Crate jexl_eval

A JEXL evaluator written in Rust This crate depends on a JEXL parser crate that handles all the parsing and is a part of the same workspace. JEXL is an expression language used by Mozilla, you can find more information here: https://github.com/mozilla/mozjexl

How to use

The access point for this crate is the eval functions of the Evaluator Struct You can use the eval function directly to evaluate standalone statements

For example:

use jexl_eval::Evaluator;
use serde_json::json as value;
let evaluator = Evaluator::new();
assert_eq!(evaluator.eval("'Hello ' + 'World'").unwrap(), value!("Hello World"));

You can also run the statements against a context using the eval_in_context function The context can be any type that implements the serde::Serializable trait and the function will return errors if the statement doesn’t match the context

For example:

use jexl_eval::Evaluator;
use serde_json::json as value;
let context = value!({"a": {"b": 2.0}});
let evaluator = Evaluator::new();
assert_eq!(evaluator.eval_in_context("a.b", context).unwrap(), value!(2.0));

Modules

error

Structs

Evaluator

Type Aliases

TransformFn

TransformFn represents an arbitrary transform function Transform functions take an arbitrary number of serde_json::Valueto represent their arguments and return a serde_json::Value. the transform function itself is responsible for checking if the format and number of the arguments is correct