| 24 | ) |
| 25 | |
| 26 | func Example_cel_Overload() { |
| 27 | env, err := cel.NewEnv( |
| 28 | cel.Variable("i", cel.StringType), |
| 29 | cel.Variable("you", cel.StringType), |
| 30 | cel.Function("shake_hands", |
| 31 | cel.Overload("shake_hands_string_string", |
| 32 | []*cel.Type{cel.StringType, cel.StringType}, |
| 33 | cel.StringType, |
| 34 | cel.BinaryBinding(func(lhs, rhs ref.Val) ref.Val { |
| 35 | return types.String( |
| 36 | fmt.Sprintf("%s and %s are shaking hands.\n", lhs, rhs)) |
| 37 | }, |
| 38 | ), |
| 39 | ), |
| 40 | ), |
| 41 | ) |
| 42 | if err != nil { |
| 43 | log.Fatalf("environment creation error: %v\n", err) |
| 44 | } |
| 45 | // Check iss for error in both Parse and Check. |
| 46 | ast, iss := env.Compile(`shake_hands(i,you)`) |
| 47 | if iss.Err() != nil { |
| 48 | log.Fatalln(iss.Err()) |
| 49 | } |
| 50 | prg, err := env.Program(ast) |
| 51 | if err != nil { |
| 52 | log.Fatalf("Program creation error: %v\n", err) |
| 53 | } |
| 54 | |
| 55 | out, _, err := prg.Eval(map[string]any{ |
| 56 | "i": "CEL", |
| 57 | "you": "world", |
| 58 | }) |
| 59 | if err != nil { |
| 60 | log.Fatalf("Evaluation error: %v\n", err) |
| 61 | } |
| 62 | |
| 63 | fmt.Println(out) |
| 64 | // Output:CEL and world are shaking hands. |
| 65 | } |