pub fn execute(expr: &str, ctx: Context) -> Result<Value>Expand description
ยงUsage
Calling the engine is simple. At first, define the expression you want to execute. Secondly, create a context to cache the pre-defined inner functions and variables. And then, register the variables and functions to the context. Finally, call the execute function with the expression and context to get the executing result.
use expression_engine::{create_context, execute, Value};
let input = "c = 5+3; c+=10+f; c";
let ctx = create_context!(
"d" => 2,
"b" => true,
"f" => Arc::new(|params| Ok(Value::from(3)))
);
let ans = execute(input, ctx).unwrap();
assert_eq!(ans, Value::from(21))