Struct LineWrapCache 

pub struct LineWrapCache { /* private fields */ }

Bounded FIFO cache from LineWrapKey to Arc<Vec<ViewLine>>.

FIFO (not LRU) because the dominant access pattern is sequential scrolling: each line is queried a few times in close succession, then rarely again. FIFO is simpler to reason about and matches this pattern well enough. If future profiling shows churn we can swap the eviction policy — the external API doesn’t change.

Implementations

impl LineWrapCache

pub fn with_byte_budget(byte_budget: usize) -> Self

pub fn len(&self) -> usize

pub fn is_empty(&self) -> bool

pub fn byte_budget(&self) -> usize

pub fn current_bytes(&self) -> usize

pub fn get(&self, key: &LineWrapKey) -> Option<Arc<Vec<ViewLine>>>

Look up a cached value. Returns None on miss. The returned Arc is a cheap clone; callers can hold it without copying the underlying Vec<ViewLine>.

pub fn get_or_insert_with<F>( &mut self, key: LineWrapKey, compute: F, ) -> Arc<Vec<ViewLine>>

where F: FnOnce() -> Vec<ViewLine>,

Query by key; on miss, run compute and store its result. The primary entry point for both the renderer’s write path and the scroll-math miss handler.

Returns the (possibly just-computed) value as an Arc. The compute closure is called at most once per cache miss; hits do not invoke it.

pub fn put(&mut self, key: LineWrapKey, value: Arc<Vec<ViewLine>>)

Unconditionally store a value for key. If key is already present, its value is replaced in place and its FIFO position is not changed (this keeps the queue simple — re-inserts don’t refresh age). Byte-budget accounting is updated.

pub fn clear(&mut self)

Remove all entries. Used by tests and by future plugin-lifecycle events.

Trait Implementations

impl Clone for LineWrapCache

fn clone(&self) -> LineWrapCache

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LineWrapCache

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

Formats the value using the given formatter.

impl Default for LineWrapCache

fn default() -> Self

Returns the “default value” for a type.