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// GtkSharp.Generation.ReturnValue.cs - The ReturnValue Generatable.
//
// Author: Mike Kestner <mkestner@novell.com>
//
// Copyright (c) 2004-2005 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.Xml;
public class ReturnValue {
bool is_null_term;
bool is_array;
bool elements_owned;
bool owned;
string array_length_param = String.Empty;
int array_length_param_index = -1;
string ctype = String.Empty;
string default_value = String.Empty;
string element_ctype = String.Empty;
Parameter count_param;
public ReturnValue (XmlElement elem)
{
if (elem != null) {
is_null_term = elem.GetAttributeAsBoolean ("null_term_array");
is_array = elem.GetAttributeAsBoolean ("array") || elem.HasAttribute ("array_length_param");
array_length_param = elem.GetAttribute ("array_length_param");
if (elem.HasAttribute ("array_length_param_length"))
array_length_param_index = int.Parse (elem.GetAttribute ("array_length_param_index"));
elements_owned = elem.GetAttributeAsBoolean ("elements_owned");
owned = elem.GetAttributeAsBoolean ("owned");
ctype = elem.GetAttribute("type");
default_value = elem.GetAttribute ("default_value");
element_ctype = elem.GetAttribute ("element_type");
}
}
public Parameter CountParameter {
get { return count_param; }
set { count_param = value; }
}
public string CountParameterName {
get { return array_length_param; }
}
public int CountParameterIndex {
get { return array_length_param_index; }
}
public string CType {
get {
return ctype;
}
}
public string CSType {
get {
if (IGen == null)
return String.Empty;
if (ElementType != String.Empty)
return ElementType + "[]";
return IGen.QualifiedName + (is_array || is_null_term ? "[]" : String.Empty);
}
}
public string DefaultValue {
get {
if (!String.IsNullOrEmpty (default_value))
return default_value;
if (IGen == null)
return String.Empty;
return IGen.DefaultValue;
}
}
string ElementType {
get {
if (element_ctype.Length > 0)
return SymbolTable.Table.GetCSType (element_ctype);
return String.Empty;
}
}
IGeneratable igen;
public IGeneratable IGen {
get {
if (igen == null)
igen = SymbolTable.Table [CType];
return igen;
}
}
public bool IsVoid {
get {
return CSType == "void";
}
}
public string MarshalType {
get {
if (IGen == null)
return String.Empty;
else if (is_array || is_null_term)
return "IntPtr";
return IGen.MarshalType;
}
}
public string ToNativeType {
get {
if (IGen == null)
return String.Empty;
if (is_array || is_null_term)
return "IntPtr";
return IGen.MarshalType;
}
}
public string FromNative (string var)
{
if (IGen == null)
return String.Empty;
if (ElementType != String.Empty) {
string args = (owned ? "true" : "false") + ", " + (elements_owned ? "true" : "false");
if (IGen.QualifiedName == "GLib.PtrArray")
return String.Format ("({0}[]) GLib.Marshaller.PtrArrayToArray ({1}, {2}, typeof({0}))", ElementType, var, args);
else
return String.Format ("({0}[]) GLib.Marshaller.ListPtrToArray ({1}, typeof({2}), {3}, typeof({4}))", ElementType, var, IGen.QualifiedName, args, element_ctype == "gfilename*" ? "GLib.ListBase.FilenameString" : ElementType);
} else if (IGen is IOwnable)
return ((IOwnable)IGen).FromNative (var, owned);
else if (is_null_term)
return String.Format ("GLib.Marshaller.NullTermPtrToStringArray ({0}, {1})", var, owned ? "true" : "false");
else if (is_array)
return String.Format ("({0}) GLib.Marshaller.ArrayPtrToArray ({1}, typeof ({2}), (int){3}native_{4}, true)", CSType, var, IGen.QualifiedName, CountParameter.CSType == "int" ? String.Empty : "(" + CountParameter.CSType + ")", CountParameter.Name);
else
return IGen.FromNative (var);
}
public string ToNative (string var)
{
if (IGen == null)
return String.Empty;
if (ElementType.Length > 0) {
string args = ", typeof (" + ElementType + "), " + (owned ? "true" : "false") + ", " + (elements_owned ? "true" : "false");
var = "new " + IGen.QualifiedName + "(" + var + args + ")";
} else if (is_null_term)
return String.Format ("GLib.Marshaller.StringArrayToNullTermStrvPointer ({0})", var);
else if (is_array)
return String.Format ("GLib.Marshaller.ArrayToArrayPtr ({0})", var);
if (IGen is IManualMarshaler)
return (IGen as IManualMarshaler).AllocNative (var);
else if (IGen is ObjectGen && owned)
return var + " == null ? IntPtr.Zero : " + var + ".OwnedHandle";
else if (IGen is OpaqueGen && owned)
return var + " == null ? IntPtr.Zero : " + var + ".OwnedCopy";
else
return IGen.CallByName (var);
}
public bool Validate (LogWriter log)
{
if (MarshalType == "" || CSType == "") {
log.Warn ("Unknown return type: {0}", CType);
return false;
} else if ((CSType == "GLib.List" || CSType == "GLib.SList") && String.IsNullOrEmpty (ElementType))
log.Warn ("Returns {0} with unknown element type. Add element_type attribute with gapi-fixup.", CType);
if (is_array && !is_null_term && String.IsNullOrEmpty (array_length_param)) {
log.Warn ("Returns an array with undeterminable length. Add null_term_array or array_length_param attribute with gapi-fixup.");
return false;
}
return true;
}
}
}
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