protospec-build 0.3.0

One binary format language to rule them all, One binary format language to find them, One binary format language to bring them all and in the darkness bind them.
Documentation 
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

use super::*;

pub struct LenFunction;

impl LenFunction {
    fn len(&self, type_: &Type, value: &TokenStream) -> TokenStream {
        match &type_ {
            Type::Container(_) => panic!("cannot call len on container"),
            Type::Enum(e) => {
                let size = e.rep.size();
                quote! {
                    #size
                }
            }
            Type::Bitfield(e) => {
                let size = e.rep.size();
                quote! {
                    #size
                }
            }
            Type::F32 => quote! { 4u64 },
            Type::F64 => quote! { 8u64 },
            Type::Bool => quote! { 1u64 },
            Type::Scalar(s) => {
                let size = s.size();
                quote! {
                    #size
                }
            }
            Type::Array(_) | Type::Foreign(_) => {
                quote! {
                    (#value).len() as u64
                }
            }
            Type::Ref(type_call) => self.len(&*type_call.target.type_.borrow(), value),
        }
    }
}

impl ForeignFunction for LenFunction {
    fn arguments(&self) -> Vec<FFIArgument> {
        vec![FFIArgument {
            name: "list".to_string(),
            type_: None,
            optional: false,
        }]
    }

    fn return_type(&self) -> Type {
        Type::Scalar(ScalarType::U64)
    }

    fn call(&self, arguments: &[FFIArgumentValue]) -> TokenStream {
        self.len(&arguments[0].type_, &arguments[0].value)
    }
}