// this shouldn't be a
// valid iri/bnode i
// hope!
// TODO: fill with default namespaces
public virtual object Call(RdfDataset dataset)
{
foreach (var e in dataset.GetNamespaces().GetEnumerableSelf
())
{
availableNamespaces[e.Value] = e.Key;
}
usedNamespaces = new HashSet <string>();
var refs = new JObject();
var ttl = new JObject();
foreach (var graphName in dataset.Keys)
{
var localGraphName = graphName;
var triples = dataset.GetQuads(localGraphName);
if ("@default".Equals(localGraphName))
{
localGraphName = null;
}
// http://www.w3.org/TR/turtle/#unlabeled-bnodes
// TODO: implement nesting for unlabled nodes
// map of what the output should look like
// subj (or [ if bnode) > pred > obj
// > obj (set ref if IRI)
// > pred > obj (set ref if bnode)
// subj > etc etc etc
// subjid -> [ ref, ref, ref ]
var prevSubject = string.Empty;
var prevPredicate = string.Empty;
JObject thisSubject = null;
JArray thisPredicate = null;
foreach (var triple in triples)
{
var subject = triple.GetSubject().GetValue();
var predicate = triple.GetPredicate().GetValue();
if (prevSubject.Equals(subject))
{
if (prevPredicate.Equals(predicate))
{
}
else
{
// nothing to do
// new predicate
if (thisSubject.ContainsKey(predicate))
{
thisPredicate = (JArray)thisSubject[predicate];
}
else
{
thisPredicate = new JArray();
thisSubject[predicate] = thisPredicate;
}
prevPredicate = predicate;
}
}
else
{
// new subject
if (ttl.ContainsKey(subject))
{
thisSubject = (JObject)ttl[subject];
}
else
{
thisSubject = new JObject();
ttl[subject] = thisSubject;
}
if (thisSubject.ContainsKey(predicate))
{
thisPredicate = (JArray)thisSubject[predicate];
}
else
{
thisPredicate = new JArray();
thisSubject[predicate] = thisPredicate;
}
prevSubject = subject;
prevPredicate = predicate;
}
if (triple.GetObject().IsLiteral())
{
thisPredicate.Add(triple.GetObject());
}
else
{
var o = triple.GetObject().GetValue();
if (o.StartsWith("_:"))
{
// add ref to o
if (!refs.ContainsKey(o))
{
refs[o] = new JArray();
}
((JArray)refs[o]).Add(thisPredicate);
}
thisPredicate.Add(o);
}
}
}
var collections = new JObject();
var subjects = new JArray(ttl.GetKeys());
// find collections
foreach (string subj in subjects)
{
var preds = (JObject)ttl[subj];
if (preds != null && preds.ContainsKey(JsonLdConsts.RdfFirst))
{
var col = new JArray();
collections[subj] = col;
while (true)
{
var first = (JArray)Collections.Remove(preds, JsonLdConsts.RdfFirst);
var o = first[0];
col.Add(o);
// refs
if (refs.ContainsKey((string)o))
{
((JArray)refs[(string)o]).Remove(first);
((JArray)refs[(string)o]).Add(col);
}
var next = (string)Collections.Remove(preds, JsonLdConsts.RdfRest)[0
];
if (JsonLdConsts.RdfNil.Equals(next))
{
break;
}
// if collections already contains a value for "next", add
// it to this col and break out
if (collections.ContainsKey(next))
{
Collections.AddAll(col, (JArray)Collections.Remove(collections, next));
break;
}
preds = (JObject)Collections.Remove(ttl, next);
Collections.Remove(refs, next);
}
}
}
// process refs (nesting referenced bnodes if only one reference to them
// in the whole graph)
foreach (var id in refs.GetKeys())
{
// skip items if there is more than one reference to them in the
// graph
if (((JArray)refs[id]).Count > 1)
{
continue;
}
// otherwise embed them into the referenced location
var @object = Collections.Remove(ttl, id);
