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use crate::tag::Tag;
use std::error;
use std::fmt;
use std::io;
use std::str;
use std::string;
pub type Result<T> = std::result::Result<T, Error>;
#[derive(Debug)]
pub enum ErrorKind {
Io(io::Error),
StringDecoding(Vec<u8>),
NoTag,
UnsupportedVersion(u8, u8),
Parsing,
InvalidInput,
UnsupportedFeature,
}
pub struct Error {
pub kind: ErrorKind,
pub description: &'static str,
pub partial_tag: Option<Tag>,
}
impl Error {
pub fn new(kind: ErrorKind, description: &'static str) -> Error {
Error {
kind,
description,
partial_tag: None,
}
}
pub(crate) fn with_tag(self, tag: Tag) -> Error {
Error {
partial_tag: Some(tag),
..self
}
}
}
impl error::Error for Error {
fn description(&self) -> &str {
#![allow(deprecated)]
if let Some(cause) = self.source() {
cause.description()
} else {
match self.kind {
ErrorKind::Io(ref err) => error::Error::description(err),
_ => self.description,
}
}
}
fn source(&self) -> Option<&(dyn error::Error + 'static)> {
match self.kind {
ErrorKind::Io(ref err) => Some(err),
_ => None,
}
}
}
impl From<io::Error> for Error {
fn from(err: io::Error) -> Error {
Error {
kind: ErrorKind::Io(err),
description: "",
partial_tag: None,
}
}
}
impl From<string::FromUtf8Error> for Error {
fn from(err: string::FromUtf8Error) -> Error {
Error {
kind: ErrorKind::StringDecoding(err.into_bytes()),
description: "data is not valid utf-8",
partial_tag: None,
}
}
}
impl From<str::Utf8Error> for Error {
fn from(_: str::Utf8Error) -> Error {
Error {
kind: ErrorKind::StringDecoding(vec![]),
description: "data is not valid utf-8",
partial_tag: None,
}
}
}
impl fmt::Debug for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
if self.description.is_empty() {
write!(f, "{:?}", self.kind)
} else {
write!(f, "{:?}: {}", self.kind, self.description)
}
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self.description.is_empty() {
true => write!(f, "{}", self.kind),
false => write!(f, "{}: {}", self.kind, self.description),
}
}
}
impl fmt::Display for ErrorKind {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
ErrorKind::Io(io_error) => write!(f, "IO: {}", io_error),
ErrorKind::StringDecoding(_) => write!(f, "StringDecoding"),
ErrorKind::NoTag => write!(f, "NoTag"),
ErrorKind::UnsupportedVersion(major, minor) => {
write!(f, "UnsupportedVersion: {}.{}", major, minor)
}
ErrorKind::Parsing => write!(f, "Parsing"),
ErrorKind::InvalidInput => write!(f, "InvalidInput"),
ErrorKind::UnsupportedFeature => write!(f, "UnsupportedFeature"),
}
}
}