yq/pkg/yqlib/all_at_once_evaluator.go

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package yqlib
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import (
"container/list"
)
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// A yaml expression evaluator that runs the expression once against all files/nodes in memory.
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type Evaluator interface {
EvaluateFiles(expression string, filenames []string, printer Printer, decoder Decoder) error
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// EvaluateNodes takes an expression and one or more yaml nodes, returning a list of matching candidate nodes
EvaluateNodes(expression string, nodes ...*CandidateNode) (*list.List, error)
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// EvaluateCandidateNodes takes an expression and list of candidate nodes, returning a list of matching candidate nodes
EvaluateCandidateNodes(expression string, inputCandidateNodes *list.List) (*list.List, error)
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}
type allAtOnceEvaluator struct {
treeNavigator DataTreeNavigator
}
func NewAllAtOnceEvaluator() Evaluator {
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InitExpressionParser()
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return &allAtOnceEvaluator{treeNavigator: NewDataTreeNavigator()}
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}
func (e *allAtOnceEvaluator) EvaluateNodes(expression string, nodes ...*CandidateNode) (*list.List, error) {
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inputCandidates := list.New()
for _, node := range nodes {
inputCandidates.PushBack(node)
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}
return e.EvaluateCandidateNodes(expression, inputCandidates)
}
func (e *allAtOnceEvaluator) EvaluateCandidateNodes(expression string, inputCandidates *list.List) (*list.List, error) {
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node, err := ExpressionParser.ParseExpression(expression)
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if err != nil {
return nil, err
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}
context, err := e.treeNavigator.GetMatchingNodes(Context{MatchingNodes: inputCandidates}, node)
if err != nil {
return nil, err
}
return context.MatchingNodes, nil
}
func (e *allAtOnceEvaluator) EvaluateFiles(expression string, filenames []string, printer Printer, decoder Decoder) error {
fileIndex := 0
var allDocuments = list.New()
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for _, filename := range filenames {
reader, err := readStream(filename)
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if err != nil {
return err
}
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fileDocuments, err := readDocuments(reader, filename, fileIndex, decoder)
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if err != nil {
return err
}
allDocuments.PushBackList(fileDocuments)
fileIndex = fileIndex + 1
}
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if allDocuments.Len() == 0 {
candidateNode := createScalarNode(nil, "")
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allDocuments.PushBack(candidateNode)
}
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matches, err := e.EvaluateCandidateNodes(expression, allDocuments)
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if err != nil {
return err
}
return printer.PrintResults(matches)
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}