public virtual void TestStatementsWithNamedBNode()
{
BNode bNode = new BNode("node");
TurtleWriter instance = CreateInstance();
instance.Add(new Statement(bNode, "b", (Entity)"C"));
instance.Close();
string expected = bNode + " <b> <C>.";
Assert.AreEqual(expected, writer.ToString());
}
public void TestFormulaMultipleOccurences()
{
N3Writer instance = (N3Writer)CreateInstance();
BNode statementId = new BNode();
instance.Add(new Statement("S", "p", (Entity)"O", statementId));
instance.Add(new Statement("MyTheory", "contains", statementId));
instance.Add(new Statement(statementId, "is", (Entity)"True"));
instance.Close();
string expected = "<MyTheory> <contains> {<S> <p> <O>.}.\n{<S> <p> <O>.} <is> <True>.";
Assert.AreEqual(expected, writer.ToString());
}
public void TestFormulaSingleOccurence()
{
N3Writer instance = (N3Writer)CreateInstance();
BNode statementXId = new BNode();
BNode statementYId = new BNode();
instance.Add(new Statement("S", "p", (Entity)"X", statementXId));
instance.Add(new Statement("S", "p", (Entity)"Y", statementYId));
instance.Add(new Statement(statementXId, Predicate.LogImplies, statementYId));
instance.Close();
string expected = "{<S> <p> <X>.} => {<S> <p> <Y>.}.";
Assert.AreEqual(expected, writer.ToString());
}
public void TestFormulaMixedWithRegularStatements()
{
N3Writer instance = (N3Writer)CreateInstance();
BNode statementXId = new BNode();
BNode statementYId = new BNode();
instance.Add(new Statement("S", "b", (Entity)"B"));
instance.Add(new Statement("S", "p", (Entity)"X", statementXId));
instance.Add(new Statement("S", "p", (Entity)"Y", statementYId));
instance.Add(new Statement(statementXId, Predicate.LogImplies, statementYId));
instance.Close();
string expected = "<S> <b> <B>.\n{<S> <p> <X>.} => {<S> <p> <Y>.}.";
Assert.AreEqual(expected, writer.ToString());
}
public void TestWriteFormulaWithOneStatement()
{
NTriplesWriter instance = new NTriplesWriter(writer);
BNode statementId = new BNode("s");
instance.Add(new Statement("A", "b", (Entity)"C", statementId));
instance.Close();
string expected = "_:s <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/2000/10/swap/log#Formula>.\n" +
"_:s <http://www.w3.org/2000/10/swap/log#includes> _:bnode.\n" +
"_:bnode <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/1999/02/22-rdf-syntax-ns#Statement>.\n" +
"_:bnode <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <A>.\n" +
"_:bnode <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <b>.\n" +
"_:bnode <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <C>.\n";
Assert.AreEqual(expected, Regex.Replace(writer.ToString(), @"_:bnode\d+", "_:bnode"));
}
public void TestFormulaWithinFormula()
{
N3Writer instance = (N3Writer)CreateInstance();
BNode statementXId = new BNode();
BNode statementYId = new BNode();
BNode statementImplId = new BNode();
instance.Add(new Statement("S", "p", (Entity)"X", statementXId));
instance.Add(new Statement("S", "p", (Entity)"Y", statementYId));
instance.Add(new Statement(statementXId, Predicate.LogImplies, statementYId, statementImplId));
instance.Add(new Statement(statementImplId, Predicate.LogImplies, (Entity)"Truth"));
instance.Close();
string expected = "{\n{<S> <p> <X>.}\n=>\n{<S> <p> <Y>.}.\n} => <Truth>.";
Assert.AreEqual(expected, writer.ToString());
}
public static void Main()
{
// Create the instance data
MemoryStore dataModel = new MemoryStore();
BNode me = new BNode("me");
BNode you = new BNode("you");
Entity rdfType = "http://www.w3.org/1999/02/22-rdf-syntax-ns#type";
Entity rdfsLabel= "http://www.w3.org/2000/01/rdf-schema#label";
Entity foafPerson = "http://xmlns.com/foaf/0.1/Person";
Entity foafAgent = "http://xmlns.com/foaf/0.1/Agent";
Entity foafName = "http://xmlns.com/foaf/0.1/name";
dataModel.Add(new Statement(me, rdfType, foafPerson));
dataModel.Add(new Statement(you, rdfType, foafPerson));
dataModel.Add(new Statement(me, foafName, (Literal)"John Doe"));
dataModel.Add(new Statement(you, foafName, (Literal)"Sam Smith"));
// Create the RDFS engine and apply it to the data model.
RDFS engine = new RDFS();
engine.LoadSchema(RdfReader.LoadFromUri(new Uri("http://xmlns.com/foaf/0.1/index.rdf")));
dataModel.AddReasoner(engine);
// Query the data model
// Ask for who are typed as Agents. Note that the people are
// typed as foaf:Person, and the schema asserts that foaf:Person
// is a subclass of foaf:Agent.
Console.WriteLine("Who are Agents?");
foreach (Entity r in dataModel.SelectSubjects(rdfType, foafAgent))
Console.WriteLine("\t" + r);
// Ask for the rdfs:labels of everyone. Note that the data model
// has foaf:names for the people, and the schema asserts that
// foaf:name is a subproperty of rdfs:label.
Console.WriteLine("People's labels:");
foreach (Statement s in dataModel.Select(new Statement(null, rdfsLabel, null)))
Console.WriteLine("\t" + s);
}
public static void Main()
{
MemoryStore store = new MemoryStore();
Entity computer = new Entity("http://example.org/computer");
Entity says = "http://example.org/says";
Entity wants = "http://example.org/wants";
Entity desire = new BNode();
Entity description = new Entity("http://example.org/description");
store.Add(new Statement(computer, says, (Literal)"Hello world!"));
store.Add(new Statement(computer, wants, desire));
store.Add(new Statement(desire, description, (Literal)"to be human"));
store.Add(new Statement(desire, RDF+"type", (Entity)"http://example.org/Desire"));
using (RdfWriter writer = new RdfXmlWriter(Console.Out)) {
writer.Namespaces.AddNamespace("http://example.org/", "ex");
writer.Write(store);
}
}
public static void Add(StatementSink sink, Entity subject, string predicate, string type, string [] values)
{
if (values == null)
{
System.Console.WriteLine("{0} has no values; skipping", predicate);
return;
}
Entity empty = new SemWeb.BNode();
Statement top = new Statement(subject, (Entity)MetadataStore.Namespaces.Resolve(predicate), empty);
Statement desc = new Statement(empty,
(Entity)MetadataStore.Namespaces.Resolve("rdf:type"),
(Entity)MetadataStore.Namespaces.Resolve(type));
sink.Add(desc);
foreach (string value in values)
{
Statement literal = new Statement(empty,
(Entity)MetadataStore.Namespaces.Resolve("rdf:li"),
new SemWeb.Literal(value, null, null));
sink.Add(literal);
}
sink.Add(top);
}
private Entity GetBlankNode(string nodeID) {
if (blankNodes.ContainsKey(nodeID))
return (Entity)blankNodes[nodeID];
Entity entity = new BNode(nodeID);
blankNodes[nodeID] = entity;
return entity;
}
public static void AddLiteral (StatementSink sink, string predicate, string type, SemWeb.Literal value)
{
Entity empty = new BNode ();
Statement top = new Statement (FSpotXMPBase, (Entity)MetadataStore.Namespaces.Resolve (predicate), empty);
Statement desc = new Statement (empty,
(Entity)MetadataStore.Namespaces.Resolve ("rdf:type"),
(Entity)MetadataStore.Namespaces.Resolve (type));
sink.Add (desc);
Statement literal = new Statement (empty,
(Entity)MetadataStore.Namespaces.Resolve ("rdf:li"),
value);
sink.Add (literal);
sink.Add (top);
}
public void TestFormulaWithMultipleStatementsSingleOccurence()
{
N3Writer instance = (N3Writer)CreateInstance();
BNode formulaId = new BNode();
BNode statementZId = new BNode();