if (collections.ContainsKey(id))
{
@object = new JObject();
var tmp = new JArray();
tmp.Add(Collections.Remove(collections, id));
((JObject)@object)[ColsKey] = tmp;
}
var predicate = (JArray)refs[id][0];
// replace the one bnode ref with the object
predicate[predicate.LastIndexOf(id)] = @object;
}
// replace the rest of the collections
foreach (var id_1 in collections.GetKeys())
{
var subj_1 = (JObject)ttl[id_1];
if (!subj_1.ContainsKey(ColsKey))
{
subj_1[ColsKey] = new JArray();
}
((JArray)subj_1[ColsKey]).Add(collections[id_1]);
}
// build turtle output
var output = GenerateTurtle(ttl, 0, 0, false);
var prefixes = string.Empty;
foreach (var prefix in usedNamespaces)
{
var name = availableNamespaces[prefix];
prefixes += "@prefix " + name + ": <" + prefix + "> .\n";
}
return((string.Empty.Equals(prefixes) ? string.Empty : prefixes + "\n") + output);
}
public virtual object Call(RdfDataset dataset)
{
return(RdfDatasetUtils.ToNQuads(dataset));
}
/// <exception cref="JsonLD.Core.JsonLdError"></exception>
public virtual RdfDataset Parse(JToken input)
{
if (!(input.Type == JTokenType.String))
{
throw new JsonLdError(JsonLdError.Error.InvalidInput,
"Invalid input; Triple RDF Parser requires a string input"
);
}
var result = new RdfDataset();
var state = new State(this, (string)input);
while (!string.Empty.Equals(state.line))
{
// check if line is a directive
var match = Regex.Directive.Matcher(state.line);
if (match.Find())
{
if (match.Group(1) != null || match.Group(4) != null)
{
var ns = match.Group(1) != null?match.Group(1) : match.Group(4);
var iri = match.Group(1) != null?match.Group(2) : match.Group(5);
if (!iri.Contains(":"))
{
iri = state.baseIri + iri;
}
iri = RdfDatasetUtils.Unescape(iri);
ValidateIRI(state, iri);
state.namespaces[ns] = iri;
result.SetNamespace(ns, iri);
}
else
{
var @base = match.Group(3) != null?match.Group(3) : match.Group(6);
@base = RdfDatasetUtils.Unescape(@base);
ValidateIRI(state, @base);
if ([email protected](":"))
{
state.baseIri = state.baseIri + @base;
}
else
{
state.baseIri = @base;
}
}
state.AdvanceLinePosition(match.Group(0).Length);
continue;
}
if (state.curSubject == null)
{
// we need to match a subject
match = Regex.Subject.Matcher(state.line);
if (match.Find())
{
string iri;
if (match.Group(1) != null)
{
// matched IRI
iri = RdfDatasetUtils.Unescape(match.Group(1));
if (!iri.Contains(":"))
{
iri = state.baseIri + iri;
}
}
else
{
if (match.Group(2) != null)
{
// matched NS:NAME
var ns = match.Group(2);
var name = UnescapeReserved(match.Group(3));
iri = state.ExpandIRI(ns, name);
}
else
{
if (match.Group(4) != null)
{
// match ns: only
iri = state.ExpandIRI(match.Group(4), string.Empty);
}
else
{
if (match.Group(5) != null)
{
iri = state.namer.GetName(match.Group(0).Trim());
}
else
{
iri = state.namer.GetName();
}
}
}
}
// make sure IRI still matches an IRI after escaping
ValidateIRI(state, iri);
state.curSubject = iri;
state.AdvanceLinePosition(match.Group(0).Length);
}
else
{
// handle blank nodes
if (state.line.StartsWith("["))
{
var bnode = state.namer.GetName();
state.AdvanceLinePosition(1);
state.Push();
state.curSubject = bnode;
}
else
{
// handle collections
if (state.line.StartsWith("("))
{
var bnode = state.namer.GetName();
// so we know we want a predicate if the collection close
// isn't followed by a subject end
state.curSubject = bnode;
