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Use enumerate combinator

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This commit is contained in:
Bert Peters
2022-12-06 18:19:42 +01:00
parent e887a8ad0d
commit 391bba24c5
2 changed files with 16 additions and 7 deletions
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11
2022/src/day05.rs
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@@ -16,17 +16,16 @@ use nom::sequence::terminated;
use nom::sequence::tuple;
use nom::IResult;
use crate::common::enumerate;
use crate::common::parse_input;
type Move = (usize, usize, usize);
type OwnedStacks = Vec<Vec<u8>>;
fn parse_row<'a>(input: &'a [u8], stacks: &mut OwnedStacks) -> IResult<&'a [u8], ()> {
let mut index = 0usize;
// Forgive me for this crime
fold_many1(
terminated(
enumerate(terminated(
alt((
// Parse a delimited value into a Some(content)
map(delimited(tag("["), take(1usize), tag("]")), |v: &[u8]| {
@@ -36,9 +35,9 @@ fn parse_row<'a>(input: &'a [u8], stacks: &mut OwnedStacks) -> IResult<&'a [u8],
map(tag(" "), |_| None),
)),
opt(tag(" ")),
),
)),
|| (),
move |_, c| {
move |_, (index, c)| {
if let Some(b) = c {
if stacks.len() <= index {
stacks.resize_with(index + 1, Vec::new);
@@ -46,8 +45,6 @@ fn parse_row<'a>(input: &'a [u8], stacks: &mut OwnedStacks) -> IResult<&'a [u8],
stacks[index].push(b)
}
index += 1;
},
)(input)
}