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use proc_macro::TokenStream;
use proc_macro2::{Span, TokenStream as TokenStream2};
use quote::{quote, ToTokens};
use syn::{parse::Parser, punctuated::Punctuated, spanned::Spanned, Ident, Token};
use crate::{util::logic::Logic, web::routing::Method};
pub(crate) fn impl_macro_api_doc(attr: TokenStream, item: TokenStream) -> TokenStream {
let expand = TokenStream2::from(attr);
let item_fn = syn::parse_macro_input!(item as syn::ItemFn);
// no check
Logic::generate(|| {
// Get Method and Path
let (http_method, path) = match item_fn.attrs.iter().find(|attr| {
match attr.path().get_ident() {
Some(ident) => Method::values().iter().any(|mapping| ident == mapping),
None => false,
}
}) {
Some(attr) => {
let span = attr.path().span();
let ident = match attr.path().get_ident() {
Some(ident) => ident.to_string(),
None => return Err(syn::Error::new(span.clone(), "Invalid attribute path")),
};
let mapping = ident.trim_end();
let method = match mapping
.split_once("_")
.map(|(s, _)| s.trim())
.map(|s| s.to_lowercase())
.map(|s| match s.as_str() {
"any" => 1,
"request" => 2,
_ => 0,
})
.unwrap_or(0)
{
1 => {
Some(quote! { method(get, post, put, delete, options, head, patch, trace)})
}
2 => None,
_ => {
let method = match Method::parse_mapping(mapping) {
#[rustfmt::skip]
Ok(method) => Ident::new(method.as_lowercase_str(), span.clone()).to_token_stream(),
Err(err) => return Err(syn::Error::new(span.clone(), err)),
};
Some(method)
}
};
let list = match attr.meta.require_list() {
Ok(list) => list,
Err(err) => return Err(err),
};
let parser = Punctuated::<syn::MetaNameValue, Token![,]>::parse_terminated;
let name_values = match parser.parse2(list.tokens.clone()) {
Ok(name_values) => name_values,
Err(err) => return Err(err),
};
let http_method = match method {
Some(method) => method,
None => {
match name_values
.iter()
.find(|item| item.path.is_ident("method"))
.map(|item| {
if let syn::Expr::Lit(expr) = &item.value {
if let syn::Lit::Str(lit) = &expr.lit {
let value = lit.value();
if !value.is_empty() {
return Some(value);
}
}
}
None
})
.unwrap_or_default()
{
Some(method) => Ident::new(&method.to_lowercase(), Span::call_site())
.to_token_stream(),
None => {
return Err(syn::Error::new(list.span(), "Missing HTTP method."))
}
}
}
};
let path = match name_values
.into_iter()
.find(|item| item.path.is_ident("path"))
.map(|item| {
if let syn::Expr::Lit(expr) = &item.value {
if let syn::Lit::Str(lit) = &expr.lit {
if !lit.value().is_empty() {
return Some(item.clone());
}
}
}
None
})
.unwrap_or_default()
{
Some(path) => path,
None => return Err(syn::Error::new(span, "Path attribute is required")),
};
(http_method, path)
}
None => return Ok(quote! {}),
};
let expanded = quote! {
#[::utoipa::path(
#http_method,
#path,
#expand
)]
#item_fn
};
// println!("expanded: {}", expanded.to_string());
Ok(expanded)
})
}