public override XmlParserState PushChar(char c, XmlParserContext context, ref string rollback)
{
var namedObject = context.Nodes.Peek() as INamedXObject;
if (namedObject == null || namedObject.Name.Prefix != null)
{
throw new InvalidOperationException("Invalid state");
}
Debug.Assert(context.CurrentStateLength > 0 || IsValidNameStart(c),
"First character pushed to a XmlTagNameState must be a letter.");
Debug.Assert(context.CurrentStateLength > 0 || context.KeywordBuilder.Length == 0,
"Keyword builder must be empty when state begins.");
if (XmlChar.IsWhitespace(c) || c == '<' || c == '>' || c == '/' || c == '=')
{
rollback = string.Empty;
if (context.KeywordBuilder.Length == 0)
{
context.Diagnostics?.LogError("Zero-length name.", context.Position);
namedObject.Name = XName.Empty;
}
else
{
string s = context.KeywordBuilder.ToString();
int i = s.IndexOf(':');
if (i < 0)
{
namedObject.Name = s;
}
else
{
namedObject.Name = new XName(s.Substring(0, i), s.Substring(i + 1));
}
}
return(Parent);
}
if (c == ':')
{
if (context.KeywordBuilder.ToString().IndexOf(':') > 0 && context.BuildTree)
{
context.Diagnostics?.LogError("Unexpected ':' in name.", context.Position);
}
context.KeywordBuilder.Append(c);
return(null);
}
if (XmlChar.IsNameChar(c))
{
context.KeywordBuilder.Append(c);
return(null);
}
rollback = string.Empty;
context.Diagnostics?.LogError($"Unexpected character '{c}' in name", context.Position);
return(Parent);
}
/// <summary>
/// Gets the XML name at the parser's position.
/// </summary>
/// <param name="spine">A spine parser. It will not be modified.</param>
/// <param name="text">The text snapshot corresponding to the parser.</param>
/// <returns></returns>
public static XName GetCompleteName(this XmlSpineParser spine, ITextSource text, int maximumReadahead = DEFAULT_READAHEAD_LIMIT)
{
Debug.Assert(spine.CurrentState is XmlNameState);
int end = spine.Position;
int start = end - spine.CurrentStateLength;
int mid = -1;
int limit = Math.Min(text.Length, end + maximumReadahead);
//try to find the end of the name, but don't go too far
for (; end < limit; end++)
{
char c = text[end];
if (c == ':')
{
if (mid == -1)
{
mid = end;
}
else
{
break;
}
}
else if (!XmlChar.IsNameChar(c))
{
break;
}
}
if (mid > 0 && end > mid + 1)
{
return(new XName(text.GetText(start, mid - start), text.GetText(mid + 1, end - mid - 1)));
}
return(new XName(text.GetText(start, end - start)));
}
