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;;; word-count.el --- word-count Exercise (exercism)
;;; Commentary:
(require 'cl-extra)
;;; Code:
(defun kj/extract-words (str)
(let ((pos 0)
(result nil))
(while (string-match "[[:blank:]'\"]*\\([[:alnum:]']+\\)" str pos)
(setq pos (match-end 1))
(push (match-string 1 str) result))
(nreverse result)))
(defun word-count (str)
(let* ((table (make-hash-table :test 'equal))
(result nil)
(count-word (lambda (w)
(setq w (downcase w))
(let ((count (gethash w table 0)))
(puthash w (1+ count) table))))
(push-output (lambda (w c)
(push (cons w c) result))))
(cl-mapc count-word (kj/extract-words str))
(maphash push-output table)
result))
;;; word-count.el ends here
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