1;;;Extensible Sequences for ABCL based on the SBCL API 2 3(in-package :sequence) 4 5(require "CLOS") 6(require "EXTENSIBLE-SEQUENCES-BASE") 7(require "LOOP") 8 9#|| 10We specify generic functions length, elt and (setf elt) 11to correspond to the Common Lisp functions with the same 12name. In each case, there are two primary methods with the 13sequence argument specialized on list and on vector, pro- 14viding the standard-defined behaviour for the Common Lisp 15operator, and a third method with the sequence argument 16specialized on sequence, which signals an error of type type- 17error, for compatibility with the standard requirement of 18the sequence argument to be a proper sequence. 19||# 20 21(fmakunbound 'length) 22(defgeneric length (sequence) 23 (:documentation "Extension point for user-defined sequences. Invoked by cl:length.")) 24 25(defmethod length ((sequence sequence)) 26 (error 'type-error :datum sequence :expected-type 'proper-sequence)) 27 28(defmethod length ((sequence vector)) 29 (sys::%length sequence)) 30 31(defmethod length ((sequence list)) 32 (sys::%length sequence)) 33 34(defmethod length (sequence) 35 (error 'type-error :datum sequence :expected-type 'sequence)) 36 37(defun cl:length (sequence) 38 (seq-dispatch sequence 39 (sys::%length sequence) 40 (sys::%length sequence) 41 (length sequence))) 42 43(defgeneric elt (sequence index)) 44 45(defmethod elt ((sequence vector) index) 46 (sys::%elt sequence index)) 47 48(defmethod elt ((sequence list) index) 49 (sys::%elt sequence index)) 50 51(defmethod elt ((sequence sequence) index) 52 (declare (ignore index)) 53 (error 'type-error :datum sequence :expected-type 'proper-sequence)) 54 55(defmethod elt (sequence index) 56 (declare (ignore index)) 57 (error 'type-error :datum sequence :expected-type 'sequence)) 58 59(defun cl:elt (sequence index) 60 (seq-dispatch sequence 61 (sys::%elt sequence index) 62 (sys::%elt sequence index) 63 (elt sequence index))) 64 65(defgeneric (setf elt) (value sequence index)) 66 67(defmethod (setf elt) (value (sequence vector) index) 68 (sys::%set-elt sequence index value)) 69 70(defmethod (setf elt) (value (sequence list) index) 71 (sys::%set-elt sequence index value)) 72 73(defmethod (setf elt) (value (sequence sequence) index) 74 (declare (ignore index value)) 75 (error 'type-error :datum sequence :expected-type 'proper-sequence)) 76 77(defmethod (setf elt) (value sequence index) 78 (declare (ignore index value)) 79 (error 'type-error :datum sequence :expected-type 'sequence)) 80 81(defun cl:subseq (sequence start &optional end) 82 "Return a copy of a subsequence of SEQUENCE starting with element number 83 START and continuing to the end of SEQUENCE or the optional END." 84 (seq-dispatch sequence 85 (sys::%subseq sequence start end) 86 (sys::%subseq sequence start end) 87 (sequence:subseq sequence start end))) 88 89(defun cl:reverse (sequence) 90 (seq-dispatch sequence 91 (sys::%reverse sequence) 92 (sys::%reverse sequence) 93 (sequence:reverse sequence))) 94 95(defun cl:nreverse (sequence) 96 (seq-dispatch sequence 97 (sys::%nreverse sequence) 98 (sys::%nreverse sequence) 99 (sequence:nreverse sequence))) 100 101;;;Adapted from SBCL 102(define-condition sequence::protocol-unimplemented (type-error) 103 ()) 104 105(defun sequence::protocol-unimplemented (sequence) 106 (error 'sequence::protocol-unimplemented 107 :datum sequence :expected-type '(or list vector))) 108 109(defgeneric sequence:make-sequence-like 110 (sequence length &key initial-element initial-contents) 111 (:method ((s list) length &key 112 (initial-element nil iep) (initial-contents nil icp)) 113 (cond 114 ((and icp iep) (error "Can't specify both :initial-element and :initial-contents")) 115 (iep (make-list length :initial-element initial-element)) 116 (icp (unless (= (length initial-contents) length) 117 (error "initial-contents