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use std::iter::{self, Once}; use proc_macro::{Delimiter, Group, Ident, Punct, Spacing, Span, TokenStream, TokenTree}; use proc_macro_error::{abort, abort_call_site, proc_macro_error}; #[proc_macro] #[proc_macro_error] pub fn get(path: TokenStream) -> TokenStream { let method: TokenStream = "&::solarsail::http::Method::GET".parse().unwrap(); method_macro(method, path) } #[proc_macro] #[proc_macro_error] pub fn head(path: TokenStream) -> TokenStream { let method: TokenStream = "&::solarsail::http::Method::HEAD".parse().unwrap(); method_macro(method, path) } #[proc_macro] #[proc_macro_error] pub fn post(path: TokenStream) -> TokenStream { let method: TokenStream = "&::solarsail::http::Method::POST".parse().unwrap(); method_macro(method, path) } #[proc_macro] #[proc_macro_error] pub fn put(path: TokenStream) -> TokenStream { let method: TokenStream = "&::solarsail::http::Method::PUT".parse().unwrap(); method_macro(method, path) } #[proc_macro] #[proc_macro_error] pub fn delete(path: TokenStream) -> TokenStream { let method: TokenStream = "&::solarsail::http::Method::DELETE".parse().unwrap(); method_macro(method, path) } #[proc_macro] #[proc_macro_error] pub fn patch(path: TokenStream) -> TokenStream { let method: TokenStream = "&::solarsail::http::Method::PATCH".parse().unwrap(); method_macro(method, path) } #[proc_macro] #[proc_macro_error] pub fn route(path: TokenStream) -> TokenStream { let mut path = path.into_iter(); let method = (&mut path) .take_while(|token| { match token { TokenTree::Punct(p) => { match p.as_char() { ',' => false, '/' => abort_call_site!( "route! macro must contain a pattern matching expected methods as its first argument" ), _ => true } } _ => true } }) .collect(); method_macro(method, path.collect()) } fn method_macro(method: TokenStream, path: TokenStream) -> TokenStream { let mut expect_slash = false; let path: TokenStream = if path.is_empty() { iter::once(TokenTree::Ident(Ident::new("_", Span::call_site()))).collect() } else { punct_once('&') .chain(iter::once(TokenTree::Group(Group::new( Delimiter::Bracket, path.into_iter() .enumerate() .filter_map(|(i, item)| { Some(match item { TokenTree::Group(g) => abort!(g.span(), "unexpected group"), item @ TokenTree::Ident(_) => { expect_slash = true; item } TokenTree::Punct(p) if p.as_char() == '/' => { if i == 0 { return None; } if !expect_slash { abort!(p.span(), "unexpected forward slash") } expect_slash = false; TokenTree::Punct(Punct::new(',', Spacing::Alone)) } TokenTree::Punct(p) => { if p.spacing() == Spacing::Alone { expect_slash = true; } TokenTree::Punct(p) } literal @ TokenTree::Literal(_) => { expect_slash = true; literal } }) }) .collect(), )))) .collect() }; let result: TokenStream = TokenTree::Group(Group::new( Delimiter::Parenthesis, method .into_iter() .chain(punct_once(',')) .chain(path) .collect(), )) .into(); result } fn punct_once(ch: char) -> Once<TokenTree> { iter::once(TokenTree::Punct(Punct::new(ch, Spacing::Alone))) }