public ChildInfo(Child data)
{
Data = data;
Occurrences = 0;
Types = ElementTypes.Where((Type t) => Data.ChildEntryType.IsAssignableFrom(t)).ToArray();
ElementNames = new ElementName[Types.Length];
for (int i = 0; i < Types.Length; ++i)
{
Type t = Types[i];
ElementName nameAttrib = t.GetCustomAttribute <ElementName>();
ElementNames[i] = nameAttrib;
if (nameAttrib == null)
{
WriteLine(Data.ChildEntryType.GetFriendlyName() + " has no 'Name' attribute");
}
}
}
/// <summary>
/// Reads a file with root class T asynchronously and returns a new instance.
/// </summary>
/// <param name="path">The path to the file to read.</param>
/// <param name="ignoreFlags">Flags that are bitwise masked against each BaseElement's TypeFlag. If matching, the element is skipped.</param>
/// <param name="settings">The settings for reading an XML file.</param>
/// <param name="progress">Handler for progress as the file is read.</param>
/// <param name="cancel">Handler for if the user wishes to cancel the import.</param>
/// <returns>A new instance of class T.</returns>
public async Task <T> ImportAsync(
string path,
ulong ignoreFlags,
XmlReaderSettings settings,
IProgress <float> progress,
CancellationToken cancel)
{
if (settings == null)
{
settings = GetDefaultReaderSettings();
}
settings.Async = true;
using (FileStream stream = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read))
using (XmlReader reader = XmlReader.Create(stream, settings))
{
string previousTree = "";
Type rootType = typeof(T);
ElementName name = rootType.GetCustomAttribute <ElementName>();
if (name == null || string.IsNullOrEmpty(name.Name))
{
WriteLine($"{rootType.GetFriendlyName()} has no '{nameof(ElementName)}' attribute.");
return(null);
}
bool found;
while (!(found = await reader.MoveToContentAsync() == XmlNodeType.Element &&
string.Equals(name.Name, reader.Name, StringComparison.InvariantCulture)))
{
;
}
if (found)
{
IElement e = await ParseElementAsync(rootType, null, reader, null, ignoreFlags, previousTree, 0, stream, progress, cancel);
progress?.Report(1.0f);
return(e as T);
}
progress?.Report(1.0f);
return(null);
}
}
private IElement ParseElement(
IElement entry,
IElement parent,
XmlReader reader,
string version,
ulong ignoreFlags,
string parentTree,
int elementIndex,
FileStream stream)
{
Type elementType = entry.GetType();
entry.Parent = parent;
entry.ElementIndex = elementIndex;
entry.PreRead();
string parentElementName = reader.Name;
if (string.IsNullOrEmpty(parentElementName))
{
throw new Exception("Null parent element name.");
}
parentTree += parentElementName + "/";
entry.Tree = parentTree;
if (reader.NodeType != XmlNodeType.Element)
{
WriteLine($"Encountered an unexpected node: {reader.Name} '{reader.NodeType.ToString()}'");
reader.Skip();
entry.PostRead();
return(entry);
}
if (entry.ParentType != typeof(IElement) && !entry.ParentType.IsAssignableFrom(parent.GetType()))
{
WriteLine($"Parent mismatch. {elementType.GetFriendlyName()} expected {entry.ParentType.GetFriendlyName()}, but got {parent.GetType().GetFriendlyName()}");
reader.Skip();
entry.PostRead();
return(entry);
}
if ((ignoreFlags & entry.TypeFlag) != 0)
{
reader.Skip();
entry.PostRead();
return(entry);
}
#region Read attributes
MemberInfo[] members = entry.WantsManualRead ? null : elementType.GetMembers(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);
if (reader.HasAttributes)
{
while (reader.MoveToNextAttribute())
{
string name = reader.Name;
string value = reader.Value;
if (entry.WantsManualRead)
{
entry.ManualReadAttribute(name, value);
}
else
{
MemberInfo info = members.FirstOrDefault(x =>
{
Attr a = x.GetCustomAttribute <Attr>();
return(a == null ? false : string.Equals(a.AttributeName, name, StringComparison.InvariantCultureIgnoreCase));
});
if (info == null)
{
WriteLine($"Attribute '{parentTree}[{name}]' not supported by parser. Value = '{value}'");
}
else if (info is FieldInfo field)
{
field.SetValue(entry, value.ParseAs(field.FieldType));
}
else if (info is PropertyInfo property)
{
property.SetValue(entry, value.ParseAs(property.PropertyType));
}
}
}
}
#endregion
if (entry is IVersion v)
{
version = v.Version;
}
entry.OnAttributesRead();
#region Read child elements
reader.MoveToElement();
if (entry is IStringElement stringEntry)
{
stringEntry.GenericStringContent = Activator.CreateInstance(stringEntry.GenericStringType) as BaseElementString;
stringEntry.GenericStringContent.ReadFromString(reader.ReadElementContentAsString());
}
else
{
if (reader.IsEmptyElement)
{
reader.Read();
}
else
{
reader.ReadStartElement();
int childIndex = 0;
ChildInfo[] childElements = entry.WantsManualRead ? null :
elementType.GetCustomAttributesExt <Child>().Select(x => new ChildInfo(x)).ToArray();
MultiChildInfo[] multiChildElements = entry.WantsManualRead ? null :
elementType.GetCustomAttributesExt <MultiChild>().Select(x => new MultiChildInfo(x)).ToArray();
//Read all child elements
while (reader.NodeType != XmlNodeType.EndElement)
{
if (reader.NodeType != XmlNodeType.Element)
{
reader.Skip();
continue;
}
string elementName = reader.Name;
if (string.IsNullOrEmpty(elementName))
{
throw new Exception("Null element name.");
}
if (entry.WantsManualRead)
{
IElement e = entry.ManualReadChildElement(elementName, version);
if (e == null)
{
//Console.WriteLine("Element '{0}' not supported by parser.", parentTree + elementName + "/");
reader.Skip();
}
else
{
ParseElement(e, entry, reader, version, ignoreFlags, parentTree, childIndex, stream);
}
}
else
{
bool isUnsupported = elementType.GetCustomAttributesExt <UnsupportedChild>().
Any(x => string.Equals(x.ElementName, elementName, StringComparison.InvariantCultureIgnoreCase));
if (isUnsupported)
{
WriteLine($"Element '{parentTree + elementName}/' not supported by parser.");
reader.Skip();
}
else
{
int typeIndex = -1;
foreach (ChildInfo child in childElements)
{
typeIndex = Array.FindIndex(child.ElementNames, name => name.Matches(elementName, version));
//If no exact name matches, find a null name child element.
//This means the class is for an element with ANY name.
if (typeIndex < 0)
{
typeIndex = Array.FindIndex(child.ElementNames, name => name.Name == null && name.VersionMatches(version));
}
if (typeIndex >= 0)
{
if (++child.Occurrences > child.Data.MaxCount && child.Data.MaxCount >= 0)
{
WriteLine($"Element '{parentTree}' has occurred more times than expected.");
}
IElement elem = ParseElement(child.Types[typeIndex], entry, reader, version, ignoreFlags, parentTree, childIndex, stream);
elem.ElementName = elementName;
break;
}
}
if (typeIndex < 0)
{
int i = 0;
MultiChildInfo[] infos = multiChildElements.Where(attribInfo =>
{
for (i = 0; i < attribInfo.Attrib.Types.Length; ++i)
{
ElementName name = attribInfo.ElementNames[i];
if (name.Matches(elementName, version))
{
++attribInfo.Occurrences[i];
return(true);
}
}
return(false);
}).ToArray();
if (infos.Length == 0)
{
//Console.WriteLine("Element '{0}' not supported by parser.", parentTree + elementName + "/");
reader.Skip();
}
else
{
//TODO: verify the multi child type
IElement elem = ParseElement(infos[0].Attrib.Types[i], entry, reader, version, ignoreFlags, parentTree, childIndex, stream);
elem.ElementName = elementName;
}
}
}
}
++childIndex;
}
if (!entry.WantsManualRead)
{
ElementName[] underCounted = childElements.
Where(x => x.Occurrences < x.Data.MinCount).
SelectMany(x => x.ElementNames).
Where(x => x.VersionMatches(version)).ToArray();
if (underCounted.Length > 0)
{
foreach (ElementName elem in underCounted)
{
WriteLine($"Element '{elem.Name}' has occurred less times than expected.");
}
}
}
if (reader.Name == parentElementName)
{
reader.ReadEndElement();
}
else
{
throw new Exception("Encountered an unexpected node: " + reader.Name);
}
}
}
#endregion
entry.PostRead();
return(entry);
}