is of length ~S but should be of the same length of the input sequence (~S)" (length initial-contents) length)) 118 (let ((result (make-list length))) 119 (replace result initial-contents) 120 result)) 121 (t (make-list length)))) 122 (:method ((s vector) length &key 123 (initial-element nil iep) (initial-contents nil icp)) 124 (cond 125 ((and icp iep) (error "Can't specify both :initial-element and :initial-contents")) 126 (iep (make-array length :element-type (array-element-type s) 127 :initial-element initial-element)) 128 (icp (make-array length :element-type (array-element-type s) 129 :initial-contents initial-contents)) 130 (t (make-array length :element-type (array-element-type s))))) 131 (:method ((s sequence) length &key initial-element initial-contents) 132 (declare (ignore initial-element initial-contents)) 133 (sequence::protocol-unimplemented s))) 134 135(defgeneric sequence:adjust-sequence 136 (sequence length &key initial-element initial-contents) 137 (:method ((s list) length &key initial-element (initial-contents nil icp)) 138 (if (eql length 0) 139 nil 140 (let ((olength (length s))) 141 (cond 142 ((eql length olength) (if icp (replace s initial-contents) s)) 143 ((< length olength) 144 (rplacd (nthcdr (1- length) s) nil) 145 (if icp (replace s initial-contents) s)) 146 ((null s) 147 (let ((return (make-list length :initial-element initial-element))) 148 (if icp (replace return initial-contents) return))) 149 (t (rplacd (nthcdr (1- olength) s) 150 (make-list (- length olength) 151 :initial-element initial-element)) 152 (if icp (replace s initial-contents) s)))))) 153 (:method ((s vector) length &rest args &key (initial-contents nil icp) initial-element) 154 (declare (ignore initial-element)) 155 (cond 156 ((and (array-has-fill-pointer-p s) 157 (>= (array-total-size s) length)) 158 (setf (fill-pointer s) length) 159 (if icp (replace s initial-contents) s)) 160 ((eql (length s) length) 161 (if icp (replace s initial-contents) s)) 162 (t (apply #'adjust-array s length args)))) 163 (:method (new-value (s sequence) &rest args) 164 (declare (ignore args)) 165 (sequence::protocol-unimplemented s))) 166 167;;;; iterator protocol 168 169;;; The general protocol 170 171(defgeneric sequence:make-sequence-iterator (sequence &key from-end start end) 172 (:method ((s sequence) &key from-end (start 0) end) 173 (multiple-value-bind (iterator limit from-end) 174 (sequence:make-simple-sequence-iterator 175 s :from-end from-end :start start :end end) 176 (values iterator limit from-end 177 #'sequence:iterator-step #'sequence:iterator-endp 178 #'sequence:iterator-element #'(setf sequence:iterator-element) 179 #'sequence:iterator-index #'sequence:iterator-copy))) 180 (:method ((s t) &key from-end start end) 181 (declare (ignore from-end start end)) 182 (error 'type-error 183 :datum s 184 :expected-type 'sequence))) 185 186;;; the simple protocol: the simple iterator returns three values, 187;;; STATE, LIMIT and FROM-END. 188 189;;; magic termination value for list :from-end t 190(defvar *exhausted* (cons nil nil)) 191 192(defgeneric sequence:make-simple-sequence-iterator 193 (sequence &key from-end start end) 194 (:method ((s list) &key from-end (start 0) end) 195 (if from-end 196 (let* ((termination (if (= start 0) *exhausted* (nthcdr (1- start) s))) 197 (init (if (<= (or end (length s)) start) 198 termination 199 (if end (last s (- (length s) (1- end))) (last s))))) 200 (values init termination t)) 201 (cond 202 ((not end) (values (nthcdr start s) nil nil)) 203 (t (let ((st (nthcdr start s))) 204 (values st (nthcdr (- end start) st) nil)))))) 205 (:method ((s vector) &key from-end (start 0) end) 206 (let ((end (or end (length s)))) 207 (if from-end 208 (values (1- end) (1- start) t) 209 (values start end nil)))) 210 (:method ((s sequence) &key from-end (start 0) end) 211 (let ((end (or