I started writing a turtle DSL for Scala. It's really pretty simple at present.
I was wondering how we could get it to improve. See
http://programming-scala.labs.oreilly.com/ch11.html for example
/** Apache licence of course */
package org.apache.clerezza.rdf.scala.utils
import org.apache.clerezza.rdf.core._
import collection.mutable.Queue
import impl.{SimpleMGraph, PlainLiteralImpl, TripleImpl}
import org.apache.clerezza.rdf.ontologies.FOAF
object Test {
val g = new MutableGraphNode(new SimpleMGraph)
g.bnode.rel(FOAF.knows).to("http://bblfish.net/#hjs";).colon.
to("http://reto.com/#me";).semicolon.
rel(FOAF.name).to("Joe Schmidt").dot
}
/*
It would be nice if one could write the above without the dots, like this
perhaps
g bnode rel(FOAF.knows) to("http://bblfish.net/#hjs";) colon.
to("http://reto.com/#me";) semicolon.
rel(FOAF.name) to("Joe Schmidt") dot
I am trying to get as close to
[] foaf:knows <http://bblfish.net/#hjs>, <http://reto.com/#me>;
foaf:name "Joe Schmidt" .
as possible
*/
class MutableGraphNode(val graph: TripleCollection) {
var currentNode: Resource = _
def bnode : Subject = {
new Subject(new BNode())
}
class Subject(s: NonLiteral) {
val predicates = new Queue[Predicate]
def rel(rel: UriRef): Predicate = add(new Predicate(rel))
def rel(rel: String): Predicate = add(new Predicate(new
UriRef(rel)))
private def add(p: Predicate) = {
predicates += p
p
}
private def save {
for (p <- predicates) p.save
}
class Predicate(r: UriRef) {
val statements = new Queue[FlexiTriple]
def to(obj: Resource): FlexiTriple = add(new
FlexiTriple(obj))
def to(strlit: String): FlexiTriple = add(new
FlexiTriple(new PlainLiteralImpl(strlit)))
def toRef(uri: String) = add(new FlexiTriple(new
UriRef(uri)))
private def add(tr: FlexiTriple) = {
statements += tr
tr
}
private[Subject] def save {
for (s <- statements) s.save
}
class FlexiTriple(obj: Resource) extends
TripleImpl(s,r,obj) {
def dot { Subject.this.save }
def semicolon = Subject.this
def colon = Predicate.this
private[Predicate] def save {
graph.add(this)
}
}
}
}
}
Social Web Architect
http://bblfish.net/
