58 lines
1.9 KiB
Rust
58 lines
1.9 KiB
Rust
|
use std::any::Any;
|
||
|
|
use std::boxed::Box;
|
||
|
|
|
||
|
|
use engine::{EvalError, Engine};
|
||
|
|
|
||
|
|
pub trait FnRegister {
|
||
|
|
fn register(self, engine: &mut Engine, name: &str);
|
||
|
|
}
|
||
|
|
|
||
|
|
impl<T: Any, U: Any> FnRegister for fn(&mut T)->U {
|
||
|
|
fn register(self, engine: &mut Engine, name: &str) {
|
||
|
|
let wrapped : Box<Fn(&mut Box<Any>)->Result<Box<Any>, EvalError>> =
|
||
|
|
Box::new(
|
||
|
|
move |x: &mut Box<Any>| {
|
||
|
|
let inside = (*x).downcast_mut() as Option<&mut T>;
|
||
|
|
|
||
|
|
match inside {
|
||
|
|
Some(b) => Ok(Box::new(self(b)) as Box<Any>),
|
||
|
|
None => Err(EvalError::FunctionArgMismatch)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
);
|
||
|
|
|
||
|
|
let ent = engine.fns_arity_1.entry(name.to_string()).or_insert(Vec::new());
|
||
|
|
(*ent).push(wrapped);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
impl<T: Any+Clone, U: Any> FnRegister for fn(T)->U {
|
||
|
|
fn register(self, engine: &mut Engine, name: &str) {
|
||
|
|
let wrapped : Box<Fn(&mut Box<Any>)->Result<Box<Any>, EvalError>> =
|
||
|
|
Box::new(
|
||
|
|
move |x: &mut Box<Any>| {
|
||
|
|
let inside = (*x).downcast_mut() as Option<&mut T>;
|
||
|
|
match inside {
|
||
|
|
Some(b) => Ok(Box::new(self(b.clone())) as Box<Any>),
|
||
|
|
None => Err(EvalError::FunctionArgMismatch)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
);
|
||
|
|
|
||
|
|
let ent = engine.fns_arity_1.entry(name.to_string()).or_insert(Vec::new());
|
||
|
|
(*ent).push(wrapped);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
impl<T: Any> FnRegister for fn()->T {
|
||
|
|
fn register(self, engine: &mut Engine, name: &str) {
|
||
|
|
let wrapped : Box<Fn()->Result<Box<Any>, EvalError>> =
|
||
|
|
Box::new(
|
||
|
|
move || { Ok(Box::new(self()) as Box<Any>) }
|
||
|
|
);
|
||
|
|
|
||
|
|
let ent = engine.fns_arity_0.entry(name.to_string()).or_insert(Vec::new());
|
||
|
|
(*ent).push(wrapped);
|
||
|
|
}
|
||
|
|
}
|