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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/.
# The example from p. 168-169 of Leo's paper.
#
# Make sure I have a CHAF example!
#
use 5.010001;
use strict;
use warnings;
use Test::More tests => 17;
use lib 'inc';
use Marpa::R2::Test;
use Marpa::R2;
## no critic (Subroutines::RequireArgUnpacking)
sub generate_action {
my ($lhs) = @_;
return sub {
shift;
my $v_count = scalar @_;
return q{-} if $v_count <= 0;
my @vals = map { $_ // q{-} } @_;
return $lhs . '(' . ( join q{;}, @vals ) . ')';
}
} ## end sub generate_action
my $C_action = generate_action('C');
my $S_action = generate_action('S');
my $default_action = generate_action(q{?});
## use critic
my $grammar = Marpa::R2::Grammar->new(
{ start => 'S',
rules => [
[ 'S', [qw/a S/], 'S_action', ],
[ 'S', [qw/C/], 'S_action', ],
[ 'C', [qw(a C b)], 'C_action', ],
[ 'C', [], ],
],
terminals => [qw(a b)],
default_action => 'default_action',
}
);
$grammar->precompute();
Marpa::R2::Test::is( $grammar->show_symbols(),
<<'END_OF_STRING', 'Leo168 Symbols' );
0: a, terminal
1: b, terminal
2: S
3: C
END_OF_STRING
Marpa::R2::Test::is( $grammar->show_rules,
<<'END_OF_STRING', 'Leo168 Rules' );
0: S -> a S
1: S -> C
2: C -> a C b
3: C -> /* empty !used */
END_OF_STRING
Marpa::R2::Test::is( $grammar->show_ahms, <<'END_OF_STRING', 'Leo168 AHMs' );
AHM 0: postdot = "a"
S ::= . a S
AHM 1: postdot = "S"
S ::= a . S
AHM 2: completion
S ::= a S .
AHM 3: postdot = "a"
S ::= . a S[]
AHM 4: completion
S ::= a S[] .
AHM 5: postdot = "C"
S ::= . C
AHM 6: completion
S ::= C .
AHM 7: postdot = "a"
C ::= . a C b
AHM 8: postdot = "C"
C ::= a . C b
AHM 9: postdot = "b"
C ::= a C . b
AHM 10: completion
C ::= a C b .
AHM 11: postdot = "a"
C ::= . a C[] b
AHM 12: postdot = "b"
C ::= a C[] . b
AHM 13: completion
C ::= a C[] b .
AHM 14: postdot = "S"
S['] ::= . S
AHM 15: completion
S['] ::= S .
END_OF_STRING
my %expected = (
'a' => q{S(a;-)},
'ab' => q{S(C(a;-;b))},
'aa' => q{S(a;S(a;-))},
'aab' => q{S(a;S(C(a;-;b)))},
'aabb' => q{S(C(a;C(a;-;b);b))},
'aaa' => q{S(a;S(a;S(a;-)))},
'aaab' => q{S(a;S(a;S(C(a;-;b))))},
'aaabb' => q{S(a;S(C(a;C(a;-;b);b)))},
'aaabbb' => q{S(C(a;C(a;C(a;-;b);b);b))},
'aaaa' => q{S(a;S(a;S(a;S(a;-))))},
'aaaab' => q{S(a;S(a;S(a;S(C(a;-;b)))))},
'aaaabb' => q{S(a;S(a;S(C(a;C(a;-;b);b))))},
'aaaabbb' => q{S(a;S(C(a;C(a;C(a;-;b);b);b)))},
'aaaabbbb' => q{S(C(a;C(a;C(a;C(a;-;b);b);b);b))},
);
for my $a_length ( 1 .. 4 ) {
for my $b_length ( 0 .. $a_length ) {
my $string = ( 'a' x $a_length ) . ( 'b' x $b_length );
my $recce = Marpa::R2::Recognizer->new(
{ grammar => $grammar,
closures => {
'C_action' => $C_action,
'S_action' => $S_action,
'default_action' => $default_action,
}
}
);
for (1 .. $a_length ) {
$recce->read( 'a', 'a' );
}
for (1 .. $b_length ) {
$recce->read( 'b', 'b' );
}
my $value_ref = $recce->value();
my $value = $value_ref ? ${$value_ref} : 'No parse';
Marpa::R2::Test::is( $value, $expected{$string}, "Parse of $string" );
} ## end for my $b_length ( 0 .. $a_length )
} ## end for my $a_length ( 1 .. 4 )
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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