gstreamer/generator/Signal.cs
Sebastian Dröge 4582abb4f3 Fork the Gtk# codegenerator for now
We unfortunately need to do this to properly generate bindings for
GstMiniObject...
2009-05-14 21:38:28 +02:00

327 lines
11 KiB
C#

// GtkSharp.Generation.Signal.cs - The Signal Generatable.
//
// Author: Mike Kestner <mkestner@speakeasy.net>
//
// Copyright (c) 2001-2003 Mike Kestner
// Copyright (c) 2003-2005 Novell, Inc.
// Copyright (c) 2007 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;
public class Signal {
bool marshaled;
string name;
XmlElement elem;
ReturnValue retval;
Parameters parms;
ObjectBase container_type;
public Signal (XmlElement elem, ObjectBase container_type)
{
this.elem = elem;
name = elem.GetAttribute ("name");
marshaled = elem.GetAttribute ("manual") == "true";
retval = new ReturnValue (elem ["return-type"]);
parms = new Parameters (elem["parameters"], container_type.ParserVersion == 1 ? true : false);
this.container_type = container_type;
}
bool Marshaled {
get { return marshaled; }
}
public string Name {
get {
return name;
}
set {
name = value;
}
}
public bool Validate ()
{
if (Name == "") {
Console.Write ("Nameless signal ");
Statistics.ThrottledCount++;
return false;
}
if (!parms.Validate () || !retval.Validate ()) {
Console.Write (" in signal " + Name + " ");
Statistics.ThrottledCount++;
return false;
}
return true;
}
public void GenerateDecl (StreamWriter sw)
{
if (elem.HasAttribute("new_flag") || (container_type != null && container_type.GetSignalRecursively (Name) != null))
sw.Write("new ");
sw.WriteLine ("\t\tevent " + EventHandlerQualifiedName + " " + Name + ";");
}
public string CName {
get {
return "\"" + elem.GetAttribute("cname") + "\"";
}
}
string CallbackSig {
get {
string result = "";
for (int i = 0; i < parms.Count; i++) {
if (i > 0)
result += ", ";
Parameter p = parms [i];
if (p.PassAs != "" && !(p.Generatable is StructBase))
result += p.PassAs + " ";
result += (p.MarshalType + " arg" + i);
}
return result;
}
}
string CallbackName {
get { return Name + "SignalCallback"; }
}
string DelegateName {
get { return Name + "SignalDelegate"; }
}
private string EventArgsName {
get {
if (IsEventHandler)
return "EventArgs";
else
return Name + "Args";
}
}
private string EventArgsQualifiedName {
get {
if (IsEventHandler)
return "System.EventArgs";
else
return container_type.NS + "." + Name + "Args";
}
}
private string EventHandlerName {
get {
if (IsEventHandler)
return "EventHandler";
else if (SymbolTable.Table [container_type.NS + Name + "Handler"] != null)
return Name + "EventHandler";
else
return Name + "Handler";
}
}
private string EventHandlerQualifiedName {
get {
if (IsEventHandler)
return "System.EventHandler";
else
return container_type.NS + "." + EventHandlerName;
}
}
private bool IsEventHandler {
get {
return retval.CSType == "void" && parms.Count == 0;
}
}
public string GenArgsInitialization (StreamWriter sw)
{
if (parms.Count > 0)
sw.WriteLine("\t\t\t\targs.Args = new object[" + parms.Count + "];");
string finish = "";
for (int idx = 0; idx < parms.Count; idx++) {
Parameter p = parms [idx];
IGeneratable igen = p.Generatable;
if (p.PassAs != "out") {
if (igen is ManualGen) {
sw.WriteLine("\t\t\t\tif (arg{0} == IntPtr.Zero)", idx);
sw.WriteLine("\t\t\t\t\targs.Args[{0}] = null;", idx);
sw.WriteLine("\t\t\t\telse {");
sw.WriteLine("\t\t\t\t\targs.Args[" + idx + "] = " + p.FromNative ("arg" + idx) + ";");
sw.WriteLine("\t\t\t\t}");
} else
sw.WriteLine("\t\t\t\targs.Args[" + idx + "] = " + p.FromNative ("arg" + idx) + ";");
}
if (igen is StructBase && p.PassAs == "ref")
finish += "\t\t\t\tif (arg" + idx + " != IntPtr.Zero) System.Runtime.InteropServices.Marshal.StructureToPtr (args.Args[" + (idx-1) + "], arg" + idx + ", false);\n";
else if (p.PassAs != "")
finish += "\t\t\t\targ" + idx + " = " + igen.ToNativeReturn ("((" + p.CSType + ")args.Args[" + (idx - 1) + "])") + ";\n";
}
return finish;
}
public void GenArgsCleanup (StreamWriter sw, string finish)
{
if (retval.IsVoid && finish.Length == 0)
return;
sw.WriteLine("\n\t\t\ttry {");
sw.Write (finish);
if (!retval.IsVoid) {
if (retval.CSType == "bool") {
sw.WriteLine ("\t\t\t\tif (args.RetVal == null)");
sw.WriteLine ("\t\t\t\t\treturn false;");
}