state.AdvanceLinePosition(1);
state.Push();
state.curSubject = bnode;
state.curPredicate = JsonLdConsts.RdfFirst;
}
else
{
// make sure we have a subject already
throw new JsonLdError(JsonLdError.Error.ParseError,
"Error while parsing Turtle; missing expected subject. {line: "
+ state.lineNumber + "position: " + state.linePosition + "}");
}
}
}
}
if (state.curPredicate == null)
{
// match predicate
match = Regex.Predicate.Matcher(state.line);
if (match.Find())
{
var iri = string.Empty;
if (match.Group(1) != null)
{
// matched IRI
iri = RdfDatasetUtils.Unescape(match.Group(1));
if (!iri.Contains(":"))
{
iri = state.baseIri + iri;
}
}
else
{
if (match.Group(2) != null)
{
// matched NS:NAME
var ns = match.Group(2);
var name = UnescapeReserved(match.Group(3));
iri = state.ExpandIRI(ns, name);
}
else
{
if (match.Group(4) != null)
{
iri = state.ExpandIRI(match.Group(4), string.Empty);
}
else
{
iri = JsonLdConsts.RdfType;
}
}
}
ValidateIRI(state, iri);
state.curPredicate = iri;
state.AdvanceLinePosition(match.Group(0).Length);
}
else
{
throw new JsonLdError(JsonLdError.Error.ParseError,
"Error while parsing Turtle; missing expected predicate. {line: "
+ state.lineNumber + "position: " + state.linePosition + "}");
}
}
// expecting bnode or object
// match BNODE values
if (state.line.StartsWith("["))
{
var bnode = state.namer.GetName();
result.AddTriple(state.curSubject, state.curPredicate, bnode);
state.AdvanceLinePosition(1);
// check for anonymous objects
if (state.line.StartsWith("]"))
{
state.AdvanceLinePosition(1);
}
else
{
// next we expect a statement or object separator
// otherwise we're inside the blank node
state.Push();
state.curSubject = bnode;
// next we expect a predicate
continue;
}
}
else
{
// match collections
if (state.line.StartsWith("("))
{
state.AdvanceLinePosition(1);
// check for empty collection
if (state.line.StartsWith(")"))
{
state.AdvanceLinePosition(1);
result.AddTriple(state.curSubject, state.curPredicate, JsonLdConsts.RdfNil);
}
else
{
// next we expect a statement or object separator
// otherwise we're inside the collection
var bnode = state.namer.GetName();
result.AddTriple(state.curSubject, state.curPredicate, bnode);
state.Push();
state.curSubject = bnode;
state.curPredicate = JsonLdConsts.RdfFirst;
continue;
}
}
else
{
// match object
match = Regex.Object.Matcher(state.line);
if (match.Find())
{
string iri = null;
if (match.Group(1) != null)
{
// matched IRI
iri = RdfDatasetUtils.Unescape(match.Group(1));
if (!iri.Contains(":"))
{
iri = state.baseIri + iri;
}
}
else
{
if (match.Group(2) != null)
{
// matched NS:NAME
var ns = match.Group(2);
var name = UnescapeReserved(match.Group(3));
iri = state.ExpandIRI(ns, name);
}
else
{
if (match.Group(4) != null)
{
// matched ns:
iri = state.ExpandIRI(match.Group(4), string.Empty);
}
else
{
if (match.Group(5) != null)
{
iri = state.namer.GetName(match.Group(0).Trim());
}
}
}
}
if (iri != null)
{
ValidateIRI(state, iri);
// we have a object
result.AddTriple(state.curSubject, state.curPredicate, iri);
}
else
{
// we have a literal
var value = match.Group(6);
string lang = null;
string datatype = null;
if (value != null)
{
// we have a string literal
value = UnquoteString(value);
value = RdfDatasetUtils.Unescape(value);
lang = match.Group(7);
if (lang == null)
{
if (match.Group(8) != null)
{
