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139 lines
4.5 KiB
Markdown
139 lines
4.5 KiB
Markdown
<p align="center">
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<img src="https://raw.githubusercontent.com/d5/tengolang-share/master/logo_400.png" width="200" height="200">
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</p>
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# The Tengo Language
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[](https://godoc.org/github.com/d5/tengo)
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[](https://goreportcard.com/report/github.com/d5/tengo)
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[](https://circleci.com/gh/d5/tengo)
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**Tengo is a small, dynamic, fast, secure script language for Go.**
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Tengo is **[fast](#benchmark)** and secure because it's compiled/executed as
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bytecode on stack-based VM that's written in native Go.
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```golang
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/* The Tengo Language */
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fmt := import("fmt")
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each := func(seq, fn) {
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for x in seq { fn(x) }
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}
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sum := func(init, seq) {
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each(seq, func(x) { init += x })
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return init
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}
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fmt.println(sum(0, [1, 2, 3])) // "6"
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fmt.println(sum("", [1, 2, 3])) // "123"
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```
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> Test this Tengo code in the
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> [Tengo Playground](https://tengolang.com/?s=0c8d5d0d88f2795a7093d7f35ae12c3afa17bea3)
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## Features
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- Simple and highly readable
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[Syntax](https://github.com/d5/tengo/blob/master/docs/tutorial.md)
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- Dynamic typing with type coercion
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- Higher-order functions and closures
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- Immutable values
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- [Securely Embeddable](https://github.com/d5/tengo/blob/master/docs/interoperability.md)
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and [Extensible](https://github.com/d5/tengo/blob/master/docs/objects.md)
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- Compiler/runtime written in native Go _(no external deps or cgo)_
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- Executable as a
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[standalone](https://github.com/d5/tengo/blob/master/docs/tengo-cli.md)
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language / REPL
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- Use cases: rules engine, [state machine](https://github.com/d5/go-fsm),
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data pipeline, [transpiler](https://github.com/d5/tengo2lua)
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## Benchmark
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| | fib(35) | fibt(35) | Type |
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| :--- | ---: | ---: | :---: |
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| Go | `48ms` | `3ms` | Go (native) |
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| [**Tengo**](https://github.com/d5/tengo) | `2,349ms` | `5ms` | VM on Go |
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| Lua | `1,416ms` | `3ms` | Lua (native) |
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| [go-lua](https://github.com/Shopify/go-lua) | `4,402ms` | `5ms` | Lua VM on Go |
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| [GopherLua](https://github.com/yuin/gopher-lua) | `4,023ms` | `5ms` | Lua VM on Go |
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| Python | `2,588ms` | `26ms` | Python (native) |
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| [starlark-go](https://github.com/google/starlark-go) | `11,126ms` | `6ms` | Python-like Interpreter on Go |
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| [gpython](https://github.com/go-python/gpython) | `15,035ms` | `4ms` | Python Interpreter on Go |
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| [goja](https://github.com/dop251/goja) | `5,089ms` | `5ms` | JS VM on Go |
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| [otto](https://github.com/robertkrimen/otto) | `68,377ms` | `11ms` | JS Interpreter on Go |
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| [Anko](https://github.com/mattn/anko) | `92,579ms` | `18ms` | Interpreter on Go |
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_* [fib(35)](https://github.com/d5/tengobench/blob/master/code/fib.tengo):
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Fibonacci(35)_
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_* [fibt(35)](https://github.com/d5/tengobench/blob/master/code/fibtc.tengo):
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[tail-call](https://en.wikipedia.org/wiki/Tail_call) version of Fibonacci(35)_
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_* **Go** does not read the source code from file, while all other cases do_
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_* See [here](https://github.com/d5/tengobench) for commands/codes used_
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## Quick Start
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```
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go get github.com/d5/tengo/v2
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```
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A simple Go example code that compiles/runs Tengo script code with some input/output values:
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```golang
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package main
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import (
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"context"
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"fmt"
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"github.com/d5/tengo/v2"
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)
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func main() {
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// Tengo script code
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src := `
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each := func(seq, fn) {
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for x in seq { fn(x) }
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}
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sum := 0
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mul := 1
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each([a, b, c, d], func(x) {
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sum += x
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mul *= x
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})`
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// create a new Script instance
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script := tengo.NewScript([]byte(src))
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// set values
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_ = script.Add("a", 1)
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_ = script.Add("b", 9)
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_ = script.Add("c", 8)
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_ = script.Add("d", 4)
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// run the script
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compiled, err := script.RunContext(context.Background())
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if err != nil {
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panic(err)
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}
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// retrieve values
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sum := compiled.Get("sum")
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mul := compiled.Get("mul")
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fmt.Println(sum, mul) // "22 288"
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}
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```
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## References
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- [Language Syntax](https://github.com/d5/tengo/blob/master/docs/tutorial.md)
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- [Object Types](https://github.com/d5/tengo/blob/master/docs/objects.md)
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- [Runtime Types](https://github.com/d5/tengo/blob/master/docs/runtime-types.md)
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and [Operators](https://github.com/d5/tengo/blob/master/docs/operators.md)
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- [Builtin Functions](https://github.com/d5/tengo/blob/master/docs/builtins.md)
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- [Interoperability](https://github.com/d5/tengo/blob/master/docs/interoperability.md)
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- [Tengo CLI](https://github.com/d5/tengo/blob/master/docs/tengo-cli.md)
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- [Standard Library](https://github.com/d5/tengo/blob/master/docs/stdlib.md)
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