/
lexer_error.rs
100 lines (82 loc) · 2.74 KB
/
lexer_error.rs
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// Copyright 2015-2020 Benjamin Fry <benjaminfry@me.com>
//
// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
// http://opensource.org/licenses/MIT>, at your option. This file may not be
// copied, modified, or distributed except according to those terms.
//! Lexer error types for the crate
use std::fmt;
use thiserror::Error;
#[cfg(feature = "backtrace")]
use crate::proto::{trace, ExtBacktrace};
/// An alias for lexer results returned by functions of this crate
pub type Result<T> = ::std::result::Result<T, Error>;
/// The error kind for lexer errors that get returned in the crate
#[derive(Eq, PartialEq, Debug, Error, Clone)]
pub enum ErrorKind {
/// Unexpected end of input
#[error("unexpected end of input")]
EOF,
/// An illegal character was found
#[error("illegal character input: {0}")]
IllegalCharacter(char),
/// An illegal state was reached
#[error("illegal state: {0}")]
IllegalState(&'static str),
/// An error with an arbitrary message, referenced as &'static str
#[error("{0}")]
Message(&'static str),
/// An unclosed list was found
#[error("unclosed list, missing ')'")]
UnclosedList,
/// An unclosed quoted string was found
#[error("unclosed quoted string")]
UnclosedQuotedString,
/// An unrecognized character was found
#[error("unrecognized character input: {0}")]
UnrecognizedChar(char),
/// An unrecognized dollar content was found
#[error("unrecognized dollar content: {0}")]
UnrecognizedDollar(String),
/// An unrecognized octet was found
#[error("unrecognized octet: {0:x}")]
UnrecognizedOctet(u32),
}
/// The error type for lexer errors that get returned in the crate
#[derive(Clone, Error, Debug)]
pub struct Error {
kind: ErrorKind,
#[cfg(feature = "backtrace")]
backtrack: Option<ExtBacktrace>,
}
impl Error {
/// Get the kind of the error
pub fn kind(&self) -> &ErrorKind {
&self.kind
}
}
impl From<ErrorKind> for Error {
fn from(kind: ErrorKind) -> Error {
Error {
kind,
#[cfg(feature = "backtrace")]
backtrack: trace!(),
}
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
cfg_if::cfg_if! {
if #[cfg(feature = "backtrace")] {
if let Some(ref backtrace) = self.backtrack {
fmt::Display::fmt(&self.kind, f)?;
fmt::Debug::fmt(backtrace, f)
} else {
fmt::Display::fmt(&self.kind, f)
}
} else {
fmt::Display::fmt(&self.kind, f)
}
}
}
}