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// Copyright (c) 2018-2019, The Tor Project, Inc.
// Copyright (c) 2018, isis agora lovecruft
// See LICENSE for licensing information
//! Various errors which may occur during protocol version parsing.
use std::fmt;
use std::fmt::Display;
/// All errors which may occur during protover parsing routines.
#[derive(Clone, Copy, Debug, Eq, PartialEq, Hash)]
#[allow(missing_docs)] // See Display impl for error descriptions
pub enum ProtoverError {
Overlap,
LowGreaterThanHigh,
Unparseable,
ExceedsMax,
ExceedsExpansionLimit,
UnknownProtocol,
ExceedsNameLimit,
InvalidProtocol,
}
/// Descriptive error messages for `ProtoverError` variants.
impl Display for ProtoverError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
ProtoverError::Overlap => write!(
f,
"Two or more (low, high) protover ranges would overlap once expanded."
),
ProtoverError::LowGreaterThanHigh => write!(
f,
"The low in a (low, high) protover range was greater than high."
),
ProtoverError::Unparseable => write!(f, "The protover string was unparseable."),
ProtoverError::ExceedsMax => write!(
f,
"The high in a (low, high) protover range exceeds 63."
),
ProtoverError::ExceedsExpansionLimit => write!(
f,
"The protover string would exceed the maximum expansion limit."
),
ProtoverError::UnknownProtocol => write!(
f,
"A protocol in the protover string we attempted to parse is unknown."
),
ProtoverError::ExceedsNameLimit => {
write!(f, "An unrecognised protocol name was too long.")
}
ProtoverError::InvalidProtocol => {
write!(f, "A protocol name includes invalid characters.")
}
}
}
}
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