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/* manyrule.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.ManyRule : Rule {
public ManyRule (Object scheme) {
_scheme = scheme;
}
private Object _scheme;
private class State : Object {
public bool started = false;
public bool done_one = false;
}
public override bool is_optional () {
return is_optional_rule (_scheme);
}
public override bool starts_with_token (Token token) {
if (has_start_token (_scheme, token)) {
return true;
}
return false;
}
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;
}
if (state.done_one && parser.would_parent_accept_token (token)) {
do_reduce (parser);
return false;
}
if (parser.would_parent_reduce_to_rule (token, this)) {
do_reduce (parser);
return false;
}
bool handled;
if (try_to_apply (_scheme, token, parser, out handled)) {
state.done_one = true;
return handled;
}
if (parser.would_parent_accept_token (token)) {
do_reduce (parser);
return false;
}
if (_scheme is TokenType) {
parser.error (null, "expected %s".printf (((TokenType) _scheme).to_pretty_string ()));
} else {
parser.error (token, "unexpected token");
}
assert_not_reached ();
}
public override bool would_accept_token (Token token, Object? state) {
if (has_start_token (_scheme, token)) {
return true;
}
return false;
}
public override bool would_reduce (Token token, Object? rule_state) {
var state = rule_state as State;
return state.done_one || is_optional_rule (_scheme);
}
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;done_one=%s)".printf (name != null ? name : " ",
"[many]",
state.started.to_string (),
state.done_one.to_string ());
}
}
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