Refactoring

examples/sample.yaml

@@ -1,8 +1,9 @@
 a: Easy! as one two three
 b:
-  c:
+  c: 2
-    name: c1
+  d: [3, 4]
-    f: things
+  e:
-  d: 
+    - name: fred
-    name: d1
+      value: 3
-    f: other
+    - name: sam
+      value: 4

pkg/yqlib/data_navigator.go

@@ -87,11 +87,7 @@ func (n *navigator) guessKind(tail []string, guess yaml.Kind) yaml.Kind {
 }
 
 func (n *navigator) getOrReplace(original *yaml.Node, expectedKind yaml.Kind) *yaml.Node {
-	// expected is a scalar when we reach the end of the path
+	if original.Kind != expectedKind {
-	// no need to clobber the original because:
-	// when reading, it should deal with the original kind
-	// when writing, it will clobber the kind anyway
-	if original.Kind != expectedKind && (expectedKind != yaml.ScalarNode) {
 		n.log.Debug("wanted %v but it was %v, overriding", expectedKind, original.Kind)
 		return &yaml.Node{Kind: expectedKind}
 	}
@@ -114,6 +110,23 @@ func (n *navigator) recurse(value *yaml.Node, head string, tail []string, visito
 	case yaml.MappingNode:
 		n.log.Debug("its a map with %v entries", len(value.Content)/2)
 		if head == "*" {
+			return n.splatMap(value, tail, visitor)
+		}
+		return n.recurseMap(value, head, tail, visitor)
+	case yaml.SequenceNode:
+		n.log.Debug("its a sequence of %v things!, %v", len(value.Content))
+		if head == "*" {
+			return n.splatArray(value, tail, visitor)
+		} else if head == "+" {
+			return n.appendArray(value, tail, visitor)
+		}
+		return n.recurseArray(value, head, tail, visitor)
+	default:
+		return nil, nil
+	}
+}
+
+func (n *navigator) splatMap(value *yaml.Node, tail []string, visitor VisitorFn) (*yaml.Node, error) {
 	var newNode = yaml.Node{Kind: yaml.SequenceNode}
 	for index, content := range value.Content {
 		if index%2 == 0 {
@@ -129,6 +142,7 @@ func (n *navigator) recurse(value *yaml.Node, head string, tail []string, visito
 	return &newNode, nil
 }
 
+func (n *navigator) recurseMap(value *yaml.Node, head string, tail []string, visitor VisitorFn) (*yaml.Node, error) {
 	for index, content := range value.Content {
 		// value.Content is a concatenated array of key, value,
 		// so keys are in the even indexes, values in odd.
@@ -143,9 +157,9 @@ func (n *navigator) recurse(value *yaml.Node, head string, tail []string, visito
 	value.Content = append(value.Content, &mapEntryValue)
 	n.log.Debug("adding new node %v", value.Content)
 	return n.Visit(&mapEntryValue, tail, visitor)
-	case yaml.SequenceNode:
+}
-		n.log.Debug("its a sequence of %v things!, %v", len(value.Content))
+
-		if head == "*" {
+func (n *navigator) splatArray(value *yaml.Node, tail []string, visitor VisitorFn) (*yaml.Node, error) {
 	var newNode = yaml.Node{Kind: yaml.SequenceNode, Style: value.Style}
 	newNode.Content = make([]*yaml.Node, len(value.Content))
 
@@ -162,13 +176,16 @@ func (n *navigator) recurse(value *yaml.Node, head string, tail []string, visito
 		newNode.Content[index] = nestedValue
 	}
 	return &newNode, nil
-		} else if head == "+" {
+}
 
+func (n *navigator) appendArray(value *yaml.Node, tail []string, visitor VisitorFn) (*yaml.Node, error) {
 	var newNode = yaml.Node{Kind: n.guessKind(tail, 0)}
 	value.Content = append(value.Content, &newNode)
 	n.log.Debug("appending a new node, %v", value.Content)
 	return n.Visit(&newNode, tail, visitor)
 }
+
+func (n *navigator) recurseArray(value *yaml.Node, head string, tail []string, visitor VisitorFn) (*yaml.Node, error) {
 	var index, err = strconv.ParseInt(head, 10, 64) // nolint
 	if err != nil {
 		return nil, err
@@ -178,9 +195,6 @@ func (n *navigator) recurse(value *yaml.Node, head string, tail []string, visito
 	}
 	value.Content[index] = n.getOrReplace(value.Content[index], n.guessKind(tail, value.Content[index].Kind))
 	return n.Visit(value.Content[index], tail, visitor)
-	default:
-		return nil, nil
-	}
 }
 
 // func matchesKey(key string, actual interface{}) bool {