Expand description
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
Structs
Type Definitions
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