mirror of https://github.com/mikefarah/yq.git
49 lines
1.3 KiB
Go
49 lines
1.3 KiB
Go
package treeops
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import (
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"fmt"
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"container/list"
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"gopkg.in/op/go-logging.v1"
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)
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type dataTreeNavigator struct {
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navigationPrefs NavigationPrefs
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}
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type NavigationPrefs struct {
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FollowAlias bool
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}
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type DataTreeNavigator interface {
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// given a list of CandidateEntities and a pathNode,
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// this will process the list against the given pathNode and return
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// a new list of matching candidates
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GetMatchingNodes(matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error)
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}
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func NewDataTreeNavigator(navigationPrefs NavigationPrefs) DataTreeNavigator {
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return &dataTreeNavigator{navigationPrefs}
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}
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func (d *dataTreeNavigator) GetMatchingNodes(matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
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if pathNode == nil {
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log.Debugf("getMatchingNodes - nothing to do")
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return matchingNodes, nil
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}
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log.Debugf("Processing Op: %v", pathNode.Operation.toString())
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if log.IsEnabledFor(logging.DEBUG) {
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for el := matchingNodes.Front(); el != nil; el = el.Next() {
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log.Debug(NodeToString(el.Value.(*CandidateNode)))
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}
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}
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log.Debug(">>")
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handler := pathNode.Operation.OperationType.Handler
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if handler != nil {
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return handler(d, matchingNodes, pathNode)
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}
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return nil, fmt.Errorf("Unknown operator %v", pathNode.Operation.OperationType)
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}
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