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# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
from __future__ import absolute_import, division
from twisted.python.compat import intToBytes
def parse(s):
s = s.strip()
expr = []
while s:
if s[0:1] == b'(':
newSexp = []
if expr:
expr[-1].append(newSexp)
expr.append(newSexp)
s = s[1:]
continue
if s[0:1] == b')':
aList = expr.pop()
s=s[1:]
if not expr:
assert not s
return aList
continue
i = 0
while s[i:i+1].isdigit(): i+=1
assert i
length = int(s[:i])
data = s[i+1:i+1+length]
expr[-1].append(data)
s=s[i+1+length:]
assert 0, "this should not happen"
def pack(sexp):
s = b""
for o in sexp:
if type(o) in (type(()), type([])):
s+=b'('
s+=pack(o)
s+=b')'
else:
s+=intToBytes(len(o)) + b":" + o
return s
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