use std::fmt::{Debug, Display};
use crate::parser::Error as ParseError;
pub trait LocatedError {
fn location(&self) -> (usize, usize);
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum Error<'a, GE> {
Parse(ParseError<'a>),
Gen(GE),
}
impl<'a, GE> Display for Error<'a, GE>
where
GE: Display,
{
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
match self {
Error::Parse(pe) => {
f.write_str("parse failed: ")?;
<ParseError as Display>::fmt(pe, f)?;
}
Error::Gen(ge) => {
f.write_str("generate failed: ")?;
<GE as Display>::fmt(ge, f)?;
}
}
Ok(())
}
}
impl<'a, GE> std::error::Error for Error<'a, GE> where Self: Debug + Display {}
impl<'a, GE: LocatedError> LocatedError for Error<'a, GE> {
fn location(&self) -> (usize, usize) {
match self {
Self::Parse(e) => e.location(),
Self::Gen(e) => e.location(),
}
}
}
impl<'a, GE> From<ParseError<'a>> for Error<'a, GE> {
fn from(e: ParseError<'a>) -> Self {
Self::Parse(e)
}
}
#[cfg(test)]
mod test {
use crate::generator::helper::GeneratorInfallible;
#[test]
fn error_must_impl_std_error() {
fn is_error<E: std::error::Error>() {}
is_error::<GeneratorInfallible>();
is_error::<crate::parser::Error>();
is_error::<super::Error<'static, GeneratorInfallible>>();
}
}