=item B<parse>
-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 /;
+use vars qw/ $xpc $graphattr $nodedata $witnesses /;
# Return graph -> nodeid -> { key1/val1, key2/val2, key3/val3 ... }
# -> edgeid -> { source, target, wit1/val1, wit2/val2 ...}
sub parse {
- my( $graphml_str ) = @_;
+ my( $opts ) = @_;
my $graph_hash = { 'nodes' => [],
- 'edges' => [] };
+ '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 $graphml = $doc->documentElement();
$xpc = XML::LibXML::XPathContext->new( $graphml );
$xpc->registerNs( 'g', 'http://graphml.graphdrawing.org/xmlns' );
# First get the ID keys, for witnesses and for collation data
foreach my $k ( $xpc->findnodes( '//g:key' ) ) {
- # Each key has a 'for' attribute; the edge keys are witnesses, and
- # the node keys contain an ID and string for each node.
- 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
- } else {
- $witnesses->{$keyid} = $keyname;
- }
+ # Each key has a 'for' attribute; the edge keys are witnesses, and
+ # the node keys contain an ID and string for each node.
+ my $keyid = $k->getAttribute( 'id' );
+ my $keyname = $k->getAttribute( 'attr.name' );
+
+ # 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];
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
- my $node_hash = {};
- foreach my $dkey ( keys %$nodedata ) {
- my $keyname = $nodedata->{$dkey};
- my $keyvalue = _lookup_node_data( $n, $dkey );
- $node_hash->{$keyname} = $keyvalue if $keyvalue;
- }
- $node_reg->{$n->getAttribute( 'id' )} = $node_hash;
- push( @{$graph_hash->{'nodes'}}, $node_hash );
+ # Could use a better way of registering these
+ my $node_hash = {};
+ foreach my $dkey ( keys %$nodedata ) {
+ my $keyname = $nodedata->{$dkey};
+ my $keyvalue = _lookup_node_data( $n, $dkey );
+ $node_hash->{$keyname} = $keyvalue if defined $keyvalue;
+ }
+ $node_reg->{$n->getAttribute( 'id' )} = $node_hash;
+ push( @{$graph_hash->{'nodes'}}, $node_hash );
}
-
+
# 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');
- my $to = $e->getAttribute('target');
-
- # We don't know whether the edge data is one per witness
- # or one per witness type, or something else. So we just
- # save it and let our calling parser decide.
- my $edge_hash = {
- 'source' => $node_reg->{$from},
- 'target' => $node_reg->{$to},
- };
- foreach my $wkey( keys %$witnesses ) {
- my $wname = $witnesses->{$wkey};
- my $wlabel = _lookup_node_data( $e, $wkey );
- $edge_hash->{$wname} = $wlabel if $wlabel;
- }
- push( @{$graph_hash->{'edges'}}, $edge_hash );
+ my $from = $e->getAttribute('source');
+ my $to = $e->getAttribute('target');
+
+ # We don't know whether the edge data is one per witness
+ # or one per witness type, or something else. So we just
+ # save it and let our calling parser decide.
+ my $edge_hash = {
+ 'source' => $node_reg->{$from},
+ 'target' => $node_reg->{$to},
+ };
+ foreach my $wkey( keys %$witnesses ) {
+ my $wname = $witnesses->{$wkey};
+ my $wlabel = _lookup_node_data( $e, $wkey );
+ $edge_hash->{$wname} = $wlabel if $wlabel;
+ }
+ push( @{$graph_hash->{'edges'}}, $edge_hash );
}
return $graph_hash;
}
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;
}
projects / scpubgit/stemmatology.git / blobdiff