1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79

extern crate proc_macro;

use proc_macro::TokenStream;
use quote::quote;
use syn::{parse_macro_input, DeriveInput};

#[proc_macro_derive(Pipeline)]
pub fn derive_pipeline(input: TokenStream) -> TokenStream {
    let input = parse_macro_input!(input as DeriveInput);

    let ident = &input.ident;

    let gen = quote! {
        impl render::Pipeline for #ident {
            fn box_eq(&self, other: &dyn Any) -> bool {
                other.downcast_ref::<Self>().map_or(false, |a| self == a)
            }
            fn as_any(&self) -> &dyn Any {
                self
            }
            fn clone_box(&self) -> Box<dyn render::Pipeline> {
                Box::new(self.clone())
            }
        }
    };

    TokenStream::from(gen)
}

#[proc_macro_derive(AsAny)]
pub fn derive_as_any(input: TokenStream) -> TokenStream {
    let input = parse_macro_input!(input as DeriveInput);

    let ident = &input.ident;

    let gen = quote! {
        impl AsAny for #ident {
            fn as_any(&self) -> &dyn Any {
                self
            }

            fn as_any_mut(&mut self) -> &mut dyn Any {
                self
            }
        }
    };

    TokenStream::from(gen)
}

#[proc_macro_derive(Event)]
pub fn derive_event(input: TokenStream) -> TokenStream {
    let input = parse_macro_input!(input as DeriveInput);

    let ident = &input.ident;

    let gen = quote! {
        impl Event for #ident {}
    };

    TokenStream::from(gen)
}

#[proc_macro_derive(IntoHandler)]
pub fn derive_into_handler(input: TokenStream) -> TokenStream {
    let input = parse_macro_input!(input as DeriveInput);

    let ident = &input.ident;

    let gen = quote! {
        impl Into<Rc<dyn EventHandler>> for #ident {
            fn into(self) -> Rc<dyn EventHandler> {
                Rc::new(self)
            }
        }
    };

    TokenStream::from(gen)
}