1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
|
#!/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/.
# NAIF semantics examples
use 5.010001;
use strict;
use warnings;
use Test::More tests => 7;
use English qw( -no_match_vars );
use Fatal qw( open close );
use lib 'inc';
use Marpa::R2::Test;
use Marpa::R2;
my $trace_rules = q{};
# Marpa::R2::Display
# name: Action context synopsis
sub do_S {
my ($action_object) = @_;
my $rule_id = $Marpa::R2::Context::rule;
my $grammar = $Marpa::R2::Context::grammar;
my ( $lhs, @rhs ) = $grammar->rule($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: Semantics 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::Grammar->new(
{ start => 'S',
rules =>
[ { lhs => 'S', rhs => \@terminals, action => 'main::do_S' }, ],
symbols => { map { ( $_ => { terminal => 1 } ) } @terminals }
}
);
$grammar->precompute();
# Marpa::R2::Display
# name: rule_ids() Synopsis
my @rule_ids = $grammar->rule_ids();
# Marpa::R2::Display::End
Test::More::is( ( join q{ }, @rule_ids ), '0', '$g->rule_ids() ok?' );
sub do_parse {
my $recce = Marpa::R2::Recognizer->new( { grammar => $grammar } );
for my $terminal (@terminals) {
$recce->read( $terminal, $terminal );
}
return $recce->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" );
# Local Variables:
# mode: cperl
# cperl-indent-level: 4
# fill-column: 100
# End:
# vim: expandtab shiftwidth=4:
|
