forked from Team-Ortix/golang-wasm
Compare commits
16 Commits
| Author | SHA1 | Date |
|---|---|---|
 ALI Hamza
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be4b312d49
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 Chan Wen Xu
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421c331333
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Chan Wen Xu
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8eadf27091
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Chan Wen Xu
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9faa609930
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Chan Wen Xu
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37088bf382
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Chan Wen Xu
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ad5b341b1e
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Chan Wen Xu
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f3864a59ca
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Chan Wen Xu
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392b175abf
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ALI Hamza
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da1769920a
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ALI Hamza
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3b119bd81a
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ALI Hamza
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92296f6a56
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ALI Hamza
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caaad47c74
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ALI Hamza
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f6150013d5
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ALI Hamza
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f6d264ea40
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ALI Hamza
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ef20dff682
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ALI Hamza
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f19165c53d
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@ -0,0 +1,4 @@
|
||||
node_modules
|
||||
.gocache
|
||||
wasm_exec.js
|
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*.wasm
|
||||
@ -0,0 +1,3 @@
|
||||
example
|
||||
wasm
|
||||
.gocache
|
||||
@ -0,0 +1,21 @@
|
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MIT License
|
||||
|
||||
Copyright (c) 2021 Hamza Ali and Chan Wen Xu
|
||||
|
||||
Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
of this software and associated documentation files (the "Software"), to deal
|
||||
in the Software without restriction, including without limitation the rights
|
||||
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
copies of the Software, and to permit persons to whom the Software is
|
||||
furnished to do so, subject to the following conditions:
|
||||
|
||||
The above copyright notice and this permission notice shall be included in all
|
||||
copies or substantial portions of the Software.
|
||||
|
||||
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
SOFTWARE.
|
||||
@ -0,0 +1 @@
|
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dist/main.js
|
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@ -0,0 +1,13 @@
|
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<!DOCTYPE html>
|
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<html>
|
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|
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<head>
|
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<meta charset="utf-8" />
|
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<title>Golang-WASM</title>
|
||||
</head>
|
||||
|
||||
<body>
|
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<script src="main.js"></script>
|
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</body>
|
||||
|
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</html>
|
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@ -0,0 +1,3 @@
|
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module example
|
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|
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go 1.16
|
||||
File diff suppressed because it is too large
Load Diff
@ -0,0 +1,15 @@
|
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{
|
||||
"name": "example",
|
||||
"version": "1.0.0",
|
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"description": "",
|
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"private": true,
|
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"scripts": {
|
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"start": "GOROOT=`go env GOROOT` webpack serve"
|
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},
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"author": "",
|
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"license": "ISC",
|
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"devDependencies": {
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"webpack": "^5.27.0",
|
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"webpack-dev-server": "^3.11.2"
|
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}
|
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}
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@ -0,0 +1,20 @@
|
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package main
|
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|
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import (
|
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"fmt"
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"syscall/js"
|
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)
|
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|
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func main() {
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fmt.Println("Hello from go-mod-wasm!")
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setup()
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|
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c := make(chan bool, 0) // To use anything from Go WASM, the program may not exit.
