| 1 | import operator |
| 2 | |
| 3 | def pfxmatch(pfx, item): |
| 4 | return str(item)[:len(pfx)] == pfx |
| 5 | |
| 6 | def ipfxmatch(pfx, item): |
| 7 | return str(item).upper()[:len(pfx)] == pfx.upper() |
| 8 | |
| 9 | class ambiguous(LookupError): |
| 10 | def __init__(self, a, b): |
| 11 | super().__init__("ambigous match: %s and %s" % (a, b)) |
| 12 | self.a = a |
| 13 | self.b = b |
| 14 | |
| 15 | def find(seq, *, item=None, test=None, match=None, key=None, default=LookupError): |
| 16 | if key is None: |
| 17 | key = lambda o: o |
| 18 | if match is None and item is not None: |
| 19 | match = lambda o: test(item, o) |
| 20 | if test is None: |
| 21 | test = operator.eq |
| 22 | found = None |
| 23 | for thing in seq: |
| 24 | if match(key(thing)): |
| 25 | if found is None: |
| 26 | found = thing |
| 27 | else: |
| 28 | if default is LookupError: |
| 29 | raise ambiguous(key(found), key(thing)) |
| 30 | else: |
| 31 | return default |
| 32 | if found is not None: |
| 33 | return found |
| 34 | if default is LookupError: |
| 35 | raise LookupError() |
| 36 | else: |
| 37 | return default |