extern crate proc_macro;
extern crate syn;
#[macro_use]
extern crate quote;
use proc_macro::TokenStream;
use syn::{Field, DeriveInput};
use quote::Tokens;
mod mut_getters;
mod getters;
mod setters;
mod constructor;
mod functions;
#[proc_macro_derive(Functions, attributes(__function))]
pub fn functions(input: TokenStream) -> TokenStream {
let s = input.to_string();
let ast = syn::parse_derive_input(&s).expect("Couldn't parse for Functions");
let gen = produce_contructor(&ast, functions::implement);
println!("String Function : {}", gen);
gen.parse().unwrap()
}
#[proc_macro_derive(Constructor, attributes(__constructor))]
pub fn constructor(input: TokenStream) -> TokenStream {
let s = input.to_string();
let ast = syn::parse_derive_input(&s).expect("Couldn't parse for Contructor");
let gen = produce_contructor(&ast, constructor::implement);
println!("String constructor : {}", gen);
gen.parse().unwrap()
}
#[proc_macro_derive(Getters, attributes(get))]
pub fn getters(input: TokenStream) -> TokenStream {
let s = input.to_string();
let ast = syn::parse_derive_input(&s).expect("Couldn't parse for getters");
let gen = produce(&ast, getters::implement);
println!("String Getters : {}", gen);
gen.parse().unwrap()
}
#[proc_macro_derive(MutGetters, attributes(get_mut))]
pub fn mut_getters(input: TokenStream) -> TokenStream {
let s = input.to_string();
let ast = syn::parse_derive_input(&s).expect("Couldn't parse for getters");
let gen = produce(&ast, mut_getters::implement);
println!("String MutGetters : {}", gen);
gen.parse().unwrap()
}
#[proc_macro_derive(Setters, attributes(set))]
pub fn setters(input: TokenStream) -> TokenStream {
let s = input.to_string();
let ast = syn::parse_derive_input(&s).expect("Couldn't parse for setters");
let gen = produce(&ast, setters::implement);
println!("String Setters : {}", gen);
gen.parse().unwrap()
}
fn produce(ast: &DeriveInput, worker: fn(&Field) -> Tokens) -> Tokens {
let name = &ast.ident;
let generics = &ast.generics;
let (impl_generics, ty_generics, where_clause) = generics.split_for_impl();
if let syn::Body::Struct(syn::VariantData::Struct(ref fields)) = ast.body {
let generated = fields.iter().map(worker).collect::<Vec<_>>();
quote! {
impl #impl_generics #name #ty_generics #where_clause {
#(#generated)*
}
}
} else {
panic!("#[derive(Getters)] is only defined for structs, not for enums!");
}
}
fn produce_contructor(ast: &DeriveInput, worker: fn(&Field, &String) -> Tokens) -> Tokens {
let name = &ast.ident;
let generics = &ast.generics;
let (impl_generics, ty_generics, where_clause) = generics.split_for_impl();
if let syn::Body::Struct(syn::VariantData::Struct(ref fields)) = ast.body {
let classname = format!("{}", ast.ident);
let generated = fields.iter().map(|x| { (
worker(x, &classname)
) }).collect::<Vec<_>>();
quote! {
impl #impl_generics #name #ty_generics #where_clause {
#(#generated)*
}
}
} else {
panic!("#[derive(Getters)] is only defined for structs, not for enums!");
}
}