#!perl
# Copyright 2014 Jeffrey Kegler
# This file is part of Marpa::R2. Marpa::R2 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 3 of the License, or (at your option) any later version.
#
# Marpa::R2 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 Marpa::R2. If not, see
# http://www.gnu.org/licenses/.
# Test of null ranking
use 5.010;
use strict;
use warnings;
use Test::More tests => 10;
use lib 'inc';
use Marpa::R2::Test;
use Marpa::R2;
## no critic (Subroutines::RequireArgUnpacking)
sub default_action {
shift;
my $v_count = scalar @_;
return q{} if $v_count <= 0;
return $_[0] if $v_count == 1;
return '(' . join( q{;}, @_ ) . ')';
} ## end sub default_action
## use critic
# Marpa::R2::Display
# name: null-ranking adverb example
my $high_dsl = <<'END_OF_DSL';
:default ::= action => main::default_action
:start ::= S
A ::= 'a'
A ::= empty
empty ::=
S ::= A A A A null-ranking => high
END_OF_DSL
# Marpa::R2::Display::End
my $low_dsl = $high_dsl;
$low_dsl =~ s/\s+ [=][>] \s+ high \Z/ => low/xms;
my %dsl = ( high => \$high_dsl, low => \$low_dsl );
my @maximal = ( q{}, qw[(a;;;) (a;a;;) (a;a;a;) (a;a;a;a)] );
my @minimal = ( q{}, qw[(;;;a) (;;a;a) (;a;a;a) (a;a;a;a)] );
for my $maximal ( 0, 1 ) {
my $dsl = $dsl{ $maximal ? 'low' : 'high' };
my $slg = Marpa::R2::Scanless::G->new( { source => $dsl } );
my $slr = Marpa::R2::Scanless::R->new(
{ grammar => $slg,
ranking_method => 'high_rule_only'
}
);
my $input_length = 4;
my $input = 'a' x $input_length;
$slr->read( \$input );
for my $i ( 0 .. $input_length ) {
my $expected = $maximal ? \@maximal : \@minimal;
my $name = $maximal ? 'maximal' : 'minimal';
# Marpa::R2::Display
# name: SLIF recognizer series_restart() synopsis
$slr->series_restart( { end => $i } );
# Marpa::R2::Display::End
# Marpa::R2::Display
# name: SLIF recognizer set() synopsis
$slr->set( { max_parses => 42 } );
# Marpa::R2::Display::End
my $result = $slr->value();
die "No parse" if not defined $result;
Test::More::is( ${$result}, $expected->[$i],
"$name parse, length=$i" );
} ## end for my $i ( 0 .. $input_length )
} ## end for my $maximal ( 0, 1 )
1; # In case used as "do" file
# Local Variables:
# mode: cperl
# cperl-indent-level: 4
# fill-column: 100
# End:
# vim: expandtab shiftwidth=4: