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language.lisp
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language.lisp
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(in-package :alice)
;; functions related to language processing
(defparameter *min-nick-length-for-stem-match* 4)
(define-constant +regexp-special-characters+ ".^$*+?()[{\|\\" :test #'string=)
(define-constant
+regexp-escape-special-characters-regexp-part+
(concatenate 'string
"(["
(coerce (mapcan (lambda (x) (list #\\ x))
(coerce +regexp-special-characters+ 'list))
'string)
"])")
:test #'string=)
(defun stem-matches-p (word-checked target)
(and (stringp word-checked)
(stringp target)
(let* ((lowcase-word-checked (string-downcase word-checked))
(lowcase-target (string-downcase target))
(len (length lowcase-target))
(suffixless-target (subseq lowcase-target 0 (- len 1))))
(if (< len *min-nick-length-for-stem-match*)
(equalp lowcase-word-checked lowcase-target)
(or (equalp lowcase-word-checked lowcase-target)
(equalp lowcase-word-checked suffixless-target)
(matches-regexp-p (make-stem-regexp lowcase-target) lowcase-word-checked)
(matches-regexp-p (make-stem-regexp suffixless-target) lowcase-word-checked))))))
(defun make-stem-regexp (base-word)
(concatenate 'string "^" (escape-for-regexp base-word) "(y|i|a|ie|owi|e|ę|iowi|ce)$"))
(defun matches-regexp-p (regexp string)
(not (null (cl-ppcre:scan regexp string))))
(defun escape-for-regexp (text)
(cl-ppcre:regex-replace-all +regexp-escape-special-characters-regexp-part+ text "\\\\\\1"))
;;; stems
;; wiktor owi
;; wiktor a
;; marchew ie
;; marchew e
;; marchew ę
;; dreadlish owi
;; functions related to time formatting
;; TODO if switching to feature/style, this looks like something to be factored out to it's own file!
(defparameter *date-difference-strings*
'((:today . ("dzisiaj" "dziś"))
;;
(:yesterday . ("wczoraj"))
(:two-days-ago . ("przedwczoraj" "dwa dni temu"))
(:three-days-ago . ("trzy dni temu"))
;;
(:tomorrow . ("jutro"))
(:day-after-tomorrow . ("pojutrze"))
;;
(:monday . ("w poniedziałek"))
(:tuesday . ("we wtorek"))
(:wednesday . ("w środę"))
(:thursday . ("w czwartek"))
(:friday . ("w piątek"))
(:saturday . ("w sobotę"))
(:sunday . ("w niedzielę"))))
(defparameter *days-of-week* #(:monday :tuesday :wednesday :thursday :friday :saturday :sunday))
(defparameter *days-offset-alist* '((0 . :today)
(1 . :yesterday)
(2 . :two-days-ago)
(3 . :three-days-ago)
(-1 . :tomorrow)
(-2 . :day-after-tomorrow)))
(defvar +timestring-format+ '((:DAY 2) #\. (:MONTH 2) #\. (:YEAR 4) #\ (:HOUR 2) #\: (:MIN 2) #\: (:SEC 2)))
(defvar +timestring-date-format+ '((:DAY 2) #\. (:MONTH 2) #\. (:YEAR 4)))
(defvar +timestring-time-format+ '((:HOUR 2) #\: (:MIN 2) #\: (:SEC 2)))
;; DAYS
(defun days-diff (time-a time-b) ;FIXME should go to some sort of date utils
"Compute the difference in calendar days between `TIME-A' and `TIME-B'."
(- (local-time:day-of (local-time:timestamp-minimize-part time-a :hour))
(local-time:day-of (local-time:timestamp-minimize-part time-b :hour))))
(defun fix-day-of-week-offset (offset)
(mod (1- offset) 7))
(defun timestamp-day-of-week (timestamp)
(local-time:with-decoded-timestamp (:day-of-week d-o-w) timestamp d-o-w))
(defun get-date-day-of-week-phrase (timestamp reference)
(let ((days-offset (days-diff reference timestamp))
(day-of-week (fix-day-of-week-offset (timestamp-day-of-week timestamp))))
(when (and (> days-offset 0)
(< days-offset 7))
(elt *days-of-week* day-of-week))))
(defun get-relative-date-difference-phrase (time-a time-b)
"Compute natural-language date difference of days between timestamps `TIME-A' and `TIME-B'. Return a proper symbol or NIL if no natural-language representation is available."