end (length s)))) 212 (if from-end 213 (values (1- end) (1- start) from-end) 214 (values start end nil))))) 215 216(defgeneric sequence:iterator-step (sequence iterator from-end) 217 (:method ((s list) iterator from-end) 218 (if from-end 219 (if (eq iterator s) 220 *exhausted* 221 (do* ((xs s (cdr xs))) 222 ((eq (cdr xs) iterator) xs))) 223 (cdr iterator))) 224 (:method ((s vector) iterator from-end) 225 (if from-end 226 (1- iterator) 227 (1+ iterator))) 228 (:method ((s sequence) iterator from-end) 229 (if from-end 230 (1- iterator) 231 (1+ iterator)))) 232 233(defgeneric sequence:iterator-endp (sequence iterator limit from-end) 234 (:method ((s list) iterator limit from-end) 235 (eq iterator limit)) 236 (:method ((s vector) iterator limit from-end) 237 (= iterator limit)) 238 (:method ((s sequence) iterator limit from-end) 239 (= iterator limit))) 240 241(defgeneric sequence:iterator-element (sequence iterator) 242 (:method ((s list) iterator) 243 (car iterator)) 244 (:method ((s vector) iterator) 245 (aref s iterator)) 246 (:method ((s sequence) iterator) 247 (elt s iterator))) 248 249(defgeneric (setf sequence:iterator-element) (new-value sequence iterator) 250 (:method (o (s list) iterator) 251 (setf (car iterator) o)) 252 (:method (o (s vector) iterator) 253 (setf (aref s iterator) o)) 254 (:method (o (s sequence) iterator) 255 (setf (elt s iterator) o))) 256 257(defgeneric sequence:iterator-index (sequence iterator) 258 (:method ((s list) iterator) 259 ;; FIXME: this sucks. (In my defence, it is the equivalent of the 260 ;; Apple implementation in Dylan...) 261 (loop for l on s for i from 0 when (eq l iterator) return i)) 262 (:method ((s vector) iterator) iterator) 263 (:method ((s sequence) iterator) iterator)) 264 265(defgeneric sequence:iterator-copy (sequence iterator) 266 (:method ((s list) iterator) iterator) 267 (:method ((s vector) iterator) iterator) 268 (:method ((s sequence) iterator) iterator)) 269 270(defmacro sequence:with-sequence-iterator 271 ((&rest vars) (s &rest args &key from-end start end) &body body) 272 (declare (ignore from-end start end)) 273 `(multiple-value-bind (,@vars) (sequence:make-sequence-iterator ,s ,@args) 274 (declare (type function ,@(nthcdr 3 vars))) 275 ,@body)) 276 277(defmacro sequence:with-sequence-iterator-functions 278 ((step endp elt setf index copy) 279 (s &rest args &key from-end start end) 280 &body body) 281 (declare (ignore from-end start end)) 282 (let ((nstate (gensym "STATE")) (nlimit (gensym "LIMIT")) 283 (nfrom-end (gensym "FROM-END-")) (nstep (gensym "STEP")) 284 (nendp (gensym "ENDP")) (nelt (gensym "ELT")) 285 (nsetf (gensym "SETF")) (nindex (gensym "INDEX")) 286 (ncopy (gensym "COPY"))) 287 `(sequence:with-sequence-iterator 288 (,nstate ,nlimit ,nfrom-end ,nstep ,nendp ,nelt ,nsetf ,nindex ,ncopy) 289 (,s ,@args) 290 (flet ((,step () (setq ,nstate (funcall ,nstep ,s ,nstate ,nfrom-end))) 291 (,endp () (funcall ,nendp ,s ,nstate ,nlimit ,nfrom-end)) 292 (,elt () (funcall ,nelt ,s ,nstate)) 293 (,setf (new-value) (funcall ,nsetf new-value ,s ,nstate)) 294 (,index () (funcall ,nindex ,s ,nstate)) 295 (,copy () (funcall ,ncopy ,s ,nstate))) 296 (declare (truly-dynamic-extent #',step #',endp #',elt 297 #',setf #',index #',copy)) 298 ,@body)))) 299 300(defun sequence:canonize-test (test test-not) 301 (cond 302 (test (if (functionp test) test (fdefinition test))) 303 (test-not (if (functionp test-not) 304 (complement test-not) 305 (complement (fdefinition test-not)))) 306 (t #'eql))) 307 308(defun sequence:canonize-key (key) 309 (or (and key (if (functionp key) key (fdefinition key))) #'identity)) 310 311;;;; generic implementations for sequence functions. 312 313;;; FIXME: COUNT, POSITION and FIND share an awful lot of structure. 