radix-sbor-derive 1.3.0

A library of macros for deriving Scrypto SBOR and Manifest SBOR implementation, from the Radix DLT project.
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
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

use proc_macro2::TokenStream;
use syn::Result;

pub fn handle_manifest_decode(input: TokenStream) -> Result<TokenStream> {
    sbor_derive_common::decode::handle_decode(
        input,
        Some("radix_common::data::manifest::ManifestCustomValueKind"),
    )
}

#[cfg(test)]
mod tests {
    use super::*;
    use proc_macro2::TokenStream;
    use quote::quote;
    use std::str::FromStr;

    fn assert_code_eq(a: TokenStream, b: TokenStream) {
        assert_eq!(a.to_string(), b.to_string());
    }

    #[test]
    fn test_decode_struct() {
        let input = TokenStream::from_str("pub struct MyStruct { }").unwrap();
        let output = handle_manifest_decode(input).unwrap();

        assert_code_eq(
            output,
            quote! {
                impl<D: sbor::Decoder<radix_common::data::manifest::ManifestCustomValueKind> >
                    sbor::Decode<radix_common::data::manifest::ManifestCustomValueKind, D> for MyStruct
                {
                    #[inline]
                    fn decode_body_with_value_kind(
                        decoder: &mut D,
                        value_kind: sbor::ValueKind<radix_common::data::manifest::ManifestCustomValueKind>
                    ) -> Result<Self, sbor::DecodeError> {
                        use sbor::{self, Decode};
                        decoder.check_preloaded_value_kind(value_kind, sbor::ValueKind::Tuple)?;
                        decoder.read_and_check_size(0usize)?;
                        Ok(Self {})
                    }
                }
            },
        );
    }

    #[test]
    fn test_decode_enum() {
        let input = TokenStream::from_str("enum MyEnum<T: Bound> { A { named: T }, B(String), C }")
            .unwrap();
        let output = handle_manifest_decode(input).unwrap();

        assert_code_eq(
            output,
            quote! {
                impl<
                        T: Bound,
                        D: sbor::Decoder<radix_common::data::manifest::ManifestCustomValueKind>
                    > sbor::Decode<radix_common::data::manifest::ManifestCustomValueKind, D> for MyEnum<T>
                where
                    T: sbor::Decode<radix_common::data::manifest::ManifestCustomValueKind, D>
                {
                    #[inline]
                    fn decode_body_with_value_kind(
                        decoder: &mut D,
                        value_kind: sbor::ValueKind<radix_common::data::manifest::ManifestCustomValueKind>
                    ) -> Result<Self, sbor::DecodeError> {
                        use sbor::{self, Decode};
                        decoder.check_preloaded_value_kind(value_kind, sbor::ValueKind::Enum)?;
                        let discriminator = decoder.read_discriminator()?;
                        #[deny(unreachable_patterns)]
                        match discriminator {
                            0u8 => {
                                decoder.read_and_check_size(1usize)?;
                                Ok(Self::A {
                                    named: decoder.decode::<T>()?,
                                })
                            },
                            1u8 => {
                                decoder.read_and_check_size(1usize)?;
                                Ok(Self::B(decoder.decode::<String>()?,))
                            },
                            2u8 => {
                                decoder.read_and_check_size(0usize)?;
                                Ok(Self::C)
                            },
                            _ => Err(sbor::DecodeError::UnknownDiscriminator(discriminator))
                        }
                    }
                }
            },
        );
    }
}