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use std::convert::From;
use binding::rproc;
use types::Value;
use util;
use {AnyObject, Class, Object, VerifiedObject};
/// `Proc` (works with `Lambda` as well)
#[derive(Debug, PartialEq)]
pub struct Proc {
value: Value,
}
impl Proc {
/// Calls a proc with given arguments
///
/// # Examples
///
/// ```no_run
/// #[macro_use]
/// extern crate ruru;
///
/// use ruru::{Class, Object, Proc, RString};
///
/// class!(Greeter);
///
/// methods!(
/// Greeter,
/// itself,
///
/// fn greet_rust_with(greeting_template: Proc) -> RString {
/// let name = RString::new("Rust").to_any_object();
/// let rendered_template = greeting_template.unwrap().call(vec![name]);
///
/// rendered_template.try_convert_to::<RString>().unwrap()
/// }
/// );
///
/// fn main() {
/// Class::new("Greeter", None).define(|itself| {
/// itself.def_self("greet_rust_with", greet_rust_with);
/// });
/// }
/// ```
///
/// Ruby:
///
/// ```ruby
/// class Greeter
/// def self.greet_rust_with(greeting_template)
/// greeting_template.call('Rust')
/// end
/// end
///
/// greeting_template = -> (name) { "Hello, #{name}!" }
///
/// Greeter.greet_rust_with(greeting_template) # => "Hello, Rust!"
/// ```
pub fn call(&self, arguments: Vec<AnyObject>) -> AnyObject {
let (argc, argv) = util::create_arguments(arguments);
let result = rproc::call(self.value(), argc, argv.as_ptr());
AnyObject::from(result)
}
}
impl From<Value> for Proc {
fn from(value: Value) -> Self {
Proc { value: value }
}
}
impl Object for Proc {
#[inline]
fn value(&self) -> Value {
self.value
}
}
impl VerifiedObject for Proc {
fn is_correct_type<T: Object>(object: &T) -> bool {
object.class() == Class::from_existing("Proc")
}
fn error_message() -> &'static str {
"Error converting to Proc"
}
}