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

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

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Incomplete(Needed)

There was not enough data

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Error(E)

The parser had an error (recoverable)

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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§

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impl<E> Err<E>

pub fn is_incomplete(&self) -> bool

Tests if the result is Incomplete

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

Applies the given function to the inner error

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

Automatically converts between errors if the underlying type supports it

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impl<T> Err<(T, ErrorKind)>

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

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

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impl<T> Err<Error<T>>

pub fn map_input<U, F>(self, f: F) -> Err<Error<U>>where F: FnOnce(T) -> U,

Maps Err<error::Error<T>> to Err<error::Error<U>> with the given F: T -> U

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

pub fn to_owned(self) -> Err<(Vec<u8, Global>, ErrorKind)>

Obtaining ownership

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impl Err<(&str, ErrorKind)>

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

Obtaining ownership

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impl Err<Error<&[u8]>>

pub fn to_owned(self) -> Err<Error<Vec<u8, Global>>>

Obtaining ownership

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impl Err<Error<&str>>

pub fn to_owned(self) -> Err<Error<String>>

Obtaining ownership

Trait Implementations§

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impl<E> Clone for Err<E>where E: Clone,

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fn clone(&self) -> Err<E>

Returns a copy of the value. Read more
1.0.0 · source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<E> Debug for Err<E>where E: Debug,

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more
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impl<E> Display for Err<E>where E: Debug,

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more
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impl<E> Error for Err<E>where E: Debug,

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fn source(&self) -> Option<&(dyn Error + 'static)>

The lower-level source of this error, if any. Read more
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fn description(&self) -> &str

👎Deprecated since 1.42.0: use the Display impl or to_string()
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fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting
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fn provide<'a>(&'a self, demand: &mut Demand<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)
Provides type based access to context intended for error reports. Read more
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impl From<Err<Error>> for X509Error

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fn from(e: Err<Error>) -> X509Error

Converts to this type from the input type.
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impl From<Err<X509Error>> for X509Error

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fn from(e: Err<X509Error>) -> X509Error

Converts to this type from the input type.
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impl From<Error> for Err<Error>

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fn from(e: Error) -> Err<Error>

Converts to this type from the input type.
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impl From<X509Error> for Err<X509Error>

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fn from(e: X509Error) -> Err<X509Error>

Converts to this type from the input type.
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impl<E> PartialEq<Err<E>> for Err<E>where E: PartialEq<E>,

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fn eq(&self, other: &Err<E>) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<E> Eq for Err<E>where E: Eq,

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impl<E> StructuralPartialEq for Err<E>

Auto Trait Implementations§

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impl<E> RefUnwindSafe for Err<E>where E: RefUnwindSafe,

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impl<E> Send for Err<E>where E: Send,

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impl<E> Sync for Err<E>where E: Sync,

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impl<E> Unpin for Err<E>where E: Unpin,

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impl<E> UnwindSafe for Err<E>where E: UnwindSafe,

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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<'a, T, E> AsTaggedExplicit<'a, E> for Twhere T: 'a,

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fn explicit(self, class: Class, tag: u32) -> TaggedParser<'a, Explicit, Self, E>

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impl<'a, T, E> AsTaggedImplicit<'a, E> for Twhere T: 'a,

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fn implicit( self, class: Class, constructed: bool, tag: u32 ) -> TaggedParser<'a, Implicit, Self, E>

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impl<T> Borrow<T> for Twhere T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<Q, K> Equivalent<K> for Qwhere Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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impl<Q, K> Equivalent<K> for Qwhere Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<Q, K> Equivalent<K> for Qwhere Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<E> Provider for Ewhere E: Error + ?Sized,

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fn provide<'a>(&'a self, demand: &mut Demand<'a>)

🔬This is a nightly-only experimental API. (provide_any)
Data providers should implement this method to provide all values they are able to provide by using demand. Read more
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impl<T> Same<T> for T

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type Output = T

Should always be Self
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impl<T> ToOwned for Twhere T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T> ToString for Twhere T: Display + ?Sized,

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default fn to_string(&self) -> String

Converts the given value to a String. Read more
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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<V, T> VZip<V> for Twhere V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<T> AnyError for Twhere T: Error + Send + Sync + 'static,

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impl<T> CacheError for Twhere T: Error + Send + Sync + 'static,