Enum Sentinel 

#[repr(u32)]
pub enum Sentinel {
    Inline = 57_345,
    BlockLeaf = 57_346,
    BlockOpen = 57_347,
    BlockClose = 57_348,
}

Sentinel kind tag.

Each variant matches a Private-Use-Area codepoint reserved by the lexer. The discriminant doubles as the codepoint, so the as_char / from_char projections compile to a noop / range check respectively.

#[repr(u32)] pins the in-memory layout to the codepoint scalar, matching Rust’s char ABI for round-tripping cost. The variant values stay inside the PUA range (0xE000..=0xF8FF); pinning the 4-byte layout instead of u8 lets the enum carry the codepoint directly without a lookup table.

Variants

Inline = 57_345

Inline Aozora span (ruby / bouten / annotation / gaiji / TCY / kaeriten).

BlockLeaf = 57_346

Block-leaf Aozora line (page break, section break, leaf indent, sashie).

BlockOpen = 57_347

Paired-container open line (e.g. ［＃ここから字下げ］).

BlockClose = 57_348

Paired-container close line (e.g. ［＃ここで字下げ終わり］).

Implementations

impl Sentinel

pub const ALL: [Sentinel; 4]

All sentinel kinds in declaration order. Useful for collision scans, exhaustive iteration, and round-trip property tests.

pub const fn as_char(self) -> char

Codepoint for this sentinel kind. Compiles to a constant — the #[repr(u32)] discriminant is the codepoint scalar, so the transmute via char::from_u32_unchecked is a noop. We use the safe char::from_u32 path here and rely on the variant discriminants being valid scalar values (they are: PUA is a proper subset of the scalar range and all four sentinels lie inside it).

Panics

panic!s with a const-eval-friendly message if a future variant ever lands an invalid Unicode scalar discriminant. All current variants (Self::Inline / Self::BlockLeaf / Self::BlockOpen / Self::BlockClose) lie in the U+E001..U+E004 PUA range and never trigger the panic; the arm exists to keep #[repr(u32)] discriminants honest at const-eval time.

pub const fn from_char(c: char) -> Option<Sentinel>

Reverse of Sentinel::as_char. Returns None for any codepoint outside the four reserved sentinels.

Trait Implementations

impl Clone for Sentinel

fn clone(&self) -> Sentinel

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Sentinel

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

Formats the value using the given formatter.

impl Hash for Sentinel

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

where __H: Hasher,

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 Sentinel

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

impl Eq for Sentinel

impl StructuralPartialEq for Sentinel