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(Duktape bindings for Go(Golang)
Duktape is a thin, embeddable javascript engine.
Most of the api is implemented.
The exceptions are listed here.
Usage
The package is fully go-getable, no need to install any external C libraries.
So, just type go get gopkg.in/olebedev/go-duktape.v3 to install.
package main
import "fmt"
import "gopkg.in/olebedev/go-duktape.v3"
func main() {
ctx := duktape.New()
ctx.PevalString(`2 + 3`)
result := ctx.GetNumber(-1)
ctx.Pop()
fmt.Println("result is:", result)
// To prevent memory leaks, don't forget to clean up after
// yourself when you're done using a context.
ctx.DestroyHeap()
}
Go specific notes
Bindings between Go and Javascript contexts are not fully functional.
However, binding a Go function to the Javascript context is available:
package main
import "fmt"
import "gopkg.in/olebedev/go-duktape.v3"
func main() {
ctx := duktape.New()
ctx.PushGlobalGoFunction("log", func(c *duktape.Context) int {
fmt.Println(c.SafeToString(-1))
return 0
})
ctx.PevalString(`log('Go lang Go!')`)
}
then run it.
$ go run *.go
Go lang Go!
$
Timers
There is a method to inject timers to the global scope:
package main
import "fmt"
import "gopkg.in/olebedev/go-duktape.v3"
func main() {
ctx := duktape.New()
// Let's inject `setTimeout`, `setInterval`, `clearTimeout`,
// `clearInterval` into global scope.
ctx.PushTimers()
ch := make(chan string)
ctx.PushGlobalGoFunction("second", func(_ *Context) int {
ch <- "second step"
return 0
})
ctx.PevalString(`
setTimeout(second, 0);
print('first step');
`)
fmt.Println(<-ch)
}
then run it
$ go run *.go
first step
second step
$
Also you can FlushTimers().
Command line tool
Install go get gopkg.in/olebedev/go-duktape.v3/....
Execute file.js: $GOPATH/bin/go-duk file.js.
Benchmarks, prog, time, ------------, -------, otto, 200.13s, anko, 231.19s, agora, 149.33s, GopherLua, 8.39s, go-duktape, 9.80s, More details are here.
Status
The package is not fully tested, so be careful.
Contribution
Pull requests are welcome! Also, if you want to discuss something send a pull request with proposal and changes.
Convention: fork the repository and make changes on your fork in a feature branch.