regex_automata::dfa

Enum StartKind

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pub enum StartKind {
    Both,
    Unanchored,
    Anchored,
}
Available on crate feature dfa-search and (crate features dfa-search or dfa-onepass) only.
Expand description

The kind of anchored starting configurations to support in a DFA.

Fully compiled DFAs need to be explicitly configured as to which anchored starting configurations to support. The reason for not just supporting everything unconditionally is that it can use more resources (such as memory and build time). The downside of this is that if you try to execute a search using an Anchored mode that is not supported by the DFA, then the search will return an error.

Variants§

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Both

Support both anchored and unanchored searches.

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Unanchored

Support only unanchored searches. Requesting an anchored search will panic.

Note that even if an unanchored search is requested, the pattern itself may still be anchored. For example, ^abc will only match abc at the start of a haystack. This will remain true, even if the regex engine only supported unanchored searches.

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Anchored

Support only anchored searches. Requesting an unanchored search will panic.

Trait Implementations§

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impl Clone for StartKind

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fn clone(&self) -> StartKind

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 StartKind

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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 StartKind

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fn eq(&self, other: &StartKind) -> 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 Copy for StartKind

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impl Eq for StartKind

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impl StructuralPartialEq for StartKind

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.