Crate toon_core 

temporal-cortex-toon

Pure-Rust encoder and decoder for TOON (Token-Oriented Object Notation) v3.0.

TOON is a compact, human-readable serialization format designed to reduce LLM token consumption when processing structured data. It achieves this through key folding (indentation instead of braces), tabular compression for uniform arrays, and context-dependent quoting that eliminates unnecessary quote tokens.

Quick start

use toon_core::{encode, decode};

// JSON → TOON
let json = r#"{"name":"Alice","scores":[95,87,92]}"#;
let toon = encode(json).unwrap();
assert_eq!(toon, "name: Alice\nscores[3]: 95,87,92");

// TOON → JSON (roundtrip)
let back = decode(&toon).unwrap();
assert_eq!(back, json);

Modules

• encoder — JSON string → TOON string
• decoder — TOON string → JSON string
• filter — Semantic filtering + TOON encode (filter_and_encode, CalendarFilter)
• error — Error types for parse/encode failures
• types — ToonValue AST (reserved for future direct-manipulation use)

Re-exports

pub use decoder::decode;

pub use encoder::encode;

pub use error::ToonError;

pub use filter::filter_and_encode;

pub use filter::filter_fields;

pub use filter::CalendarFilter;

Modules

decoder

TOON v3.0 Decoder — converts TOON back into JSON.

encoder

TOON v3.0 Encoder — converts JSON into Token-Oriented Object Notation.

error

Error types for TOON encoding and decoding operations.

filter

Semantic filtering – strip unnecessary fields before TOON encoding.

types

TOON value types for direct AST manipulation (reserved for future use).