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use ngyn_shared::server::Method;
use proc_macro::TokenStream;
use quote::quote;
use syn::{ItemImpl, Signature};
/// Path Enum
///
/// This enum represents the possible types of paths that can be used in the application.
/// It can either be a Single path represented as a String or Multiple paths represented as a Vector of Strings.
#[derive(Debug, Clone)]
pub(super) enum RoutePath {
/// Represents a single path as a String
Single(String),
/// Represents multiple paths as a Vector of Strings
Multiple(Vec<String>),
}
impl RoutePath {
pub fn each<F>(&self, mut f: F)
where
F: FnMut(&str),
{
match self {
RoutePath::Single(path) => f(path),
RoutePath::Multiple(paths) => paths.iter().for_each(|path| f(path)),
}
}
}
pub(super) struct PathArg {
pub path: Option<RoutePath>,
}
impl syn::parse::Parse for PathArg {
fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
let path = if input.peek(syn::LitStr) {
let path = input.parse::<syn::LitStr>()?;
Some(RoutePath::Single(path.value()))
} else if input.peek(syn::token::Bracket) {
let content;
syn::bracketed!(content in input);
let mut paths = Vec::new();
while !content.is_empty() {
let path = content.parse::<syn::LitStr>()?;
paths.push(path.value());
if !content.is_empty() {
content.parse::<syn::Token![,]>()?;
}
}
Some(RoutePath::Multiple(paths))
} else {
None
};
Ok(PathArg { path })
}
}
pub(super) struct RouteArgs {
pub path: Option<RoutePath>,
pub http_method: String,
}
impl syn::parse::Parse for RouteArgs {
fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
let http_method = input.parse::<syn::LitStr>()?.value();
if Method::from_bytes(http_method.as_bytes()).is_err() {
panic!("Unsupported HTTP method: {}", http_method)
} else {
input.parse::<syn::Token![,]>()?;
}
let PathArg { path } = input.parse::<PathArg>()?;
Ok(RouteArgs { path, http_method })
}
}
struct CheckArgs {
gates: Vec<syn::Path>,
}
impl syn::parse::Parse for CheckArgs {
fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
let mut gates = vec![];
while !input.is_empty() {
let path: syn::Path = input.parse()?;
gates.push(path);
if !input.is_empty() {
input.parse::<syn::Token![,]>()?;
}
}
if gates.is_empty() {
return Err(syn::Error::new(input.span(), "expected at least one gate"));
}
Ok(Self { gates })
}
}
pub(crate) fn routes_macro(raw_input: TokenStream) -> TokenStream {
let ItemImpl {
items,
attrs,
defaultness,
unsafety,
impl_token,
generics,
trait_,
self_ty,
..
} = match syn::parse::<ItemImpl>(raw_input) {
Ok(input) => input,
Err(_err) => panic!("Only impl blocks are supported"),
};
if let Some((..)) = trait_ {
panic!("Trait impls are not supported");
}
let mut route_defs: Vec<_> = Vec::new();
let mut handle_routes: Vec<_> = Vec::new();
for item in items.clone() {
if let syn::ImplItem::Fn(method) = item {
for attr in method.attrs.clone() {
if attr.path().is_ident("route")
|| attr.path().is_ident("get")
|| attr.path().is_ident("post")
|| attr.path().is_ident("put")
|| attr.path().is_ident("delete")
|| attr.path().is_ident("patch")
|| attr.path().is_ident("head")
{
let (path, http_method) = {
if attr.path().is_ident("route") {
let RouteArgs { path, http_method } =
attr.parse_args::<RouteArgs>().unwrap();
(path, http_method)
} else {
let PathArg { path } = attr.parse_args::<PathArg>().unwrap();
let http_method =
attr.path().get_ident().unwrap().to_string().to_uppercase();
(path, http_method)
}
};
path.unwrap().each(|path| {
let Signature {
ident,
inputs,
asyncness,
output,
..
} = method.sig.clone();
let ident_str = ident.to_string();
route_defs.push(quote! {(
#path,
#http_method,
#ident_str,
)});
let args = inputs.iter().fold(None, |args, input| {
if let syn::FnArg::Typed(pat) = input {
let ty = &pat.ty;
let (path, and_token, mutability) = {
if let syn::Type::Reference(path_ref) = *ty.clone() {
if let syn::Type::Path(path) = *path_ref.elem.clone() {
(
path.path,
Some(path_ref.and_token),
path_ref.mutability,
)
} else {
panic!("Expected a reference or a path");
}
} else if let syn::Type::Path(path) = *ty.clone() {
(path.path, None, None)
} else {
panic!("Expected a reference or a path");
}
};
let arg_def = quote! {
#and_token #mutability ngyn::prelude::Transducer::reduce::<#and_token #mutability #path>(cx, res)
};
if args.is_none() {
Some(quote! {
#arg_def
})
} else {
Some(quote! {
#args, #arg_def
})
}
} else {
args
}
});
let http_code = method.attrs.iter().find_map(|attr| {
if attr.path().is_ident("http_code") {
Some(attr.meta.clone())
} else {
None
}
});
let http_code = match http_code {
Some(http_code) => quote! {
match ngyn::http::StatusCode::from_u16(#http_code) {
Ok(status) => {
*res.status_mut() = status;
}
Err(_) => {
// TODO: add a log here
*res.status_mut() = ngyn::http::StatusCode::INTERNAL_SERVER_ERROR;
}
}
},
None => quote! {},
};
let gates = method.attrs.iter().filter_map(|attr| {
if attr.path().is_ident("check") {
Some(attr.meta.clone())
} else {
None
}
});
let gate_handlers: Vec<_> = gates
.map(|gate| {
if let syn::Meta::List(path) = gate {
let CheckArgs { gates } =
path.parse_args::<CheckArgs>().unwrap();
gates.iter().fold(quote! {}, |gates, path| {
quote! {
#gates
{
use ngyn::prelude::NgynGate;
let mut gate = #path::default();
gate.inject(cx);
if !gate.can_activate(cx, res).await {
return;
}
}
}
})
} else {
panic!("Expected a list of gates")
}
})
.collect();
let handle_body = if asyncness.is_some() {
match output {
syn::ReturnType::Type(_, _) => quote! {
let body = self.#ident(#args).await;
*res.body_mut() = body.to_bytes().into();
},
_ => quote! {
self.#ident(#args).await;
},
}
} else {
match output {
syn::ReturnType::Type(_, _) => quote! {
let body = self.#ident(#args);
*res.body_mut() = body.to_bytes().into();
},
_ => quote! {
self.#ident(#args);
},
}
};
handle_routes.push(quote! {
#ident_str => {
#http_code
#(#gate_handlers)*
#handle_body
}
});
})
}
}
}
}
let expanded = quote! {
#defaultness #unsafety #(#attrs)*
#impl_token #generics #self_ty {
const ROUTES: &'static [(&'static str, &'static str, &'static str)] = &[
#(#route_defs),*
];
#(#items)*
}
#impl_token #generics #self_ty {
async fn __handle_route(
&mut self,
handler: &str,
cx: &mut ngyn::prelude::NgynContext,
res: &mut ngyn::prelude::NgynResponse
) {
use ngyn::shared::server::ToBytes;
*res.status_mut() = ngyn::http::StatusCode::CREATED;
match handler {
#(#handle_routes),*
_ => {}
}
}
}
};
expanded.into()
}