//
// tree.cs: keeps a tree representation of the generated code
//
// Author: Miguel de Icaza (miguel@gnu.org)
//
// Licensed under the terms of the GNU GPL
//
// (C) 2001 Ximian, Inc (http://www.ximian.com)
//
//

using System;
using System.Collections;
using System.Reflection;
using System.Reflection.Emit;
using System.IO;

namespace Mono.CSharp
{

	public interface ITreeDump {
		int  Dump (Tree tree, StreamWriter output);
		void ParseOptions (string options);
	}

	// <summary>
	//   
	//   We store here all the toplevel types that we have parsed,
	//   this is the root of all information we have parsed.
	// 
	// </summary>
	
	public class Tree {
		TypeContainer root_types;

		// <summary>
		//   Keeps track of all the types definied (classes, structs, ifaces, enums)
		// </summary>
		Hashtable decls;
		
		public Tree ()
		{
			root_types = new RootTypes ();

			decls = new Hashtable ();
		}

		// TODO: Move this check to current_container.Add..... method
		// I guess we can save cpu&mem
		public void RecordDecl (Namespace ns, MemberName name, DeclSpace ds)
		{
			DeclSpace other = (DeclSpace) decls [name];
			if (other != null){
				Report.SymbolRelatedToPreviousError (other);

				PartialContainer other_pc = other as PartialContainer;
				if (ds is TypeContainer && other_pc != null) {
					Report.SymbolRelatedToPreviousError (other);
					Report.Error (260, ds.Location,
						"Missing partial modifier on declaration of type `{0}'. Another partial declaration of this type exists",
						name);
				}
				else
					Report.Error (101, ds.Location, 
						"The namespace `{0}' already contains a definition for `{1}'", ns.GetSignatureForError (), name.Name);
				return;
			}

			decls.Add (name, ds);

			if (ds.Parent == Types)
				ns.AddDeclSpace (name.Basename, ds);
		}
		
		//
		// FIXME: Why are we using Types?
		//
                public TypeContainer Types {
                        get { return root_types; }
                }

		public DeclSpace GetDecl (MemberName name)
		{
			return (DeclSpace) decls [name];
		}

		public Hashtable AllDecls {
			get { return decls; }
		}
	}

	public class RootTypes : TypeContainer
	{
		public RootTypes ()
			: base (null, null, MemberName.Null, null, Kind.Root,
				Location.Null)
		{
			ec = new EmitContext (null, this, Location.Null, null, null, 0, false);
		}

		public override PendingImplementation GetPendingImplementations ()
		{
			throw new InvalidOperationException ();
		}

		public override bool IsClsCompliaceRequired (DeclSpace ds)
		{
			return true;
		}

		public override string GetSignatureForError ()
		{
			return "";
		}


	}
}