diff options
Diffstat (limited to 'vendor/github.com/d5/tengo/v2')
| -rw-r--r-- | vendor/github.com/d5/tengo/v2/README.md | 54 | ||||
| -rw-r--r-- | vendor/github.com/d5/tengo/v2/eval.go | 35 |
2 files changed, 67 insertions, 22 deletions
diff --git a/vendor/github.com/d5/tengo/v2/README.md b/vendor/github.com/d5/tengo/v2/README.md index bee19599..fd214cd9 100644 --- a/vendor/github.com/d5/tengo/v2/README.md +++ b/vendor/github.com/d5/tengo/v2/README.md @@ -4,7 +4,7 @@ # The Tengo Language -[](https://godoc.org/github.com/d5/tengo) +[](https://godoc.org/github.com/d5/tengo/v2)  [](https://goreportcard.com/report/github.com/d5/tengo) @@ -53,19 +53,19 @@ fmt.println(sum("", [1, 2, 3])) // "123" | | fib(35) | fibt(35) | Language (Type) | | :--- | ---: | ---: | :---: | -| [**Tengo**](https://github.com/d5/tengo) | `2,931ms` | `4ms` | Tengo (VM) | -| [go-lua](https://github.com/Shopify/go-lua) | `4,824ms` | `4ms` | Lua (VM) | -| [GopherLua](https://github.com/yuin/gopher-lua) | `5,365ms` | `4ms` | Lua (VM) | -| [goja](https://github.com/dop251/goja) | `5,533ms` | `5ms` | JavaScript (VM) | -| [starlark-go](https://github.com/google/starlark-go) | `11,495ms` | `5ms` | Starlark (Interpreter) | -| [Yaegi](https://github.com/containous/yaegi) | `15,645ms` | `12ms` | Yaegi (Interpreter) | -| [gpython](https://github.com/go-python/gpython) | `16,322ms` | `5ms` | Python (Interpreter) | -| [otto](https://github.com/robertkrimen/otto) | `73,093ms` | `10ms` | JavaScript (Interpreter) | -| [Anko](https://github.com/mattn/anko) | `79,809ms` | `8ms` | Anko (Interpreter) | +| [**Tengo**](https://github.com/d5/tengo) | `2,315ms` | `3ms` | Tengo (VM) | +| [go-lua](https://github.com/Shopify/go-lua) | `4,028ms` | `3ms` | Lua (VM) | +| [GopherLua](https://github.com/yuin/gopher-lua) | `4,409ms` | `3ms` | Lua (VM) | +| [goja](https://github.com/dop251/goja) | `5,194ms` | `4ms` | JavaScript (VM) | +| [starlark-go](https://github.com/google/starlark-go) | `6,954ms` | `3ms` | Starlark (Interpreter) | +| [gpython](https://github.com/go-python/gpython) | `11,324ms` | `4ms` | Python (Interpreter) | +| [Yaegi](https://github.com/containous/yaegi) | `11,715ms` | `10ms` | Yaegi (Interpreter) | +| [otto](https://github.com/robertkrimen/otto) | `48,539ms` | `6ms` | JavaScript (Interpreter) | +| [Anko](https://github.com/mattn/anko) | `52,821ms` | `6ms` | Anko (Interpreter) | | - | - | - | - | -| Go | `53ms` | `3ms` | Go (Native) | -| Lua | `1,612ms` | `3ms` | Lua (Native) | -| Python | `2,632ms` | `23ms` | Python 2 (Native) | +| Go | `47ms` | `2ms` | Go (Native) | +| Lua | `756ms` | `2ms` | Lua (Native) | +| Python | `1,907ms` | `14ms` | Python2 (Native) | _* [fib(35)](https://github.com/d5/tengobench/blob/master/code/fib.tengo): Fibonacci(35)_ @@ -93,21 +93,18 @@ import ( ) func main() { - // Tengo script code - src := ` -each := func(seq, fn) { + // create a new Script instance + script := tengo.NewScript([]byte( +`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)) + sum += x + mul *= x +})`)) // set values _ = script.Add("a", 1) @@ -128,6 +125,19 @@ each([a, b, c, d], func(x) { } ``` +Or, if you need to evaluate a simple expression, you can use [Eval](https://pkg.go.dev/github.com/d5/tengo/v2#Eval) function instead: + + +```golang +res, err := tengo.Eval(ctx, + `input ? "success" : "fail"`, + map[string]interface{}{"input": 1}) +if err != nil { + panic(err) +} +fmt.Println(res) // "success" +``` + ## References - [Language Syntax](https://github.com/d5/tengo/blob/master/docs/tutorial.md) diff --git a/vendor/github.com/d5/tengo/v2/eval.go b/vendor/github.com/d5/tengo/v2/eval.go new file mode 100644 index 00000000..9ce9b2a7 --- /dev/null +++ b/vendor/github.com/d5/tengo/v2/eval.go @@ -0,0 +1,35 @@ +package tengo + +import ( + "context" + "fmt" + "strings" +) + +// Eval compiles and executes given expr with params, and returns an +// evaluated value. expr must be an expression. Otherwise it will fail to +// compile. Expression must not use or define variable "__res__" as it's +// reserved for the internal usage. +func Eval( + ctx context.Context, + expr string, + params map[string]interface{}, +) (interface{}, error) { + expr = strings.TrimSpace(expr) + if expr == "" { + return nil, fmt.Errorf("empty expression") + } + + script := NewScript([]byte(fmt.Sprintf("__res__ := (%s)", expr))) + for pk, pv := range params { + err := script.Add(pk, pv) + if err != nil { + return nil, fmt.Errorf("script add: %w", err) + } + } + compiled, err := script.RunContext(ctx) + if err != nil { + return nil, fmt.Errorf("script run: %w", err) + } + return compiled.Get("__res__").Value(), nil +} |