4.5 KiB
4.5 KiB
The Tengo Language
Tengo is a small, dynamic, fast, secure script language for Go.
Tengo is fast and secure because it's compiled/executed as bytecode on stack-based VM that's written in native Go.
/* The Tengo Language */
fmt := import("fmt")
each := func(seq, fn) {
for x in seq { fn(x) }
}
sum := func(init, seq) {
each(seq, func(x) { init += x })
return init
}
fmt.println(sum(0, [1, 2, 3])) // "6"
fmt.println(sum("", [1, 2, 3])) // "123"
Test this Tengo code in the Tengo Playground
Features
- Simple and highly readable
Syntax
- Dynamic typing with type coercion
- Higher-order functions and closures
- Immutable values
- Securely Embeddable and Extensible
- Compiler/runtime written in native Go (no external deps or cgo)
- Executable as a standalone language / REPL
- Use cases: rules engine, state machine, data pipeline, transpiler
Benchmark
| fib(35) | fibt(35) | Type | |
|---|---|---|---|
| Go | 48ms |
3ms |
Go (native) |
| Tengo | 2,349ms |
5ms |
VM on Go |
| Lua | 1,416ms |
3ms |
Lua (native) |
| go-lua | 4,402ms |
5ms |
Lua VM on Go |
| GopherLua | 4,023ms |
5ms |
Lua VM on Go |
| Python | 2,588ms |
26ms |
Python (native) |
| starlark-go | 11,126ms |
6ms |
Python-like Interpreter on Go |
| gpython | 15,035ms |
4ms |
Python Interpreter on Go |
| goja | 5,089ms |
5ms |
JS VM on Go |
| otto | 68,377ms |
11ms |
JS Interpreter on Go |
| Anko | 92,579ms |
18ms |
Interpreter on Go |
* fib(35):
Fibonacci(35)
* fibt(35):
tail-call version of Fibonacci(35)
* Go does not read the source code from file, while all other cases do
* See here for commands/codes used
Quick Start
A simple Go example code that compiles/runs Tengo script code with some input/output values:
package main
import (
"context"
"fmt"
"github.com/d5/tengo/v2"
)
func main() {
// Tengo script code
src := `
each := func(seq, fn) {
for x in seq { fn(x) }
}
sum := 0
mul := 1
each([a, b, c, d], func(x) {
sum += x
mul *= x
})`
// create a new Script instance
script := tengo.NewScript([]byte(src))
// set values
_ = script.Add("a", 1)
_ = script.Add("b", 9)
_ = script.Add("c", 8)
_ = script.Add("d", 4)
// run the script
compiled, err := script.RunContext(context.Background())
if err != nil {
panic(err)
}
// retrieve values
sum := compiled.Get("sum")
mul := compiled.Get("mul")
fmt.Println(sum, mul) // "22 288"
}