File Coverage

blib/lib/Gedcom/Grammar.pm

Criterion	Covered	Total	%
statement	58	61	95.0
branch	16	22	72.7
condition	4	6	66.6
subroutine	10	11	90.9
pod	5	6	83.3
total	93	106	87.7

# Copyright 1998-2019, Paul Johnson ([e-mail])

# This software is free.  It is licensed under the same terms as Perl itself.

# The latest version of this software should be available from my homepage:
# http://www.pjcj.net

# documentation at __END__

use strict;

require 5.005;

package Gedcom::Grammar;

use Data::Dumper;

use Gedcom::Item 1.21;

use vars qw($VERSION @ISA);
$VERSION = "1.21";
@ISA     = qw( Gedcom::Item );

sub structure {
    my $self = shift;
    my ($struct) = @_;
    unless (exists $self->{top}{structures}) {
        $self->{top}{structures} = {
            map { $_->{structure} ? ($_->{structure} => $_) : () }
                @{$self->{top}{items}}
        };
    }
    # print Dumper $self->{top}{structures};
    $self->{top}{structures}{$struct}
}

sub item {
    my $self = shift;
    my ($tag) = @_;
    return unless defined $tag;
    my $valid_items = $self->valid_items;
    # use Data::Dumper; print "[$tag] -- ", Dumper($self), Dumper $valid_items;
    return unless exists $valid_items->{$tag};
    map { $_->{grammar} } @{$valid_items->{$tag}}
}

sub min {
    my $self = shift;
    exists $self->{min} ? $self->{min} : 1
}

sub max {
    my $self = shift;
    exists $self->{max} ? $self->{max} eq "M" ? 0 : $self->{max} : 1
}

sub items {
    my $self = shift;
    keys %{$self->valid_items}
}

sub _valid_items {
    my $self = shift;
    my %valid_items;
    for my $item (@{$self->{items}}) {
        my $min = $item->min;
        my $max = $item->max;
        if ($item->{tag}) {
            push @{$valid_items{$item->{tag}}}, {
                grammar => $item,
                min     => $min,
                max     => $max
            };
        } else {
            die "What's a " . Data::Dumper->new([$item], ["grammar"])
            unless my ($value) = $item->{value} =~ /<<(.*)>>/;
            die "Can't find $value in Gedcom structures"
            unless my $structure = $self->structure($value);
            $item->{structure} = $structure;
            while (my($tag, $g) = each %{$structure->valid_items}) {
                push @{$valid_items{$tag}}, map {
                    grammar => $_->{grammar},
                    # min and max can be calculated by multiplication because
                    # the grammar always permits multiple selection records, and
                    # selection records never have compulsory records.  This may
                    # change in future grammars, but I would not expect it to -
                    # such a grammar would seem to have little practical use.
                    min     => $_->{min} * $min,
                    max     => $_->{max} * $max
                }, @$g;
            }
            if (exists $item->{items} && @{$item->{items}}) {
                my $extra_items = $item->_valid_items;
                while (my ($sub_item, $sub_grammars) = each %valid_items) {
                    for my $sub_grammar (@$sub_grammars) {
                        $sub_grammar->{grammar}->valid_items;
                        while (my ($i, $g) = each %$extra_items) {
                            # print "adding $i to $sub_item\n";
                            $sub_grammar->{grammar}{_valid_items}{$i} = $g;
                        }
                    }
                    # print "giving @{[keys %{$sub_grammar->{grammar}->valid_items}]}\n";
                }
            }
        }
    }
    # print "valid items are @{[keys %valid_items]}\n";
    \%valid_items
}

sub valid_items {
    my $self = shift;
    $self->{_valid_items} ||= $self->_valid_items
}

1;

__END__