Hacktoberfest 2026 : les issues que les mainteneurs ont marquées pour octobre, ouvertes et accessibles aux débutants. Parcourir les issues Hacktoberfest

Nil tag with implicit: false raises error on SnakeYAML

Ouverte
  • Quelque chose ne va pas ?
#500 1 commentaire 0 réactions 0 personnes assignées Voir sur GitHub

Personne n'a encore pris cette issue.

Évaluation

Difficulté
4/5
Temps estimé
3-5 jours
Accessibilité débutants
25/100
Type d'issue
Bug
Clarté
À clarifier
Activité
À l'abandon
Stack technique
java, ruby
Domaine
tooling

Piste de recherche

Commencez dans lib/psych/visitors/yaml_tree.rb vers la ligne 520 et suivez le tag nil et la valeur implicite jusqu’à l’emitter, y compris org/jruby/ext/psych/PsychEmitter.java. Reproduisez les tests de #475 ou les échecs restants dans JRuby PR #6680, puis vérifiez que le dump du mapping concerné ne déclenche plus l’erreur de tag de SnakeYAML.

Rédigé par le modèle d'indexation à partir du texte de l'issue.

Description

JRuby

The following line, when reached by the tests from #475, triggers SnakeYAML to raise an error:

https://github.com/ruby/psych/blob/546154ddb71b125794c5eed36817ad27ac373dd5/lib/psych/visitors/yaml_tree.rb#L520

The error:

RuntimeError: org.yaml.snakeyaml.emitter.EmitterException: tag is not specified
                      scalar at org/jruby/ext/psych/PsychEmitter.java:206
    visit_Psych_Nodes_Scalar at /Users/headius/projects/jruby/lib/ruby/stdlib/psych/visitors/emitter.rb:32
                       visit at /Users/headius/projects/jruby/lib/ruby/stdlib/psych/visitors/visitor.rb:30
                      accept at /Users/headius/projects/jruby/lib/ruby/stdlib/psych/visitors/visitor.rb:6
   visit_Psych_Nodes_Mapping at /Users/headius/projects/jruby/lib/ruby/stdlib/psych/visitors/emitter.rb:43
                        each at org/jruby/RubyArray.java:1864
   visit_Psych_Nodes_Mapping at /Users/headius/projects/jruby/lib/ruby/stdlib/psych/visitors/emitter.rb:43
                       visit at /Users/headius/projects/jruby/lib/ruby/stdlib/psych/visitors/visitor.rb:30
                      accept at /Users/headius/projects/jruby/lib/ruby/stdlib/psych/visitors/visitor.rb:6
  visit_Psych_Nodes_Document at /Users/headius/projects/jruby/lib/ruby/stdlib/psych/visitors/emitter.rb:27
                        each at org/jruby/RubyArray.java:1864
  visit_Psych_Nodes_Document at /Users/headius/projects/jruby/lib/ruby/stdlib/psych/visitors/emitter.rb:27
                       visit at /Users/headius/projects/jruby/lib/ruby/stdlib/psych/visitors/visitor.rb:30
                      accept at /Users/headius/projects/jruby/lib/ruby/stdlib/psych/visitors/visitor.rb:6
    visit_Psych_Nodes_Stream at /Users/headius/projects/jruby/lib/ruby/stdlib/psych/visitors/emitter.rb:21
                        each at org/jruby/RubyArray.java:1864
    visit_Psych_Nodes_Stream at /Users/headius/projects/jruby/lib/ruby/stdlib/psych/visitors/emitter.rb:21
                       visit at /Users/headius/projects/jruby/lib/ruby/stdlib/psych/visitors/visitor.rb:30
                      accept at /Users/headius/projects/jruby/lib/ruby/stdlib/psych/visitors/visitor.rb:6
                        yaml at /Users/headius/projects/jruby/lib/ruby/stdlib/psych/nodes/node.rb:61
                        dump at /Users/headius/projects/jruby/lib/ruby/stdlib/psych.rb:515
                      <main> at blah.rb:13

As far as I can tell, the issue is that the tag is nil and implicit is false, which is prohibited in SnakeYAML for a mapping.

This is somewhat outside my understanding of YAML and I am not sure whether this constitutes an improper behavioral difference in SnakeYAML or not.

The implicit value comes from the default @implicit of Coder, and is never set to true in the logic hit by the tests mentioned above. As it stands I do not know how to reconcile the values being passed in with the SnakeYAML hard error.

This leads to the remaining failures in https://github.com/jruby/jruby/pull/6680, which I will exclude to proceed with the Psych update.

Langage dominant
Ruby
Étoiles
596
Forks
224
Merge moyen
5 h 50 min
PR mergées (30 j)
3

Préparer son environnement

Par où commencer

  1. Lisez l'issue en entier, puis le guide de contribution du projet.
  2. Signalez en commentaire que vous la prenez — cela évite que deux personnes fassent le même travail.
  3. Forkez le dépôt et travaillez sur une branche.
  4. Ouvrez une pull request qui référence le numéro de l'issue.

Autres issues de ruby/psych

Toutes les issues de ruby/psych

Issues similaires

Plus d'issues Ruby

Recevez les nouvelles issues par e-mail

Un résumé court des issues GitHub adaptées aux débutants.