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use xml::reader; use std::fmt::{self, Display, Debug}; use std::error::Error as StdError; use serde::de::Error as SerdeError; use serde::de::Visitor; pub enum Error { Syntax(reader::Error), Custom(String) } pub type VResult<V: Visitor> = Result<V::Value, Error>; macro_rules! expect { ($actual: expr, $($expected: pat)|+ => $if_ok: expr) => { match $actual { $($expected)|+ => $if_ok, actual => Err($crate::Error::Custom(format!("Expected token {}, found {:?}", stringify!($($expected)|+), actual))) } } } #[cfg(debug_assertions)] macro_rules! debug_expect { ($actual: expr, $($expected: pat)|+ => $if_ok: expr) => { match $actual { $($expected)|+ => $if_ok, actual => panic!("Internal error: Expected token {}, found {:?}", stringify!($($expected)|+), actual) } } } #[cfg(not(debug_assertions))] macro_rules! debug_expect { ($actual: expr, $($expected: pat)|+ => $if_ok: expr) => { match $actual { $($expected)|+ => $if_ok, _ => unreachable!() } } } impl Display for Error { fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result { match *self { Error::Syntax(ref error) => Display::fmt(error, fmt), Error::Custom(ref display) => Display::fmt(display, fmt) } } } impl Debug for Error { fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result { match *self { Error::Syntax(ref error) => Debug::fmt(error, fmt), Error::Custom(ref display) => Display::fmt(display, fmt) } } } impl StdError for Error { fn description(&self) -> &str { match *self { Error::Syntax(ref error) => error.description(), Error::Custom(_) => "other error" } } fn cause(&self) -> Option<&StdError> { match *self { Error::Syntax(ref error) => Some(error), _ => None } } } impl SerdeError for Error { fn custom<T: Display>(msg: T) -> Self { Error::Custom(msg.to_string()) } }