#!/usr/bin/perl
# Copyright 2015 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/.
# Tutorial 2 synopsis
use 5.010;
use strict;
use warnings;
use Test::More tests => 1;
use lib 'inc';
use Marpa::R2::Test;
## no critic (ErrorHandling::RequireCarping);
# Marpa::R2::Display
# name: Tutorial 2 synopsis
use Marpa::R2;
my $dsl = <<'END_OF_DSL';
:default ::= action => [name,values]
lexeme default = latm => 1
Calculator ::= Expression action => ::first
Factor ::= Number action => ::first
Term ::=
Term '*' Factor action => do_multiply
| Factor action => ::first
Expression ::=
Expression '+' Term action => do_add
| Term action => ::first
Number ~ digits
digits ~ [\d]+
:discard ~ whitespace
whitespace ~ [\s]+
END_OF_DSL
my $grammar = Marpa::R2::Scanless::G->new( { source => \$dsl } );
my $recce = Marpa::R2::Scanless::R->new(
{ grammar => $grammar, semantics_package => 'My_Actions' } );
my $input = '42 * 1 + 7';
my $length_read = $recce->read( \$input );
die "Read ended after $length_read of ", length $input, " characters"
if $length_read != length $input;
if ( my $ambiguous_status = $recce->ambiguous() ) {
chomp $ambiguous_status;
die "Parse is ambiguous\n", $ambiguous_status;
}
my $value_ref = $recce->value;
my $value = ${$value_ref};
sub My_Actions::do_add {
my ( undef, $t1, undef, $t2 ) = @_;
return $t1 + $t2;
}
sub My_Actions::do_multiply {
my ( undef, $t1, undef, $t2 ) = @_;
return $t1 * $t2;
}
# Marpa::R2::Display::End
Test::More::is( $value, 49, 'Tutorial 2 synopsis value' );
1; # In case used as "do" file
# Local Variables:
# mode: cperl
# cperl-indent-level: 4
# fill-column: 100
# End:
# vim: expandtab shiftwidth=4: