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OpaqueGen.cs

// GtkSharp.Generation.OpaqueGen.cs - The Opaque Generatable.
//
// Author: Mike Kestner <mkestner@speakeasy.net>
//
// Copyright (c) 2001-2003 Mike Kestner
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of version 2 of the GNU General Public
// License as published by the Free Software Foundation.
//
// This program 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
// General Public License for more details.
//
// You should have received a copy of the GNU General Public
// License along with this program; if not, write to the
// Free Software Foundation, Inc., 59 Temple Place - Suite 330,
// Boston, MA 02111-1307, USA.


namespace GtkSharp.Generation {

      using System;
      using System.Collections;
      using System.IO;
      using System.Xml;

      public class OpaqueGen : HandleBase {

            public OpaqueGen (XmlElement ns, XmlElement elem) : base (ns, elem) {}
      
            public override string FromNative(string var, bool owned)
            {
                  return var + " == IntPtr.Zero ? null : (" + QualifiedName + ") GLib.Opaque.GetOpaque (" + var + ", typeof (" + QualifiedName + "), " + (owned ? "true" : "false") + ")";
            }

            private bool DisableRawCtor {
                  get {
                        return Elem.HasAttribute ("disable_raw_ctor");
                  }
            }

            public override void Generate (GenerationInfo gen_info)
            {
                  gen_info.CurrentType = Name;

                  StreamWriter sw = gen_info.Writer = gen_info.OpenStream (Name);

                  sw.WriteLine ("namespace " + NS + " {");
                  sw.WriteLine ();
                  sw.WriteLine ("\tusing System;");
                  sw.WriteLine ("\tusing System.Collections;");
                  sw.WriteLine ("\tusing System.Runtime.InteropServices;");
                  sw.WriteLine ();

                  sw.WriteLine ("#region Autogenerated code");

                  SymbolTable table = SymbolTable.Table;

                  Method ref_, unref, dispose;
                  GetSpecialMethods (out ref_, out unref, out dispose);

                  if (IsDeprecated)
                        sw.WriteLine ("\t[Obsolete]");
                  sw.Write ("\t{0} class " + Name, IsInternal ? "internal" : "public");
                  string cs_parent = table.GetCSType(Elem.GetAttribute("parent"));
                  if (cs_parent != "")
                        sw.Write (" : " + cs_parent);
                  else
                        sw.Write (" : GLib.Opaque");
                  sw.WriteLine (" {");
                  sw.WriteLine ();
            
                  GenFields (gen_info);
                  GenMethods (gen_info, null, null);
                  GenCtors (gen_info);

                  if (ref_ != null) {
                        ref_.GenerateImport (sw);
                        sw.WriteLine ("\t\tprotected override void Ref (IntPtr raw)");
                        sw.WriteLine ("\t\t{");
                        sw.WriteLine ("\t\t\tif (!Owned) {");
                        sw.WriteLine ("\t\t\t\t" + ref_.CName + " (raw);");
                        sw.WriteLine ("\t\t\t\tOwned = true;");
                        sw.WriteLine ("\t\t\t}");
                        sw.WriteLine ("\t\t}");
                        sw.WriteLine ();

                        if (ref_.IsDeprecated) {
                              sw.WriteLine ("\t\t[Obsolete(\"" + QualifiedName + " is now refcounted automatically\")]");
                              if (ref_.ReturnType == "void")
                                    sw.WriteLine ("\t\tpublic void Ref () {}");
                              else
                                    sw.WriteLine ("\t\tpublic " + Name + " Ref () { return this; }");
                              sw.WriteLine ();
                        }
                  }

                  bool finalizer_needed = false;

                  if (unref != null) {
                        unref.GenerateImport (sw);
                        sw.WriteLine ("\t\tprotected override void Unref (IntPtr raw)");
                        sw.WriteLine ("\t\t{");
                        sw.WriteLine ("\t\t\tif (Owned) {");
                        sw.WriteLine ("\t\t\t\t" + unref.CName + " (raw);");
                        sw.WriteLine ("\t\t\t\tOwned = false;");
                        sw.WriteLine ("\t\t\t}");
                        sw.WriteLine ("\t\t}");
                        sw.WriteLine ();

