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/* valapropertyaccessor.vala
*
* Copyright (C) 2006-2010 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;
/**
* Represents a get or set accessor of a property in the source code.
*/
public class Vala.PropertyAccessor : Subroutine {
/**
* The corresponding property.
*/
public Property prop {
get { return parent_symbol as Property; }
}
/**
* The property type.
*/
public DataType? value_type {
get { return _value_type; }
private set {
_value_type = value;
if (value != null) {
_value_type.parent_node = this;
}
}
}
/**
* Specifies whether this accessor may be used to get the property.
*/
public bool readable { get; private set; }
/**
* Specifies whether this accessor may be used to set the property.
*/
public bool writable { get; private set; }
/**
* Specifies whether this accessor may be used to construct the
* property.
*/
public bool construction { get; private set; }
/**
* True if the body was automatically generated
*/
public bool automatic_body { get; private set; }
public override bool has_result {
get { return readable; }
}
/**
* Represents the generated value parameter in a set accessor.
*/
public Parameter value_parameter { get; private set; }
private DataType _value_type;
/**
* Creates a new property accessor.
*
* @param readable true if get accessor, false otherwise
* @param writable true if set accessor, false otherwise
* @param construction true if construct accessor, false otherwise
* @param body accessor body
* @param source_reference reference to source code
* @return newly created property accessor
*/
public PropertyAccessor (bool readable, bool writable, bool construction, DataType? value_type, Block? body, SourceReference? source_reference, Comment? comment = null) {
base (null, source_reference, comment);
this.readable = readable;
this.writable = writable;
this.construction = construction;
this.value_type = value_type;
this.body = body;
this.access = SymbolAccessibility.PUBLIC;
}
public override void accept (CodeVisitor visitor) {
visitor.visit_property_accessor (this);
}
public override void accept_children (CodeVisitor visitor) {
value_type.accept (visitor);
if (result_var != null) {
result_var.accept (visitor);
}
if (body != null) {
body.accept (visitor);
}
}
/**
* Get the method representing this property accessor
* @return null if the accessor is neither readable nor writable
*/
public Method? get_method () {
Method? m = null;
if (readable) {
m = new Method ("get_%s".printf (prop.name), value_type, source_reference, comment);
} else if (writable) {
m = new Method ("set_%s".printf (prop.name), new VoidType(), source_reference, comment);
m.add_parameter (value_parameter.copy ());
}
if (m != null) {
m.owner = prop.owner;
m.access = access;
m.binding = prop.binding;
m.is_abstract = prop.is_abstract;
m.is_virtual = prop.is_virtual;
}
return m;
}
public override bool check (CodeContext context) {
if (checked) {
return !error;
}
checked = true;
if (!value_type.check (context)) {
error = true;
return false;
}
var old_symbol = context.analyzer.current_symbol;
context.analyzer.current_symbol = this;
if (writable || construction) {
value_parameter = new Parameter ("value", value_type, source_reference);
}
if (prop.source_type == SourceFileType.SOURCE) {
if (body == null && !prop.interface_only && !prop.is_abstract) {
/* no accessor body specified, insert default body */
automatic_body = true;
body = new Block (source_reference);
var ma = new MemberAccess.simple ("_%s".printf (prop.name), source_reference);
if (readable) {
body.add_statement (new ReturnStatement (ma, source_reference));
} else {
Expression value = new MemberAccess.simple ("value", source_reference);
if (value_type.value_owned) {
value = new ReferenceTransferExpression (value, source_reference);
}
var assignment = new Assignment (ma, value, AssignmentOperator.SIMPLE, source_reference);
body.add_statement (new ExpressionStatement (assignment));
}
}
}
if ((prop.is_abstract || prop.is_virtual || prop.overrides) && access == SymbolAccessibility.PRIVATE) {
error = true;
Report.error (source_reference, "Property `%s' with private accessor cannot be marked as abstract, virtual or override".printf (prop.get_full_name ()));
return false;
}
if (body != null) {
if (writable || construction) {
body.scope.add (value_parameter.name, value_parameter);
}
body.check (context);
foreach (DataType body_error_type in body.get_error_types ()) {
if (!((ErrorType) body_error_type).dynamic_error) {
Report.warning (body_error_type.source_reference, "unhandled error `%s'".printf (body_error_type.to_string()));
}
}
}
context.analyzer.current_symbol = old_symbol;
return !error;
}
public override void replace_type (DataType old_type, DataType new_type) {
if (value_type == old_type) {
value_type = new_type;
}
}
}
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