Enum Utf8Sequence

pub enum Utf8Sequence {
    One(Utf8Range),
    Two([Utf8Range; 2]),
    Three([Utf8Range; 3]),
    Four([Utf8Range; 4]),
}

Utf8Sequence represents a sequence of byte ranges.

To match a Utf8Sequence, a candidate byte sequence must match each successive range.

For example, if there are two ranges, [C2-DF][80-BF], then the byte sequence \xDD\x61 would not match because 0x61 < 0x80.

Variants

One(Utf8Range)

One byte range.

Two([Utf8Range; 2])

Two successive byte ranges.

Three([Utf8Range; 3])

Three successive byte ranges.

Four([Utf8Range; 4])

Four successive byte ranges.

Implementations

impl Utf8Sequence

pub fn as_slice(&self) -> &[Utf8Range]

Returns the underlying sequence of byte ranges as a slice.

pub fn len(&self) -> usize

Returns the number of byte ranges in this sequence.

The length is guaranteed to be in the closed interval [1, 4].

pub fn reverse(&mut self)

Reverses the ranges in this sequence.

For example, if this corresponds to the following sequence:

[D0-D3][80-BF]

Then after reversal, it will be

[80-BF][D0-D3]

This is useful when one is constructing a UTF-8 automaton to match character classes in reverse.

pub fn matches(&self, bytes: &[u8]) -> bool

Returns true if and only if a prefix of bytes matches this sequence of byte ranges.

Trait Implementations

impl Clone for Utf8Sequence

fn clone(&self) -> Utf8Sequence

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Utf8Sequence

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

Formats the value using the given formatter.

impl<'a> IntoIterator for &'a Utf8Sequence

type IntoIter = Iter<'a, Utf8Range>

Which kind of iterator are we turning this into?

type Item = &'a Utf8Range

The type of the elements being iterated over.

fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.

impl Ord for Utf8Sequence

fn cmp(&self, other: &Utf8Sequence) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Utf8Sequence

fn eq(&self, other: &Utf8Sequence) -> 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 PartialOrd for Utf8Sequence

fn partial_cmp(&self, other: &Utf8Sequence) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

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

impl Copy for Utf8Sequence

impl Eq for Utf8Sequence

impl StructuralPartialEq for Utf8Sequence

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: 9 bytes

Size for each variant:

• One: 2 bytes
• Two: 4 bytes
• Three: 6 bytes
• Four: 8 bytes