| const PYODIDE_URL = 'https://cdn.jsdelivr.net/pyodide/v0.26.4/full/'; |
|
|
| let pyodide = null; |
| let shimSource = ''; |
| let initPromise = null; |
|
|
| function post(message) { |
| self.postMessage(message); |
| } |
|
|
| async function init() { |
| if (pyodide) return pyodide; |
| if (initPromise) return initPromise; |
| initPromise = (async () => { |
| if (!shimSource) throw new Error('No Python shim was supplied.'); |
| importScripts(`${PYODIDE_URL}pyodide.js`); |
| if (typeof loadPyodide !== 'function') { |
| throw new Error('Pyodide did not initialise.'); |
| } |
| pyodide = await loadPyodide({ indexURL: PYODIDE_URL }); |
| pyodide.runPython(shimSource); |
| post({ type: 'ready' }); |
| return pyodide; |
| })(); |
| return initPromise; |
| } |
|
|
| self.onmessage = async (event) => { |
| const message = event.data || {}; |
| if (message.type === 'init') { |
| shimSource = message.shim || ''; |
| try { |
| await init(); |
| } catch (error) { |
| post({ type: 'fatal', error: String((error && error.stack) || error) }); |
| } |
| return; |
| } |
| if (message.type === 'run') { |
| try { |
| await init(); |
| pyodide.globals.set('__wfcad_code', message.code || ''); |
| const raw = pyodide.runPython( |
| 'import json; json.dumps(__wfcad_runtime.run(__wfcad_code))', |
| ); |
| post({ type: 'result', id: message.id, result: JSON.parse(raw) }); |
| } catch (error) { |
| post({ |
| type: 'error', |
| id: message.id, |
| error: String((error && error.message) || error), |
| }); |
| } |
| } |
| }; |
|
|
