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/* valaexpressionstatement.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 Gee;
/**
* A code statement that evaluates a given expression. The value computed by the
* expression, if any, is discarded.
*/
public class Vala.ExpressionStatement : CodeNode, Statement {
/**
* Specifies the expression to evaluate.
*/
public Expression expression {
get {
return _expression;
}
set {
_expression = value;
_expression.parent_node = this;
}
}
private Expression _expression;
/**
* Creates a new expression statement.
*
* @param expr expression to evaluate
* @param source reference to source code
* @return newly created expression statement
*/
public ExpressionStatement (Expression expression, SourceReference? source_reference = null) {
this.source_reference = source_reference;
this.expression = expression;
}
public override void accept (CodeVisitor visitor) {
visitor.visit_expression_statement (this);
}
public override void accept_children (CodeVisitor visitor) {
expression.accept (visitor);
}
public override void replace_expression (Expression old_node, Expression new_node) {
if (expression == old_node) {
expression = new_node;
}
}
/**
* Returns the property this statement sets, if any.
*
* @return the property this statement sets, or null if it doesn't set
* a property
*/
public Property? assigned_property () {
if (expression is Assignment) {
var assign = (Assignment) expression;
if (assign.left is MemberAccess) {
var ma = (MemberAccess) assign.left;
if (ma.symbol_reference is Property) {
return (Property) ma.symbol_reference;
}
}
}
return null;
}
public override bool check (SemanticAnalyzer analyzer) {
if (checked) {
return !error;
}
checked = true;
if (!expression.check (analyzer)) {
// ignore inner error
error = true;
return false;
}
add_error_types (expression.get_error_types ());
return !error;
}
public override void get_defined_variables (Collection<LocalVariable> collection) {
expression.get_defined_variables (collection);
}
public override void get_used_variables (Collection<LocalVariable> collection) {
expression.get_used_variables (collection);
}
}
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