With this combination it is fairly easy to get things done in Rust and utilize it in JavaScript. Yay!
Forked from asaaki/0___rust_serde_json_wasm_parcel___0.md
Created
January 26, 2018 17:18
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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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