mirror of https://git.sr.ht/~stygianentity/bincode
50 lines
1.7 KiB
Rust
50 lines
1.7 KiB
Rust
extern crate proc_macro;
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mod derive_enum;
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mod derive_struct;
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mod error;
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use derive_enum::DeriveEnum;
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use derive_struct::DeriveStruct;
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use error::Error;
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use proc_macro::TokenStream;
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use syn::{parse_macro_input, DeriveInput};
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type Result<T = ()> = std::result::Result<T, Error>;
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#[proc_macro_derive(Encodable)]
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pub fn derive_encodable(input: TokenStream) -> TokenStream {
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let input = parse_macro_input!(input as DeriveInput);
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derive_encodable_inner(input).unwrap_or_else(|e| e.into_token_stream())
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}
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fn derive_encodable_inner(input: DeriveInput) -> Result<TokenStream> {
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match input.data {
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syn::Data::Struct(struct_definition) => {
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DeriveStruct::parse(input.ident, struct_definition).and_then(|str| str.to_encodable())
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}
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syn::Data::Enum(enum_definition) => {
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DeriveEnum::parse(input.ident, enum_definition).and_then(|str| str.to_encodable())
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}
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syn::Data::Union(_) => Err(Error::UnionNotSupported),
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}
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}
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#[proc_macro_derive(Decodable)]
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pub fn derive_decodable(input: TokenStream) -> TokenStream {
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let input = parse_macro_input!(input as DeriveInput);
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derive_decodable_inner(input).unwrap_or_else(|e| e.into_token_stream())
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}
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fn derive_decodable_inner(input: DeriveInput) -> Result<TokenStream> {
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match input.data {
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syn::Data::Struct(struct_definition) => {
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DeriveStruct::parse(input.ident, struct_definition).and_then(|str| str.to_decodable())
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}
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syn::Data::Enum(enum_definition) => {
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DeriveEnum::parse(input.ident, enum_definition).and_then(|str| str.to_decodable())
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}
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syn::Data::Union(_) => Err(Error::UnionNotSupported),
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}
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}
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