yq/pkg/yqlib/operator_booleans.go

168 lines
4.7 KiB
Go

package yqlib
import (
"container/list"
"fmt"
yaml "gopkg.in/yaml.v3"
)
func isTruthyNode(node *yaml.Node) (bool, error) {
value := true
if node.Tag == "!!null" {
return false, nil
}
if node.Kind == yaml.ScalarNode && node.Tag == "!!bool" {
errDecoding := node.Decode(&value)
if errDecoding != nil {
return false, errDecoding
}
}
return value, nil
}
func isTruthy(c *CandidateNode) (bool, error) {
node := unwrapDoc(c.Node)
return isTruthyNode(node)
}
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
if lhs == nil && rhs == nil {
owner = &CandidateNode{}
} else if lhs == nil {
owner = rhs
}
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
}
}
log.Debugf("-- rhsTrue", rhsTrue)
return createBooleanCandidate(owner, op(lhsTrue, rhsTrue)), nil
}
}
func findBoolean(wantBool bool, d *dataTreeNavigator, context Context, expressionNode *ExpressionNode, sequenceNode *yaml.Node) (bool, error) {
for _, node := range sequenceNode.Content {
if expressionNode != nil {
//need to evaluate the expression against the node
candidate := &CandidateNode{Node: node}
rhs, err := d.GetMatchingNodes(context.SingleReadonlyChildContext(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
}
}
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)
}
booleanResult, err := findBoolean(false, d, context, expressionNode.RHS, candidateNode)
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)
}
booleanResult, err := findBoolean(true, d, context, expressionNode.RHS, candidateNode)
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) {
log.Debugf("-- orOp")
return crossFunction(d, context.ReadOnlyClone(), expressionNode, performBoolOp(
func(b1 bool, b2 bool) bool {
log.Debugf("-- peformingOrOp with %v and %v", b1, b2)
return b1 || b2
}), true)
}
func andOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
log.Debugf("-- AndOp")
return crossFunction(d, context.ReadOnlyClone(), expressionNode, performBoolOp(
func(b1 bool, b2 bool) bool {
return b1 && b2
}), true)
}
func notOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
log.Debugf("-- notOperation")
var results = list.New()
for el := context.MatchingNodes.Front(); el != nil; el = el.Next() {
candidate := el.Value.(*CandidateNode)
log.Debug("notOperation checking %v", candidate)
truthy, errDecoding := isTruthy(candidate)
if errDecoding != nil {
return Context{}, errDecoding
}
result := createBooleanCandidate(candidate, !truthy)
results.PushBack(result)
}
return context.ChildContext(results), nil
}