GtkSharp/generator/CallbackGen.cs

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// GtkSharp.Generation.CallbackGen.cs - The Callback Generatable.
//
// Author: Mike Kestner <mkestner@speakeasy.net>
//
// Copyright (c) 2002-2003 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.IO;
using System.Xml;
public class CallbackGen : GenBase {
private Parameters parms;
private Signature sig = null;
private ImportSignature isig = null;
private ReturnValue retval;
public CallbackGen (XmlElement ns, XmlElement elem) : base (ns, elem)
{
retval = new ReturnValue (elem ["return-type"]);
parms = new Parameters (elem ["parameters"]);
parms.HideData = true;
}
public override string MarshalType {
get {
return NS + "Sharp." + Name + "Native";
}
}
public override string CallByName (string var_name)
{
return var_name + ".NativeDelegate";
}
public override string FromNative(string var)
{
return var;
}
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public string GenWrapper (string ns, GenerationInfo gen_info)
{
string wrapper = Name + "Native";
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string qualname = ns + "Sharp." + wrapper;
isig = new ImportSignature (parms, NS);
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StreamWriter sw = gen_info.OpenStream (qualname);
sw.WriteLine ("namespace " + ns + "Sharp {");
sw.WriteLine ();
sw.WriteLine ("\tusing System;");
sw.WriteLine ();
sw.WriteLine ("#region Autogenerated code");
sw.WriteLine ("\t[GLib.CDeclCallback]");
sw.WriteLine ("\tinternal delegate " + retval.MarshalType + " " + wrapper + "(" + isig + ");");
sw.WriteLine ();
sw.WriteLine ("\tinternal class " + Name + "Wrapper {");
sw.WriteLine ();
sw.WriteLine ("\t\tpublic " + retval.MarshalType + " NativeCallback (" + isig + ")");
sw.WriteLine ("\t\t{");
bool need_sep = false;
string call_str = "";
string cleanup_str = "";
for (int i = 0, idx = 0; i < parms.Count; i++)
{
Parameter p = parms [i];
if (i > 0 && p.IsLength && parms[i-1].IsString)
continue;
if ((i == parms.Count - 1) && p.IsUserData)
continue;
if (p.CType == "GError**") {
sw.WriteLine ("\t\t\t" + p.Name + " = IntPtr.Zero;");
continue;
}
IGeneratable gen = p.Generatable;
sw.Write("\t\t\t" + p.CSType + " _arg" + idx);
if (p.PassAs == "out") {
sw.WriteLine(";");
cleanup_str += "\t\t\t" + p.Name + " = " + gen.CallByName ("_arg" + idx) + ";\n";
} else
sw.WriteLine(" = " + gen.FromNative (p.Name) + ";");
if (need_sep)
call_str += ", ";
else
need_sep = true;
call_str += String.Format ("{0} _arg{1}", p.PassAs, idx);
idx++;
}
sw.Write ("\t\t\t");
string invoke = "managed (" + call_str + ")";
if (retval.MarshalType != "void") {
if (cleanup_str == "")
sw.Write ("return ");
else {
sw.Write (retval.MarshalType + " ret = ");
cleanup_str += "\t\t\treturn ret;\n";
}
SymbolTable table = SymbolTable.Table;
ClassBase ret_wrapper = table.GetClassGen (retval.CType);
if (ret_wrapper != null && (ret_wrapper is ObjectGen || ret_wrapper is OpaqueGen))
sw.WriteLine ("(({0}) {1}).Handle;", retval.CSType, invoke);
else if (table.IsStruct (retval.CType) || table.IsBoxed (retval.CType)) {
// Shoot. I have no idea what to do here.
Console.WriteLine ("Struct return type {0} in callback {1}", retval.CType, CName);
sw.WriteLine ("IntPtr.Zero;");
} else if (table.IsEnum (retval.CType))
sw.WriteLine ("(int) {0};", invoke);
else
sw.WriteLine ("({0}) {1};", retval.MarshalType, table.ToNativeReturn (retval.CType, invoke));
} else
sw.WriteLine (invoke + ";");
if (cleanup_str != "")
sw.Write (cleanup_str);
sw.WriteLine ("\t\t}");
sw.WriteLine ();
sw.WriteLine ("\t\tinternal " + wrapper + " NativeDelegate;");
sw.WriteLine ("\t\t" + NS + "." + Name + " managed;");
sw.WriteLine ();
sw.WriteLine ("\t\tpublic " + Name + "Wrapper (" + NS + "." + Name + " managed)");
sw.WriteLine ("\t\t{");
sw.WriteLine ("\t\t\tthis.managed = managed;");
sw.WriteLine ("\t\t\tif (managed != null)");
sw.WriteLine ("\t\t\t\tNativeDelegate = new " + wrapper + " (NativeCallback);");
sw.WriteLine ("\t\t}");
sw.WriteLine ("\t}");
sw.WriteLine ("#endregion");
sw.WriteLine ("}");
sw.Close ();
return ns + "Sharp." + Name + "Wrapper";
}
public override void Generate (GenerationInfo gen_info)
{
gen_info.CurrentType = Name;
if (!retval.Validate ()) {
Console.WriteLine("rettype: " + retval.CType + " in callback " + CName);
Statistics.ThrottledCount++;
return;
}
if (!parms.Validate ()) {
Console.WriteLine(" in callback " + CName + " **** Stubbing it out ****");
Statistics.ThrottledCount++;
}
sig = new Signature (parms);
StreamWriter sw = gen_info.OpenStream (Name);
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sw.WriteLine ("namespace " + NS + " {");
sw.WriteLine ();
sw.WriteLine ("\tusing System;");
sw.WriteLine ();
sw.WriteLine ("\tpublic delegate " + retval.CSType + " " + Name + "(" + sig.ToString() + ");");
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sw.WriteLine ();
sw.WriteLine ("}");
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sw.Close ();
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GenWrapper (NS, gen_info);
Statistics.CBCount++;
}
}
}