Enum futf::Meaning

pub enum Meaning {
    Whole(char),
    LeadSurrogate(u16),
    TrailSurrogate(u16),
    Prefix(usize),
    Suffix,
}

Meaning of a complete or partial UTF-8 codepoint.

Not all checking is performed eagerly. That is, a codepoint Prefix or Suffix may in reality have no valid completion.

Variants

Whole(char)

We found a whole codepoint.

LeadSurrogate(u16)

We found something that isn’t a valid Unicode codepoint, but it would correspond to a UTF-16 leading surrogate code unit, i.e. a value in the range U+D800 - U+DBFF.

The argument is the code unit’s 10-bit index within that range.

These are found in UTF-8 variants such as CESU-8 and WTF-8.

TrailSurrogate(u16)

We found something that isn’t a valid Unicode codepoint, but it would correspond to a UTF-16 trailing surrogate code unit, i.e. a value in the range U+DC00 - U+DFFF.

The argument is the code unit’s 10-bit index within that range.

These are found in UTF-8 variants such as CESU-8 and WTF-8.

Prefix(usize)

We found only a prefix of a codepoint before the buffer ended.

Includes the number of additional bytes needed.

Suffix

We found only a suffix of a codepoint before running off the start of the buffer.

Up to 3 more bytes may be needed.

Trait Implementations

impl Clone for Meaning

fn clone(&self) -> Meaning

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Meaning

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

Formats the value using the given formatter.

impl Hash for Meaning

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 Ord for Meaning

fn cmp(&self, other: &Meaning) -> 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 + PartialOrd,

Restrict a value to a certain interval.

impl PartialEq for Meaning

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

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

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

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for Meaning

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

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

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

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

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

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

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

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

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

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

impl Copy for Meaning

impl Eq for Meaning

impl StructuralPartialEq for Meaning