bincode_derive-next 2.1.0

Implementation of #[derive(Encode, Decode)] for bincode-next
Documentation 
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mod attribute;
mod derive_enum;
mod derive_struct;

use attribute::ContainerAttributes;
use virtue::prelude::{AttributeAccess, Body, Parse, Result, TokenStream};

#[proc_macro_derive(Encode, attributes(bincode))]
pub fn derive_encode(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
    derive_encode_inner(input).unwrap_or_else(|e| e.into_token_stream())
}

/// # Errors
///
/// Returns an error if the input cannot be parsed or if the code generation fails.
fn derive_encode_inner(input: TokenStream) -> Result<TokenStream> {
    let parse = Parse::new(input)?;
    let (mut generator, attributes, body) = parse.into_generator();
    let attributes = attributes
        .get_attribute::<ContainerAttributes>()?
        .unwrap_or_default();

    match body {
        Body::Struct(body) => {
            derive_struct::DeriveStruct {
                fields: body.fields,
                attributes,
            }
            .generate_encode(&mut generator)?;
        }
        Body::Enum(body) => {
            derive_enum::DeriveEnum {
                variants: body.variants,
                attributes,
            }
            .generate_encode(&mut generator)?;
        }
    }

    generator.export_to_file("bincode_next", "Encode");
    generator.finish()
}

#[proc_macro_derive(Decode, attributes(bincode))]
pub fn derive_decode(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
    derive_decode_inner(input).unwrap_or_else(|e| e.into_token_stream())
}

/// # Errors
///
/// Returns an error if the input cannot be parsed or if the code generation fails.
fn derive_decode_inner(input: TokenStream) -> Result<TokenStream> {
    let parse = Parse::new(input)?;
    let (mut generator, attributes, body) = parse.into_generator();
    let attributes = attributes
        .get_attribute::<ContainerAttributes>()?
        .unwrap_or_default();

    match body {
        Body::Struct(body) => {
            derive_struct::DeriveStruct {
                fields: body.fields,
                attributes,
            }
            .generate_decode(&mut generator)?;
        }
        Body::Enum(body) => {
            derive_enum::DeriveEnum {
                variants: body.variants,
                attributes,
            }
            .generate_decode(&mut generator)?;
        }
    }

    generator.export_to_file("bincode_next", "Decode");
    generator.finish()
}

#[proc_macro_derive(BorrowDecode, attributes(bincode))]
pub fn derive_borrow_decode(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
    derive_borrow_decode_inner(input).unwrap_or_else(|e| e.into_token_stream())
}

/// # Errors
///
/// Returns an error if the input cannot be parsed or if the code generation fails.
fn derive_borrow_decode_inner(input: TokenStream) -> Result<TokenStream> {
    let parse = Parse::new(input)?;
    let (mut generator, attributes, body) = parse.into_generator();
    let attributes = attributes
        .get_attribute::<ContainerAttributes>()?
        .unwrap_or_default();

    match body {
        Body::Struct(body) => {
            derive_struct::DeriveStruct {
                fields: body.fields,
                attributes,
            }
            .generate_borrow_decode(&mut generator)?;
        }
        Body::Enum(body) => {
            derive_enum::DeriveEnum {
                variants: body.variants,
                attributes,
            }
            .generate_borrow_decode(&mut generator)?;
        }
    }

    generator.export_to_file("bincode_next", "BorrowDecode");
    generator.finish()
}