1 unstable release
Uses old Rust 2015
0.1.0 | Aug 30, 2018 |
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#353 in Parser tooling
17KB
310 lines
nombine
Converters between combine and nom.
extern crate combine;
extern crate nom;
extern crate nombine;
use std::collections::HashMap;
use combine::error::ParseError;
use combine::parser::char::char;
use combine::parser::range;
use combine::stream::FullRangeStream;
use combine::{Parser, sep_by};
use nombine::{convert_from_combine, from_combine, from_nom};
fn from_hex(input: &str) -> Result<u8, std::num::ParseIntError> {
u8::from_str_radix(input, 16)
}
fn is_hex_digit(c: char) -> bool {
match c {
'0'..='9' | 'a'..='f' | 'A'..='F' => true,
_ => false,
}
}
named!(hex<&str, u8>,
map_res!(take_while_m_n!(2, 2, is_hex_digit), from_hex)
);
fn identifier<'a, I>() -> impl Parser<Input = I, Output = &'a str>
where
I: FullRangeStream<Item = char, Range = &'a str> + 'a,
// Necessary due to rust-lang/rust#24159
I::Error: ParseError<I::Item, I::Range, I::Position>,
{
range::take_while1(|c: char| c.is_alphabetic())
}
named!(field<&str, (&str, u8)>,
map!(convert_from_combine((identifier(), char('='), from_nom(hex)), |_| 0), move |(name, _, value)| (name, value))
);
fn fields<'a, I>() -> impl Parser<Input = I, Output = HashMap<&'a str, u8>>
where
I: FullRangeStream<Item = char, Range = &'a str> + 'a,
// Necessary due to rust-lang/rust#24159
I::Error: ParseError<I::Item, I::Range, I::Position>,
{
sep_by(from_nom(field), char(','))
}
// Parse using nom's interface
assert_eq!(
from_combine(fields())("fieldA=2F,fieldB=00"),
Ok((
"",
vec![
(
"fieldA",
47,
),
(
"fieldB",
0,
),
].into_iter().collect(),
))
);
// Parse using combine's interface
assert_eq!(
fields().easy_parse("fieldA=2F,fieldB=00"),
Ok((
vec![
(
"fieldA",
47,
),
(
"fieldB",
0,
),
].into_iter().collect(),
"",
))
);
Dependencies
~1.5–9.5MB
~89K SLoC