js-bindgen

The project is very ALPHA right now, but it is generating some very basic bindings for Rust and C right now

Generate WebAssembly bindings to JavaSCript via js-wasm for various languages:

• Rust
• C

cargo install js-bindgen

Getting Started

This project is able to take JavaScript API descriptions in yaml like the one below:

```yaml

Bindings to web console

• name: console functions:
  • name: clear
  • name: log parameters:
    • name: msg parametertype: string
  • name: warn friendlyname: warning parameters:
    • name: msg parametertype: string
  • name: error parameters:
    • name: msg parametertype: string
  • name: time parameters:
    • name: msg parametertype: string
  • name: timeEnd parameters:
    • name: msg parametertype: string

```

And turn them into code.

Rust

js-bindgen --lang rust console.yaml

```rust

![no_std]

pub mod console { use js::*;

pub fn clear(){
    let func = js!(r###"function(){
            console.clear();
        }"###);
    func.invoke_0();
}

pub fn log(msg: &str){
    let a0 = msg.as_ptr() as u32;
    let a1 = msg.len() as u32;
    let func = js!(r###"function(msgPtr,msgLen){
            console.log(this.readUtf8FromMemory(msgPtr,msgLen));
        }"###);
    func.invoke_2(a0, a1);
}

... ```

C

js-bindgen --lang c console.yaml

```C

include "js-wasm.h"

void consoleclear(){ static int fn; char *fncode = "function(){ console.clear(); }"; if(fn == 0){ fn = jsregisterfunction(fncode,jsstrlen(fncode)); } jsinvokefunction0(fn); }

void consolelog(char * msg){ static int fn; unsigned int a0 = (unsigned int)msg; unsigned int a1 = jsstrlen(msg); char *fncode = "function(msgPtr,msgLen){ console.log(this.readUtf8FromMemory(msgPtr,msgLen)); }"; if(fn == 0){ fn = jsregisterfunction(fncode,jsstrlen(fncode)); } jsinvokefunction_2(fn, a0, a1); }

... ```

Custom Code

Sometimes you may want to create a binding to code that doesn't exist and still have the power to generate libraries for many targets

yaml - namespace: unicorn functions: makeUnicorns: code: | function() { console.log("🦄🦄🦄") }