-# $Id: Utils.pm,v 1.6 2006-11-07 17:18:29 mike Exp $
+# $Id: Utils.pm,v 1.14 2006-11-14 16:21:49 mike Exp $
package ZOOM::IRSpy::Utils;
# Template::Plugin both roll their own. So I will do likewise. D'oh!
#
sub xml_encode {
- my ($text) = @_;
+ my ($text, $fallback) = @_;
+
+ $text = $fallback if !defined $text;
+ use Carp;
+ confess "xml_encode(): text and fallback both undefined"
+ if !defined $text;
+
$text =~ s/&/&/g;
$text =~ s/</</g;
$text =~ s/>/>/g;
}
+# PRIVATE to irspy_namespace() and irspy_xpath_context()
+my %_namespaces = (
+ e => 'http://explain.z3950.org/dtd/2.0/',
+ i => $IRSPY_NS,
+ );
+
+
+sub irspy_namespace {
+ my($prefix) = @_;
+
+ use Carp;
+ confess "irspy_namespace(undef)" if !defined $prefix;
+ my $uri = $_namespaces{$prefix};
+ die "irspy_namespace(): no URI for namespace prefix '$prefix'"
+ if !defined $uri;
+
+ return $uri;
+}
+
+
sub irspy_xpath_context {
- my($zoom_record) = @_;
+ my($record) = @_;
- my $xml = $zoom_record->render();
+ my $xml = ref $record ? $record->render() : $record;
my $parser = new XML::LibXML();
my $doc = $parser->parse_string($xml);
my $root = $doc->getDocumentElement();
my $xc = XML::LibXML::XPathContext->new($root);
- $xc->registerNs(e => 'http://explain.z3950.org/dtd/2.0/');
- $xc->registerNs(i => $IRSPY_NS);
+ foreach my $prefix (keys %_namespaces) {
+ $xc->registerNs($prefix, $_namespaces{$prefix});
+ }
return $xc;
}
if ($value ne $node->getValue()) {
$node->setValue($value);
$nchanges++;
- print "Attr $key: '", $node->getValue(), "' -> '$value' ($xpath)<br/>\n";
+ #print "Attr $key: '", $node->getValue(), "' -> '$value' ($xpath)<br/>\n";
}
} elsif ($node->isa("XML::LibXML::Element")) {
# The contents could be any mixture of text and
my $child = new XML::LibXML::Text($value);
$node->appendChild($child);
$nchanges++;
- print "Elem $key: '$old' -> '$value' ($xpath)<br/>\n";
+ #print "Elem $key: '$old' -> '$value' ($xpath)<br/>\n";
} else {
warn "unexpected node type $node";
}
} else {
next if !$value; # No need to create a new empty node
- my($ppath, $element) = $xpath =~ /(.*)\/(.*)/;
- dom_add_element($xc, $ppath, $element, $value, @addAfter);
- print "Add $key ($xpath) = '$value'<br/>\n";
+ my($ppath, $selector) = $xpath =~ /(.*)\/(.*)/;
+ dom_add_node($xc, $ppath, $selector, $value, @addAfter);
+ #print "New $key ($xpath) = '$value'<br/>\n";
$nchanges++;
}
}
}
-sub dom_add_element {
- my($xc, $ppath, $element, $value, @addAfter) = @_;
+sub dom_add_node {
+ my($xc, $ppath, $selector, $value, @addAfter) = @_;
- print "Adding '$value' at '$ppath' after (", join(", ", map { "'$_'" } @addAfter), ")<br/>\n";
- my @nodes = $xc->findnodes($ppath);
- if (@nodes == 0) {
- # Oh dear, the parent node doesn't exist. We could make it,
- # but for now let's not and say we did.
- warn "no parent node '$ppath': not adding '$element'='$value'";
+ #print "Adding $selector='$value' at '$ppath' after (", join(", ", map { "'$_'" } @addAfter), ")<br/>\n";
+ my $node = find_or_make_node($xc, $ppath, 0);
+ die "couldn't find or make node '$node'" if !defined $node;
+
+ my $is_attr = ($selector =~ s/^@//);
+ my(undef, $prefix, $simpleSel) = $selector =~ /((.*?):)?(.*)/;
+ #warn "selector='$selector', prefix='$prefix', simpleSel='$simpleSel'";
+ if ($is_attr) {
+ if (defined $prefix) {
+ ### This seems to no-op (thank, DOM!) but I have have no
+ # idea, and it's not needed for IRSpy, so I am not going
+ # to debug it now.
+ $node->setAttributeNS(irspy_namespace($prefix),
+ $simpleSel, $value);
+ } else {
+ $node->setAttribute($simpleSel, $value);
+ }
return;
}
- warn scalar(@nodes), " nodes match parent '$ppath'" if @nodes > 1;
- my $node = $nodes[0];
+ my $new = new XML::LibXML::Element($simpleSel);
+ $new->setNamespace(irspy_namespace($prefix), $prefix)
+ if defined $prefix;
+
+ $new->appendText($value);
+ foreach my $predecessor (reverse @addAfter) {
+ my($child) = $xc->findnodes($predecessor, $node);
+ if (defined $child) {
+ $node->insertAfter($new, $child);
+ #warn "Added after '$predecessor'";
+ return;
+ }
+ }
+
+ # Didn't find any of the nodes that are supposed to precede the
+ # new one, so we need to insert the new node as the first of the
+ # parent's children. However *sigh* there is no prependChild()
+ # analogous to appendChild(), so we have to go the long way round.
+ my @children = $node->childNodes();
+ if (@children) {
+ $node->insertBefore($new, $children[0]);
+ #warn "Added new first child";
+ } else {
+ $node->appendChild($new);
+ #warn "Added new only child";
+ }
if (0) {
my $text = xml_encode(inheritance_tree($xc));
}
+sub find_or_make_node {
+ my($xc, $path, $recursion_level) = @_;
+
+ die "deep recursion in find_or_make_node($path)"
+ if $recursion_level == 10;
+ $path = "." if $path eq "";
+
+ my @nodes = $xc->findnodes($path);
+ if (@nodes == 0) {
+ # Oh dear, the parent node doesn't exist. We could make it,
+ my(undef, $ppath, $element) = $path =~ /((.*)\/)?(.*)/;
+ $ppath = "" if !defined $ppath;
+ #warn "path='$path', ppath='$ppath', element='$element'";
+ #warn "no node '$path': making it";
+ my $parent = find_or_make_node($xc, $ppath, $recursion_level-1);
+
+ my(undef, $prefix, $nsElem) = $element =~ /((.*?):)?(.*)/;
+ #warn "element='$element', prefix='$prefix', nsElem='$nsElem'";
+ my $new = new XML::LibXML::Element($nsElem);
+ if (defined $prefix) {
+ #warn "setNamespace($prefix)";
+ $new->setNamespace(irspy_namespace($prefix), $prefix);
+ }
+
+ $parent->appendChild($new);
+ return $new;
+ }
+ warn scalar(@nodes), " nodes match parent '$path'" if @nodes > 1;
+ return $nodes[0];
+}
+
+
sub inheritance_tree {
my($type, $level) = @_;
$level = 0 if !defined $level;
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