eta.util.general.extract_category

extract_category(lst, catfn, ignfn=None)

Recurse through a (possibly nested) list and extract categories that satisfy a given function.

Parameters:

• lst (s-expr) –

• catfn (function) – A function used to match categories to be extracted.

• ignfn (function, optional) – If given, a function used to ignore matching subexpressions (i.e., avoid recursing within them).

Returns:

• lst_new (s-expr) – The input list with matching subexpressions removed.

• categories (list[s-expr]) – A list of extracted matching subexpressions.