RollbackState

chumsky::inspector

Struct RollbackState

pub struct RollbackState<T>(pub T);

Expand description

A state type that clones and rolls back its contents during a rewind.

This might be useful if you want to use the parser state to, say, count the parsed occurrences of a particular construct.

Ideally, you should try to have the Clone implementation be fairly cheap.

Tuple Fields§

§0: T

Trait Implementations§

impl<T: Clone> Clone for RollbackState<T>

fn clone(&self) -> RollbackState<T>

Returns a duplicate of the value. Read more

1.0.0§

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

Performs copy-assignment from source. Read more

impl<T: Debug> Debug for RollbackState<T>

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

Formats the value using the given formatter. Read more

impl<T: Default> Default for RollbackState<T>

fn default() -> RollbackState<T>

Returns the “default value” for a type. Read more

impl<T> Deref for RollbackState<T>

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl<T> DerefMut for RollbackState<T>

fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.

impl<T> From<T> for RollbackState<T>

fn from(value: T) -> Self

Converts to this type from the input type.

impl<'src, T: Clone, I: Input<'src>> Inspector<'src, I> for RollbackState<T>

type Checkpoint = T

A type the Inspector can use to revert to a previous state. Read more

fn on_token(&mut self, _: &<I as Input<'src>>::Token)

This function is called when a new token is read from the input stream.

fn on_save<'parse>(&self, _: &Cursor<'src, 'parse, I>) -> Self::Checkpoint

This function is called when a combinator saves the current state of the parse.

fn on_rewind<'parse>( &mut self, cp: &Checkpoint<'src, 'parse, I, Self::Checkpoint>, )

This function is called when a combinator rewinds to an earlier state of the parser. Read more

impl<T: Copy> Copy for RollbackState<T>

Auto Trait Implementations§

impl<T> Freeze for RollbackState<T>
where T: Freeze,

impl<T> RefUnwindSafe for RollbackState<T>
where T: RefUnwindSafe,

impl<T> Send for RollbackState<T>
where T: Send,

impl<T> Sync for RollbackState<T>
where T: Sync,

impl<T> Unpin for RollbackState<T>
where T: Unpin,

impl<T> UnwindSafe for RollbackState<T>
where T: UnwindSafe,

Blanket Implementations§

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

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

impl<T> BorrowMut<T> for T
where T: ?Sized,

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

Mutably borrows from an owned value. Read more

impl<T> CloneToUninit for T
where T: Clone,

unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)

Performs copy-assignment from self to dest. Read more

impl<T> From<!> for T

fn from(t: !) -> T

Converts to this type from the input type.

impl<T> From<T> for T

fn from(t: T) -> T

Returns the argument unchanged.

impl<T, U> Into<U> for T
where U: From<T>,

fn into(self) -> U

Calls U::from(self).

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

impl<T> IntoEither for T

fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

impl<'src, T> IntoMaybe<'src, T> for T
where T: 'src,

type Proj<U: 'src> = U

fn map_maybe<R>( self, _f: impl FnOnce(&'src T) -> &'src R, g: impl FnOnce(T) -> R, ) -> <T as IntoMaybe<'src, T>>::Proj<R>
where R: 'src,

impl<P, T> Receiver for P
where P: Deref<Target = T> + ?Sized, T: ?Sized,

type Target = T

🔬This is a nightly-only experimental API. (arbitrary_self_types)

The target type on which the method may be called.

impl<'p, T> Seq<'p, T> for T
where T: Clone,

type Item<'a> = &'a T where T: 'a

The item yielded by the iterator.

type Iter<'a> = Once<&'a T> where T: 'a

An iterator over the items within this container, by reference.

fn seq_iter(&self) -> <T as Seq<'p, T>>::Iter<'_>

Iterate over the elements of the container.

fn contains(&self, val: &T) -> bool
where T: PartialEq,

Check whether an item is contained within this sequence.

fn to_maybe_ref<'b>(item: <T as Seq<'p, T>>::Item<'b>) -> Maybe<T, &'p T>
where 'p: 'b,

Convert an item of the sequence into a MaybeRef.

impl<'p, T> Seq<'p, T> for T
where T: Clone + Debug,

type Item<'a>: Borrow<T> where Self: 'a

The item yielded by the iterator.

type Iter<'a>: Iterator<Item = Self::Item<'a>> where Self: 'a

An iterator over the items within this container, by reference.

fn seq_iter(&self) -> Self::Iter<'_>

Iterate over the elements of the container.

fn contains(&self, val: &T) -> bool
where T: PartialEq,

Check whether an item is contained within this sequence.

fn to_maybe_ref<'b>(item: Self::Item<'b>) -> MaybeRef<'p, T>
where 'p: 'b,

Convert an item of the sequence into a MaybeRef.

impl<T, S> SpanWrap<S> for T
where S: WrappingSpan<T>,

fn with_span(self, span: S) -> S::Spanned

Invokes WrappingSpan::make_wrapped to wrap an AST node in a span.

impl<T> ToOwned for T
where T: Clone,

type Owned = T

The resulting type after obtaining ownership.

fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more

fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more

impl<T, U> TryFrom<U> for T
where U: Into<T>,

type Error = Infallible

The type returned in the event of a conversion error.

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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

The type returned in the event of a conversion error.

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.

impl<T> OrderedSeq<'_, T> for T
where T: Clone,