/// <exception cref="JsonLD.Core.JsonLdError"></exception>
private void ValidateIRI(TurtleRDFParser.State state, string iri)
{
if (!IrirefMinusContainer.Matcher(iri).Matches())
{
throw new JsonLdError(JsonLdError.Error.ParseError, "Error while parsing Turtle; invalid IRI after escaping. {line: "
+ state.lineNumber + "position: " + state.linePosition + "}");
}
}
/// <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"
);
}
RDFDataset result = new RDFDataset();
TurtleRDFParser.State state = new TurtleRDFParser.State(this, (string)input);
while (!string.Empty.Equals(state.line))
{
// check if line is a directive
Matcher match = TurtleRDFParser.Regex.Directive.Matcher(state.line);
if (match.Find())
{
if (match.Group(1) != null || match.Group(4) != null)
{
string ns = match.Group(1) != null?match.Group(1) : match.Group(4);
string 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
{
string @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 = TurtleRDFParser.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
string ns = match.Group(2);
string 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)
{
// matched BNODE
iri = state.namer.GetName(match.Group(0).Trim());
}
else
{
// matched anon node
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("["))
{
string bnode = state.namer.GetName();
state.AdvanceLinePosition(1);
state.Push();
state.curSubject = bnode;
}
else
{
// handle collections
if (state.line.StartsWith("("))
{
string 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 = TurtleRDFParser.Regex.Predicate.Matcher(state.line);
if (match.Find())
{
string 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
string ns = match.Group(2);
string 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
{
// matched "a"
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("["))
{
string 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
string 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 = TurtleRDFParser.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
string ns = match.Group(2);
string 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)
{
// matched BNODE
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
string 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
bool 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;
}
bool expectDotOrPred = false;
// match end of bnode
if (state.line.StartsWith("]"))
{
string 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;
}
else
{
if (expectDotOrPred)
{
// we're expecting another predicate since we didn't find a dot
continue;
}
}
// if we're in a collection
if (JSONLDConsts.RdfFirst.Equals(state.curPredicate))
{
string bnode = state.namer.GetName();
result.AddTriple(state.curSubject, JSONLDConsts.RdfRest, bnode);
state.curSubject = bnode;
continue;
}
if (collectionClosed)
{
// we expect another object
// TODO: it's not clear yet if this is valid
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);
}
