Struct Key

pub struct Key(/* private fields */);

A key used in a list of Keywords.

The key has to be a two ASCII alphanumerical characters long, with the first character being alphanumeric, and the second being alphabetic.

Examples

use icu::locale::extensions::unicode::Key;

assert!("ca".parse::<Key>().is_ok());

Implementations

impl Key

pub const fn try_from_str(s: &str) -> Result<Self, ParseError>

A constructor which takes a str slice, parses it and produces a well-formed Key.

Examples

use icu_locale_core::extensions :: unicode ::Key;

assert!(Key::try_from_str("ca").is_ok());
assert!(Key::try_from_str("a").is_err());

pub const fn try_from_utf8(code_units: &[u8]) -> Result<Self, ParseError>

See Self::try_from_str

pub const fn try_from_raw(raw: [u8; 2]) -> Result<Self, ParseError>

Safely creates a Key from its raw format as returned by Self::into_raw. Unlike Self::try_from_utf8, this constructor only takes normalized values.

pub const unsafe fn from_raw_unchecked(v: [u8; 2]) -> Self

Unsafely creates a Key from its raw format as returned by Self::into_raw. Unlike Self::try_from_utf8, this constructor only takes normalized values.

Safety

This function is safe iff Self::try_from_raw returns an Ok. This is the case for inputs that are correctly normalized.

pub const fn into_raw(self) -> [u8; 2]

Deconstructs into a raw format to be consumed by from_raw_unchecked or try_from_raw.

pub const fn as_str(&self) -> &str

A helper function for displaying as a &str.

pub fn strict_cmp(self, other: &[u8]) -> Ordering

Compare with BCP-47 bytes.

The return value is equivalent to what would happen if you first converted self to a BCP-47 string and then performed a byte comparison.

This function is case-sensitive and results in a total order, so it is appropriate for binary search. The only argument producing Ordering::Equal is self.as_str().as_bytes().

pub fn normalizing_eq(self, other: &str) -> bool

Compare with a potentially unnormalized BCP-47 string.

The return value is equivalent to what would happen if you first parsed the BCP-47 string and then performed a structural comparison.

impl Key

pub fn to_string(&self) -> String

Converts the given value to a String.

Under the hood, this uses an efficient [Writeable] implementation. However, in order to avoid allocating a string, it is more efficient to use [Writeable] directly.

Trait Implementations

impl AsULE for Key

type ULE = Key

The ULE type corresponding to Self.

fn to_unaligned(self) -> Self::ULE

Converts from Self to Self::ULE.

fn from_unaligned(unaligned: Self::ULE) -> Self

Converts from Self::ULE to Self.

impl Clone for Key

fn clone(&self) -> Key

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Key

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

Formats the value using the given formatter.

impl Display for Key

This trait is implemented for compatibility with fmt!. To create a string, [Writeable::write_to_string] is usually more efficient.

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

Formats the value using the given formatter.

impl<'l> From<&'l Key> for &'l str

fn from(input: &'l Key) -> Self

Converts to this type from the input type.

impl From<Key> for TinyAsciiStr<2>

fn from(input: Key) -> Self

Converts to this type from the input type.

impl FromStr for Key

type Err = ParseError

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type.

impl Hash for Key

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl NicheBytes<2> for Key

const NICHE_BIT_PATTERN: [u8; 2] = tinystr::TinyAsciiStr<2>::NICHE_BIT_PATTERN

impl Ord for Key

fn cmp(&self, other: &Key) -> 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 Key

fn eq(&self, other: &Key) -> 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 Key

fn partial_cmp(&self, other: &Key) -> 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 ULE for Key

fn validate_bytes(bytes: &[u8]) -> Result<(), UleError>

Validates a byte slice, &[u8].

fn parse_bytes_to_slice(bytes: &[u8]) -> Result<&[Self], UleError>

Parses a byte slice, &[u8], and return it as &[Self] with the same lifetime.

unsafe fn slice_from_bytes_unchecked(bytes: &[u8]) -> &[Self]

Takes a byte slice, &[u8], and return it as &[Self] with the same lifetime, assuming that this byte slice has previously been run through Self::parse_bytes_to_slice() with success.

fn slice_as_bytes(slice: &[Self]) -> &[u8]

Given &[Self], returns a &[u8] with the same lifetime.

impl Writeable for Key

fn write_to<W: Write + ?Sized>(&self, sink: &mut W) -> Result

Writes a string to the given sink. Errors from the sink are bubbled up. The default implementation delegates to write_to_parts, and discards any Part annotations.

fn writeable_length_hint(&self) -> LengthHint

Returns a hint for the number of UTF-8 bytes that will be written to the sink.

fn write_to_parts<S>(&self, sink: &mut S) -> Result<(), Error>

where S: PartsWrite + ?Sized,

Write bytes and Part annotations to the given sink. Errors from the sink are bubbled up. The default implementation delegates to write_to, and doesn’t produce any Part annotations.

fn write_to_string(&self) -> Cow<'_, str>

Creates a new String with the data from this Writeable. Like ToString, but smaller and faster.

impl<'a> ZeroMapKV<'a> for Key

type Container = ZeroVec<'a, Key>

The container that can be used with this type: ZeroVec or VarZeroVec.

type Slice = ZeroSlice<Key>

type GetType = Key

The type produced by Container::get()

type OwnedType = Key

The type produced by Container::replace() and Container::remove(), also used during deserialization. If Self is human readable serialized, deserializing to Self::OwnedType should produce the same value once passed through Self::owned_as_self()

impl Copy for Key

impl Eq for Key

impl StructuralPartialEq for Key