Struct LevelRun 

pub struct LevelRun {
    pub start: usize,
    pub end: usize,
    pub level: u8,
}

A maximal substring of characters that share an embedding level per UAX #9 BD7 (§3.1.2).

start is the index of the first character in the run; end is one past the last character (half-open, matching Range<usize> idioms). Both indices refer back into the level vector returned by resolve_explicit_levels (and therefore the underlying classes slice the caller fed to that function — they are the same length).

X9-removed positions (RLE / LRE / RLO / LRO / PDF / BN) are included in their containing level run — BD7 partitions on assigned embedding level, not on removal status. The implicit phases (W / N / I) walk runs via IsolatingRunSequence::indices which skips removed positions per the X9 “behave as though the characters were not present” clause.

Provenance: BD7 transcribed verbatim from docs/text/unicode-bidi/tr9-50-uax9-unicode16.html §3.1.2 (UAX #9 Revision 50, Unicode 16.0).

Fields

start: usize

First character index in the run (inclusive).

end: usize

One past the last character index in the run (exclusive).

level: u8

Embedding level shared by every character in the run.

Implementations

impl LevelRun

pub fn len(&self) -> usize

Length of the run in character positions.

pub fn is_empty(&self) -> bool

true iff Self::len is zero.

Trait Implementations

impl Clone for LevelRun

fn clone(&self) -> LevelRun

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for LevelRun

impl Debug for LevelRun

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

Formats the value using the given formatter.

impl Eq for LevelRun

impl PartialEq for LevelRun

fn eq(&self, other: &LevelRun) -> 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 StructuralPartialEq for LevelRun