private Expression GetExpression(LessParser.ExpressionContext context)
{
Expression GetExpressionOrList(int start, int end)
{
int itemCount = end - start;
if (itemCount == 1)
{
return(GetSingleValuedExpression((LessParser.SingleValuedExpressionContext)context.GetChild(start)));
}
var childExpressions = context.children
.Skip(start)
.Take(itemCount)
.Select(c => GetSingleValuedExpression((LessParser.SingleValuedExpressionContext)c));
return(new ExpressionList(childExpressions, ' '));
}
IEnumerable <Expression> GetCommaSeparatedExpressions()
{
var commaStops = context.children
.Select((t, i) => (Node: t, Index: i))
.Where(p => p.Node is ITerminalNode)
.Select(p => p.Index);
int current = 0;
foreach (var commaStop in commaStops)
{
yield return(GetExpressionOrList(current, commaStop));
current = commaStop + 1;
}
yield return(GetExpressionOrList(current, context.children.Count));
}
if (context == null)
{
return(null);
}
var commas = context.COMMA();
if (commas.Length > 0)
{
return(new ExpressionList(GetCommaSeparatedExpressions(), ','));
}
var expressions = context.singleValuedExpression();
if (expressions.Length > 1)
{
return(new ExpressionList(expressions.Select(GetSingleValuedExpression), ' '));
}
return(GetSingleValuedExpression(expressions[0]));
}
public virtual LessNode VisitExpression(LessParser.ExpressionContext context)
{
throw new System.NotImplementedException();
}
public override LessNode VisitExpression(LessParser.ExpressionContext context)
{
return(GetExpression(context));
}
