# Module of TWiki Enterprise Collaboration Platform, http://TWiki.org/
#
# Copyright (C) 2005-2018 Peter Thoeny, peter[at]thoeny.org
# and TWiki Contributors. All Rights Reserved. TWiki Contributors
# are listed in the AUTHORS file in the root of this distribution.
# NOTE: Please extend that file, not this notice.
#
# Additional copyrights apply to some or all of the code in this
# file as follows:
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 3
# of the License, or (at your option) any later version. For
# more details read LICENSE in the root of this distribution.
#
# This program 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.
#
# As per the GPL, removal of this notice is prohibited.
#
# Author: Crawford Currie http://c-dot.co.uk

=pod

---+ package TWiki::If::Parser

Support for the conditions in %IF{} statements.

=cut

package TWiki::If::Parser;
use base 'TWiki::Query::Parser';

use strict;
use Assert;
use TWiki::If::Node;

sub new {
    my( $class ) = @_;

    my $this = $class->SUPER::new({
        nodeClass => 'TWiki::If::Node',
        words => qr/([A-Z][A-Z0-9_:]*|(\{[A-Z0-9_]+\})+)/i});
    die "{Operators}{If} is undefined; re-run configure"
      unless defined( $TWiki::cfg{Operators}{If} );
    foreach my $op (@{$TWiki::cfg{Operators}{If}}) {
        eval "require $op";
        ASSERT(!$@) if DEBUG;
        $this->addOperator($op->new());
    }

    return $this;
}

1;