package yqlib import ( "container/list" "fmt" "github.com/jinzhu/copier" logging "gopkg.in/op/go-logging.v1" ) type operatorHandler func(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) type compoundCalculation func(lhs *ExpressionNode, rhs *ExpressionNode) *ExpressionNode func compoundAssignFunction(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode, calculation compoundCalculation) (Context, error) { lhs, err := d.GetMatchingNodes(context, expressionNode.LHS) if err != nil { return Context{}, err } // tricky logic when we are running *= with flags. // we have an op like: .a *=nc .b // which should roughly translate to .a =c .a *nc .b // note that the 'n' flag only applies to the multiple op, not the assignment // but the clobber flag applies to both! prefs := assignPreferences{} switch typedPref := expressionNode.Operation.Preferences.(type) { case assignPreferences: prefs = typedPref case multiplyPreferences: prefs.ClobberCustomTags = typedPref.AssignPrefs.ClobberCustomTags } assignmentOp := &Operation{OperationType: assignOpType, Preferences: prefs} for el := lhs.MatchingNodes.Front(); el != nil; el = el.Next() { candidate := el.Value.(*CandidateNode) clone := candidate.Copy() valueCopyExp := &ExpressionNode{Operation: &Operation{OperationType: referenceOpType, CandidateNode: clone}} valueExpression := &ExpressionNode{Operation: &Operation{OperationType: referenceOpType, CandidateNode: candidate}} assignmentOpNode := &ExpressionNode{Operation: assignmentOp, LHS: valueExpression, RHS: calculation(valueCopyExp, expressionNode.RHS)} _, err = d.GetMatchingNodes(context, assignmentOpNode) if err != nil { return Context{}, err } } return context, nil } func emptyOperator(_ *dataTreeNavigator, context Context, _ *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, prefs crossFunctionPreferences, rhsExp *ExpressionNode, results *list.List) error { if prefs.LhsResultValue != nil { result, err := prefs.LhsResultValue(lhsCandidate) if err != nil { return err } else if result != nil { results.PushBack(result) return nil } } rhs, err := d.GetMatchingNodes(context, rhsExp) if err != nil { return err } if prefs.CalcWhenEmpty && rhs.MatchingNodes.Len() == 0 { resultCandidate, err := prefs.Calculation(d, context, lhsCandidate, nil) if err != nil { return err } if resultCandidate != nil { results.PushBack(resultCandidate) } return nil } for rightEl := rhs.MatchingNodes.Front(); rightEl != nil; rightEl = rightEl.Next() { rhsCandidate := rightEl.Value.(*CandidateNode) if !log.IsEnabledFor(logging.DEBUG) { log.Debugf("Applying lhs: %v, rhsCandidate, %v", NodeToString(lhsCandidate), NodeToString(rhsCandidate)) } resultCandidate, err := prefs.Calculation(d, context, lhsCandidate, rhsCandidate) if err != nil { return err } if resultCandidate != nil { results.PushBack(resultCandidate) } } return nil } type crossFunctionPreferences struct { CalcWhenEmpty bool // if this returns a result node, // we wont bother calculating the RHS LhsResultValue func(*CandidateNode) (*CandidateNode, error) Calculation crossFunctionCalculation } func doCrossFunc(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode, prefs crossFunctionPreferences) (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()) if prefs.CalcWhenEmpty && lhs.MatchingNodes.Len() == 0 { err := resultsForRHS(d, context, nil, prefs, expressionNode.RHS, 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, prefs, expressionNode.RHS, 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) { prefs := crossFunctionPreferences{CalcWhenEmpty: calcWhenEmpty, Calculation: calculation} return crossFunctionWithPrefs(d, context, expressionNode, prefs) } func crossFunctionWithPrefs(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode, prefs crossFunctionPreferences) (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 { log.Debug("crossFunction evaluateAllTogether!") return doCrossFunc(d, context, expressionNode, prefs) } log.Debug("crossFunction evaluate apart!") for matchEl := context.MatchingNodes.Front(); matchEl != nil; matchEl = matchEl.Next() { innerResults, err := doCrossFunc(d, context.SingleChildContext(matchEl.Value.(*CandidateNode)), expressionNode, prefs) 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" } noob := owner.CreateReplacement(ScalarNode, "!!bool", valString) if owner.IsMapKey { noob.IsMapKey = false noob.Key = owner } return noob } 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), } }