Lisp in Small Parts - Anagrams Listing

; ; Anagram Solver ; from Lisp in Small Parts, http://lisp.plasticki.com/ ; Licensed under CC0 1.0: http://creativecommons.org/publicdomain/zero/1.0/ ; 2nd July 2012 ; ; First we read in the wordlist (defparameter wordlist (with-open-file (stream (capi:prompt-for-file "Wordlist:" :operation :open)) (read stream))) ; The anagram dictionary is a hash table (defparameter dict (make-hash-table :test 'string=)) ; Make anagrams (defun sorted (word) (sort (copy-seq word) 'char<)) ; Add word to the dictionary (defun add-word (word) (let* ((sword (sorted word))) (setf (gethash sword dict) (cons word (gethash sword dict))))) ; Add all words (defun add-words-to-dict (wlist) (if (null wlist) nil (let ((word (first wlist))) (add-word word) (add-words-to-dict (rest wlist))))) ; Find anagram (defun find-anagram (word) (gethash (sorted word) dict)) (defun anagram () (capi:prompt-with-list (find-anagram (capi:prompt-for-string "Find anagram:")) "Anagrams"))