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//
// XmlCommentState.cs
//
// Author:
// Michael Hutchinson <mhutchinson@novell.com>
//
// Copyright (C) 2008 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using MonoDevelop.Xml.Dom;
namespace MonoDevelop.Xml.Parser
{
public class XmlCommentState : XmlParserState
{
const int NOMATCH = 0;
const int SINGLE_DASH = 1;
const int DOUBLE_DASH = 2;
public override XmlParserState PushChar (char c, IXmlParserContext context, ref string rollback)
{
if (context.CurrentStateLength == 1) {
context.Nodes.Push (new XComment (context.LocationMinus ("<!--".Length + 1)));
}
if (c == '-') {
//make sure we know when there are two '-' chars together
if (context.StateTag == NOMATCH)
context.StateTag = SINGLE_DASH;
else
context.StateTag = DOUBLE_DASH;
} else if (context.StateTag == DOUBLE_DASH) {
if (c == '>') {
// if the '--' is followed by a '>', the state has ended
// so attach a node to the DOM and end the state
var comment = (XComment) context.Nodes.Pop ();
if (context.BuildTree) {
comment.End (context.Location);
((XContainer) context.Nodes.Peek ()).AddChildNode (comment);
}
rollback = string.Empty;
return Parent;
} else {
context.LogWarning ("The string '--' should not appear within comments.");
context.StateTag = NOMATCH;
}
} else {
// not any part of a '-->', so make sure matching is reset
context.StateTag = NOMATCH;
}
return null;
}
}
}
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