instance.Add(new Statement("S", "p", (Entity)"X", formulaId));
instance.Add(new Statement("S", "p", (Entity)"Y", formulaId));
instance.Add(new Statement("S", "p", (Entity)"Z", statementZId));
instance.Add(new Statement(formulaId, Predicate.LogImplies, statementZId));
instance.Close();
string expected = "{\n <S> <p> <X>.\n <S> <p> <Y>.\n} => {<S> <p> <Z>.}.";
Assert.AreEqual(expected, writer.ToString());
}
public BNodeWrapper(BNode res)
{
r = res;
}
public void SelectDirectory (ImageDirectory dir, StatementSink sink)
{
foreach (DirectoryEntry e in dir.Entries) {
#if DEBUG_LOADER
System.Console.WriteLine ("{0}", e.Id);
#endif
switch (e.Id) {
case TagId.IPTCNAA:
System.IO.Stream iptcstream = new System.IO.MemoryStream (e.RawData);
FSpot.Iptc.IptcFile iptc = new FSpot.Iptc.IptcFile (iptcstream);
iptc.Select (sink);
break;
case TagId.PhotoshopPrivate:
System.IO.Stream bimstream = new System.IO.MemoryStream (e.RawData);
FSpot.Bim.BimFile bim = new FSpot.Bim.BimFile (bimstream);
bim.Select (sink);
break;
case TagId.XMP:
System.IO.Stream xmpstream = new System.IO.MemoryStream (e.RawData);
FSpot.Xmp.XmpFile xmp = new FSpot.Xmp.XmpFile (xmpstream);
xmp.Select (sink);
break;
case TagId.ImageDescription:
MetadataStore.AddLiteral (sink, "dc:description", "rdf:Alt",
new Literal (e.ValueAsString [0], "x-default", null));
break;
case TagId.UserComment:
MetadataStore.AddLiteral (sink, "exif:UserComment", "rdf:Alt",
new Literal (e.ValueAsString [0], "x-default", null));
break;
case TagId.Copyright:
MetadataStore.AddLiteral (sink, "dc:rights", "rdf:Alt",
new Literal (e.ValueAsString [0], "x-default", null));
break;
case TagId.Artist:
MetadataStore.Add (sink, "dc:creator", "rdf:Seq", e.ValueAsString);
break;
case TagId.ExifIfdPointer:
try {
ImageDirectory sub = ((SubdirectoryEntry)e).Directory [0];
SelectDirectory (sub, sink);
} catch (System.Exception exc) {
System.Console.WriteLine (exc);
}
break;
case TagId.Software:
MetadataStore.AddLiteral (sink, "xmp:CreatorTool", e.ValueAsString [0]);
break;
case TagId.DateTime:
try {
MetadataStore.AddLiteral (sink, "xmp:ModifyDate",
e.ValueAsDate.ToString ("yyyy-MM-ddThh:mm:ss"));
} catch (System.Exception ex) {
System.Console.WriteLine (String.Format ("error parsing {0}{2}{1}", e.ValueAsString[0], ex, Environment.NewLine));
}
break;
case TagId.DateTimeOriginal:
case TagId.DateTimeDigitized:
// FIXME subsectime needs to be included in these values
// FIXME shouldn't DateTimeOriginal be xmp:CreateDate? the spec says no but wtf?
try {
MetadataStore.AddLiteral (sink, "exif:" + e.Id.ToString (),
e.ValueAsDate.ToString ("yyyy-MM-ddThh:mm:ss"));
} catch (System.Exception ex) {
System.Console.WriteLine (String.Format ("error parsing {0}{2}{1}", e.ValueAsString[0], ex, Environment.NewLine));
}
break;
//case TagId.SpatialFrequencyResponse
case TagId.ExifCFAPattern:
CFAPattern pattern = new CFAPattern (e.RawData, e.IsLittle);
Entity empty = new BNode ();
Statement top = new Statement (MetadataStore.FSpotXMPBase,
(Entity)MetadataStore.Namespaces.Resolve ("exif:" + e.Id.ToString ()),
empty);
Statement cols = new Statement (empty,
(Entity) MetadataStore.Namespaces.Resolve ("exif:Columns"),
new Literal (pattern.Columns.ToString (), null, null));
sink.Add (cols);
Statement rows = new Statement (empty,
(Entity) MetadataStore.Namespaces.Resolve ("exif:Rows"),
new Literal (pattern.Rows.ToString (), null, null));
sink.Add (rows);
string [] vals = e.ArrayToString (pattern.Values);
MetadataStore.Add (sink, empty, "exif:Values", "rdf:Seq", vals);
sink.Add (top);
break;
case TagId.ExifVersion:
case TagId.FlashPixVersion:
case TagId.ColorSpace:
case TagId.CompressedBitsPerPixel:
case TagId.PixelYDimension:
case TagId.PixelXDimension:
case TagId.RelatedSoundFile:
case TagId.ExposureTime:
case TagId.FNumber:
case TagId.ExposureProgram:
case TagId.SpectralSensitivity:
case TagId.ShutterSpeedValue:
case TagId.ApertureValue:
case TagId.BrightnessValue:
case TagId.ExposureBiasValue:
case TagId.MaxApertureValue:
case TagId.SubjectDistance:
case TagId.MeteringMode:
case TagId.LightSource:
case TagId.FocalLength:
case TagId.FlashEnergy:
case TagId.FocalPlaneXResolution:
case TagId.FocalPlaneYResolution:
case TagId.FocalPlaneResolutionUnit:
case TagId.ExposureIndex:
case TagId.SensingMethod:
case TagId.FileSource:
case TagId.SceneType:
case TagId.CustomRendered:
case TagId.ExposureMode:
case TagId.WhiteBalance:
case TagId.DigitalZoomRatio:
case TagId.FocalLengthIn35mmFilm:
case TagId.SceneCaptureType:
case TagId.GainControl:
case TagId.Contrast:
case TagId.Saturation:
case TagId.Sharpness:
MetadataStore.AddLiteral (sink, "exif:" + e.Id.ToString (), e.ValueAsString [0]);
break;
case TagId.ComponentsConfiguration:
case TagId.ISOSpeedRatings:
case TagId.SubjectArea:
case TagId.SubjectLocation:
MetadataStore.Add (sink, "exif:" + e.Id.ToString (), "rdf:Seq", e.ValueAsString);
break;
case TagId.TransferFunction:
case TagId.YCbCrSubSampling:
case TagId.WhitePoint:
case TagId.PrimaryChromaticities:
case TagId.YCbCrCoefficients:
case TagId.ReferenceBlackWhite:
case TagId.BitsPerSample:
MetadataStore.Add (sink, "tiff:" + e.Id.ToString (), "rdf:Seq", e.ValueAsString);
break;
case TagId.Orientation:
case TagId.Compression:
case TagId.PhotometricInterpretation:
case TagId.SamplesPerPixel:
case TagId.PlanarConfiguration:
case TagId.YCbCrPositioning:
case TagId.ResolutionUnit:
case TagId.ImageWidth:
case TagId.ImageLength:
case TagId.Model:
case TagId.Make:
MetadataStore.AddLiteral (sink, "tiff:" + e.Id.ToString (), e.ValueAsString [0]);
break;
}
}
}
private Resource ReadResource2(ParseContext context, out bool reverse)
{
reverse = false;
Location loc = context.Location;
object tok = ReadToken(context.source, context);
if (tok is Literal)
{
return((Literal)tok);
}
string str = (string)tok;
if (str == "")
{
return(null);
}
// @ Keywords
if (str == "@prefix")
{
return(PrefixResource);
}
if (str == "@keywords")
{
return(KeywordsResource);
}
if (context.UsingKeywords && context.Keywords.Contains(str))
{
str = "@" + str;
}
if (!context.UsingKeywords &&
(str == "a" || str == "has" || str == "is"))
{
str = "@" + str;
}
// Standard Keywords
// TODO: Turn these off with @keywords
if (str == "@a")
{
return(entRDFTYPE);
}
if (str == "=")
{
return(entDAMLEQUIV);
}
if (str == "=>")
{
return(entLOGIMPLIES);
}
if (str == "<=")
{
reverse = true;
return(entLOGIMPLIES);
}
if (str == "@has") // ignore this token
{
return(ReadResource2(context, out reverse));
}
if (str == "@is")
{
// Reverse predicate
bool reversetemp;
Resource pred = ReadResource2(context, out reversetemp);
reverse = true;
string of = ReadToken(context.source, context) as string;
if (of == null)
{
OnError("End of stream while expecting 'of'", loc);
}
if (of == "@of" ||
(!context.UsingKeywords && of == "of") ||
(context.UsingKeywords && context.Keywords.Contains("of") && of == "of"))
{
return(pred);
}
OnError("Expecting token 'of' but found '" + of + "'", loc);
return(null); // unreachable
}
if (str.StartsWith("@"))
{
OnError("The " + str + " directive is not supported", loc);
}
// URI
if (str.StartsWith("<") && str.EndsWith(">"))
{
string uri = GetAbsoluteUri(BaseUri, str.Substring(1, str.Length - 2));
return(GetResource(context, uri));
}
// VARIABLE
if (str[0] == '?')
