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use winnow::error::AddContext;
use winnow::error::ErrMode;
use winnow::error::FromExternalError;
use winnow::error::ParserError;
use winnow::prelude::*;
use winnow::stream::Stream;
#[derive(Debug)]
pub enum CustomError<I> {
MyError,
Winnow(I),
External {
cause: Box<dyn std::error::Error + Send + Sync + 'static>,
input: I,
},
}
impl<I: Stream + Clone> ParserError<I> for CustomError<I> {
type Inner = Self;
fn from_input(input: &I) -> Self {
CustomError::Winnow(input.clone())
}
fn into_inner(self) -> Result<Self::Inner, Self> {
Ok(self)
}
}
impl<C, I: Stream> AddContext<I, C> for CustomError<I> {
#[inline]
fn add_context(
self,
_input: &I,
_token_start: &<I as Stream>::Checkpoint,
_context: C,
) -> Self {
self
}
}
impl<I: Stream + Clone, E: std::error::Error + Send + Sync + 'static> FromExternalError<I, E>
for CustomError<I>
{
#[inline]
fn from_external_error(input: &I, e: E) -> Self {
CustomError::External {
cause: Box::new(e),
input: input.clone(),
}
}
}
pub fn parse<'s>(_input: &mut &'s str) -> ModalResult<&'s str, CustomError<&'s str>> {
Err(ErrMode::Backtrack(CustomError::MyError))
}
fn main() {}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn it_works() {
let err = parse.parse_next(&mut "").unwrap_err();
assert!(matches!(err, ErrMode::Backtrack(CustomError::MyError)));
}
}
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