evaluate bool expression

Author: skyhackvip

core/common.go

@@ -45,7 +45,7 @@ func (rule *Rule) Parse(ctx *PipelineContext, depends map[string]IFeature) (outp
 		return
 	}
 
-	var conditionRet = make(map[string]interface{}, 0)
+	var conditionRet = make(map[string]bool, 0)
 	for _, condition := range rule.Conditions {
 		if feature, ok := depends[condition.Feature]; ok {
 			rs, err := feature.Compare(condition.Operator, condition.Value)
@@ -67,7 +67,7 @@ func (rule *Rule) Parse(ctx *PipelineContext, depends map[string]IFeature) (outp
 
 	//rule.Decision
 	expr := rule.Decision.Logic
-	logicRet, err := operator.Evaluate(expr, conditionRet)
+	logicRet, err := operator.EvaluateBoolExpr(expr, conditionRet)
 	//某个表达式执行失败会导致最终逻辑执行失败
 	if err != nil {
 		return

core/conditional.go

@@ -39,7 +39,7 @@ func (conditional ConditionalNode) Parse(ctx *PipelineContext) (*NodeResult, err
 	depends := ctx.GetFeatures(info.Depends)
 	var matchBranch bool
 	for _, branch := range conditional.Branchs { //loop all the branch
-		var conditionRet = make(map[string]interface{}, 0)
+		var conditionRet = make(map[string]bool, 0)
 		for _, condition := range branch.Conditions {
 			if feature, ok := depends[condition.Feature]; ok {
 				rs, err := feature.Compare(condition.Operator, condition.Value)
@@ -55,7 +55,7 @@ func (conditional ConditionalNode) Parse(ctx *PipelineContext) (*NodeResult, err
 		if len(conditionRet) == 0 { //current branch not match
 			continue
 		}
-		logicRs, err := operator.Evaluate(branch.Decision.Logic, conditionRet)
+		logicRs, err := operator.EvaluateBoolExpr(branch.Decision.Logic, conditionRet)
 		if err != nil {
 			continue
 		}

internal/operator/logic.go

@@ -7,16 +7,12 @@ import (
 
 // evaluate 计算逻辑表达式的值
 func EvaluateBoolExpr(expr string, variables map[string]bool) (bool, error) {
-	expr = strings.ReplaceAll(expr, " ", "") // 去除空格
-	if len(expr) == 0 {
-		return false, fmt.Errorf("empty expression")
-	}
-	if !isValid(expr) {
-		return false, fmt.Errorf("invalid expression")
-	}
 
 	// 将表达式拆分成一个个token
-	tokens := splitExpression(expr)
+	tokens, err := splitExpression(expr)
+	if err != nil {
+		return false, err
+	}
 
 	// 开始执行逻辑运算
 	stack := make([]bool, 0)
@@ -126,7 +122,10 @@ func evaluateOp(b1, b2 bool, op string) bool {
 
 // isValid 检查表达式是否合法
 func isValid(expr string) bool {
-	allowed := "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!()+-*%/|&"
+	if len(expr) == 0 {
+		return false
+	}
+	allowed := "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!()+-_*%/|&,"
 	stack := make([]rune, 0)
 	for _, ch := range expr {
 		if ch == '(' {
@@ -144,9 +143,14 @@ func isValid(expr string) bool {
 }
 
 // splitExpression 将表达式拆分为token
-func splitExpression(expr string) []string {
+func splitExpression(expr string) ([]string, error) {
+	expr = strings.ReplaceAll(expr, " ", "") // 去除空格
+	if !isValid(expr) {
+		return nil, fmt.Errorf("invalid expression")
+	}
 	tokens := make([]string, 0)
 	buf := make([]rune, 0)
+
 	for i := 0; i < len(expr); i++ {
 		ch := rune(expr[i])
 		if ch == '&' && i < len(expr)-1 && rune(expr[i+1]) == '&' {
@@ -169,12 +173,18 @@ func splitExpression(expr string) []string {
 				buf = []rune{}
 			}
 			tokens = append(tokens, string(ch))
+		} else if ch == ',' {
+			if len(buf) > 0 {
+				tokens = append(tokens, string(buf))
+				buf = []rune{}
+			}
+			tokens = append(tokens, string(ch))
 		} else {
 			buf = append(buf, ch)
 		}
 	}
 	if len(buf) > 0 {
 		tokens = append(tokens, string(buf))
 	}
-	return tokens
+	return tokens, nil
 }

internal/operator/operator_test.go

@@ -56,3 +56,22 @@ func TestBoolExpr(t *testing.T) {
 	t.Log(expr, result, err)
 	t.Log(EvaluateBoolExpr("!(foo&&bar)||!a1", variables))
 }
+
+func TestSplit(t *testing.T) {
+	//t.Log(splitExpression("max(foo,bar)"))
+	//	t.Log(splitExpression("tmax(foo,bar)"))
+	//	t.Log(splitExpression("!max(foo,bar)"))
+	variables := map[string]bool{
+		"foo": true,
+		"bar": false,
+	}
+	t.Log(EvaluateExpr("max(foo,bar)", variables))
+}
+
+func TestEval(t *testing.T) {
+	variables := map[string]interface{}{
+		"foo": 1,
+		"bar": 2,
+	}
+	t.Log(Evaluate("max(foo, bar)", variables))
+}