Enum Layer 

#[repr(u8)]
pub enum Layer {
    Auto = 0,
    Phrase = 1,
    Zigen = 2,
    Jianma3 = 3,
    Jianma2 = 4,
    Jianma1 = 5,
}

Discriminants are ascending priority: Auto = 0 is lowest, Jianma1 is highest. This makes the FST’s packed (layer << 56) | freq compare correctly with raw u64 ordering — higher u64 = higher priority — so the build-time merge step can keep the larger value on collision without special casing.

Variants

Auto = 0

Auto-decomposed CJK extension character — algorithmically valid but may pick a non-canonical 字根 sequence.

Phrase = 1

Multi-character phrase (词组).

Zigen = 2

Hand-curated 字根/seed entry — pedagogically canonical decomposition.

Jianma3 = 3

三级简码 — three-letter shortcut.

Jianma2 = 4

二级简码 — two-letter shortcut.

Jianma1 = 5

一级简码 — single-letter shortcut (e.g., g → 一).

Implementations

impl Layer

pub const fn from_u8(b: u8) -> Option<Self>

Decode from the discriminant byte. None for any value outside 0..=5 — used by unpack to recover the layer from a packed FST value, falling back to Layer::Auto on corruption.

pub const fn as_u8(self) -> u8

The discriminant byte (0..=5).

pub const fn as_index(self) -> usize

Convert to a usize index suitable for LAYER_BASE / DEFAULT_LAYER_PREFS array access.

pub const fn base(self) -> u64

Layer base weight. Equivalent to LAYER_BASE[self.as_index()].

Trait Implementations

impl Clone for Layer

fn clone(&self) -> Layer

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Layer

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

Formats the value using the given formatter.

impl Hash for Layer

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 PartialEq for Layer

fn eq(&self, other: &Layer) -> 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 Copy for Layer

impl Eq for Layer

impl StructuralPartialEq for Layer