With this combination it is fairly easy to get things done in Rust and utilize it in JavaScript. Yay!
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January 28, 2023 14:14
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Rust-to-JS JSON string exchange (parcel.js, wasm)
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| [package] | |
| name = "jane" | |
| version = "0.1.0" | |
| [lib] | |
| crate-type = ["cdylib"] | |
| [dependencies] | |
| serde = "1.0" | |
| serde_derive = "1.0" | |
| serde_json = "1.0" |
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| <html> | |
| <head><title>jane</title></head> | |
| <body> | |
| <script src="./index.js"></script> | |
| <pre id='console'>...</pre> | |
| </body> | |
| </html> |
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| import { memory, get_data, get_data_len } from "./src/lib.rs"; | |
| const offset = get_data(); | |
| const stringBuffer = new Uint8Array(memory.buffer, offset, get_data_len()); | |
| let str = ""; | |
| for (let i = 0; i < stringBuffer.length; i++) { | |
| str += String.fromCharCode(stringBuffer[i]); | |
| } | |
| let jane = JSON.parse(str); | |
| console.log("jane:", jane); | |
| let div = document.getElementById('console'); | |
| div.innerText = ` | |
| (rust string)->(JSON.parse)->(JSON.stringify) | |
| => ${JSON.stringify(jane)} | |
| `; |
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| // file: src/lib.rs | |
| extern crate serde; | |
| extern crate serde_json; | |
| #[macro_use] | |
| extern crate serde_derive; | |
| use std::ffi::CString; | |
| use std::os::raw::c_char; | |
| #[no_mangle] | |
| pub fn get_data() -> *mut c_char { | |
| let s = CString::new(jane()).unwrap(); | |
| s.into_raw() | |
| } | |
| #[no_mangle] | |
| pub fn get_data_len() -> usize { | |
| jane().len() | |
| } | |
| #[derive(Serialize, Deserialize)] | |
| struct Person { | |
| name: String, | |
| age: u8 | |
| } | |
| fn jane() -> String { | |
| let jane = Person { name: "Jane".to_string(), age: 35 }; | |
| let json = serde_json::to_string(&jane); | |
| json.unwrap() | |
| } |
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