Document trivial case

RASP_support/DrawCompFlow.py

@@ -464,7 +464,10 @@ def __init__(self, depth, d_heads, d_ffs, add_tokens_on_ff=False):
 			ff_parents += ff.get_nonminor_parent_sequences()
 		ff_parents = list(set(ff_parents))
 		ff_parents = [p for p in ff_parents if not guarded_contains(d_ffs, p)]
+		# in the trivial case (no parents and only one ff), the ff is marked as
+		# constant
 		if not ff_parents and len(d_ffs) == 1 and d_ffs[0]._constant:
+			# switch the parents and ffs to label the trivial ff as 'X'
 			ff_parents, d_ffs = d_ffs, ff_parents
 		rows_by_type = {RES: d_ffs, VVAR: ff_parents}
 		rowtype_order = [VVAR, RES]

RASP_support/analyse.py

@@ -183,8 +183,10 @@ def __init__(self, select, sequences, comp_depth):
 
 	all_ffs = self.get_full_seq_parents()
 	if len(all_ffs) > 1:
+		# filter out non-ffs in the non-trivial case
 		all_ffs = [m for m in all_ffs if m.from_zipmap]
 	else:
+		# mark the sequence as constant (indices / tokens) in the trivial case
 		for ff in all_ffs:
 			ff._constant = True
 	if remove_minors: