def _split_msh(content):
m = re.match("^MSH(?P<field_sep>\S)", content)
if m is not None: # if the regular expression matches, it is an HL7 message
field_sep = m.group('field_sep') # get the field separator (first char after MSH)
msh = content.split("\r", 1)[0] # get the first segment
fields = msh.split(field_sep)
seps = fields[1] # get the remaining encoding chars (MSH.2)
if len(seps) > len(set(seps)):
raise InvalidEncodingChars("Found duplicate encoding chars")
try:
comp_sep, rep_sep, escape, sub_sep = seps
except ValueError:
if len(seps) < N_SEPS:
raise InvalidEncodingChars('Missing required encoding chars')
else:
raise InvalidEncodingChars('Found {0} encoding chars'.format(len(seps)))
else:
encoding_chars = {
'FIELD': field_sep,
'COMPONENT': comp_sep,
'SUBCOMPONENT': sub_sep,
'REPETITION': rep_sep,
'ESCAPE': escape,
'SEGMENT': '\r',
'GROUP': '\r',
}
else:
raise ParserError("Invalid message")
return fields, encoding_chars
def check_encoding_chars(encoding_chars):
"""
Validate the given encoding chars
:type encoding_chars: ``dict``
:param encoding_chars: the encoding chars (see :func:`hl7apy.set_default_encoding_chars`)
:raises: :exc:`hl7apy.exceptions.InvalidEncodingChars` if the given encoding chars are not valid
"""
if not isinstance(encoding_chars, collections.MutableMapping):
raise InvalidEncodingChars
required = {'FIELD', 'COMPONENT', 'SUBCOMPONENT', 'REPETITION', 'ESCAPE'}
missing = required - set(encoding_chars.keys())
if missing:
raise InvalidEncodingChars('Missing required encoding chars')
values = [v for k, v in encoding_chars.items() if k in required]
if len(values) > len(set(values)):
raise InvalidEncodingChars('Found duplicate encoding chars')