private async Task <IElement> ParseElementAsync(
IElement entry,
IElement parent,
XmlReader reader,
string version,
ulong ignoreFlags,
string parentTree,
int elementIndex,
CancellationToken cancel)
{
if (cancel.IsCancellationRequested)
{
return(null);
}
//DateTime startTime = DateTime.Now;
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)
{
Engine.PrintLine("Encountered an unexpected node: {0} '{1}'", reader.Name, reader.NodeType.ToString());
await reader.SkipAsync();
entry.PostRead();
return(entry);
}
if (entry.ParentType != typeof(IElement) && !entry.ParentType.IsAssignableFrom(parent.GetType()))
{
Engine.PrintLine("Parent mismatch. {0} expected {1}, but got {2}", elementType.GetFriendlyName(), entry.ParentType.GetFriendlyName(), parent.GetType().GetFriendlyName());
await reader.SkipAsync();
entry.PostRead();
return(entry);
}
if ((ignoreFlags & entry.TypeFlag) != 0)
{
await reader.SkipAsync();
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())
{
if (cancel.IsCancellationRequested)
{
return(null);
}
string name = reader.Name;
string value = reader.Value;
if (entry.WantsManualRead)
{
entry.ManualReadAttribute(name, value);
}
else
{
MemberInfo info = members.FirstOrDefault(x =>
{
var a = x.GetCustomAttribute <Attr>();
return(a == null ? false : string.Equals(a.AttributeName, name, StringComparison.InvariantCultureIgnoreCase));
});
if (info == null)
{
//Engine.PrintLine("Attribute '{0}[{1}]' not supported by parser. Value = '{2}'", parentTree, name, 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
if (cancel.IsCancellationRequested)
{
return(null);
}
reader.MoveToElement();
if (entry is IStringElement stringEntry)
{
stringEntry.GenericStringContent = Activator.CreateInstance(stringEntry.GenericStringType) as BaseElementString;
stringEntry.GenericStringContent.ReadFromString(await reader.ReadElementContentAsStringAsync());
}
else
{
if (reader.IsEmptyElement)
{
await reader.ReadAsync();
}
else
{
reader.ReadStartElement();
int childIndex = 0;
ChildInfo[] childElements = entry.WantsManualRead ? null :
elementType.GetCustomAttributesExt <ElementChild>().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 (cancel.IsCancellationRequested)
{
return(null);
}
if (reader.NodeType != XmlNodeType.Element)
{
await reader.SkipAsync();
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)
{
//Engine.PrintLine("Element '{0}' not supported by parser.", parentTree + elementName + "/");
await reader.SkipAsync();
}
else
{
await ParseElementAsync(e, entry, reader, version, ignoreFlags, parentTree, childIndex, cancel);
}
}
else
{
bool isUnsupported = elementType.GetCustomAttributes <UnsupportedElementChild>().
Any(x => string.Equals(x.ElementName, elementName, StringComparison.InvariantCultureIgnoreCase));
if (isUnsupported)
{
if (string.IsNullOrEmpty(elementName))
{
throw new Exception("Null element name.");
}
//Engine.PrintLine("Element '{0}' not supported by parser.", parentTree + elementName + "/");
await reader.SkipAsync();
}
else
{
int typeIndex = -1;
foreach (ChildInfo child in childElements)
{
if (cancel.IsCancellationRequested)
{
return(null);
}
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)
{
Engine.PrintLine("Element '{0}' has occurred more times than expected.", parentTree);
}
IElement elem = await ParseElementAsync(child.Types[typeIndex], entry, reader, version, ignoreFlags, parentTree, childIndex, cancel);
elem.ElementName = elementName;
break;
}
}
if (typeIndex < 0)
{
if (cancel.IsCancellationRequested)
{
return(null);
}
int i = 0;
MultiChildInfo info = multiChildElements.FirstOrDefault(c =>
{
for (i = 0; i < c.Data.Types.Length; ++i)
{
ElementName name = c.ElementNames[i];
if (name.Matches(elementName, version))
{
++c.Occurrences[i];
return(true);
}
}
return(false);
});
if (info == null)
{
//Engine.PrintLine("Element '{0}' not supported by parser.", parentTree + elementName + "/");
await reader.SkipAsync();
}
else
{
IElement elem = await ParseElementAsync(info.Data.Types[i], entry, reader, version, ignoreFlags, parentTree, childIndex, cancel);
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 c in underCounted)
{
Engine.PrintLine("Element '{0}' has occurred less times than expected.", c.Name);
}
}
}
if (reader.Name == parentElementName)
{
reader.ReadEndElement();
}
else
{
throw new Exception("Encountered an unexpected node: " + reader.Name);
}
}
}
#endregion
entry.PostRead();
//TimeSpan elapsed = DateTime.Now - startTime;
//if (elapsed.TotalSeconds > 1.0f)
// if (entry is IID id && !string.IsNullOrEmpty(id.ID))
// Engine.PrintLine("Parsing {0}{2} took {1} seconds.", parentTree, elapsed.TotalSeconds.ToString(), id.ID);
// else
// Engine.PrintLine("Parsing {0} took {1} seconds.", parentTree, elapsed.TotalSeconds.ToString());
return(entry);
}