314;;; They could usefully be defined in an OAOO way. 315(defgeneric sequence:count 316 (item sequence &key from-end start end test test-not key) 317 (:argument-precedence-order sequence item)) 318(defmethod sequence:count 319 (item (sequence sequence) &key from-end (start 0) end test test-not key) 320 (let ((test (sequence:canonize-test test test-not)) 321 (key (sequence:canonize-key key))) 322 (sequence:with-sequence-iterator (state limit from-end step endp elt) 323 (sequence :from-end from-end :start start :end end) 324 (do ((count 0)) 325 ((funcall endp sequence state limit from-end) count) 326 (let ((o (funcall elt sequence state))) 327 (when (funcall test item (funcall key o)) 328 (incf count)) 329 (setq state (funcall step sequence state from-end))))))) 330 331(defgeneric sequence:count-if (pred sequence &key from-end start end key) 332 (:argument-precedence-order sequence pred)) 333(defmethod sequence:count-if 334 (pred (sequence sequence) &key from-end (start 0) end key) 335 (let ((key (sequence:canonize-key key))) 336 (sequence:with-sequence-iterator (state limit from-end step endp elt) 337 (sequence :from-end from-end :start start :end end) 338 (do ((count 0)) 339 ((funcall endp sequence state limit from-end) count) 340 (let ((o (funcall elt sequence state))) 341 (when (funcall pred (funcall key o)) 342 (incf count)) 343 (setq state (funcall step sequence state from-end))))))) 344 345(defgeneric sequence:count-if-not (pred sequence &key from-end start end key) 346 (:argument-precedence-order sequence pred)) 347(defmethod sequence:count-if-not 348 (pred (sequence sequence) &key from-end (start 0) end key) 349 (let ((key (sequence:canonize-key key))) 350 (sequence:with-sequence-iterator (state limit from-end step endp elt) 351 (sequence :from-end from-end :start start :end end) 352 (do ((count 0)) 353 ((funcall endp sequence state limit from-end) count) 354 (let ((o (funcall elt sequence state))) 355 (unless (funcall pred (funcall key o)) 356 (incf count)) 357 (setq state (funcall step sequence state from-end))))))) 358 359(defgeneric sequence:find 360 (item sequence &key from-end start end test test-not key) 361 (:argument-precedence-order sequence item)) 362(defmethod sequence:find 363 (item (sequence sequence) &key from-end (start 0) end test test-not key) 364 (let ((test (sequence:canonize-test test test-not)) 365 (key (sequence:canonize-key key))) 366 (sequence:with-sequence-iterator (state limit from-end step endp elt) 367 (sequence :from-end from-end :start start :end end) 368 (do () 369 ((funcall endp sequence state limit from-end) nil) 370 (let ((o (funcall elt sequence state))) 371 (when (funcall test item (funcall key o)) 372 (return o)) 373 (setq state (funcall step sequence state from-end))))))) 374 375(defgeneric sequence:find-if (pred sequence &key from-end start end key) 376 (:argument-precedence-order sequence pred)) 377(defmethod sequence:find-if 378 (pred (sequence sequence) &key from-end (start 0) end key) 379 (let ((key (sequence:canonize-key key))) 380 (sequence:with-sequence-iterator (state limit from-end step endp elt) 381 (sequence :from-end from-end :start start :end end) 382 (do () 383 ((funcall endp sequence state limit from-end) nil) 384 (let ((o (funcall elt sequence state))) 385 (when (funcall pred (funcall key o)) 386 (return o)) 387 (setq state (funcall step sequence state from-end))))))) 388 389(defgeneric sequence:find-if-not (pred sequence &key from-end start end key) 390 (:argument-precedence-order sequence pred)) 391(defmethod sequence:find-if-not 392 (pred (sequence sequence) &key from-end (start 0) end key) 393 (let ((key (sequence:canonize-key key))) 394 (sequence:with-sequence-iterator (state limit from-end step endp elt) 395 (sequence :from-end from-end :start start :end end) 396 (do () 397 ((funcall endp sequence state limit from-end) nil) 398 (let ((o (funcall elt sequence state))) 399 (unless (funcall pred (funcall key o)) 400 (return