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

The high-level intermediate representation of a repetition operator.

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

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§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.

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impl Repetition

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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§

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impl Clone for Repetition

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fn clone(&self) -> Repetition

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 Repetition

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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 Repetition

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

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method 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 Repetition

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impl StructuralPartialEq for Repetition

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> 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.