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