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<-c
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}
|
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|
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func setup() {
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fmt.Println("golang-wasm initialized")
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|
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js.Global()
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}
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@ -0,0 +1,8 @@
|
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import wasm from './api/main.go';
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|
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const { hello, helloName } = wasm;
|
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|
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(async () => {
|
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console.log(await hello());
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console.log(await helloName("world"));
|
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})()
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@ -0,0 +1,53 @@
|
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const path = require('path');
|
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|
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module.exports = {
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entry: './src/index.js',
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devServer: {
|
||||
contentBase: path.resolve(__dirname, 'dist'),
|
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compress: true,
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port: 3000,
|
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},
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mode: "development",
|
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output: {
|
||||
filename: 'main.js',
|
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path: path.resolve(__dirname, 'dist'),
|
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},
|
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resolve: {
|
||||
extensions: [".js", ".go"],
|
||||
fallback: {
|
||||
"fs": false,
|
||||
"os": false,
|
||||
"util": false,
|
||||
"tls": false,
|
||||
"net": false,
|
||||
"path": false,
|
||||
"zlib": false,
|
||||
"http": false,
|
||||
"https": false,
|
||||
"stream": false,
|
||||
"crypto": false,
|
||||
}
|
||||
},
|
||||
module: {
|
||||
rules: [
|
||||
{
|
||||
test: /\.go$/,
|
||||
use: [
|
||||
{
|
||||
loader: path.resolve(__dirname, '../../src/index.js')
|
||||
}
|
||||
]
|
||||
}
|
||||
]
|
||||
},
|
||||
performance: {
|
||||
assetFilter: (file) => {
|
||||
return !/(\.wasm|.map)$/.test(file)
|
||||
}
|
||||
},
|
||||
ignoreWarnings: [
|
||||
{
|
||||
module: /wasm_exec.js$/
|
||||
}
|
||||
]
|
||||
};
|
||||
File diff suppressed because it is too large
Load Diff
@ -0,0 +1,79 @@
|
||||
const g = global || window || self;
|
||||
if (!g.__go_wasm__) {
|
||||
g.__go_wasm__ = {};
|
||||
}
|
||||
|
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const maxTime = 3 * 1000;
|
||||
|
||||
const bridge = g.__go_wasm__;
|
||||
|
||||
|
||||
/**
|
||||
* Wrapper is used by Go to run all Go functions in JS.
|
||||
* Go functions always return an object of the following spec:
|
||||
* {
|
||||
* result: undefined | any // undefined when error is returned, or function returns undefined
|
||||
* error: Error | undefined // undefined when no error is present
|
||||
* }
|
||||
*/
|
||||
function wrapper(goFunc) {
|
||||
return (...args) => {
|
||||
const result = goFunc.apply(undefined, args);
|
||||
if (result.error instanceof Error) {
|
||||
throw result.error;
|
||||
}
|
||||
return result.result;
|
||||
}
|
||||
}
|
||||
bridge.__wrapper__ = wrapper
|
||||
|
||||
function sleep() {
|
||||
return new Promise(requestAnimationFrame);
|
||||
}
|
||||
export default function (getBytes) {
|
||||
let proxy;
|
||||
|
||||
async function init() {
|
||||
const go = new g.Go();
|
||||
let bytes = await getBytes;
|
||||
