Struct icu::casemapping::provider::CaseMappingExceptions

pub struct CaseMappingExceptions<'data> {
    pub slots: ZeroVec<'data, u16>,
    pub strings: VarZeroVec<'data, str, Index16>,
}

This represents case mapping exceptions that can’t be represented as a delta applied to the original code point. Similar to ICU4C, data is stored as a u16 array. The codepoint trie in CaseMapping stores offsets into this array. The u16 at that index contains a set of flags describing the subsequent data.

[idx + 0] Header word: Bits: 0..7 Flag bits indicating which optional slots are present (if any): 0: Lowercase mapping (code point) 1: Case folding (code point) 2: Uppercase mapping (code point) 3: Titlecase mapping (code point) 4: Delta to simple case mapping (code point) (sign stored separately) 5: RESERVED 6: Closure mappings (string; see below) 7: Full mappings (strings; see below) 8 Double-width slots. If set, then each optional slot is stored as two elements of the array (high and low halves of 32-bit values) instead of a single element. 9 Has no simple case folding, even if there is a simple lowercase mapping 10 The value in the delta slot is negative 11 Is case-sensitive (not exposed) 12..13 Dot type 14 Has conditional special casing 15 Has conditional case folding

If double-width slots is false:

[idx + 1] First optional slot [idx + 2] Second optional slot [idx + 3] Third optional slot …

If double-width slots is true:

[idx + 1] First optional slot [idx + 3] Second optional slot [idx + 5] Third optional slot …

In ICU4C, the full mapping and closure strings are stored inline in the data, encoded as UTF-16, and the full mapping and closure slots contain information about the length of those strings. To avoid the need for allocations when converting from UTF-16 to UTF-8, we instead store strings encoded as UTF-8 in a side table. The full mapping and closure slots contain indices into that side table.

Fields

slots: ZeroVec<'data, u16>

strings: VarZeroVec<'data, str, Index16>

Trait Implementations

impl<'data> Bake for CaseMappingExceptions<'data>

fn bake(&self, env: &CrateEnv) -> TokenStream

Returns a TokenStream that would evaluate to self.

impl<'data> Clone for CaseMappingExceptions<'data>

fn clone(&self) -> CaseMappingExceptions<'data>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'data> Debug for CaseMappingExceptions<'data>

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

Formats the value using the given formatter.

impl<'de, 'data> Deserialize<'de> for CaseMappingExceptions<'data> where
    'de: 'data, 

fn deserialize<__D>(
    __deserializer: __D
) -> Result<CaseMappingExceptions<'data>, <__D as Deserializer<'de>>::Error> where
    __D: Deserializer<'de>, 

Deserialize this value from the given Serde deserializer.

impl<'data> PartialEq<CaseMappingExceptions<'data>> for CaseMappingExceptions<'data>

fn eq(&self, other: &CaseMappingExceptions<'data>) -> bool

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

fn ne(&self, other: &CaseMappingExceptions<'data>) -> bool

This method tests for !=.

impl<'data> Serialize for CaseMappingExceptions<'data>

fn serialize<__S>(
    &self,
    __serializer: __S
) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error> where
    __S: Serializer, 

Serialize this value into the given Serde serializer.

impl<'a> Yokeable<'a> for CaseMappingExceptions<'static>

type Output = CaseMappingExceptions<'a>

This type MUST be Self with the 'static replaced with 'a, i.e. Self<'a>

fn transform(
    &'a self
) -> &'a <CaseMappingExceptions<'static> as Yokeable<'a>>::Output

This method must cast self between &'a Self<'static> and &'a Self<'a>.

fn transform_owned(
    self
) -> <CaseMappingExceptions<'static> as Yokeable<'a>>::Output

This method must cast self between Self<'static> and Self<'a>.

unsafe fn make(
    this: <CaseMappingExceptions<'static> as Yokeable<'a>>::Output
) -> CaseMappingExceptions<'static>

This method can be used to cast away Self<'a>’s lifetime.

fn transform_mut<F>(&'a mut self, f: F) where
    F: 'static + for<'b> FnOnce(&'b mut <CaseMappingExceptions<'static> as Yokeable<'a>>::Output), 

This method must cast self between &'a mut Self<'static> and &'a mut Self<'a>, and pass it to f.

impl<'zf, 'zf_inner> ZeroFrom<'zf, CaseMappingExceptions<'zf_inner>> for CaseMappingExceptions<'zf>

fn zero_from(
    this: &'zf CaseMappingExceptions<'zf_inner>
) -> CaseMappingExceptions<'zf>

Clone the other C into a struct that may retain references into C.

impl<'data> Eq for CaseMappingExceptions<'data>

impl<'a> IsCovariant<'a> for CaseMappingExceptions<'a>

impl<'data> StructuralEq for CaseMappingExceptions<'data>

impl<'data> StructuralPartialEq for CaseMappingExceptions<'data>