nimble-derive 0.2.0

Async friendly, simple and fast binary encoding/decoding
Documentation 
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use proc_macro2::TokenStream;
use quote::quote;
use syn::{punctuated::Iter, Data, Field, Ident, Variant};

use crate::util::{DataEnumExt, FieldsExt, FieldsType};

pub struct Context<'a> {
    pub name: &'a Ident,
    pub expr_type: ExprType<'a>,
    pub field_prefix: TokenStream,
}

pub enum ExprType<'a> {
    Struct {
        fields_type: FieldsType,
        fields: Iter<'a, Field>,
    },
    Enum {
        variants: Iter<'a, Variant>,
    },
}

impl<'a> Context<'a> {
    #[inline]
    pub fn new(name: &'a Ident, data: &'a mut Data) -> Self {
        match *data {
            Data::Struct(ref data) => {
                let fields_type = data.fields.get_type();
                let fields = data.fields.iter_fields();

                let expr_type = ExprType::Struct {
                    fields_type,
                    fields,
                };
                let field_prefix = quote!(&self.);

                Context {
                    name,
                    expr_type,
                    field_prefix,
                }
            }
            Data::Enum(ref mut data) => {
                data.name_unnamed();
                let variants = data.iter_variants();
                let expr_type = ExprType::Enum { variants };
                let field_prefix = quote!();

                Context {
                    name,
                    expr_type,
                    field_prefix,
                }
            }
            Data::Union(_) => panic!("`nimble::Encode` is not supported on unions"),
        }
    }
}