Struct regex_syntax::hir::literal::Literal

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pub struct Literal { /* private fields */ }
Expand description

A single literal extracted from an Hir expression.

A literal is composed of two things:

  • A sequence of bytes. No guarantees with respect to UTF-8 are provided. In particular, even if the regex a literal is extracted from is UTF-8, the literal extracted may not be valid UTF-8. (For example, if an Extractor limit resulted in trimming a literal in a way that splits a codepoint.)
  • Whether the literal is “exact” or not. An “exact” literal means that it has not been trimmed, and may continue to be extended. If a literal is “exact” after visiting the entire Hir expression, then this implies that the literal leads to a match state. (Although it doesn’t necessarily imply all occurrences of the literal correspond to a match of the regex, since literal extraction ignores look-around assertions.)

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impl Literal

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pub fn exact<B: Into<Vec<u8>>>(bytes: B) -> Literal

Returns a new exact literal containing the bytes given.

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pub fn inexact<B: Into<Vec<u8>>>(bytes: B) -> Literal

Returns a new inexact literal containing the bytes given.

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pub fn as_bytes(&self) -> &[u8]

Returns the bytes in this literal.

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pub fn into_bytes(self) -> Vec<u8>

Yields ownership of the bytes inside this literal.

Note that this throws away whether the literal is “exact” or not.

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pub fn len(&self) -> usize

Returns the length of this literal in bytes.

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pub fn is_empty(&self) -> bool

Returns true if and only if this literal has zero bytes.

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pub fn is_exact(&self) -> bool

Returns true if and only if this literal is exact.

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pub fn make_inexact(&mut self)

Marks this literal as inexact.

Inexact literals can never be extended. For example, Seq::cross_forward will not extend inexact literals.

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pub fn reverse(&mut self)

Reverse the bytes in this literal.

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pub fn extend(&mut self, lit: &Literal)

Extend this literal with the literal given.

If this literal is inexact, then this is a no-op.

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pub fn keep_first_bytes(&mut self, len: usize)

Trims this literal such that only the first len bytes remain. If this literal has fewer than len bytes, then it remains unchanged. Otherwise, the literal is marked as inexact.

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pub fn keep_last_bytes(&mut self, len: usize)

Trims this literal such that only the last len bytes remain. If this literal has fewer than len bytes, then it remains unchanged. Otherwise, the literal is marked as inexact.

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impl AsRef<[u8]> for Literal

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fn as_ref(&self) -> &[u8]

Converts this type into a shared reference of the (usually inferred) input type.
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impl Clone for Literal

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fn clone(&self) -> Literal

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 Literal

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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 From<char> for Literal

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fn from(ch: char) -> Literal

Converts to this type from the input type.
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impl From<u8> for Literal

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fn from(byte: u8) -> Literal

Converts to this type from the input type.
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impl FromIterator<Literal> for Seq

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fn from_iter<T: IntoIterator<Item = Literal>>(it: T) -> Seq

Creates a value from an iterator. Read more
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impl Ord for Literal

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fn cmp(&self, other: &Literal) -> Ordering

This method returns an Ordering between self and other. Read more
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fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized + PartialOrd,

Restrict a value to a certain interval. Read more
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impl PartialEq for Literal

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fn eq(&self, other: &Literal) -> 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 PartialOrd for Literal

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fn partial_cmp(&self, other: &Literal) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl Eq for Literal

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impl StructuralPartialEq for Literal

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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default 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.