let result = await WebAssembly.instantiate(bytes, go.importObject);
|
||||
go.run(result.instance);
|
||||
bridge.__proxy__ = proxy
|
||||
setTimeout(() => {
|
||||
if (bridge.__ready__ !== true) {
|
||||
console.warn("Golang Wasm Bridge (__go_wasm__.__ready__) still not true after max time");
|
||||
}
|
||||
}, maxTime);
|
||||
}
|
||||
|
||||
init();
|
||||
|
||||
|
||||
proxy = new Proxy(
|
||||
{},
|
||||
{
|
||||
get: (_, key) => {
|
||||
return (...args) => {
|
||||
return new Promise(async (res, rej) => {
|
||||
while (bridge.__ready__ !== true) {
|
||||
await sleep();
|
||||
}
|
||||
|
||||
if (typeof bridge[key] !== 'function') {
|
||||
res(bridge[key]);
|
||||
return;
|
||||
}
|
||||
|
||||
try {
|
||||
res(bridge[key].apply(undefined, args));
|
||||
} catch (e) {
|
||||
rej(e)
|
||||
}
|
||||
})
|
||||
};
|
||||
}
|
||||
}
|
||||
);
|
||||
|
||||
return proxy;
|
||||
}
|
||||
@ -0,0 +1,85 @@
|
||||
const fs = require("fs/promises");
|
||||
const util = require("util");
|
||||
const execFile = util.promisify(require("child_process").execFile);
|
||||
const path = require("path");
|
||||
const { lookpath } = require("lookpath");
|
||||
|
||||
module.exports = function (source) {
|
||||
const cb = this.async();
|
||||
|
||||
const goBin = lookpath("go");
|
||||
if (!goBin) {
|
||||
return cb(new Error("go bin not found in path."));
|
||||
}
|
||||
|
||||
if (!process.env.GOROOT) {
|
||||
return cb(new Error("Could not find GOROOT in environment.\n" +
|
||||
"Please try adding this to your script:\n" +
|
||||
"GOROOT=`go env GOROOT` npm run ..."));
|
||||
}
|
||||
|
||||
const parent = path.dirname(this.resourcePath);
|
||||
const outFile = this.resourcePath.slice(0, -2) + "wasm";
|
||||
let modDir = parent;
|
||||
|
||||
const opts = {
|
||||
cwd: parent,
|
||||
env: {
|
||||
GOPATH: process.env.GOPATH || path.join(process.env.HOME, "go"),
|
||||
GOROOT: process.env.GOROOT,
|
||||
GOCACHE: path.join(__dirname, ".gocache"),
|
||||
GOOS: "js",
|
||||
GOARCH: "wasm",
|
||||
},
|
||||
};
|
||||
|
||||
(async () => {
|
||||
let found = false;
|
||||
const root = path.resolve(path.sep);
|
||||
while (path.resolve(modDir) != root) {
|
||||
found = await fs.access(path.join(modDir, 'go.mod')).then(() => true).catch(() => false);
|
||||
if (found) {
|
||||
break;
|
||||
}
|
||||
modDir = path.join(modDir, "..");
|
||||
}
|
||||
|
||||
if (!found) {
|
||||
return cb(new Error("Could not find go.mod in any parent directory of " + this.resourcePath));
|
||||
}
|
||||
|
||||
const wasmOrigPath = path.join(process.env.GOROOT, "misc", "wasm", "wasm_exec.js");
|
||||
const wasmSavePath = path.join(__dirname, 'wasm_exec.js');
|
||||
const errorPaths = ["\t" + wasmOrigPath, "\t" + wasmSavePath];
|
||||
if (!(await fs.access(wasmOrigPath).then(() => true).catch(() => false)) &&
|
||||
!(await fs.access(wasmSavePath).then(() => true).catch(() => false))) {
|
||||
return cb(new Error("Could not find wasm_exec.js file. Invalid GOROOT? Searched paths:\n" +
|
||||
errorPaths.join(",\n") + "\n"));
|
||||
}
|
||||
|
||||
|
||||
const result = await execFile("go", ["build", "-o", outFile, parent], opts)
|
||||
.then(() => true)
|
||||
.catch(e => e);
|
||||
if (result instanceof Error) {
|
||||
return cb(result);
|
||||
}
|
||||
|
||||
found = await fs.access(wasmSavePath).then(() => true).catch(() => false);
|
||||
if (!found) fs.copyFile(wasmOrigPath, wasmSavePath);
|
||||
|
||||
const contents = await fs.readFile(outFile);
|
||||
fs.unlink(outFile);
|
||||
|
||||
const emitPath = path.basename(outFile);
|
||||
this.emitFile(emitPath, contents);
|
||||
this.addContextDependency(modDir);
|
||||
|
||||
cb(null,
|
||||
`require('!${wasmSavePath}');
|
||||
import goWasm from '${path.join(__dirname, 'bridge.js')}';
|
||||
|
||||
const wasm = fetch('${emitPath}').then(response => response.arrayBuffer());
|
||||
export default goWasm(wasm);`);
|
||||
})();
|
||||
}
|
||||
@ -1,11 +1,411 @@
|
||||
package wasm
|
||||
|
||||
import (
|
||||
"errors"
|
||||
"fmt"
|
||||
"reflect"
|
||||
"syscall/js"
|
||||
)
|
||||
|
||||
// ErrMultipleReturnValue is an error where a JS function is attempted to be unmarshalled into a Go function with
|
||||
// multiple return values.
