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expression.go
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43 lines (32 loc) · 1006 Bytes
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package smart
import (
"github.com/Knetic/govaluate"
"github.com/astaxie/beego/logs"
)
type Expression interface {
// 执行表达式
Eval(expr string, params map[string]interface{}) bool
Evaluate(expr string, params map[string]interface{}) interface{}
}
type SmartExpression struct {
}
func NewSmartExpression() Expression {
return &SmartExpression{}
}
func (s *SmartExpression) Eval(expr string, params map[string]interface{}) bool {
if r := s.Evaluate(expr, params); r == nil {
return false
} else {
return r.(bool)
}
}
func (s *SmartExpression) Evaluate(expr string, params map[string]interface{}) interface{} {
if expression, err := govaluate.NewEvaluableExpression(expr); err != nil {
logs.Error("create expression failed. expr: %s, params: %v, err: %v", expr, params, err)
} else if result, err := expression.Evaluate(params); err != nil {
logs.Error("exec expression failed. expr: %s, params:%v, err: %v", expr, params, err)
} else {
return result
}
return nil
}