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/* optionalrule.vala
*
* Copyright (C) 2008-2009 Florian Brosch, Didier Villevalois
*
* 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:
* Didier 'Ptitjes Villevalois <ptitjes@free.fr>
*/
internal class Valadoc.OptionalRule : Rule {
public OptionalRule (Object scheme) {
_scheme = scheme;
}
private Object _scheme;
private class State : Object {
public bool started = false;
}
public override bool is_optional () {
return true;
}
public override bool starts_with_token (Token token) {
return has_start_token (_scheme, token);
}
public override bool accept_token (Token token, ParserCallback parser, Rule.Forward forward)
throws ParserError
{
var state = parser.get_rule_state () as State;
if (state == null) {
state = new State ();
parser.set_rule_state (state);
}
if (!state.started) {
do_start (parser);
state.started = true;
bool handled;
if (try_to_apply (_scheme, token, parser, out handled)) {
return handled;
} else {
do_skip (parser);
return false;
}
} else {
do_reduce (parser);
return false;
}
}
public override bool would_accept_token (Token token, Object? state) {
return false;
}
public override bool would_reduce (Token token, Object? state) {
return true;
}
public override string to_string (Object? rule_state) {
var state = rule_state as State;
if (state == null) {
state = new State ();
}
return "%-15s%-15s(started=%s)".printf (name != null ? name : " ",
"[option]",
state.started.to_string ());
}
}
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