regex_automata::nfa::thompson

Struct DenseTransitions

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pub struct DenseTransitions {
    pub transitions: Box<[StateID]>,
}
Available on crate feature nfa-thompson only.
Expand description

A sequence of transitions used to represent a dense state.

This is the primary representation of a Dense state. It provides constant time matching. That is, given a byte in a haystack and a DenseTransitions, one can determine if the state matches in constant time.

This is in contrast to SparseTransitions, whose time complexity is necessarily bigger than constant time. Also in contrast, DenseTransitions usually requires (much) more heap memory.

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§transitions: Box<[StateID]>

A dense representation of this state’s transitions on the heap. This always has length 256.

Implementations§

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impl DenseTransitions

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pub fn matches(&self, haystack: &[u8], at: usize) -> Option<StateID>

This follows the matching transition for a particular byte.

The matching transition is found by looking for a transition that doesn’t correspond to StateID::ZERO for the byte at the given position in haystack.

If at >= haystack.len(), then this returns None.

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pub fn matches_byte(&self, byte: u8) -> Option<StateID>

This follows the matching transition for a particular byte.

The matching transition is found by looking for a transition that doesn’t correspond to StateID::ZERO for the given byte.

If at >= haystack.len(), then this returns None.

Trait Implementations§

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impl Clone for DenseTransitions

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fn clone(&self) -> DenseTransitions

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for DenseTransitions

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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 PartialEq for DenseTransitions

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fn eq(&self, other: &DenseTransitions) -> bool

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl Eq for DenseTransitions

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impl StructuralPartialEq for DenseTransitions

Auto Trait Implementations§

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> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. 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> ToOwned for T
where 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, 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.