public RelationSymbol(RelationNode node) : base(node)
{
if (node.Attributes == null)
{
attributeCount = -1;
HasEmptyAtts = true;
}
else
{
attributeCount = node.Attributes.Count;
attributes = node.Attributes;
}
tuples = new List <QLEntity[]>();
Header = "Relation->";
}
public override void TearDownContext()
{
if (secondaryVariable.Count == 0)
{
ParentFuncNode.LastStatement.SetSetReturn(new SetNode(primeVariable));
}
else
{
var relation = new RelationNode(primeVariable);
if (secondaryVariable.Count == 1 && secondaryVariable[0] == EmptyRelAtts)
{
relation.IsEmptyArgs = true;
}
else
{
relation.Attributes = secondaryVariable.ToList();
}
ParentFuncNode.LastStatement.SetRelationReturn(relation);
}
primeVariable = null;
secondaryVariable.Clear();
}
public void SetRelationReturn(RelationNode returnRelatioNode)
{
returnRelatioNode.Parent = this;
ReturnRelationNode = returnRelatioNode;
}
public override void AddNode(string value, ParserParts parserPart)
{
switch (parserPart)
{
case ParserParts.DefOp:
if (GlobalFunctionId == value)
{
astBuilder.globalFunctionNode = new FunctionNode(value);
astBuilder.currentFunctionNode = astBuilder.globalFunctionNode;
}
else
{
var userFuncNode = new UserFunctionNode(value);
astBuilder.globalFunctionNode.UserFunctions.Add(userFuncNode);
astBuilder.currentFunctionNode = userFuncNode;
}
break;
case ParserParts.DefAlias:
if (!value.StartsWith(":"))
{
throw new ArgumentException("Alias does not start with :");
}
((UserFunctionNode)astBuilder.currentFunctionNode).Alias = value.Substring(1, value.Length - 1);
break;
case ParserParts.SetRelFormalArg:
//((UserFunctionNode)astBuilder.currentFunctionNode).AddArguement(); = value;
break;
case ParserParts.SetRelArg:
primeVariable = value;
break;
case ParserParts.RelAttStr:
var strInt = new StrInt(value, null);
secondaryVariable.Add(strInt);
break;
case ParserParts.RelAttIndex:
var strInt2 = new StrInt(null, int.Parse(value) - 1);
secondaryVariable.Add(strInt2);
break;
case ParserParts.SetRelFormalArgEnd:
if (secondaryVariable.Count == 0)
{
((UserFunctionNode)astBuilder.currentFunctionNode).AddArguement(new SetNode(primeVariable));
}
else
{
var relation = new RelationNode(primeVariable); //todo numeric index bzw empty args
relation.Attributes = secondaryVariable.Select(t => t.Item1).ToList();
((UserFunctionNode)astBuilder.currentFunctionNode).AddArguement(relation);
}
primeVariable = null;
secondaryVariable.Clear();
break;
default:
throw new InvalidOperationException();
}
}
