public void Handle(QueryParser parser, QueryTokenizer tokenizer, Query query)
{
if (tokenizer.Type == QueryTokenizer.TokenType.StatementTerminator)
{
if (CurrentTermGroup.stackCount > 2)
{
ReportPattern(query);
SucceedingPatternTermsAreNotRequired();
}
}
else if (tokenizer.Type == QueryTokenizer.TokenType.ValueDelimiter)
{
ReportPatternRetainSubjectAndPredicate(query);
SucceedingPatternTermsAreNotRequired();
}
else if (tokenizer.Type == QueryTokenizer.TokenType.PredicateDelimiter)
{
ReportPatternRetainSubject(query);
SucceedingPatternTermsAreNotRequired();
}
else if (tokenizer.Type == QueryTokenizer.TokenType.LiteralLanguage)
{
PatternTerm member = CurrentTermGroup.popGraphMember();
CurrentTermGroup.pushGraphMember(new PlainLiteral(member.GetLabel(), tokenizer.TokenText));
}
else if (tokenizer.Type == QueryTokenizer.TokenType.LiteralDatatype)
{
PatternTerm member = CurrentTermGroup.popGraphMember();
CurrentTermGroup.pushGraphMember(new TypedLiteral(member.GetLabel(), tokenizer.TokenText));
}
else if (tokenizer.Type == QueryTokenizer.TokenType.KeywordFilter)
{
EndTermGroup(query);
ParseFilter(tokenizer, PatternGroup);
StartTermGroup( );
}
else if (tokenizer.Type == QueryTokenizer.TokenType.BeginGeneratedBlankNode)
{
BlankNode node = new BlankNode();
CurrentTermGroup.pushGraphMember(node);
StartBlankNodeGroup();
CurrentTermGroup.pushGraphMember(node);
}
else if (tokenizer.Type == QueryTokenizer.TokenType.EndGeneratedBlankNode)
{
EndTermGroup(query);
}
else
{
PatternTerm subjectMember = parser.ParseTokenToMember(query);
CurrentTermGroup.pushGraphMember(subjectMember);
SucceedingPatternTermsAreRequired();
}
}
public override State Handle(QueryParser parser, QueryTokenizer tokenizer, Query query)
{
if (Explain)
{
Console.WriteLine("Entering PREFIXES state");
}
do
{
if (Explain)
{
Console.WriteLine(" tokenizer.TokenText is " + tokenizer.TokenText + " (" + tokenizer.Type + ")");
}
switch (tokenizer.Type)
{
case QueryTokenizer.TokenType.PrefixName:
string prefix = tokenizer.TokenText;
if (tokenizer.MoveNext())
{
if (tokenizer.Type == QueryTokenizer.TokenType.QuotedIRIRef)
{
parser.RegisterPrefix(prefix, tokenizer.TokenText);
}
else
{
throw new SparqlException("Error parsing prefix declaration '" + prefix + "' at character " + tokenizer.TokenAbsolutePosition + ". The value of this prefix should be an IRI, but parser found '" + tokenizer.TokenText + "' instead");
}
}
else
{
throw new SparqlException("Error parsing prefix declaration '" + prefix + "' at character " + tokenizer.TokenAbsolutePosition + ". The query appears to be truncated after this declaration - no further content was found.");
}
break;
case QueryTokenizer.TokenType.KeywordSelect:
query.ResultForm = Query.ResultFormType.Select;
return(new SelectState());
case QueryTokenizer.TokenType.KeywordConstruct:
query.ResultForm = Query.ResultFormType.Construct;
return(new ConstructState());
case QueryTokenizer.TokenType.Comment:
break;
case QueryTokenizer.TokenType.KeywordPrefix:
break;
default:
throw new SparqlException("Expecting a prefix declaration. Got '" + tokenizer.TokenText + "' at character " + tokenizer.TokenAbsolutePosition + ".");
}
} while (tokenizer.MoveNext());
return(this);
}
public void ParseInto(Query query, String sparql)
{
InitializeParserState();
itsState.Explain = Explain;
itsTokenEnum = TokenizeQuery(sparql);
while (itsTokenEnum.MoveNext())
{
string token = (string)itsTokenEnum.TokenText;
if (Explain)
{
