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
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
|
use quote::quote;
use crate::reflection::field::{generate as generate_field, ReflectionFieldGenOptions};
use crate::util::find_engine_crate_path;
pub fn generate(input: syn::ItemEnum) -> proc_macro2::TokenStream
{
let engine_crate_path = find_engine_crate_path().unwrap();
let input_ident = input.ident;
let (impl_generics, type_generics, where_clause) = input.generics.split_for_impl();
let variants = input.variants.iter().map(|variant| {
let variant_name =
syn::LitStr::new(&variant.ident.to_string(), variant.ident.span());
let fields = match &variant.fields {
syn::Fields::Unit => quote! { None },
syn::Fields::Named(named_fields) => {
let fields = named_fields.named.iter().enumerate().map(
|(variant_field_index, variant_field)| {
generate_field(
variant_field,
variant_field_index,
&engine_crate_path,
ReflectionFieldGenOptions {
field_vis_override: None,
include_byte_offset: false,
},
)
},
);
quote! {
Some(#engine_crate_path::reflection::EnumVariantFields::Named {
fields: &[#(#fields),*]
})
}
}
syn::Fields::Unnamed(unnamed_fields) => {
let fields = unnamed_fields.unnamed.iter().enumerate().map(
|(variant_field_index, variant_field)| {
generate_field(
variant_field,
variant_field_index,
&engine_crate_path,
ReflectionFieldGenOptions {
field_vis_override: None,
include_byte_offset: false,
},
)
},
);
quote! {
Some(#engine_crate_path::reflection::EnumVariantFields::Unnamed {
fields: &[#(#fields),*]
})
}
}
};
quote! {
#engine_crate_path::reflection::EnumVariant {
name: #variant_name,
fields: #fields
}
}
});
let variant_lookup_match_arms =
input.variants.iter().enumerate().map(|(index, variant)| {
let variant_ident = &variant.ident;
let pattern = match variant.fields {
syn::Fields::Unit => quote! { Self::#variant_ident },
syn::Fields::Named(_) => quote! { Self::#variant_ident { .. } },
syn::Fields::Unnamed(_) => quote! { Self::#variant_ident(..) },
};
quote! {
#pattern => &enum_reflection.variants[#index]
}
});
let is_unit_only = input
.variants
.iter()
.all(|variant| matches!(variant.fields, syn::Fields::Unit));
quote! {
unsafe impl #impl_generics #engine_crate_path::reflection::Reflection for
#input_ident #type_generics #where_clause
{
const TYPE_REFLECTION: &#engine_crate_path::reflection::Type =
&const {
#engine_crate_path::reflection::Type::Enum(
#engine_crate_path::reflection::Enum {
variants: &[#(#variants),*],
is_unit_only: #is_unit_only
}
)
};
}
unsafe impl #impl_generics #engine_crate_path::reflection::EnumReflectionExt for
#input_ident #type_generics #where_clause
{
fn get_variant_reflection(&self)
-> &'static #engine_crate_path::reflection::EnumVariant
{
let enum_reflection = unsafe {
<Self as #engine_crate_path::reflection::Reflection>::TYPE_REFLECTION
.as_enum()
.unwrap_unchecked()
};
match self {
#(#variant_lookup_match_arms),*
}
}
}
}
}
|
