use std::error;
use std::fmt;
use std::io;
use byteorder;
use regex_syntax;
use raw;
use {LevenshteinError, RegexError};
pub type Result<T> = ::std::result::Result<T, Error>;
#[derive(Debug)]
pub enum Error {
Fst(raw::Error),
Regex(RegexError),
Levenshtein(LevenshteinError),
Io(io::Error),
}
impl From<io::Error> for Error {
fn from(err: io::Error) -> Error {
Error::Io(err)
}
}
impl From<RegexError> for Error {
fn from(err: RegexError) -> Error {
Error::Regex(err)
}
}
impl From<LevenshteinError> for Error {
fn from(err: LevenshteinError) -> Error {
Error::Levenshtein(err)
}
}
impl From<raw::Error> for Error {
fn from(err: raw::Error) -> Error {
Error::Fst(err)
}
}
impl From<regex_syntax::Error> for Error {
fn from(err: regex_syntax::Error) -> Error {
Error::Regex(RegexError::Syntax(err))
}
}
impl From<byteorder::Error> for Error {
fn from(err: byteorder::Error) -> Error {
Error::Io(From::from(err))
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
use self::Error::*;
match *self {
Fst(ref err) => err.fmt(f),
Regex(ref err) => err.fmt(f),
Levenshtein(ref err) => err.fmt(f),
Io(ref err) => err.fmt(f),
}
}
}
impl error::Error for Error {
fn description(&self) -> &str {
use self::Error::*;
match *self {
Fst(ref err) => err.description(),
Regex(ref err) => err.description(),
Levenshtein(ref err) => err.description(),
Io(ref err) => err.description(),
}
}
fn cause(&self) -> Option<&error::Error> {
use self::Error::*;
match *self {
Fst(ref err) => Some(err),
Regex(ref err) => Some(err),
Levenshtein(ref err) => Some(err),
Io(ref err) => Some(err),
}
}
}