pred(attrib))
                            return attrib;

                    return Attribute();
                }


                /// @brief Search for an child ( only direct children ) Node using a function to check each Node individually.
                /// @param pred a pointer to a function that accepts an Node, and returns bool.
                /// @details This iterates through all immediate children of this Node and calls the Predicate function passing a Node to it. If
                /// the Predicate returns true the Node it was just passed is returned. If Predicate never returns true, it is called
                /// on every Node and a blank Node is returned. The Predicate is never called with a null value.
                /// @return This returns the first Node that causes Predicate to return true.
                template <typename Predicate> Node FindChild(Predicate pred) const
                {
                    if (!NodeData) return Node();

                    for (Node node = GetFirstChild(); node; node = node.GetNextSibling())
                        if (pred(node))
                            return node;

                    return Node();
                }

                /// @brief Search for any Node descended from this Node using a function to check each Node individually.
                /// @param pred a pointer to a function that accepts an Node, and returns bool.
                /// @details This iterates through all children of this Node, and their children ( and so on), and calls the Predicate function
                /// passing each Node to it. This iterates through all Nodes using a depth first algorithm. If the Predicate returns true the
                /// Node it was just passed is returned. If Predicate never returns true, it is called on every Node and a blank Node is
                /// returned. The Predicate is never called with a null value.
                /// @return This returns the first Node that causes Predicate to return true.
                template <typename Predicate> Node FindNode(Predicate pred) const
                {
                    if (!NodeData) return Node();

                    Node cur = GetFirstChild();
                    while (cur.NodeData && cur.NodeData != NodeData)
                    {
                        if (pred(cur)) return cur;

                        if (cur.GetFirstChild()) cur = cur.GetFirstChild();
                        else if (cur.GetNextSibling()) cur = cur.GetNextSibling();
                        else
                        {
                            while (!cur.GetNextSibling() && cur.NodeData != NodeData) cur = cur.GetParent();

                            if (cur.NodeData != NodeData) cur = cur.GetNextSibling();
                        }
                    }

                    return Node();
                }

                /// @brief Find a Node by an Attribute it has.
                /// @param Name The name of the matching Node.
                /// @param AttrName The name of the matching Attribute.
                /// @param AttrValue The value of the matching Attribute.
                /// @details Any Null pointers instead of character arrays passed in will cause undefined behavior. All Matching is Case sensitive.
                /// @return The First matching XML::Node
                Node FindChildbyAttribute(const Char8* Name, const Char8* AttrName, const Char8* AttrValue) const;

                /// @brief Find a Node by an Attribute it has.
                /// @param AttrName The name of the matching Attribute.
                /// @param AttrValue The value of the matching Attribute.
                /// @details Any Null pointers instead of character arrays passed in will cause undefined behavior. All Matching is Case sensitive.
                /// @return The First matching XML::Node
                Node FindChildbyAttribute(const Char8* AttrName, const Char8* AttrValue) const;

                /// @brief Get the absolute path to this Node
                /// @param delimiter The character to use as a pathname separator, this defaults to '/'.
                /// @return A String containing an path
                String Path(Char8 delimiter = '/') const;

                /// @brief Search for a node by Path consisting of node names and . or .. elements.
                /// @todo Investigate this more deeply.
                /// @param Path The path to search for.
                /// @param delimiter The character to use as a pathname separator, this defaults to '/'.
                /// @return The matching Node, of an empty Node on failure.
                Node FirstElementByPath(const Char8* Path, Char8 delimiter = '/') const;

                /// @brief Perform sophisticated (or whatever) algorithms on this and all descendant Nodes in the XML tree.
                /// @param walker Any class that fully implement XML::Treewalker. This is where the algorithm to be run is located.
                /// @return True if every descendant Node of this Node was iterated through, false if it didn't go through every Node.
                /// @see XML::TreeWalker
                bool Traverse(TreeWalker& walker);

                /// @brief Select single node by evaluating an XPath query. Returns first node from the resulting node set.
                /// @param query The XPath query as a c-string to be evaluated.
                /// @param variables undocumented.
                /// @return XPathNode The first matching XPath node.
                XPathNode FindSingleNode(const Char8* query, XPathVariableSet* variables = 0) const;

                /// @brief Select single node by evaluating an XPath query. Returns first node from the resulting node set.
                /// @param query The XPath query XPathQuery class instance.
                /// @return XPathNode The first matching XPath node.
                XPathNode FindSingleNode(const XPathQuery& query) const;

                /// @brief Select a group of nodes by evaluating an XPath query.
                /// @param query The XPath query as a c-string to be evaluated.
                /// @param variables undocumented.
                /// @return An XPathNodeSet with the Matchs of the XPath query.
                XPathNodeSet FindNodes(const Char8* query, XPathVariableSet* variables = 0) const;

                /// @brief Select a group of nodes by evaluating an XPath query.
                /// @param query The XPath query XPathQuery class instance.
                /// @return An XPathNodeSet with the Matchs of the XPath query.
                /// @param query The XPath query XPathQuery class instance.
                XPathNodeSet FindNodes(const XPathQuery& query) const;

