mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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315 lines
9.1 KiB
C#
315 lines
9.1 KiB
C#
// ObjectBase.cs - Base class for Object types
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//
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// Authors: Mike Kestner <mkestner@novell.com>
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//
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// Copyright (c) 2005 Novell, Inc.
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// Copyright (c) 2009 Christian Hoff
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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 abstract class ObjectBase : HandleBase {
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bool is_interface;
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protected string class_struct_name = null;
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bool class_fields_valid; // false if the class structure contains a bitfield or fields of unknown types
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ArrayList class_members = new ArrayList ();
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protected ArrayList class_fields = new ArrayList ();
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// The default handlers of these signals need to be overridden with g_signal_override_class_closure
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protected ArrayList virtual_methods = new ArrayList ();
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// virtual methods that are generated as an IntPtr in the class struct
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protected ArrayList hidden_vms = new ArrayList ();
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protected ArrayList interface_vms = new ArrayList ();
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protected Hashtable sigs = new Hashtable();
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protected ObjectBase (XmlElement ns, XmlElement elem, bool is_interface) : base (ns, elem)
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{
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this.is_interface = is_interface;
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XmlElement class_elem = null;
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Hashtable vms = new Hashtable ();
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Hashtable signal_vms = new Hashtable ();
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if (this.ParserVersion == 1)
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class_struct_name = this.CName + (is_interface ? "Iface" : "Class");
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foreach (XmlNode node in elem.ChildNodes) {
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if (!(node is XmlElement)) continue;
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XmlElement member = node as XmlElement;
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switch (node.Name) {
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case "virtual_method":
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if (this.ParserVersion == 1) {
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if (is_interface) // Generating non-signal GObject virtual methods is not supported in compatibility mode
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AddVM (member, false, is_interface);
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} else
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vms.Add (member.GetAttribute ("cname"), member);
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break;
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case "signal":
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if (this.ParserVersion == 1 || member.GetAttribute ("field_name") == "")
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AddVM (member, true, is_interface);
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else
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signal_vms.Add (member.GetAttribute ("field_name"), member);
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if (member.GetAttribute ("hidden") != "1") {
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string name = member.GetAttribute("name");
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while (sigs.ContainsKey(name))
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name += "mangled";
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sigs.Add (name, new Signal (member, this));
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}
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break;
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case "class_struct":
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class_elem = member;
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break;
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}
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}
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if (class_elem == null) return;
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class_struct_name = class_elem.GetAttribute ("cname");
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for (int node_idx = 0; node_idx < class_elem.ChildNodes.Count; node_idx++) {
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XmlNode node = class_elem.ChildNodes [node_idx];
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if (!(node is XmlElement)) continue;
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XmlElement member = (XmlElement) node;
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switch (member.Name) {
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case "method":
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string vm_name;
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XmlElement vm_elem;
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bool is_signal_vm = member.HasAttribute ("signal_vm");
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if (is_signal_vm) {
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vm_name = member.GetAttribute ("signal_vm");
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vm_elem = signal_vms [vm_name] as XmlElement;
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} else {
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vm_name = member.GetAttribute ("vm");
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vm_elem = vms [vm_name] as XmlElement;
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}
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AddVM (vm_elem, is_signal_vm, is_interface);
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break;
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case "field":
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if (node_idx == 0) continue; // Parent class
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ClassField field = new ClassField (member, this);
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class_fields.Add (field);
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class_members.Add (field);
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break;
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default:
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Console.WriteLine ("Unexpected node " + member.Name + " in " + class_elem.GetAttribute ("cname"));
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break;
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}
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}
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}
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VirtualMethod AddVM (XmlElement vm_elem, bool is_signal_vm, bool is_interface)
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{
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VirtualMethod vm;
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if (is_signal_vm)
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vm = new DefaultSignalHandler (vm_elem, this);
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else if (is_interface)
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vm = new InterfaceVM (vm_elem, methods [vm_elem.GetAttribute ("name")] as Method, this);
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else
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vm = new GObjectVM (vm_elem, this);
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if (vm_elem.GetAttribute ("padding") == "true" || vm_elem.GetAttribute ("hidden") == "1")
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hidden_vms.Add (vm);
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else {
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if (vm is GObjectVM)
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virtual_methods.Add (vm);
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else
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interface_vms.Add (vm);
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}
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if (vm.CName != "")
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class_members.Add (vm);
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return vm;
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}
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protected override bool IsNodeNameHandled (string name)
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{
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switch (name) {
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case "virtual_method":
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case "signal":
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case "class_struct":
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return true;
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default:
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return base.IsNodeNameHandled (name);
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}
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}
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public override string FromNative (string var, bool owned)
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{
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return "GLib.Object.GetObject(" + var + (owned ? ", true" : "") + ") as " + QualifiedName;
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}
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public string ClassStructName {
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get {
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return class_struct_name;
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}
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}
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public bool CanGenerateClassStruct {
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get {
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/* Generation of interface class structs was already supported by version 2.12 of the GAPI parser. Their layout was determined by the order
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* in which the signal and virtual_method elements appeared in the XML. However, we cannot use that approach for old GObject class structs
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* as they may contain class fields which don't appear in the old (version 1) API files. There are also cases in which the order of the
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* <signal> and <virtual_method> elements do not match the struct layout.
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*/
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return (is_interface || this.ParserVersion >= 2) && class_fields_valid;
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}
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}
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protected void GenerateClassStruct (GenerationInfo gen_info)
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{
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if (class_struct_name == null || !CanGenerateClassStruct) return;
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StreamWriter sw = gen_info.Writer;
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sw.WriteLine ("\t\t[StructLayout (LayoutKind.Sequential)]");
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sw.WriteLine ("\t\tstruct " + class_struct_name + " {");
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foreach (object member in class_members) {
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if (member is VirtualMethod) {
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VirtualMethod vm = member as VirtualMethod;
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if (hidden_vms.Contains (vm) || (is_interface && vm is DefaultSignalHandler))
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sw.WriteLine ("\t\t\tIntPtr {0};", vm.Name);
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else
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sw.WriteLine ("\t\t\tpublic {0}NativeDelegate {0};", vm.Name);
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} else if (member is ClassField) {
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ClassField field = member as ClassField;
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field.Generate (gen_info, "\t\t\t");
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}
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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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public Hashtable Signals {
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get {
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return sigs;
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}
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}
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public Signal GetSignal (string name)
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{
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return sigs[name] as Signal;
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}
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public Signal GetSignalRecursively (string name)
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{
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return GetSignalRecursively (name, false);
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}
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public virtual Signal GetSignalRecursively (string name, bool check_self)
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{
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Signal p = null;
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if (check_self)
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p = GetSignal (name);
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if (p == null && Parent != null)
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p = (Parent as ObjectBase).GetSignalRecursively (name, true);
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if (check_self && p == null) {
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foreach (string iface in interfaces) {
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InterfaceGen igen = SymbolTable.Table.GetClassGen (iface) as InterfaceGen;
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if (igen == null)
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continue;
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p = igen.GetSignalRecursively (name, true);
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if (p != null)
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break;
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}
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}
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return p;
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}
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public void GenSignals (GenerationInfo gen_info, ObjectBase implementor)
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{
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foreach (Signal sig in sigs.Values)
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sig.Generate (gen_info, implementor);
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}
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public void GenVirtualMethods (GenerationInfo gen_info, ObjectBase implementor)
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{
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foreach (GObjectVM vm in virtual_methods)
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vm.Generate (gen_info, implementor);
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}
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public override bool Validate ()
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{
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if (Parent != null && !(Parent as ObjectBase).ValidateForSubclass ())
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return false;
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ArrayList invalids = new ArrayList ();
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foreach (GObjectVM vm in virtual_methods)
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if (!vm.Validate ())
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invalids.Add (vm);
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foreach (VirtualMethod invalid_vm in invalids) {
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virtual_methods.Remove (invalid_vm);
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hidden_vms.Add (invalid_vm);
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}
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invalids.Clear ();
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class_fields_valid = true;
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foreach (ClassField field in class_fields)
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if (!field.Validate ())
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class_fields_valid = false;
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foreach (InterfaceVM vm in interface_vms)
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if (!vm.Validate ())
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invalids.Add (vm);
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foreach (InterfaceVM invalid_vm in invalids) {
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interface_vms.Remove (invalid_vm);
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hidden_vms.Add (invalid_vm);
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}
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invalids.Clear ();
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foreach (Signal sig in sigs.Values) {
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if (!sig.Validate ()) {
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Console.WriteLine ("in type " + QualifiedName);
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invalids.Add (sig);
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}
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}
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foreach (Signal sig in invalids)
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sigs.Remove (sig.Name);
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return base.Validate ();
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}
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public virtual bool ValidateForSubclass ()
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{
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ArrayList invalids = new ArrayList ();
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foreach (Signal sig in sigs.Values) {
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if (!sig.Validate ()) {
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Console.WriteLine ("in type " + QualifiedName);
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invalids.Add (sig);
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}
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}
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foreach (Signal sig in invalids)
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sigs.Remove (sig.Name);
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invalids.Clear ();
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return true;
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}
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}
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}
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