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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] == '(':
newSexp = []
if expr:
expr[-1].append(newSexp)
expr.append(newSexp)
s = s[1:]
continue
if s[0] == ')':
aList = expr.pop()
s=s[1:]
if not expr:
assert not s
return aList
continue
i = 0
while s[i].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 = ""
for o in sexp:
if type(o) in (type(()), type([])):
s+='('
s+=pack(o)
s+=')'
else:
s+='%i:%s' % (len(o), o)
return s
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