Struct Repetition

pub struct Repetition {
    pub min: u32,
    pub max: Option<u32>,
    pub greedy: bool,
    pub sub: Box<Hir>,
}

The high-level intermediate representation of a repetition operator.

A repetition operator permits the repetition of an arbitrary sub-expression.

Fields

min: u32

The minimum range of the repetition.

Note that special cases like ?, + and * all get translated into the ranges {0,1}, {1,} and {0,}, respectively.

When min is zero, this expression can match the empty string regardless of what its sub-expression is.

max: Option<u32>

The maximum range of the repetition.

Note that when max is None, min acts as a lower bound but where there is no upper bound. For something like x{5} where the min and max are equivalent, min will be set to 5 and max will be set to Some(5).

greedy: bool

Whether this repetition operator is greedy or not. A greedy operator will match as much as it can. A non-greedy operator will match as little as it can.

Typically, operators are greedy by default and are only non-greedy when a ? suffix is used, e.g., (expr)* is greedy while (expr)*? is not. However, this can be inverted via the U “ungreedy” flag.

sub: Box<Hir>

The expression being repeated.

Implementations

impl Repetition

pub fn with(&self, sub: Hir) -> Repetition

Returns a new repetition with the same min, max and greedy values, but with its sub-expression replaced with the one given.

Trait Implementations

impl Clone for Repetition

fn clone(&self) -> Repetition

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Repetition

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

Formats the value using the given formatter.

impl PartialEq for Repetition

fn eq(&self, other: &Repetition) -> 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 Eq for Repetition

impl StructuralPartialEq for Repetition

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 24 bytes