42 lines
945 B
Rust
42 lines
945 B
Rust
use std::ops::ControlFlow;
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use nom::{
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error::{ErrorKind, ParseError},
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Err, InputLength, Parser,
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};
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pub fn fold_till<I, O, E, St, P, F, G>(
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mut p: P,
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mut init: F,
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mut acc: G,
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) -> impl FnMut(I) -> nom::IResult<I, St, E>
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where
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I: InputLength,
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E: ParseError<I>,
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P: Parser<I, O, E>,
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F: FnMut() -> St,
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G: FnMut(St, O) -> ControlFlow<St, St>,
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{
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move |i| {
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let mut res = init();
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let mut input = i;
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loop {
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let len = input.input_len();
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let (i, o) = p.parse(input)?;
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if i.input_len() == len {
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return Err(Err::Error(E::from_error_kind(i, ErrorKind::Many0)));
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}
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match acc(res, o) {
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ControlFlow::Continue(next) => {
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res = next;
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input = i;
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}
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ControlFlow::Break(res) => return Ok((i, res)),
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}
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}
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}
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}
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