Crate v_eval

Evaluate some expresions with context

use v_eval::{Value, Eval};

let e = Eval::default()
    .insert("foo", "true")?
    .insert("string", "\"foo\"")?
    .insert("opt", "Some(true)")?
    .insert("bar", "false")?;

assert_eq!(e.eval("foo != bar").unwrap(), Value::Bool(true));
assert_eq!(
    e.eval("true && foo != bar && true").unwrap(),
    Value::Bool(true)
);
assert_eq!(e.eval("1 == 1 != bar").unwrap(), Value::Bool(true));
assert_eq!(e.eval("1 == 1 + 1 == bar").unwrap(), Value::Bool(true));

assert_eq!(e.eval("1.5.trunc()").unwrap(), Value::Int(1));
assert_eq!(e.eval("50.log10().trunc() == 1").unwrap(), Value::Bool(true));
assert_eq!(e.eval("Some(1.log10()).unwrap()").unwrap(), Value::Float(1.0f64.log10()));

// Option by default
assert_eq!(e.eval("None.unwrap()"), None);
assert_eq!(e.eval("not_exist.unwrap_or(1)").unwrap(), Value::Int(1));
assert_eq!(e.eval("opt.xor(Some(1))").unwrap(), Value::Option(Box::new(None)));
assert_eq!(e.eval("not_exist.and(Some(1)).is_some()").unwrap(), Value::Bool(false));
assert_eq!(e.eval("foo.unwrap_or(false)").unwrap(), Value::Bool(true));

// Dynamic type checked
assert_eq!(e.eval("foo.is_bool()").unwrap(), Value::Bool(true));
assert_eq!(e.eval("string.is_bool()").unwrap(), Value::Bool(false));
assert_eq!(e.eval("string.is_vec()").unwrap(), Value::Bool(false));
assert_eq!(e.eval("foo.is_same(bar)").unwrap(), Value::Bool(true));

Structs

Eval	Evaluator with context

Enums

Value

Wrapper for value implements simple operations and check types

Functions

eval