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329 lines
11 KiB
C#
329 lines
11 KiB
C#
// GtkSharp.Generation.Signal.cs - The Signal Generatable.
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//
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// Author: Mike Kestner <mkestner@speakeasy.net>
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//
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// Copyright (c) 2001-2003 Mike Kestner
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// Copyright (c) 2003-2005 Novell, Inc.
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// Copyright (c) 2007 Novell, Inc.
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of version 2 of the GNU General Public
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// License as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public
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// License along with this program; if not, write to the
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// Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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// Boston, MA 02111-1307, USA.
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namespace GtkSharp.Generation {
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using System;
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using System.Collections;
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using System.IO;
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using System.Xml;
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public class Signal {
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bool marshaled;
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string name;
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XmlElement elem;
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ReturnValue retval;
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Parameters parms;
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ObjectBase container_type;
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public Signal (XmlElement elem, ObjectBase container_type)
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{
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this.elem = elem;
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name = elem.GetAttribute ("name");
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marshaled = elem.GetAttribute ("manual") == "true";
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retval = new ReturnValue (elem ["return-type"]);
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parms = new Parameters (elem["parameters"], container_type.ParserVersion == 1 ? true : false);
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this.container_type = container_type;
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}
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bool Marshaled {
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get { return marshaled; }
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}
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public string Name {
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get {
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return name;
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}
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set {
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name = value;
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}
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}
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public bool Validate ()
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{
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if (Name == "") {
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Console.Write ("Nameless signal ");
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Statistics.ThrottledCount++;
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return false;
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}
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if (!parms.Validate () || !retval.Validate ()) {
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Console.Write (" in signal " + Name + " ");
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Statistics.ThrottledCount++;
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return false;
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}
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return true;
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}
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public void GenerateDecl (StreamWriter sw)
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{
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if (elem.HasAttribute("new_flag") || (container_type != null && container_type.GetSignalRecursively (Name) != null))
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sw.Write("new ");
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sw.WriteLine ("\t\tevent " + EventHandlerQualifiedName + " " + Name + ";");
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}
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public string CName {
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get {
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return "\"" + elem.GetAttribute("cname") + "\"";
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}
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}
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string CallbackSig {
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get {
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string result = "";
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for (int i = 0; i < parms.Count; i++) {
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if (i > 0)
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result += ", ";
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Parameter p = parms [i];
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if (p.PassAs != "" && !(p.Generatable is StructBase))
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result += p.PassAs + " ";
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result += (p.MarshalType + " arg" + i);
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}
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return result;
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}
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}
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string CallbackName {
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get { return Name + "SignalCallback"; }
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}
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string DelegateName {
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get { return Name + "SignalDelegate"; }
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}
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private string EventArgsName {
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get {
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if (IsEventHandler)
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return "EventArgs";
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else
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return Name + "Args";
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}
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}
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private string EventArgsQualifiedName {
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get {
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if (IsEventHandler)
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return "System.EventArgs";
