using System.Globalization; using System.Xml; namespace System.Configuration { internal static class HandlerBase { private static XmlNode GetAndRemoveAttribute(XmlNode node, string attrib, bool fRequired) { XmlNode xmlNode = node.Attributes.RemoveNamedItem(attrib); if (fRequired && xmlNode == null) throw new ConfigurationErrorsException(System.SR.Format(System.SR.Config_missing_required_attribute, attrib, node.Name), node); return xmlNode; } private static XmlNode GetAndRemoveStringAttributeInternal(XmlNode node, string attrib, bool fRequired, ref string val) { XmlNode andRemoveAttribute = GetAndRemoveAttribute(node, attrib, fRequired); if (andRemoveAttribute != null) val = andRemoveAttribute.Value; return andRemoveAttribute; } internal static XmlNode GetAndRemoveStringAttribute(XmlNode node, string attrib, ref string val) { return GetAndRemoveStringAttributeInternal(node, attrib, false, ref val); } private static XmlNode GetAndRemoveBooleanAttributeInternal(XmlNode node, string attrib, bool fRequired, ref bool val) { XmlNode andRemoveAttribute = GetAndRemoveAttribute(node, attrib, fRequired); if (andRemoveAttribute != null) try { val = bool.Parse(andRemoveAttribute.Value); return andRemoveAttribute; } catch (Exception inner) { throw new ConfigurationErrorsException(System.SR.Format(System.SR.Config_invalid_boolean_attribute, andRemoveAttribute.Name), inner, andRemoveAttribute); } return andRemoveAttribute; } internal static XmlNode GetAndRemoveBooleanAttribute(XmlNode node, string attrib, ref bool val) { return GetAndRemoveBooleanAttributeInternal(node, attrib, false, ref val); } private static XmlNode GetAndRemoveIntegerAttributeInternal(XmlNode node, string attrib, bool fRequired, ref int val) { XmlNode andRemoveAttribute = GetAndRemoveAttribute(node, attrib, fRequired); if (andRemoveAttribute != null) { if (!(andRemoveAttribute.Value.Trim() != andRemoveAttribute.Value)) try { val = int.Parse(andRemoveAttribute.Value, CultureInfo.InvariantCulture); return andRemoveAttribute; } catch (Exception inner) { throw new ConfigurationErrorsException(System.SR.Format(System.SR.Config_invalid_integer_attribute, andRemoveAttribute.Name), inner, andRemoveAttribute); } throw new ConfigurationErrorsException(System.SR.Format(System.SR.Config_invalid_integer_attribute, andRemoveAttribute.Name), andRemoveAttribute); } return andRemoveAttribute; } internal static XmlNode GetAndRemoveIntegerAttribute(XmlNode node, string attrib, ref int val) { return GetAndRemoveIntegerAttributeInternal(node, attrib, false, ref val); } internal static void CheckForUnrecognizedAttributes(XmlNode node) { if (node.Attributes.Count != 0) throw new ConfigurationErrorsException(System.SR.Format(System.SR.Config_base_unrecognized_attribute, node.Attributes[0].Name), node); } internal static string RemoveAttribute(XmlNode node, string name) { return node.Attributes.RemoveNamedItem(name)?.Value; } internal static string RemoveRequiredAttribute(XmlNode node, string name) { return RemoveRequiredAttribute(node, name, false); } internal static string RemoveRequiredAttribute(XmlNode node, string name, bool allowEmpty) { XmlNode xmlNode = node.Attributes.RemoveNamedItem(name); if (xmlNode == null) throw new ConfigurationErrorsException(System.SR.Format(System.SR.Config_base_required_attribute_missing, name), node); if (string.IsNullOrEmpty(xmlNode.Value) && !allowEmpty) throw new ConfigurationErrorsException(System.SR.Format(System.SR.Config_base_required_attribute_empty, name), node); return xmlNode.Value; } internal static void CheckForNonElement(XmlNode node) { if (node.NodeType != XmlNodeType.Element) throw new ConfigurationErrorsException(System.SR.Config_base_elements_only, node); } internal static bool IsIgnorableAlsoCheckForNonElement(XmlNode node) { if (node.NodeType == XmlNodeType.Comment || node.NodeType == XmlNodeType.Whitespace) return true; CheckForNonElement(node); return false; } internal static void CheckForChildNodes(XmlNode node) { if (node.HasChildNodes) throw new ConfigurationErrorsException(System.SR.Config_base_no_child_nodes, node.FirstChild); } internal static void ThrowUnrecognizedElement(XmlNode node) { throw new ConfigurationErrorsException(System.SR.Config_base_unrecognized_element, node); } } }