diff options
| -rw-r--r-- | thogai.el | 39 |
1 files changed, 37 insertions, 2 deletions
diff --git a/thogai.el b/thogai.el index d9511ad..daa9372 100644 --- a/thogai.el +++ b/thogai.el @@ -81,6 +81,15 @@ not present in `thogai-dictionary-files'. For example, This variable is loaded from files listed in `thogai-dictionary-files' on running `thogai-load-dictionaries'.") +(defvar thogai-reverse-dictionary + (make-hash-table :test 'equal) + "Reverse steno dictionary mapping translations to strokes. + +This variable is an exact inverse of the `thogai-dictionary' hash +table. It is built when files listed in +`thogai-dictionary-files' are loaded using +`thogai-load-dictionaries'.") + (defvar thogai-stroke-ring-size 1000 "Size of `thogai-stroke-ring'. @@ -125,13 +134,18 @@ and the variable is reset to nil.") (defun thogai-load-dictionaries () "Load dictionary files in THOGAI-DICTIONARY-FILES." (interactive) - ;; Reset hash table. + ;; Reset forward and reverse dictionaries. (clrhash thogai-dictionary) + (clrhash thogai-reverse-dictionary) (let ((thogai-dictionary-longest-key 0)) (dolist (dictionary-file thogai-dictionary-files) (maphash (lambda (key value) - ;; Load key, value pair into hash table. + ;; Load keys and values into forward and reverse + ;; dictionaries. (puthash key value thogai-dictionary) + (puthash value + (cons key (gethash value thogai-reverse-dictionary)) + thogai-reverse-dictionary) ;; Update length of longest key. (setq thogai-dictionary-longest-key (max thogai-dictionary-longest-key @@ -156,6 +170,27 @@ higher precedence. If STROKE is in neither, nil is returned." (or (map-elt thogai-user-dictionary-alist stroke) (map-elt thogai-dictionary stroke))) +(defun thogai-filter-map (function sequence) + "Map FUNCTION over SEQUENCE and return only non-nil results. + +Map FUNCTION over SEQUENCE using `seq-map', but return a list of +only the non-nil results." + (seq-filter 'identity + (seq-map function sequence))) + +(defun thogai-reverse-lookup (translation) + "Lookup TRANSLATION in reverse dictionary. + +A list of all strokes producing TRANSLATION is returned. +TRANSLATION is looked up in `thogai-user-dictionary-alist' and +`thogai-reverse-dictionary'." + (append + (thogai-filter-map (pcase-lambda (`(,key . ,value)) + (and (equal value translation) + key)) + thogai-user-dictionary-alist) + (gethash translation thogai-reverse-dictionary))) + (defun thogai-longest-match (state) "Return the longest sublist of STATE that maps to a stroke. |