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use std::error::Error as StdError;
use std::fmt::{self, Debug, Display};
use std::io;
use serde::de::Visitor;
use serde::ser::{Serialize, Serializer};
use serde::{Deserialize, Deserializer};
pub type Result<T> = std::result::Result<T, Error>;
#[derive(Debug)]
#[non_exhaustive]
pub enum Error {
E(String),
}
impl Display for Error {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Error::E(error) => write!(f, "{}", error),
}
}
}
impl StdError for Error {}
impl From<io::Error> for Error {
#[inline]
fn from(err: io::Error) -> Self {
Error::from(err.to_string())
}
}
impl From<&str> for Error {
fn from(arg: &str) -> Self {
return Error::E(arg.to_string());
}
}
impl From<std::string::String> for Error {
fn from(arg: String) -> Self {
return Error::E(arg);
}
}
impl From<&dyn std::error::Error> for Error {
fn from(arg: &dyn std::error::Error) -> Self {
return Error::E(arg.to_string());
}
}
impl Clone for Error {
fn clone(&self) -> Self {
Error::from(self.to_string())
}
fn clone_from(&mut self, source: &Self) {
*self = Self::from(source.to_string());
}
}
impl Serialize for Error {
fn serialize<S>(&self, serializer: S) -> std::result::Result<S::Ok, S::Error>
where
S: Serializer,
{
serializer.serialize_str(self.to_string().as_str())
}
}
struct ErrorVisitor;
impl<'de> Visitor<'de> for ErrorVisitor {
type Value = String;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("a string")
}
fn visit_string<E>(self, v: String) -> std::result::Result<Self::Value, E>
where
E: std::error::Error,
{
Ok(v)
}
fn visit_str<E>(self, v: &str) -> std::result::Result<Self::Value, E>
where
E: std::error::Error,
{
Ok(v.to_string())
}
}
impl<'de> Deserialize<'de> for Error {
fn deserialize<D>(deserializer: D) -> std::result::Result<Self, D::Error>
where
D: Deserializer<'de>,
{
let r = deserializer.deserialize_string(ErrorVisitor)?;
return Ok(Error::from(r));
}
}
pub trait OptionToResult<T> {
fn to_result(self, error_str: &str) -> Result<T>;
}
impl<T> OptionToResult<T> for Option<T> {
fn to_result(self, error_str: &str) -> Result<T> {
if self.is_some() {
Ok(self.unwrap())
} else {
Err(Error::from(error_str))
}
}
}