Logic for identifying start/end does not always work in EDI

[zavoraad]

x12-edi-parser/databricksx12/edi.py

Lines 104 to 125 in 450c174

	#
	# Find all locations of a transaction
	#
	def _transaction_locations(self):
	return [(i - int(x.element(1))+1,i+1) for i,x in self.segments_by_name_index("SE")]
	#
	# Fold left, given a
	# @param functional_group = tuple (i,x)
	# @param where i = start location in file of trailer segment
	# @param where x = number of transactions in the functional group
	#
	# @return a tuple of the start/end locations of the transactions
	#
	def _functional_segments_trx_list(self, functional_group):
	l = ()
	f = lambda trxs, x, fg: x if len(trxs) <= fg[1] and x[1] <= fg[0] else None
	return functools.reduce(lambda a,b: (min(a[0], b[0]), max(a[1], b[1])),
	filter(
	lambda y: y is not None, [l := f(l, x, functional_group) for x in self._transaction_locations()]
	)
	)