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 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 // 15 16 package expr 17 18 import ( 19 "github.com/antonmedv/expr" 20 "github.com/pkg/errors" 21 ) 22 23 func EvalBool(expression string, env map[string]interface{}) (bool, error) { 24 eval, err := expr.Eval(expression, env) 25 if err != nil { 26 return false, err 27 } 28 result, ok := eval.(bool) 29 if !ok { 30 return false, errors.New("expression result is not boolean") 31 } 32 return result, nil 33 } 34