yq/pkg/yqlib/operator_booleans.go

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package yqlib
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import (
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"container/list"
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"fmt"
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yaml "gopkg.in/yaml.v3"
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)
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func isTruthyNode(node *yaml.Node) (bool, error) {
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value := true
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if node.Tag == "!!null" {
return false, nil
}
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if node.Kind == yaml.ScalarNode && node.Tag == "!!bool" {
errDecoding := node.Decode(&value)
if errDecoding != nil {
return false, errDecoding
}
}
return value, nil
}
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func isTruthy(c *CandidateNode) (bool, error) {
node := unwrapDoc(c.Node)
return isTruthyNode(node)
}
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type boolOp func(bool, bool) bool
func performBoolOp(op boolOp) func(d *dataTreeNavigator, context Context, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
return func(d *dataTreeNavigator, context Context, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
owner := lhs
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if lhs == nil && rhs == nil {
owner = &CandidateNode{}
} else if lhs == nil {
owner = rhs
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}
var errDecoding error
lhsTrue := false
if lhs != nil {
lhs.Node = unwrapDoc(lhs.Node)
lhsTrue, errDecoding = isTruthy(lhs)
if errDecoding != nil {
return nil, errDecoding
}
}
log.Debugf("-- lhsTrue", lhsTrue)
rhsTrue := false
if rhs != nil {
rhs.Node = unwrapDoc(rhs.Node)
rhsTrue, errDecoding = isTruthy(rhs)
if errDecoding != nil {
return nil, errDecoding
}
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}
log.Debugf("-- rhsTrue", rhsTrue)
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return createBooleanCandidate(owner, op(lhsTrue, rhsTrue)), nil
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}
}
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func findBoolean(wantBool bool, d *dataTreeNavigator, context Context, expressionNode *ExpressionNode, sequenceNode *yaml.Node) (bool, error) {
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for _, node := range sequenceNode.Content {
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if expressionNode != nil {
//need to evaluate the expression against the node
candidate := &CandidateNode{Node: node}
rhs, err := d.GetMatchingNodes(context.SingleChildContext(candidate), expressionNode)
if err != nil {
return false, err
}
if rhs.MatchingNodes.Len() > 0 {
node = rhs.MatchingNodes.Front().Value.(*CandidateNode).Node
} else {
// no results found, ignore this entry
continue
}
}
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truthy, err := isTruthyNode(node)
if err != nil {
return false, err
}
if truthy == wantBool {
return true, nil
}
}
return false, nil
}
func allOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
var results = list.New()
for el := context.MatchingNodes.Front(); el != nil; el = el.Next() {
candidate := el.Value.(*CandidateNode)
candidateNode := unwrapDoc(candidate.Node)
if candidateNode.Kind != yaml.SequenceNode {
return Context{}, fmt.Errorf("any only supports arrays, was %v", candidateNode.Tag)
}
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booleanResult, err := findBoolean(false, d, context, expressionNode.Rhs, candidateNode)
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if err != nil {
return Context{}, err
}
result := createBooleanCandidate(candidate, !booleanResult)
results.PushBack(result)
}
return context.ChildContext(results), nil
}
func anyOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
var results = list.New()
for el := context.MatchingNodes.Front(); el != nil; el = el.Next() {
candidate := el.Value.(*CandidateNode)
candidateNode := unwrapDoc(candidate.Node)
if candidateNode.Kind != yaml.SequenceNode {
return Context{}, fmt.Errorf("any only supports arrays, was %v", candidateNode.Tag)
}
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booleanResult, err := findBoolean(true, d, context, expressionNode.Rhs, candidateNode)
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if err != nil {
return Context{}, err
}
result := createBooleanCandidate(candidate, booleanResult)
results.PushBack(result)
}
return context.ChildContext(results), nil
}
func orOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
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log.Debugf("-- orOp")
return crossFunction(d, context, expressionNode, performBoolOp(
func(b1 bool, b2 bool) bool {
log.Debugf("-- peformingOrOp with %v and %v", b1, b2)
return b1 || b2
}), true)
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}
func andOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
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log.Debugf("-- AndOp")
return crossFunction(d, context, expressionNode, performBoolOp(
func(b1 bool, b2 bool) bool {
return b1 && b2
}), true)
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}
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func notOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
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log.Debugf("-- notOperation")
var results = list.New()
for el := context.MatchingNodes.Front(); el != nil; el = el.Next() {
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candidate := el.Value.(*CandidateNode)
log.Debug("notOperation checking %v", candidate)
truthy, errDecoding := isTruthy(candidate)
if errDecoding != nil {
return Context{}, errDecoding
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}
result := createBooleanCandidate(candidate, !truthy)
results.PushBack(result)
}
return context.ChildContext(results), nil
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}