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/* valaexpressionstatement.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>
*/
/**
* 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;
}
private set {
_expression = value;
_expression.parent_node = this;
}
}
private Expression _expression;
/**
* Creates a new expression statement.
*
* @param expression expression to evaluate
* @param source_reference 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;
}
}
public override bool check (CodeContext context) {
if (checked) {
return !error;
}
checked = true;
if (!expression.check (context)) {
// ignore inner error
error = true;
return false;
} else if (expression is Literal) {
Report.error (source_reference, "Literal expression not allowed as statement");
error = true;
return false;
}
return !error;
}
public override void get_error_types (Collection<DataType> collection, SourceReference? source_reference = null) {
expression.get_error_types (collection, source_reference);
}
public override void emit (CodeGenerator codegen) {
expression.emit (codegen);
codegen.visit_expression_statement (this);
}
public override void get_defined_variables (Collection<Variable> collection) {
expression.get_defined_variables (collection);
}
public override void get_used_variables (Collection<Variable> collection) {
expression.get_used_variables (collection);
}
}
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