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Transducers

1.2.0 (2024-07-20)

Added

  • lib: The find reducer now accepts an optional :default value for when nothing could be found in the transduction that matched the predicate.
  • fset: transduce implementations for set, map, seq, and bag.
  • fset: Reducers for set, map, seq, and bag.

Changed

  • lib: Conditions signalled somewhere in the transduction chain can now be caught per-item, with various restarts available to rehandle or skip the problematic item.
  • jzon: plists now write as JS objects.

1.1.1 (2024-02-08)

Fixed

  • allp and anyp now yield t in the case of success, and not just "non-nil".

1.1.0 (2024-02-02)

Added

  • New condition: no-transduce-implementation

Changed

  • If transduce is called on a type which has no defmethod for it, a custom condition is thrown with a more helpful error message.
  • The JSON support system/package is now named transducers/jzon to avoid compiler warnings.

1.0.1 (2023-12-25)

Merry Christmas! I am jetlagged and writing this at 3:30 in the morning.

Fixed

  • for-each now yields t instead of nil, since nil can interact poorly with various control structures.

1.0.0 (2023-09-07)

Added

  • An uncons transducer for splitting up a stream of cons cells.
  • A from-csv transducer to interpret a string stream as CSV data, splitting the values into a hash table.
  • An into-csv transducer that, given some headers, reverses the stream of hash tables back into strings of CSV.
  • A snoc reducer for reducing into a list without performing a final reverse.
  • A hash-table reducer for reducing into a Hash Table. Requires the transduction items to be cons cells, with car being the key and cdr being the value.
  • A plist source for transducing over key-value pairs in a Property List.
  • New conditions:
    • empty-argument
    • empty-transduction (see below)
    • imbalanced-plist
    • non-positive-integer

Changed

  • The library is now distributed under the terms of the LGPL to promote wider use.
  • Transducing over a hash-table now yields the key-value pair as a cons cell, instead of just the value. The former behaviour is considered a bug.
  • The seed argument of the fold reducer is now &optional. When missing, the first value that makes it through the transduction will be used as the seed. If the transduction turns out to be empty, then the condition empty-transduction will be raised.
  • The cons reducer now uses nreverse internally. You better not have been saving the intermediate results anywhere!
  • segment, window, and step now offer restarts when a bad initial value is passed.
  • BREAKING: average, first, and last no longer accept a fallback value. Instead, a condition is raised when the transduction was empty. This means that calls that used to look like:
(t:transduce #'t:pass (t:average 'whatever) '(1 2 3 4 5))

should now look like:

(t:transduce #'t:pass #'t:average '(1 2 3 4 5))

Likewise for first and last.

Fixed

  • List transduction fixed on Clasp. Clasp doesn't (seem to) support tail-call optimization, but it does support labels-based TCO. This is also critical for the jzon support.

Deprecated

  • max and min have been deprecated in favour of calling fold. The seed value for fold is optional now, so:
(t:transduce #'t:pass (t:fold #'max)    '(1 2 3)) ;; => 3
(t:transduce #'t:pass (t:fold #'max 10) '(1 2 3)) ;; => 10
(t:transduce #'t:pass (t:fold #'max 10) '())      ;; => 10
(t:transduce #'t:pass (t:fold #'max)    '())      ;; => Condition!

0.1.1 (2023-08-11)

Added

  • A once transducer to inject a single value into any point in the transduction chain.
  • A for-each reducer to ignore all results and just consume the stream for its side effects.

Deprecated

  • all and any should now be called as allp and anyp. The old names have been marked deprecated and you will be warned at compile time.

0.1.0 (2023-03-04)

Initial version.