Struct regex_automata::HalfMatch

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pub struct HalfMatch { /* private fields */ }
Expand description

A representation of “half” of a match reported by a DFA.

This is called a “half” match because it only includes the end location (or start location for a reverse search) of a match. This corresponds to the information that a single DFA scan can report. Getting the other half of the match requires a second scan with a reversed DFA.

A half match also includes the pattern that matched. The pattern is identified by an ID, which corresponds to its position (starting from 0) relative to other patterns used to construct the corresponding DFA. If only a single pattern is provided to the DFA, then all matches are guaranteed to have a pattern ID of 0.

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impl HalfMatch

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pub fn new(pattern: PatternID, offset: usize) -> HalfMatch

Create a new half match from a pattern ID and a byte offset.

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pub fn must(pattern: usize, offset: usize) -> HalfMatch

Create a new half match from a pattern ID and a byte offset.

This is like HalfMatch::new, but accepts a usize instead of a PatternID. This panics if the given usize is not representable as a PatternID.

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pub fn pattern(&self) -> PatternID

Returns the ID of the pattern that matched.

The ID of a pattern is derived from the position in which it was originally inserted into the corresponding DFA. The first pattern has identifier 0, and each subsequent pattern is 1, 2 and so on.

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pub fn offset(&self) -> usize

The position of the match.

If this match was produced by a forward search, then the offset is exclusive. If this match was produced by a reverse search, then the offset is inclusive.

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impl Clone for HalfMatch

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fn clone(&self) -> HalfMatch

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 HalfMatch

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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 Hash for HalfMatch

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fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl PartialEq for HalfMatch

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

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impl Eq for HalfMatch

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impl StructuralPartialEq for HalfMatch

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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default 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> CloneToUninit for T
where T: Copy,

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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.