Crate seuil 

seuil-rs

A complete, safe, elite-tested JSONata implementation in Rust.

Seuil is French for “threshold” – the gateway between raw JSON data and the structured output your application needs.

Quick Start

use seuil::Seuil;

let expr = Seuil::compile("name").unwrap();
let result = expr.evaluate(&serde_json::json!({"name": "Alice"})).unwrap();
assert_eq!(result, serde_json::json!("Alice"));

Deterministic Simulation Testing

All non-determinism (time, randomness) is injectable via the clock::Environment trait:

use seuil::clock::MockEnvironment;
use seuil::EvalConfig;

let env = MockEnvironment::new(0xDEAD_BEEF);
let config = EvalConfig::with_environment(&env);
// All $now(), $millis(), $random(), $uuid() calls are now deterministic.

Re-exports

pub use errors::Error;

pub use errors::Span;

Modules

clock

Injectable environment for deterministic simulation testing.

datetime

DateTime picture string formatting and parsing for JSONata.

errors

Error types for seuil-rs.

evaluator

Expression evaluator.

parser

JSONata expression parser.

Structs

EvalConfig

Configuration for expression evaluation.

Seuil

A compiled JSONata expression, ready for repeated evaluation.

Type Aliases

Result

Result type for seuil operations.