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Method.cs

// GtkSharp.Generation.Method.cs - The Method Generatable.
//
// Author: Mike Kestner <mkestner@speakeasy.net>
//
// Copyright (c) 2001-2003 Mike Kestner
// Copyright (c) 2003-2004 Novell, Inc.
//
// 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;

00030       public class Method : MethodBase  {
            
            private ReturnValue retval;

            private string call;
            private bool is_get, is_set;
            private bool deprecated = false;

            public Method (XmlElement elem, ClassBase container_type) : base (elem, container_type)
            {
                  this.retval = new ReturnValue (elem["return-type"]);
                  
                  if (!container_type.IsDeprecated && elem.HasAttribute ("deprecated")) {
                        string attr = elem.GetAttribute ("deprecated");
                        deprecated = attr == "1" || attr == "true";
                  }
                  
                  if (Name == "GetType")
                        Name = "GetGType";
            }

            public bool IsDeprecated {
                  get {
                        return deprecated;
                  }
            }

            public bool IsGetter {
                  get {
                        return is_get;
                  }
            }

            public bool IsSetter {
                  get {
                        return is_set;
                  }
            }

            public string ReturnType {
                  get {
                        return retval.CSType;
                  }
            }

            public override bool Validate ()
            {
                  if (!retval.Validate () || !base.Validate ()) {
                        Console.Write(" in method " + Name + " ");
                        return false;
                  }

                  Parameters parms = Parameters;
                  is_get = ((((parms.IsAccessor && retval.IsVoid) || (parms.Count == 0 && !retval.IsVoid)) || (parms.Count == 0 && !retval.IsVoid)) && HasGetterName);
                  is_set = ((parms.IsAccessor || (parms.VisibleCount == 1 && retval.IsVoid)) && HasSetterName);

                  call = "(" + (IsStatic ? "" : container_type.CallByName () + (parms.Count > 0 ? ", " : "")) + Body.GetCallString (is_set) + ")";

                  return true;
            }
            
            private Method GetComplement ()
            {
                  char complement;
                  if (is_get)
                        complement = 'S';
                  else
                        complement = 'G';
                  
                  return container_type.GetMethod (complement + BaseName.Substring (1));
            }
            
            public string Declaration {
                  get {
                        return retval.CSType + " " + Name + " (" + (Signature != null ? Signature.ToString() : "") + ");";
                  }
            }

            private void GenerateDeclCommon (StreamWriter sw, ClassBase implementor)
            {
                  GenerateDeclCommon (sw, implementor, false);
            }

            private void GenerateDeclCommon (StreamWriter sw, ClassBase implementor, bool is_interface)
            {
                  if (IsStatic)
                        sw.Write("static ");
                  sw.Write (Safety);
                  Method dup = null;
                  if (container_type != null)
                        dup = container_type.GetMethodRecursively (Name);
                  if (implementor != null)
                        dup = implementor.GetMethodRecursively (Name);

                  if (Name == "ToString" && Parameters.Count == 0 && !is_interface)
                        sw.Write("override ");
                  else if (Name == "GetGType" && container_type is ObjectGen)
                        sw.Write("new ");
                  else if (Modifiers == "new " || (dup != null && ((dup.Signature != null && Signature != null && dup.Signature.ToString() == Signature.ToString()) || (dup.Signature == null && Signature == null))))
                        sw.Write("new ");

                  if (is_get || is_set) {
                        if (retval.IsVoid)
                              sw.Write (Parameters.AccessorReturnType);
                        else
                              sw.Write(retval.CSType);
                        sw.Write(" ");
                        if (Name.StartsWith ("Get") || Name.StartsWith ("Set"))
                              sw.Write (Name.Substring (3));
                        else {
                              int dot = Name.LastIndexOf ('.');
                              if (dot != -1 && (Name.Substring (dot + 1, 3) == "Get" || Name.Substring (dot + 1, 3) == "Set"))
                                    sw.Write (Name.Substring (0, dot + 1) + Name.Substring (dot + 4));
                              else
                                    sw.Write (Name);
                        }
                        sw.WriteLine(" { ");
                  } else if (IsAccessor) {
                        sw.Write (Signature.AccessorType + " " + Name + "(" + Signature.AsAccessor + ")");
                  } else {
                        sw.Write(retval.CSType + " " + Name + "(" + (Signature != null ? Signature.ToString() : "") + ")");
                  }
            }

            public void GenerateDecl (StreamWriter sw)
            {
                  GenerateDecl (sw, false);
            }

            public void GenerateDecl (StreamWriter sw, bool is_interface)
            {
                  if (IsStatic)
                        return;

                  if (is_get || is_set)
                  {
                        Method comp = GetComplement ();
                        if (comp != null && is_set)
                              return;
                  
                        sw.Write("\t\t");
                        GenerateDeclCommon (sw, null);

                        sw.Write("\t\t\t");
                        sw.Write ((is_get) ? "get;" : "set;");