o)) 401 (setq state (funcall step sequence state from-end))))))) 402 403(defgeneric sequence:position 404 (item sequence &key from-end start end test test-not key) 405 (:argument-precedence-order sequence item)) 406(defmethod sequence:position 407 (item (sequence sequence) &key from-end (start 0) end test test-not key) 408 (let ((test (sequence:canonize-test test test-not)) 409 (key (sequence:canonize-key key))) 410 (sequence:with-sequence-iterator (state limit from-end step endp elt) 411 (sequence :from-end from-end :start start :end end) 412 (do ((s (if from-end -1 1)) 413 (pos (if from-end (1- (or end (length sequence))) start) (+ pos s))) 414 ((funcall endp sequence state limit from-end) nil) 415 (let ((o (funcall elt sequence state))) 416 (when (funcall test item (funcall key o)) 417 (return pos)) 418 (setq state (funcall step sequence state from-end))))))) 419 420(defgeneric sequence:position-if (pred sequence &key from-end start end key) 421 (:argument-precedence-order sequence pred)) 422(defmethod sequence:position-if 423 (pred (sequence sequence) &key from-end (start 0) end key) 424 (let ((key (sequence:canonize-key key))) 425 (sequence:with-sequence-iterator (state limit from-end step endp elt) 426 (sequence :from-end from-end :start start :end end) 427 (do ((s (if from-end -1 1)) 428 (pos (if from-end (1- (or end (length sequence))) start) (+ pos s))) 429 ((funcall endp sequence state limit from-end) nil) 430 (let ((o (funcall elt sequence state))) 431 (when (funcall pred (funcall key o)) 432 (return pos)) 433 (setq state (funcall step sequence state from-end))))))) 434 435(defgeneric sequence:position-if-not 436 (pred sequence &key from-end start end key) 437 (:argument-precedence-order sequence pred)) 438(defmethod sequence:position-if-not 439 (pred (sequence sequence) &key from-end (start 0) end key) 440 (let ((key (sequence:canonize-key key))) 441 (sequence:with-sequence-iterator (state limit from-end step endp elt) 442 (sequence :from-end from-end :start start :end end) 443 (do ((s (if from-end -1 1)) 444 (pos (if from-end (1- (or end (length sequence))) start) (+ pos s))) 445 ((funcall endp sequence state limit from-end) nil) 446 (let ((o (funcall elt sequence state))) 447 (unless (funcall pred (funcall key o)) 448 (return pos)) 449 (setq state (funcall step sequence state from-end))))))) 450 451(defgeneric sequence:subseq (sequence start &optional end)) 452(defmethod sequence:subseq ((sequence sequence) start &optional end) 453 (let* ((end (or end (length sequence))) 454 (length (- end start)) 455 (result (sequence:make-sequence-like sequence length))) 456 (sequence:with-sequence-iterator (state limit from-end step endp elt) 457 (sequence :start start :end end) 458 (declare (ignore limit endp)) 459 (sequence:with-sequence-iterator (rstate rlimit rfrom-end rstep rendp relt rsetelt) 460 (result) 461 (declare (ignore rlimit rendp relt)) 462 (do ((i 0 (+ i 1))) 463 ((>= i length) result) 464 (funcall rsetelt (funcall elt sequence state) result rstate) 465 (setq state (funcall step sequence state from-end)) 466 (setq rstate (funcall rstep result rstate rfrom-end))))))) 467 468(defgeneric sequence:copy-seq (sequence)) 469(defmethod sequence:copy-seq ((sequence sequence)) 470 (sequence:subseq sequence 0)) 471 472(fmakunbound 'sequence:fill) 473(defgeneric sequence:fill (sequence item &key start end)) 474(defmethod sequence:fill ((sequence sequence) item &key (start 0) end) 475 (sequence:with-sequence-iterator (state limit from-end step endp elt setelt) 476 (sequence :start start :end end) 477 (declare (ignore elt)) 478 (do () 479 ((funcall endp sequence state limit from-end) sequence) 480 (funcall setelt item sequence state) 481 (setq state (funcall step sequence state from-end))))) 482 483(defgeneric sequence:nsubstitute 484 (new old sequence &key start end from-end test test-not