support for custom tags

[tvald]

The underlying parser (yaml-ast-parser) treats unrecognized custom tags as errors. (relevant code)

Currently, there is no way to pass custom tags into yaml-ast-parser, since it's being used to generate a generic AST for later validation by VSCode's language tooling. (relevant code)

It may be more appropriate to modify yaml-ast-parser to accept a flag which disables custom tag type validation (you seem to be a contributor there as well), or perhaps this plugin can call the parser with options (such as typeMap) taken from the VSCode settings entry for the active schema.

[adamvoss]

Thanks for investigating this @tvald! I have no special relationship to yaml-ast-parser but I have had good success with that project accepting pull requests.

You probably have a better idea than I regarding which would be more desired/convenient/practical: the global opt-out or opt-in of each custom tag. Which would you want?

Either change you mentioned doesn't sound too complicated. Is this something you would be interested in working on?

The only outstanding complication I can think of would be deciding how these custom tag nodes should be represented in the VSCode AST (which also directs how JSON Schema validation would behave around them).