How to support queries for a new language

[Sucan2]

If I want to support querying a new language X, what kind of adaptations and modifications do I need to make in which modules or subfolders? Are there any development manuals and documentation?

[aeisenberg]

Creating an extractor for a new language is not a simple process. We currently don't have any documentation on how to do this. You would need to:

• Create an extractor pack that converts source code into TRAP files
• Define a db scheme that determines how the TRAP files are put into database tables
• Define a core set of queries to work with the new language.

What is the language you want to do this for and what is your use case?

[Sucan2]

I want to combine CodeQL with CPG, so I would like to know the principles of CodeQL when performing queries and which interfaces and methods are called during the query execution.

[aeisenberg]

Have you read the codeql language reference and the codeql capture the flag exercises?

[Sucan2]

Thank you for your reply. yes, I've read QL language reference recently, and I've written a few queries and checked the query logs, but I don't have any idea of using codeql ql to query CPG(Code Property Graph), what should I do?

[aeisenberg]

We don't have any public documentation on how to create an extractor for a new language. Though, I'm not exactly sure what you are trying to do. It sounds like you have Code Property Graph data for a program that you want to add to a database? Which language are you working in?

[Sucan2]

I want to store CPG of multiple languages into the database and then perform queries through QL. I came to know that due to the unavailability of the parsing engine part as open source in Codeql, this task can not be achieved.