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