(def %concatenate-to-string character)
(def %concatenate-to-base-string base-char))
\f
-;;;; MAP and MAP-INTO
+;;;; MAP
;;; helper functions to handle arity-1 subcases of MAP
(declaim (ftype (function (function sequence) list) %map-list-arity-1))
first-sequence
more-sequences))
+;;;; MAP-INTO
+
+(defmacro map-into-lambda (sequences params &body body)
+ (check-type sequences symbol)
+ `(flet ((f ,params ,@body))
+ (declare (truly-dynamic-extent #'f))
+ ;; Note (MAP-INTO SEQ (LAMBDA () ...)) is a different animal,
+ ;; hence the awkward flip between MAP and LOOP.
+ (if ,sequences
+ (apply #'map nil #'f ,sequences)
+ (loop (f)))))
+
+(define-array-dispatch vector-map-into (data start end fun sequences)
+ (declare (optimize speed (safety 0))
+ (type index start end)
+ (type function fun)
+ (type list sequences))
+ (let ((index start))
+ (declare (type index index))
+ (if (and sequences (null (rest sequences)))
+ ;; do it manually when there is 1 input sequence
+ (with-array-data ((src (first sequences)) (src-start) (src-end)
+ :check-fill-pointer t)
+ (let ((src-index src-start))
+ (declare (type index src-index))
+ (loop until (or (eql src-index src-end)
+ (eql index end))
+ do (setf (aref data index) (funcall fun (aref src src-index)))
+ (incf index)
+ (incf src-index))))
+ (block mapping
+ (map-into-lambda sequences (&rest args)
+ (declare (truly-dynamic-extent args))
+ (when (eql index end)
+ (return-from mapping))
+ (setf (aref data index) (apply fun args))
+ (incf index))))
+ index))
+
;;; Uses the machinery of (MAP NIL ...). For non-vectors we avoid
;;; computing the length of the result sequence since we can detect
;;; the end during mapping (if MAP even gets that far).
+;;;
+;;; For each result type, define a mapping function which is
+;;; responsible for replacing RESULT-SEQUENCE elements and for
+;;; terminating itself if the end of RESULT-SEQUENCE is reached.
+;;; The mapping function is defined with MAP-INTO-LAMBDA.
+;;;
+;;; MAP-INTO-LAMBDAs are optimized since they are the inner loops.
+;;; Because we are manually doing bounds checking with known types,
+;;; safety is turned off for vectors and lists but kept for generic
+;;; sequences.
(defun map-into (result-sequence function &rest sequences)
- (declare (truly-dynamic-extent sequences))
(let ((really-fun (%coerce-callable-to-fun function)))
- ;; For each result type, define a mapping function which is
- ;; responsible for replacing RESULT-SEQUENCE elements and for
- ;; terminating itself if the end of RESULT-SEQUENCE is reached.
- ;;
- ;; The mapping function is defined with the MAP-LAMBDA macrolet,
- ;; whose syntax matches that of LAMBDA.
- (macrolet ((map-lambda (params &body body)
- `(flet ((f ,params ,@body))
- (declare (truly-dynamic-extent #'f))
- ;; Note (MAP-INTO SEQ (LAMBDA () ...)) is a
- ;; different animal, hence the awkward flip
- ;; between MAP and LOOP.
- (if sequences
- (apply #'map nil #'f sequences)
- (loop (f))))))
- ;; Optimize MAP-LAMBDAs since they are the inner loops. Because
- ;; we are manually doing bounds checking with known types, turn
- ;; off safety for vectors and lists but keep it for generic
- ;; sequences.
- (etypecase result-sequence
- (vector
- (locally (declare (optimize speed (safety 0)))
- (with-array-data ((data result-sequence) (start) (end)
- ;; MAP-INTO ignores fill pointer when mapping
- :check-fill-pointer nil)
- (let ((index start))
- (declare (type index index))
- (macrolet ((dispatch ()
- `(block mapping
- (map-lambda (&rest args)
- (declare (truly-dynamic-extent args))
- (when (eql index end)
- (return-from mapping))
- (setf (aref data index)
- (apply really-fun args))
- (incf index)))))
- (typecase data
- (simple-vector (dispatch))
- (otherwise (dispatch))))
- (when (array-has-fill-pointer-p result-sequence)
- (setf (fill-pointer result-sequence) (- index start)))))))
- (list
- (let ((node result-sequence))
- (declare (type list node))
- (map-lambda (&rest args)
- (declare (truly-dynamic-extent args) (optimize speed (safety 0)))
- (when (null node)
- (return-from map-into result-sequence))
- (setf (car node) (apply really-fun args))
- (setf node (cdr node)))))
- (sequence
- (multiple-value-bind (iter limit from-end)
- (sb!sequence:make-sequence-iterator result-sequence)
- (map-lambda (&rest args)
- (declare (truly-dynamic-extent args) (optimize speed))
- (when (sb!sequence:iterator-endp result-sequence
- iter limit from-end)
- (return-from map-into result-sequence))
- (setf (sb!sequence:iterator-element result-sequence iter)
- (apply really-fun args))
- (setf iter (sb!sequence:iterator-step result-sequence
- iter from-end))))))))
+ (etypecase result-sequence
+ (vector
+ (with-array-data ((data result-sequence) (start) (end)
+ ;; MAP-INTO ignores fill pointer when mapping
+ :check-fill-pointer nil)
+ (let ((new-end (vector-map-into data start end really-fun sequences)))
+ (when (array-has-fill-pointer-p result-sequence)
+ (setf (fill-pointer result-sequence) (- new-end start))))))
+ (list
+ (let ((node result-sequence))
+ (declare (type list node))
+ (map-into-lambda sequences (&rest args)
+ (declare (truly-dynamic-extent args)
+ (optimize speed (safety 0)))
+ (when (null node)
+ (return-from map-into result-sequence))
+ (setf (car node) (apply really-fun args))
+ (setf node (cdr node)))))
+ (sequence
+ (multiple-value-bind (iter limit from-end)
+ (sb!sequence:make-sequence-iterator result-sequence)
+ (map-into-lambda sequences (&rest args)
+ (declare (truly-dynamic-extent args) (optimize speed))
+ (when (sb!sequence:iterator-endp result-sequence
+ iter limit from-end)
+ (return-from map-into result-sequence))
+ (setf (sb!sequence:iterator-element result-sequence iter)
+ (apply really-fun args))
+ (setf iter (sb!sequence:iterator-step result-sequence
+ iter from-end)))))))
result-sequence)
\f
;;;; quantifiers
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