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#!/usr/bin/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/.
# This example is from a Perl 6 advent blog post
# (Day 18 2013) by Dwarring, adapted to Marpa by Jean-Damien
# Durand.
use 5.010001;
use strict;
use warnings;
use English qw( -no_match_vars );
use utf8;
use open ':std', ':encoding(utf8)';
use Test::More tests => 54;
use lib 'inc';
use Marpa::R2::Test;
use Marpa::R2;
my $base_dsl = <<'END_OF_BASE_DSL';
:start ::= deal
deal ::= hands
hands ::= hand | hands ';' hand
hand ::= card card card card card
card ~ face suit
face ~ [2-9jqka] | '10'
WS ~ [\s]
:discard ~ WS
:lexeme ~ <card> pause => after event => 'card'
END_OF_BASE_DSL
my @tests = ();
push @tests,
[
'2♥ 5♥ 7♦ 8♣ 9♠',
'Parse OK',
'Hand was 2♥ 5♥ 7♦ 8♣ 9♠',
];
push @tests,
[
'2♥ a♥ 7♦ 8♣ j♥',
'Parse OK',
'Hand was 2♥ a♥ 7♦ 8♣ j♥',
];
push @tests,
[
'a♥ a♥ 7♦ 8♣ j♥',
'Parse stopped by application',
'Duplicate card a♥'
];
push @tests,
[
'a♥ 7♥ 7♦ 8♣ j♥; 10♥ j♥ q♥ k♥ a♥',
'Parse stopped by application',
'Duplicate card j♥'
];
push @tests,
[
'2♥ 7♥ 2♦ 3♣ 3♦',
'Parse OK',
'Hand was 2♥ 7♥ 2♦ 3♣ 3♦',
];
push @tests,
[
'2♥ 7♥ 2♦ 3♣',
'Parse reached end of input, but failed',
'No hands were found'
];
push @tests, [
'2♥ 7♥ 2♦ 3♣ 3♦ 1♦',
'Parse failed before end',
<<'END_OF_MESSAGE'
Error in SLIF parse: No lexeme found at line 1, column 16
* String before error: 2\x{2665} 7\x{2665} 2\x{2666} 3\x{2663} 3\x{2666}\s
* The error was at line 1, column 16, and at character 0x0031 '1', ...
* here: 1\x{2666}
END_OF_MESSAGE
];
push @tests,
[
'2♥ 7♥ 2♦ 3♣',
'Parse reached end of input, but failed',
'No hands were found'
];
push @tests,
[
'a♥ 7♥ 7♦ 8♣ j♥; 10♥ j♣ q♥ k♥',
'Parse failed after finding hand(s)',
'Last hand successfully parsed was a♥ 7♥ 7♦ 8♣ j♥'
];
my @suit_line = (
[ 'suit ~ [\x{2665}\x{2666}\x{2663}\x{2660}]', 'hex' ],
[ 'suit ~ [♥♦♣♠]', 'char class' ],
[ q{suit ~ '♥' | '♦' | '♣'| '♠'}, 'strings' ],
);
for my $test_data (@tests) {
my ( $input, $expected_result, $expected_value ) = @{$test_data};
my ( $actual_result, $actual_value );
for my $suit_line_data (@suit_line) {
my ( $suit_line, $suit_line_type ) = @{$suit_line_data};
PROCESSING: {
# Note: in production, you would compute the three grammar variants
# ahead of time.
my $full_dsl = $base_dsl . $suit_line;
my $grammar =
Marpa::R2::Scanless::G->new( { source => \$full_dsl } );
my $re = Marpa::R2::Scanless::R->new( { grammar => $grammar } );
my $length = length $input;
my %played = ();
my $pos;
my $eval_ok = eval { $pos = $re->read( \$input ); 1 };
while ( $eval_ok and $pos < $length ) {
# In our example there is a single event: no need to ask Marpa what it is
my ( $start, $length ) =
$re->g1_location_to_span( $re->current_g1_location() );
my $card = $re->literal( $start, $length );
if ( ++$played{$card} > 1 ) {
$actual_result = 'Parse stopped by application';
$actual_value = "Duplicate card " . $card;
last PROCESSING;
}
$eval_ok = eval { $pos = $re->resume(); 1 };
} ## end while ( $eval_ok and $pos < $length )
if ( not $eval_ok ) {
$actual_result = "Parse failed before end";
$actual_value = $EVAL_ERROR;
$actual_value
=~ s/ ^ Marpa::R2 \s+ exception \s+ at \s .* \z//xms;
last PROCESSING;
} ## end if ( not $eval_ok )
my $value_ref = $re->value();
my $last_hand;
my ( $start, $end ) = $re->last_completed_range('hand');
if ( defined $start ) {
$last_hand = $re->range_to_string( $start, $end );
}
if ($value_ref) {
$actual_result = 'Parse OK';
$actual_value = "Hand was $last_hand";
last PROCESSING;
}
if ( defined $last_hand ) {
$actual_result = 'Parse failed after finding hand(s)';
$actual_value =
"Last hand successfully parsed was $last_hand";
last PROCESSING;
} ## end if ( defined $last_hand )
$actual_result = 'Parse reached end of input, but failed';
$actual_value = 'No hands were found';
} ## end PROCESSING:
Marpa::R2::Test::is( $actual_result, $expected_result,
"Result of $input using $suit_line_type" );
Marpa::R2::Test::is( $actual_value, $expected_value,
"Value of $input using $suit_line_type" );
} ## end for my $suit_line_data (@suit_line)
} ## end for my $test_data (@tests)
# vim: expandtab shiftwidth=4:
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