//     ====================================================================================================
//     YAML Parser for the .NET Framework
//     ====================================================================================================
//
//     Copyright (c) 2006
//         Christophe Lambrechts
//         Jonathan Slenders
//
//     ====================================================================================================
//     This file is part of the .NET YAML Parser.
// 
//     This .NET YAML parser is free software; you can redistribute it and/or modify
//     it under the terms of the GNU Lesser General Public License as published by
//     the Free Software Foundation; either version 2.1 of the License, or
//     (at your option) any later version.
// 
//     The .NET YAML parser is distributed in the hope that it will be useful,
//     but WITHOUT ANY WARRANTY; without even the implied warranty of
//     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//     GNU Lesser General Public License for more details.
// 
//     You should have received a copy of the GNU Lesser General Public License
//     along with Foobar; if not, write to the Free Software
//     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USAusing System.Reflection;
//     ====================================================================================================

#define SUPPORT_NULL_NODES
#define SUPPORT_INTEGER_NODES
#define SUPPORT_FLOAT_NODES
#define SUPPORT_BOOLEAN_NODES
#define SUPPORT_TIMESTAMP_NODES

using System;

namespace Yaml
{
	/// <summary>
	///   All Yaml scalars are derived from this class
	/// </summary>
	public abstract class Scalar : Node
	{
		/// <summary> Constructor </summary>
		public Scalar (string uri, NodeType nodetype) : base (uri, nodetype) { }


		/// <summary>
		///   Parses a scalar
		///   <list type="bullet">
		///     <item>Integer</item>
		///     <item>String</item>
		///     <item>Boolean</item>
		///     <item>Null</item>
		///     <item>Timestamp</item>
		///     <item>Float</item>
		///     <item>Binary</item>
		///   </list>
		/// </summary>
		/// <remarks>
		///   Binary is only parsed behind an explicit !!binary tag (in Node.cs)
		/// </remarks>
		public static new Scalar Parse (ParseStream stream)
		{
			// -----------------
			// Parse scalars
			// -----------------

			stream.BuildLookaheadBuffer ();

			// Try Null
#if SUPPORT_NULL_NODES
			try
			{
				Scalar s = new Null (stream);
				stream.DestroyLookaheadBuffer ();
				return s;
			} catch { }
#endif
			// Try boolean
#if SUPPORT_BOOLEAN_NODES
			stream.RewindLookaheadBuffer ();
			try
			{
				Scalar scalar = new Boolean (stream);
				stream.DestroyLookaheadBuffer ();
				return scalar;
			} 
			catch { }
#endif
			// Try integer
#if SUPPORT_INTEGER_NODES
			stream.RewindLookaheadBuffer ();
			try
			{
				Scalar scalar = new Integer (stream);
				stream.DestroyLookaheadBuffer ();
				return scalar;
			} catch { }
#endif
			// Try Float
#if SUPPORT_FLOAT_NODES
			stream.RewindLookaheadBuffer ();
			try
			{
				Scalar scalar = new Float (stream);
				stream.DestroyLookaheadBuffer ();
				return scalar;
			} 
			catch { }
#endif
			// Try timestamp
#if SUPPORT_TIMESTAMP_NODES
			stream.RewindLookaheadBuffer ();
			try {
				Scalar scalar = new Timestamp (stream);
				stream.DestroyLookaheadBuffer ();
				return scalar;
			} catch { }
#endif
			// Other scalars are strings
			stream.RewindLookaheadBuffer ();
			stream.DestroyLookaheadBuffer ();

			return new String (stream);
		}
		
		/// <summary> Node info </summary>
// TODO, move to each induvidual child
		public override Node Info ()
		{
			Mapping mapping = new Mapping ();
			mapping.AddMappingNode (new String ("kind"), new String ("scalar"));
			mapping.AddMappingNode (new String ("type_id"), new String (URI));
			mapping.AddMappingNode (new String ("value"), this);
			return mapping;
		}
	}
}