package yqlib import ( "container/list" "fmt" "github.com/jinzhu/copier" "gopkg.in/yaml.v3" ) type operatorHandler func(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) func unwrapDoc(node *yaml.Node) *yaml.Node { if node.Kind == yaml.DocumentNode { return node.Content[0] } return node } func emptyOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) { context.MatchingNodes = list.New() return context, nil } type crossFunctionCalculation func(d *dataTreeNavigator, context Context, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) func resultsForRhs(d *dataTreeNavigator, context Context, lhsCandidate *CandidateNode, rhs Context, calculation crossFunctionCalculation, results *list.List) error { for rightEl := rhs.MatchingNodes.Front(); rightEl != nil; rightEl = rightEl.Next() { log.Debugf("Applying calc") rhsCandidate := rightEl.Value.(*CandidateNode) resultCandidate, err := calculation(d, context, lhsCandidate, rhsCandidate) if err != nil { return err } results.PushBack(resultCandidate) } return nil } func doCrossFunc(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode, calculation crossFunctionCalculation, calcWhenEmpty bool) (Context, error) { var results = list.New() lhs, err := d.GetMatchingNodes(context, expressionNode.Lhs) if err != nil { return Context{}, err } log.Debugf("crossFunction LHS len: %v", lhs.MatchingNodes.Len()) rhs, err := d.GetMatchingNodes(context, expressionNode.Rhs) if err != nil { return Context{}, err } if calcWhenEmpty && lhs.MatchingNodes.Len() == 0 { if rhs.MatchingNodes.Len() == 0 { resultCandidate, err := calculation(d, context, nil, nil) if err != nil { return Context{}, err } results.PushBack(resultCandidate) } err := resultsForRhs(d, context, nil, rhs, calculation, results) if err != nil { return Context{}, err } } for el := lhs.MatchingNodes.Front(); el != nil; el = el.Next() { lhsCandidate := el.Value.(*CandidateNode) err := resultsForRhs(d, context, lhsCandidate, rhs, calculation, results) if err != nil { return Context{}, err } } return context.ChildContext(results), nil } func crossFunction(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode, calculation crossFunctionCalculation, calcWhenEmpty bool) (Context, error) { var results = list.New() var evaluateAllTogether = true for matchEl := context.MatchingNodes.Front(); matchEl != nil; matchEl = matchEl.Next() { evaluateAllTogether = evaluateAllTogether && matchEl.Value.(*CandidateNode).EvaluateTogether if !evaluateAllTogether { break } } if evaluateAllTogether { return doCrossFunc(d, context, expressionNode, calculation, calcWhenEmpty) } for matchEl := context.MatchingNodes.Front(); matchEl != nil; matchEl = matchEl.Next() { innerResults, err := doCrossFunc(d, context.SingleChildContext(matchEl.Value.(*CandidateNode)), expressionNode, calculation, calcWhenEmpty) if err != nil { return Context{}, err } results.PushBackList(innerResults.MatchingNodes) } return context.ChildContext(results), nil } func createBooleanCandidate(owner *CandidateNode, value bool) *CandidateNode { valString := "true" if !value { valString = "false" } node := &yaml.Node{Kind: yaml.ScalarNode, Value: valString, Tag: "!!bool"} return owner.CreateChild(nil, node) } func createTraversalTree(path []interface{}, traversePrefs traversePreferences, targetKey bool) *ExpressionNode { if len(path) == 0 { return &ExpressionNode{Operation: &Operation{OperationType: selfReferenceOpType}} } else if len(path) == 1 { lastPrefs := traversePrefs if targetKey { err := copier.Copy(&lastPrefs, traversePrefs) if err != nil { panic(err) } lastPrefs.IncludeMapKeys = true lastPrefs.DontIncludeMapValues = true } return &ExpressionNode{Operation: &Operation{OperationType: traversePathOpType, Preferences: lastPrefs, Value: path[0], StringValue: fmt.Sprintf("%v", path[0])}} } return &ExpressionNode{ Operation: &Operation{OperationType: shortPipeOpType}, Lhs: createTraversalTree(path[0:1], traversePrefs, false), Rhs: createTraversalTree(path[1:], traversePrefs, targetKey), } }