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/* valacallabletype.vala
*
* Copyright (C) 2017 Rico Tzschichholz
*
* 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:
* Rico Tzschichholz <ricotz@ubuntu.com>
*/
using GLib;
/**
* A callable type, i.e. a delegate, method, or signal type.
*/
public abstract class Vala.CallableType : DataType {
public weak Callable callable_symbol {
get {
return (Callable) symbol;
}
}
protected CallableType (Symbol symbol, SourceReference? source_reference = null) {
base.with_symbol (symbol, source_reference);
}
public override bool is_invokable () {
return true;
}
public override unowned DataType? get_return_type () {
return callable_symbol.return_type;
}
public override unowned List<Parameter>? get_parameters () {
return callable_symbol.get_parameters ();
}
public override string to_prototype_string (string? override_name = null) {
StringBuilder builder = new StringBuilder ();
unowned DelegateType? delegate_type = this as DelegateType;
unowned MethodType? method_type = this as MethodType;
unowned SignalType? signal_type = this as SignalType;
if (method_type != null && method_type.method_symbol.coroutine) {
// Only methods can be asynchronous
builder.append ("async ");
} else if (delegate_type != null) {
builder.append ("delegate ");
} else if (signal_type != null) {
builder.append ("signal ");
}
// Append return-type, but omit return-type for creation methods
if (method_type == null || !(method_type.method_symbol is CreationMethod)) {
builder.append (get_return_type ().to_prototype_string ());
}
// Append name
builder.append_c (' ');
builder.append (override_name ?? this.to_string ());
builder.append_c (' ');
// Append parameter-list
builder.append_c ('(');
int i = 1;
// add sender parameter for internal signal-delegates
if (delegate_type != null) {
unowned Delegate delegate_symbol = delegate_type.delegate_symbol;
if (delegate_symbol.parent_symbol is Signal && delegate_symbol.sender_type != null) {
builder.append (delegate_symbol.sender_type.to_qualified_string ());
i++;
}
}
foreach (Parameter param in get_parameters ()) {
if (i > 1) {
builder.append (", ");
}
if (param.ellipsis) {
builder.append ("...");
continue;
}
if (param.params_array) {
builder.append ("params ");
}
if (param.direction == ParameterDirection.IN) {
if (param.variable_type.value_owned) {
builder.append ("owned ");
}
} else {
if (param.direction == ParameterDirection.REF) {
builder.append ("ref ");
} else if (param.direction == ParameterDirection.OUT) {
builder.append ("out ");
}
if (!param.variable_type.value_owned && param.variable_type is ReferenceType) {
builder.append ("weak ");
}
}
builder.append (param.variable_type.to_qualified_string ());
if (param.initializer != null) {
builder.append (" = ");
builder.append (param.initializer.to_string ());
}
i++;
}
builder.append_c (')');
// Append error-types
var error_types = new ArrayList<DataType> ();
callable_symbol.get_error_types (error_types);
if (error_types.size > 0) {
builder.append (" throws ");
bool first = true;
foreach (DataType type in error_types) {
if (!first) {
builder.append (", ");
} else {
first = false;
}
builder.append (type.to_string ());
}
}
return builder.str;
}
}
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