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/* valasignal.vala
*
* Copyright (C) 2006-2008 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 2.1 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 an object signal. Signals enable objects to provide notifications.
*/
public class Vala.Signal : Member, Lockable {
/**
* The return type of handlers of this signal.
*/
public DataType return_type {
get { return _return_type; }
set {
_return_type = value;
_return_type.parent_node = this;
}
}
/**
* Specifies whether this signal has an emitter wrapper function.
*/
public bool has_emitter { get; set; }
/**
* Specifies whether this signal has virtual method handler.
*/
public bool is_virtual { get; set; }
private Gee.List<FormalParameter> parameters = new ArrayList<FormalParameter> ();
private Method generated_method;
private string cname;
private bool lock_used = false;
private DataType _return_type;
/**
* Creates a new signal.
*
* @param name signal name
* @param return_type signal return type
* @param source reference to source code
* @return newly created signal
*/
public Signal (string name, DataType return_type, SourceReference? source_reference = null) {
base (name, source_reference);
this.return_type = return_type;
}
/**
* Appends parameter to signal handler.
*
* @param param a formal parameter
*/
public void add_parameter (FormalParameter param) {
// default C parameter position
param.cparameter_position = parameters.size + 1;
param.carray_length_parameter_position = param.cparameter_position + 0.1;
param.cdelegate_target_parameter_position = param.cparameter_position + 0.1;
parameters.add (param);
scope.add (param.name, param);
}
public Gee.List<FormalParameter> get_parameters () {
return new ReadOnlyList<FormalParameter> (parameters);
}
/**
* Returns generated delegate to be used for signal handlers.
*
* @return delegate
*/
public Delegate get_delegate (DataType sender_type) {
var generated_delegate = new Delegate (null, return_type);
generated_delegate.has_target = true;
// sender parameter is never null and doesn't own its value
var sender_param_type = sender_type.copy ();
sender_param_type.value_owned = false;
sender_param_type.nullable = false;
var sender_param = new FormalParameter ("_sender", sender_param_type);
generated_delegate.add_parameter (sender_param);
foreach (FormalParameter param in parameters) {
generated_delegate.add_parameter (param.copy ());
}
scope.add (null, generated_delegate);
return generated_delegate;
}
/**
* Returns the name of this signal as it is used in C code.
*
* @return the name to be used in C code
*/
public string get_cname () {
if (cname == null) {
cname = camel_case_to_lower_case (name);
}
return cname;
}
public void set_cname (string cname) {
this.cname = cname;
}
/**
* Returns the string literal of this signal to be used in C code.
*
* @return string literal to be used in C code
*/
public CCodeConstant get_canonical_cconstant (string? detail = null) {
var str = new StringBuilder ("\"");
string i = get_cname ();
while (i.len () > 0) {
unichar c = i.get_char ();
if (c == '_') {
str.append_c ('-');
} else {
str.append_unichar (c);
}
i = i.next_char ();
}
if (detail != null) {
str.append ("::");
str.append (detail);
}
str.append_c ('"');
return new CCodeConstant (str.str);
}
public override void accept (CodeVisitor visitor) {
visitor.visit_member (this);
visitor.visit_signal (this);
}
public override void accept_children (CodeVisitor visitor) {
return_type.accept (visitor);
foreach (FormalParameter param in parameters) {
param.accept (visitor);
}
}
/**
* Process all associated attributes.
*/
public void process_attributes () {
foreach (Attribute a in attributes) {
if (a.name == "HasEmitter") {
has_emitter = true;
}
}
}
public bool get_lock_used () {
return lock_used;
}
public void set_lock_used (bool used) {
lock_used = used;
}
public override void replace_type (DataType old_type, DataType new_type) {
if (return_type == old_type) {
return_type = new_type;
}
}
public Method get_method_handler () {
assert (is_virtual);
if (generated_method == null) {
generated_method = new Method (name, return_type, source_reference);
generated_method.is_virtual = true;
generated_method.vfunc_name = name;
foreach (FormalParameter param in parameters) {
generated_method.add_parameter (param);
}
parent_symbol.scope.add (null, generated_method);
}
return generated_method;
}
}
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