/// <summary>
/// Create <see cref="NewFolding"/>s for the specified document.
/// </summary>
public IEnumerable<NewFolding> CreateNewFoldings(TextDocument document, XmlReader reader, out int firstErrorOffset)
{
Stack<XmlFoldStart> stack = new Stack<XmlFoldStart>();
List<NewFolding> foldMarkers = new List<NewFolding>();
try {
while (reader.Read()) {
switch (reader.NodeType) {
case XmlNodeType.Element:
if (!reader.IsEmptyElement) {
XmlFoldStart newFoldStart = CreateElementFoldStart(document, reader);
stack.Push(newFoldStart);
}
break;
case XmlNodeType.EndElement:
XmlFoldStart foldStart = stack.Pop();
CreateElementFold(document, foldMarkers, reader, foldStart);
break;
case XmlNodeType.Comment:
CreateCommentFold(document, foldMarkers, reader);
break;
}
}
firstErrorOffset = -1;
} catch (XmlException ex) {
// ignore errors at invalid positions (prevent ArgumentOutOfRangeException)
if (ex.LineNumber >= 1 && ex.LineNumber <= document.LineCount)
firstErrorOffset = document.GetOffset(ex.LineNumber, ex.LinePosition);
else
firstErrorOffset = 0;
}
foldMarkers.Sort((a,b) => a.StartOffset.CompareTo(b.StartOffset));
return foldMarkers;
}
static int GetOffset(TextDocument document, XmlReader reader)
{
IXmlLineInfo info = reader as IXmlLineInfo;
if (info != null && info.HasLineInfo()) {
return document.GetOffset(info.LineNumber, info.LinePosition);
} else {
throw new ArgumentException("XmlReader does not have positioning information.");
}
}
/// <summary>
/// Creates an XmlFoldStart for the start tag of an element.
/// </summary>
XmlFoldStart CreateElementFoldStart(TextDocument document, XmlReader reader)
{
// Take off 1 from the offset returned
// from the xml since it points to the start
// of the element name and not the beginning
// tag.
//XmlFoldStart newFoldStart = new XmlFoldStart(reader.Prefix, reader.LocalName, reader.LineNumber - 1, reader.LinePosition - 2);
XmlFoldStart newFoldStart = new XmlFoldStart();
IXmlLineInfo lineInfo = (IXmlLineInfo)reader;
newFoldStart.StartLine = lineInfo.LineNumber;
newFoldStart.StartOffset = document.GetOffset(newFoldStart.StartLine, lineInfo.LinePosition - 1);
if (this.ShowAttributesWhenFolded && reader.HasAttributes) {
newFoldStart.Name = String.Concat("<", reader.Name, " ", GetAttributeFoldText(reader), ">");
} else {
newFoldStart.Name = String.Concat("<", reader.Name, ">");
}
return newFoldStart;
}
/// <summary>
/// Create an element fold if the start and end tag are on
/// different lines.
/// </summary>
static void CreateElementFold(TextDocument document, List<NewFolding> foldMarkers, XmlReader reader, XmlFoldStart foldStart)
{
IXmlLineInfo lineInfo = (IXmlLineInfo)reader;
int endLine = lineInfo.LineNumber;
if (endLine > foldStart.StartLine) {
int endCol = lineInfo.LinePosition + reader.Name.Length + 1;
foldStart.EndOffset = document.GetOffset(endLine, endCol);
foldMarkers.Add(foldStart);
}
}
