Release notes for CEL Python (cel-expr-python) version 0.1.2

Key Highlights

• Platform Compatibility Expansion: Initial support for Microsoft Windows and macOS environments, complete with dedicated CI/CD presubmit pipelines and automated wheel releases using cibuildwheel.
• Expression Container Aliases & Abbreviations: Added support for namespace resolution in the environment via the new cel.ExpressionContainer class.
• Simplified User-defined Functions: Enabled registration of custom functions written in Python directly via cel.NewEnv(functions=[...]).
• Type Stub Annotations (.pyi): Added robust inline type stubs for improved IDE auto-completion and static type checking.

Detailed Change Log

1. Multi-Platform & Build Infrastructure Support

• Windows Support: Added Microsoft Windows build support. Configured modern C++ standards compilation (/std:c++20) for MSVC compiler.
• macOS Support: Configured Apple macOS build pipeline.
• cibuildwheel Optimization: Updated release scripts to support Python 3.11, 3.12, 3.13, and 3.14 wheel compiles.

2. Namespace Resolution (cel.ExpressionContainer)

• Container Aliases: Added cel.ExpressionContainer class to pass to cel.NewEnv(container=...). Allows binding aliases to fully qualified names (e.g., aliases={"abc": "x.y.bar"}) and defining namespace abbreviations.

3. Custom Functions Declarations

• cel.FunctionDecl & cel.Overload: Added dedicated classes for custom function binding. You can now define custom behaviors and overload resolutions in Python:

  cel_env = cel.NewEnv(
      functions=[
          cel.FunctionDecl("hello", [
              cel.Overload("hello(string)", cel.Type.STRING, [cel.Type.STRING], impl=lambda x: f"Hello {x}!")
          ])
      ]
  )

• Separate Implementation Binding: Supported binding overloads dynamically using NewEnv(functions=[...], function_impls={"overload_id": handler}).

4. Extension Changes & Refactoring

• ext_strings Renaming: Renamed Python strings extension from ext_string to ext_strings to align with internal conventions.
• Compiler Library Migration: Refactored C++ extension interface from using ConfigureCompiler to returning cel::CompilerLibrary via GetCompilerLibrary(), harmonizing between standard and custom extension definitions.

Full Changelog: v0.1.1...0.1.2---

Initial release of CEL-expr-python, wrapper over CEL-C++

Features:

• Compilation
• Evaluation of a type-checked expression
• Support for Protobuf
• Standard extensions: math, strings, optional, bindings etc
• Support for custom extensions, written in Python or C++