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Slightly cleaner parser

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This commit is contained in:
Bert Peters
2022-12-07 16:01:09 +01:00
parent 45a6c78d77
commit eec886b5e2
1 changed files with 3 additions and 8 deletions
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11
2022/src/day07.rs
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@@ -9,7 +9,6 @@ use nom::combinator::opt;
use nom::multi::fold_many0;
use nom::sequence::delimited;
use nom::sequence::preceded;
use nom::sequence::separated_pair;
use nom::sequence::terminated;
use nom::sequence::tuple;
use nom::IResult;
@@ -37,14 +36,9 @@ fn parse_dir<'a>(
// of either
alt((
// A size followed by a name
map(
separated_pair(u32, tag(" "), take_until("\n")),
|(size, _)| Entry::File(size),
),
map(terminated(u32, take_until("\n")), Entry::File),
// Or the word "dir" followed by a name
map(preceded(tag("dir "), take_until("\n")), |name| {
Entry::Dir(name)
}),
map(preceded(tag("dir "), take_until("\n")), Entry::Dir),
)),
newline,
),
@@ -72,6 +66,7 @@ fn parse_dir<'a>(
}
dirs.push(size);
dir_stack.truncate(initial_len);
Ok((input, size))
}