{
string name = str.Substring(1);
Entity var = (Entity)context.variables[name];
if (var == null)
{
var = new Variable(name);
AddVariable((Variable)var);
context.variables[name] = var;
}
return(var);
}
// QNAME
if (str.IndexOf(":") != -1)
{
return(ResolveQName(str, context, loc));
}
// ANONYMOUS
if (str == "[")
{
Entity ret = new BNode();
ReadWhitespace(context.source);
if (context.source.Peek() != ']')
{
char bracket = ReadPredicates(ret, context);
if (bracket == '.')
{
bracket = ReadPunc(context.source);
}
if (bracket != ']')
{
OnError("Expected a close bracket but found '" + bracket + "'", loc);
}
}
else
{
context.source.Read();
}
return(ret);
}
// LIST
if (str == "(")
{
// A list
Entity ent = null;
while (true)
{
bool rev2;
Resource res = ReadResource(context, out rev2);
if (res == null)
{
break;
}
if (ent == null)
{
ent = new BNode();
}
else
{
Entity sub = new BNode();
Add(context.store, new Statement(ent, entRDFREST, sub, context.meta), loc);
ent = sub;
}
Add(context.store, new Statement(ent, entRDFFIRST, res, context.meta), loc);
}
if (ent == null) // No list items.
{
ent = entRDFNIL; // according to Turtle spec
}
else
{
Add(context.store, new Statement(ent, entRDFREST, entRDFNIL, context.meta), loc);
}
return(ent);
}
if (str == ")")
{
return(null); // Should I use a more precise end-of-list return value?
}
// FORMULA
if (str == "{")
{
// ParseContext is a struct, so this gives us a clone.
ParseContext newcontext = context;
// The formula is denoted by a blank node
newcontext.meta = new BNode();
// According to the spec, _:xxx anonymous nodes are
// local to the formula. But ?$variables (which aren't
// mentioned in the spec) are treated as global names.
newcontext.anonymous = new Hashtable();
while (NextPunc(context.source) != '}' && ReadStatement(newcontext))
{
}
ReadWhitespace(context.source);
if (context.source.Peek() == '}')
{
context.source.Read();
}
return(newcontext.meta);
}
// NUMERIC LITERAL
// In Turtle, numbers are restricted to [0-9]+, and are datatyped xsd:integer.
double numval;
if (double.TryParse(str, System.Globalization.NumberStyles.Any, null, out numval))
{
return(new Literal(numval.ToString()));
}
// If @keywords is used, alphanumerics that aren't keywords
// are local names in the default namespace.
if (context.UsingKeywords && char.IsLetter(str[0]))
{
if (BaseUri == null)
{
OnError("The document contains an unqualified name but no BaseUri was specified: \"" + str + "\"", loc);
}
return(GetResource(context, BaseUri + str));
}
// NOTHING MATCHED
OnError("Invalid token: " + str, loc);
return(null);
}
public void Select (SemWeb.StatementSink sink)
{
Entity keywords = null;
foreach (DataSet data in sets) {
switch (data.ID) {
case DataSetID.CopyrightNotice:
MetadataStore.AddLiteral (sink, "dc:rights", "rdf:Alt", new SemWeb.Literal (data.XmpObject, "x-default", null));
break;
case DataSetID.ByLine:
MetadataStore.AddLiteral (sink, "dc:creator", "rdf:Seq", new SemWeb.Literal (data.XmpObject, "x-default", null));
break;
case DataSetID.CaptionAbstract:
MetadataStore.AddLiteral (sink, "dc:description", "rdf:Alt", new SemWeb.Literal (data.XmpObject, "x-default", null));
break;
case DataSetID.ObjectName:
MetadataStore.AddLiteral (sink, "dc:title", "rdf:Alt", new SemWeb.Literal (data.XmpObject, "x-default", null));
break;
case DataSetID.Keywords:
if (keywords == null) {
keywords = new BNode ();
sink.Add (new Statement (MetadataStore.FSpotXMPBase,
MetadataStore.Namespaces.Resolve ("dc:subject"),
keywords));
sink.Add (new Statement (keywords,
(Entity)MetadataStore.Namespaces.Resolve ("rdf:type"),
(Entity)MetadataStore.Namespaces.Resolve ("rdf:Bag")));
}
sink.Add (new Statement (keywords,
MetadataStore.Namespaces.Resolve ("rdf:li"),
new SemWeb.Literal (data.XmpObject, "x-default", null)));
break;
default:
if (data.XmpPredicate != null) {
sink.Add (new Statement (MetadataStore.FSpotXMPBase,
(Entity)data.XmpPredicate,
new SemWeb.Literal (data.XmpObject)));
}
break;
}
}
}
public void TestListWithZeroElements()
{
N3Writer instance = (N3Writer)CreateInstance();
BNode listId = new BNode();
instance.Add(new Statement(listId, Predicate.RdfType, (Entity)"List"));
instance.Add(new Statement(listId, Predicate.RdfFirst, Identifier.RdfNil));
instance.Add(new Statement(listId, Predicate.RdfRest, Identifier.RdfNil));
instance.Close();
string expected = "() a <List>.";
Assert.AreEqual(expected, writer.ToString());
}
/// <summary>
/// Writes the specified bNode to the output writer.
