Enum ParseKind 

#[non_exhaustive]
pub enum ParseKind {
    Viewport,
    Top,
    Bottom,
}

Discriminates the purpose of a parse request / result so the App can route it to the correct per-slot cache field.

• Viewport — the current visible region (already existed; default).
• Top — rows 0..min(3*h, line_count) pre-cached so gg never flashes un-highlighted rows.
• Bottom — rows line_count - min(3*h, line_count)..line_count pre-cached so G never flashes un-highlighted rows.

Ordering is load-bearing for the perf invariant: the worker queue is FIFO, so submitting Viewport first, then Top, then Bottom ensures the retained tree is built on the Viewport pass and the subsequent passes ride it incrementally (~1-5 ms each).

Examples

use hjkl_syntax::ParseKind;
assert_ne!(ParseKind::Viewport, ParseKind::Top);
assert_ne!(ParseKind::Top, ParseKind::Bottom);

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Viewport

The current visible viewport region.

Top

The top of the document (rows 0..N) — pre-cached for gg.

Bottom

The bottom of the document (rows line_count-N..line_count) — pre-cached for G.

Trait Implementations

impl Clone for ParseKind

fn clone(&self) -> ParseKind

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ParseKind

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

Formats the value using the given formatter.

impl PartialEq for ParseKind

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

impl Eq for ParseKind

impl StructuralPartialEq for ParseKind