Anko

Anko is a scriptable interpreter written in Go.

(Picture licensed under CC BY-SA 3.0, photo by Ocdp)

Usage Example - Embedded

package main

import (
    "fmt"
    "log"

    "github.com/mattn/anko/env"
    "github.com/mattn/anko/vm"
)

func main() {
    e := env.NewEnv()

    err := e.Define("println", fmt.Println)
    if err != nil {
        log.Fatalf("Define error: %v\n", err)
    }

    script := `
println("Hello World :)")
`

    _, err = vm.Execute(e, nil, script)
    if err != nil {
        log.Fatalf("Execute error: %v\n", err)
    }

    // output: Hello World :)
}

More examples are located in the GoDoc:

https://godoc.org/github.com/mattn/anko/vm

Usage Example - Command Line

Building

go get github.com/mattn/anko
go install github.com/mattn/anko

Running an Anko script file named script.ank

./anko script.ank

Anko Script Quick Start

// declare variables
x = 1
y = x + 1

// print using outside the script defined println function
println(x + y) // 3

// if else statement
if x < 1 || y < 1 {
    println(x)
} else if x < 1 && y < 1 {
    println(y)
} else {
    println(x + y)
}

// slice
a = []interface{1, 2, 3}
println(a) // [1 2 3]
println(a[0]) // 1

// map
a = map[interface]interface{"x": 1}
println(a) // map[x:1]
a.b = 2
a["c"] = 3
println(a["b"]) // 2
println(a.c) // 3

// struct
a = make(struct {
    A int64,
    B float64
})
a.A = 4
a.B = 5.5
println(a.A) // 4
println(a.B) // 5.5

// function
func a (x) {
    println(x + 1)
}
a(5) // 6

// defer runs a function call when the surrounding function returns,
// in last-in first-out order
func b () {
    defer println("world")
    defer println("hello")
    println("start")
}
b() // start, hello, world

Please note that the master branch is not stable

The master branch language and API may change at any time.

To mitigate breaking changes, please use tagged branches. New tagged branches will be created for breaking changes.

Author

Yasuhiro Matsumoto (a.k.a mattn)

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