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/* valacatchclause.vala
*
* Copyright (C) 2007-2010 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>
*/
/**
* Represents a catch clause in a try statement in the source code.
*/
public class Vala.CatchClause : CodeNode {
/**
* Specifies the error type.
*/
public DataType? error_type {
get { return _data_type; }
private set {
_data_type = value;
if (_data_type != null) {
_data_type.parent_node = this;
}
}
}
/**
* Specifies the error variable name.
*/
public string? variable_name { get; private set; }
/**
* Specifies the error handler body.
*/
public Block body {
get { return _body; }
private set {
_body = value;
_body.parent_node = this;
}
}
/**
* Specifies the declarator for the generated error variable.
*/
public LocalVariable error_variable {
get { return _error_variable; }
private set {
_error_variable = value;
_error_variable.parent_node = this;
}
}
private DataType _data_type;
private Block _body;
private LocalVariable _error_variable;
/**
* Creates a new catch
*
* @param error_type error type
* @param variable_name error variable name
* @param body error handler body
* @param source_reference reference to source code
* @return newly created catch clause
*/
public CatchClause (DataType? error_type, string? variable_name, Block body, SourceReference? source_reference = null) {
this.error_type = error_type;
this.variable_name = variable_name;
this.body = body;
this.source_reference = source_reference;
}
public override void accept (CodeVisitor visitor) {
visitor.visit_catch_clause (this);
}
public override void accept_children (CodeVisitor visitor) {
if (error_type != null) {
error_type.accept (visitor);
}
body.accept (visitor);
}
public override void replace_type (DataType old_type, DataType new_type) {
if (error_type == old_type) {
error_type = new_type;
}
}
public override bool check (CodeContext context) {
if (checked) {
return !error;
}
checked = true;
if (context.profile == Profile.POSIX) {
Report.error (source_reference, "`catch' is not supported in POSIX profile");
error = true;
return false;
}
if (error_type != null) {
if (!(error_type is ErrorType)) {
Report.error (source_reference, "clause must catch a valid error type, found `%s' instead", error_type.to_string ());
error = true;
}
if (variable_name != null) {
error_variable = new LocalVariable (error_type.copy (), variable_name, null, source_reference);
body.scope.add (variable_name, error_variable);
body.add_local_variable (error_variable);
error_variable.checked = true;
}
} else {
// generic catch clause
error_type = new ErrorType (null, null, source_reference);
}
error_type.check (context);
body.check (context);
return !error;
}
public override void emit (CodeGenerator codegen) {
if (error_variable != null) {
error_variable.active = true;
}
codegen.visit_catch_clause (this);
}
public override void get_defined_variables (Collection<Variable> collection) {
if (error_variable != null) {
collection.add (error_variable);
}
}
}
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