span_getter argument

[aricohen93]

edsnlp/edsnlp/pipes/qualifiers/base.py

Lines 121 to 132 in f14900d

	if on_ents_only:
	assert span_getter is None or on_ents_only is True, (
	"Cannot use both `span_getter` and `on_ents_only` as a span selection "
	"argument."
	)
	assert isinstance(on_ents_only, (list, str, set, bool)), (
	"The `on_ents_only` argument should be a "
	"string, a bool, a list or a set of string"
	)
	span_getter = "ents" if on_ents_only is True else on_ents_only
	else:
	span_getter = "ents"

It's a little confusing the usage of span_getter and on_ents_only. Both are non optional arguments but
I have the impression that span_getter taks either the value "ents" or either the value of on_ents_only.

So, what is it supposed to do ?