1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82
/* * Copyright 2020 Fluence Labs Limited * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ //! Defines the #[fce] macro that should be used with all export functions, extern blocks. //! At now, It supports the following types that could be used as parameters in export or foreign //! functions: i8, i16, i32, i64, u8, u16, u32, u64, f32, f64, bool, String, Vec<u8>. Also struct //! where all fields are public and have aforementioned types could be used as parameters. In this //! case #[fce] should be also applied to this structs. //! //! # Examples //! //! This example shows how a function could be exported: //! ``` //! #[fce] //! pub fn greeting(name: String) -> String { //! format!("Hi {}", name) //! } //! ``` //! //! This more complex example shows how a function could be imported from another Wasm module //! and how a struct could be passed: //! //! ``` //! #[fce] //! struct HostReturnValue { //! pub error_code: i32, //! pub outcome: Vec<u8> //! } //! //! #[fce] //! pub fn read_ipfs_file(file_path: String) -> HostReturnValue { //! let hash = calculate_hash(file_path); //! ipfs(hash) //! } //! //! #[fce] //! #[link(wasm_import_module = "ipfs_node.wasm")] //! extern "C" { //! pub fn ipfs(file_hash: String) -> HostReturnValue; //! } //! //! ``` #![doc(html_root_url = "https://docs.rs/fluence-sdk-macro/0.2.13")] #![deny( dead_code, nonstandard_style, unused_imports, unused_mut, unused_unsafe, unreachable_patterns )] #![warn(rust_2018_idioms)] #![recursion_limit = "1024"] use fluence_sdk_wit::fce as fce_impl; use proc_macro::TokenStream; #[proc_macro_attribute] pub fn fce(_attr: TokenStream, input: TokenStream) -> TokenStream { // into converts proc_macro::TokenStream to proc_macro2::TokenStream match fce_impl(input.into()) { Ok(v) => v, // converts syn:error to proc_macro2::TokenStream Err(e) => e.to_compile_error(), } // converts proc_macro2::TokenStream to proc_macro::TokenStream .into() }