Pure Python Google Common Expression Language (CEL)

Pure Python implementation of Google Common Expression Language, https://opensource.google/projects/cel.

The Common Expression Language (CEL) implements common semantics for expression evaluation, enabling different applications to more easily interoperate.

Key Applications

  • Security policy: organization have complex infrastructure and need common tooling to reason about the system as a whole

  • Protocols: expressions are a useful data type and require interoperability across programming languages and platforms.

This implementation has minimal dependencies, runs quickly, and can be embedded into Python-based applications. Specifically, one intent is to be part of Cloud Custodian (C7N) as part of the security policy filter.

Documentation Content:

Integration Overview

Interested in the API for using this package? There are three key topics:

The integration into another application is often a bit more than an import. This is because it involves combining CEL into another DSL.

The current implementation includes Cloud Custodian (C7N) integration.

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