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|
use quote::quote;
use syn::{self, parse_macro_input};
use darling::{FromDeriveInput, FromField, FromMeta};
mod list;
mod map;
mod maplist;
#[derive(Debug, FromDeriveInput)]
#[darling(attributes(network), supports(struct_any))]
/// Derive to and from network methods for quassel objects
pub struct Network {
ident: syn::Ident,
attrs: Vec<syn::Attribute>,
/// Representation to choose for the network format
/// see Repr enum
repr: Repr,
}
#[derive(Debug, Clone, Copy, FromMeta)]
#[darling(default)]
pub enum Repr {
List,
Map,
Maplist,
}
impl Default for Repr {
fn default() -> Self {
Repr::List
}
}
// #[derive(Debug, Clone, Copy, FromMeta)]
// #[darling(default)]
// pub enum Variant {
// Variantlist,
// Stringlist,
// Variantmap,
// Default,
// }
// impl Default for Variant {
// fn default() -> Self {
// Self::Default
// }
// }
#[derive(Debug, FromField)]
#[darling(attributes(network))]
pub struct NetworkField {
ident: Option<syn::Ident>,
ty: syn::Type,
#[darling(default)]
rename: Option<String>,
#[darling(default)]
override_type: Option<String>,
/// Variant to encapsulate this field
/// VariantList (default) or StringList
#[darling(default)]
variant: Option<String>,
/// field is a nested network repr so
/// use to_network and from_network on it
#[darling(default)]
network: bool,
}
pub fn network(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
let input = parse_macro_input!(input as syn::DeriveInput);
// println!("{:#?}", input);
let network = Network::from_derive_input(&input).unwrap();
// println!("{:#?}", network);
let fields: Vec<NetworkField> = match &input.data {
syn::Data::Struct(data) => match &data.fields {
syn::Fields::Named(fields) => fields
.named
.iter()
.map(|field| NetworkField::from_field(field).expect("Could not parse field"))
.collect(),
_ => panic!("network: not a named field"),
},
_ => panic!("network: not a Struct"),
};
// println!("{:#?}", fields);
let name = &input.ident;
let to_network_impl_center = match network.repr {
// Repr::Aos => {}
Repr::Map => map::to(&fields),
Repr::Maplist => maplist::to(&fields),
Repr::List => list::to(&fields),
};
let from_network_impl_center = match network.repr {
// Repr::Aos => {}
Repr::Map => map::from(&fields),
Repr::Maplist => maplist::from(&fields),
Repr::List => list::from(&fields),
};
let network_impl_item = match network.repr {
Repr::Map => quote! {crate::primitive::VariantMap;},
Repr::Maplist => quote! {crate::primitive::VariantMap;},
Repr::List => quote! {crate::primitive::VariantList;},
};
let mut gen = quote! {
impl crate::message::signalproxy::Network for #name {
type Item = #network_impl_item
fn to_network(&self) -> Self::Item {
let mut res = Self::Item::new();
#(#to_network_impl_center)*
return res;
}
fn from_network(input: &mut Self::Item) -> Self {
Self {
#(#from_network_impl_center)*
}
}
}
};
if let Repr::Maplist | Repr::Map = network.repr {
let network_impl_item_vec = match network.repr {
Repr::Map => quote! {crate::primitive::VariantList;},
Repr::Maplist => quote! {crate::primitive::VariantMap;},
Repr::List => quote! {crate::primitive::VariantList;},
};
let to_network_impl_vec_center = match network.repr {
Repr::Maplist => maplist::to_vec(name, &fields),
Repr::Map => map::to_vec(name, &fields),
_ => unimplemented!(),
};
let from_network_impl_vec_center = match network.repr {
Repr::Maplist => maplist::from_vec(name, &fields),
Repr::Map => map::from_vec(name, &fields),
_ => unimplemented!(),
};
let vec = quote! {
impl crate::message::signalproxy::Network for Vec<#name> {
type Item = #network_impl_item_vec
fn to_network(&self) -> Self::Item {
#to_network_impl_vec_center
}
fn from_network(input: &mut Self::Item) -> Self {
#from_network_impl_vec_center
}
}
};
gen.extend(vec);
}
// println!("{}", gen);
gen.into()
}
fn get_field_type(field: &NetworkField) -> syn::Type {
if let Some(override_type) = &field.override_type {
gen_type(override_type)
} else {
field.ty.clone()
}
}
fn get_field_variant_type(field: &NetworkField) -> syn::Type {
match &field.variant {
Some(ty) => gen_type(&ty),
None => {
if let Some(override_type) = &field.override_type {
gen_type(override_type)
} else {
field.ty.clone()
}
}
}
}
fn gen_type(typ: &str) -> syn::Type {
syn::Type::from(syn::TypePath {
qself: None,
path: syn::Path {
leading_colon: None,
segments: {
let mut res =
syn::punctuated::Punctuated::<syn::PathSegment, syn::token::Colon2>::new();
res.push(syn::PathSegment {
ident: syn::Ident::new(typ, proc_macro2::Span::call_site()),
arguments: syn::PathArguments::None,
});
res
},
},
})
}
fn get_field_type_colon(mut ty: syn::Type) -> syn::Type {
match &mut ty {
syn::Type::Path(path) => {
let first_seg = path.path.segments.first_mut().unwrap();
match &mut first_seg.arguments {
syn::PathArguments::AngleBracketed(bracket) => {
bracket.colon2_token = Some(syn::parse_str("::").unwrap());
}
_ => (),
}
}
_ => (),
};
return ty;
}
|
