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use std::error; use std::fmt; use regex_syntax; #[derive(Debug)] pub enum Error { Syntax(regex_syntax::Error), CompiledTooBig(usize), NoLazy, NoWordBoundary, NoEmpty, } impl From<regex_syntax::Error> for Error { fn from(err: regex_syntax::Error) -> Error { Error::Syntax(err) } } impl fmt::Display for Error { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { use self::Error::*; match *self { Syntax(ref err) => err.fmt(f), CompiledTooBig(size_limit) => { write!(f, "Compiled regex exceeds size limit of {} bytes", size_limit) } NoLazy => write!(f, "Lazy reptition operators such as '+?' are \ not allowed."), NoWordBoundary => write!(f, "Word boundary operators are not \ allowed."), NoEmpty => write!(f, "Empty match operators are not allowed \ (hopefully temporary)."), } } } impl error::Error for Error { fn description(&self) -> &str { use self::Error::*; match *self { Syntax(ref err) => err.description(), CompiledTooBig(_) => "compiled regex is too big", NoLazy => "lazy repetition operators are not allowed", NoWordBoundary => "word boundary operators are not allowed", NoEmpty => "empty match operators are not allowed", } } fn cause(&self) -> Option<&error::Error> { use self::Error::*; match *self { Syntax(ref err) => Some(err), _ => None, } } }