Major plugin refactor and cleanup.

Switched to POCO library for unified platform/library interface.
Deprecated the external module API. It was creating more problems than solving.
Removed most built-in libraries in favor of system libraries for easier maintenance.
Cleaned and secured code with help from static analyzers.

vendor/POCO/XML/include/Poco/DOM/Attr.h

@@ -0,0 +1,180 @@
+//
+// Attr.h
+//
+// Library: XML
+// Package: DOM
+// Module:  DOM
+//
+// Definition of the DOM Attr class.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef DOM_Attr_INCLUDED
+#define DOM_Attr_INCLUDED
+
+
+#include "Poco/XML/XML.h"
+#include "Poco/DOM/AbstractNode.h"
+#include "Poco/DOM/Element.h"
+#include "Poco/XML/Name.h"
+
+
+namespace Poco {
+namespace XML {
+
+
+class XML_API Attr: public AbstractNode
+	/// The Attr interface represents an attribute in an Element object. Typically
+	/// the allowable values for the attribute are defined in a document type definition.
+	/// 
+	/// Attr objects inherit the Node interface, but since they are not actually
+	/// child nodes of the element they describe, the DOM does not consider them
+	/// part of the document tree. Thus, the Node attributes parentNode, previousSibling,
+	/// and nextSibling have a null value for Attr objects. The DOM takes the view
+	/// that attributes are properties of elements rather than having a separate
+	/// identity from the elements they are associated with; this should make it
+	/// more efficient to implement such features as default attributes associated
+	/// with all elements of a given type. Furthermore, Attr nodes may not be immediate
+	/// children of a DocumentFragment. However, they can be associated with Element
+	/// nodes contained within a DocumentFragment. In short, users and implementors
+	/// of the DOM need to be aware that Attr nodes have some things in common with
+	/// other objects inheriting the Node interface, but they also are quite distinct.
+	/// 
+	/// The attribute's effective value is determined as follows: if this attribute
+	/// has been explicitly assigned any value, that value is the attribute's effective
+	/// value; otherwise, if there is a declaration for this attribute, and that
+	/// declaration includes a default value, then that default value is the attribute's
+	/// effective value; otherwise, the attribute does not exist on this element
+	/// in the structure model until it has been explicitly added. Note that the
+	/// nodeValue attribute on the Attr instance can also be used to retrieve the
+	/// string version of the attribute's value(s).
+	/// 
+	/// In XML, where the value of an attribute can contain entity references, the
+	/// child nodes of the Attr node provide a representation in which entity references
+	/// are not expanded. These child nodes may be either Text or EntityReference
+	/// nodes. Because the attribute type may be unknown, there are no tokenized
+	/// attribute values.
+{
+public:
+	const XMLString& name() const;
+		/// Returns the name of this attribute.
+
+	bool specified() const;
+		/// If this attribute was explicitly given a value in the original document,
+		/// this is true; otherwise, it is false. Note that the implementation is in
+		/// charge of this attribute, not the user. If the user changes the value of
+		/// the attribute (even if it ends up having the same value as the default value)
+		/// then the specified flag is automatically flipped to true. To re-specify
+		/// the attribute as the default value from the DTD, the user must delete the
+		/// attribute. The implementation will then make a new attribute available with
+		/// specified set to false and the default value (if one exists).
+		/// In summary:
+		/// 
+		///     * If the attribute has an assigned value in the document then specified
+		///       is true, and the value is the assigned value.
+		///     * If the attribute has no assigned value in the document and has a default
+		///       value in the DTD, then specified is false, and the value is the default
+		///       value in the DTD.
+		///     * If the attribute has no assigned value in the document and has a value
+		///       of #IMPLIED in the DTD, then the attribute does not appear in the structure
+		///       model of the document.
+		///     * If the attribute is not associated to any element (i.e. because it
+		///       was just created or was obtained from some removal or cloning operation)
+		///       specified is true.
+
+	const XMLString& value() const;
+		/// Returns the value of the attribute as a string. Character
+		/// and general entity references are replaced with their values. See also the
+		/// method getAttribute on the Element interface.
+
+	const XMLString& getValue() const;
+		/// Returns the value of the attribute as a string. Character
+		/// and general entity references are replaced with their values. See also the
+		/// method getAttribute on the Element interface.
+
+	void setValue(const XMLString& value);
+		/// Sets the value of the attribute as a string.
+		/// This creates a Text node with the unparsed contents of the string.
+		/// I.e. any characters that an XML processor would recognize as markup are
+		/// instead treated as literal text. See also the method setAttribute on the
+		/// Element interface.
+
+	// DOM Level 2
+	Element* ownerElement() const;
+		/// The Element node this attribute is attached to or null 
+		/// if this attribute is not in use.
+
+	// Node
+	Node* parentNode() const;
+	const XMLString& nodeName() const;
+	const XMLString& getNodeValue() const;
+	void setNodeValue(const XMLString& value);
+	unsigned short nodeType() const;
+	Node* previousSibling() const;
+	const XMLString& namespaceURI() const;
+	XMLString prefix() const;
+	const XMLString& localName() const;
+
+	// Non-standard extensions
+	XMLString innerText() const;
+
+protected:
+	Attr(Document* pOwnerDocument, Element* pOwnerElement, const XMLString& namespaceURI, const XMLString& localName, const XMLString& qname, const XMLString& value, bool specified = true);
+	Attr(Document* pOwnerDocument, const Attr& attr);
+	~Attr();
+	
+	Node* copyNode(bool deep, Document* pOwnerDocument) const;
+
+private:
+	const Name& _name;
+	XMLString   _value;
+	bool        _specified;
+
+	friend class Document;
+	friend class Element;
+	friend class DOMBuilder;
+};
+
+
+//
+// inlines
+//
+inline const XMLString& Attr::name() const
+{
+	return _name.qname();
+}
+
+
+inline const XMLString& Attr::value() const
+{
+	return _value;
+}
+
+
+inline const XMLString& Attr::getValue() const
+{
+	return _value;
+}
+
+
+inline bool Attr::specified() const
+{
+	return _specified;
+}
+
+
+inline Element* Attr::ownerElement() const
+{
+	return static_cast<Element*>(_pParent);
+}
+
+
+} } // namespace Poco::XML
+
+
+#endif // DOM_Attr_INCLUDED