Console.WriteLine(" itsTokenEnum.TokenText is " + token + " (" + itsTokenEnum.Type + ")");
}
itsState = itsState.Handle(this, itsTokenEnum, query);
itsState.Explain = Explain;
}
}
private void ParseFilter(QueryTokenizer tokenizer, PatternGroup group)
{
while (tokenizer.MoveNext())
{
switch (tokenizer.Type)
{
case QueryTokenizer.TokenType.BeginGroup:
break;
case QueryTokenizer.TokenType.EndGroup:
return;
case QueryTokenizer.TokenType.Variable:
Constraint constraint = new Constraint(new VariableExpression(new Variable(tokenizer.TokenText)));
group.AddConstraint(constraint);
break;
}
}
}
public override State Handle(QueryParser parser, QueryTokenizer tokenizer, Query query)
{
if (Explain)
{
Console.WriteLine("Entering DESCRIBE state");
}
do
{
if (Explain)
{
Console.WriteLine(" tokenizer.TokenText is " + tokenizer.TokenText + " (" + tokenizer.Type + ")");
}
switch (tokenizer.Type)
{
case QueryTokenizer.TokenType.KeywordWhere:
if (tokenizer.MoveNext())
{
if (tokenizer.TokenText.Equals("{"))
{
return(new WhereState());
}
}
break;
case QueryTokenizer.TokenType.QuotedIRIRef:
query.AddDescribeTerm(new UriRef(tokenizer.TokenText));
break;
case QueryTokenizer.TokenType.Variable:
Variable var = new Variable(tokenizer.TokenText);
query.AddVariable(var);
query.AddDescribeTerm(var);
break;
default:
break;
}
} while (tokenizer.MoveNext());
return(this);
}
public override State Handle(QueryParser parser, QueryTokenizer tokenizer, Query query)
{
if (Explain)
{
Console.WriteLine("Entering SELECT state");
}
do
{
if (Explain)
{
Console.WriteLine(" tokenizer.TokenText is " + tokenizer.TokenText + " (" + tokenizer.Type + ")");
}
switch (tokenizer.Type)
{
case QueryTokenizer.TokenType.KeywordWhere:
if (tokenizer.MoveNext())
{
if (tokenizer.TokenText.Equals("{"))
{
return(new WhereState());
}
}
break;
case QueryTokenizer.TokenType.Variable:
query.AddVariable(new Variable(tokenizer.TokenText));
break;
case QueryTokenizer.TokenType.Wildcard:
query.SelectAll = true;
break;
case QueryTokenizer.TokenType.BeginGroup:
return(new WhereState());
}
} while (tokenizer.MoveNext());
return(this);
}
public SparqlException(string message, QueryTokenizer tokenizer) : base(message)
{
itsPositionInQuery = tokenizer.TokenAbsolutePosition;
itsPositionInLine = tokenizer.TokenLinePosition;
itsLineInQuery = tokenizer.TokenLine;
}
public abstract State Handle(QueryParser parser, QueryTokenizer tokenizer, Query query);
public override State Handle(QueryParser parser, QueryTokenizer tokenizer, Query query)
{
if (Explain)
{
Console.WriteLine("Entering WHERE state");
}
StartPatternGroup();
query.PatternGroup = itsPatternCollector.PatternGroup;
do
{
if (Explain)
{
Console.WriteLine(" tokenizer.TokenText is " + tokenizer.TokenText + " (" + tokenizer.Type + ")");
}
if (tokenizer.Type == QueryTokenizer.TokenType.BeginGroup)
{
itsPatternCollector.EndTermGroup(query);
itsPatternCollector.IncrementNestingDepth();
}
else if (tokenizer.Type == QueryTokenizer.TokenType.EndGroup)
{
if (itsPatternCollector.HasNestedGroups)
{
itsPatternCollector.EndTermGroup(query);
itsPatternCollector.DecrementNestingDepth();
}
else
{
EndPatternGroup(query);
if (itsPatternCollectorStack.Count == 0)
{
return(new SolutionModifierState());
}
else
{
itsPatternCollector.StartTermGroup();
}
}
}
else if (tokenizer.Type == QueryTokenizer.TokenType.KeywordOptional)
{
if (tokenizer.MoveNext())
{
if (tokenizer.Type == QueryTokenizer.TokenType.BeginGroup)
{
