Struct unicode_bidi::level::Level

[+] Show declaration

pub struct Level(_);

[−] Expand description

Embedding Level

Embedding Levels are numbers between 0 and 126 (inclusive), where even values denote a left-to-right (LTR) direction and odd values a right-to-left (RTL) direction.

This struct maintains a valid status for level numbers, meaning that creating a new level, or mutating an existing level, with the value smaller than 0 (before conversion to u8) or larger than 125 results in an Error.

http://www.unicode.org/reports/tr9/#BD2

Methods

impl Level

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pub fn ltr() -> Level

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New LTR level with smallest number value (0).

pub fn rtl() -> Level

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New RTL level with smallest number value (1).

pub fn max_implicit_depth() -> u8

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Maximum depth of the directional status stack during implicit resolutions.

pub fn max_explicit_depth() -> u8

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Maximum depth of the directional status stack during explicit resolutions.

pub fn new(number: u8) -> Result<Level, Error>

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Create new level, fail if number is larger than max_depth + 1.

pub fn new_explicit(number: u8) -> Result<Level, Error>

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Create new level, fail if number is larger than max_depth.

pub fn number(&self) -> u8

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The level number.

pub fn is_ltr(&self) -> bool

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If this level is left-to-right.

pub fn is_rtl(&self) -> bool

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If this level is right-to-left.

pub fn raise(&mut self, amount: u8) -> Result<(), Error>

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Raise level by amount, fail if number is larger than max_depth + 1.

pub fn raise_explicit(&mut self, amount: u8) -> Result<(), Error>

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Raise level by amount, fail if number is larger than max_depth.

pub fn lower(&mut self, amount: u8) -> Result<(), Error>

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Lower level by amount, fail if number goes below zero.

pub fn new_explicit_next_ltr(&self) -> Result<Level, Error>

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The next LTR (even) level greater than this, or fail if number is larger than max_depth.

pub fn new_explicit_next_rtl(&self) -> Result<Level, Error>

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The next RTL (odd) level greater than this, or fail if number is larger than max_depth.

pub fn new_lowest_ge_rtl(&self) -> Result<Level, Error>

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The lowest RTL (odd) level greater than or equal to this, or fail if number is larger than max_depth + 1.

pub fn bidi_class(&self) -> BidiClass

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Generate a character type based on a level (as specified in steps X10 and N2).

pub fn vec(v: &[u8]) -> Vec<Level>

Trait Implementations

impl Into<u8> for Level

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fn into(self) -> u8

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Convert to the level number

impl PartialOrd<Level> for Level

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

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

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

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This method tests less than (for self and other) and is used by the < operator.

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

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

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

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This method tests greater than (for self and other) and is used by the > operator.

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

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

impl Ord for Level

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

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This method returns an Ordering between self and other.

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

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Compares and returns the maximum of two values.

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

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Compares and returns the minimum of two values.

impl PartialEq<Level> for Level

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

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This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Level) -> bool

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This method tests for !=.

impl<'a> PartialEq<&'a str> for Level

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Used for matching levels in conformance tests

fn eq(&self, s: &&'a str) -> bool

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This method tests for self and other values to be equal, and is used by ==.

[+] Expand attributes #[must_use] fn ne(&self, other: &Rhs) -> bool

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This method tests for !=.

impl<'a> PartialEq<String> for Level

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Used for matching levels in conformance tests

fn eq(&self, s: &String) -> bool

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This method tests for self and other values to be equal, and is used by ==.

[+] Expand attributes #[must_use] fn ne(&self, other: &Rhs) -> bool

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This method tests for !=.

impl From<u8> for Level

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fn from(number: u8) -> Level

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Create level by number

impl Clone for Level

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fn clone(&self) -> Level

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Returns a copy of the value.

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

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Performs copy-assignment from source.

impl Copy for Level

impl Eq for Level

impl Debug for Level

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

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Formats the value using the given formatter.