public static Either <ParseException, Pair <List <IToken>, RelationNode> > Parse(List <IToken> tokens, IScopedTable <IEntityType, string> parentTypeTable)
{
Console.WriteLine("RelationNode");
var maybeSimple = SimpleNode.Parse(tokens, parentTypeTable);
if (maybeSimple.IsLeft)
{
return(maybeSimple.LeftToList()[0]);
}
var simple1 = maybeSimple.RightToList()[0].Second;
tokens = maybeSimple.RightToList()[0].First;
if (tokens.Count < 1)
{
return(new Pair <List <IToken>, RelationNode>(tokens, new RelationNode(simple1, parentTypeTable)));
}
if (!(tokens[0] is LeOperatorToken || tokens[0] is LtOperatorToken ||
tokens[0] is GeOperatorToken || tokens[0] is GtOperatorToken ||
tokens[0] is EqualsOperatorToken || tokens[0] is NotEqualsOperatorToken))
{
return(new Pair <List <IToken>, RelationNode>(tokens, new RelationNode(simple1, parentTypeTable)));
}
var token = tokens[0];
tokens = tokens.Skip(1).ToList();
var maybeSimple2 = SimpleNode.Parse(tokens, parentTypeTable);
if (maybeSimple2.IsLeft)
{
return(maybeSimple2.LeftToList()[0]);
}
var simple2 = maybeSimple2.RightToList()[0].Second;
tokens = maybeSimple2.RightToList()[0].First;
while (tokens.Count > 0)
{
if (tokens[0] is NewLineSymbolToken || tokens[0] is CommentToken)
{
tokens = tokens.Skip(1).ToList();
}
else
{
break;
}
}
return(new Pair <List <IToken>, RelationNode>(tokens, new RelationNode(simple1, token, simple2, parentTypeTable)));
}
private RelationNode(SimpleNode simple1, IScopedTable <IEntityType, string> parentTypeTable)
{
Simple1 = simple1;
ParentTypeTable = parentTypeTable;
}