golpal

Golpal

Easy to use Golang Eval Library

Introduction

Golpal is simple library to allow developer to do eval operation on golang source codes. Technically Golang doesn't provide API to do some eval, so we use temporary file to achieve that.

Installation

Stable version: v1.0.0

Just go get the lib is enough

go get -u github.com/novalagung/golpal

Run test

cd $GOPATH/src/github.com/novalagung/golpal
go test *.go -v

Example

Simple Example

package main

import "github.com/novalagung/golpal"
import "fmt"

func main() {
	cmdString := `3 + 2`
	output, err := golpal.New().ExecuteSimple(cmdString)
	if err != nil {
		fmt.Println(err)
	}
	fmt.Println("result", "=>", output)
}

For one line statement using ExecuteSimple(), return keyword is optional

Another Example

cmdString := `
	number := 3
	if number == 2 {
		return "wrong"
	} else {
		return "right"
	}
`

output, err := golpal.New().ExecuteSimple(cmdString)
if err != nil {
	fmt.Println(err)
}
fmt.Println("result", "=>", output)

For multiline statement using ExecuteSimple(), return must be defined

Example which use strings and runtime

cmdString := `
	osName := runtime.GOOS
	arr := []string{"my", "operation system", "is", osName}
	return strings.Join(arr, ", ")
`

output, err := golpal.New().AddLibs("strings", "runtime").ExecuteSimple(cmdString)
if err != nil {
	fmt.Println(err)
}
fmt.Println("result", "=>", output)

Example Not Simple (again, NOT SIMPLE, by using Execute() func)

cmdString := `
	func calculate(values ...int) int {
		total := 0
		for _, each := range values {
			total = total + each
		}
		return total
	}

	func main() {
		res := calculate(1, 2, 3, 4, 2, 3, 1)
		fmt.Printf("total : %d", res)
	}
`

output, err := golpal.New().Execute(cmdString)
if err != nil {
	fmt.Println(err)
}
fmt.Println("result", "=>", output)

Example Execute Raw (use ExecuteRaw() func)

cmdString := `
	package main

	import "fmt"

	func main() {
		fmt.Print("hello")
	}
`

output, err := golpal.New().ExecuteRaw(cmdString)
if err != nil {
	fmt.Println(err)
}
fmt.Println("result", "=>", output)

More Example

For more examples please take a look at the golpal_test.go file.

API Reference

Func of golpal

There are only one func available, golpal.New() which return object that type is *golpal.Golpal

Properties of *golpal.Golpal

Methods of *golpal.Golpal

Contribution

Feel free to contribute

fork -> commit -> push -> pull request

License

MIT License

Author

Noval Agung Prayogo - http://novalagung.com/