|
||||
var ErrMultipleReturnValue = errors.New("a JS function can only return one value")
|
||||
|
||||
// InvalidFromJSValueError is an error where an invalid argument is passed to FromJSValue.
|
||||
// The argument to Unmarshal must be a non-nil pointer.
|
||||
type InvalidFromJSValueError struct {
|
||||
Type reflect.Type
|
||||
}
|
||||
|
||||
// Error implements error.
|
||||
func (e InvalidFromJSValueError) Error() string {
|
||||
return "invalid argument passed to FromJSValue. Got type " + e.Type.String()
|
||||
}
|
||||
|
||||
// InvalidTypeError is an error where the JS value cannot be unmarshalled into the provided Go type.
|
||||
type InvalidTypeError struct {
|
||||
JSType js.Type
|
||||
GoType reflect.Type
|
||||
}
|
||||
|
||||
// Error implements error.
|
||||
func (e InvalidTypeError) Error() string {
|
||||
return "invalid unmarshalling: cannot unmarshal " + e.JSType.String() + " into " + e.GoType.String()
|
||||
}
|
||||
|
||||
// InvalidArrayError is an error where the JS's array length do not match Go's array length.
|
||||
type InvalidArrayError struct {
|
||||
Expected int
|
||||
Actual int
|
||||
}
|
||||
|
||||
// Error implements error.
|
||||
func (e InvalidArrayError) Error() string {
|
||||
return fmt.Sprintf(
|
||||
"invalid unmarshalling: expected array of length %d to match Go array but got JS array of length %d",
|
||||
e.Expected, e.Actual,
|
||||
)
|
||||
}
|
||||
|
||||
// Decoder is an interface which manually decodes js.Value on its own.
|
||||
// It overrides in FromJSValue.
|
||||
type Decoder interface {
|
||||
FromJSValue(js.Value) error
|
||||
}
|
||||
|
||||
// FromJSValue converts a given js.Value to the Go equivalent.
|
||||
// The new value of 'out' is undefined if FromJSValue returns an error.
|
||||
//
|
||||
// When a JS function is unmarshalled into a Go function with only one return value, the returned JS value is casted
|
||||
// into the type of the return value. If the conversion fails, the function call panics.
|
||||
//
|
||||
// When a JS function is unmarshalled into a Go function with two return values, the second one being error, the
|
||||
// conversion error is returned instead.
|
||||
func FromJSValue(x js.Value, out interface{}) error {
|
||||
// TODO
|
||||
return fmt.Errorf("unimplemented")
|
||||
v := reflect.ValueOf(out)
|
||||
if v.Kind() != reflect.Ptr || v.IsNil() {
|
||||
return &InvalidFromJSValueError{reflect.TypeOf(v)}
|
||||
}
|
||||
|
||||
return decodeValue(x, v.Elem())
|
||||
}
|
||||
|
||||
// decodeValue decodes the provided js.Value into the provided reflect.Value.
|
||||
func decodeValue(x js.Value, v reflect.Value) error {
|
||||
// If we have undefined or null, we need to be able to set to the pointer itself.
|
||||
// All code beyond this point are pointer-unaware so we handle undefined or null first.
|
||||
if x.Type() == js.TypeUndefined || x.Type() == js.TypeNull {
|
||||
return decodeNothing(v)
|
||||
}
|
||||
|
||||
// Implementations of Decoder are probably on pointer so do it before pointer code.
|
||||
if d, ok := v.Addr().Interface().(Decoder); ok {
|
||||
return d.FromJSValue(x)
|
||||
}
|
||||
|
||||
// Make sure everything is initialized and indirect it.
|
||||
// This prevents other decode functions from having to handle pointers.
|
||||
if v.Kind() == reflect.Ptr {
|
||||
initializePointerIfNil(v)
|
||||
v = reflect.Indirect(v)
|
||||
}
|
||||
|
||||
if v.Kind() == reflect.Interface && v.NumMethod() == 0 {
|
||||
// It's a interface{} so we just create the easiest Go representation we can in createInterface.
