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# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
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 False, "this should not happen"
def pack(sexp):
return b"".join(
b"(%b)" % (pack(o),)
if type(o) in (type(()), type([]))
else b"%d:%b" % (len(o), o)
for o in sexp
)