/// </summary>
/// <param name="bNode">The bNode.</param>
protected virtual void WriteBNode(BNode bNode)
{
Write("_:");
WriteEscaped(bNode.LocalName ?? ("bnode" + Math.Abs(bNode.GetHashCode())));
}
private Resource ResolveQName(string str, ParseContext context, Location loc) {
int colon = str.IndexOf(":");
string prefix = str.Substring(0, colon);
if (prefix == "_") {
Resource ret = (Resource)context.anonymous[str];
if (ret == null) {
ret = new BNode(str.Substring(colon+1));
context.anonymous[str] = ret;
}
return ret;
} else if (prefix == "" && context.namespaces.GetNamespace(prefix) == null) {
return GetResource(context, (BaseUri == null ? "#" : BaseUri) + str.Substring(colon+1));
} else {
string ns = context.namespaces.GetNamespace(prefix);
if (ns == null)
OnError("Prefix is undefined: " + str, loc);
if (prefix != "")
Namespaces.AddNamespace(ns, prefix);
return GetResource(context, ns + str.Substring(colon+1));
}
}
public void TestListWithThreeElementsWithLastUnbound()
{
N3Writer instance = (N3Writer)CreateInstance();
BNode listId = new BNode();
BNode listTwoId = new BNode();
BNode listThreeId = new BNode();
instance.Add(new Statement(listId, Predicate.RdfType, (Entity)"List"));
instance.Add(new Statement(listId, Predicate.RdfFirst, (Entity)"A"));
instance.Add(new Statement(listId, Predicate.RdfRest, listTwoId));
instance.Add(new Statement(listTwoId, Predicate.RdfFirst, (Entity)"B"));
instance.Add(new Statement(listTwoId, Predicate.RdfRest, listThreeId));
instance.Add(new Statement(listThreeId, Predicate.RdfFirst, (Entity)"C"));
instance.Close();
string expected = @"\(<A> <B> <C> _:bnode\d+\) a <List>.";
Assert.That(writer.ToString(), Text.Matches(expected));
}
public void TestListWithFormulaElements()
{
N3Writer instance = (N3Writer)CreateInstance();
BNode statementXId = new BNode();
BNode statementYId = new BNode();
BNode statementZId = new BNode();
instance.Add(new Statement("S", "p", (Entity)"X", statementXId));
instance.Add(new Statement("S", "p", (Entity)"Y", statementYId));
instance.Add(new Statement("S", "p", (Entity)"Z", statementZId));
BNode listId = new BNode();
BNode listTwoId = new BNode();
BNode listThreeId = new BNode();
instance.Add(new Statement(listId, Predicate.RdfType, (Entity)"List"));
instance.Add(new Statement(listId, Predicate.RdfFirst, statementXId));
instance.Add(new Statement(listId, Predicate.RdfRest, listTwoId));
instance.Add(new Statement(listTwoId, Predicate.RdfFirst, statementYId));
instance.Add(new Statement(listTwoId, Predicate.RdfRest, listThreeId));
instance.Add(new Statement(listThreeId, Predicate.RdfFirst, statementZId));
instance.Add(new Statement(listThreeId, Predicate.RdfRest, Identifier.RdfNil));
instance.Close();
string expected = "({<S> <p> <X>.}\n {<S> <p> <Y>.}\n {<S> <p> <Z>.}) a <List>.";
Assert.AreEqual(expected, writer.ToString());
}
private Entity ParseDescription() {
// The XmlReader is positioned on an element node
// that is a description of an entity.
// On returning, the reader is positioned after the
// end element of the description node.
string nodeID = xml.GetAttribute("nodeID", NS.RDF);
string about = xml.GetAttribute("about", NS.RDF);
string ID = xml.GetAttribute("ID", NS.RDF);
if (isset(nodeID) + isset(about) + isset(ID) > 1)
OnError("An entity description cannot specify more than one of rdf:nodeID, rdf:about, and rdf:ID");
if (nodeID != null && !IsValidXmlName(nodeID))
OnWarning("'" + nodeID + "' is not a valid XML Name");
if (ID != null && !IsValidXmlName(ID))
OnWarning("'" + ID + "' is not a valid XML Name");
Entity entity;
if (about != null)
entity = GetNamedNode(Unrelativize(about));
else if (ID != null) {
entity = GetNamedNode(Unrelativize("#" + ID));
if (seenIDs.ContainsKey(entity.Uri))
OnWarning("Two descriptions should not use the same rdf:ID: <" + entity.Uri + ">");
seenIDs[entity.Uri] = seenIDs;
} else if (nodeID != null)
entity = GetBlankNode(nodeID);
else
entity = new BNode();
// If the name of the element is not rdf:Description,
// then the name gives its type.
string curnode = CurNode();
if (curnode != NS.RDF + "Description") {
if (IsRestrictedName(curnode) || IsDeprecatedName(curnode))
OnError(xml.Name + " cannot be the type of a resource.");
if (curnode == NS.RDF + "li") OnError("rdf:li cannot be the type of a resource");
storage.Add(new Statement(entity, rdfType, (Entity)curnode, Meta));
}
ParsePropertyAttributes(entity);
ParsePropertyNodes(entity);
return entity;
}
public static void Main()
{
// Create the instance data
MemoryStore dataModel = new MemoryStore();
BNode paris = new BNode("paris");
BNode orleans = new BNode("orleans");
BNode chartres = new BNode("chartres");
BNode amiens = new BNode("amiens");
BNode blois = new BNode("blois");
BNode bourges = new BNode("bourges");
BNode tours = new BNode("tours");
BNode lemans = new BNode("lemans");
BNode angers = new BNode("angers");
BNode nantes = new BNode("nantes");
Entity oneway = new Entity("http://www.agfa.com/w3c/euler/graph.axiom#oneway");
Entity path = new Entity("http://www.agfa.com/w3c/euler/graph.axiom#path");
dataModel.Add(new Statement(paris, oneway, orleans));
dataModel.Add(new Statement(paris, oneway, chartres));
dataModel.Add(new Statement(paris, oneway, amiens));
dataModel.Add(new Statement(orleans, oneway, blois));
dataModel.Add(new Statement(orleans, oneway, bourges));
dataModel.Add(new Statement(blois, oneway, tours));
dataModel.Add(new Statement(chartres, oneway, lemans));
dataModel.Add(new Statement(lemans, oneway, angers));
dataModel.Add(new Statement(lemans, oneway, tours));
dataModel.Add(new Statement(angers, oneway, nantes));
// Create the inference rules by reading them from a N3 string.
string rules =
"@prefix : <http://www.agfa.com/w3c/euler/graph.axiom#>.\n" +
"\n" +
"{ ?a :oneway ?b } => { ?a :path ?b } .\n" +
"{ ?a :path ?b . ?b :path ?c . } => { ?a :path ?c } .\n";
// Create our question in the form of a statement to test.
Statement question = new Statement(paris, path, nantes);
// Create the Euler engine
Euler engine = new Euler(new N3Reader(new StringReader(rules)));
// First Method of Inference:
// Ask the engine whether there is a path from paris to nantes.
// The Prove method will return a list of proofs, or an empty
// array if it could not find a proof.
foreach (Proof p in engine.Prove(dataModel, new Statement[] { question })) {
Console.WriteLine(p.ToString());
}
// Second Method of Inference:
// Apply the engine to the data model and then use the data
// model's Contains method to see if the statement is "in"
// the model + reasoning.
dataModel.AddReasoner(engine);
Console.WriteLine("Euler Says the Question is: " + dataModel.Contains(question));
}
private void ParseProperty(Entity subject, ref int liIndex) {
// The reader is positioned on a propert node,
// and on returning the reader is positioned past
// that node.
// Get all of the attributes before we move the reader forward.
string nodeID = xml.GetAttribute("nodeID", NS.RDF);
string resource = xml.GetAttribute("resource", NS.RDF);
string parseType = xml.GetAttribute("parseType", NS.RDF);
string datatype = xml.GetAttribute("datatype", NS.RDF);
string lang = xml.XmlLang != "" ? xml.XmlLang : null;
string predicate = CurNode();
if (predicate == NS.RDF + "li")
predicate = NS.RDF + "_" + (liIndex++);
if (IsRestrictedName(predicate))
OnError(xml.Name + " cannot be used as a property name.");
if (IsDeprecatedName(predicate))
OnError(xml.Name + " has been deprecated and cannot be used as a property name.");
string ID = xml.GetAttribute("ID", NS.RDF);
if (nodeID != null && !IsValidXmlName(nodeID))
OnWarning("'" + nodeID + "' is not a valid XML Name");
if (ID != null && !IsValidXmlName(ID))
OnWarning("'" + ID + "' is not a valid XML Name");
Resource objct = null;
if (nodeID != null || resource != null) {
if (isset(nodeID) + isset(resource) > 1)
OnError("A predicate node cannot specify more than one of rdf:nodeID and rdf:resource");
if (parseType != null || datatype != null)
OnError("The attributes rdf:parseType and rdf:datatype are not valid on a predicate with a rdf:nodeID or rdf:resource attribute");
// Object is an entity given by nodeID or resource.
if (nodeID != null)
objct = GetBlankNode(nodeID);
else if (resource != null)
objct = GetNamedNode(Unrelativize(resource));
ParsePropertyAttributes((Entity)objct);
// No children are allowed in this element.
