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/* valanullliteral.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 literal `null` in the source code.
*/
public class Vala.NullLiteral : Literal {
/**
* Creates a new null literal.
*
* @param source reference to source code
* @return newly created null literal
*/
public NullLiteral (SourceReference? source = null) {
source_reference = source;
}
public override void accept (CodeVisitor visitor) {
visitor.visit_null_literal (this);
visitor.visit_expression (this);
}
public override string to_string () {
return "null";
}
public override bool is_pure () {
return true;
}
public override bool check (SemanticAnalyzer analyzer) {
if (checked) {
return !error;
}
checked = true;
value_type = new NullType (source_reference);
return !error;
}
public override void emit (CodeGenerator codegen) {
codegen.visit_null_literal (this);
codegen.visit_expression (this);
}
}
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