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// Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.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.
use std::fmt;
use syntax;
/// An error that occurred during parsing or compiling a regular expression.
#[derive(Clone, Debug, PartialEq)]
pub enum Error {
/// A syntax error.
Syntax(String),
/// The compiled program exceeded the set size limit.
/// The argument is the size limit imposed.
CompiledTooBig(usize),
/// Hints that destructuring should not be exhaustive.
///
/// This enum may grow additional variants, so this makes sure clients
/// don't count on exhaustive matching. (Otherwise, adding a new variant
/// could break existing code.)
#[doc(hidden)]
__Nonexhaustive,
}
impl ::std::error::Error for Error {
fn description(&self) -> &str {
match *self {
Error::Syntax(ref err) => err,
Error::CompiledTooBig(_) => "compiled program too big",
Error::__Nonexhaustive => unreachable!(),
}
}
fn cause(&self) -> Option<&::std::error::Error> {
None
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
Error::Syntax(ref err) => err.fmt(f),
Error::CompiledTooBig(limit) => {
write!(f, "Compiled regex exceeds size limit of {} bytes.",
limit)
}
Error::__Nonexhaustive => unreachable!(),
}
}
}
impl From<syntax::Error> for Error {
fn from(err: syntax::Error) -> Error {
Error::Syntax(err.to_string())
}
}