mirror of https://github.com/mikefarah/yq.git
108 lines
2.7 KiB
Go
108 lines
2.7 KiB
Go
package yqlib
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import (
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"bytes"
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"fmt"
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"strconv"
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logging "gopkg.in/op/go-logging.v1"
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yaml "gopkg.in/yaml.v3"
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)
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var log = logging.MustGetLogger("yq")
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type UpdateCommand struct {
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Command string
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Path string
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Value *yaml.Node
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}
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func DebugNode(value *yaml.Node) {
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if value == nil {
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log.Debug("-- node is nil --")
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} else if log.IsEnabledFor(logging.DEBUG) {
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buf := new(bytes.Buffer)
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encoder := yaml.NewEncoder(buf)
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encoder.Encode(value)
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encoder.Close()
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log.Debug("Tag: %v", value.Tag)
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log.Debug("%v", buf.String())
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}
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}
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func guessKind(tail []string, guess yaml.Kind) yaml.Kind {
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log.Debug("tail %v", tail)
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if len(tail) == 0 && guess == 0 {
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log.Debug("end of path, must be a scalar")
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return yaml.ScalarNode
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} else if len(tail) == 0 {
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return guess
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}
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var _, errorParsingInt = strconv.ParseInt(tail[0], 10, 64)
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if tail[0] == "+" || errorParsingInt == nil {
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return yaml.SequenceNode
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}
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if tail[0] == "*" && (guess == yaml.SequenceNode || guess == yaml.MappingNode) {
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return guess
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}
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if guess == yaml.AliasNode {
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log.Debug("guess was an alias, okey doke.")
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return guess
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}
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log.Debug("forcing a mapping node")
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log.Debug("yaml.SequenceNode ?", guess == yaml.SequenceNode)
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log.Debug("yaml.ScalarNode ?", guess == yaml.ScalarNode)
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return yaml.MappingNode
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}
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type YqLib interface {
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Get(rootNode *yaml.Node, path string) ([]*NodeContext, error)
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Update(rootNode *yaml.Node, updateCommand UpdateCommand) error
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New(path string) yaml.Node
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}
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type lib struct {
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navigator DataNavigator
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parser PathParser
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}
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func NewYqLib(l *logging.Logger) YqLib {
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return &lib{
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parser: NewPathParser(),
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}
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}
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func (l *lib) Get(rootNode *yaml.Node, path string) ([]*NodeContext, error) {
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var paths = l.parser.ParsePath(path)
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NavigationStrategy := ReadNavigationStrategy()
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navigator := NewDataNavigator(NavigationStrategy)
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error := navigator.Traverse(rootNode, paths)
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return NavigationStrategy.GetVisitedNodes(), error
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}
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func (l *lib) New(path string) yaml.Node {
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var paths = l.parser.ParsePath(path)
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newNode := yaml.Node{Kind: guessKind(paths, 0)}
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return newNode
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}
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func (l *lib) Update(rootNode *yaml.Node, updateCommand UpdateCommand) error {
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log.Debugf("%v to %v", updateCommand.Command, updateCommand.Path)
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switch updateCommand.Command {
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case "update":
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var paths = l.parser.ParsePath(updateCommand.Path)
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navigator := NewDataNavigator(UpdateNavigationStrategy(updateCommand.Value))
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return navigator.Traverse(rootNode, paths)
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case "delete":
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var paths = l.parser.ParsePath(updateCommand.Path)
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lastBit, newTail := paths[len(paths)-1], paths[:len(paths)-1]
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navigator := NewDataNavigator(DeleteNavigationStrategy(lastBit))
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return navigator.Traverse(rootNode, newTail)
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default:
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return fmt.Errorf("Unknown command %v", updateCommand.Command)
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}
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}
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