|
||||
res := createInterface(x)
|
||||
if res != nil {
|
||||
v.Set(reflect.ValueOf(res))
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// Directly set v if it's a js.Value.
|
||||
if _, ok := v.Interface().(js.Value); ok {
|
||||
v.Set(reflect.ValueOf(x))
|
||||
return nil
|
||||
}
|
||||
|
||||
// Go the reflection route.
|
||||
switch x.Type() {
|
||||
case js.TypeBoolean:
|
||||
return decodeBoolean(x, v)
|
||||
case js.TypeNumber:
|
||||
return decodeNumber(x, v)
|
||||
case js.TypeString:
|
||||
return decodeString(x, v)
|
||||
case js.TypeSymbol:
|
||||
return decodeSymbol(x, v)
|
||||
case js.TypeObject:
|
||||
if isArray(x) {
|
||||
return decodeArray(x, v)
|
||||
}
|
||||
return decodeObject(x, v)
|
||||
case js.TypeFunction:
|
||||
return decodeFunction(x, v)
|
||||
default:
|
||||
panic("unknown JS type: " + x.Type().String())
|
||||
}
|
||||
}
|
||||
|
||||
// decodeNothing decodes an undefined or a null into the provided reflect.Value.
|
||||
func decodeNothing(v reflect.Value) error {
|
||||
if v.Kind() != reflect.Ptr {
|
||||
return InvalidTypeError{js.TypeNull, v.Type()}
|
||||
}
|
||||
v.Set(reflect.ValueOf(nil))
|
||||
return nil
|
||||
}
|
||||
|
||||
// decodeBoolean decodes a bool into the provided reflect.Value.
|
||||
func decodeBoolean(x js.Value, v reflect.Value) error {
|
||||
if v.Kind() != reflect.Bool {
|
||||
return InvalidTypeError{js.TypeBoolean, v.Type()}
|
||||
}
|
||||
v.SetBool(x.Bool())
|
||||
return nil
|
||||
}
|
||||
|
||||
// decodeNumber decodes a JS number into the provided reflect.Value, truncating as necessary.
|
||||
func decodeNumber(x js.Value, v reflect.Value) error {
|
||||
switch v.Kind() {
|
||||
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
||||
v.SetInt(int64(x.Float()))
|
||||
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
|
||||
v.SetUint(uint64(x.Float()))
|
||||
case reflect.Float32, reflect.Float64:
|
||||
v.SetFloat(x.Float())
|
||||
default:
|
||||
return InvalidTypeError{js.TypeNumber, v.Type()}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// decodeString decodes a JS string into the provided reflect.Value.
|
||||
func decodeString(x js.Value, v reflect.Value) error {
|
||||
if v.Kind() != reflect.String {
|
||||
return InvalidTypeError{js.TypeString, v.Type()}
|
||||
}
|
||||
v.SetString(x.String())
|
||||
return nil
|
||||
}
|
||||
|
||||
// decodeSymbol decodes a JS symbol into the provided reflect.Value.
|
||||
func decodeSymbol(x js.Value, v reflect.Value) error {
|
||||
// TODO Decode it into a symbol type.
|
||||
return InvalidTypeError{js.TypeSymbol, v.Type()}
|
||||
}
|
||||
|
||||
// decodeArray decodes a JS array into the provided reflect.Value.
|
||||
func decodeArray(x js.Value, v reflect.Value) error {
|
||||
jsLen := x.Length()
|
||||
|
||||
switch v.Kind() {
|
||||
case reflect.Array:
|
||||
if jsLen != v.Len() {
|
||||
return InvalidArrayError{v.Len(), jsLen}
|
||||
}
|
||||
case reflect.Slice:
|
||||
newSlice := reflect.MakeSlice(v.Type(), jsLen, jsLen)
|
||||
v.Set(newSlice)
|
||||
default:
|
||||
return InvalidTypeError{js.TypeObject, v.Type()}
|
||||
}
|
||||
|
||||
for i := 0; i < jsLen; i++ {
|
||||
err := FromJSValue(x.Index(i), v.Index(i).Addr().Interface())
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// decodeObject decodes a JS object into the provided reflect.Value.
