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author | Rob Browning <rlb@defaultvalue.org> | 2024-07-17 21:08:01 -0500 |
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committer | Rob Browning <rlb@defaultvalue.org> | 2024-07-30 19:28:37 -0500 |
commit | 58246aee24be908307117b3f8ae8040460f86ce7 (patch) | |
tree | 1c731b1b7cc27feddf4ba5156042da647525846c /module/srfi/srfi-1.scm | |
parent | 372a52e6aa22ac255d8607c9e4f4f43864218440 (diff) | |
download | guile-58246aee24be908307117b3f8ae8040460f86ce7.tar.gz |
srfi-1 count: move from C to Scheme
* libguile/srfi-1.c (scm_srfi1_count): delete.
* libguile/srfi-1.h (scm_srfi1_count): delete.
* module/srfi/srfi-1.scm: add count.
Diffstat (limited to 'module/srfi/srfi-1.scm')
-rw-r--r-- | module/srfi/srfi-1.scm | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/module/srfi/srfi-1.scm b/module/srfi/srfi-1.scm index 31623cdc6..2ecdcd7ff 100644 --- a/module/srfi/srfi-1.scm +++ b/module/srfi/srfi-1.scm @@ -546,6 +546,27 @@ result. This is equivalent to @code{(append! (reverse! @var{rev-head}) (values (map first l) (map second l) (map third l) (map fourth l) (map fifth l))) +(define count + (case-lambda + ((pred lst) + (let lp ((lst lst) (c 0)) + (if (null? lst) + c + (lp (cdr lst) (if (pred (car lst)) (1+ c) c))))) + ((pred l1 l2) + (let lp ((l1 l1) (l2 l2) (c 0)) + (if (or (null? l1) (null? l2)) + c + (lp (cdr l1) (cdr l2) + (if (pred (car l1) (car l2)) (1+ c) c))))) + ((pred lst . lists) + (let lp ((lst lst) (lists lists) (c 0)) + (if (or (null? lst) (any null? lists)) + c + (lp (cdr lst) + (map cdr lists) + (if (apply pred (car lst) (map car lists)) (1+ c) c))))))) + ;;; Fold, unfold & map (define fold |