1 files changed, 123 insertions, 0 deletions
diff --git a/rdflib/tools/rdf2dot.py b/rdflib/tools/rdf2dot.py
new file mode 100644
index 00000000..104fd990
--- /dev/null
+++ b/rdflib/tools/rdf2dot.py
@@ -0,0 +1,123 @@
+#!/usr/bin/env python
+
+import rdflib
+import rdflib.extras.cmdlineutils
+
+import sys
+import cgi
+import collections
+
+from rdflib import XSD
+
+LABEL_PROPERTIES = [rdflib.RDFS.label,
+                    rdflib.URIRef("http://purl.org/dc/elements/1.1/title"),
+                    rdflib.URIRef("http://xmlns.com/foaf/0.1/name"),
+                    rdflib.URIRef("http://www.w3.org/2006/vcard/ns#fn"),
+                    rdflib.URIRef("http://www.w3.org/2006/vcard/ns#org")
+                    ]
+
+XSDTERMS = [
+    XSD[x] for x in (
+        "anyURI", "base64Binary", "boolean", "byte", "date",
+        "dateTime", "decimal", "double", "duration", "float", "gDay", "gMonth",
+        "gMonthDay", "gYear", "gYearMonth", "hexBinary", "ID", "IDREF",
+        "IDREFS", "int", "integer", "language", "long", "Name", "NCName",
+        "negativeInteger", "NMTOKEN", "NMTOKENS", "nonNegativeInteger",
+        "nonPositiveInteger", "normalizedString", "positiveInteger", "QName",
+        "short", "string", "time", "token", "unsignedByte", "unsignedInt",
+        "unsignedLong", "unsignedShort")]
+
+EDGECOLOR = "blue"
+NODECOLOR = "black"
+ISACOLOR = "black"
+
+
+def rdf2dot(g, stream, opts={}):
+    """
+    Convert the RDF graph to DOT
+    writes the dot output to the stream
+    """
+
+    fields = collections.defaultdict(set)
+    nodes = {}
+
+    def node(x):
+
+        if x not in nodes:
+            nodes[x] = "node%d" % len(nodes)
+        return nodes[x]
+
+    def label(x, g):
+
+        for labelProp in LABEL_PROPERTIES:
+            l = g.value(x, labelProp)
+            if l:
+                return l
+
+        try:
+            return g.namespace_manager.compute_qname(x)[2]
+        except:
+            return x
+
+    def formatliteral(l, g):
+        v = cgi.escape(l)
+        if l.datatype:
+            return u'&quot;%s&quot;^^%s' % (v, qname(l.datatype, g))
+        elif l.language:
+            return u'&quot;%s&quot;@%s' % (v, l.language)
+        return u'&quot;%s&quot;' % v
+
+    def qname(x, g):
+        try:
+            q = g.compute_qname(x)
+            return q[0] + ":" + q[2]
+        except:
+            return x
+
+    def color(p):
+        return "BLACK"
+
+    stream.write(u"digraph { \n node [ fontname=\"DejaVu Sans\" ] ; \n")
+
+    for s, p, o in g:
+        sn = node(s)
+        if p == rdflib.RDFS.label:
+            continue
+        if isinstance(o, (rdflib.URIRef, rdflib.BNode)):
+            on = node(o)
+            opstr = u"\t%s -> %s [ color=%s, label=< <font point-size='10'" + \
+                    u"color='#336633'>%s</font> > ] ;\n"
+            stream.write(opstr % (sn, on, color(p), qname(p, g)))
+        else:
+            fields[sn].add((qname(p, g), formatliteral(o, g)))
+
+    for u, n in nodes.items():
+        stream.write(u"# %s %s\n" % (u, n))
+        f = [u"<tr><td align='left'>%s</td><td align='left'>%s</td></tr>" %
+             x for x in sorted(fields[n])]
+        opstr = u"%s [ shape=none, color=%s label=< <table color='#666666'" + \
+                u" cellborder='0' cellspacing='0' border='1'><tr>" + \
+                u"<td colspan='2' bgcolor='grey'><B>%s</B></td></tr><tr>" + \
+                u"<td href='%s' bgcolor='#eeeeee' colspan='2'>" + \
+                u"<font point-size='10' color='#6666ff'>%s</font></td>" + \
+                u"</tr>%s</table> > ] \n"
+        stream.write(opstr % (n, NODECOLOR, label(u, g), u, u, u"".join(f)))
+
+    stream.write("}\n")
+
+
+def _help():
+    sys.stderr.write("""
+rdf2dot.py [-f <format>] files...
+Read RDF files given on STDOUT, writes a graph of the RDFS schema in DOT
+language to stdout
+-f specifies parser to use, if not given,
+
+""")
+
+
+def main():
+    rdflib.extras.cmdlineutils.main(rdf2dot, _help)
+
+if __name__ == '__main__':
+    main()