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-rw-r--r--lib.functions.lisp56
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-;;; lib.functions.lisp - 2025-02-09
-
-;; Copyright (C) 2025 Aryadev Chavali
-
-;; This program is distributed in the hope that it will be useful, but WITHOUT
-;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
-;; FOR A PARTICULAR PURPOSE. See the GNU General Public License Version 2 for
-;; details.
-
-;; You may distribute and modify this code under the terms of the GNU General
-;; Public License Version 2, which you should have received a copy of along with
-;; this program. If not, please go to <https://www.gnu.org/licenses/>.
-
-;;; Commentary:
-
-;; Helpful functions for usage throughout the project.
-
-;;; Code:
-
-(in-package :cantedraw.lib.functions)
-
-(fn range (start end &optional (step 1)) (-> (fixnum fixnum &optional fixnum) list)
- "Make a list of numbers from START to END (exclusive). If STEP is given, then
-each member is STEP distance apart."
- (if (<= end start)
- (error (format nil "~a < ~a" end start))
- (loop :for i :from start :to (1- end) :by step
- :collect i)))
-
-(fn take (n lst) (-> (fixnum list) list)
- "Return the first N elements of LST."
- (subseq lst 0 n))
-
-(fn split (n lst) (-> (fixnum list) list)
- "Return CONS where CAR is the first N elements of LST and CDR is the rest."
- (cons (take n lst)
- (subseq lst n)))
-
-(fn rev-map (indicator lst &key (key-eq #'eq))
- (-> (function list &key (:key-eq function)) list)
- "Given LST and INDICATOR: LST -> A, return an association list A -> 2^LST
-where key x in A has associations {y in LST : INDICATOR(y) = x}."
- (loop :with assoc-list := nil
- :for element :in lst
- :for key := (funcall indicator element)
- :if (assoc key assoc-list :test key-eq)
- :do (->> (alist-val key assoc-list)
- (cons element)
- (setf (alist-val key assoc-list)))
- :else
- :do (setq assoc-list (cons (list key element) assoc-list))
- :finally (return assoc-list)))
-
-(fn parse-integer* (inp) (-> (string) (or integer list))
- "Given string INP, attempt to parse an integer. Return NIL otherwise."
- (parse-integer inp :junk-allowed t))