datatype = RdfDatasetUtils.Unescape(match.Group(8));
if (!datatype.Contains(":"))
{
datatype = state.baseIri + datatype;
}
ValidateIRI(state, datatype);
}
else
{
if (match.Group(9) != null)
{
datatype = state.ExpandIRI(match.Group(9), UnescapeReserved(match.Group(10)));
}
else
{
if (match.Group(11) != null)
{
datatype = state.ExpandIRI(match.Group(11), string.Empty);
}
}
}
}
else
{
datatype = JsonLdConsts.RdfLangstring;
}
}
else
{
if (match.Group(12) != null)
{
// integer literal
value = match.Group(12);
datatype = JsonLdConsts.XsdDouble;
}
else
{
if (match.Group(13) != null)
{
// decimal literal
value = match.Group(13);
datatype = JsonLdConsts.XsdDecimal;
}
else
{
if (match.Group(14) != null)
{
// double literal
value = match.Group(14);
datatype = JsonLdConsts.XsdInteger;
}
else
{
if (match.Group(15) != null)
{
// boolean literal
value = match.Group(15);
datatype = JsonLdConsts.XsdBoolean;
}
}
}
}
}
result.AddTriple(state.curSubject, state.curPredicate, value, datatype, lang);
}
state.AdvanceLinePosition(match.Group(0).Length);
}
else
{
throw new JsonLdError(JsonLdError.Error.ParseError,
"Error while parsing Turtle; missing expected object or blank node. {line: "
+ state.lineNumber + "position: " + state.linePosition + "}");
}
}
}
// close collection
var collectionClosed = false;
while (state.line.StartsWith(")"))
{
if (!JsonLdConsts.RdfFirst.Equals(state.curPredicate))
{
throw new JsonLdError(JsonLdError.Error.ParseError,
"Error while parsing Turtle; unexpected ). {line: "
+ state.lineNumber + "position: " + state.linePosition + "}");
}
result.AddTriple(state.curSubject, JsonLdConsts.RdfRest, JsonLdConsts.RdfNil);
state.Pop();
state.AdvanceLinePosition(1);
collectionClosed = true;
}
var expectDotOrPred = false;
// match end of bnode
if (state.line.StartsWith("]"))
{
var bnode = state.curSubject;
state.Pop();
state.AdvanceLinePosition(1);
if (state.curSubject == null)
{
// this is a bnode as a subject and we
// expect either a . or a predicate
state.curSubject = bnode;
expectDotOrPred = true;
}
}
// match list separator
if (!expectDotOrPred && state.line.StartsWith(","))
{
state.AdvanceLinePosition(1);
// now we expect another object/bnode
continue;
}
// match predicate end
if (!expectDotOrPred)
{
while (state.line.StartsWith(";"))
{
state.curPredicate = null;
state.AdvanceLinePosition(1);
// now we expect another predicate, or a dot
expectDotOrPred = true;
}
}
if (state.line.StartsWith("."))
{
if (state.expectingBnodeClose)
{
throw new JsonLdError(JsonLdError.Error.ParseError,
"Error while parsing Turtle; missing expected )\"]\". {line: "
+ state.lineNumber + "position: " + state.linePosition + "}");
}
state.curSubject = null;
state.curPredicate = null;
state.AdvanceLinePosition(1);
// this can now be the end of the document.
continue;
}
if (expectDotOrPred)
{
continue;
}
// if we're in a collection
if (JsonLdConsts.RdfFirst.Equals(state.curPredicate))
{
var bnode = state.namer.GetName();
result.AddTriple(state.curSubject, JsonLdConsts.RdfRest, bnode);
state.curSubject = bnode;
continue;
}
if (collectionClosed)
{
continue;
}
// if we get here, we're missing a close statement
throw new JsonLdError(JsonLdError.Error.ParseError,
"Error while parsing Turtle; missing expected \"]\" \",\" \";\" or \".\". {line: "
+ state.lineNumber + "position: " + state.linePosition + "}");
}
return(result);
}