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use std::error;
use std::fmt;
use util;
#[derive(Clone, Debug)]
pub struct Error {
kind: ErrorKind,
}
impl Error {
pub(crate) fn new(kind: ErrorKind) -> Error {
Error { kind }
}
pub(crate) fn regex<E: error::Error>(err: E) -> Error {
Error { kind: ErrorKind::Regex(err.to_string()) }
}
pub fn kind(&self) -> &ErrorKind {
&self.kind
}
}
#[derive(Clone, Debug)]
pub enum ErrorKind {
Regex(String),
NotAllowed(String),
InvalidLineTerminator(u8),
#[doc(hidden)]
__Nonexhaustive,
}
impl error::Error for Error {
fn description(&self) -> &str {
match self.kind {
ErrorKind::Regex(_) => "regex error",
ErrorKind::NotAllowed(_) => "literal not allowed",
ErrorKind::InvalidLineTerminator(_) => "invalid line terminator",
ErrorKind::__Nonexhaustive => unreachable!(),
}
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self.kind {
ErrorKind::Regex(ref s) => write!(f, "{}", s),
ErrorKind::NotAllowed(ref lit) => {
write!(f, "the literal '{:?}' is not allowed in a regex", lit)
}
ErrorKind::InvalidLineTerminator(byte) => {
let x = util::show_bytes(&[byte]);
write!(f, "line terminators must be ASCII, but '{}' is not", x)
}
ErrorKind::__Nonexhaustive => unreachable!(),
}
}
}