Support for custom yaml tags (e.g. "!include")

[akaRem]

Hi!

There is an issue in YAML plugin for VS Code redhat-developer/vscode-yaml#76
In short: custom YAML tags such as !include, !vault (and many others) that are used in Ansible, CloudFomation, JenkinsJobBuilder and many other utilities are not supported. But these tags are Language feature (see more details in attached link)

As far as I understand, the problem is somewhere in lang. server. because it's used as backend for mentioned plugin.

Could you please investigate possibilities to implement this in language server, so folks from vscode-yaml will be able to support this in plugin?

[JPinkney]

It is because the parser currently does not support custom yaml tags. I'm looking into a parser that supports both custom yaml tags and comments right now for this issue and redhat-developer/vscode-yaml#75.

[ArsLucidum]

@JPinkney Hi!

Have you been able to find any parser that can potentially add those features and replace the current one?

My company is right now developing a yaml-based language for some private needs, and we'd need support for !include tags as well as possibly comments. We're considering using this server and contributing to it, so we'd appreciate it if you can share what you've managed to investigate so far :)

[JPinkney]

@kace91 Right now the best candidate by far is https://github.com/eemeli/yaml. It has a really expressive AST and has tests against all of YAML 1.2 spec.

My only concern is that at the top of the AST readme it says this: "Does practically no error checking, and should never throw -- but if you feed it garbage, you'll likely get a garbage AST as well". That seems to be the only drawback I can find. One thing we would need to check is how this would effect the results shown to the user etc.

[JPinkney]

Added in 0.0.12 release!