count key) 485 (:argument-precedence-order sequence new old)) 486(defmethod sequence:nsubstitute (new old (sequence sequence) &key (start 0) 487 end from-end test test-not count key) 488 (let ((test (sequence:canonize-test test test-not)) 489 (key (sequence:canonize-key key))) 490 (sequence:with-sequence-iterator (state limit from-end step endp elt setelt) 491 (sequence :start start :end end :from-end from-end) 492 (do ((c 0)) 493 ((or (and count (>= c count)) 494 (funcall endp sequence state limit from-end)) 495 sequence) 496 (when (funcall test old (funcall key (funcall elt sequence state))) 497 (incf c) 498 (funcall setelt new sequence state)) 499 (setq state (funcall step sequence state from-end)))))) 500 501(defgeneric sequence:nsubstitute-if 502 (new predicate sequence &key start end from-end count key) 503 (:argument-precedence-order sequence new predicate)) 504(defmethod sequence:nsubstitute-if 505 (new predicate (sequence sequence) &key (start 0) end from-end count key) 506 (let ((key (sequence:canonize-key key))) 507 (sequence:with-sequence-iterator (state limit from-end step endp elt setelt) 508 (sequence :start start :end end :from-end from-end) 509 (do ((c 0)) 510 ((or (and count (>= c count)) 511 (funcall endp sequence state limit from-end)) 512 sequence) 513 (when (funcall predicate (funcall key (funcall elt sequence state))) 514 (incf c) 515 (funcall setelt new sequence state)) 516 (setq state (funcall step sequence state from-end)))))) 517 518(defgeneric sequence:nsubstitute-if-not 519 (new predicate sequence &key start end from-end count key) 520 (:argument-precedence-order sequence new predicate)) 521(defmethod sequence:nsubstitute-if-not 522 (new predicate (sequence sequence) &key (start 0) end from-end count key) 523 (let ((key (sequence:canonize-key key))) 524 (sequence:with-sequence-iterator (state limit from-end step endp elt setelt) 525 (sequence :start start :end end :from-end from-end) 526 (do ((c 0)) 527 ((or (and count (>= c count)) 528 (funcall endp sequence state limit from-end)) 529 sequence) 530 (unless (funcall predicate (funcall key (funcall elt sequence state))) 531 (incf c) 532 (funcall setelt new sequence state)) 533 (setq state (funcall step sequence state from-end)))))) 534 535(defgeneric sequence:substitute 536 (new old sequence &key start end from-end test test-not count key) 537 (:argument-precedence-order sequence new old)) 538(defmethod sequence:substitute (new old (sequence sequence) &rest args &key 539 (start 0) end from-end test test-not count key) 540 (declare (truly-dynamic-extent args)) 541 (declare (ignore start end from-end test test-not count key)) 542 (let ((result (copy-seq sequence))) 543 (apply #'sequence:nsubstitute new old result args))) 544 545(defgeneric sequence:substitute-if 546 (new predicate sequence &key start end from-end count key) 547 (:argument-precedence-order sequence new predicate)) 548(defmethod sequence:substitute-if (new predicate (sequence sequence) &rest args 549 &key (start 0) end from-end count key) 550 (declare (truly-dynamic-extent args)) 551 (declare (ignore start end from-end count key)) 552 (let ((result (copy-seq sequence))) 553 (apply #'sequence:nsubstitute-if new predicate result args))) 554 555(defgeneric sequence:substitute-if-not 556 (new predicate sequence &key start end from-end count key) 557 (:argument-precedence-order sequence new predicate)) 558(defmethod sequence:substitute-if-not 559 (new predicate (sequence sequence) &rest args &key 560 (start 0) end from-end count key) 561 (declare (truly-dynamic-extent args)) 562 (declare (ignore start end from-end count key)) 563 (let ((result (copy-seq sequence))) 564 (apply #'sequence:nsubstitute-if-not new predicate result args))) 565 566(defun %sequence-replace (sequence1 sequence2 start1 end1 start2 end2) 567 (sequence:with-sequence-iterator (state1 