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

The kind of an arbitrary Hir expression.

Variants

Empty

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

Literal(Literal)

A single literal character that matches exactly this character.

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.

Anchor(Anchor)

An anchor assertion. An anchor assertion match always has zero length.

WordBoundary(WordBoundary)

A word boundary assertion, which may or may not be Unicode aware. A word boundary assertion match always has zero length.

Repetition(Repetition)

A repetition operation applied to a child expression.

Group(Group)

A possibly capturing group, which contains a child expression.

Concat(Vec<Hir>)

A concatenation of expressions. A concatenation always has at least two child expressions.

A concatenation matches only if each of its child expression matches one after the other.

Alternation(Vec<Hir>)

An alternation of expressions. An alternation always has at least two child expressions.

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

Implementations

Return true if and only if this HIR is the empty regular expression.

Note that this is not defined inductively. That is, it only tests if this kind is the Empty variant. To get the inductive definition, use the is_match_empty method on Hir.

Returns true if and only if this kind has any (including possibly empty) subexpressions.

Trait Implementations

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

Formats the value using the given formatter. Read more

This method tests for self and other values to be equal, and is used by ==. Read more

This method tests for !=.

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

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

The resulting type after obtaining ownership.

Creates owned data from borrowed data, usually by cloning. Read more

🔬 This is a nightly-only experimental API. (toowned_clone_into)

Uses borrowed data to replace owned data, usually by cloning. Read more

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.