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ManagedCallString.cs

// GtkSharp.Generation.ManagedCallString.cs - The ManagedCallString Class.
//
// Author: Mike Kestner <mkestner@speakeasy.net>
//
// Copyright (c) 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;

00028       public class ManagedCallString {
            
            ArrayList parms = new ArrayList ();
            ArrayList special = new ArrayList ();
            string error_param = null;
            string user_data_param = null;
            string destroy_param = null;

            public ManagedCallString (Parameters parms, bool drop_first)
            {
                  for (int i = drop_first ? 1 : 0; i < parms.Count; i ++) {
                        Parameter p = parms [i];
                        if (p.IsLength && i > 0 && parms [i-1].IsString) 
                              continue;
                        else if (p.Scope == "notified") {
                              user_data_param = parms[i+1].Name;
                              destroy_param = parms[i+2].Name;
                              i += 2;
                        } else if (p.IsUserData && parms.IsHidden (p)) {
                              user_data_param = p.Name;
                              continue;
                        } else if (p is ErrorParameter) {
                              error_param = p.Name;
                              continue;
                        }
                        this.parms.Add (p);

                        if (p.PassAs != String.Empty && (p.Name != p.FromNative (p.Name)))
                              this.special.Add (true);
                        else if (p.Generatable is CallbackGen)
                              this.special.Add (true);
                        else
                              this.special.Add (false);
                  }
            }

            public bool HasOutParam {
                  get {
                        foreach (Parameter p in parms) {
                              if (p.PassAs == "out")
                                    return true;
                        }
                        return false;
                  }
            }

            public string Unconditional (string indent) {
                  string ret = "";
                  if (error_param != null)
                        ret = indent + error_param + " = IntPtr.Zero;\n";
                  return ret;
            }

            public string Setup (string indent)
            {
                  string ret = "";

                  for (int i = 0; i < parms.Count; i ++) {
                        if ((bool)special[i] == false)
                              continue;

                        Parameter p = parms [i] as Parameter;
                        IGeneratable igen = p.Generatable;

                        if (igen is CallbackGen) {
                              if (user_data_param == null)
                                    ret += indent + String.Format ("{0} {1}_invoker = new {0} ({1});\n", (igen as CallbackGen).InvokerName, p.Name);
                              else if (destroy_param == null)
                                    ret += indent + String.Format ("{0} {1}_invoker = new {0} ({1}, {2});\n", (igen as CallbackGen).InvokerName, p.Name, user_data_param);
                              else
                                    ret += indent + String.Format ("{0} {1}_invoker = new {0} ({1}, {2}, {3});\n", (igen as CallbackGen).InvokerName, p.Name, user_data_param, destroy_param);
                        } else {
                              ret += indent + igen.QualifiedName + " my" + p.Name;
                              if (p.PassAs == "ref")
                                    ret += " = " + p.FromNative (p.Name);
                              ret += ";\n";
                        }
                  }

                  return ret;
            }

            public override string ToString ()
            {
                  if (parms.Count < 1)
                        return "";

                  string[] result = new string [parms.Count];

                  for (int i = 0; i < parms.Count; i ++) {
                        Parameter p = parms [i] as Parameter;
                        result [i] = p.PassAs == "" ? "" : p.PassAs + " ";
                        if (p.Generatable is CallbackGen)
                              result [i] += p.Name + "_invoker.Handler";
                        else
                              result [i] += ((bool)special[i]) ? "my" + p.Name : p.FromNative (p.Name);
                  }

                  return String.Join (", ", result);
            }

            public string Finish (string indent)
            {
                  string ret = "";

                  for (int i = 0; i < parms.Count; i ++) {
                        if ((bool)special[i] == false)
                              continue;

                        Parameter p = parms [i] as Parameter;
                        IGeneratable igen = p.Generatable;

                        if (igen is CallbackGen)
                              continue;
                        else if (igen is StructBase || igen is ByRefGen)
                              ret += indent + String.Format ("if ({0} != IntPtr.Zero) System.Runtime.InteropServices.Marshal.StructureToPtr (my{0}, {0}, false);\n", p.Name);
                        else
                              ret += indent + p.Name + " = " + igen.ToNativeReturn ("my" + p.Name) + ";\n";
                  }

                  return ret;
            }
      }
}


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