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8.7

Parse string & return nested list

Asked by HonorGod in Python Scripting Language, Algorithms, Parsers

I'm looking for an elegant solution for string parsing problem.
The string contains bracketed name/value pairs.

I want an elegant solution.
- Don't expect to get points for a quick and dirty solution
  Especially one that "almost" works
I don't want, and won't accept a LEX/YACC solution.
I must be able to implement it in Python 2.1 (so, pyParsing won't work).
I will accept a complete pseudo-code algorithm that I can implement

Notes:
- Name & value are separated by a single space
- Value may be empty (e.g., "[name ]")
- Values may contain other bracketed name/value pairs.
- Nested result may be arbitrarily deep
  - solution must be able to handle nesting at least 7 deep

Sample input: 
1:

[[XXXXXXXXXXXXXXXXXXXX XXXX] [XXXXXXXXXXXXXXXXXX XXXX] [XXXXXXXXXXXXXXXXXXX XXXX] [XXXXXXXXXXXXXXXXXXXXXX XXXXXXXX] [XXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXX] [XXXXXXXXXXXX 999] [XXXXXXXXXXXXXXXXXXXXXX XXXXX] [XXXXXXXXXXX9XXXXXXXX XXXXX] [XXXXXXXXXXXXXXXXXX XXXXX] [XXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXX] [XXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXX] [XXXXXXXXXX [[[XXXX XXXXXXXX.XXXXXXXXXXXXXXXXXXXXXXXXXXXXX] [XXXXX XXXX] ][[XXXX XXX.XXX.XXX.XXXXXXXXXXXXXXXXXXXXXXXXXXXXX] [XXXXX XXXX] ][[XXXX XXX.XXX.XXX.XXXXXXXXXXXXXXXXXXXXXXXXXXXX] [XXXXX XXXX] ][[XXXX XXX.XXX.XXX.XXXXXXXXXXXXXXXXXXXXXXX] [XXXXX XXXXX] ][[XXXX XXX.XXX.XX.XXXXXXXX.XXXXXXXXXXXXXXXXXXXXXXXXXXXX] [XXXXX XXXX] ][[XXXX XXX.XXX.XX.XXXXXXXX.XXXXXXXXXXXXXXXXXXXXX] [XXXXX XXXXX] ][[XXXX XXX.XXX.XXX.XXXXXXXXXXXXXXXXXXXXX] [XXXXX ] ][[XXXX XXX.XXX.XXX.XXXXXXXXXXXXXXXXXXXXX] [XXXXX XXXXXX.XXX_XXXXXXX] ][[XXXX XXX.XXX.XXX.XXXXXXXXXXXXXXXXXXXXXX] [XXXXX XXXXXX.XXX_XXXXXXXX] ][[XXXX XXX.XXX.XX.XXXXXXXX.XXXXXXXXXXXXXXXXXXXXX] [XXXXX XXXXXX.XXX_XXXXXXX] ][[XXXX XXX.XXX.XX.XXXXXXXX.XXXXXXXXXXXXXXXXXX] [XXXXX XXXXXX.XXXXXXX] ][[XXXX XXX.XXX.XXXXX.XXXXXXXX.XXXX.XXXXXXXXXXXX] [XXXXX XXX.XXX.XX.XXXXXXXX.XXXX.XXXXXXXXXXXXXXXX|XXX.XXX.XX.XXXXXXXX.XXXX.XXXXXXXXX9XXXXXXX|XXX.XXX.XX.XXXXXXXX.XXXX.XXXXXXXXXXXXXXXXXXXXX] ][[XXXX XXX.XXX.XXXXX.XXXXXXXX.XXXXX.XXXXXXXXXXXXXXXXXXXXXXXXXX] [XXXXX XXX.XXX.XX.XXXXXXXX.XXXX.XXXXXXXXXXXXXXXX] ][[XXXX XXX.XXX.XXXXX.XXXXXXXX.XXXXX.XXXXXXXXXXXXXXXXXXXXXXXXX] [XXXXX XXX.XXX.XX.XXXXXXXX.XXXX.XXXXXXXXXXXXXXXXXXXXX] ][[XXXX XXX.XXX.XXXXX.XXXXXXXX.XXXXX.XXXXXXXXXXXXXXXXXXXXXXX] [XXXXX XXX.XXX.XX.XXXXXXXX.XXXX.XXXXXXXXXXXXXXXXXXXXX] ][[XXXX XXX.XXX.XXXXX.XXXXXXXX.XXXXX.XXXXXXXXXXXXXXXXXXXXXXXX] [XXXXX XXX.XXX.XX.XXXXXXXX.XXXX.XXXXXXXXX9XXXXXXX] ][[XXXX XXX.XXX.XX.XXXXXXXX.XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX] [XXXXX XXXX] ][[XXXX XXX.XXX.XXXXXXXX.XXXXXXX] [XXXXX XXXXX] ][[XXXX XXX.XXX.XXXXXXXXX.XXXXXXXX.XXXXXXXXXXXXX] [XXXXX XXX.XXX.XX.XXXXXXXX.XXXXXX.XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX] ][[XXXX XXX.XXX.XX.XXXXXXXX.XXXXXXXXXXXXXXXXXXXXXX] [XXXXX XXX.XXX.XXXXXXXX.XXXX.*:XXXXX.XXXXXXXX.XXXX.XXXXXXXX.XXXXXXXXXXX:XXXXX.XXXXXXXX.XXXX.XXXXXXXX.XXXXXXXXXXXXXX] ][[XXXX XXX.XXX.XXXXXXXXX.XXXXXXXX.XXX.XXXXXXXXXXXXX] [XXXXX XXXX] ][[XXXX XXX.XXX.XXXXXXXXX.XXXXXXXX.XXX.XXXXXXXXX_XXXX] [XXXXX XXXX] ][[XXXX XXX.XXX.XXX.XXXXXXXXXXXXXXXXXXXXXXX] [XXXXX XX=XXXXXX99.XXX.XXXXXXX.XXX.XXX,XX=XXXXXX99XXXX99XXXX,XX=XXXXXX99XXXX99,X=XXX,X=XX] ][[XXXX XXX.XXX.XXX.XXXXXXXXXXXXXXXXX] [XXXXX [XX=XXXXXX99.XXX.XXXXXXX.XXX.XXX,XX=XXXX XXXXXXXXXXX,XX=XXXXXX99XXXX99XXXX,XX=XXXXXX99XXXX99,X=XXX,X=XX]] ][[XXXX XXX.XXX.XXX.XXXXXXXXXXXXXXXXX] [XXXXX 9999] ][[XXXX XXX.XXX.XXX.XXXXXXXXXXXXXXXXXX] [XXXXX 999] ]]] ]
[+][-]08/17/09 01:53 AM, ID: 25112461Expert Comment

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[+][-]08/17/09 06:16 AM, ID: 25114013Accepted Solution

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Zones: Python Scripting Language, Algorithms, Parsers
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Solution Grade: A
 
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