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Define JavaScript class inside Golang (WebAssembly)
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| import 'vendor/tinygo' | |
| const go = new Go(); | |
| go.importObject.env['main.defineClass'] = function(namePtr, nameLen, cPtr, cGcPtr, pPtr/*, pGcPtr*/) { | |
| const mem = new DataView(go._inst.exports.memory.buffer) | |
| const decoder = new TextDecoder("utf-8"); | |
| const name = decoder.decode(new DataView(go._inst.exports.memory.buffer, namePtr, nameLen)); | |
| const constructorID = mem.getUint32(cPtr, true) | |
| const constructor = go._values[constructorID] | |
| const prototypeID = mem.getUint32(pPtr, true) | |
| const prototypes = go._values[prototypeID] | |
| window[name] = (new Function( | |
| 'constructor', 'prototypes', | |
| ` | |
| function ${name}() { | |
| if(!(this instanceof ${name})) { | |
| throw new TypeError("Cannot call a class as a function") | |
| } | |
| return constructor.apply(this, arguments) | |
| } | |
| prototypes.call(${name}.prototype) | |
| return ${name} | |
| ` | |
| ))(constructor, prototypes); | |
| } | |
| WebAssembly | |
| .instantiateStreaming( | |
| fetch(require('./main.wasm')), | |
| go.importObject, | |
| ) | |
| .then(result => { | |
| go.run(result.instance); | |
| }); |
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| package main | |
| func defineClass(name string, constructor js.Value) | |
| func pointGetX(this js.Value, []inputs js.Value) interface{} { | |
| return this.Get("x") | |
| } | |
| func pointConstructor(this js.Value, []inputs js.Value) interface{} { | |
| this.Set("x", inputs[0]) | |
| this.Set("y", inputs[1]) | |
| return this; | |
| } | |
| func pointPrototype(this js.Value, []inputs js.Value) interface{} { | |
| this.Set("getX", js.FuncOf(pointGetX)) | |
| return nil | |
| } | |
| func main() { | |
| defineClass("Point", js.FuncOf(pointConstructor).Value) | |
| // Keep Golang running | |
| <-make(chan bool) | |
| } |
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