refactored

pkg/yqlib/operator_select.go

@@ -0,0 +1,37 @@
+package yqlib
+
+import (
+	"container/list"
+)
+
+func SelectOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
+
+	log.Debugf("-- selectOperation")
+	var results = list.New()
+
+	for el := matchingNodes.Front(); el != nil; el = el.Next() {
+		candidate := el.Value.(*CandidateNode)
+
+		rhs, err := d.GetMatchingNodes(nodeToMap(candidate), pathNode.Rhs)
+
+		if err != nil {
+			return nil, err
+		}
+
+		// grab the first value
+		first := rhs.Front()
+
+		if first != nil {
+			result := first.Value.(*CandidateNode)
+			includeResult, errDecoding := isTruthy(result)
+			if errDecoding != nil {
+				return nil, errDecoding
+			}
+
+			if includeResult {
+				results.PushBack(candidate)
+			}
+		}
+	}
+	return results, nil
+}