Pascal's 2¢

These are just some unorganized thoughts I had while working on the fringes of the codebase doing minor refactors.

Perspective

I think about this project as a language application¹ for the CQL language. Specifically, we are building a language translator from the CQL language to OHDSI Circe².

Implementation Thoughts

We have the benefit of using pieces of the CQL implementation, so we don't need to generate a parser or design an AST, because we can already use the CQFramework libraries for that. We have tools to parse high level CQL code, and there is already a specification for the AST (ELM).

Resources

• Circe docs
• Poster about converting PheKB phenotypes to Circe [abstract] [poster]
• Paper about the effect of vocabulary mapping for conditions on phenotype cohorts
• Circe discussion on OHDSI forums

References

1. Terrence Parr, Language Implementation Patterns
2. OHDSI Circe GitHub