|
||||
func decodeObject(x js.Value, v reflect.Value) error {
|
||||
switch v.Kind() {
|
||||
case reflect.Struct:
|
||||
return decodeObjectIntoStruct(x, v)
|
||||
case reflect.Map:
|
||||
return decodeObjectIntoMap(x, v)
|
||||
default:
|
||||
return InvalidTypeError{js.TypeObject, v.Type()}
|
||||
}
|
||||
}
|
||||
|
||||
// decodeObject decodes a JS object into the provided reflect.Value struct.
|
||||
func decodeObjectIntoStruct(x js.Value, v reflect.Value) error {
|
||||
for i := 0; i < v.Type().NumField(); i++ {
|
||||
fieldType := v.Type().Field(i)
|
||||
if fieldType.PkgPath != "" {
|
||||
continue
|
||||
}
|
||||
|
||||
name := fieldType.Name
|
||||
tagName, tagOK := fieldType.Tag.Lookup("wasm")
|
||||
|
||||
if tagOK {
|
||||
name = tagName
|
||||
}
|
||||
|
||||
err := decodeValue(x.Get(name), v.Field(i))
|
||||
if err != nil {
|
||||
if tagOK {
|
||||
return fmt.Errorf("in field %s (JS %s): %w", fieldType.Name, tagName, err)
|
||||
}
|
||||
return fmt.Errorf("in field %s: %w", fieldType.Name, err)
|
||||
}
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
func decodeObjectIntoMap(x js.Value, v reflect.Value) error {
|
||||
mapType := v.Type()
|
||||
keyType := mapType.Key()
|
||||
valType := mapType.Elem()
|
||||
|
||||
switch keyType.Kind() {
|
||||
case reflect.String:
|
||||
case reflect.Interface:
|
||||
if keyType.NumMethod() != 0 {
|
||||
return InvalidTypeError{js.TypeObject, mapType}
|
||||
}
|
||||
default:
|
||||
return InvalidTypeError{js.TypeObject, mapType}
|
||||
}
|
||||
|
||||
// TODO: Use Object API
|
||||
obj, err := Global().Get("Object")
|
||||
if err != nil {
|
||||
panic("Object not found")
|
||||
}
|
||||
|
||||
var keys []string
|
||||
err = FromJSValue(obj.Call("keys", x), &keys)
|
||||
if err != nil {
|
||||
panic("Object.keys returned non-string-array.")
|
||||
}
|
||||
|
||||
for _, k := range keys {
|
||||
valuePtr := reflect.New(valType).Interface()
|
||||
err := FromJSValue(x.Get(k), valuePtr)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
v.SetMapIndex(reflect.ValueOf(k), reflect.ValueOf(valuePtr).Elem())
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// decodeFunction decodes a JS function into the provided reflect.Value.
|
||||
func decodeFunction(x js.Value, v reflect.Value) error {
|
||||
funcType := v.Type()
|
||||
outCount := funcType.NumOut()
|
||||
|
||||
switch outCount {
|
||||
case 0, 1:
|
||||
case 2:
|
||||
if funcType.Out(1) != errorType {
|
||||
return ErrMultipleReturnValue
|
||||
}
|
||||
default:
|
||||
return ErrMultipleReturnValue
|
||||
}
|
||||
|
||||
v.Set(reflect.MakeFunc(funcType, func(args []reflect.Value) []reflect.Value {
|
||||
argsJS := make([]interface{}, 0, len(args))
|
||||
for _, v := range args {
|
||||
argsJS = append(argsJS, ToJSValue(v.Interface()))
|
||||
}
|
||||
|
||||
jsReturn := x.Invoke(argsJS...)
