Struct EvalConfig

pub struct EvalConfig {
    pub output_fn: Box<dyn Fn(String) + Send>,
}

Fields

output_fn: Box<dyn Fn(String) + Send>

Implementations

impl EvalConfig

pub fn new() -> Self

pub fn with_output(self, output_fn: impl Fn(String) + Send + 'static) -> Self

If you want to capture the output of the evaluator, you can use this function.

This closure will be called every time the evaluator prints something. The string passed to the closure is the string that would be printed.

Examples

use mechylang::EvalConfig;
use mechylang::Evaluator;
use std::sync::Arc;
use std::sync::Mutex;

let (sender, receiver) = std::sync::mpsc::channel();

let config = EvalConfig::new().with_output(move |string| {
   sender.send(string).unwrap();
   // You can also do other things with the string here, like write it to a file.
});

Evaluator::eval("print(\"Hello, world!\")", &mut Default::default(), config).unwrap();

assert_eq!(receiver.recv().unwrap(), "Hello, world!");

Trait Implementations

impl Debug for EvalConfig

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for EvalConfig

fn default() -> Self

Returns the “default value” for a type.