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https://github.com/dgelessus/python-rsrcfork.git
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Refactor filter_resources in __main__
With the new implementation, each filter is converted to a function, then all resources are checked if they match any of the filter functions. This is simpler than the old implementation, where the resource lookup code was slightly different for some filter forms.
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dgelessus
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c009e8f80f
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@ -83,84 +83,60 @@ def bytes_escape(bs: bytes, *, quote: typing.Optional[str]=None) -> str:
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return "".join(out)
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def filter_resources(rf: api.ResourceFile, filters: typing.Sequence[str]) -> typing.List[api.Resource]:
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if not filters:
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resources = []
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for reses in rf.values():
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resources.extend(reses.values())
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return resources
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matching: typing.MutableMapping[typing.Tuple[bytes, int], api.Resource] = collections.OrderedDict()
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for filter in filters:
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if len(filter) == 4:
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try:
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resources = rf[filter.encode("ascii")]
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except KeyError:
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continue
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for res in resources.values():
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matching[res.type, res.id] = res
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elif filter[0] == filter[-1] == "'":
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try:
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resources = rf[bytes_unescape(filter[1:-1])]
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except KeyError:
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continue
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for res in resources.values():
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matching[res.type, res.id] = res
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def filter_to_predicate(filter: str) -> typing.Callable[[api.Resource], bool]:
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if len(filter) == 4:
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restype = filter.encode("ascii")
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return lambda res: res.type == restype
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elif filter[0] == filter[-1] == "'":
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restype = bytes_unescape(filter[1:-1])
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return lambda res: res.type == restype
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else:
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pos = filter.find("'", 1)
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if pos == -1:
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raise ValueError(f"Invalid filter {filter!r}: Resource type must be single-quoted")
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elif filter[pos + 1] != " ":
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raise ValueError(f"Invalid filter {filter!r}: Resource type and ID must be separated by a space")
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restype_str, resid_str = filter[:pos + 1], filter[pos + 2:]
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if not restype_str[0] == restype_str[-1] == "'":
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raise ValueError(
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f"Invalid filter {filter!r}: Resource type is not a single-quoted type identifier: {restype_str!r}")
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restype = bytes_unescape(restype_str[1:-1])
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if len(restype) != 4:
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raise ValueError(
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f"Invalid filter {filter!r}: Type identifier must be 4 bytes after replacing escapes, got {len(restype)} bytes: {restype!r}")
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if resid_str[0] != "(" or resid_str[-1] != ")":
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raise ValueError(f"Invalid filter {filter!r}: Resource ID must be parenthesized")
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resid_str = resid_str[1:-1]
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if resid_str[0] == resid_str[-1] == '"':
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name = bytes_unescape(resid_str[1:-1])
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return lambda res: res.type == restype and res.name == name
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elif ":" in resid_str:
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if resid_str.count(":") > 1:
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raise ValueError(f"Invalid filter {filter!r}: Too many colons in ID range expression: {resid_str!r}")
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start_str, end_str = resid_str.split(":")
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start, end = int(start_str), int(end_str)
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return lambda res: res.type == restype and start <= res.id <= end
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else:
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pos = filter.find("'", 1)
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if pos == -1:
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raise ValueError(f"Invalid filter {filter!r}: Resource type must be single-quoted")
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elif filter[pos + 1] != " ":
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raise ValueError(f"Invalid filter {filter!r}: Resource type and ID must be separated by a space")
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restype_str, resid_str = filter[:pos + 1], filter[pos + 2:]
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if not restype_str[0] == restype_str[-1] == "'":
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raise ValueError(
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f"Invalid filter {filter!r}: Resource type is not a single-quoted type identifier: {restype_str!r}")
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restype = bytes_unescape(restype_str[1:-1])
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if len(restype) != 4:
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raise ValueError(
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f"Invalid filter {filter!r}: Type identifier must be 4 bytes after replacing escapes, got {len(restype)} bytes: {restype!r}")
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if resid_str[0] != "(" or resid_str[-1] != ")":
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raise ValueError(f"Invalid filter {filter!r}: Resource ID must be parenthesized")
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resid_str = resid_str[1:-1]
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try:
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resources = rf[restype]
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except KeyError:
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continue
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if resid_str[0] == resid_str[-1] == '"':
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name = bytes_unescape(resid_str[1:-1])
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for res in resources.values():
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if res.name == name:
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matching[res.type, res.id] = res
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break
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elif ":" in resid_str:
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if resid_str.count(":") > 1:
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raise ValueError(f"Invalid filter {filter!r}: Too many colons in ID range expression: {resid_str!r}")
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start_str, end_str = resid_str.split(":")
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start, end = int(start_str), int(end_str)
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for res in resources.values():
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if start <= res.id <= end:
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matching[res.type, res.id] = res
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else:
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resid = int(resid_str)
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try:
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res = resources[resid]
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except KeyError:
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continue
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matching[res.type, res.id] = res
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return list(matching.values())
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resid = int(resid_str)
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return lambda res: res.type == restype and res.id == resid
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def filter_resources(rf: api.ResourceFile, filters: typing.Sequence[str]) -> typing.Iterable[api.Resource]:
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if not filters:
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# Special case: an empty list of filters matches all resources rather than none
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for reses in rf.values():
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yield from reses.values()
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else:
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preds = [filter_to_predicate(filter) for filter in filters]
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for reses in rf.values():
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for res in reses.values():
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if any(pred(res) for pred in preds):
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yield res
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def hexdump(data: bytes) -> None:
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last_line = None
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@ -556,7 +532,7 @@ or rewritten by the shell.
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ns = ap.parse_args(args)
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with open_resource_file(ns.file, fork=ns.fork) as rf:
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resources = filter_resources(rf, ns.filter)
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resources = list(filter_resources(rf, ns.filter))
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if ns.sort:
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resources.sort(key=lambda res: (res.type, res.id))
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