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Fix acronym with portable example solution for CI. #263

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6 changes: 2 additions & 4 deletions Makefile
Original file line number Diff line number Diff line change
Expand Up @@ -98,10 +98,8 @@ track : $(track-requirements)
# send a list of implementations to run stub-makefile tests on
ci :
#echo "(run-ci '($(implementations)))" | $(chez) -q "script/ci.ss"
# The acronym example code only works for guile. Currently, examples
# must pass for both chez and guile. list-ops and robot-name are both
# deprecated anyway.
echo "(run-all-tests 'list-ops 'robot-name 'acronym)" | $(chez) -q script/ci.ss
# list-ops and robot-name are deprecated, and their tests will fail.
echo "(run-all-tests 'list-ops 'robot-name)" | $(chez) -q script/ci.ss

clean :
find . -name "*.so" -exec rm {} \;
Expand Down
33 changes: 28 additions & 5 deletions exercises/practice/acronym/.meta/example.scm
Original file line number Diff line number Diff line change
@@ -1,7 +1,30 @@
(use-modules (ice-9 regex))
(import (rnrs))

(define (acronym text)
(apply (compose string-upcase string-append)
(map (lambda (ss)
(string-take (match:substring ss) 1))
(list-matches "[[:alpha:]|']+" text))))
(with-output-to-string
(lambda ()
(let go ((xs (string->list text)))
(let-values (((word rest)
(snoc-while relevant? (drop-while not-relevant? xs))))
(unless (null? word)
(put-char (current-output-port) (char-upcase (car word))))
(unless (null? rest)
(go rest)))))))

(define (relevant? c)
(or (char-alphabetic? c) (char=? c #\')))

(define (not-relevant? c)
(not (relevant? c)))

(define (drop-while p xs)
(cond
((null? xs) xs)
((p (car xs)) (drop-while p (cdr xs)))
(else xs)))

(define (snoc-while p xs)
(let go ((xs* xs) (taken '()))
(if (and (not (null? xs*)) (p (car xs*)))
(go (cdr xs*) (cons (car xs*) taken))
(values (reverse taken) xs*))))