                        if (unref.IsDeprecated) {
                              sw.WriteLine ("\t\t[Obsolete(\"" + QualifiedName + " is now refcounted automatically\")]");
                              sw.WriteLine ("\t\tpublic void Unref () {}");
                              sw.WriteLine ();
                        }     
                        finalizer_needed = true;
                  }

                  if (dispose != null) {
                        dispose.GenerateImport (sw);
                        sw.WriteLine ("\t\tprotected override void Free (IntPtr raw)");
                        sw.WriteLine ("\t\t{");
                        sw.WriteLine ("\t\t\t" + dispose.CName + " (raw);");
                        sw.WriteLine ("\t\t}");
                        sw.WriteLine ();

                        if (dispose.IsDeprecated) {
                              sw.WriteLine ("\t\t[Obsolete(\"" + QualifiedName + " is now freed automatically\")]");
                              sw.WriteLine ("\t\tpublic void " + dispose.Name + " () {}");
                              sw.WriteLine ();
                        }     
                        finalizer_needed = true;
                  }

                  if (finalizer_needed) {
                        sw.WriteLine ("\t\tclass FinalizerInfo {");
                        sw.WriteLine ("\t\t\tIntPtr handle;");
                        sw.WriteLine ();
                        sw.WriteLine ("\t\t\tpublic FinalizerInfo (IntPtr handle)");
                        sw.WriteLine ("\t\t\t{");
                        sw.WriteLine ("\t\t\t\tthis.handle = handle;");
                        sw.WriteLine ("\t\t\t}");
                        sw.WriteLine ();
                        sw.WriteLine ("\t\t\tpublic bool Handler ()");
                        sw.WriteLine ("\t\t\t{");
                        if (dispose != null)
                              sw.WriteLine ("\t\t\t\t{0} (handle);", dispose.CName);
                        else if (unref != null)
                              sw.WriteLine ("\t\t\t\t{0} (handle);", unref.CName);
                        sw.WriteLine ("\t\t\t\treturn false;");
                        sw.WriteLine ("\t\t\t}");
                        sw.WriteLine ("\t\t}");
                        sw.WriteLine ();
                        sw.WriteLine ("\t\t~{0} ()", Name);
                        sw.WriteLine ("\t\t{");
                        sw.WriteLine ("\t\t\tif (!Owned)");
                        sw.WriteLine ("\t\t\t\treturn;");
                        sw.WriteLine ("\t\t\tFinalizerInfo info = new FinalizerInfo (Handle);");
                        sw.WriteLine ("\t\t\tGLib.Timeout.Add (50, new GLib.TimeoutHandler (info.Handler));");
                        sw.WriteLine ("\t\t}");
                        sw.WriteLine ();
                  }

#if false
                  Method copy = Methods ["Copy"] as Method;
                  if (copy != null && copy.Parameters.Count == 0) {
                        sw.WriteLine ("\t\tprotected override GLib.Opaque Copy (IntPtr raw)");
                        sw.WriteLine ("\t\t{");
                        sw.WriteLine ("\t\t\tGLib.Opaque result = new " + QualifiedName + " (" + copy.CName + " (raw));");
                        sw.WriteLine ("\t\t\tresult.Owned = true;");
                        sw.WriteLine ("\t\t\treturn result;");
                        sw.WriteLine ("\t\t}");
                        sw.WriteLine ();
                  }
#endif
                  sw.WriteLine ("#endregion");
                  
                  AppendCustom(sw, gen_info.CustomDir);

                  sw.WriteLine ("\t}");
                  sw.WriteLine ("}");

                  sw.Close ();
                  gen_info.Writer = null;
                  Statistics.OpaqueCount++;
            }

            void GetSpecialMethods (out Method ref_, out Method unref, out Method dispose)
            {
                  ref_ = CheckSpecialMethod (GetMethod ("Ref"));
                  unref = CheckSpecialMethod (GetMethod ("Unref"));

                  dispose = GetMethod ("Free");
                  if (dispose == null) {
                        dispose = GetMethod ("Destroy");
                        if (dispose == null)
                              dispose = GetMethod ("Dispose");
                  }
                  dispose = CheckSpecialMethod (dispose);
            }

            Method CheckSpecialMethod (Method method)
            {
                  if (method == null)
                        return null;
                  if (method.ReturnType != "void" &&
                      method.ReturnType != QualifiedName)
                        return null;
                  if (method.Signature.ToString () != "")
                        return null;

                  methods.Remove (method.Name);
                  return method;
            }

            protected override void GenCtors (GenerationInfo gen_info)
            {
                  if (!DisableRawCtor) {
                        gen_info.Writer.WriteLine("\t\tpublic " + Name + "(IntPtr raw) : base(raw) {}");
                        gen_info.Writer.WriteLine();
                  }

                  base.GenCtors (gen_info);
            }

      }
}


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