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