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#!perl
# Copyright 2022 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 Leo logic for unit rule.
use 5.010001;
use strict;
use warnings;
use List::Util;
use Test::More tests => 7;
use lib 'inc';
use Marpa::R2::Test;
use Marpa::R2;
## no critic (Subroutines::RequireArgUnpacking)
sub main::default_action {
shift;
return ( join q{}, grep {defined} @_ );
}
## use critic
my $grammar = Marpa::R2::Grammar->new(
{ start => 'A',
rules => [
[ 'A', [qw/a B/] ],
[ 'B', [qw/C/] ],
[ 'C', [qw/c A/] ],
[ 'C', [qw/c/] ],
],
terminals => [qw(a c)],
default_action => 'main::default_action',
}
);
$grammar->precompute();
Marpa::R2::Test::is( $grammar->show_symbols(),
<<'END_OF_STRING', 'Leo166 Symbols' );
0: a, terminal
1: c, terminal
2: A
3: B
4: C
END_OF_STRING
Marpa::R2::Test::is( $grammar->show_rules,
<<'END_OF_STRING', 'Leo166 Rules' );
0: A -> a B
1: B -> C
2: C -> c A
3: C -> c
END_OF_STRING
Marpa::R2::Test::is( $grammar->show_ahms, <<'END_OF_STRING', 'Leo166 AHMs' );
AHM 0: postdot = "a"
A ::= . a B
AHM 1: postdot = "B"
A ::= a . B
AHM 2: completion
A ::= a B .
AHM 3: postdot = "C"
B ::= . C
AHM 4: completion
B ::= C .
AHM 5: postdot = "c"
C ::= . c A
AHM 6: postdot = "A"
C ::= c . A
AHM 7: completion
C ::= c A .
AHM 8: postdot = "c"
C ::= . c
AHM 9: completion
C ::= c .
AHM 10: postdot = "A"
A['] ::= . A
AHM 11: completion
A['] ::= A .
END_OF_STRING
my $input = 'acacac';
my $length_of_input = length $input;
LEO_FLAG: for my $leo_flag ( 0, 1 ) {
my $recce = Marpa::R2::Recognizer->new(
{ grammar => $grammar, leo => $leo_flag } );
my $i = 0;
my $latest_earley_set = $recce->latest_earley_set();
my @sizes = ($recce->earley_set_size($latest_earley_set));
TOKEN: for ( my $i = 0; $i < $length_of_input; $i++ ) {
my $token_name = substr( $input, $i, 1 );
# token name and value are the same
$recce->read( $token_name, $token_name );
$latest_earley_set = $recce->latest_earley_set();
push @sizes, $recce->earley_set_size($latest_earley_set);
} ## end TOKEN: for ( my $i = 0; $i < $length_of_input; $i++ )
my $max_size = List::Util::max(@sizes);
my $expected_size = $leo_flag ? 5 : ( $length_of_input / 2 ) * 3 + 3;
Marpa::R2::Test::is( $max_size, $expected_size,
"Leo flag $leo_flag, size was $max_size but $expected_size was expected" );
my $value_ref = $recce->value();
my $value = $value_ref ? ${$value_ref} : 'No parse';
Marpa::R2::Test::is( $value, 'acacac', 'Leo unit rule parse' );
} ## end LEO_FLAG: for my $leo_flag ( 0, 1 )
# vim: expandtab shiftwidth=4:
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