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support for blank nodes #1

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support for blank nodes #1

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44 changes: 37 additions & 7 deletions index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -24,20 +24,30 @@ function serializeXML(graph, done) {
})

var subjectNodes = Object.create(null)
var blankNodes = Object.create(null)

graph.forEach(serializeTriple)

function serializeTriple(triple) {

if(triple.subject.interfaceName !== 'NamedNode')
throw new Error('triple subject must be a NamedNode')
var subject,
subjectNode;
if (triple.subject.interfaceName === 'BlankNode') {
subject = triple.subject.nominalValue

var subject = triple.subject.nominalValue
subjectNode = blankNodes[subject]

var subjectNode = subjectNodes[subject]
if (subjectNode === undefined)
subjectNode = blankNodes[subject] = []
}
else {
subject = triple.subject.nominalValue

subjectNode = subjectNodes[subject]

if(subjectNode === undefined)
subjectNode = subjectNodes[subject] = []
if (subjectNode === undefined)
subjectNode = subjectNodes[subject] = []
}

if(triple.predicate.interfaceName !== 'NamedNode')
throw new Error('predicate must be a NamedNode')
Expand All @@ -60,6 +70,13 @@ function serializeXML(graph, done) {
}
}

case 'BlankNode':
return {
_attr: {
'rdf:nodeID': "_:" + object.nominalValue
}
}

case 'Literal':

if(object.datatype.interfaceName !== 'NamedNode')
Expand Down Expand Up @@ -140,6 +157,19 @@ function serializeXML(graph, done) {
].concat(subjectNodes[subject])
}
})
).concat(
Object.keys(blankNodes)
.map(function (subject) {
return {
'rdf:Description': [
{
_attr: {
'rdf:nodeID': "_:" + subject
}
}
].concat(blankNodes[subject])
}
})
)
}, {
declaration: true,
Expand All @@ -160,7 +190,7 @@ XMLSerializer.prototype.serialize = serializeXML
var instance = new XMLSerializer()

for (var property in instance) {
XMLSerializer[property] = instance[property]
XMLSerializer[property] = instance[property]
}

module.exports = XMLSerializer
Expand Down