if (!xml.IsEmptyElement)
while (xml.Read()) {
if (xml.NodeType == XmlNodeType.EndElement) break;
if (xml.NodeType == XmlNodeType.Whitespace) continue;
if (xml.NodeType == XmlNodeType.Comment) continue;
if (xml.NodeType == XmlNodeType.ProcessingInstruction) continue;
OnError("Content is not allowed within a property with a rdf:nodeID or rdf:resource attribute");
}
} else if (parseType != null && parseType == "Literal") {
if (datatype != null)
OnError("The attribute rdf:datatype is not valid on a predicate whose parseType is Literal.");
datatype = "http://www.w3.org/1999/02/22-rdf-syntax-ns#XMLLiteral";
if (ParsePropertyAttributes(new BNode()))
OnError("Property attributes are not valid when parseType is Literal");
// TODO: Do we canonicalize according to:
// http://www.w3.org/TR/2002/REC-xml-exc-c14n-20020718/ ?
objct = new Literal(xml.ReadInnerXml(), null, datatype);
} else if (parseType != null && parseType == "Resource") {
objct = new BNode();
ParsePropertyAttributes((Entity)objct);
if (!xml.IsEmptyElement)
ParsePropertyNodes((Entity)objct);
} else if (parseType != null && parseType == "Collection") {
Entity collection = new BNode();
Entity lastnode = collection;
bool empty = true;
ParsePropertyAttributes(collection);
if (!xml.IsEmptyElement)
while (xml.Read()) {
if (xml.NodeType == XmlNodeType.EndElement) break;
if (xml.NodeType != XmlNodeType.Element) continue;
if (!empty) {
Entity next = new BNode();
storage.Add(new Statement(lastnode, rdfRest, next, Meta));
lastnode = next;
}
Entity item = ParseDescription();
storage.Add(new Statement(lastnode, rdfFirst, item, Meta));
empty = false;
}
storage.Add(new Statement(lastnode, rdfRest, rdfNil, Meta));
if (empty)
objct = rdfNil;
else
objct = collection;
} else if (parseType != null) {
OnError("Invalid value for parseType: '" + parseType + "'");
} else if (datatype != null) {
// Note that any xml:lang is discarded.
if (ParsePropertyAttributes(new BNode()))
OnError("Property attributes are not valid when a datatype is given");
if (xml.IsEmptyElement) {
objct = new Literal("", null, datatype);
} else {
#if !DOTNET2
objct = new Literal(xml.ReadString(), null, datatype);
#else
objct = new Literal(xml.ReadElementContentAsString(), null, datatype);
#endif
if (xml.NodeType != XmlNodeType.EndElement)
OnError("XML markup may not appear in a datatyped literal property.");
}
} else {
// We don't know whether the contents of this element
// refer to a literal or an entity. If an element is
// a child of this node, then it must be an entity.
// If the property has predicate attributes, then it
// is an anonymous entity. Otherwise the text content
// is the literal value.
objct = new BNode();
if (ParsePropertyAttributes((Entity)objct)) {
// Found property attributes. There should be no other internal content?
if (!xml.IsEmptyElement)
while (xml.Read()) {
if (xml.NodeType == XmlNodeType.EndElement) break;
if (xml.NodeType == XmlNodeType.Whitespace) continue;
if (xml.NodeType == XmlNodeType.Comment) continue;
if (xml.NodeType == XmlNodeType.ProcessingInstruction) continue;
OnError(xml.NodeType + " is not allowed within a property with property attributes");
}
} else {
StringBuilder textcontent = new StringBuilder();
bool hadText = false;
bool hadElement = false;
if (!xml.IsEmptyElement)
while (xml.Read()) {
if (xml.NodeType == XmlNodeType.EndElement) break;
if (xml.NodeType == XmlNodeType.Element) {
if (hadText)
OnError("Both text and elements are present as a property value");
if (hadElement)
OnError("A property node cannot contain more than one entity description. " + objct + " already found.");
hadElement = true;
objct = ParseDescription();
} else if (xml.NodeType == XmlNodeType.Text || xml.NodeType == XmlNodeType.SignificantWhitespace) {
if (hadElement)
OnError("Both text and elements are present as a property value");
textcontent.Append(xml.Value);
hadText = true;
} else {
textcontent.Append(xml.Value);
}
}
if (!hadElement)
objct = new Literal(textcontent.ToString(), lang, null);
}
}
storage.Add(new Statement(subject, predicate, objct, Meta));
if (ID != null) {
// In addition to adding the statement as normal, also
// add a reified statement.
Entity statement = GetNamedNode(Unrelativize("#" + ID));;
storage.Add(new Statement(statement, rdfType, rdfStatement, Meta));
storage.Add(new Statement(statement, rdfSubject, subject, Meta));
storage.Add(new Statement(statement, rdfPredicate, (Entity)predicate, Meta));
storage.Add(new Statement(statement, rdfObject, objct, Meta));
}
}
/// <summary>
/// Writes the specified bNode to the output writer.
/// </summary>
/// <param name="bNode">The bNode.</param>
protected virtual void WriteBNode(BNode bNode)
{
Write("_:");
WriteEscaped(bNode.LocalName ?? ("bnode" + Math.Abs(bNode.GetHashCode())));
}
public Entity ToEntity(name.levering.ryan.sparql.common.Value ent)
{
if (ent == null) return null;
if (ent is BNodeWrapper) return ((BNodeWrapper)ent).r;
if (ent is URIWrapper) return ((URIWrapper)ent).r;
if (ent is name.levering.ryan.sparql.common.BNode) {
name.levering.ryan.sparql.common.BNode bnode = (name.levering.ryan.sparql.common.BNode)ent;
Entity r = (Entity)bnodes[bnode.getID()];
if (r == null) {
r = new BNode();
bnodes[bnode.getID()] = r;
}
return r;
} else if (ent is name.levering.ryan.sparql.common.URI) {
name.levering.ryan.sparql.common.URI uri = (name.levering.ryan.sparql.common.URI)ent;
return new Entity(uri.getURI());
} else {
return null;
}
}
void CanForgetBNodes.ForgetBNode(BNode bnode)
{
anonNames.Remove(bnode);
anonNameMap.Remove(bnode);
}
/// <summary>
/// Writes the specified bNode to the output writer.
/// </summary>
/// <param name="bNode">The bNode.</param>
protected override void WriteBNode(BNode bNode)
{
if (bNode is Variable)
WriteVariable((Variable)bNode);
else
base.WriteBNode(bNode);
}
private void ParseProperty(Entity subject, ref int liIndex)
{
// The reader is positioned on a propert node,
// and on returning the reader is positioned past
// that node.
// Get all of the attributes before we move the reader forward.
string nodeID = xml.GetAttribute("nodeID", NS.RDF);
string resource = xml.GetAttribute("resource", NS.RDF);
string parseType = xml.GetAttribute("parseType", NS.RDF);
string datatype = xml.GetAttribute("datatype", NS.RDF);
string lang = xml.XmlLang != "" ? xml.XmlLang : null;
string predicate = CurNode();
if (predicate == NS.RDF + "li")
{
predicate = NS.RDF + "_" + (liIndex++);
}
if (IsRestrictedName(predicate))
{
OnError(xml.Name + " cannot be used as a property name");
}
if (IsDeprecatedName(predicate))
{
OnError(xml.Name + " has been deprecated and cannot be used as a property name");
}
string ID = xml.GetAttribute("ID", NS.RDF);
if (nodeID != null && !IsValidXmlName(nodeID))
{
OnWarning("'" + nodeID + "' is not a valid XML Name");
}
if (ID != null && !IsValidXmlName(ID))
{
OnWarning("'" + ID + "' is not a valid XML Name");
}
Resource objct = null;
if (nodeID != null || resource != null)
{
if (isset(nodeID) + isset(resource) > 1)
{
OnError("A predicate node cannot specify more than one of rdf:nodeID and rdf:resource");
}
if (parseType != null || datatype != null)
{
OnError("The attributes rdf:parseType and rdf:datatype are not valid on a predicate with a rdf:nodeID or rdf:resource attribute");
}
// Object is an entity given by nodeID or resource.
if (nodeID != null)
{
objct = GetBlankNode(nodeID);
}
else if (resource != null)
{
objct = GetNamedNode(Unrelativize(resource));
}
ParsePropertyAttributes((Entity)objct);
// No children are allowed in this element.