(let ((days-offset (days-diff time-a time-b)))
(cdr (assoc days-offset *days-offset-alist*))))
(defun format-date (timestamp &optional (reference (local-time:now)))
(let ((phrase (or (get-relative-date-difference-phrase reference timestamp)
(get-date-day-of-week-phrase timestamp reference))))
(if phrase (alexandria:random-elt (cdr (assoc phrase *date-difference-strings*))) ;FIXME use say-equivalent or sth
(local-time:format-timestring nil timestamp :format +timestring-date-format+))))
;; TIME
(defun format-time (timestamp)
(local-time:format-timestring nil timestamp :format +timestring-time-format+))
(defparameter *timestring-preprocessing-mappings*
`(("\\bjed(e|(en|n[aą])\\b)" . "1")
("\\bp[oó][lł]tor(a|ej)\\b" . "1.5")
("\\bdw(a|ie\\b)" . "2")
("\\btrzy" . "3")
("\\bcztery?" . "4")
("\\bpi[eę][cćt]" . "5")
("\\bsze[sś][cć]" . "6")
("\\bsiedem" . "7")
("\\bosiem" . "8")
("\\bdziewi[eę][cćt]" . "9")
("\\bdziesi[eę][cć]\\b" . "10")
; ("na[sś]cie\\b" . "1") ;; no idea how to prepend with "1"
("dzie([sś]cia?|si[aą]t)\\b" . "0")
;; also no idea what with "pięćdziesiąt sześć"
("\\bsto\\b" . "100")
("\\bdwie[sś]cie\\b" . "200")
("s(ta|et)\\b" . "00")
("\\btysi[aą]c\\b" . "1000")
("\\btysi[aąeę]c[ey]\\b" . "000") ;; not really sure about this...
("\\bteraz\\b" . "now")
("\\bdzi(ś|s|siaj)\\b" . "today")
("\\bjutro\\b" . "tomorrow")
("\\bpojutrze\\b" . "day after tomorrow")
("\\brano\\b" . "06:00")
("\\bw po[lł]udnie\\b" . "12:00")
("\\bpo po(ł|l)udniu\\b" . "14:00")
("\\bwiecz(o|ó)r(em)?\\b" . "17:00")
("\\b(o|w) p[oó][lł]nocy?\\b" . "0:00")
("\\bp(o|ó)(l|ł) godziny\\b" . "30 minutes")
("\\bp(o|ó)(l|ł) minuty\\b" . "30 seconds")
("\\bp(o|ó)(l|ł) dnia\\b" . "6 hours")
("\\bp(o|ó)(l|ł) miesi(a|ą)ca\\b" . "15 days")
("\\bp(o|ó)(l|ł) roku\\b" . "6 months")
("\\bkwadrans\\b" . "15 minutes")
("\\bkwarta(l|ł)\\b" . "3 months")
("\\bsekund(y)?\\b" . "seconds")
("\\bza\\ssekund(e|ę)\\b" . "in 1 second")
("\\bza\\sminut(e|ę)\\b" . "in 1 minute")
("\\bminut(e|ę|y)?\\b" . "minutes")
("\\bgodzin(e|ę)\\b" . "1 hour")
("\\bgodziny?\\b" . "hours")
("\\bza\\srok\\b" . "next year")
("\\bdni\\b" . "days")
("\\btygodniu\\b" . "week")
("\\btygodnie\\b" . "weeks")
("\\bmiesi(a|ą)c\\b" . "1 month")
("\\bmiesi(a|ą)c[au]\\b" . "month")
("\\bmiesi(a|ą|ę)c(e|y)\\b" . "months")
("\\brok(u)?\\b" . "year")
("\\blat(a)?\\b" . "years")
("\\bnast(ę|e)pny(m)?\\b" . "next")
("\\bprzysz(ł|l)y(m)?\\b" . "next")
("\\bpoprzedni(m)?\\b" . "last")
("\\bzesz(l|ł)y(m)?\\b" . "last")
("\\bza\\stydzie(n|ń)\\b" . "next week")
("\\bza\\b" . "in")
("\\bponiedzia(ł|l)ek\\b" . "monday")
("\\bwtorek\\b" . "tuesday")
("\\b(ś|s)rod(a|ę|e)\\b" . "wednesday")
("\\bczwartek\\b" . "thursday")
("\\bpi(ą|a)tek\\b" . "friday")
("\\bsobot(a|ę|e)\\b" . "saturday")
("\\niedziel(a|ę|e)\\b" . "sunday")
("\\bza\\schwilk?(e|ę)\\b" . "in 15 seconds")
("\\bp(ó|o)(ź|z)niej\\b" . ,(lambda (time)
(declare (ignore time))
"in 2 hours")) ;TODO adjust timestamp, reformat.
("\\bwe?\\b" . "on")
("\\bo\\b" . "at")))
;;; time from natural language
(defun compute-time-offset-from-string (offset-string &optional (reference-time (local-time:now)))
(labels ((resolve-replacement (replacement)
(typecase replacement
(null "")
(string replacement)
(function (funcall replacement reference-time))
(list (resolve-replacement (random-elt replacement)))
(t "")))
(preprocess-datetime-string (str)
(dolist (rule *timestring-preprocessing-mappings*)
(let ((pattern (car rule))
(replacement (resolve-replacement (cdr rule))))
(setf str (cl-ppcre:regex-replace pattern str replacement))))
str))
;; NOTE ignore-errors, because in rare cases, chronicity:parse can raise a condition.
(ignore-errors (chronicity:parse (preprocess-datetime-string (string-downcase offset-string)) :now reference-time))))