changed the structer of the selector components: now all case are a list value assigned as right operand of the selector operator

operand-list.go

@@ -5,11 +5,15 @@
 package expr
 
 // -------- list term
+func newListTermA(args ...*term) *term {
+	return newListTerm(args)
+}
+
 func newListTerm(args []*term) *term {
 	return &term{
-		tk:       *NewToken(0, 0, SymList, "[]"),
+		tk:       *NewValueToken(0, 0, SymList, "[]", args),
 		parent:   nil,
-		children: args,
+		children: nil,
 		position: posLeaf,
 		priority: priValue,
 		evalFunc: evalList,
@@ -18,8 +22,9 @@ func newListTerm(args []*term) *term {
 
 // -------- list func
 func evalList(ctx ExprContext, self *term) (v any, err error) {
-	items := make([]any, len(self.children))
-	for i, tree := range self.children {
+	list, _ := self.value().([]*term)
+	items := make([]any, len(list))
+	for i, tree := range list {
 		var param any
 		if param, err = tree.compute(ctx); err != nil {
 			break
@@ -31,3 +36,31 @@ func evalList(ctx ExprContext, self *term) (v any, err error) {
 	}
 	return
 }
+
+// // -------- list term
+// func newListTerm(args []*term) *term {
+// 	return &term{
+// 		tk:       *NewToken(0, 0, SymList, "[]"),
+// 		parent:   nil,
+// 		children: args,
+// 		position: posLeaf,
+// 		priority: priValue,
+// 		evalFunc: evalList,
+// 	}
+// }
+
+// // -------- list func
+// func evalList(ctx ExprContext, self *term) (v any, err error) {
+// 	items := make([]any, len(self.children))
+// 	for i, tree := range self.children {
+// 		var param any
+// 		if param, err = tree.compute(ctx); err != nil {
+// 			break
+// 		}
+// 		items[i] = param
+// 	}
+// 	if err == nil {
+// 		v = items
+// 	}
+// 	return
+// }