if (!xml.IsEmptyElement)
{
while (xml.Read())
{
if (xml.NodeType == XmlNodeType.EndElement)
{
break;
}
if (xml.NodeType == XmlNodeType.Whitespace)
{
continue;
}
if (xml.NodeType == XmlNodeType.Comment)
{
continue;
}
if (xml.NodeType == XmlNodeType.ProcessingInstruction)
{
continue;
}
OnError("Content is not allowed within a property with a rdf:nodeID or rdf:resource attribute");
}
}
}
else if (parseType != null && parseType == "Literal")
{
if (datatype != null)
{
OnError("The attribute rdf:datatype is not valid on a predicate whose parseType is Literal");
}
datatype = "http://www.w3.org/1999/02/22-rdf-syntax-ns#XMLLiteral";
if (ParsePropertyAttributes(new BNode()))
{
OnError("Property attributes are not valid when parseType is Literal");
}
// TODO: Do we canonicalize according to:
// http://www.w3.org/TR/2002/REC-xml-exc-c14n-20020718/ ?
objct = new Literal(xml.ReadInnerXml(), null, datatype);
ValidateLiteral((Literal)objct);
}
else if (parseType != null && parseType == "Resource")
{
objct = new BNode();
ParsePropertyAttributes((Entity)objct);
if (!xml.IsEmptyElement)
{
ParsePropertyNodes((Entity)objct);
}
}
else if (parseType != null && parseType == "Collection")
{
Entity collection = new BNode();
Entity lastnode = collection;
bool empty = true;
ParsePropertyAttributes(collection);
if (!xml.IsEmptyElement)
{
while (xml.Read())
{
if (xml.NodeType == XmlNodeType.EndElement)
{
break;
}
if (xml.NodeType != XmlNodeType.Element)
{
continue;
}
if (!empty)
{
Entity next = new BNode();
storage.Add(new Statement(lastnode, rdfRest, next, Meta));
lastnode = next;
}
Entity item = ParseDescription();
storage.Add(new Statement(lastnode, rdfFirst, item, Meta));
empty = false;
}
}
storage.Add(new Statement(lastnode, rdfRest, rdfNil, Meta));
if (empty)
{
objct = rdfNil;
}
else
{
objct = collection;
}
}
else if (parseType != null)
{
OnError("Invalid value for parseType: '" + parseType + "'");
}
else if (datatype != null)
{
// Note that any xml:lang is discarded.
if (ParsePropertyAttributes(new BNode()))
{
OnError("Property attributes are not valid when a datatype is given");
}
if (xml.IsEmptyElement)
{
objct = new Literal("", null, datatype);
ValidateLiteral((Literal)objct);
}
else
{
#if !DOTNET2
objct = new Literal(xml.ReadString(), null, datatype);
if (xml.NodeType != XmlNodeType.EndElement)
{
OnError("XML markup may not appear in a datatyped literal property");
}
#else
try {
objct = new Literal(xml.ReadElementContentAsString(), null, datatype);
} catch (XmlException) {
OnError("XML markup may not appear in a datatyped literal property");
}
#endif
ValidateLiteral((Literal)objct);
}
}
else
{
// We don't know whether the contents of this element
// refer to a literal or an entity. If an element is
// a child of this node, then it must be an entity.
// If the property has predicate attributes, then it
// is an anonymous entity. Otherwise the text content
// is the literal value.
objct = new BNode();
if (ParsePropertyAttributes((Entity)objct))
{
// Found property attributes. There should be no other internal content?
if (!xml.IsEmptyElement)
{
while (xml.Read())
{
if (xml.NodeType == XmlNodeType.EndElement)
{
break;
}
if (xml.NodeType == XmlNodeType.Whitespace)
{
continue;
}
if (xml.NodeType == XmlNodeType.Comment)
{
continue;
}
if (xml.NodeType == XmlNodeType.ProcessingInstruction)
{
continue;
}
OnError(xml.NodeType + " is not allowed within a property with property attributes");
}
}
}
else
{
StringBuilder textcontent = new StringBuilder();
bool hadText = false;
bool hadElement = false;
if (!xml.IsEmptyElement)
{
while (xml.Read())
{
if (xml.NodeType == XmlNodeType.EndElement)
{
break;
}
if (xml.NodeType == XmlNodeType.Element)
{
if (hadText)
{
OnError("Both text and elements are present as a property value");
}
if (hadElement)
{
OnError("A property node cannot contain more than one entity description. " + objct + " already found");
}
hadElement = true;
objct = ParseDescription();
}
else if (xml.NodeType == XmlNodeType.Text || xml.NodeType == XmlNodeType.SignificantWhitespace)
{
if (hadElement)
{
OnError("Both text and elements are present as a property value");
}
textcontent.Append(xml.Value);
hadText = true;
}
else
{
textcontent.Append(xml.Value);
}
}
}
if (!hadElement)
{
objct = new Literal(textcontent.ToString(), lang, null);
}
}
}
storage.Add(new Statement(subject, predicate, objct, Meta));
if (ID != null)
{
// In addition to adding the statement as normal, also
// add a reified statement.
Entity statement = GetNamedNode(Unrelativize("#" + ID));;
storage.Add(new Statement(statement, rdfType, rdfStatement, Meta));
storage.Add(new Statement(statement, rdfSubject, subject, Meta));
storage.Add(new Statement(statement, rdfPredicate, (Entity)predicate, Meta));
storage.Add(new Statement(statement, rdfObject, objct, Meta));
}
}
private string GetBNodeRef(BNode node)
{
if (node.LocalName != null &&
(nameAlloc[node.LocalName] == null || (BNode)nameAlloc[node.LocalName] == node)
&& !node.LocalName.StartsWith("bnode")) {
nameAlloc[node.LocalName] = node; // ensure two different nodes with the same local name don't clash
return node.LocalName;
} else if (anonAlloc[node] != null) {
return (string)anonAlloc[node];
} else {
string id = "bnode" + (anonCounter++);
anonAlloc[node] = id;
return id;
}
}
public Entity ToEntity(org.openrdf.model.Value ent) {
if (ent == null) return null;
if (ent is BNodeWrapper) return ((BNodeWrapper)ent).r;
if (ent is URIWrapper) return ((URIWrapper)ent).r;
if (ent is org.openrdf.model.BNode) {
org.openrdf.model.BNode bnode = (org.openrdf.model.BNode)ent;
Entity r = (Entity)bnodes[bnode.getID()];
if (r == null) {
r = new BNode();
bnodes[bnode.getID()] = r;
}
return r;
} else if (ent is org.openrdf.model.URI) {
org.openrdf.model.URI uri = (org.openrdf.model.URI)ent;
return new Entity(uri.toString());
} else {
return null;
}
}
public static void Add (StatementSink sink, Entity subject, string predicate, string type, string [] values)
{
if (values == null) {
System.Console.WriteLine ("{0} has no values; skipping", predicate);
return;
}
Entity empty = new SemWeb.BNode();
Statement top = new Statement (subject, (Entity)MetadataStore.Namespaces.Resolve (predicate), empty);
Statement desc = new Statement (empty,
(Entity)MetadataStore.Namespaces.Resolve ("rdf:type"),
(Entity)MetadataStore.Namespaces.Resolve (type));
sink.Add (desc);
foreach (string value in values) {
Statement literal = new Statement (empty,
(Entity)MetadataStore.Namespaces.Resolve ("rdf:li"),
new SemWeb.Literal (value, null, null));
sink.Add (literal);
}
sink.Add (top);
}
private Resource ReadResource2(ParseContext context, bool allowDirective, out bool reverse, out bool forgetBNode) {
reverse = false;
forgetBNode = false;
Location loc = context.Location;
object tok = ReadToken(context.source, context);
if (tok is Literal)
return (Literal)tok;
string str = (string)tok;
if (str == "")
return null;
// Directives
if (str == "@prefix") {
if (allowDirective)
return PrefixResource;
else
OnError("The directive '" + str + "' is not allowed here", loc);
}
if (str == "@keywords") {
if (allowDirective)
return KeywordsResource;
else
OnError("The directive '" + str + "' is not allowed here", loc);
}
if (str == "@base") {
if (allowDirective)
return BaseResource;
else
OnError("The directive '" + str + "' is not allowed here", loc);
}
// @ Keywords
if (context.UsingKeywords && context.Keywords.Contains(str))
str = "@" + str;
if (!context.UsingKeywords &&
( str == "a" || str == "has" || str == "is"))
str = "@" + str;
// Standard Keywords
// TODO: Turn these off with @keywords
if (str == "@a")
return entRDFTYPE;
if (str == "=")
return entDAMLEQUIV;
if (str == "=>")
return entLOGIMPLIES;
if (str == "<=") {
reverse = true;
return entLOGIMPLIES;
}
if (str == "=:>") // SPECIAL EXTENSION!
