Enum QuantifierKind 

pub enum QuantifierKind {
    Optional,
    ZeroOrMore,
    OneOrMore,
}

Quantifier kind for pattern matching.

Variants

Optional

? or ?? - zero or one.

ZeroOrMore

* or *? - zero or more.

OneOrMore

+ or +? - one or more.

Implementations

impl QuantifierKind

pub fn requires_row_capture(self) -> bool

Whether this quantifier requires strict dimensionality (row capture).

* and + produce arrays, so internal captures need explicit row structure. ? produces at most one value, so no dimensionality issue.

pub fn is_non_empty(self) -> bool

Whether this quantifier guarantees at least one match.

pub fn can_be_empty(self) -> bool

Whether this quantifier can match zero times.

Trait Implementations

impl Clone for QuantifierKind

fn clone(&self) -> QuantifierKind

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for QuantifierKind

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

Formats the value using the given formatter.

impl PartialEq for QuantifierKind

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

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for QuantifierKind

impl Eq for QuantifierKind

impl StructuralPartialEq for QuantifierKind