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use std::error; use std::fmt::{self, Display}; use serde::{ser, de}; use token::Token; #[derive(Clone, PartialEq, Debug)] pub enum Error { Message(String), InvalidName(&'static str), UnexpectedToken(Token<'static>), EndOfTokens, } impl ser::Error for Error { fn custom<T: Display>(msg: T) -> Error { Error::Message(msg.to_string()) } } impl de::Error for Error { fn custom<T: Display>(msg: T) -> Error { Error::Message(msg.to_string()) } } impl fmt::Display for Error { fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { match *self { Error::Message(ref msg) => formatter.write_str(msg), Error::InvalidName(name) => write!(formatter, "invalid name `{}`", name), Error::UnexpectedToken(_) => formatter.write_str("unexpected token"), Error::EndOfTokens => formatter.write_str("end of tokens"), } } } impl error::Error for Error { fn description(&self) -> &str { match *self { Error::Message(ref msg) => msg, Error::InvalidName(_) => "invalid name", Error::UnexpectedToken(_) => "unexpected token", Error::EndOfTokens => "end of tokens", } } }