return entGRAPHCONTAINS;
if (str == "@has") // ignore this token
return ReadResource2(context, false, out reverse, out forgetBNode);
if (str == "@is") {
// Reverse predicate
bool reversetemp;
Resource pred = ReadResource2(context, false, out reversetemp, out forgetBNode);
reverse = true;
string of = ReadToken(context.source, context) as string;
if (of == null) OnError("End of stream while expecting 'of'", loc);
if (of == "@of"
|| (!context.UsingKeywords && of == "of")
|| (context.UsingKeywords && context.Keywords.Contains("of") && of == "of"))
return pred;
OnError("Expecting token 'of' but found '" + of + "'", loc);
return null; // unreachable
}
if (str.StartsWith("@"))
OnError("The " + str + " directive is not supported", loc);
// URI
if (str.StartsWith("<") && str.EndsWith(">")) {
string uri = GetAbsoluteUri(BaseUri, str.Substring(1, str.Length-2));
string urierror = Entity.ValidateUri(uri);
if (urierror != null)
OnWarning(urierror, loc);
return GetResource(context, uri);
}
// VARIABLE
if (str[0] == '?') {
string name = str.Substring(1);
Entity varb = (Entity)context.variables[name];
if (varb == null) {
varb = new Variable(name);
AddVariable((Variable)varb);
context.variables[name] = varb;
}
return varb;
}
// QNAME
if (str.IndexOf(":") != -1)
return ResolveQName(str, context, loc);
// ANONYMOUS
if (str == "[") {
Entity ret = new BNode();
ReadWhitespace(context.source);
if (context.source.Peek() != ']') {
char bracket = ReadPredicates(ret, context);
if (bracket == '.')
bracket = ReadPunc(context.source);
if (bracket != ']')
OnError("Expected a close bracket but found '" + bracket + "'", loc);
} else {
context.source.Read();
}
forgetBNode = true;
return ret;
}
// LIST
if (str == "(") {
// A list
Entity head = null, ent = null;
while (true) {
bool rev2, fb2;
Resource res = ReadResource(context, false, out rev2, out fb2);
if (res == null)
break;
if (ent == null) {
ent = new BNode();
head = ent;
} else {
Entity sub = new BNode();
Add(context.store, new Statement(ent, entRDFREST, sub, context.meta), loc);
ent = sub;
}
Add(context.store, new Statement(ent, entRDFFIRST, res, context.meta), loc);
if (fb2) DoForget(res, context);
}
if (head == null) // No list items.
head = entRDFNIL; // according to Turtle spec
else
Add(context.store, new Statement(ent, entRDFREST, entRDFNIL, context.meta), loc);
return head;
}
if (str == ")")
return null; // Should I use a more precise end-of-list return value?
// FORMULA
if (str == "{") {
// ParseContext is a struct, so this gives us a clone.
ParseContext newcontext = context;
// The formula is denoted by a blank node, unless we set
// the override meta flag above.
if (context.overrideMeta == null)
newcontext.meta = new BNode();
else
newcontext.meta = context.overrideMeta;
// According to the spec, _:xxx anonymous nodes are
// local to the formula. But ?$variables (which aren't
// mentioned in the spec) are treated as global names.
newcontext.anonymous = new Hashtable();
while (NextPunc(context.source) != '}' && ReadStatement(newcontext)) { }
ReadWhitespace(context.source);
if (context.source.Peek() == '}') context.source.Read();
return newcontext.meta;
}
// NUMERIC LITERAL
// In Turtle, numbers are restricted to [0-9]+, and are datatyped xsd:integer.
double numval;
#if !SILVERLIGHT
if (double.TryParse(str, System.Globalization.NumberStyles.Any, null, out numval)) {
#else
bool ok = true;
numval = 0;
try {
numval = double.Parse(str);
} catch (Exception) {
ok = false;
}
if (ok) {
#endif
if (numval >= long.MinValue && numval <= long.MaxValue && numval == (double)(long)numval)
return new Literal(((long)numval).ToString(), null, NS.XMLSCHEMA + "integer");
else
return new Literal(numval.ToString(), null, NS.XMLSCHEMA + "double");
}
//BOOLEAN LITERAL
if (str == "true" || str == "false") {
return new Literal(str,null,NS.XMLSCHEMA+"boolean");
}
// If @keywords is used, alphanumerics that aren't keywords
// are local names in the default namespace.
if (context.UsingKeywords && char.IsLetter(str[0])) {
if (BaseUri == null)
OnError("The document contains an unqualified name but no BaseUri was specified: \"" + str + "\"", loc);
return GetResource(context, BaseUri + str);
}
// NOTHING MATCHED
OnError("Invalid token: " + str, loc);
return null;
}
private void Add(StatementSink store, Statement statement, Location position) {
store.Add(statement);
}
public void TestFormulaWithList()
{
N3Writer instance = (N3Writer)CreateInstance();
BNode listId = new BNode();
BNode listTwoId = new BNode();
BNode listThreeId = new BNode();
instance.Add(new Statement(listId, Predicate.RdfFirst, (Entity)"A"));
instance.Add(new Statement(listId, Predicate.RdfRest, listTwoId));
instance.Add(new Statement(listTwoId, Predicate.RdfFirst, (Entity)"B"));
instance.Add(new Statement(listTwoId, Predicate.RdfRest, listThreeId));
instance.Add(new Statement(listThreeId, Predicate.RdfFirst, (Entity)"C"));
instance.Add(new Statement(listThreeId, Predicate.RdfRest, Identifier.RdfNil));
BNode statementXId = new BNode();
BNode statementYId = new BNode();
instance.Add(new Statement(listId, "p", (Entity)"X", statementXId));
instance.Add(new Statement(listId, "p", (Entity)"Y", statementYId));
instance.Add(new Statement(statementXId, Predicate.LogImplies, statementYId));
instance.Close();
string expected = "{(<A> <B> <C>) <p> <X>.} => {(<A> <B> <C>) <p> <Y>.}.";
Assert.AreEqual(expected, writer.ToString());
}
private Entity ParseDescription()
{
// The XmlReader is positioned on an element node
// that is a description of an entity.
// On returning, the reader is positioned after the
// end element of the description node.
string nodeID = xml.GetAttribute("nodeID", NS.RDF);
string about = xml.GetAttribute("about", NS.RDF);
string ID = xml.GetAttribute("ID", NS.RDF);
if (isset(nodeID) + isset(about) + isset(ID) > 1)
{
OnError("An entity description cannot specify more than one of rdf:nodeID, rdf:about, and rdf:ID");
}
if (nodeID != null && !IsValidXmlName(nodeID))
{
OnWarning("'" + nodeID + "' is not a valid XML Name");
}
if (ID != null && !IsValidXmlName(ID))
{
OnWarning("'" + ID + "' is not a valid XML Name");
}
Entity entity;
if (about != null)
{
entity = GetNamedNode(Unrelativize(about));
}
else if (ID != null)
{
entity = GetNamedNode(Unrelativize("#" + ID));
if (seenIDs.ContainsKey(entity.Uri))
{
OnWarning("Two descriptions should not use the same rdf:ID: <" + entity.Uri + ">");
}
seenIDs[entity.Uri] = seenIDs;
}
else if (nodeID != null)
{
entity = GetBlankNode(nodeID);
}
else
{
entity = new BNode();
}
// If the name of the element is not rdf:Description,
// then the name gives its type.
string curnode = CurNode();
if (curnode != NS.RDF + "Description")
{
if (IsRestrictedName(curnode) || IsDeprecatedName(curnode))
{
OnError(xml.Name + " cannot be the type of a resource");
}
if (curnode == NS.RDF + "li")
{
OnError("rdf:li cannot be the type of a resource");
}
storage.Add(new Statement(entity, rdfType, (Entity)curnode, Meta));
}
ParsePropertyAttributes(entity);
ParsePropertyNodes(entity);
return(entity);
}
/// <summary>
/// Adds the statement of a formula.
