need simple parsing ability
gry at ll.mit.edu
Fri Jul 16 17:13:24 CEST 2004
[python 2.3.3, x86 linux]
For each run of my app, I have a known set of (<100) wafer names.
Names are sometimes simply integers, sometimes a short string, and
sometimes a short string followed by an integer, e.g.:
5, 6, 7, 8, 9, bar, foo_6, foo_7, foo_8, foo_9, foo_10, foo_11
I need to read user input of a subset of these. The user will type a
set of names separated by commas (with optional white space), but there
may also be sequences indicated by a dash between two integers, e.g.:
"9-11" meaning 9,10,11
"foo_11-13" meaning foo_11, foo_12, and foo_13.
"foo_9-11" meaning foo_9,foo_10,foo_11, or
"bar09-11" meaning bar09,bar10,bar11
(Yes, I have to deal with integers with and without leading zeros)
[I'll proclaim inverse sequences like "foo_11-9" invalid]
So a sample input might be:
9,foo7-9,2-4,xxx meaning 9,foo7,foo8,foo9,2,3,4,xxx
The order of the resultant list of names is not important; I have
to sort them later anyway.
Fancy error recovery is not needed; an invalid input string will be
peremptorily wiped from the screen with an annoyed beep.
Can anyone suggest a clean way of doing this? I don't mind
installing and importing some parsing package, as long as my code
using it is clear and simple. Performance is not an issue.
-- George Young
"Are the gods not just?" "Oh no, child.
What would become of us if they were?" (CSL)
More information about the Python-list