April 2010 - alexandria-devel - mailman3.common-lisp.net

[alexandria-devel] `with-rebinding' macro
by Heka Treep 18 Apr '10

18 Apr '10

Hi, How about to take this macro in Alexandria? I was found it in Hunchentoot and rewrote using a simple `dolist' (instead `loop'). The patch can be found here: http://github.com/treep/alexandria/commit/13479ea033d68fc521f9eaa80d0689d61…

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[alexandria-devel] Review cycle 2: SWITCH, ESCWITCH, and CSWITCH
by Nikodemus Siivola 08 Apr '10

08 Apr '10

macro switch ((object &key test key) &body clauses) "Evaluates first matching clause, returning its values, or evaluates and returns the values of DEFAULT if no keys match." macro eswitch ((object &key test key) &body clauses) "Like SWITCH, but signals an error if no key matches." cswitch ((object &key test key) &body clauses) "Like SWITCH, but signals a continuable error if no key matches."

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[alexandria-devel] Review cycle 3: WHICHEVER, XOR
by Nikodemus Siivola 06 Apr '10

06 Apr '10

[ Starting this in spite of SWITCH still being on the table, trying to clear some others into blessed state. ] macro MULTIPLE-VALUE-PROG2 first-form second-form &body forms "Evaluates FIRST-FORM, then SECOND-FORM, and then FORMS. Yields as its value all the value returned by SECOND-FORM." macro NTH-VALUE-OR nth-value &body forms "Evaluates FORM arguments one at a time, until the NTH-VALUE returned by one of the forms is true. It then returns all the values returned by evaluating that form. If none of the forms return a true nth value, this form returns NIL." macro WHICHEVER &rest possibilities "Evaluates exactly one of POSSIBILITIES, chosen at random." macro XOR &rest datums "Evaluates its arguments one at a time, from left to right. If more then one argument evaluates to a true value no further DATUMS are evaluated, and NIL is returned as both primary and secondary value. If exactly one argument evaluates to true, its value is returned as the primary value after all the arguments have been evaluated, and T is returned as the secondary value. If no arguments evaluate to true NIL is retuned as primary, and T as secondary value." All seem fine to me -- both in terms of docstring and implementation, and they even have tests of sort. Unless there are objections during this week, I'll move them into blessed section in package.lisp. Cheers, -- Nikodemus

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[alexandria-devel] Fwd: Review cycle 2: SWITCH, ESCWITCH, and CSWITCH
by Nikodemus Siivola 06 Apr '10

06 Apr '10

Oops, missed the list in reply. ---------- Forwarded message ---------- From: Nikodemus Siivola <nikodemus(a)random-state.net> Date: 6 April 2010 10:49 Subject: Re: [alexandria-devel] Review cycle 2: SWITCH, ESCWITCH, and CSWITCH To: "Tobias C. Rittweiler" <tcr(a)freebits.de> On 6 April 2010 10:36, Tobias C. Rittweiler <tcr(a)freebits.de> wrote: > In past, I suggested to have both: Zetalisp contained a SELECT macro > which was pretty much like SWITCH with evaluating keys, iirc. http://common-lisp.net/project/bknr/static/lmman/fd-flo.xml#select cheers, -- Nikodemus

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