itsPatternCollector.EndTermGroup(query);
StartOptionalPatternGroup();
}
else
{
throw new SparqlException("Error parsing OPTIONAL declaration, expecting { but encountered '" + tokenizer.TokenText + "'", tokenizer);
}
}
else
{
throw new SparqlException("Error parsing OPTIONAL declaration, expecting { but encountered end of query", tokenizer);
}
}
else if (tokenizer.Type == QueryTokenizer.TokenType.KeywordUnion)
{
if (tokenizer.MoveNext())
{
if (tokenizer.Type == QueryTokenizer.TokenType.BeginGroup)
{
itsPatternCollector.EndTermGroup(query);
StartAlternatePatternGroup();
}
else
{
throw new SparqlException("Error parsing UNION declaration, expecting { but encountered '" + tokenizer.TokenText + "'", tokenizer);
}
}
else
{
throw new SparqlException("Error parsing UNION declaration, expecting { but encountered end of query", tokenizer);
}
}
else if (tokenizer.Type == QueryTokenizer.TokenType.KeywordGraph)
{
//TODO
}
else
{
itsPatternCollector.Handle(parser, tokenizer, query);
}
} while (tokenizer.MoveNext());
return(this);
}
public override State Handle(QueryParser parser, QueryTokenizer tokenizer, Query query)
{
return(this);
}
public override State Handle(QueryParser parser, QueryTokenizer tokenizer, Query query)
{
switch (tokenizer.Type)
{
case QueryTokenizer.TokenType.KeywordOrder:
if (tokenizer.MoveNext())
{
if (tokenizer.Type == QueryTokenizer.TokenType.KeywordBy)
{
if (tokenizer.MoveNext())
{
if (tokenizer.Type == QueryTokenizer.TokenType.KeywordAsc)
{
query.OrderDirection = Query.SortOrder.Ascending;
if (!tokenizer.MoveNext())
{
throw new SparqlException("Error parsing ORDER BY declaration, missing ordering expression", tokenizer);
}
}
else if (tokenizer.Type == QueryTokenizer.TokenType.KeywordDesc)
{
query.OrderDirection = Query.SortOrder.Descending;
if (!tokenizer.MoveNext())
{
throw new SparqlException("Error parsing ORDER BY declaration, missing ordering expression", tokenizer);
}
}
Expression orderExpression = parser.ParseExpression( );
query.OrderBy = orderExpression;
}
else
{
throw new SparqlException("Error parsing ORDER BY declaration, missing ordering expression", tokenizer);
}
}
else
{
throw new SparqlException("Error parsing ORDER BY declaration, expecting BY keyword but encountered '" + tokenizer.TokenText + "'", tokenizer);
}
}
else
{
throw new SparqlException("Error parsing ORDER BY declaration, expecting BY keyword but encountered end of query", tokenizer);
}
break;
case QueryTokenizer.TokenType.BeginGroup:
break;
case QueryTokenizer.TokenType.KeywordLimit:
if (tokenizer.MoveNext())
{
if (tokenizer.Type == QueryTokenizer.TokenType.NumericInteger)
{
query.ResultLimit = Convert.ToInt32(tokenizer.TokenText);
break;
}
else
{
throw new SparqlException("Error parsing LIMIT declaration, expecting integer but encountered '" + tokenizer.TokenText + "'", tokenizer);
}
}
else
{
throw new SparqlException("Error parsing LIMIT declaration, expecting number but encountered end of query", tokenizer);
}
case QueryTokenizer.TokenType.KeywordOffset:
if (tokenizer.MoveNext())
{
if (tokenizer.Type == QueryTokenizer.TokenType.NumericInteger)
{
query.ResultOffset = Convert.ToInt32(tokenizer.TokenText);
break;
}
else
{
throw new SparqlException("Error parsing OFFSET declaration, expecting integer but encountered '" + tokenizer.TokenText + "'", tokenizer);
}
}
else
{
throw new SparqlException("Error parsing OFFSET declaration, expecting number but encountered end of query", tokenizer);
}
}
return(this);
}