Can I read the delimiter of a Separated parser?

[deanebarker]

Say I do this:

var booleanDelimiter = OneOf(Terms.Text("and"), Terms.Text("or"));

Then I use that parser as the delimiter for a Separated parser:

Separated(booleanDelimeter, filterClause).Then(v => // config my filter);

As part of the filter, I want to know if it was prefaced by an and or an or. To do this, I need to read from the booleanDelimiter.

Is this possible? Or is there a better way?

[sebastienros]

I would say that Separated is not the best construct here, and you'd better use filterClause.And(ZeroOrMany(booleanDelimiter.And(filterClause)))

Note that this will result in left-precedence for and/or, meaning there won't be a priority on either of them (like + vs *) because you are reading from left to right. Usual grammars use a recursive approach when you get a tree-like structure to define precedence of operators. Liquid for instance does the same thing you are doing here (which is uncommon).

[sebastienros]

So yeah, Separated is more a "forget about me" thing for the separator.