Enum SamplingStrategy 

pub enum SamplingStrategy {
    Exhaustive {
        max_depth: usize,
    },
    Random {
        seed: u64,
        count: usize,
    },
    CoverageGuided {
        coverage_map: Option<CoverageMap>,
        max_depth: usize,
        seed: u64,
    },
    Swarm {
        features_per_batch: usize,
    },
    Boundary {
        boundary_probability: f64,
    },
}

Sampling strategy for code generation

From spec Section 4.2: Different strategies for exploring the program space.

Variants

Exhaustive

Exhaustive enumeration up to depth N

Systematically enumerate all valid programs up to the specified AST depth. Best for small grammars or low depths.

Fields

max_depth: usize

Maximum AST depth to enumerate

Random

Random sampling with grammar weights

Generate random programs using production rule weights.

Fields

seed: u64

Random seed for reproducibility

count: usize

Number of samples to generate

CoverageGuided

Coverage-guided generation (NAUTILUS-style)

Prioritize unexplored AST paths based on coverage feedback. From Aschermann et al. (2019) NAUTILUS.

Fields

coverage_map: Option<CoverageMap>

Optional initial coverage map to guide generation

max_depth: usize

Maximum AST depth for generation

seed: u64

Random seed for reproducibility

Swarm

Swarm testing (random feature subsets per batch)

Generate programs using random subsets of language features. Implements Heijunka (leveling) for balanced coverage.

Fields

features_per_batch: usize

Number of features to enable per batch

Boundary

Boundary-focused sampling

Emphasize edge values (0, -1, MAX_INT, empty collections, etc.).

Fields

boundary_probability: f64

Probability of using a boundary value

Trait Implementations

impl Clone for SamplingStrategy

fn clone(&self) -> SamplingStrategy

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SamplingStrategy

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

Formats the value using the given formatter.

impl Default for SamplingStrategy

fn default() -> Self

Returns the “default value” for a type.