Struct aho_corasick::Span

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pub struct Span {
    pub start: usize,
    pub end: usize,
}
Expand description

A representation of a range in a haystack.

A span corresponds to the starting and ending byte offsets of a contiguous region of bytes. The starting offset is inclusive while the ending offset is exclusive. That is, a span is a half-open interval.

A span is used to report the offsets of a match, but it is also used to convey which region of a haystack should be searched via routines like Input::span.

This is basically equivalent to a std::ops::Range<usize>, except this type implements Copy which makes it more ergonomic to use in the context of this crate. Indeed, Span exists only because Range<usize> does not implement Copy. Like a range, this implements Index for [u8] and str, and IndexMut for [u8]. For convenience, this also impls From<Range>, which means things like Span::from(5..10) work.

There are no constraints on the values of a span. It is, for example, legal to create a span where start > end.

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§start: usize

The start offset of the span, inclusive.

§end: usize

The end offset of the span, exclusive.

Implementations§

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impl Span

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pub fn range(&self) -> Range<usize>

Returns this span as a range.

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pub fn is_empty(&self) -> bool

Returns true when this span is empty. That is, when start >= end.

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pub fn len(&self) -> usize

Returns the length of this span.

This returns 0 in precisely the cases that is_empty returns true.

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pub fn contains(&self, offset: usize) -> bool

Returns true when the given offset is contained within this span.

Note that an empty span contains no offsets and will always return false.

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pub fn offset(&self, offset: usize) -> Span

Returns a new span with offset added to this span’s start and end values.

Trait Implementations§

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impl Clone for Span

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fn clone(&self) -> Span

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 Span

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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 From<Range<usize>> for Span

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fn from(range: Range<usize>) -> Span

Converts to this type from the input type.
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impl From<Span> for Range<usize>

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fn from(span: Span) -> Range<usize>

Converts to this type from the input type.
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impl Hash for Span

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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 Index<Span> for [u8]

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type Output = [u8]

The returned type after indexing.
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fn index(&self, index: Span) -> &[u8]

Performs the indexing (container[index]) operation. Read more
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impl Index<Span> for str

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type Output = str

The returned type after indexing.
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fn index(&self, index: Span) -> &str

Performs the indexing (container[index]) operation. Read more
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impl IndexMut<Span> for [u8]

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fn index_mut(&mut self, index: Span) -> &mut [u8]

Performs the mutable indexing (container[index]) operation. Read more
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impl PartialEq<Range<usize>> for Span

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fn eq(&self, range: &Range<usize>) -> 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 PartialEq<Span> for Range<usize>

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fn eq(&self, span: &Span) -> 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 PartialEq for Span

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fn eq(&self, other: &Span) -> 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 Span

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impl Eq for Span

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impl StructuralPartialEq for Span

Auto Trait Implementations§

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impl Freeze for Span

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impl RefUnwindSafe for Span

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impl Send for Span

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impl Sync for Span

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impl Unpin for Span

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impl UnwindSafe for Span

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: 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> 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> 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.