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#![feature( type_ascription, box_patterns, proc_macro_quote, rustc_private, proc_macro_hygiene )] #[macro_use] extern crate quote; extern crate proc_macro; extern crate proc_macro2; extern crate syn; use proc_macro2::TokenStream; #[proc_macro_attribute] pub fn export( _args: proc_macro::TokenStream, input: proc_macro::TokenStream, ) -> proc_macro::TokenStream { let f: syn::ItemFn = syn::parse(input.clone()).expect("`export` can only be applied to a function"); let syn::ItemFn { ident, decl: box decl, vis, block, .. } = f.clone(); let syn::FnDecl { inputs, output, fn_token, .. } = decl; let new_inputs = rewrite_inputs_as_pointers(inputs.clone()); let result = inputs_to_pointers(output.clone(), inputs, block); let response = wrap_result(output, result); quote!( #[cfg(not(test))] #[no_mangle] #vis #fn_token #ident (#(#new_inputs),*) -> wasm_rpc::Pointer { #[cfg(debug_assertions)] wasm_rpc::hook(); #response } #[cfg(test)] #f ) .into() } #[proc_macro] pub fn require(input: proc_macro::TokenStream) -> proc_macro::TokenStream { let mut inputs: Vec<TokenStream> = macro_arguments(input.into()); let error = inputs.pop(); let condition = inputs.pop(); (quote!(if(!(#condition)){return Err(#error);})).into() } #[proc_macro] pub fn get(input: proc_macro::TokenStream) -> proc_macro::TokenStream { let inputs: Vec<TokenStream> = macro_arguments(input.into()); let key = concat_vecs(inputs); (quote!(wasm_rpc::get_memory(#key))).into() } #[proc_macro] pub fn set(input: proc_macro::TokenStream) -> proc_macro::TokenStream { let mut inputs: Vec<TokenStream> = macro_arguments(input.into()); let value = inputs.pop(); let key = concat_vecs(inputs); quote!(wasm_rpc::set_memory(#key, #value)).into() } #[proc_macro] pub fn load(input: proc_macro::TokenStream) -> proc_macro::TokenStream { let inputs: Vec<TokenStream> = macro_arguments(input.into()); let key = concat_vecs(inputs); (quote!(wasm_rpc::get_storage(#key))).into() } #[proc_macro] pub fn store(input: proc_macro::TokenStream) -> proc_macro::TokenStream { let mut inputs: Vec<TokenStream> = macro_arguments(input.into()); let value = inputs.pop(); let key = concat_vecs(inputs); quote!(wasm_rpc::set_storage(#key, #value)).into() } fn rewrite_inputs_as_pointers( inputs: syn::punctuated::Punctuated<syn::FnArg, syn::token::Comma>, ) -> Vec<TokenStream> { inputs .clone() .into_iter() .map(|input| match input.clone() { syn::FnArg::Captured(syn::ArgCaptured { pat, .. }) => quote!(#pat: wasm_rpc::Pointer), input => quote!(#input), }) .collect() } fn inputs_to_pointers( return_type: syn::ReturnType, inputs: syn::punctuated::Punctuated<syn::FnArg, syn::token::Comma>, block: Box<syn::Block>, ) -> TokenStream { let pointers = inputs .clone() .into_iter() .map(|input| match input.clone() { syn::FnArg::Captured(syn::ArgCaptured { pat: syn::Pat::Ident(syn::PatIdent { ident, .. }), ty: syn::Type::Path(syn::TypePath { path, .. }), .. }) => { let dref_fn = match quote!(#path).to_string().as_ref() { "BTreeMap < ObjectKey , Value >" => { quote!(wasm_rpc::Dereferenceable::to_object) } "String" => quote!(wasm_rpc::Dereferenceable::to_string), "Vec < u8 >" => quote!(wasm_rpc::Dereferenceable::to_bytes), "i64" => quote!(wasm_rpc::Dereferenceable::to_i64), "i32" => quote!(wasm_rpc::Dereferenceable::to_i64), "i16" => quote!(wasm_rpc::Dereferenceable::to_i64), "i8" => quote!(wasm_rpc::Dereferenceable::to_i64), "u64" => quote!(wasm_rpc::Dereferenceable::to_i64), "u32" => quote!(wasm_rpc::Dereferenceable::to_i64), "u16" => quote!(wasm_rpc::Dereferenceable::to_i64), "u8" => quote!(wasm_rpc::Dereferenceable::to_i64), _ => quote!(), }; let is_integer = match quote!(#path).to_string().as_ref() { "i64" => true, "i32" => true, "i16" => true, "i8" => true, "u64" => true, "u32" => true, "u16" => true, "u8" => true, _ => false, }; if is_integer { quote!(#dref_fn(&#ident) as #path) } else { quote!(#dref_fn(&#ident)) } } _ => quote!(), }) .collect::<Vec<TokenStream>>(); quote!((|#(#inputs),*|#return_type{#block})(#(#pointers),*)) } fn wrap_result(return_type: syn::ReturnType, result: TokenStream) -> TokenStream { match return_type.clone() { syn::ReturnType::Default => quote!( #result; wasm_rpc::Responsable::to_response(Ok(wasm_rpc::Value::Null)) ), syn::ReturnType::Type(syn::token::RArrow(_), box path) => { if quote!(#path).to_string().starts_with("Result") { quote!( wasm_rpc::Responsable::to_response((#result)) ) } else { quote!( wasm_rpc::Responsable::to_response(Ok(#result)) ) } } } } fn macro_arguments(tokens: TokenStream) -> Vec<TokenStream> { tokens .into_iter() .map(|token| { let tt: proc_macro2::TokenTree = token.into(); quote!(#tt) }) .collect::<Vec<TokenStream>>() .split(|token| match syn::parse(token.clone().into()) { Ok(syn::token::Comma { .. }) => true, _ => false, }) .map(|items| quote!(#(#items)*)) .collect() } fn concat_vecs(vecs: Vec<TokenStream>) -> TokenStream { let slices: Vec<TokenStream> = vecs .iter() .map(|argument| { let slice = match syn::parse(argument.clone().into()) { Ok(syn::LitStr { .. }) => quote!(#argument.as_bytes()), _ => quote!(#argument.as_slice()), }; quote!(#slice) }) .collect(); quote! { [#(#slices),*].concat() } }