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use std::fmt;
use syntax;
#[derive(Debug)]
pub enum Error {
Syntax(syntax::Error),
CompiledTooBig(usize),
InvalidSet,
#[doc(hidden)]
__Nonexhaustive,
}
impl ::std::error::Error for Error {
fn description(&self) -> &str {
match *self {
Error::Syntax(ref err) => err.description(),
Error::CompiledTooBig(_) => "compiled program too big",
Error::InvalidSet => {
"sets must contain 2 or more regular expressions"
}
Error::__Nonexhaustive => unreachable!(),
}
}
fn cause(&self) -> Option<&::std::error::Error> {
match *self {
Error::Syntax(ref err) => Some(err),
_ => 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::InvalidSet => {
write!(f, "Sets must contain 2 or more regular expressions.")
}
Error::__Nonexhaustive => unreachable!(),
}
}
}
impl From<syntax::Error> for Error {
fn from(err: syntax::Error) -> Error {
Error::Syntax(err)
}
}