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use std::error::Error;
use std::borrow::Cow;
use std::result;
use std::fmt;
use serde::de;
use nom;
#[derive(Debug)]
pub enum Unexpected {
Bool(bool),
Integer(i64),
Float(f64),
Str(String),
Unit,
Seq,
Map
}
impl fmt::Display for Unexpected {
fn fmt(&self, f: &mut fmt::Formatter) -> result::Result<(), fmt::Error> {
match *self {
Unexpected::Bool(b) => write!(f, "boolean `{}`", b),
Unexpected::Integer(i) => write!(f, "integer `{}`", i),
Unexpected::Float(v) => write!(f, "floating point `{}`", v),
Unexpected::Str(ref s) => write!(f, "string {:?}", s),
Unexpected::Unit => write!(f, "unit value"),
Unexpected::Seq => write!(f, "sequence"),
Unexpected::Map => write!(f, "map"),
}
}
}
/// Represents all possible errors that can occur when working with
/// configuration.
pub enum ConfigError {
/// Configuration is frozen and no further mutations can be made.
Frozen,
/// Configuration property was not found
NotFound(String),
/// Configuration path could not be parsed.
PathParse(nom::ErrorKind),
/// Configuration could not be parsed from file.
FileParse { uri: Option<String>, cause: Box<Error> },
/// Value could not be converted into the requested type.
Type {
origin: Option<String>,
unexpected: Unexpected,
expected: &'static str,
},
/// Custom message
Message(String),
/// Unadorned error from a foreign source.
Foreign(Box<Error>),
}
impl ConfigError {
// FIXME: pub(crate)
#[doc(hidden)]
pub fn invalid_type(origin: Option<String>, unexpected: Unexpected, expected: &'static str) -> Self {
ConfigError::Type {
origin: origin,
unexpected: unexpected,
expected: expected
}
}
}
/// Alias for a `Result` with the error type set to `ConfigError`.
pub type Result<T> = result::Result<T, ConfigError>;
// Forward Debug to Display for readable panic! messages
impl fmt::Debug for ConfigError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", *self)
}
}
impl fmt::Display for ConfigError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
ConfigError::Frozen | ConfigError::PathParse(_) => {
write!(f, "{}", self.description())
}
ConfigError::Message(ref s) => {
write!(f, "{}", s)
}
ConfigError::Foreign(ref cause) => {
write!(f, "{}", cause)
}
ConfigError::NotFound(ref key) => {
write!(f, "configuration property {:?} not found", key)
}
ConfigError::Type { ref origin, ref unexpected, expected } => {
write!(f, "invalid type: {}, expected {}",
unexpected, expected)?;
if let Some(ref origin) = *origin {
write!(f, " from {}", origin)?;
}
Ok(())
}
ConfigError::FileParse { ref cause, ref uri } => {
write!(f, "{}", cause)?;
if let Some(ref uri) = *uri {
write!(f, " from {}", uri)?;
}
Ok(())
}
}
}
}
impl Error for ConfigError {
fn description(&self) -> &str {
match *self {
ConfigError::Frozen => "configuration is frozen",
ConfigError::NotFound(_) => "configuration property not found",
ConfigError::Type { .. } => "invalid type",
ConfigError::Foreign(ref cause) => cause.description(),
ConfigError::FileParse { ref cause, .. } => cause.description(),
ConfigError::PathParse(ref kind) => kind.description(),
_ => "configuration error",
}
}
fn cause(&self) -> Option<&Error> {
match *self {
ConfigError::Foreign(ref cause) => Some(cause.as_ref()),
ConfigError::FileParse { ref cause, .. } => Some(cause.as_ref()),
_ => None
}
}
}
impl de::Error for ConfigError {
fn custom<T: fmt::Display>(msg: T) -> Self {
ConfigError::Message(msg.to_string())
}
}
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