Thanks folks!
> On May 9, 2021, at 09:38, Robby Findler <[email protected]> wrote: > > > Here's one way to write it in modern Racket: > > #lang racket > (require (for-syntax syntax/parse)) > > (module+ test (require rackunit)) > > (define-syntax (my-and stx) > (syntax-parse stx > [(_) #'#f] > [(_ e:expr) #'e] > [(_ e1:expr e2:expr ...) > #'(if e1 (my-and e2 ...) #f)])) > > (module+ test > (check-equal? (my-and) #f) > (check-equal? (my-and 1) 1) > (check-equal? (my-and 1 2) 2) > (check-equal? (my-and 1 #f 2) #f)) > > > >> On Sun, May 9, 2021 at 9:30 AM Jens Axel Søgaard <[email protected]> >> wrote: >> Hi Tim, >> >> In this case Ryan's method leads to: >> >> https://github.com/racket/racket/blob/master/racket/collects/racket/private/qq-and-or.rkt#L440 >> >> But in case you are wondering about the style used in that file: >> at the point where "qq-and-or.rkt" is used, none of the usual >> syntax tools (such as syntax-case and syntax-parse) are available, >> so it is written using only primitive constructs. >> >> That is, that particular file does not represent the usual style of macro >> writing. >> >> /Jens Axel >> >> >>> Den søn. 9. maj 2021 kl. 16.13 skrev Ryan Culpepper >>> <[email protected]>: >>> Here are the three most convenient ways I know of to find that information >>> (which is "$RACKET/collects/racket/private/qq-and-or.rkt" in this specific >>> case): >>> >>> If you use DrRacket, then open a file that uses `and`, right-click on an >>> occurrence of `and`, and choose "Open Defining File" (which changes to >>> "Jump to Definition (in Other File)" once DrRacket opens the file. >>> >>> If you use Emacs with racket-mode, go to an occurrence of `and` and hit >>> "M-." (that is, hold down Meta/Alt and press the period key). You can also >>> use "M-x racket-visit-definition". That opens the defining module and jumps >>> to the definition. >>> >>> If you have the `whereis` package installed, run the command `raco whereis >>> -b racket/base and` and it will print the path of the defining file. >>> >>> Ryan >>> >>> >>>> On Sun, May 9, 2021 at 3:26 PM Tim Meehan <[email protected]> wrote: >>>> Where in the repository are macros like "and" and "or" defined? >>>> I tried searching for "and" and "or" ... but you probably know how that >>>> worked out. >>>> >>>> Thanks folks! >>>> -- >>>> You received this message because you are subscribed to the Google Groups >>>> "Racket Users" group. >>>> To unsubscribe from this group and stop receiving emails from it, send an >>>> email to [email protected]. >>>> To view this discussion on the web visit >>>> https://groups.google.com/d/msgid/racket-users/CACgrOxK6S8EOAGk_rPbE%2B_wMLJiSbpwMhVd4AeRL8C9%2BDW3mgg%40mail.gmail.com. >>> >>> -- >>> You received this message because you are subscribed to the Google Groups >>> "Racket Users" group. >>> To unsubscribe from this group and stop receiving emails from it, send an >>> email to [email protected]. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/racket-users/CANy33q%3DsLEH-ooUJxTay6pG1GNcRLZDUotNJ23L1HRTC1XqHwA%40mail.gmail.com. >> >> >> -- >> -- >> Jens Axel Søgaard >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Racket Users" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/racket-users/CABefVgzgqRPzx6ct6LrN-TAfE18vsdqnopun0B63LmqqKxerAQ%40mail.gmail.com. -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/racket-users/5FA065BA-EFB1-424A-BDCE-7C865613EDEB%40gmail.com.
