Use ANTLR grammar for IntelliJ IDEA code highlighting plugins? - intellij-idea

I use an ANTLRv4 grammar to parse my DSL. I would like to create a plugin to support code highlighting and code completion in IntelliJ IDEA for my DSL.
As far as I can tell, IntelliJ uses BNF and Flex formats for parsing.
Is it possible to:
use an ANTLR grammar, or
convert an ANTLR grammar to BNF and Flex ...
... to make an IntelliJ plugin for my DSL?

Updated on 2020-Dec-22
Question #1: Is it possible to directly use an ANTLR grammar to generate a JetBrains plugin for language support?
Yes, to some degree. It looks like the antlr4-intellij-adaptor library will help. I don't have firsthand experience. It describes itself as "A library to support the use of ANTLRv4 grammars for custom languages in IntelliJ-based IDEs plug-in development."
Just for clarification, a different tool, the ANTLRv4 Plugin for IntelliJ is designed to aid in the development of ANTLRv4 grammars. It does not support using an ANTLRv4 grammar to generate a lexer and parser for use by the JetBrains editors (e.g CLion, GoLand, IntelliJ, PyCharm, RubyMine, and so on).
Question #2: Is it possible to convert an ANTLR grammar to some other forms (e.g. BNF and Flex) which can be used to generate a JetBrains plugin for language support?
Yes, but this is a large topic. I would direct you to this Stack Overflow post: Are there tools to convert between ANTLR and other forms of BNF?
Related Tooling: You may find Grammar Kit by Jetbrains useful, it is "An IntelliJ IDEA plugin for language plugin developers."
Recommended Docs: Also, JetBrains provides extensive documentation on how to extend language support for its editors.

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