See https://bugs.python.org/issue46692. It's not so easy to make match
objects mappings or sequences because of the len() problem.
Eric
On 2/16/2022 9:46 AM, Valentin Berlier wrote:
Hi,
I've been thinking that it would be nice if regex match objects could be
deconstructed with pattern matching. For example, a simple .obj parser could
use it like this:
match re.match(r"(v|f) (\d+) (\d+) (\d+)", line):
case ["v", x, y, z]:
print("Handle vertex")
case ["f", a, b, c]:
print("Handle face")
Sequence patterns would extract groups directly. Mapping patterns could be used
to extract named groups, which would be nice for simple parsers/tokenizers:
match re.match(r"(?P<number>\d+)|(?P<add>\+)|(?P<mul>\*)", line):
case {"number": str(value)}:
return Token(type="number", value=int(value))
case {"add": str()}:
return Token(type="add")
case {"mul": str()}:
return Token(type="mul")
Right now, match objects aren't proper sequence or mapping types though, but
that doesn't seem too complicated to achieve. If this is something that enough
people would consider useful I'm willing to look into how to implement this.
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