mirror of https://github.com/mikefarah/yq.git
76 lines
2.2 KiB
Go
76 lines
2.2 KiB
Go
package yqlib
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import (
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"container/list"
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)
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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 {
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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
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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
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EvaluateCandidateNodes(expression string, inputCandidateNodes *list.List) (*list.List, error)
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}
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type allAtOnceEvaluator struct {
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treeNavigator DataTreeNavigator
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}
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func NewAllAtOnceEvaluator() Evaluator {
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InitExpressionParser()
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return &allAtOnceEvaluator{treeNavigator: NewDataTreeNavigator()}
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}
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func (e *allAtOnceEvaluator) EvaluateNodes(expression string, nodes ...*CandidateNode) (*list.List, error) {
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inputCandidates := list.New()
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for _, node := range nodes {
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inputCandidates.PushBack(node)
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}
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return e.EvaluateCandidateNodes(expression, inputCandidates)
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}
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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 {
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return nil, err
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}
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context, err := e.treeNavigator.GetMatchingNodes(Context{MatchingNodes: inputCandidates}, node)
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if err != nil {
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return nil, err
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}
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return context.MatchingNodes, nil
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}
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func (e *allAtOnceEvaluator) EvaluateFiles(expression string, filenames []string, printer Printer, decoder Decoder) error {
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fileIndex := 0
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var allDocuments = list.New()
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for _, filename := range filenames {
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reader, err := readStream(filename)
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if err != nil {
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return err
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}
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fileDocuments, err := readDocuments(reader, filename, fileIndex, decoder)
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if err != nil {
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return err
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}
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allDocuments.PushBackList(fileDocuments)
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fileIndex = fileIndex + 1
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}
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if allDocuments.Len() == 0 {
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candidateNode := createScalarNode(nil, "")
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allDocuments.PushBack(candidateNode)
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}
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matches, err := e.EvaluateCandidateNodes(expression, allDocuments)
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if err != nil {
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return err
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}
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return printer.PrintResults(matches)
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}
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