Enum `HirKind`

pub enum HirKind

The underlying kind of an arbitrary Hir expression.

An HirKind is principally useful for doing case analysis on the type of a regular expression. If you're looking to build new Hir values, then you must use the smart constructors defined on Hir, like Hir::repetition, to build new Hir values. The API intentionally does not expose any way of building an Hir directly from an HirKind.

Variants

Empty

The empty regular expression, which matches everything, including the empty string.

Literal(Literal)

A literal string that matches exactly these bytes.

Class(Class)

A single character class that matches any of the characters in the class. A class can either consist of Unicode scalar values as characters, or it can use bytes.

A class may be empty. In which case, it matches nothing.

Look(Look)

A look-around assertion. A look-around match always has zero length.

Repetition(Repetition)

A repetition operation applied to a sub-expression.

Capture(Capture)

A capturing group, which contains a sub-expression.

Concat(Vec<Hir>)

A concatenation of expressions.

A concatenation matches only if each of its sub-expressions match one after the other.

Concatenations are guaranteed by Hir's smart constructors to always have at least two sub-expressions.

Alternation(Vec<Hir>)

An alternation of expressions.

An alternation matches only if at least one of its sub-expressions match. If multiple sub-expressions match, then the leftmost is preferred.

Alternations are guaranteed by Hir's smart constructors to always have at least two sub-expressions.

Implementations

`impl HirKind`

fn subs(&self) -> &[Hir]: Returns a slice of this kind's sub-expressions, if any.

Trait Implementations

`impl Clone for HirKind`

fn clone(&self) -> Self

`impl Debug for HirKind`

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

`impl Eq for HirKind`

`impl PartialEq for HirKind`

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

`impl StructuralPartialEq for HirKind`

Auto Trait Implementations

`impl Freeze for HirKind`

`impl RefUnwindSafe for HirKind`

`impl Send for HirKind`

`impl Sync for HirKind`

`impl Unpin for HirKind`

`impl UnsafeUnpin for HirKind`

`impl UnwindSafe for HirKind`

Blanket Implementations

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

fn type_id(&self) -> TypeId

`impl<T> Borrow<T> for HirKind where T: ?Sized,`

fn borrow(&self) -> &T

`impl<T> BorrowMut<T> for HirKind where T: ?Sized,`

fn borrow_mut(&mut self) -> &mut T

`impl<T> CloneToUninit for HirKind where T: Clone,`

unsafe fn clone_to_uninit(&self, dest: *mut u8)

`impl<T> From<T> for HirKind`

fn from(t: T) -> T: Returns the argument unchanged.

`impl<T> ToOwned for HirKind where T: Clone,`

type Owned = T;
fn to_owned(&self) -> T
fn clone_into(&self, target: &mut T)

`impl<T, U> Into for HirKind where U: From<T>,`

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of [From]<T> for U chooses to do.

`impl<T, U> TryFrom for HirKind where U: Into<T>,`

type Error = never;
fn try_from(value: U) -> Result<T, never>

`impl<T, U> TryInto for HirKind where U: TryFrom<T>,`

type Error = >::Error;
fn try_into(self) -> Result<U, >::Error>