|
||||
if outCount == 0 {
|
||||
return []reflect.Value{}
|
||||
}
|
||||
|
||||
returnPtr := reflect.New(funcType.Out(0)).Interface()
|
||||
err := FromJSValue(jsReturn, returnPtr)
|
||||
|
||||
returnVal := reflect.ValueOf(returnPtr).Elem()
|
||||
if err != nil {
|
||||
if outCount == 1 {
|
||||
panic("error decoding JS return value: " + err.Error())
|
||||
}
|
||||
|
||||
return []reflect.Value{returnVal, reflect.ValueOf(err)}
|
||||
}
|
||||
|
||||
switch outCount {
|
||||
case 1:
|
||||
return []reflect.Value{returnVal}
|
||||
case 2:
|
||||
return []reflect.Value{returnVal, reflect.ValueOf(nil)}
|
||||
default:
|
||||
panic("unexpected amount of return values")
|
||||
}
|
||||
}))
|
||||
return nil
|
||||
}
|
||||
|
||||
// createInterface creates a representation of the provided js.Value.
|
||||
func createInterface(x js.Value) interface{} {
|
||||
switch x.Type() {
|
||||
case js.TypeUndefined, js.TypeNull:
|
||||
return nil
|
||||
case js.TypeBoolean:
|
||||
return x.Bool()
|
||||
case js.TypeNumber:
|
||||
return x.Float()
|
||||
case js.TypeString:
|
||||
return x.String()
|
||||
case js.TypeSymbol:
|
||||
// We can't convert it to a Go value in a meaningful way.
|
||||
return x
|
||||
case js.TypeObject:
|
||||
if isArray(x) {
|
||||
return createArray(x)
|
||||
}
|
||||
return createObject(x)
|
||||
case js.TypeFunction:
|
||||
var a func(...interface{}) (interface{}, error)
|
||||
err := FromJSValue(x, &a)
|
||||
if err != nil {
|
||||
panic("error creating function: " + err.Error())
|
||||
}
|
||||
return a
|
||||
default:
|
||||
panic("unknown JS type: " + x.Type().String())
|
||||
}
|
||||
}
|
||||
|
||||
// createArray creates a slice of interface representing the js.Value.
|
||||
func createArray(x js.Value) interface{} {
|
||||
result := make([]interface{}, x.Length())
|
||||
for i := range result {
|
||||
result[i] = createInterface(x.Index(i))
|
||||
}
|
||||
return result
|
||||
}
|
||||
|
||||
// createObject creates a representation of the provided JS object.
|
||||
func createObject(x js.Value) interface{} {
|
||||
// TODO: Use Object API
|
||||
obj, err := Global().Get("Object")
|
||||
if err != nil {
|
||||
panic("Object not found")
|
||||
}
|
||||
|
||||
var keys []string
|
||||
err = FromJSValue(obj.Call("keys", x), &keys)
|
||||
if err != nil {
|
||||
panic("Object.keys returned non-string-array.")
|
||||
}
|
||||
|
||||
result := make(map[string]interface{}, len(keys))
|
||||
for _, v := range keys {
|
||||
result[v] = createInterface(x.Get(v))
|
||||
}
|
||||
return result
|
||||
}
|
||||
|
||||
// isArray calls the JS function Array.isArray to check if the provided js.Value is an array.
|
||||
func isArray(x js.Value) bool {
|
||||
arr, err := Global().Get("Array")
|
||||
if err != nil {
|
||||
panic("Array not found")
|
||||
}
|
||||
|
||||
return arr.Call("isArray", x).Bool()
|
||||
}
|
||||
|
||||
// initializePointerIfNil checks if the pointer is nil and initializes it as necessary.
|
||||
func initializePointerIfNil(v reflect.Value) {
|
||||
if v.Kind() != reflect.Ptr {
|
||||
return
|
||||
}
|
||||
if v.IsNil() {
|
||||
v.Set(reflect.New(v.Type().Elem()))
|
||||
}
|
||||
initializePointerIfNil(v.Elem())
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue