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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/.
# SLIF semantics examples
use 5.010001;
use strict;
use warnings;
use Test::More tests => 6;
use English qw( -no_match_vars );
use Fatal qw( open close );
use lib 'inc';
use Marpa::R2::Test;
use Marpa::R2;
my $trace_rules = q{};
# Marpa::R2::Display
# name: SLIF action context synopsis
sub do_S {
my ($action_object) = @_;
my $rule_id = $Marpa::R2::Context::rule;
my $slg = $Marpa::R2::Context::slg;
my ( $lhs, @rhs ) =
map { $slg->symbol_display_form($_) } $slg->rule_expand($rule_id);
$action_object->{text} =
"rule $rule_id: $lhs ::= "
. ( join q{ }, @rhs ) . "\n"
. "locations: "
. ( join q{-}, Marpa::R2::Context::location() ) . "\n";
return $action_object;
} ## end sub do_S
# Marpa::R2::Display::End
# Marpa::R2::Display
# name: SLIF bail synopsis
my $bail_message = "This is a bail out message!";
sub do_bail_with_message_if_A {
my ($action_object, $terminal) = @_;
Marpa::R2::Context::bail($bail_message) if $terminal eq 'A';
}
sub do_bail_with_object_if_A {
my ($action_object, $terminal) = @_;
Marpa::R2::Context::bail([$bail_message]) if $terminal eq 'A';
}
# Marpa::R2::Display::End
my @terminals = qw/A B C D/;
my $grammar = Marpa::R2::Scanless::G->new(
{ source => \<<'END_OF_SOURCE',
:start ::= S
S ::= A B C D action => main::do_S
A ~ 'A'
B ~ 'B'
C ~ 'C'
D ~ 'D'
END_OF_SOURCE
});
sub do_parse {
my $slr = Marpa::R2::Scanless::R->new( { grammar => $grammar } );
$slr->read( \'ABCD' );
return $slr->value();
} ## end sub do_parse
my $value_ref;
$value_ref = do_parse();
VALUE_TEST: {
if ( ref $value_ref ne 'REF' ) {
my $ref_type = ref $value_ref;
Test::More::fail(
qq{Parse result ref type is "$ref_type"; it needs to be "REF"});
last VALUE_TEST;
} ## end if ( ref $value_ref ne 'REF' )
my $value = ${$value_ref};
if ( ref $value ne 'HASH' ) {
my $ref_type = ref $value;
Test::More::fail(
qq{Parse value ref type is "$ref_type"; it needs to be "HASH"});
last VALUE_TEST;
} ## end if ( ref $value ne 'HASH' )
my $expected_text = qq{rule 0: S ::= A B C D\nlocations: 0-4\n};
Test::More::is( $value->{text}, $expected_text, 'Parse ok?' );
} ## end VALUE_TEST:
my $eval_ok;
{
local *do_S = *do_bail_with_message_if_A;
$eval_ok = eval { $value_ref = do_parse(); 1 };
}
my $actual_eval_error = $EVAL_ERROR
// 'no eval error'; # grab it now to be safe
Test::More::ok( ( not defined $eval_ok ),
"bail with string argument happened" );
$actual_eval_error
=~ s/\A User \s+ bailed \s+ at \s+ line \s+ \d+ [^\n]* \n/<LOCATION LINE>/xms;
Test::More::is(
$actual_eval_error,
'<LOCATION LINE>' . $bail_message . "\n",
"bail with string argument"
);
{
local *do_S = *do_bail_with_object_if_A;
$eval_ok = eval { $value_ref = do_parse(); 1 };
}
$actual_eval_error = $EVAL_ERROR;
my $eval_error_ref_type = ref $actual_eval_error;
my $exception_value_desc =
$eval_error_ref_type eq 'ARRAY'
? $actual_eval_error->[0]
: "ref type of exception is $eval_error_ref_type";
Test::More::ok( ( not defined $eval_ok ),
"bail with object argument happened" );
Test::More::is( $eval_error_ref_type, 'ARRAY',
"bail with object argument ref type" );
Test::More::is( $exception_value_desc, $bail_message,
"bail with object argument value" );
# vim: expandtab shiftwidth=4:
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