[][src]Enum nom::Err

pub enum Err<E> {
    Incomplete(Needed),
    Error(E),
    Failure(E),
}

The Err enum indicates the parser was not successful

It has three cases:

  • Incomplete indicates that more data is needed to decide. The Needed enum can contain how many additional bytes are necessary. If you are sure your parser is working on full data, you can wrap your parser with the complete combinator to transform that case in Error
  • Error means some parser did not succeed, but another one might (as an example, when testing different branches of an alt combinator)
  • Failure indicates an unrecoverable error. As an example, if you recognize a prefix to decide on the next parser to apply, and that parser fails, you know there's no need to try other parsers, you were already in the right branch, so the data is invalid

Variants

Incomplete(Needed)

There was not enough data

Error(E)

The parser had an error (recoverable)

Failure(E)

The parser had an unrecoverable error: we got to the right branch and we know other branches won't work, so backtrack as fast as possible

Implementations

impl<E> Err<E>[src]

pub fn is_incomplete(&self) -> bool[src]

Tests if the result is Incomplete

pub fn map<E2, F>(self, f: F) -> Err<E2> where
    F: FnOnce(E) -> E2, 
[src]

Applies the given function to the inner error

pub fn convert<F>(e: Err<F>) -> Self where
    E: From<F>, 
[src]

Automatically converts between errors if the underlying type supports it

impl<T> Err<(T, ErrorKind)>[src]

pub fn map_input<U, F>(self, f: F) -> Err<(U, ErrorKind)> where
    F: FnOnce(T) -> U, 
[src]

Maps Err<(T, ErrorKind)> to Err<(U, ErrorKind)> with the given F: T -> U

impl Err<(&[u8], ErrorKind)>[src]

pub fn to_owned(self) -> Err<(Vec<u8>, ErrorKind)>[src]

This is supported on crate feature alloc only.

Obtaining ownership

impl Err<(&str, ErrorKind)>[src]

pub fn to_owned(self) -> Err<(String, ErrorKind)>[src]

This is supported on crate feature alloc only.

Automatically converts between errors if the underlying type supports it

Trait Implementations

impl<E: Clone> Clone for Err<E>[src]

impl<E: Debug> Debug for Err<E>[src]

impl<E> Display for Err<E> where
    E: Debug
[src]

impl<E: Eq> Eq for Err<E>[src]

impl<E> Error for Err<E> where
    E: Debug
[src]

impl<E: PartialEq> PartialEq<Err<E>> for Err<E>[src]

impl<E> StructuralPartialEq for Err<E>[src]

Auto Trait Implementations

impl<E> RefUnwindSafe for Err<E> where
    E: RefUnwindSafe
[src]

impl<E> Send for Err<E> where
    E: Send
[src]

impl<E> Sync for Err<E> where
    E: Sync
[src]

impl<E> Unpin for Err<E> where
    E: Unpin
[src]

impl<E> UnwindSafe for Err<E> where
    E: UnwindSafe
[src]

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized
[src]

impl<T> Borrow<T> for T where
    T: ?Sized
[src]

impl<T> BorrowMut<T> for T where
    T: ?Sized
[src]

impl<T> Conv for T

impl<T> Conv for T

impl<T> FmtForward for T

impl<T> From<T> for T[src]

impl<T, U> Into<U> for T where
    U: From<T>, 
[src]

impl<T> Pipe for T where
    T: ?Sized

impl<T> Pipe for T

impl<T> PipeAsRef for T

impl<T> PipeBorrow for T

impl<T> PipeDeref for T

impl<T> PipeRef for T

impl<T> Tap for T

impl<T> Tap for T

impl<T, U> TapAsRef<U> for T where
    U: ?Sized

impl<T, U> TapBorrow<U> for T where
    U: ?Sized

impl<T> TapDeref for T

impl<T> ToOwned for T where
    T: Clone
[src]

type Owned = T

The resulting type after obtaining ownership.

impl<T> ToString for T where
    T: Display + ?Sized
[src]

impl<T> TryConv for T

impl<T> TryConv for T

impl<T, U> TryFrom<U> for T where
    U: Into<T>, 
[src]

type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 
[src]

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.