Changelog

Unreleased

0.13.0 (2019-09-29)

Added

  • match.function and match.Property decorators for Haskell-style function definitions.

Fixed

  • Accessing data descriptors on Sum and Product instances.

0.12.1 (2019-09-04)

Added

  • Product classes can make use of custom __new__.

0.12.0 (2019-09-03)

Added

  • Product base class

Changed

  • Improved documentation of some match constructors.
  • Exposed MatchDict type, so it gets documented.
  • Converted the adt decorator to a Sum base class.

Removed

  • Guard type removed in favor of user-defined validation functions.

0.11.1 (2019-03-23)

Changed

  • Restore proper behavior of __new__ overrides.

0.11.0 (2019-03-23)

Changed

  • Consider all overrides of checked dunder methods, not just those in the decorated class.

0.10.1 (2019-03-22)

Added

  • A non-ergonomic but simple wrapper class for use by the typing plugin. It’s not available to runtime code.

0.10.0 (2019-03-21)

Changed

  • Actually, the facade was working, I was just confused. Restored the facade.

0.9.0 (2019-03-20)

Changed

  • Removed the facade.
  • Added stability guarantee to Ctor.

0.8.0 (2019-03-19)

Changed

  • Rewrote the facade.

0.7.0 (2019-03-19)

Changed

  • Tried to put up a facade for type analysis. It didn’t work.

0.6.1 (2019-03-18)

Added

  • Bind class for attaching extra data to a match structure.
  • PEP 561 support.

Changed

  • As-patterns are now formed with indexing instead of the @ operator.
  • AttrPattern and DictPattern now take keyword arguments instead of a dict argument, and form new versions of themselves with an alter method.
  • Actually. Change DictPattern back, stop trying to keep these things in synch.

0.6.0 (2018-07-27)

Added

  • AttrPattern and DictPattern classes that take a dict argument and perform destructuring match against arbitrary objects, and mappings, respectively.

Changed

  • Added special handling for matching AsPatterns against different AsPatterns. This is subject to change, as it’s definitely an edge case.

0.5.0 (2018-07-22)

Added

  • Matchable class is now callable and indexable. Calling is forwarded to the match method, and indexing forwards to the matches attribute, if it exists, and raises an error otherwise.
  • Matchable class now has custom coercion to bool: False if the last match attempt failed, True otherwise.

Changed

  • Renamed enum to adt to avoid confusion.
  • Renamed ValueMatcher to Matchable.
  • Matchable.match now returns the Matchable instance, which can then be coerced to bool, or indexed directly.

0.4.0 (2018-07-21)

Added

  • Mapping class especially for match values. It’s capable of quickly and concisely pulling out groups of variables, but it also properly supports extracting just a single value.
  • Mapping class can now index from a dict to a dict, in order to support **kwargs unpacking.

Fixed

  • A bug (not present in any released version) that caused the empty tuple target to accept any tuple value. This is included partly because this was just such a weird bug.

Removed

  • Unpublished the MatchFailure exception type, and the desugar function.

0.3.0 (2018-07-15)

Added

  • Simpler way to create match bindings.
  • Dependency on the astor library.
  • First attempt at populating the annotations and signature of the generated constructors.
  • data module containing some generic algebraic data types.
  • Attempts at monad implementations for data classes.

Changed

  • Broke the package into many smaller modules.
  • Switched many attributes to use a WeakKeyDictionary instead.
  • Moved prewritten methods into a class to avoid defining reserved methods at the module level.
  • When assigning equality methods is disabled for a decorated class, the default behavior is now object semantics, rather than failing comparison and hashing with a TypeError.
  • The prewritten comparison methods no longer return NotImplemented.

Removed

  • Ctor metaclass.

0.2.1 (2018-07-13)

Fixed

  • Removed an incorrect classifier. This code cannot run on pypy.

0.2.0 (2018-07-13)

Added

  • Explicit __bool__ implementation, to consider all constructor instances as truthy, unless defined otherwise.
  • Python 3.7 support.

Changed

  • Marked the enum constructor base class as private. (EnumConstructor -> _EnumConstructor)
  • Switched scope of test coverage to supported versions. (Python 3.7)

Removed

  • Support for Python 3.6 and earlier.
  • Incidental functionality required by supported Python 3.6 versions. (Hooks to enable restricted subclassing.)

0.1.0 (2018-06-10)

  • First release on PyPI.