                        if (comp != null && comp.is_set)
                              sw.WriteLine (" set;");
                        else
                              sw.WriteLine ();

                        sw.WriteLine ("\t\t}");
                  }
                  else
                  {
                        sw.Write("\t\t");
                        GenerateDeclCommon (sw, null, is_interface);
                        sw.WriteLine (";");
                  }

                  Statistics.MethodCount++;
            }

            public void GenerateImport (StreamWriter sw)
            {
                  string import_sig = IsStatic ? "" : container_type.MarshalType + " raw";
                  import_sig += !IsStatic && Parameters.Count > 0 ? ", " : "";
                  import_sig += Parameters.ImportSignature.ToString();
                  sw.WriteLine("\t\t[DllImport(\"" + LibraryName + "\")]");
                  if (retval.MarshalType.StartsWith ("[return:"))
                        sw.WriteLine("\t\t" + retval.MarshalType + " static extern " + Safety + retval.CSType + " " + CName + "(" + import_sig + ");");
                  else
                        sw.WriteLine("\t\tstatic extern " + Safety + retval.MarshalType + " " + CName + "(" + import_sig + ");");
                  sw.WriteLine();
            }

            public void Generate (GenerationInfo gen_info, ClassBase implementor)
            {
                  if (!Validate ())
                        return;

                  Method comp = null;

                  gen_info.CurrentMember = Name;

                  /* we are generated by the get Method, if there is one */
                  if (is_set || is_get)
                  {
                        if (Modifiers != "new " && container_type.GetPropertyRecursively (Name.Substring (3)) != null)
                              return;
                        comp = GetComplement ();
                        if (comp != null && is_set) {
                              if (Parameters.AccessorReturnType == comp.ReturnType)
                                    return;
                              else {
                                    is_set = false;
                                    call = "(Handle, " + Body.GetCallString (false) + ")";
                                    comp = null;
                              }
                        }
                        /* some setters take more than one arg */
                        if (comp != null && !comp.is_set)
                              comp = null;
                  }
                  
                  GenerateImport (gen_info.Writer);
                  if (comp != null && retval.CSType == comp.Parameters.AccessorReturnType)
                        comp.GenerateImport (gen_info.Writer);

                  if (IsDeprecated)
                        gen_info.Writer.WriteLine("\t\t[Obsolete]");
                  gen_info.Writer.Write("\t\t");
                  if (Protection != "")
                        gen_info.Writer.Write("{0} ", Protection);
                  GenerateDeclCommon (gen_info.Writer, implementor);

                  if (is_get || is_set)
                  {
                        gen_info.Writer.Write ("\t\t\t");
                        gen_info.Writer.Write ((is_get) ? "get" : "set");
                        GenerateBody (gen_info, implementor, "\t");
                  }
                  else
                        GenerateBody (gen_info, implementor, "");
                  
                  if (is_get || is_set)
                  {
                        if (comp != null && retval.CSType == comp.Parameters.AccessorReturnType)
                        {
                              gen_info.Writer.WriteLine ();
                              gen_info.Writer.Write ("\t\t\tset");
                              comp.GenerateBody (gen_info, implementor, "\t");
                        }
                        gen_info.Writer.WriteLine ();
                        gen_info.Writer.WriteLine ("\t\t}");
                  }
                  else
                        gen_info.Writer.WriteLine();
                  
                  gen_info.Writer.WriteLine();

                  Statistics.MethodCount++;
            }

            public void GenerateBody (GenerationInfo gen_info, ClassBase implementor, string indent)
            {
                  StreamWriter sw = gen_info.Writer;
                  sw.WriteLine(" {");
                  if (!IsStatic && implementor != null)
                        implementor.Prepare (sw, indent + "\t\t\t");
                  if (IsAccessor)
                        Body.InitAccessor (sw, Signature, indent);
                  Body.Initialize(gen_info, is_get, is_set, indent);

                  sw.Write(indent + "\t\t\t");
                  if (retval.IsVoid)
                        sw.WriteLine(CName + call + ";");
                  else {
                        sw.WriteLine(retval.MarshalType + " raw_ret = " + CName + call + ";");
                        sw.WriteLine(indent + "\t\t\t" + retval.CSType + " ret = " + retval.FromNative ("raw_ret") + ";");
                  }

                  if (!IsStatic && implementor != null)
                        implementor.Finish (sw, indent + "\t\t\t");
                  Body.Finish (sw, indent);
                  Body.HandleException (sw, indent);

                  if (is_get && Parameters.Count > 0) 
                        sw.WriteLine (indent + "\t\t\treturn " + Parameters.AccessorName + ";");
                  else if (!retval.IsVoid)
                        sw.WriteLine (indent + "\t\t\treturn ret;");
                  else if (IsAccessor)
                        Body.FinishAccessor (sw, Signature, indent);

                  sw.Write(indent + "\t\t}");
            }

            bool IsAccessor { 
                  get { 
                        return retval.IsVoid && Signature.IsAccessor; 
                  } 
            }
      }
}


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