private SparqlUpdateCommand TryParseInsertCommand(SparqlUpdateParserContext context, bool allowData)
{
List<Uri> usings = new List<Uri>();
List<Uri> usingNamed = new List<Uri>();
IToken next = context.Tokens.Dequeue();
if (allowData)
{
//We are allowed to have an INSERT DATA command here so check for it
if (next.TokenType == Token.DATA) return this.TryParseInsertDataCommand(context);
}
else
{
if (next.TokenType == Token.DATA) throw ParserHelper.Error("The DATA keyword is not permitted here as this INSERT command forms part of a modification command", next);
}
//Get the Modification Template
GraphPattern insertions = this.TryParseModifyTemplate(context);
//Then we expect a WHERE keyword
next = context.Tokens.Dequeue();
if (next.TokenType == Token.USING)
{
foreach (KeyValuePair<Uri, bool> kvp in this.TryParseUsingStatements(context))
{
if (kvp.Value)
{
usingNamed.Add(kvp.Key);
}
else
{
usings.Add(kvp.Key);
}
}
next = context.Tokens.Dequeue();
}
if (next.TokenType != Token.WHERE) throw ParserHelper.Error("Unexpected Token '" + next.GetType().ToString() + "' encountered, expected a WHERE keyword as part of a INSERT command", next);
//Now parse the WHERE pattern
SparqlQueryParserContext subContext = new SparqlQueryParserContext(context.Tokens);
subContext.Query.BaseUri = context.BaseUri;
subContext.Query.NamespaceMap = context.NamespaceMap;
subContext.ExpressionParser.NamespaceMap = context.NamespaceMap;
subContext.ExpressionParser.ExpressionFactories = context.ExpressionFactories;
subContext.ExpressionFactories = context.ExpressionFactories;
GraphPattern where = context.QueryParser.TryParseGraphPattern(subContext, context.Tokens.LastTokenType != Token.LEFTCURLYBRACKET);
//And finally return the command
InsertCommand cmd = new InsertCommand(insertions, where);
usings.ForEach(u => cmd.AddUsingUri(u));
usingNamed.ForEach(u => cmd.AddUsingNamedUri(u));
return cmd;
}
