pest

Struct Stack

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pub struct Stack<T: Clone> { /* private fields */ }
Expand description

Implementation of a Stack which maintains popped elements and length of previous states in order to rewind the stack to a previous state.

Implementations§

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impl<T: Clone> Stack<T>

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pub fn new() -> Self

Creates a new Stack.

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pub fn is_empty(&self) -> bool

Returns true if the stack is currently empty.

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pub fn peek(&self) -> Option<&T>

Returns the top-most &T in the Stack.

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pub fn push(&mut self, elem: T)

Pushes a T onto the Stack.

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pub fn pop(&mut self) -> Option<T>

Pops the top-most T from the Stack.

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pub fn len(&self) -> usize

Returns the size of the stack

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pub fn snapshot(&mut self)

Takes a snapshot of the current Stack.

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pub fn clear_snapshot(&mut self)

The parsing after the last snapshot was successful so clearing it.

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pub fn restore(&mut self)

Rewinds the Stack to the most recent snapshot(). If no snapshot() has been taken, this function return the stack to its initial state.

Trait Implementations§

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impl<T: Debug + Clone> Debug for Stack<T>

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

Formats the value using the given formatter. Read more
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impl<T: Clone> Default for Stack<T>

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl<T: Clone> Index<Range<usize>> for Stack<T>

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type Output = [T]

The returned type after indexing.
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fn index(&self, range: Range<usize>) -> &[T]

Performs the indexing (container[index]) operation. Read more

Auto Trait Implementations§

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impl<T> Freeze for Stack<T>

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

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

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

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

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

Blanket Implementations§

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where 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 T
where 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<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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