Am 25.10.2012 00:26 schrieb Cameron Simpson:
If I could write this as:
if re_FUNKYPATTERN.match(test_string) as m:
do stuff with the results of the match, using "m"
then some cascading parse decisions would feel a bit cleaner. Where I
current have this:
m = re_CONSTRUCT1.match(line)
if m:
... handle construct 1 ...
else:
m = re_CONSTRUCT2.match(line)
if m:
... handle construct 2 ...
else:
m = re_CONSTRUCT3.match(line)
I could have this:
if re_CONSTRUCT1.match(line) as m:
... handle construct 1 ...
elif re_CONSTRUCT2.match(line) as m:
... handle construct 2 ...
elif re_CONSTRUCT3.match(line) as m:
I would do
for r in re_CONSTRUCT1, re_CONSTRUCT2, re_CONSTRUCT3:
m = r.match(line)
if m: handle_construct
or maybe
actions = {re_CONSTRUCT1: action1, ...}
def matching(line, *rr):
for r in rr:
m = r.match(line)
if m: yield r; return
for r in matching(line, *actions.keys()):
actions[r]()
break
else:
raise NoActionMatched() # or something like that
Thomas
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