                #ifndef SWIG_SAFE
                /// @brief Output the XML document using a Writer.
                /// @param WriterInstance The Writer that will be used to output the xml text.
                /// @param indent The Character(s) used to represent a tab in the output, this defaults to one tab character.
                /// @param flags The output format flags, this is a bitfield that defaults to XML::FormatDefault.
                /// @param DocumentEncoding The XML::Encoding of the document, whichs defaults to EncodingAuto
                /// @param Depth This defaults to 0. The amount of times to prepend the indentation to the beginning of each output line.
                /// @details This will never write a Byte Order Mark(BOM), and will default to not outputing a document declaration.
                /// @note This is not available in the safe libraries in scripting languages
                void Print(Writer& WriterInstance, const Char8* indent = "\t", unsigned int flags = FormatDefault, Encoding DocumentEncoding = EncodingAuto, unsigned int Depth = 0) const;

                /// @brief Output the XML document using a Output Stream.
                /// @param os An output stream to send xml text to.
                /// @param indent The Character(s) used to represent a tab in the outpput, this defaults to one tab character.
                /// @param flags The output format flags, this is a bitfield that defaults to XML::FormatDefault
                /// @param DocumentEncoding The XML::Encoding of the document, whichs defaults to EncodingAuto
                /// @param Depth This defaults to 0. The amount of times to prepend the indentation to the beginning of each output line.
                /// @details This will never write a Byte Order Mark(BOM), and will default to not outputing a document declaration.
                /// @note This is not available in the safe libraries in scripting languages
                void Print(std::basic_ostream<char, std::char_traits<char> >& os, const Char8* indent = "\t", unsigned int flags = FormatDefault, Encoding DocumentEncoding = EncodingAuto, unsigned int Depth = 0) const;

                /// @brief Output the XML document using a Output Stream.
                /// @param os An output stream to send xml text to.
                /// @param indent The Character(s) used to represent a tab in the outpput, this defaults to one tab character.
                /// @param flags The output format flags, this is a bitfield that defaults to XML::FormatDefault
                /// @param Depth This defaults to 0. The amount of times to prepend the indentation to the beginning of each output line.
                /// @details This will never write a Byte Order Mark(BOM), and will default to not outputing a document declaration.
                /// @note This is not available in the safe libraries in scripting languages
                void Print(std::basic_ostream<wchar_t, std::char_traits<wchar_t> >& os, const Char8* indent = "\t", unsigned int flags = FormatDefault, unsigned int Depth = 0) const;
                #endif //SWIG_SAFE

                /// @brief An iterator for child Nodes that will be easier for members of the std namespace to work with.
                typedef NodeIterator iterator;

                /// @brief Get a Child node iterator that references the first child Node.
                /// @return A Node::Iterator that reference the first child Node.
                iterator begin() const;

                /// @brief Get a Child node iterator that references one past the last child Node.
                /// @return A Node::Iterator that reference the last child Node.
                iterator end() const;

                /// @brief An iterator for Attribute members on this Node
                typedef AttributeIterator attribute_iterator;

                /// @brief Get an Attribute iterator that references the first Attribute on this Node.
                /// @return A Node::Iterator that reference the first child node.
                attribute_iterator attributes_begin() const;

                /// @brief Get an Attribute iterator that references the one past the last Attribute on this Node.
                /// @return A Node::Iterator that reference the last Attribute on this Node.
                attribute_iterator attributes_end() const;

                /// @brief Get an iterator range for this node's children nodes.
                /// @return The Begin and end iterators for a collection of all child nodes.
                ObjectRange<NodeIterator> GetChildren() const;

                /// @brief Get an iterator range for this a subset of this node's children nodes.
                /// @param Name All members of the returned range with have this for a name.
                /// @return A begin and end iterator for a range containing only the child nodes with the given name.
                ObjectRange<NamedNodeIterator> GetChildren(const Char8* Name) const;

                /// @brief A range of iterators for just the attributes of this node.
                /// @return A par of iterators suitable for traversing all Attributes directly as children of this noce.
                ObjectRange<AttributeIterator> attributes() const;

                /// @internal
                /// @brief Get node Offset in parsed file/string (in char_t units) for debugging purposes
                /// @return A ptrdiff_t containing how far into the document this node is.
                ptrdiff_t OffSetDebug() const;

                /// @internal
                /// @brief Get hash Value (unique for handles to the same object)
                /// @return A size_t that uniquely identifies this node.
                size_t HashValue() const;

                /// @internal
                /// @brief Get internal pointer
                /// @return A NodeStruct* that points to the internal data of this Node
                NodeStruct* InternalObject() const;
        }; // /Class Node
    }
} // /namespace Mezzanine



#endif // Include guard

/*
 *
 * Software, Files, Libraries and all other items referenced in this clause refers only
 * to the contents of this file and associated documentation.
 *
 * Copyright © 2006-2012 Arseny Kapoulkine
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

---

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