Function: cl-nsubstitute

cl-nsubstitute is an autoloaded and byte-compiled function defined in cl-seq.el.gz.

Signature

(cl-nsubstitute NEW OLD SEQ [KEYWORD VALUE]...)

Documentation

Substitute NEW for OLD in SEQ.

This is a destructive function; it reuses the storage of SEQ whenever possible.

Keywords supported: :test :test-not :key :count :start :end :from-end

Aliases

nsubstitute (obsolete since 27.1)

Source Code

;; Defined in /usr/src/emacs/lisp/emacs-lisp/cl-seq.el.gz
;;;###autoload
(defun cl-nsubstitute (cl-new cl-old cl-seq &rest cl-keys)
  "Substitute NEW for OLD in SEQ.
This is a destructive function; it reuses the storage of SEQ whenever possible.
\nKeywords supported:  :test :test-not :key :count :start :end :from-end
\n(fn NEW OLD SEQ [KEYWORD VALUE]...)"
  (cl--parsing-keywords (:test :test-not :key :if :if-not :count
			(:start 0) :end :from-end) ()
    (let ((len (length cl-seq)))
      (or (eq cl-old cl-new) (<= (or cl-count (setq cl-count len)) 0)
	  (if (and (listp cl-seq) (or (not cl-from-end) (> cl-count (/ len 2))))
	    (let ((cl-p (nthcdr cl-start cl-seq)))
	      (setq cl-end (- (or cl-end len) cl-start))
	      (while (and cl-p (> cl-end 0) (> cl-count 0))
		(if (cl--check-test cl-old (car cl-p))
		    (progn
		      (setcar cl-p cl-new)
		      (setq cl-count (1- cl-count))))
		(setq cl-p (cdr cl-p) cl-end (1- cl-end))))
	    (or cl-end (setq cl-end len))
	  (if cl-from-end
	      (while (and (< cl-start cl-end) (> cl-count 0))
		(setq cl-end (1- cl-end))
		(if (cl--check-test cl-old (elt cl-seq cl-end))
		    (progn
		      (setf (elt cl-seq cl-end) cl-new)
		      (setq cl-count (1- cl-count)))))
	    (while (and (< cl-start cl-end) (> cl-count 0))
	      (if (cl--check-test cl-old (aref cl-seq cl-start))
		  (progn
		    (aset cl-seq cl-start cl-new)
		    (setq cl-count (1- cl-count))))
	      (setq cl-start (1+ cl-start)))))))
    cl-seq))