v0.5.3: Add substring() function to stdlib and improve logging (#21)

• Added stdlib in Python to add functions before they land upstream. Added substring
• removed warning level logging in cel crate

v0.5.1

✨ Added

• EvaluationMode enum: Control type handling behavior in CEL expressions
  • EvaluationMode.PYTHON (default for Python API): Python-friendly type promotions
  • EvaluationMode.STRICT (default for CLI): Strict CEL type rules with no coercion
• Type checking support: Added complete type stub files (.pyi) for PyO3 extension

v0.5.0: Release/0.5.0 (#8)

🚨 Breaking Changes (Rust API only)

• Upgraded cel crate (formerly cel-interpreter) 0.10.0 → 0.11.0:
  • Function registration now uses IntoFunction trait.
  • Python integration updated to use Arguments extractor for variadic args.
  • Imports renamed from cel_interpreter:: to cel::.
  • No changes to Python API – all existing code continues to work.

✨ Changed

• Internal: Refactored Python integration to match new CEL API.
• Updated dependencies:
  • pyo3: 0.25.0 → 0.25.1
  • pyo3-log: 0.12.1 → 0.12.4

🗒 Maintainer Notes

• Prepared for upcoming CEL Rust features:
  • Enhanced type system & introspection
  • type() function support
  • Optional value handling

v0.4.1

Pygments Warning in CLI Fixed

CLI REPL syntax highlighting now works without warnings

v0.4.0

🚀 CLI Interface

• Command-line tool: cel command now available after installation
• Interactive REPL: Enhanced terminal experience with syntax highlighting, auto-completion, and command history
• Multiple output formats: JSON, pretty tables, Python repr, and auto-detection
• File processing: Batch evaluation of expressions from files
• Context loading: JSON context files for complex evaluations

Command-line usage

$ cel '1 + 2'                           # → 3
$ cel --interactive                     # Launch REPL
$ cel 'age >= 21' --context user.json  # Context from file

🧪 Testing

• 200+ tests: Complete coverage of all CEL features and edge cases
• 35 new CLI tests: Formatter, REPL, file operations, and integration testing
• Performance verification: Microsecond-level evaluation benchmarks
• Error handling tests: Parser errors, type errors, and edge cases

🔧 Technical Improvements

CEL Interpreter Update

• cel-interpreter: 0.9.0 → 0.10.0 (enhanced CEL specification compliance)

PyO3 0.25.0 Migration

• Modern API: Migrated from deprecated IntoPy to IntoPyObject<'py> trait
• Better error handling: Improved type conversion with proper lifetime management
• Enhanced type safety: New conversion system with comprehensive error propagation
• Graceful degradation: Parser panics converted to proper PyValueError exceptions

Documentation

• Comprehensive Python-facing documentation with examples and type hints
• Context class: Detailed docstrings for all methods with usage examples

📦 Dependencies

• pyo3: 0.22.6 → 0.25.0
• cel-interpreter: 0.9.0 → 0.10.0
• log: 0.4.22 → 0.4.27
• chrono: 0.4.38 → 0.4.41
• pyo3-log: 0.11.0 → 0.12.1

Full Changelog: v0.3.1...v0.4.0

v0.3.1

Bug fix - support None values

v0.3.0

Adds supports for CEL expressions to use user defined Python Functions.

from cel import evaluate

def is_adult(age):
    return age > 21

evaluate("is_adult(age)", {'is_adult': is_adult, 'age': 18})
# False

Also updates pyo3 and cel-interpreter to latest stable versions.

Update to CEL v0.8.1

from cel import evaluate

expression = "age > 21"
result = evaluate(expression, {"age": 18})
print(result)  # False

evaluate("start_time + duration('1h')", {'start_time': datetime.datetime.now()})

v0.1.1

✏ Use pypi name common-expression-language

v0.1.0

🔍 Add examples