Hello all,
I'm releasing a small library for using resumable exceptions, aka
conditions, in Clojure. Resumable exceptions allow the decision about what
kind of response to take to an exception to be made in a separate place
(higher up the call stack) from where the actual response itself is taken
(generally right at the place where the exception was raised). To use in a
leiningen project:
[bwo/conditions "0.1.0"]
Code:
https://github.com/bwo/conditions/
The test suite contains a translation of this example illustrating
conditions in CL <http://c2.com/cgi/wiki?CommonLispConditionSystem>:
(defn reciprocal-of [v]
(c/rtry (if (== v 0) (slingshot/throw+ {:type :zerodivisionerror}) (/ 1 v))
(c/resume-with [:type :return-zero] _ 0)
(c/resume-with [:type :return-value] {v :value} v)
(c/resume-with [:type :recalc-with] {v :value} (reciprocal-of v))))
(defn determine-infinity []
(c/rtry (let [result (reciprocal-of 0)]
(println "Value:" result)
result)
(c/resume-with [:type :continue] _ -1)))
(defn restarter [n]
(c/handle (determine-infinity)
(c/catch [:type :zerodivisionerror] _ (c/resume {:type
:recalc-with :value n}))))
(defn aborter []
(c/handle (determine-infinity)
(c/catch [:type :zerodivisionerror] _ (c/abort 0))))
Evaluating "(restarter 5)" prints "1/5" and evaluates to 1/5; evaluating
"(aborter)" doesn't print anything ("abort" jumps to the handler) and
evaluates to 0.
The README and docstrings in core.clj are fairly extensive; comments on any
aspect are welcome.
--
Ben Wolfson
"Human kind has used its intelligence to vary the flavour of drinks, which
may be sweet, aromatic, fermented or spirit-based. ... Family and social
life also offer numerous other occasions to consume drinks for pleasure."
[Larousse, "Drink" entry]
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