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extern crate proc_macro;
extern crate proc_macro2;
extern crate proc_macro_hack;
extern crate quote;
extern crate syn;
use proc_macro::TokenStream;
use proc_macro2::Span;
use proc_macro_hack::proc_macro_hack;
use quote::quote;
use syn::*;
#[proc_macro_hack]
pub fn routes(item: TokenStream) -> TokenStream {
use syn::parse::Parser;
let paths = <punctuated::Punctuated<Path, token::Comma>>::parse_terminated.parse(item).unwrap();
let parts = paths
.iter()
.map(|path| {
let mut fn_name_path = path.clone();
{
let mut last_seg = fn_name_path.segments.last_mut().unwrap();
last_seg.value_mut().ident = Ident::new(
&format!(
"RESET_ROUTER_ROUTE_PARTS_FOR_{}",
last_seg.value().ident.to_string().trim_start_matches("r#").to_owned()
),
Span::call_site(),
);
}
let fn_name_path = &fn_name_path;
quote!({
let (method, regex, priority) = #fn_name_path();
(method, regex, priority, #path.into())
})
})
.collect::<Vec<_>>();
let out = quote!(vec![#(#parts),*]);
out.into()
}
#[proc_macro_attribute]
pub fn options(attrs: TokenStream, item: TokenStream) -> TokenStream {
named_route(attrs, item, "OPTIONS")
}
#[proc_macro_attribute]
pub fn get(attrs: TokenStream, item: TokenStream) -> TokenStream {
named_route(attrs, item, "GET")
}
#[proc_macro_attribute]
pub fn post(attrs: TokenStream, item: TokenStream) -> TokenStream {
named_route(attrs, item, "POST")
}
#[proc_macro_attribute]
pub fn put(attrs: TokenStream, item: TokenStream) -> TokenStream {
named_route(attrs, item, "PUT")
}
#[proc_macro_attribute]
pub fn delete(attrs: TokenStream, item: TokenStream) -> TokenStream {
named_route(attrs, item, "DELETE")
}
#[proc_macro_attribute]
pub fn head(attrs: TokenStream, item: TokenStream) -> TokenStream {
named_route(attrs, item, "HEAD")
}
#[proc_macro_attribute]
pub fn trace(attrs: TokenStream, item: TokenStream) -> TokenStream {
named_route(attrs, item, "TRACE")
}
#[proc_macro_attribute]
pub fn connect(attrs: TokenStream, item: TokenStream) -> TokenStream {
named_route(attrs, item, "CONNECT")
}
#[proc_macro_attribute]
pub fn patch(attrs: TokenStream, item: TokenStream) -> TokenStream {
named_route(attrs, item, "PATCH")
}
#[proc_macro_attribute]
pub fn route(attrs: TokenStream, item: TokenStream) -> TokenStream {
let attrs = parse_macro_input!(attrs as AttributeArgs);
route_inner(attrs, item)
}
fn named_route(attrs: TokenStream, item: TokenStream, method: &str) -> TokenStream {
let attrs = parse_macro_input!(attrs as AttributeArgs);
let mut new_attrs = Vec::with_capacity(attrs.len());
for attr in attrs.into_iter() {
if let NestedMeta::Literal(ref lit) = attr {
new_attrs.push(NestedMeta::Meta(Meta::NameValue(parse_quote!(path=#lit))));
} else {
new_attrs.push(attr);
}
}
new_attrs.push(NestedMeta::Meta(Meta::NameValue(parse_quote!(methods=#method))));
route_inner(new_attrs, item)
}
fn route_inner(attrs: AttributeArgs, item: TokenStream) -> TokenStream {
let item = parse_macro_input!(item as ItemFn);
let params = attrs
.iter()
.filter_map(|x| match x {
NestedMeta::Meta(y) => Some(y),
_ => None,
})
.filter_map(|x| match x {
Meta::NameValue(y) => Some(y),
_ => None,
});
let regex_str = params
.clone()
.find(|x| x.ident == "path")
.and_then(|x| match x.lit {
Lit::Str(ref y) => Some(y),
_ => None,
})
.map(|x| x.value())
.expect("No path provided");
let methods_str = params
.clone()
.find(|x| x.ident == "methods")
.and_then(|x| match x.lit {
Lit::Str(ref y) => Some(y),
_ => None,
})
.map(|x| x.value())
.unwrap_or_else(|| "".into());
let priority_int = params
.clone()
.find(|x| x.ident == "priority")
.and_then(|x| match x.lit {
Lit::Int(ref y) => Some(y),
_ => None,
})
.map(|x| x.value() as u8)
.unwrap_or_else(|| 0);
let method_bits = {
let mut method_iter = methods_str.split(',').map(|x| x.trim().to_lowercase());
let cls = |s: &str| match s {
"options" => quote!(reset_router::bits::Method::OPTIONS),
"get" => quote!(reset_router::bits::Method::GET),
"post" => quote!(reset_router::bits::Method::POST),
"put" => quote!(reset_router::bits::Method::PUT),
"delete" => quote!(reset_router::bits::Method::DELETE),
"head" => quote!(reset_router::bits::Method::HEAD),
"trace" => quote!(reset_router::bits::Method::TRACE),
"connect" => quote!(reset_router::bits::Method::CONNECT),
"patch" => quote!(reset_router::bits::Method::PATCH),
_ => panic!("Unknown method parameter"),
};
let first = method_iter.next();
match first {
Some(m) => {
let base = cls(&m);
method_iter.fold(base, |acc, val| {
let val = cls(&val);
quote!(#acc | #val)
})
}
_ => quote!(reset_router::bits::Method::all()),
}
};
let fn_name = Ident::new(
&format!(
"RESET_ROUTER_ROUTE_PARTS_FOR_{}",
item.ident.to_string().trim_start_matches("r#").to_owned()
),
Span::call_site(),
);
let out = quote! {
#item
pub fn #fn_name() -> (u32, &'static str, u8) {
((#method_bits).bits(), #regex_str, #priority_int)
}
};
out.into()
}