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markviz.py
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"""
markviz - Browser-based visualizer of an RDF file
Works best on smallish RDF, since visualizes all of it.
Author: Mark Wallace
"""
import sys
import rdflib
def main():
"""
The main program
"""
file = sys.argv[1]
g = rdflib.Graph()
loadGraphFromFile(g,file)
print(html_pre)
rdf2cy(g)
print(html_post)
#--------------------------------------------
# Global vars
#--------------------------------------------
ns = [
["rdf:", "http://www.w3.org/1999/02/22-rdf-syntax-ns#"],
["rdfs:", "http://www.w3.org/2000/01/rdf-schema#"],
["xsd:", "http://www.w3.org/2001/XMLSchema#"],
["owl:", "http://www.w3.org/2002/07/owl#"],
["dc:", "http://purl.org/dc/elements/1.1/"],
["skos:", "http://www.w3.org/2004/02/skos/core#"],
["gist:", "http://ontologies.semanticarts.com/gist/"]
]
#--------------------------------------------
# Functions
#--------------------------------------------
def rdf2cy(g):
"""
Print Cytoscape JS statements directly from RDF graph
"""
for subj,pred,obj in g:
subj = toQname(subj)
pred = toQname(pred)
obj = toQname(obj)
# Skip annoying owl:NamedIndividual in visualizations
if obj.endswith("NamedIndividual"):
continue
# handle possible single quotes in data properties
obj = obj.replace("'","\\'")
# write subject nodes
s = " { data: { id: '"
s += subj
s += "'}},"
print(s)
# write object nodes
s = " { data: { id: '"
s += obj
s += "'}},"
print(s)
# write edges
s = " { data: { source: '"
s += subj
s += "', target: '"
s += obj
s += "', relname: '"
s += pred
s += "'}},"
print(s)
return None
def toQname(str):
"""
Convert long URIs to QNames where possible.
Uses global 'ns' variable.
"""
# try to put in ns prefix
for obj in ns:
str = str.replace(obj[1],obj[0])
# shorten it if ns didn't match
str = str[str.rfind("#")+1:]
str = str[str.rfind("/")+1:]
return str
def loadGraphFromFile(g,file):
""" Load RDF graph from a local file or URL
"""
if file.upper().endswith("TTL"):
g.parse(file,format="ttl")
else:
g.parse(file)
#--------------------------------------------
# Preformatted HTML for output
#--------------------------------------------
html_pre = """<!DOCTYPE html>
<html>
<head>
<meta name="description" content="[An example of getting started with Cytoscape.js]" />
<meta charset=utf-8 />
<meta name="viewport" content="user-scalable=no, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, minimal-ui">
<title>MarkViz</title>
<style>
body { font: 14px helvetica neue, helvetica, arial, sans-serif; }
#cy { height: 100%; width: 100%; position: absolute; left: 0; top: 0; }
#info { color: #c88; font-size: 1em; position: absolute; z-index: -1; left: 1em; top: 1em; }
</style>
<script src="https://cdnjs.cloudflare.com/ajax/libs/cytoscape/2.7.15/cytoscape.min.js"></script>
<script src="cytoscape.min.js"></script>
<script>
document.addEventListener('DOMContentLoaded', function(){ // on dom ready
var cy = cytoscape({
container: document.getElementById('cy'),
boxSelectionEnabled: false,
autounselectify: true,
style: cytoscape.stylesheet()
.selector('node')
.css({
'content': 'data(id)', // Nodes use id for label for now
'text-valign': 'center',
'background-color': '#999',
})
.selector('edge')
.css({
'content': 'data(relname)', // Edges use name for label, if no name, then no label. :)
'curve-style': 'bezier',
'target-arrow-shape': 'triangle',
'target-arrow-color': '#ccc',
'line-color': '#ccc',
'color': 'lightblue',
'font-size': '12px',
'width': 1
})
.selector(':selected')
.css({
'background-color': 'black',
'line-color': 'black',
'target-arrow-color': 'black',
'source-arrow-color': 'black'
})
.selector('.faded')
.css({
'opacity': 0.25,
'text-opacity': 0
}),
elements: [
// *** DATA ELEMENTS GO BETWEEN THESE COMMENTS ***
//
"""
html_post="""
//
// *** DATA ELEMENTS GO BETWEEN THESE COMMENTS ***
],
layout: {
name: 'cose', // values; cose, random, grid, circle, concentric, breadthfirst,
padding: 10,
randomize: true
}
});
cy.on('tap', 'node', function(e){
var node = e.cyTarget;
var neighborhood = node.neighborhood().add(node);
cy.elements().addClass('faded');
neighborhood.removeClass('faded');
});
cy.on('tap', function(e){
if( e.cyTarget === cy ){
cy.elements().removeClass('faded');
}
});
}); // on dom ready
</script>
</head>
<body>
<div id="cy"></div>
</body>
</html>
"""
#--------------------------------------------
# Run main?
#--------------------------------------------
if __name__ == "__main__":
main()