Enum CompactionStage 

pub enum CompactionStage {
    Verbatim,
    SelectiveTrim,
    SemanticCompress,
    TopicExtract,
    Skeleton,
}

Progressive compaction stages, ordered from least to most aggressive.

The OPENDEV paper demonstrates that staged compression outperforms single-shot summarization because each stage preserves strictly more information than the next, allowing the system to use the least aggressive stage that fits the token budget.

Variants

Verbatim

Stage 0: Full messages, no compression.

SelectiveTrim

Stage 1: Drop social filler (greetings, acks) but keep substantive content.

SemanticCompress

Stage 2: Apply entropy-based compression via PromptCompressor (~60% ratio).

TopicExtract

Stage 3: Reduce each message to its topic sentence.

Skeleton

Stage 4: Collapse entire conversation to a structural outline.

Implementations

impl CompactionStage

pub fn from_excess(excess_ratio: f64) -> Self

Choose compaction stage based on how far over budget the content is.

excess_ratio = current_tokens / target_tokens. A ratio of 1.0 means exactly at budget; >1.0 means over.

Trait Implementations

impl Clone for CompactionStage

fn clone(&self) -> CompactionStage

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CompactionStage

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

Formats the value using the given formatter.

impl Ord for CompactionStage

fn cmp(&self, other: &CompactionStage) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for CompactionStage

fn eq(&self, other: &CompactionStage) -> 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 PartialOrd for CompactionStage

fn partial_cmp(&self, other: &CompactionStage) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for CompactionStage

impl Eq for CompactionStage

impl StructuralPartialEq for CompactionStage