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else
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return container_type.NS + "." + Name + "Args";
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}
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}
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private string EventHandlerName {
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get {
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if (IsEventHandler)
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return "EventHandler";
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else if (SymbolTable.Table [container_type.NS + Name + "Handler"] != null)
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return Name + "EventHandler";
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else
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return Name + "Handler";
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}
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}
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private string EventHandlerQualifiedName {
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get {
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if (IsEventHandler)
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return "System.EventHandler";
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else
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return container_type.NS + "." + EventHandlerName;
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}
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}
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private bool IsEventHandler {
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get {
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return retval.CSType == "void" && parms.Count == 0;
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}
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}
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public string GenArgsInitialization (StreamWriter sw)
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{
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if (parms.Count > 0)
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sw.WriteLine("\t\t\t\targs.Args = new object[" + parms.Count + "];");
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string finish = "";
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for (int idx = 0; idx < parms.Count; idx++) {
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Parameter p = parms [idx];
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IGeneratable igen = p.Generatable;
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if (p.PassAs != "out") {
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if (igen is ManualGen) {
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sw.WriteLine("\t\t\t\tif (arg{0} == IntPtr.Zero)", idx);
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sw.WriteLine("\t\t\t\t\targs.Args[{0}] = null;", idx);
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sw.WriteLine("\t\t\t\telse {");
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sw.WriteLine("\t\t\t\t\targs.Args[" + idx + "] = " + p.FromNative ("arg" + idx) + ";");
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sw.WriteLine("\t\t\t\t}");
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} else
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sw.WriteLine("\t\t\t\targs.Args[" + idx + "] = " + p.FromNative ("arg" + idx) + ";");
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}
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if ((igen is StructBase || igen is ByRefGen) && p.PassAs != "")
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finish += "\t\t\t\tif (arg" + idx + " != IntPtr.Zero) System.Runtime.InteropServices.Marshal.StructureToPtr (args.Args[" + idx + "], arg" + idx + ", false);\n";
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else if (igen is IManualMarshaler && p.PassAs != "")
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finish += String.Format ("\t\t\t\targ{0} = {1};\n", idx, (igen as IManualMarshaler).AllocNative ("args.Args[" + idx + "]"));
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else if (p.PassAs != "")
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finish += "\t\t\t\targ" + idx + " = " + igen.CallByName ("((" + p.CSType + ")args.Args[" + idx + "])") + ";\n";
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}
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return finish;
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}
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public void GenArgsCleanup (StreamWriter sw, string finish)
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{
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if (retval.IsVoid && finish.Length == 0)
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return;
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sw.WriteLine("\n\t\t\ttry {");
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sw.Write (finish);
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if (!retval.IsVoid) {
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if (retval.CSType == "bool") {
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sw.WriteLine ("\t\t\t\tif (args.RetVal == null)");
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sw.WriteLine ("\t\t\t\t\treturn false;");
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}
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sw.WriteLine ("\t\t\t\treturn {0};", retval.ToNative (String.Format ("(({0}) args.RetVal)", retval.CSType)));
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}
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sw.WriteLine("\t\t\t} catch (Exception) {");
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sw.WriteLine ("\t\t\t\tException ex = new Exception (\"args.RetVal or 'out' property unset or set to incorrect type in " + EventHandlerQualifiedName + " callback\");");
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sw.WriteLine("\t\t\t\tGst.GLib.ExceptionManager.RaiseUnhandledException (ex, true);");
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sw.WriteLine ("\t\t\t\t// NOTREACHED: above call doesn't return.");
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sw.WriteLine ("\t\t\t\tthrow ex;");
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sw.WriteLine("\t\t\t}");
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}
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public void GenCallback (StreamWriter sw)
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{
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if (IsEventHandler)
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return;
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string native_signature = "IntPtr inst";
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if (parms.Count > 0)
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native_signature += ", " + CallbackSig;
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native_signature += ", IntPtr gch";
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sw.WriteLine ("\t\t[UnmanagedFunctionPointer (CallingConvention.Cdecl)]");
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sw.WriteLine ("\t\tdelegate {0} {1} ({2});", retval.ToNativeType, DelegateName, native_signature);
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sw.WriteLine ();
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sw.WriteLine ("\t\tstatic {0} {1} ({2})", retval.ToNativeType, CallbackName, native_signature);
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sw.WriteLine("\t\t{");
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sw.WriteLine("\t\t\t{0} args = new {0} ();", EventArgsQualifiedName);
