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visitor!

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This commit is contained in:
Mike Farah 2019-12-08 15:59:24 +11:00
parent d97f1d8be2
commit 8da9a81702
1 changed files with 42 additions and 29 deletions
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71
pkg/yqlib/data_navigator.go
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@ -17,6 +17,12 @@ type navigator struct {
log *logging.Logger
}
type VisitorFn func(*yaml.Node) (*yaml.Node, error)
func identityVisitor(value *yaml.Node) (*yaml.Node, error) {
return value, nil
}
func NewDataNavigator(l *logging.Logger) DataNavigator {
return &navigator{
log: l,
@ -24,6 +30,29 @@ func NewDataNavigator(l *logging.Logger) DataNavigator {
}
func (n *navigator) Get(value *yaml.Node, path []string) (*yaml.Node, error) {
return n.Visit(value, path, identityVisitor)
}
func (n *navigator) Update(value *yaml.Node, path []string, changesToApply yaml.Node) error {
_, errorVisiting := n.Visit(value, path, func(nodeToUpdate *yaml.Node) (*yaml.Node, error) {
n.log.Debug("going to update")
n.debugNode(nodeToUpdate)
n.log.Debug("with")
n.debugNode(&changesToApply)
nodeToUpdate.Value = changesToApply.Value
nodeToUpdate.Tag = changesToApply.Tag
nodeToUpdate.Kind = changesToApply.Kind
nodeToUpdate.Style = changesToApply.Style
nodeToUpdate.Content = changesToApply.Content
nodeToUpdate.HeadComment = changesToApply.HeadComment
nodeToUpdate.LineComment = changesToApply.LineComment
nodeToUpdate.FootComment = changesToApply.FootComment
return nodeToUpdate, nil
})
return errorVisiting
}
func (n *navigator) Visit(value *yaml.Node, path []string, visitor VisitorFn) (*yaml.Node, error) {
realValue := value
if realValue.Kind == yaml.DocumentNode {
realValue = value.Content[0]
@ -31,9 +60,9 @@ func (n *navigator) Get(value *yaml.Node, path []string) (*yaml.Node, error) {
if len(path) > 0 {
n.log.Debugf("diving into %v", path[0])
n.debugNode(value)
return n.recurse(realValue, path[0], path[1:])
return n.recurse(realValue, path[0], path[1:], visitor)
}
return realValue, nil
return visitor(realValue)
}
func (n *navigator) guessKind(tail []string) yaml.Kind {
@ -72,7 +101,7 @@ func (n *navigator) debugNode(value *yaml.Node) {
}
}
func (n *navigator) recurse(value *yaml.Node, head string, tail []string) (*yaml.Node, error) {
func (n *navigator) recurse(value *yaml.Node, head string, tail []string, visitor VisitorFn) (*yaml.Node, error) {
switch value.Kind {
case yaml.MappingNode:
n.log.Debug("its a map with %v entries", len(value.Content)/2)
@ -83,38 +112,38 @@ func (n *navigator) recurse(value *yaml.Node, head string, tail []string) (*yaml
continue
}
value.Content[index+1] = n.getOrReplace(value.Content[index+1], n.guessKind(tail))
return n.Get(value.Content[index+1], tail)
return n.Visit(value.Content[index+1], tail, visitor)
}
value.Content = append(value.Content, &yaml.Node{Value: head, Kind: yaml.ScalarNode})
mapEntryValue := yaml.Node{Kind: n.guessKind(tail)}
value.Content = append(value.Content, &mapEntryValue)
n.log.Debug("adding new node %v", value.Content)
return n.Get(&mapEntryValue, tail)
return n.Visit(&mapEntryValue, tail, visitor)
case yaml.SequenceNode:
n.log.Debug("its a sequence of %v things!, %v", len(value.Content))
if head == "*" {
originalContent := value.Content
value.Content = make([]*yaml.Node, len(value.Content))
var newNode = yaml.Node{Kind: yaml.SequenceNode, Style: value.Style}
newNode.Content = make([]*yaml.Node, len(value.Content))
for index, childValue := range originalContent {
for index, childValue := range value.Content {
n.log.Debug("processing")
n.debugNode(childValue)
childValue = n.getOrReplace(childValue, n.guessKind(tail))
var nestedValue, err = n.Get(childValue, tail)
var nestedValue, err = n.Visit(childValue, tail, visitor)
n.log.Debug("nestedValue")
n.debugNode(nestedValue)
if err != nil {
return nil, err
}
value.Content[index] = nestedValue
newNode.Content[index] = nestedValue
}
return value, nil
return &newNode, nil
} else if head == "+" {
var newNode = yaml.Node{Kind: n.guessKind(tail)}
value.Content = append(value.Content, &newNode)
n.log.Debug("appending a new node, %v", value.Content)
return n.Get(&newNode, tail)
return n.Visit(&newNode, tail, visitor)
}
var index, err = strconv.ParseInt(head, 10, 64) // nolint
if err != nil {
@ -124,28 +153,12 @@ func (n *navigator) recurse(value *yaml.Node, head string, tail []string) (*yaml
return nil, nil
}
value.Content[index] = n.getOrReplace(value.Content[index], n.guessKind(tail))
return n.Get(value.Content[index], tail)
return n.Visit(value.Content[index], tail, visitor)
default:
return nil, nil
}
}
func (n *navigator) Update(dataBucket *yaml.Node, remainingPath []string, changesToApply yaml.Node) error {
nodeToUpdate, errorRecursing := n.Get(dataBucket, remainingPath)
if errorRecursing != nil {
return errorRecursing
}
nodeToUpdate.Value = changesToApply.Value
nodeToUpdate.Tag = changesToApply.Tag
nodeToUpdate.Kind = changesToApply.Kind
nodeToUpdate.Style = changesToApply.Style
nodeToUpdate.Content = changesToApply.Content
nodeToUpdate.HeadComment = changesToApply.HeadComment
nodeToUpdate.LineComment = changesToApply.LineComment
nodeToUpdate.FootComment = changesToApply.FootComment
return nil
}
// func matchesKey(key string, actual interface{}) bool {
// var actualString = fmt.Sprintf("%v", actual)
// var prefixMatch = strings.TrimSuffix(key, "*")