Macro nom::fix_error [−][src]
macro_rules! fix_error { ($i:expr, $t:ty, $submac:ident!( $($args:tt)* )) => { ... }; ($i:expr, $t:ty, $f:expr) => { ... }; }
translate parser result from IResult<I,O,u32> to IResult<I,O,E> with a custom type
#[derive(Debug,Clone,PartialEq)] pub struct ErrorStr(String); // Convert to IResult<&[u8], &[u8], ErrorStr> impl From<u32> for ErrorStr { fn from(i: u32) -> Self { ErrorStr(format!("custom error code: {}", i)) } } // will add a Custom(42) error to the error chain named!(err_test, add_return_error!(ErrorKind::Custom(42), tag!("abcd"))); // Convert to IResult<&[u8], &[u8], ErrorStr> named!(parser<&[u8], &[u8], ErrorStr>, fix_error!(ErrorStr, err_test)); let a = &b"efghblah"[..]; //assert_eq!(parser(a), Err(Err::Error(Context::Code(a, ErrorKind::Custom(ErrorStr("custom error code: 42".to_string())))))); let list = vec!((a, ErrorKind::Tag), (a, ErrorKind::Custom(ErrorStr("custom error code: 42".to_string())))); assert_eq!( parser(a), Err(Err::Error(Context::List(list))) );