Initial Checkin #

• Initial release of libcel - A Dart implementation of the Common Expression Language (CEL)
• Complete CEL expression parser using PetitParser v7.0.1
• Full support for all CEL operators:
  • Arithmetic: +, -, *, /, %
  • Comparison: ==, !=, <, <=, >, >=, in
  • Logical: &&, ||, !
  • Conditional: ? :
• Comprehensive built-in function library:
  • Type conversion: int(), double(), string(), bool(), type()
  • Collection functions: size(), has(), keys(), values()
  • String functions: matches(), contains(), startsWith(), endsWith(), toLowerCase(), toUpperCase(), trim(), replace(), split()
  • Math functions: max(), min()
  • Date/time functions: timestamp(), duration(), now(), today()
• Support for complex data types:
  • Primitives (null, bool, int, double, string)
  • Lists with indexing and concatenation
  • Maps with field access and key lookup
  • Nested data structures
• Method call syntax for string and list operations
• Extensible function system for custom implementations
• Comprehensive error handling with ParseError and EvaluationError
• Full test coverage with 35+ test cases
• Complete documentation and examples
• Macro Functions: Full implementation of list comprehension functions
  • list.map(var, expression) - Transform list elements
  • list.filter(var, condition) - Filter by condition
  • list.all(var, condition) - Check if all match
  • list.exists(var, condition) - Check if any matches
  • list.existsOne(var, condition) - Check if exactly one matches
  • Support for nested macros and chaining
  • Proper variable scoping and restoration

Known Limitations #

• Protocol buffer support not yet available
• Some advanced CEL features pending implementation

Improvements for publishing #