yq/pkg/yqlib/operator_assign.go

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package yqlib
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type assignPreferences struct {
DontOverWriteAnchor bool
OnlyWriteNull bool
}
func assignUpdateFunc(prefs assignPreferences) crossFunctionCalculation {
return func(d *dataTreeNavigator, context Context, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
rhs.Node = unwrapDoc(rhs.Node)
if !prefs.OnlyWriteNull || lhs.Node.Tag == "!!null" {
lhs.UpdateFrom(rhs, prefs)
}
return lhs, nil
}
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}
func assignUpdateOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
lhs, err := d.GetMatchingNodes(context, expressionNode.LHS)
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if err != nil {
return Context{}, err
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}
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prefs := assignPreferences{}
// they way *= (multipleAssign) is handled, we set the multiplePrefs
// on the node, not assignPrefs. Long story.
if p, ok := expressionNode.Operation.Preferences.(assignPreferences); ok {
prefs = p
}
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if !expressionNode.Operation.UpdateAssign {
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// this works because we already ran against LHS with an editable context.
_, err := crossFunction(d, context.ReadOnlyClone(), expressionNode, assignUpdateFunc(prefs), false)
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return context, err
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}
for el := lhs.MatchingNodes.Front(); el != nil; el = el.Next() {
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candidate := el.Value.(*CandidateNode)
rhs, err := d.GetMatchingNodes(context.SingleChildContext(candidate), expressionNode.RHS)
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if err != nil {
return Context{}, err
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}
// grab the first value
first := rhs.MatchingNodes.Front()
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if first != nil {
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rhsCandidate := first.Value.(*CandidateNode)
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rhsCandidate.Node = unwrapDoc(rhsCandidate.Node)
candidate.UpdateFrom(rhsCandidate, prefs)
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}
}
return context, nil
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}
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// does not update content or values
func assignAttributesOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
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log.Debug("getting lhs matching nodes for update")
lhs, err := d.GetMatchingNodes(context, expressionNode.LHS)
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if err != nil {
return Context{}, err
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}
for el := lhs.MatchingNodes.Front(); el != nil; el = el.Next() {
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candidate := el.Value.(*CandidateNode)
rhs, err := d.GetMatchingNodes(context.SingleReadonlyChildContext(candidate), expressionNode.RHS)
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if err != nil {
return Context{}, err
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}
// grab the first value
first := rhs.MatchingNodes.Front()
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if first != nil {
prefs := assignPreferences{}
if expressionNode.Operation.Preferences != nil {
prefs = expressionNode.Operation.Preferences.(assignPreferences)
}
if !prefs.OnlyWriteNull || candidate.Node.Tag == "!!null" {
candidate.UpdateAttributesFrom(first.Value.(*CandidateNode), prefs)
}
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}
}
return context, nil
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}