public override void Visit(SliceExpr expr)
{
if (expr.Target == null)
{
_needsAsync = true;
}
}
private Expr ParseIndexExpr(Expr prev)
{
var openBracket = Match("[");
var next = GetToken();
Expr projectionFilter = null;
if (next.Kind == "STRING" && GetToken(1).Kind == "]")
{
Match("STRING");
Match("]");
projectionFilter = new KeyExpr(GetLocation(next), prev, next.Text);
}
else if (next.Kind == "..")
{
Match("..");
next = GetToken();
if (next.Kind == "]")
{
Match("]");
projectionFilter = new SliceExpr(GetLocation(openBracket), prev, null, null);
}
else
{
var upperBound = ParseExpr();
projectionFilter = new SliceExpr(GetLocation(openBracket), prev, null, upperBound);
}
}
else
{
var filter = ParseExpr();
next = GetToken();
if (next.Kind == "..")
{
Expr upperBound = null;
Match("..");
next = GetToken();
if (next.Kind != "]")
{
upperBound = ParseExpr();
}
Match("]");
projectionFilter = new SliceExpr(GetLocation(openBracket), prev, filter, upperBound);
}
else
{
Match("]");
projectionFilter = new IndexExpr(GetLocation(openBracket), prev, filter);
}
}
return(projectionFilter);
}
public virtual void Visit(SliceExpr expr)
{
}