X-Git-Url: http://git.indexdata.com/?p=irspy-moved-to-github.git;a=blobdiff_plain;f=lib%2FZOOM%2FIRSpy%2FUtils.pm;h=e52747f635c16ff933015a44de9dbcf0996af9a0;hp=008c49a7142907f3ddfaa93e69c279ad0e035ff6;hb=cffc7e022fec2dc52a445299cccf029c2c9c413a;hpb=08a63aeaaf3f0110e667dd2152e6d3f18c005ab1

diff --git a/lib/ZOOM/IRSpy/Utils.pm b/lib/ZOOM/IRSpy/Utils.pm
index 008c49a..e52747f 100644
--- a/lib/ZOOM/IRSpy/Utils.pm
+++ b/lib/ZOOM/IRSpy/Utils.pm
@@ -1,4 +1,4 @@
-# $Id: Utils.pm,v 1.3 2006-10-31 09:26:11 mike Exp $
+# $Id: Utils.pm,v 1.5 2006-11-01 11:46:10 mike Exp $
 
 package ZOOM::IRSpy::Utils;
 
@@ -9,9 +9,14 @@ use warnings;
 use Exporter 'import';
 our @EXPORT_OK = qw(xml_encode 
 		    irspy_xpath_context
-		    dom_add_element
+		    modify_xml_document
 		    inheritance_tree);
 
+use XML::LibXML;
+use XML::LibXML::XPathContext;
+
+our $IRSPY_NS = 'http://indexdata.com/irspy/1.0';
+
 
 # Utility functions follow, exported for use of web UI
 
@@ -40,11 +45,72 @@ sub irspy_xpath_context {
     my $root = $doc->getDocumentElement();
     my $xc = XML::LibXML::XPathContext->new($root);
     $xc->registerNs(e => 'http://explain.z3950.org/dtd/2.0/');
-    $xc->registerNs(i => $ZOOM::IRSpy::irspy_ns);
+    $xc->registerNs(i => $IRSPY_NS);
     return $xc;
 }
 
 
+sub modify_xml_document {
+    my($xc, $fieldsByKey, $data) = @_;
+
+    my $nchanges = 0;
+    foreach my $key (keys %$data) {
+	my $value = $data->{$key};
+	my $ref = $fieldsByKey->{$key} or die "no field '$key'";
+	my($name, $nlines, $caption, $xpath, @addAfter) = @$ref;
+	#print "Considering $key='$value' ($xpath)<br/>\n";
+	my @nodes = $xc->findnodes($xpath);
+	if (@nodes) {
+	    warn scalar(@nodes), " nodes match '$xpath'" if @nodes > 1;
+	    my $node = $nodes[0];
+
+	    if ($node->isa("XML::LibXML::Attr")) {
+		if ($value ne $node->getValue()) {
+		    $node->setValue($value);
+		    $nchanges++;
+		    print "Attr $key: '", $node->getValue(), "' -> '$value' ($xpath)<br/>\n";
+		}
+	    } elsif ($node->isa("XML::LibXML::Element")) {
+		# The contents could be any mixture of text and
+		# comments and maybe even other crud such as processing
+		# instructions.  The simplest thing is just to throw it all
+		# away and start again, making a single Text node the
+		# canonical representation.  But before we do that,
+		# we'll check whether the element is already
+		# canonical, to determine whether our change is a
+		# no-op.
+		my $old = "???";
+		my @children = $node->childNodes();
+		if (@children == 1) {
+		    my $child = $node->firstChild();
+		    if (ref $child && ref $child eq "XML::LibXML::Text") {
+			$old = $child->getData();
+			next if $value eq $old;
+		    }
+		}
+
+		$node->removeChildNodes();
+		my $child = new XML::LibXML::Text($value);
+		$node->appendChild($child);
+		$nchanges++;
+		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";
+	    $nchanges++;
+	}
+    }
+
+    return $nchanges;
+}
+
+
 sub dom_add_element {
     my($xc, $ppath, $element, $value, @addAfter) = @_;