use strict;
use warnings;
+use Exporter 'import';
+use vars qw/ @EXPORT_OK $xpc /;
+
use XML::LibXML;
use XML::LibXML::XPathContext;
+@EXPORT_OK = qw/ graphml_parse populate_witness_path /;
+
=head1 NAME
Text::Tradition::Parser::GraphML
=head1 METHODS
-=over
-
-=item B<parse>
+=head2 B<graphml_parse>( $init_opts )
-parse( $graphml_string );
+parse( $init_opts );
-Takes a string containing the GraphML; returns a list of nodes, edges,
+Takes a set of Tradition initialization options, among which should be either
+'file' or 'string'; parses that file or string and returns a list of nodes, edges,
and their associated data.
=cut
-use vars qw/ $xpc $nodedata $witnesses /;
-
# Return graph -> nodeid -> { key1/val1, key2/val2, key3/val3 ... }
# -> edgeid -> { source, target, wit1/val1, wit2/val2 ...}
-sub parse {
- my( $graphml_str ) = @_;
+sub graphml_parse {
+ my( $opts ) = @_;
my $graph_hash = { 'nodes' => [],
'edges' => [] };
-
+
my $parser = XML::LibXML->new();
- my $doc = $parser->parse_string( $graphml_str );
+ my $doc;
+ if( exists $opts->{'string'} ) {
+ $doc = $parser->parse_string( $opts->{'string'} );
+ } elsif ( exists $opts->{'file'} ) {
+ $doc = $parser->parse_file( $opts->{'file'} );
+ } else {
+ warn "Could not find string or file option to parse";
+ return;
+ }
+
+ my( $graphattr, $nodedata, $witnesses ) = ( {}, {}, {} );
my $graphml = $doc->documentElement();
$xpc = XML::LibXML::XPathContext->new( $graphml );
$xpc->registerNs( 'g', 'http://graphml.graphdrawing.org/xmlns' );
my $keyid = $k->getAttribute( 'id' );
my $keyname = $k->getAttribute( 'attr.name' );
- if( $k->getAttribute( 'for' ) eq 'node' ) {
- # Keep track of the XML identifiers for the data carried
- # in each node element.
- $nodedata->{$keyid} = $keyname
+ # Keep track of the XML identifiers for the data carried
+ # in each node element.
+ my $dtype = $k->getAttribute( 'for' );
+ if( $dtype eq 'graph' ) {
+ $graphattr->{$keyid} = $keyname;
+ } elsif( $dtype eq 'node' ) {
+ $nodedata->{$keyid} = $keyname;
} else {
$witnesses->{$keyid} = $keyname;
}
}
my $graph_el = $xpc->find( '/g:graphml/g:graph' )->[0];
+ $graph_hash->{'name'} = $graph_el->getAttribute( 'id' );
my $node_reg = {};
+
+ # Read in graph globals (if any).
+ print STDERR "Reading graphml global data\n";
+ foreach my $dkey ( keys %$graphattr ) {
+ my $keyname = $graphattr->{$dkey};
+ my $keyvalue = _lookup_node_data( $graph_el, $dkey );
+ $graph_hash->{'global'}->{$keyname} = $keyvalue;
+ }
- # Add the nodes to the graph hash.
+ # Add the nodes to the graph hash.
+ print STDERR "Reading graphml nodes\n";
my @nodes = $xpc->findnodes( '//g:node' );
foreach my $n ( @nodes ) {
# Could use a better way of registering these
}
# Now add the edges, and cross-ref with the node objects.
+ print STDERR "Reading graphml edges\n";
my @edges = $xpc->findnodes( '//g:edge' );
foreach my $e ( @edges ) {
my $from = $e->getAttribute('source');
return $graph_hash;
}
+=head2 B<populate_witness_path>( $tradition )
+
+Given a tradition, populate the 'path' and 'uncorrected_path' attributes
+of all of its witnesses. Useful for all formats based on the graph itself.
+
+=cut
+
+sub populate_witness_path {
+ my ( $tradition, $ante_corr ) = @_;
+ my $c = $tradition->collation;
+ print STDERR "Walking paths for witnesses\n";
+ foreach my $wit ( $tradition->witnesses ) {
+ my @path = $c->reading_sequence( $c->start, $c->end, $wit->sigil );
+ $wit->path( \@path );
+ if( $ante_corr->{$wit->sigil} ) {
+ # Get the uncorrected path too
+ my @uc = $c->reading_sequence( $c->start, $c->end,
+ $wit->sigil . $c->ac_label, $wit->sigil );
+ $wit->uncorrected_path( \@uc );
+ }
+ }
+}
+
sub _lookup_node_data {
my( $xmlnode, $key ) = @_;
my $lookup_xpath = './g:data[@key="%s"]/child::text()';
- my $data = $xpc->findvalue( sprintf( $lookup_xpath, $key ), $xmlnode );
+ my $data = $xpc->find( sprintf( $lookup_xpath, $key ), $xmlnode );
+ # If we get back an empty nodelist, we return undef.
+ if( ref( $data ) ) {
+ return undef unless $data->size;
+ return $data->to_literal->value;
+ }
+ # Otherwise we got back a value. Return it.
return $data;
}