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extern crate proc_macro;
extern crate proc_macro2;
#[macro_use]
extern crate syn;
#[macro_use]
extern crate quote;
use proc_macro::TokenStream;
use syn::{
parse::{Parse, ParseStream, Result},
DeriveInput, ItemFn, ItemStruct, LitStr, Token,
};
#[proc_macro_attribute]
pub fn db_test(_metadata: TokenStream, input: TokenStream) -> TokenStream {
let fn_item: ItemFn = parse_macro_input!(input as ItemFn);
let fn_ident = fn_item.ident;
let visibility = fn_item.vis;
let _inputs = fn_item.decl.inputs;
let output = fn_item.decl.output;
let block = fn_item.block;
(quote!{
#[test]
#visibility fn #fn_ident() #output {
db_test(|conn|{
#block
})
}
}).into()
}
#[derive(Debug)]
struct PathArgs {
id: String,
}
mod keyword {
syn::custom_keyword!(id);
}
impl Parse for PathArgs {
fn parse(input: ParseStream) -> Result<Self> {
input.parse::<keyword::id>()?;
input.parse::<Token![=]>()?;
let path: LitStr = input.parse()?;
Ok(PathArgs { id: path.value() })
}
}
#[proc_macro_attribute]
pub fn realm_page(meta: TokenStream, input: TokenStream) -> TokenStream {
let id = parse_macro_input!(meta as PathArgs).id;
let input_clone = input.clone();
let derive_input = parse_macro_input!(input_clone as DeriveInput);
let struct_item: ItemStruct = parse_macro_input!(input as ItemStruct);
let ident = struct_item.ident;
let q = quote!{
#[derive(Serialize)]
#derive_input
impl realm::Page for #ident {
const ID: &'static str = #id;
}
};
q.into()
}