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use crate::{
gen_parser::GenParserRequirement,
Error,
};
use either::{
Either,
Left,
Right,
};
use std::fmt::{
Debug,
Display,
Formatter,
Result as FmtResult,
};
#[derive(Debug)]
pub struct GenParserError<'a, 'b, R1, R2, E1, E2>
where
R1: Debug + Display,
R2: Debug + Display,
E1: Error<'a, 'b>,
E2: Error<'a, 'b>,
{
from: usize,
requirement: GenParserRequirement<'a, 'b, R1, R2>,
cause: Either<E1, E2>,
}
impl<'a, 'b, R1, R2, E1, E2> GenParserError<'a, 'b, R1, R2, E1, E2>
where
R1: Debug + Display,
R2: Debug + Display,
E1: Error<'a, 'b>,
E2: Error<'a, 'b>,
{
pub fn new(
from: usize,
requirement: GenParserRequirement<'a, 'b, R1, R2>,
cause: Either<E1, E2>,
) -> Self
{
Self {
from,
requirement,
cause,
}
}
}
impl<'a, 'b, R1, R2, E1, E2> Error<'a, 'b> for GenParserError<'a, 'b, R1, R2, E1, E2>
where
R1: Debug + Display,
R2: Debug + Display,
E1: Error<'a, 'b>,
E2: Error<'a, 'b>,
{
fn from(&self, f: &mut Formatter) -> FmtResult
{
write!(f, "{}", self.from)
}
fn requirement(&self, f: &mut Formatter) -> FmtResult
{
write!(f, "{}", self.requirement)
}
fn result(&self, f: &mut Formatter) -> FmtResult
{
match &self.cause
{
Left(_) => write!(f, "failed to parse {}", self.requirement.first()),
Right(_) => write!(f, "failed to parse {}", self.requirement.second().unwrap()),
}
}
fn causes(&self, f: &mut Formatter, depth: usize) -> FmtResult
{
match &self.cause
{
Left(err) => err.print(f, depth),
Right(err) => err.print(f, depth),
}
}
fn print(&self, f: &mut Formatter, depth: usize) -> FmtResult
{
for _ in 0..depth
{
write!(f, "\t")?;
}
write!(f, "at position ")?;
self.from(f)?;
write!(f, " required ")?;
self.requirement(f)?;
write!(f, " but ")?;
self.result(f)?;
write!(f, ".\n")?;
self.causes(f, depth + 1)
}
fn print_full(&self, f: &mut Formatter, depth: usize) -> FmtResult
{
self.print(f, depth)
}
}
impl<'a, 'b, R1, R2, E1, E2> Display for GenParserError<'a, 'b, R1, R2, E1, E2>
where
R1: Debug + Display,
R2: Debug + Display,
E1: Error<'a, 'b>,
E2: Error<'a, 'b>,
{
fn fmt(&self, f: &mut Formatter) -> FmtResult
{
self.print(f, 0)
}
}