sw.WriteLine("\t\t\t\treturn " + SymbolTable.Table.ToNativeReturn (retval.CType, "((" + retval.CSType + ")args.RetVal)") + ";");
}
sw.WriteLine("\t\t\t} catch (Exception) {");
sw.WriteLine ("\t\t\t\tException ex = new Exception (\"args.RetVal or 'out' property unset or set to incorrect type in " + EventHandlerQualifiedName + " callback\");");
sw.WriteLine("\t\t\t\tGLib.ExceptionManager.RaiseUnhandledException (ex, true);");
sw.WriteLine ("\t\t\t\t// NOTREACHED: above call doesn't return.");
sw.WriteLine ("\t\t\t\tthrow ex;");
sw.WriteLine("\t\t\t}");
}
public void GenCallback (StreamWriter sw)
{
if (IsEventHandler)
return;
string native_signature = "IntPtr inst";
if (parms.Count > 0)
native_signature += ", " + CallbackSig;
native_signature += ", IntPtr gch";
sw.WriteLine ("\t\t[GLib.CDeclCallback]");
sw.WriteLine ("\t\tdelegate {0} {1} ({2});", retval.ToNativeType, DelegateName, native_signature);
sw.WriteLine ();
sw.WriteLine ("\t\tstatic {0} {1} ({2})", retval.ToNativeType, CallbackName, native_signature);
sw.WriteLine("\t\t{");
sw.WriteLine("\t\t\t{0} args = new {0} ();", EventArgsQualifiedName);
sw.WriteLine("\t\t\ttry {");
sw.WriteLine("\t\t\t\tGLib.Signal sig = ((GCHandle) gch).Target as GLib.Signal;");
sw.WriteLine("\t\t\t\tif (sig == null)");
sw.WriteLine("\t\t\t\t\tthrow new Exception(\"Unknown signal GC handle received \" + gch);");
sw.WriteLine();
string finish = GenArgsInitialization (sw);
sw.WriteLine("\t\t\t\t{0} handler = ({0}) sig.Handler;", EventHandlerQualifiedName);
sw.WriteLine("\t\t\t\thandler (GLib.Object.GetObject (inst), args);");
sw.WriteLine("\t\t\t} catch (Exception e) {");
sw.WriteLine("\t\t\t\tGLib.ExceptionManager.RaiseUnhandledException (e, false);");
sw.WriteLine("\t\t\t}");
GenArgsCleanup (sw, finish);
sw.WriteLine("\t\t}");
sw.WriteLine();
}
private bool NeedNew (ObjectBase implementor)
{
return elem.HasAttribute ("new_flag") ||
(container_type != null && container_type.GetSignalRecursively (Name) != null) ||
(implementor != null && implementor.GetSignalRecursively (Name) != null);
}
public void GenEventHandler (GenerationInfo gen_info)
{
if (IsEventHandler)
return;
string ns = container_type.NS;
StreamWriter sw = gen_info.OpenStream (EventHandlerName);
sw.WriteLine ("namespace " + ns + " {");
sw.WriteLine ();
sw.WriteLine ("\tusing System;");
sw.WriteLine ();
sw.WriteLine ("\tpublic delegate void " + EventHandlerName + "(object o, " + EventArgsName + " args);");
sw.WriteLine ();
sw.WriteLine ("\tpublic class " + EventArgsName + " : GLib.SignalArgs {");
for (int i = 0; i < parms.Count; i++) {
sw.WriteLine ("\t\tpublic " + parms[i].CSType + " " + parms[i].StudlyName + "{");
if (parms[i].PassAs != "out") {
sw.WriteLine ("\t\t\tget {");
sw.WriteLine ("\t\t\t\treturn (" + parms[i].CSType + ") Args[" + i + "];");
sw.WriteLine ("\t\t\t}");
}
if (parms[i].PassAs != "") {
sw.WriteLine ("\t\t\tset {");
sw.WriteLine ("\t\t\t\tArgs[" + i + "] = (" + parms[i].CSType + ")value;");
sw.WriteLine ("\t\t\t}");
}
sw.WriteLine ("\t\t}");
sw.WriteLine ();
}
sw.WriteLine ("\t}");
sw.WriteLine ("}");
sw.Close ();
}
public void GenEvent (StreamWriter sw, ObjectBase implementor, string target)
{
string args_type = IsEventHandler ? "" : ", typeof (" + EventArgsQualifiedName + ")";
if (Marshaled) {
GenCallback (sw);
args_type = ", new " + DelegateName + "(" + CallbackName + ")";
}
sw.WriteLine("\t\t[GLib.Signal("+ CName + ")]");
sw.Write("\t\tpublic ");
if (NeedNew (implementor))
sw.Write("new ");
sw.WriteLine("event " + EventHandlerQualifiedName + " " + Name + " {");
sw.WriteLine("\t\t\tadd {");
sw.WriteLine("\t\t\t\tGLib.Signal sig = GLib.Signal.Lookup (" + target + ", " + CName + args_type + ");");
sw.WriteLine("\t\t\t\tsig.AddDelegate (value);");
sw.WriteLine("\t\t\t}");
sw.WriteLine("\t\t\tremove {");
sw.WriteLine("\t\t\t\tGLib.Signal sig = GLib.Signal.Lookup (" + target + ", " + CName + args_type + ");");
sw.WriteLine("\t\t\t\tsig.RemoveDelegate (value);");
sw.WriteLine("\t\t\t}");
sw.WriteLine("\t\t}");
sw.WriteLine();
}
public void Generate (GenerationInfo gen_info, ObjectBase implementor)
{
StreamWriter sw = gen_info.Writer;
if (implementor == null)
GenEventHandler (gen_info);
GenEvent (sw, implementor, "this");
Statistics.SignalCount++;
}
}
}