/// </summary>
/// <param name="statement">The statement.</param>
protected virtual void AddFormulaStatement(Statement statement)
{
Entity formulaId = statement.Meta;
Entity statementId = new BNode();
if (m_LastFormulaId != formulaId)
{
m_LastFormulaId = formulaId;
AddStatement(new Statement(formulaId, Predicate.RdfType, Identifier.LogFormula));
}
AddStatement(new Statement(formulaId, Predicate.LogIncludes, statementId));
AddStatement(new Statement(statementId, Predicate.RdfType, Identifier.RdfStatement));
AddStatement(new Statement(statementId, Predicate.RdfSubject, statement.Subject));
AddStatement(new Statement(statementId, Predicate.RdfPredicate, statement.Predicate));
AddStatement(new Statement(statementId, Predicate.RdfObject, statement.Object));
}
private Resource ReadResource2(ParseContext context, bool allowDirective, out bool reverse, out bool forgetBNode)
{
reverse = false;
forgetBNode = false;
Location loc = context.Location;
object tok = ReadToken(context.source, context);
if (tok is Literal)
{
return((Literal)tok);
}
string str = (string)tok;
if (str == "")
{
return(null);
}
// Directives
if (str == "@prefix")
{
if (allowDirective)
{
return(PrefixResource);
}
else
{
OnError("The directive '" + str + "' is not allowed here", loc);
}
}
if (str == "@keywords")
{
if (allowDirective)
{
return(KeywordsResource);
}
else
{
OnError("The directive '" + str + "' is not allowed here", loc);
}
}
if (str == "@base")
{
if (allowDirective)
{
return(BaseResource);
}
else
{
OnError("The directive '" + str + "' is not allowed here", loc);
}
}
// @ Keywords
if (context.UsingKeywords && context.Keywords.Contains(str))
{
str = "@" + str;
}
if (!context.UsingKeywords &&
(str == "a" || str == "has" || str == "is"))
{
str = "@" + str;
}
// Standard Keywords
// TODO: Turn these off with @keywords
if (str == "@a")
{
return(entRDFTYPE);
}
if (str == "=")
{
return(entDAMLEQUIV);
}
if (str == "=>")
{
return(entLOGIMPLIES);
}
if (str == "<=")
{
reverse = true;
return(entLOGIMPLIES);
}
if (str == "=:>") // SPECIAL EXTENSION!
{
return(entGRAPHCONTAINS);
}
if (str == "@has") // ignore this token
{
return(ReadResource2(context, false, out reverse, out forgetBNode));
}
if (str == "@is")
{
// Reverse predicate
bool reversetemp;
Resource pred = ReadResource2(context, false, out reversetemp, out forgetBNode);
reverse = true;
string of = ReadToken(context.source, context) as string;
if (of == null)
{
OnError("End of stream while expecting 'of'", loc);
}
if (of == "@of" ||
(!context.UsingKeywords && of == "of") ||
(context.UsingKeywords && context.Keywords.Contains("of") && of == "of"))
{
return(pred);
}
OnError("Expecting token 'of' but found '" + of + "'", loc);
return(null); // unreachable
}
if (str.StartsWith("@"))
{
OnError("The " + str + " directive is not supported", loc);
}
// URI
if (str.StartsWith("<") && str.EndsWith(">"))
{
string uri = GetAbsoluteUri(BaseUri, str.Substring(1, str.Length - 2));
string urierror = Entity.ValidateUri(uri);
if (urierror != null)
{
OnWarning(urierror, loc);
}
return(GetResource(context, uri));
}
// VARIABLE
if (str[0] == '?')
{
string name = str.Substring(1);
Entity varb = (Entity)context.variables[name];
if (varb == null)
{
varb = new Variable(name);
AddVariable((Variable)varb);
context.variables[name] = varb;
}
return(varb);
}
// QNAME
if (str.IndexOf(":") != -1)
{
return(ResolveQName(str, context, loc));
}
// ANONYMOUS
if (str == "[")
{
Entity ret = new BNode();
ReadWhitespace(context.source);
if (context.source.Peek() != ']')
{
char bracket = ReadPredicates(ret, context);
if (bracket == '.')
{
bracket = ReadPunc(context.source);
}
if (bracket != ']')
{
OnError("Expected a close bracket but found '" + bracket + "'", loc);
}
}
else
{
context.source.Read();
}
forgetBNode = true;
return(ret);
}
// LIST
if (str == "(")
{
// A list
Entity head = null, ent = null;
while (true)
{
bool rev2, fb2;
Resource res = ReadResource(context, false, out rev2, out fb2);
if (res == null)
{
break;
}
if (ent == null)
{
ent = new BNode();
head = ent;
}
else
{
Entity sub = new BNode();
Add(context.store, new Statement(ent, entRDFREST, sub, context.meta), loc);
ent = sub;
}
Add(context.store, new Statement(ent, entRDFFIRST, res, context.meta), loc);
if (fb2)
{
DoForget(res, context);
}
}
if (head == null) // No list items.
{
head = entRDFNIL; // according to Turtle spec
}
else
{
Add(context.store, new Statement(ent, entRDFREST, entRDFNIL, context.meta), loc);
}
return(head);
}
if (str == ")")
{
return(null); // Should I use a more precise end-of-list return value?
}
// FORMULA
if (str == "{")
{
// ParseContext is a struct, so this gives us a clone.
ParseContext newcontext = context;
// The formula is denoted by a blank node, unless we set
// the override meta flag above.
if (context.overrideMeta == null)
{
newcontext.meta = new BNode();
}
else
{
newcontext.meta = context.overrideMeta;
}
// According to the spec, _:xxx anonymous nodes are
// local to the formula. But ?$variables (which aren't
// mentioned in the spec) are treated as global names.
newcontext.anonymous = new Hashtable();
while (NextPunc(context.source) != '}' && ReadStatement(newcontext))
{
}
ReadWhitespace(context.source);
if (context.source.Peek() == '}')
{
context.source.Read();
}
return(newcontext.meta);
}
// NUMERIC LITERAL
// In Turtle, numbers are restricted to [0-9]+, and are datatyped xsd:integer.
double numval;
#if !SILVERLIGHT
if (double.TryParse(str, System.Globalization.NumberStyles.Any, null, out numval))
{
#else
bool ok = true;
numval = 0;
try {
numval = double.Parse(str);
}
catch (Exception) {
ok = false;
}
if (ok)
{
#endif
if (numval >= long.MinValue && numval <= long.MaxValue && numval == (double)(long)numval)
{
return(new Literal(((long)numval).ToString(), null, NS.XMLSCHEMA + "integer"));
}
else
{
return(new Literal(numval.ToString(), null, NS.XMLSCHEMA + "double"));
}
}
//BOOLEAN LITERAL
if (str == "true" || str == "false")
{
return(new Literal(str, null, NS.XMLSCHEMA + "boolean"));
}
// If @keywords is used, alphanumerics that aren't keywords
// are local names in the default namespace.
if (context.UsingKeywords && char.IsLetter(str[0]))
{
if (BaseUri == null)
{
OnError("The document contains an unqualified name but no BaseUri was specified: \"" + str + "\"", loc);
}
return(GetResource(context, BaseUri + str));
}
// NOTHING MATCHED
OnError("Invalid token: " + str, loc);
return(null);
}
