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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/.
# Two rules which start with nullables, and cycle.
use 5.010001;
use strict;
use warnings;
use Test::More tests => 9;
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;
my @vals = map { $_ // q{-} } @_;
return $_[0] if scalar @vals == 1;
return '(' . join( q{;}, @vals ) . ')';
} ## end sub default_action
## use critic
my $grammar = Marpa::R2::Grammar->new(
{ start => 'S',
rules => [
[ 'S', [qw/p p p n/], ],
[ 'p', ['t'], ],
[ 'p', [], ],
[ 'n', ['t'], ],
[ 'n', ['r2'], ],
[ 'r2', [qw/a b c d e x/], ],
[ 'a', [] ],
[ 'b', [] ],
[ 'c', [] ],
[ 'd', [] ],
[ 'e', [] ],
[ 'a', ['t'] ],
[ 'b', ['t'] ],
[ 'c', ['t'] ],
[ 'd', ['t'] ],
[ 'e', ['t'] ],
[ 'x', ['t'], ],
],
terminals => ['t'],
default_action => 'main::default_action',
}
);
$grammar->precompute();
# The count of results without an r2 production, the count
# is C(n-1,3), when n>=4, 0 otherwise.
# The count of results with an r2 productions is C(n-1,8).
# Total results is the sum of the results with an
# r2 production and those without.
my @expected_count;
$expected_count[1] = 2; # 1 w/o r2; 1 with an r2
$expected_count[2] = 11; # 3 w/o r2; 8 with an r2
$expected_count[3] = 31; # 3 w/o r2; 28 with an r2
$expected_count[4] = 57; # 1 w/o r2; 56 with an r2
$expected_count[5] = 70; # 0 w/o r2; 70 with an r2
$expected_count[6] = 56; # 0 w/o r2; 70 with an r2
$expected_count[7] = 28; # 0 w/o r2; 28 with an r2
$expected_count[8] = 8; # 0 w/o r2; 8 with an r2
$expected_count[9] = 1; # 0 w/o r2; 1 with an r2
for my $input_length ( 1 .. 9 ) {
my $recce = Marpa::R2::Recognizer->new(
{ grammar => $grammar, max_parses => 100 } );
for ( 1 .. $input_length ) { $recce->read( 't', 't' ); }
my $expected = 1;
my $parse_count = 0;
while ( $expected and my $value_ref = $recce->value() ) {
$expected = 0;
$parse_count++;
my $value = ${$value_ref};
if ($value =~ m{
\A
[(]
((t|[-])[;]){3}
(t|[-])
[)]
\z
}xms
)
{
$expected = 1;
} ## end if ( $value =~ m{ ) (})
elsif (
$value =~ m{
\A
[(]
((t|[-])[;]){3}
[(]
((t|[-])[;]){5}
(t|[-])
[)]
[)]
\z
}xms
)
{
$expected = 1;
} ## end elsif ( $value =~ m{ ) (})
$expected &&= $input_length == ( $value =~ tr/t/t/ );
if ( not $expected ) {
Test::More::fail(
qq{Unexpected value, length=$input_length, "$value"});
}
} ## end while ( $expected and my $value_ref = $recce->value() )
if ($expected) {
my $expected_count = $expected_count[$input_length];
if ( $parse_count == $expected_count ) {
Test::More::pass(
qq{Good parse count $parse_count; input length=$input_length}
);
}
else {
Test::More::fail(
qq{Bad parse count $parse_count, expected $expected_count; input length=$input_length}
);
}
} ## end if ($expected)
} ## end for my $input_length ( 1 .. 9 )
1; # In case used as "do" file
# Local Variables:
# mode: cperl
# cperl-indent-level: 4
# fill-column: 100
# End:
# vim: expandtab shiftwidth=4:
|
