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/* valacallback.vala
*
* Copyright (C) 2006-2007 Jürg Billeter
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
* This library 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
* Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Author:
* Jürg Billeter <j@bitron.ch>
*/
using GLib;
using Gee;
/**
* Represents a function callback type.
*/
public class Vala.Callback : DataType {
/**
* The return type of this callback.
*/
public TypeReference return_type { get; set; }
/**
* Specifies whether callback supports calling instance methods.
* The reference to the object instance will be appended to the end of
* the argument list in the generated C code.
*/
public bool instance { get; set; }
private Gee.List<TypeParameter> type_parameters = new ArrayList<TypeParameter> ();
private Gee.List<FormalParameter> parameters = new ArrayList<FormalParameter> ();
private string cname;
/**
* Creates a new callback.
*
* @param name callback type name
* @param return_type return type
* @param source reference to source code
* @return newly created callback
*/
public Callback (construct string name, construct TypeReference return_type, construct SourceReference source_reference = null) {
}
/**
* Appends the specified parameter to the list of type parameters.
*
* @param p a type parameter
*/
public void add_type_parameter (TypeParameter! p) {
type_parameters.add (p);
p.type = this;
scope.add (p.name, p);
}
/**
* Appends paramater to this callback function.
*
* @param param a formal parameter
*/
public void add_parameter (FormalParameter! param) {
parameters.add (param);
scope.add (param.name, param);
}
/**
* Return copy of parameter list.
*
* @return parameter list
*/
public Collection<FormalParameter> get_parameters () {
return new ReadOnlyCollection<FormalParameter> (parameters);
}
/**
* Checks whether the arguments and return type of the specified method
* matches this callback.
*
* @param m a method
* @return true if the specified method is compatible to this callback
*/
public bool matches_method (Method! m) {
if (!m.return_type.stricter (return_type)) {
return false;
}
var method_params = m.get_parameters ();
Iterator<FormalParameter> method_params_it = method_params.iterator ();
bool first = true;
foreach (FormalParameter param in parameters) {
/* use first callback parameter as instance parameter if
* an instance method is being compared to a static
* callback
*/
if (first && m.instance && !instance) {
first = false;
continue;
}
/* method is allowed to accept less arguments */
if (!method_params_it.next ()) {
break;
}
var method_param = method_params_it.get ();
if (!param.type_reference.stricter (method_param.type_reference)) {
return false;
}
}
/* method may not expect more arguments */
if (method_params_it.next ()) {
return false;
}
return true;
}
public override void accept (CodeVisitor! visitor) {
visitor.visit_callback (this);
}
public override void accept_children (CodeVisitor! visitor) {
foreach (TypeParameter p in type_parameters) {
p.accept (visitor);
}
return_type.accept (visitor);
foreach (FormalParameter! param in parameters) {
param.accept (visitor);
}
}
public override string get_cname (bool const_type = false) {
if (cname == null) {
cname = "%s%s".printf (parent_symbol.get_cprefix (), name);
}
return cname;
}
/**
* Sets the name of this callback as it is used in C code.
*
* @param cname the name to be used in C code
*/
public void set_cname (string cname) {
this.cname = cname;
}
private void process_ccode_attribute (Attribute a) {
if (a.has_argument ("cname")) {
set_cname (a.get_string ("cname"));
}
}
/**
* Process all associated attributes.
*/
public void process_attributes () {
foreach (Attribute a in attributes) {
if (a.name == "CCode") {
process_ccode_attribute (a);
}
}
}
public override bool is_reference_type () {
return false;
}
public override string get_type_id () {
return "G_TYPE_POINTER";
}
public override string get_marshaller_type_name () {
return "POINTER";
}
public override string get_get_value_function () {
return "g_value_get_pointer";
}
public override string get_set_value_function () {
return "g_value_set_pointer";
}
}
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