merge: 合并代码20241211

lib/eval/evaluate.go

@@ -5,6 +5,7 @@ import (
 	"go/ast"
 	"go/parser"
 	"go/token"
+	"math"
 	"regexp"
 	"strconv"
 	"strings"
@@ -29,6 +30,9 @@ func CalcExpr(expr string, paramValues map[string]any) (float64, error) {
 
 	// expression to evaluate
 	result, err := evalExpr(expr)
+	if math.IsNaN(result) {
+		return 0.0, err
+	}
 	return result, err
 }
 
@@ -87,6 +91,10 @@ func evalNode(node ast.Node) (float64, error) {
 		case token.MUL:
 			result = left * right
 		case token.QUO:
+			if right == 0 {
+				return math.NaN(), fmt.Errorf("divisor cannot be zero")
+			}
+
 			result = left / right
 		}
 	case *ast.BasicLit: