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use std::convert::From;
use crate::{
binding::rproc, types::Value, util, AnyObject, Boolean, Class, Object, VerifiedObject,
};
/// `Proc` (works with `Lambda` as well)
#[derive(Debug)]
#[repr(C)]
pub struct Proc {
value: Value,
}
impl Proc {
/// Calls a proc with given arguments
///
/// # Examples
///
/// ```no_run
/// #[macro_use]
/// extern crate rutie;
///
/// use rutie::{Class, Object, Proc, RString};
///
/// class!(Greeter);
///
/// methods!(
/// Greeter,
/// rtself,
///
/// fn greet_rust_with(greeting_template: Proc) -> RString {
/// let name = RString::new_utf8("Rust").to_any_object();
/// let rendered_template = greeting_template.unwrap().call(&[name]);
///
/// rendered_template.try_convert_to::<RString>().unwrap()
/// }
/// );
///
/// fn main() {
/// Class::new("Greeter", None).define(|klass| {
/// klass.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: &[AnyObject]) -> AnyObject {
let arguments = util::arguments_to_values(arguments);
let result = rproc::call(self.value(), &arguments);
AnyObject::from(result)
}
/// Check if Proc is a lambda
///
/// # Examples
///
/// ```
/// use rutie::{Object, Proc, VM, VerifiedObject};
/// # VM::init();
///
/// let procish = VM::eval("lambda {|a,b| a + b }").unwrap();
///
/// assert!(Proc::is_correct_type(&procish), "not Proc!");
/// ```
///
/// Ruby:
///
/// ```ruby
/// procish = lambda {|a,b| a + b }
///
/// procish.lambda? # => true
/// ```
pub fn is_lambda(&self) -> bool {
Boolean::from(unsafe { self.send("lambda?", &[]) }.value()).to_bool()
}
}
impl From<Value> for Proc {
fn from(value: Value) -> Self {
Proc { value }
}
}
impl Into<Value> for Proc {
fn into(self) -> Value {
self.value
}
}
impl Into<AnyObject> for Proc {
fn into(self) -> AnyObject {
AnyObject::from(self.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 {
Class::from_existing("Proc").case_equals(object)
}
fn error_message() -> &'static str {
"Error converting to Proc"
}
}
impl PartialEq for Proc {
fn eq(&self, other: &Self) -> bool {
self.equals(other)
}
}