Crate ragfs_chunker 

ragfs-chunker

Document chunking strategies for the RAGFS indexing pipeline.

This crate splits ExtractedContent into smaller chunks suitable for embedding. Different strategies optimize for different content types.

Chunking Strategies

Chunker	Best For	Method
FixedSizeChunker	General text	Token-based splitting with overlap
CodeChunker	Source code	Pattern matching on function/class signatures
SemanticChunker	Documents	Structure-aware (headings, paragraphs)

Usage

use ragfs_chunker::{ChunkerRegistry, FixedSizeChunker, CodeChunker, SemanticChunker};
use ragfs_core::ChunkConfig;

// Create a registry with all chunkers
let mut registry = ChunkerRegistry::new();
registry.register("fixed", FixedSizeChunker::new());
registry.register("code", CodeChunker::new());
registry.register("semantic", SemanticChunker::new());
registry.set_default("fixed");

// Configure chunking parameters
let config = ChunkConfig {
    target_size: 512,    // Target tokens per chunk
    max_size: 1024,      // Maximum tokens
    overlap: 64,         // Overlap between chunks
    hierarchical: true,  // Enable parent/child relationships
    max_depth: 2,        // Maximum hierarchy depth
};

// Chunk content
let chunks = registry.chunk(&content, &content_type, &config).await?;

Fixed-Size Chunking

The FixedSizeChunker splits text into chunks of approximately equal size:

• Token-based sizing (not character-based)
• Configurable overlap for context preservation
• Smart break detection (prefers newlines, sentence boundaries)

Code-Aware Chunking

The CodeChunker splits on function/class signatures via regex-style pattern matching (not a tree-sitter AST):

• Prefers function/class boundaries when patterns match
• Falls back to line-based chunks when no signatures are found
• Supports Rust, Python, JavaScript, TypeScript, Go, Java, and C/C++

Semantic Chunking

The SemanticChunker understands document structure:

• Splits on headings and sections
• Preserves paragraph integrity
• Maintains hierarchical relationships

Components

Type	Description
ChunkerRegistry	Routes content to appropriate chunkers
FixedSizeChunker	Token-based chunking with overlap
CodeChunker	Pattern-based code chunking
SemanticChunker	Document structure-aware chunking

Re-exports

pub use code::CodeChunker;

pub use fixed::FixedSizeChunker;

pub use registry::ChunkerRegistry;

pub use semantic::SemanticChunker;

Modules

code

Code-aware chunking strategy.

fixed

Fixed-size chunking strategy with overlap.

registry

Chunker registry for managing chunking strategies.

semantic

Semantic chunking strategy.