1 // Copyright 2021 Chaos Mesh Authors. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // See the License for the specific language governing permissions and 12 // limitations under the License. 13 14 package expr 15 16 import ( 17 "github.com/antonmedv/expr" 18 "github.com/pkg/errors" 19 ) 20 21 func EvalBool(expression string, env map[string]interface{}) (bool, error) { 22 eval, err := expr.Eval(expression, env) 23 if err != nil { 24 return false, err 25 } 26 result, ok := eval.(bool) 27 if !ok { 28 return false, errors.Errorf("expression result is not boolean") 29 } 30 return result, nil 31 } 32