def as_path(tokeniser):
as_path = []
insert = None
while True:
value = tokeniser()
if value == '[':
value = tokeniser.peek()
if value != '{':
insert = SEQUENCE()
else:
insert = CONFED_SEQUENCE()
elif value == '(':
value = tokeniser.peek()
if value != '{':
insert = SET()
else:
insert = CONFED_SET()
elif len(as_path) == 0:
try:
return ASPath(ASN.from_string(value))
except ValueError:
raise ValueError('could not parse as-path')
else:
raise ValueError('could not parse as-path')
while True:
value = tokeniser()
# could be too nice eating a trailing and ignore a erroneous },,
# but simpler that way
if value in (',', '}'):
continue
if value in (')', ']'):
as_path.append(insert)
value = tokeniser.peek()
if value in ('[', '('):
break
return ASPath(as_path)
try:
insert.append(ASN.from_string(value))
continue
except ValueError:
raise ValueError('could not parse as-path')
def as_path(tokeniser):
as_seq = []
as_set = []
value = tokeniser()
inset = False
try:
if value == '[':
while True:
value = tokeniser()
if value == ',':
continue
if value in ('(', '['):
inset = True
while True:
value = tokeniser()
if value in (')', ']'):
break
as_set.append(ASN.from_string(value))
if value == ')':
inset = False
continue
if value == ']':
if inset:
inset = False
continue
break
as_seq.append(ASN.from_string(value))
else:
as_seq.append(ASN.from_string(value))
except ValueError:
raise ValueError('could not parse as-path')
return ASPath(as_seq, as_set)
def aspath(self, scope, name, command, tokens):
as_seq = []
as_set = []
asn = tokens.pop(0)
inset = False
try:
if asn == '[':
while True:
try:
asn = tokens.pop(0)
except IndexError:
return self.error.set(self.syntax)
if asn == ',':
continue
if asn in ('(', '['):
inset = True
while True:
try:
asn = tokens.pop(0)
except IndexError:
return self.error.set(self.syntax)
if asn == ')':
break
as_set.append(Basic.newASN(asn))
if asn == ')':
inset = False
continue
if asn == ']':
if inset:
inset = False
continue
break
as_seq.append(Basic.newASN(asn))
else:
as_seq.append(Basic.newASN(asn))
except (IndexError, ValueError):
return self.error.set(self.syntax)
scope[-1]['announce'][-1].attributes.add(ASPath(as_seq, as_set))
return True
