- news! new pattern: lambda-list pattern. Contributed by akssri
- news! new pattern: number-related patterns, e.g. >, <, =, <= …
- news! Inline pattern implemented ! : @, @@ …
- news!(04/02/2016) Support for fare-quasiquote is now available. See
test/quasiquotefor the usage
- news!(04/22/2016) Added metabang-bind like macros
- news!(05/21/2016) Added support for minor implementations: CMU, ECL, CLISP, ABCL.
- news!(05/22/2016) Implemented
ARRAY-ROW-MAJOR*patterns! Multi-dimentional arrays are now more handy!
- news!(07/21/2016) Added
SPLIT*patterns! Parsing the string is more conveninent.
- news!(01/21/2017) Added
DYNAMICpattern! Careful use of this pattern can impact the performance sensitive code.
- news!(04/08/2017) Added a new contrib package
->pattern ! Offers convenient access to foreign objects.
- news!(05/26/2018) Added
property!, which only matches when the key is present in a plist.
- news!(09/06/2018) SPLIT symbol was exported from the
- news!(02/19/2019) Added
MEMBERpattern. When the argument is a constant, it also adds type declaration.
- news!(04/24/2019) Improved the compilation of
GUARDpattern. It no longer uses the internal hackery.
- news!(04/24/2019) Balland2006 optimizer is now the default optimizer for the pattern compiler!
- news!(04/28/2019) Added a
progvpattern, which can dynamically alter the dynamic variable the value will be bound to.
- news!(05/08/2019) Now the optimizer can be specified in the lexical environment via
(declare (trivia:optimizer <name>))(e.g.
(declare (trivia:optimizer :trivial))). Implemented through cltl2 API.
- news!(10/11/2019) The OR1 consistency checking algorithm in Level 1 no longer takes the exponential runtime. Compilation of type-r library is now 10x faster! (patch from @pfdietz)
- news!(01/01/2021) Added
HASH-TABLE-ENTRIESpatterns, and corresponding
!suffixed patterns for matching only if key is present in hash table.
- news!(05/30/2021 Added support for FSet. See tests for how-to.
Trivia : Trivial Pattern Matching Compiler
Trivia is a pattern matching compiler that is compatible with Optima. It shares the same testing code with Optima and acts as a drop-in replacement for 99% usage. For the basic usage, consult our wiki. Known differences between Optima and Trivia, which are bug, are described here (7/31/2016)
(defpackage :playwithit (:use :cl - :optima)) + :trivia)) (in-package :playwithit) (match '(something #(0 1 2)) ((list a (vector 0 _ b)) (values a b))) ;; --> SOMETHING, 2
Patterns compiled with Trivia runs faster than Optima.
: trivia is using :balland2006 optimiizer
… and Trivia is more extensible. In fact, Trivia’s
defpattern is able
to implement all of unmodifiable, core pattern language in Optima within itself.
(defpattern cons (a b) (with-gensyms (it) `(guard1 (,it :type cons) (consp ,it) (car ,it) ,a (cdr ,it) ,b)))
Detailed documentation is in github wiki.
Dependency & Testing
- Level 0,1 : Alexandria only.
- Level 2 : Additionally, lisp-namespace and closer-mop.
To run the tests,
(asdf:test-system :trivia) .
To run the benchmark,