55 lines
1.3 KiB
Rust
55 lines
1.3 KiB
Rust
use nom::{
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branch::alt,
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bytes::complete::tag,
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character::complete::{alpha1, alphanumeric1, char, multispace0, one_of},
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combinator::{map, recognize},
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error::ParseError,
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multi::{many0, many1},
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sequence::{delimited, pair, preceded, terminated},
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};
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use crate::parser::{IResult, Span};
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pub fn hexadecimal(input: Span) -> IResult<Span, u64> {
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map(
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preceded(
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char('h'),
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recognize(many1(terminated(
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one_of("0123456789abcdefABCDEF"),
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many0(char('_')),
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))),
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),
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|out: Span| {
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u64::from_str_radix(&str::replace(out.fragment(), "_", ""), 16)
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.expect("error parsing literal")
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},
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)(input)
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}
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pub fn ws0<'a, F: 'a, O, E: ParseError<Span<'a>>>(
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inner: F,
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) -> impl FnMut(Span<'a>) -> IResult<Span<'a>, O, E>
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where
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F: FnMut(Span<'a>) -> IResult<Span<'a>, O, E>,
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{
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delimited(multispace0, inner, multispace0)
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}
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pub fn identifier(input: Span) -> IResult<Span, Span> {
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recognize(pair(
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alt((alpha1, tag("_"))),
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many0(alt((alphanumeric1, tag("_")))),
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))(input)
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}
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#[cfg(test)]
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mod test {
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use super::*;
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#[test]
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fn test_hex() {
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assert_eq!(hexadecimal("hfF".into()).unwrap().1, 0xff);
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assert_eq!(hexadecimal("hF".into()).unwrap().1, 0xf);
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}
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}
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