  Copyright ( c ) 2011 - 2012 ,    . All rights reserved .
;;;
;;; Redistribution and use in source and binary forms, with or without
;;; modification, are permitted provided that the following conditions
;;; are met:
;;;
;;;     * Redistributions of source code must retain the above copyright
;;;       notice, this list of conditions and the following disclaimer.
;;;
;;;     * Redistributions in binary form must reproduce the above
;;;       copyright notice, this list of conditions and the following
;;;       disclaimer in the documentation and/or other materials provided
;;;       with the distribution.
;;;
;;;     * Neither the name of the project nor the names of its
;;;       contributors may be used to endorse or promote products derived
;;;       from this software without specific prior written permission.
;;;
;;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  " AS IS " AND ANY EXPRESS OR IMPLIED WARRANTIES , INCLUDING , BUT NOT
;;; LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
;;; A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  HOLDER OR    FOR ANY DIRECT , INDIRECT , INCIDENTAL ,
  SPECIAL , EXEMPLARY , OR CONSEQUENTIAL DAMAGES ( INCLUDING , BUT NOT
  LIMITED TO , PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES ; LOSS OF USE ,
;;; DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  THEORY OF LIABILITY , WHETHER IN CONTRACT , STRICT LIABILITY , OR TORT
;;; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
;;; OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

(in-package #:lparallel.cognate)

(defun premove-if-not/list (test list from-end start end key parts)
  (let* ((size (length list))
         (subsize (subsize list size start end)))
    (if (zerop subsize)
        nil
        (let ((test (ensure-function test))
              (leading (subseq list 0 start))
              (trailing (if (or (null end)
                                (eql subsize (- size start)))
                            nil
                            (copy-list (nthcdr end list)))))
          (nconc leading
                 (reduce #'nreconc
                         (preduce/common (lambda (acc x)
                                           (declare #.*normal-optimize*)
                                           (if (funcall test x)
                                               (cons x acc)
                                               acc))
                                         (nthcdr start list)
                                         subsize
                                         :initial-value nil
                                         :key key
                                         :parts parts
                                         :from-end from-end
                                         :partial t)
                         :initial-value trailing
                         :from-end t))))))

(defun premove-if-not (test sequence
                       &rest args
                       &key from-end (start 0) end key parts)
  "Parallel version of `remove-if-not'. Note the `count' option is not
supported.

The `parts' option divides `sequence' into `parts' number of parts.
Default is (kernel-worker-count)."
  (declare (dynamic-extent args))
  (typecase sequence
    (list      (premove-if-not/list test sequence
                                    from-end start end key parts))
    (otherwise (apply #'remove-if-not test sequence args))))

(defun premove-if (test sequence
                   &rest args
                   &key from-end (start 0) end key parts)
  "Parallel version of `remove-if'. Note the `count' option is not
supported.

The `parts' option divides `sequence' into `parts' number of parts.
Default is (kernel-worker-count)."
  (declare (dynamic-extent args))
  (typecase sequence
    (list (premove-if-not/list (complement (ensure-function test)) sequence
                               from-end start end key parts))
    (otherwise (apply #'remove-if test sequence
                      (remove-from-plist args :parts)))))

(defun premove (item sequence
                &rest args
                &key test test-not from-end (start 0) end key parts)
  "Parallel version of `remove'. Note the `count' option is not
supported.

The `parts' option divides `sequence' into `parts' number of parts.
Default is (kernel-worker-count)."
  (declare (dynamic-extent args))
  (typecase sequence
    (list (premove-if-not/list (complement (item-predicate item test test-not))
                               sequence
                               from-end start end key parts))
    (otherwise (apply #'remove item sequence
                      (remove-from-plist args :parts)))))


 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions
 are met:

     * Redistributions of source code must retain the above copyright
       notice, this list of conditions and the following disclaimer.

     * Redistributions in binary form must reproduce the above
       copyright notice, this list of conditions and the following
       disclaimer in the documentation and/or other materials provided
       with the distribution.

     * Neither the name of the project nor the names of its
       contributors may be used to endorse or promote products derived
       from this software without specific prior written permission.

 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 LOSS OF USE ,
 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  Copyright ( c ) 2011 - 2012 ,    . All rights reserved .
  " AS IS " AND ANY EXPRESS OR IMPLIED WARRANTIES , INCLUDING , BUT NOT
  HOLDER OR    FOR ANY DIRECT , INDIRECT , INCIDENTAL ,
  SPECIAL , EXEMPLARY , OR CONSEQUENTIAL DAMAGES ( INCLUDING , BUT NOT
  THEORY OF LIABILITY , WHETHER IN CONTRACT , STRICT LIABILITY , OR TORT

(in-package #:lparallel.cognate)

(defun premove-if-not/list (test list from-end start end key parts)
  (let* ((size (length list))
         (subsize (subsize list size start end)))
    (if (zerop subsize)
        nil
        (let ((test (ensure-function test))
              (leading (subseq list 0 start))
              (trailing (if (or (null end)
                                (eql subsize (- size start)))
                            nil
                            (copy-list (nthcdr end list)))))
          (nconc leading
                 (reduce #'nreconc
                         (preduce/common (lambda (acc x)
                                           (declare #.*normal-optimize*)
                                           (if (funcall test x)
                                               (cons x acc)
                                               acc))
                                         (nthcdr start list)
                                         subsize
                                         :initial-value nil
                                         :key key
                                         :parts parts
                                         :from-end from-end
                                         :partial t)
                         :initial-value trailing
                         :from-end t))))))

(defun premove-if-not (test sequence
                       &rest args
                       &key from-end (start 0) end key parts)
  "Parallel version of `remove-if-not'. Note the `count' option is not
supported.

The `parts' option divides `sequence' into `parts' number of parts.
Default is (kernel-worker-count)."
  (declare (dynamic-extent args))
  (typecase sequence
    (list      (premove-if-not/list test sequence
                                    from-end start end key parts))
    (otherwise (apply #'remove-if-not test sequence args))))

(defun premove-if (test sequence
                   &rest args
                   &key from-end (start 0) end key parts)
  "Parallel version of `remove-if'. Note the `count' option is not
supported.

The `parts' option divides `sequence' into `parts' number of parts.
Default is (kernel-worker-count)."
  (declare (dynamic-extent args))
  (typecase sequence
    (list (premove-if-not/list (complement (ensure-function test)) sequence
                               from-end start end key parts))
    (otherwise (apply #'remove-if test sequence
                      (remove-from-plist args :parts)))))

(defun premove (item sequence
                &rest args
                &key test test-not from-end (start 0) end key parts)
  "Parallel version of `remove'. Note the `count' option is not
supported.

The `parts' option divides `sequence' into `parts' number of parts.
Default is (kernel-worker-count)."
  (declare (dynamic-extent args))
  (typecase sequence
    (list (premove-if-not/list (complement (item-predicate item test test-not))
                               sequence
                               from-end start end key parts))
    (otherwise (apply #'remove item sequence
                      (remove-from-plist args :parts)))))
