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Arthur Schuster
2025-08-07 21:10:17 +02:00
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.gitignore vendored Normal file
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/target/

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Cargo.lock generated Normal file
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Cargo.toml Normal file
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[package]
description = "Example of running cel-rust interpreter in browser"
edition = "2024"
name = "cel_js_example"
publish = false
version = "0.0.0"
[dependencies]
cel = "0.11.0"
[lib]
crate-type = ["cdylib", "rlib"]

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target/wasm32-unknown-unknown/release/cel_js_example.wasm

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index.html Normal file
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<!doctype html>
<html lang="en-US">
<head>
<meta charset="utf-8" />
<title>Starlark evaluator</title>
<style type="text/css">
body {
font-family: sans-serif;
}
textarea {
width: calc(100% - 20px);
height: 20em;
box-sizing: border-box;
margin: 5px;
border-radius: 3px;
padding: 5px;
border-color: lightgray;
}
</style>
</head>
<body>
<script>
function run() {
WebAssembly.instantiateStreaming(fetch("cel_js_example.wasm"), {}).then(({ instance }) => {
const readString = (offset) => {
const memory = instance.exports.memory.buffer;
const length = new Uint32Array(memory, offset, 1)[0];
const characters = new Uint8Array(memory, offset + 4, length);
return new TextDecoder().decode(characters);
};
const readU8 = (offset) => {
return new Uint8Array(instance.exports.memory.buffer, offset, 1)[0];
};
const writeString = (s) => {
const encoded = new TextEncoder().encode(s.trim());
const offset = instance.exports.allocation(4 + encoded.byteLength);
// TODO(april): this probably isn't guaranteed to be 4-byte aligned? Might need to fix.
const memory = instance.exports.memory.buffer;
const uint32s = new Uint32Array(memory, offset, 1);
uint32s[0] = encoded.byteLength;
const uint8s = new Uint8Array(memory, offset + 4, encoded.byteLength);
uint8s.set(encoded);
return offset;
};
const content = document.getElementById("input").value;
const offset = instance.exports.evaluate(writeString(content));
const ok = readU8(offset) != 0;
const result = readString(offset + 4);
const output = document.getElementById("output");
output.value = (ok ? "" : "ERROR\n") + result;
});
}
window.addEventListener("load", function () {
document.getElementById("input").addEventListener("input", run, false);
run()
})
</script>
<h1>Starlark evaluator</h1>
<p>
Using <a href="https://github.com/cel-rust/cel-rust">cel-rust</a> compiled to web assembly.
Change the input to see it update.
</p>
<textarea id="input">
"Hello " + "world!"</textarea>
<textarea id="output" readonly="readonly" style="background-color: lightgray;">
</textarea>
</body>
</html>

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src/lib.rs Normal file
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use std::mem;
use std::slice;
use std::str;
use cel::{Context, ExecutionError, Program, Value};
#[unsafe(no_mangle)]
pub extern "C" fn allocation(n: usize) -> *mut u8 {
mem::ManuallyDrop::new(Vec::with_capacity(n)).as_mut_ptr()
}
#[unsafe(no_mangle)]
pub unsafe extern "C" fn evaluate(s: *const u8) -> *mut u8 {
unsafe {
let length = u32::from_le_bytes(*(s as *const [u8; 4])) as usize;
let input = slice::from_raw_parts(s.offset(4), length);
let output = evaluate_buffers(input);
mem::ManuallyDrop::new(output).as_mut_ptr()
}
}
fn evaluate_buffers(input: &[u8]) -> Vec<u8> {
let contents = str::from_utf8(input).unwrap();
let result = evaluate_cel(contents);
let success = result.is_ok();
let message = result.unwrap_or_else(|e| e.to_string());
let len = message.len();
let mut buffer = Vec::with_capacity(len + 8);
buffer.push(if success { 1 } else { 0 });
buffer.extend(vec![0; 3]);
buffer.extend_from_slice(&(len as u32).to_le_bytes());
buffer.extend_from_slice(message.as_bytes());
buffer
}
fn evaluate_cel(content: &str) -> Result<String, ExecutionError> {
let program = Program::compile(content).unwrap();
let mut context = Context::default();
// context.add_function("add", |a: i64, b: i64| a + b);
let value = program.execute(&context)?;
Ok(format!("{:?}", value))
}