yq/pkg/yqlib/operator_eval.go

43 lines
1.2 KiB
Go

package yqlib
import (
"container/list"
)
func evalOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
log.Debugf("Eval")
pathExpStrResults, err := d.GetMatchingNodes(context.ReadOnlyClone(), expressionNode.RHS)
if err != nil {
return Context{}, err
}
expressions := make([]*ExpressionNode, pathExpStrResults.MatchingNodes.Len())
expIndex := 0
//parse every expression
for pathExpStrEntry := pathExpStrResults.MatchingNodes.Front(); pathExpStrEntry != nil; pathExpStrEntry = pathExpStrEntry.Next() {
expressionStrCandidate := pathExpStrEntry.Value.(*CandidateNode)
expressions[expIndex], err = ExpressionParser.ParseExpression(expressionStrCandidate.Node.Value)
if err != nil {
return Context{}, err
}
expIndex++
}
results := list.New()
for matchEl := context.MatchingNodes.Front(); matchEl != nil; matchEl = matchEl.Next() {
for expIndex = 0; expIndex < len(expressions); expIndex++ {
result, err := d.GetMatchingNodes(context, expressions[expIndex])
if err != nil {
return Context{}, err
}
results.PushBackList(result.MatchingNodes)
}
}
return context.ChildContext(results), nil
}