// 
// HtmlParser.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 System;
using System.Collections.Generic;
using System.IO;

using MonoDevelop.Ide.TypeSystem;
using MonoDevelop.Projects;
using MonoDevelop.Xml.Dom;
using MonoDevelop.Xml.Parser;
using MonoDevelop.AspNet.Html.Parser;
using MonoDevelop.Core;

namespace MonoDevelop.AspNet.Html
{
	public class HtmlParser : TypeSystemParser
	{
		public override System.Threading.Tasks.Task<ParsedDocument> Parse (ParseOptions parseOptions, System.Threading.CancellationToken cancellationToken)
		{
			var doc = new MonoDevelop.Xml.Editor.XmlParsedDocument (parseOptions.FileName);
			doc.Flags = ParsedDocumentFlags.NonSerializable;
			
			try {
				var xmlParser = new XmlParser (
					new XmlRootState (new HtmlTagState (), new HtmlClosingTagState (true)),
					true);
				
				xmlParser.Parse (parseOptions.Content.CreateReader ());
				doc.XDocument = xmlParser.Nodes.GetRoot ();
				doc.AddRange (xmlParser.Errors);
				if (doc.XDocument != null)
					doc.AddRange (Validate (doc.XDocument));
			}
			catch (Exception ex) {
				MonoDevelop.Core.LoggingService.LogError ("Unhandled error parsing HTML document", ex);
			}
			return System.Threading.Tasks.Task.FromResult((ParsedDocument)doc);
		}
		
		IEnumerable<Error> Validate (XDocument doc)
		{
			foreach (XNode node in doc.Nodes) {
				if (node is XElement && !Object.ReferenceEquals (node, doc.RootElement)) {
					yield return new Error (ErrorType.Warning, GettextCatalog.GetString ("More than one root element"), node.Region);
				}
			}
		}
	}
}