"""
A commandline tool for drawing RDF graphs in Graphviz DOT format
You can draw the graph of an RDF file directly:
.. code-block: bash
rdf2dot my_rdf_file.rdf | dot -Tpng | display
"""
from __future__ import absolute_import
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"
[docs]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'"%s"^^%s' % (v, qname(l.datatype, g))
elif l.language:
return u'"%s"@%s' % (v, l.language)
return u'"%s"' % 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,
""")
[docs]def main():
rdflib.extras.cmdlineutils.main(rdf2dot, _help)
if __name__ == '__main__':
main()
