class ReWithMemory(object): def search(self, are, aline): self.mo = re.search(are, aline) return self.mo def group(self, n): return self.mo.group(n)
m = ReWithMemory()
if m.search(r'add (\d+) (\d+)', line): do_add(m.group(1), m.group(2)) elif m.search(r'mult (\d+) (\d+)', line): do_mult(m.group(1), m.group(2)) elif m.search(r'help (\w+)', line): show_help(m.group(1))
Demeter's Law suggests that the 'm.value.group' accesses in your approach are better handled by having m delegate to its `value'; and the repeated m.set(re.search( ... seem to be a slight code smell, violating "once and only once", which suggests merging into a single `set' method. Your approach is more general, of course.
I get a bit uneasy from the repeated calls to m.group... If I was going to build a class around the re, I think I might lean towards something like:
class ReWithMemory(object): def search(self, are, aline): self.mo = re.search(are, aline) return self.mo def groups(self, *indices): return [self.mo.group(i) for i in indices]
m = ReWithMemory()
if m.search(r'add (\d+) (\d+)', line): do_add(*m.groups(1, 2)) elif m.search(r'mult (\d+) (\d+)', line): do_mult(*m.groups(1, 2)) elif m.search(r'help (\w+)', line): show_help(*m.groups(1))
Of course, this is even less general-purpose than yours...
(And if I saw myself using this much regex code, I'd probably reconsider my strategy anyway.) ;)
Steve -- http://mail.python.org/mailman/listinfo/python-list