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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/.
use 5.010001;
use strict;
use warnings;
use English qw( -no_match_vars );
use Test::More tests => 3;
use Fatal qw(open close);
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
sub test_grammar {
my ( $grammar_args, $tokens ) = @_;
my $grammar;
my $eval_ok =
eval { $grammar = Marpa::R2::Grammar->new($grammar_args); 1; };
die "Exception while creating Grammar:\n$EVAL_ERROR"
if not $eval_ok;
die "Grammar not created\n" if not $grammar;
$grammar->precompute();
my $recce;
$eval_ok = eval {
$recce = Marpa::R2::Recognizer->new( { grammar => $grammar } );
1;
};
die "Exception while creating Recognizer:\n$EVAL_ERROR"
if not $eval_ok;
die "Recognizer not created\n" if not $recce;
for my $token ( @{$tokens} ) {
my $earleme_result;
$eval_ok = eval {
$recce->alternative( @{$token} );
$earleme_result = $recce->earleme_complete();
1;
};
die "Exception while recognizing earleme:\n$EVAL_ERROR"
if not $eval_ok;
die "Parsing exhausted\n"
if not defined $earleme_result;
} ## end for my $token ( @{$tokens} )
$eval_ok = eval { $recce->end_input(); 1; };
die "Exception while recognizing end of input:\n$EVAL_ERROR"
if not $eval_ok;
my $value_ref = $recce->value();
die "No parse\n" if not $value_ref;
return ${$value_ref};
} ## end sub test_grammar
# RHS too long is not testable
# Perl runs out of memory first
# test a grammar with no limit problems
my $result_on_success = '(a;a)';
my $placebo = {
start => 'S',
rules => [
#<<< no perltidy
[ 'S', [ qw(A A) ] ],
[ 'A', [qw/a/] ]
#>>>
],
default_action => 'main::default_action',
};
sub gen_tokens {
my ($earleme_length) = @_;
return [ [ 'a', \'a', 1 ], [ 'a', \'a', $earleme_length ] ];
}
my $value;
my $eval_ok = eval { $value = test_grammar( $placebo, gen_tokens(1) ); 1; };
if ( not defined $eval_ok ) {
Test::More::diag($EVAL_ERROR);
Test::More::fail('Placebo grammar');
}
else { Test::More::is( $value, $result_on_success, 'Placebo grammar' ) }
## lots of test values in the following, some of them pretty
## arbitrary
$eval_ok = eval { $value = test_grammar( $placebo, gen_tokens(20_031) ); 1; };
if ( not defined $eval_ok ) { Test::More::fail('Earleme very long') }
else {
Test::More::is( $value, $result_on_success,
'Earleme very long, but still OK' );
}
$eval_ok =
eval { $value = test_grammar( $placebo, gen_tokens( 2**31 ) ); 1; };
REPORT_RESULT: {
if ( defined $eval_ok ) {
Test::More::diag("Earleme too long test returned value: $value");
Test::More::fail('Did not catch problem with earleme too long');
last REPORT_RESULT;
}
if ( $EVAL_ERROR
=~ / \A Exception \s while \s recognizing \s earleme /xms )
{
Test::More::pass('Caught over-long earleme');
last REPORT_RESULT;
} ## end if ( $EVAL_ERROR =~ ...)
Test::More::is( $EVAL_ERROR, q{}, 'Grammar with earleme too long' );
} ## end REPORT_RESULT:
1; # In case used as "do" file
# Local Variables:
# mode: cperl
# cperl-indent-level: 4
# fill-column: 100
# End:
# vim: expandtab shiftwidth=4:
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