Commits on Mar 19, 2023

1. anchors: Add new rule to detect undeclared or duplicated anchors …

   According to the YAML specification [^1]:
   
   - > It is an error for an alias node to use an anchor that does not
     > previously occur in the document.
   
     The `forbid-undeclared-aliases` option checks that aliases do have a
     matching anchor declared previously in the document. Since this is
     required by the YAML spec, this option is enabled by default.
   
   - > The alias refers to the most recent preceding node having the same
     > anchor.
   
     This means that having a same anchor repeated in a document is
     allowed. However users could want to avoid this, so the new option
     `forbid-duplicated-anchors` allows that. It's disabled by default.
   
   - > It is not an error to specify an anchor that is not used by any
     > alias node.
   
     This means that it's OK to declare anchors but don't have any alias
     referencing them. However users could want to avoid this, so a new
     option (e.g. `forbid-unused-anchors`) could be implemented in the
     future. See #537.
   
   Fixes #395
   Closes #420
   
   [^1]: https://yaml.org/spec/1.2.2/#71-alias-nodes

   

   adrienverge committed Mar 19, 2023
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