Support more complex index expressions (elem[key])

[radeksimko]

Use-cases

Support for traversals was added in #485 - which introduced support for simple index expressions the element is a reference and key is static (either number or string), such as aws_instance.example.tags["owner"] or aws_alb.example.access_logs[0].

Terraform however supports more complex index expressions too, where the key can a (non-static) expression, for example:

• aws_instance.example.tags[var.tag_name]

Language server currently does not support such expressions, which in practice means that:

• no completion is provided within the square brackets [ ] for variable index
• no completion is provided anywhere else within the expression
• no data is provided on hover over any expressions within such index expression (neither collection nor key)
• no tokens are highlighted within for such complex index expression or any expressions within it

Related

#1283

Proposal

Completion

TODO

Hover

TODO

Semantic Tokens

TODO

[github-actions]

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