regex_syntax::hir

Enum HirKind

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pub enum HirKind {
    Empty,
    Literal(Literal),
    Class(Class),
    Look(Look),
    Repetition(Repetition),
    Capture(Capture),
    Concat(Vec<Hir>),
    Alternation(Vec<Hir>),
}
Expand description

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§

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Empty

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

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Literal(Literal)

A literalstring that matches exactly these bytes.

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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.

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Look(Look)

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

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Repetition(Repetition)

A repetition operation applied to a sub-expression.

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Capture(Capture)

A capturing group, which contains a sub-expression.

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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.

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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.

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impl HirKind

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pub fn subs(&self) -> &[Hir]

Returns a slice of this kind’s sub-expressions, if any.

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impl Clone for HirKind

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fn clone(&self) -> HirKind

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 HirKind

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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 HirKind

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

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impl StructuralPartialEq for HirKind

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.