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sw.WriteLine("\t\t\ttry {");
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sw.WriteLine("\t\t\t\tGst.GLib.Signal sig = ((GCHandle) gch).Target as Gst.GLib.Signal;");
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sw.WriteLine("\t\t\t\tif (sig == null)");
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sw.WriteLine("\t\t\t\t\tthrow new Exception(\"Unknown signal GC handle received \" + gch);");
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sw.WriteLine();
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string finish = GenArgsInitialization (sw);
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sw.WriteLine("\t\t\t\t{0} handler = ({0}) sig.Handler;", EventHandlerQualifiedName);
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sw.WriteLine("\t\t\t\thandler (Gst.GLib.Object.GetObject (inst), args);");
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sw.WriteLine("\t\t\t} catch (Exception e) {");
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sw.WriteLine("\t\t\t\tGst.GLib.ExceptionManager.RaiseUnhandledException (e, false);");
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sw.WriteLine("\t\t\t}");
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GenArgsCleanup (sw, finish);
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sw.WriteLine("\t\t}");
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sw.WriteLine();
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}
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private bool NeedNew (ObjectBase implementor)
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{
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return elem.HasAttribute ("new_flag") ||
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(container_type != null && container_type.GetSignalRecursively (Name) != null) ||
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(implementor != null && implementor.GetSignalRecursively (Name) != null);
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}
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public void GenEventHandler (GenerationInfo gen_info)
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{
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if (IsEventHandler)
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return;
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string ns = container_type.NS;
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StreamWriter sw = gen_info.OpenStream (EventHandlerName);
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sw.WriteLine ("namespace " + ns + " {");
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sw.WriteLine ();
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sw.WriteLine ("\tusing System;");
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sw.WriteLine ();
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sw.WriteLine ("\tpublic delegate void " + EventHandlerName + "(object o, " + EventArgsName + " args);");
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sw.WriteLine ();
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sw.WriteLine ("\tpublic class " + EventArgsName + " : Gst.GLib.SignalArgs {");
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for (int i = 0; i < parms.Count; i++) {
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sw.WriteLine ("\t\tpublic " + parms[i].CSType + " " + parms[i].StudlyName + "{");
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if (parms[i].PassAs != "out") {
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sw.WriteLine ("\t\t\tget {");
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sw.WriteLine ("\t\t\t\treturn (" + parms[i].CSType + ") Args[" + i + "];");
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sw.WriteLine ("\t\t\t}");
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}
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if (parms[i].PassAs != "") {
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sw.WriteLine ("\t\t\tset {");
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sw.WriteLine ("\t\t\t\tArgs[" + i + "] = (" + parms[i].CSType + ")value;");
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sw.WriteLine ("\t\t\t}");
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}
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sw.WriteLine ("\t\t}");
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sw.WriteLine ();
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}
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sw.WriteLine ("\t}");
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sw.WriteLine ("}");
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sw.Close ();
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}
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public void GenEvent (StreamWriter sw, ObjectBase implementor, string target)
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{
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string args_type = IsEventHandler ? "" : ", typeof (" + EventArgsQualifiedName + ")";
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if (Marshaled) {
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GenCallback (sw);
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args_type = ", new " + DelegateName + "(" + CallbackName + ")";
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}
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sw.WriteLine("\t\t[Gst.GLib.Signal("+ CName + ")]");
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sw.Write("\t\tpublic ");
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if (NeedNew (implementor))
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sw.Write("new ");
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sw.WriteLine("event " + EventHandlerQualifiedName + " " + Name + " {");
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sw.WriteLine("\t\t\tadd {");
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sw.WriteLine("\t\t\t\tGst.GLib.Signal sig = Gst.GLib.Signal.Lookup (" + target + ", " + CName + args_type + ");");
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sw.WriteLine("\t\t\t\tsig.AddDelegate (value);");
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sw.WriteLine("\t\t\t}");
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sw.WriteLine("\t\t\tremove {");
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sw.WriteLine("\t\t\t\tGst.GLib.Signal sig = Gst.GLib.Signal.Lookup (" + target + ", " + CName + args_type + ");");
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sw.WriteLine("\t\t\t\tsig.RemoveDelegate (value);");
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sw.WriteLine("\t\t\t}");
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sw.WriteLine("\t\t}");
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sw.WriteLine();
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}
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public void Generate (GenerationInfo gen_info, ObjectBase implementor)
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{
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StreamWriter sw = gen_info.Writer;
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if (implementor == null)
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GenEventHandler (gen_info);
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GenEvent (sw, implementor, "this");
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Statistics.SignalCount++;
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}
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}
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}
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