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Discover the magic of nom::combinator::value

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Bert Peters
2022-12-11 22:27:25 +01:00
parent 92db6e56c9
commit 6d9defce42
3 changed files with 6 additions and 3 deletions
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3
2022/src/day05.rs
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@@ -6,6 +6,7 @@ use nom::bytes::complete::take_until;
use nom::character::complete::newline; use nom::character::complete::newline;
use nom::combinator::map; use nom::combinator::map;
use nom::combinator::opt; use nom::combinator::opt;
use nom::combinator::value;
use nom::multi::fold_many1; use nom::multi::fold_many1;
use nom::multi::many1; use nom::multi::many1;
use nom::sequence::delimited; use nom::sequence::delimited;
@@ -31,7 +32,7 @@ fn parse_row<'a>(input: &'a [u8], stacks: &mut OwnedStacks) -> IResult<&'a [u8],
Some(v[0]) Some(v[0])
}), }),
// Or an empty stack into a None // Or an empty stack into a None
map(tag(" "), |_| None), value(None, tag(" ")),
)), )),
opt(tag(" ")), opt(tag(" ")),
)), )),

3
2022/src/day10.rs
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@@ -4,6 +4,7 @@ use nom::bytes::complete::tag;
use nom::character::complete::newline; use nom::character::complete::newline;
use nom::combinator::iterator; use nom::combinator::iterator;
use nom::combinator::map; use nom::combinator::map;
use nom::combinator::value;
use nom::sequence::preceded; use nom::sequence::preceded;
use nom::sequence::terminated; use nom::sequence::terminated;
use nom::IResult; use nom::IResult;
@@ -36,7 +37,7 @@ impl Instruction {
fn parse_instruction(input: &[u8]) -> IResult<&[u8], Instruction> { fn parse_instruction(input: &[u8]) -> IResult<&[u8], Instruction> {
terminated( terminated(
alt(( alt((
map(tag("noop"), |_| Instruction::Noop), value(Instruction::Noop, tag("noop")),
map(preceded(tag("addx "), nom::character::complete::i32), |v| { map(preceded(tag("addx "), nom::character::complete::i32), |v| {
Instruction::AddX(v) Instruction::AddX(v)
}), }),

3
2022/src/day11.rs
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@@ -6,6 +6,7 @@ use nom::character::complete::digit1;
use nom::character::complete::newline; use nom::character::complete::newline;
use nom::combinator::map; use nom::combinator::map;
use nom::combinator::map_res; use nom::combinator::map_res;
use nom::combinator::value;
use nom::multi::separated_list0; use nom::multi::separated_list0;
use nom::multi::separated_list1; use nom::multi::separated_list1;
use nom::sequence::delimited; use nom::sequence::delimited;
@@ -81,7 +82,7 @@ fn parse_operation(input: &[u8]) -> IResult<&[u8], Operation> {
_ => Err(anyhow::anyhow!("Invalid operation {op:?}")), _ => Err(anyhow::anyhow!("Invalid operation {op:?}")),
}, },
), ),
map(tag("* old"), |_| Operation::Square), value(Operation::Square, tag("* old")),
)), )),
)(input) )(input)
} }