#!perl
# Marpa::R3 is Copyright (C) 2017, Jeffrey Kegler.
#
# This module is free software; you can redistribute it and/or modify it
# under the same terms as Perl 5.10.1. For more details, see the full text
# of the licenses in the directory LICENSES.
#
# This program is distributed in the hope that it will be
# useful, but it is provided "as is" and without any express
# or implied warranties. For details, see the full text of
# of the licenses in the directory LICENSES.

# Test of scannerless parsing -- completion events

use 5.010001;
use strict;
use warnings;

use Test::More tests => 10;
use English qw( -no_match_vars );
use POSIX qw(setlocale LC_ALL);

POSIX::setlocale(LC_ALL, "C");

use lib 'inc';
use Marpa::R3::Test;
use Marpa::R3;

my $rules = <<'END_OF_GRAMMAR';
:start ::= text
text ::= <text segment>* action => OK
<text segment> ::= subtext
<text segment> ::= <word>
subtext ::= '(' text ')'

event subtext = completed <subtext>

word ~ [\w]+
:discard ~ whitespace
whitespace ~ [\s]+
END_OF_GRAMMAR

my $grammar = Marpa::R3::Scanless::G->new(
    { semantics_package => 'My_Actions', source => \$rules } );


do_test($grammar, q{42 ( hi 42 hi ) 7 11}, [ '( hi 42 hi )' ]);
do_test($grammar, q{42 ( hi) 42 (hi ) 7 11}, [ '( hi)', '(hi )' ] );
do_test($grammar, q{(hi 42 hi)}, ['(hi 42 hi)']);
do_test($grammar, q{1(2(3(4)))}, [ qw{ (4) (3(4)) (2(3(4))) } ]);
do_test($grammar, q{(((1)2)3)4}, [ qw{(1) ((1)2) (((1)2)3)} ]);

sub show_last_subtext {
    my ($recce) = @_;
    my ( $start, $length ) = $recce->last_completed('subtext');
    return 'No expression was successfully parsed' if not defined $start;
    return $recce->g1_literal( $start, $length );
}

sub do_test {
    my ( $grammar, $string, $expected_events ) = @_;
    my @actual_events;
    my $recce = Marpa::R3::Scanless::R->new(
        {
            grammar        => $grammar,
            event_handlers => {
                "'default" => sub () { 'ok' },
                "subtext"  => sub () {
                    my ($recce) = @_;
                    push @actual_events, show_last_subtext($recce);
                    'ok';
                }
            }
        }
    );
    my $length = length $string;
    my $pos    = $recce->read( \$string );
    while ( $pos < $length ) {
        $pos = $recce->resume($pos);
    }
    my $value_ref = $recce->value();
    if ( not defined $value_ref ) {
        die "No parse\n";
    }
    my $actual_value = ${$value_ref};
    Test::More::is( $actual_value, q{1792}, qq{Value for "$string"} );
    Test::More::is_deeply( \@actual_events, $expected_events,
        qq{Events for "$string"} );
}

sub My_Actions::OK { return 1792 };

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