On Jun 4, 3:14 pm, Alain Ketterlin <al...@dpt-info.u-strasbg.fr>
wrote:
> richard <pullenjenn...@gmail.com> writes:
> > Hi guys i am having a bit of dificulty finding the best approach /
> > solution to parsing a file into a list of objects / nested objects any
> > help would be greatly appreciated.
>
> > #file format to parse .txt
> > [code]
> > An instance of TestArray
> > a=a
> > b=b
> > c=c
> > List of 2 A elements:
> > Instance of A element
>
> [...]
>
> Below is a piece of code that seems to work on your data. It builds a
> raw tree, i leave it to you to adapt and built the objects you want. The
> assumption is that the number of leading blanks faithfully denotes
> depth.
>
> As noted in another message, you're probably better off using an
> existing syntax (json, python literals, yaml, xml, ...)
>
> -- Alain.
>
> #!/usr/bin/env python
>
> import sys
> import re
>
> RE = re.compile("( *)(.*)")
> stack = [("-",[])] # tree nodes are: (head,[children])
> for line in sys.stdin:
> matches = RE.match(line)
> if len(matches.group(2)) > 0:
> depth = 1 + len(matches.group(1))
> while len(stack) > depth:
> stack[-2][1].append(stack[-1])
> del stack[-1]
> pass
> stack.append( (matches.group(2),[]) )
> pass
> pass
> while len(stack) > 1:
> stack[-2][1].append(stack[-1])
> del stack[-1]
> pass
>
> print(stack)
thank you both for your replies. Unfortunately it is a pre-existing
file format imposed by an external system that I can't
change. Thank you for the code snippet.
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