limit1 from-end1 step1 endp1 elt1 setelt1) 568 (sequence1 :start start1 :end end1) 569 (declare (ignore elt1)) 570 (sequence:with-sequence-iterator (state2 limit2 from-end2 step2 endp2 elt2) 571 (sequence2 :start start2 :end end2) 572 (do () 573 ((or (funcall endp1 sequence1 state1 limit1 from-end1) 574 (funcall endp2 sequence2 state2 limit2 from-end2)) 575 sequence1) 576 (funcall setelt1 (funcall elt2 sequence2 state2) sequence1 state1) 577 (setq state1 (funcall step1 sequence1 state1 from-end1)) 578 (setq state2 (funcall step2 sequence2 state2 from-end2)))))) 579 580(defgeneric sequence:replace 581 (sequence1 sequence2 &key start1 end1 start2 end2) 582 (:argument-precedence-order sequence2 sequence1)) 583(defmethod sequence:replace 584 ((sequence1 sequence) (sequence2 sequence) &key 585 (start1 0) end1 (start2 0) end2) 586 (print sequence1) 587 (print sequence2) 588 (cond 589 ((eq sequence1 sequence2) 590 (let ((replaces (subseq sequence2 start2 end2))) 591 (%sequence-replace sequence1 replaces start1 end1 0 nil))) 592 (t (%sequence-replace sequence1 sequence2 start1 end1 start2 end2)))) 593 594(defgeneric sequence:nreverse (sequence)) 595(defmethod sequence:nreverse ((sequence sequence)) 596 ;; FIXME: this, in particular the :from-end iterator, will suck 597 ;; mightily if the user defines a list-like structure. 598 (let ((length (length sequence))) 599 (sequence:with-sequence-iterator (state1 limit1 from-end1 step1 endp1 elt1 setelt1) 600 (sequence :end (floor length 2)) 601 (sequence:with-sequence-iterator (state2 limit2 from-end2 step2 endp2 elt2 setelt2) 602 (sequence :start (ceiling length 2) :from-end t) 603 (declare (ignore limit2 endp2)) 604 (do () 605 ((funcall endp1 sequence state1 limit1 from-end1) sequence) 606 (let ((x (funcall elt1 sequence state1)) 607 (y (funcall elt2 sequence state2))) 608 (funcall setelt1 y sequence state1) 609 (funcall setelt2 x sequence state2)) 610 (setq state1 (funcall step1 sequence state1 from-end1)) 611 (setq state2 (funcall step2 sequence state2 from-end2))))))) 612 613(defgeneric sequence:reverse (sequence)) 614(defmethod sequence:reverse ((sequence sequence)) 615 (let ((result (copy-seq sequence))) 616 (sequence:nreverse result))) 617 618(defgeneric sequence:reduce 619 (function sequence &key from-end start end initial-value) 620 (:argument-precedence-order sequence function)) 621(defmethod sequence:reduce 622 (function (sequence sequence) &key from-end (start 0) end key 623 (initial-value nil ivp)) 624 (let ((key (sequence:canonize-key key))) 625 (sequence:with-sequence-iterator (state limit from-end step endp elt) 626 (sequence :start start :end end :from-end from-end) 627 (if (funcall endp sequence state limit from-end) 628 (if ivp initial-value (funcall function)) 629 (do* ((state state (funcall step sequence state from-end)) 630 (value (cond 631 (ivp initial-value) 632 (t (prog1 633 (funcall key (funcall elt sequence state)) 634 (setq state (funcall step sequence state from-end))))))) 635 ((funcall endp sequence state limit from-end) value) 636 (let ((e (funcall key (funcall elt sequence state)))) 637 (if from-end 638 (setq value (funcall function e value)) 639 (setq value (funcall function value e))))))))) 640 641(defgeneric sequence:mismatch (sequence1 sequence2 &key from-end start1 end1 642 start2 end2 test test-not key)) 643(defmethod sequence:mismatch 644 ((sequence1 sequence) (sequence2 sequence) &key from-end (start1 0) end1 645 (start2 0) end2 test test-not key) 646 (let ((test (sequence:canonize-test test test-not)) 647 (key (sequence:canonize-key key))) 648 (sequence:with-sequence-iterator (state1 limit1 from-end1 step1 endp1 elt1) 649 (sequence1 :start start1 :end end1 :from-end from-end) 650 (sequence:with-sequence-iterator (state2 limit2 from-end2 step2 endp2 elt2) 651 (sequence2 :start start2 :end end2 :from-end from-end) 652 (if from-end 653 (do ((result (or end1 (length sequence1)) (1- result)) 654 (e1 (funcall endp1 sequence1 state1 limit1 from-end1) 655 (funcall endp1 sequence1 state1 limit1 from-end1)) 656 (e2 (funcall endp2 sequence2 state2 limit2 from-end2) 657 (funcall endp2 sequence2 state2 limit2 from-end2))) 658 ((or e1 e2) (if (and e1 e2) nil result)) 659 (let ((o1 (funcall key (funcall elt1 sequence1 state1))) 660 (o2 (funcall key (funcall elt2 sequence2 state2)))) 661 (unless (funcall test o1 o2) 662 (return result)) 663 (setq state1 (funcall step1 sequence1 state1 from-end1)) 664 (setq state2 (funcall step2 sequence2 state2 from-end2)))) 665 (do ((result start1 (1+ result)) 666 (e1 (funcall endp1 sequence1 state1 limit1 from-end1) 667 (funcall endp1 sequence1 state1 limit1 from-end1)) 668 (e2 (funcall endp2 sequence2 state2 limit2 from-end2) 669 (funcall endp2 sequence2 state2 limit2 from-end2))) 670 ((or e1 e2) (if (and e1 e2) nil result)) 671 (let ((o1 (funcall key (funcall elt1 sequence1 state1))) 672 (o2 (funcall key (funcall elt2 sequence2 state2)))) 673 (unless (funcall test o1 o2) 674 (return result))) 675 (setq state1 (funcall step1 sequence1 state1 from-end1)) 676 (setq state2 (funcall step2 sequence2 state2 from-end2)))))))) 677 678(defgeneric sequence:search (sequence1 sequence2 &key from-end start1 end1 679 start2 end2 test test-not key)) 680(defmethod sequence:search 681 ((sequence1 sequence) (sequence2 sequence) &key from-end (start1 0) end1 682 (start2 0) end2 test test-not key) 683 (let ((test (sequence:canonize-test test test-not)) 684 (key (sequence:canonize-key key)) 685 (mainend2 (- (or end2 (length sequence2)) 686 (- (or end1 (length sequence1)) start1)))) 687 (when (< mainend2 0) 688 (return-from sequence:search nil)) 689 (sequence:with-sequence-iterator (statem limitm from-endm stepm endpm) 690 (sequence2 :start start2 :end mainend2 :from-end from-end) 691 (do ((s2 (if from-end mainend2 0) (if from-end (1- s2) (1+ s2)))) 692 (nil) 693 (sequence:with-sequence-iterator (state1 limit1 from-end1 step1 endp1 elt1) 694 (sequence1 :start start1 :end end1) 695 (sequence:with-sequence-iterator (state2 limit2 from-end2 step2 endp2 elt2) 696 (sequence2 :start s2) 697 (declare (ignore limit2 endp2)) 698 (when (do () 699 ((funcall endp1 sequence1 state1 limit1 from-end1) t) 700 (let ((o1 (funcall key (funcall elt1 sequence1 state1))) 701 (o2 (funcall key (funcall elt2 sequence2 state2)))) 702 (unless (funcall test o1 o2) 703 (return nil))) 704 (setq state1 (funcall step1 sequence1 state1 from-end1)) 705 (setq state2 (funcall step2 sequence2 state2 from-end2))) 706 (return-from sequence:search s2)))) 707 (when (funcall endpm sequence2 statem limitm from-endm) 708 (return nil)) 709 (setq statem (funcall stepm sequence2 statem from-endm)))))) 710 711(defgeneric sequence:delete 712 (item sequence &key from-end test test-not start end count key) 713 (:argument-precedence-order sequence item)) 714(defmethod sequence:delete (item (sequence sequence) &key 715 from-end test test-not (start 0) end count key) 716 (let ((test (sequence:canonize-test test test-not)) 717 (key (sequence:canonize-key key)) 718 (c 0)) 719 (sequence:with-sequence-iterator (state1 limit1 from-end1 step1 endp1 elt1 setelt1) 720 (sequence :start start :end end :from-end from-end) 721 (declare (ignore limit1 endp1 elt1)) 722 (sequence:with-sequence-iterator (state2 limit2 from-end2 step2 endp2 elt2) 723 (sequence :start start :end end :from-end from-end) 724 (flet ((finish () 725 (if from-end 726 (replace sequence sequence 727 :start1 start :end1 (- (length sequence) c) 728 :start2 (+ start c) :end2 (length sequence)) 729 (unless (or (null end) (= end (length sequence))) 730 (replace sequence sequence :start2 end :start1 (- end c) 731 :end1 (- (length sequence) c)))) 732 (sequence:adjust-sequence sequence (- (length sequence) c)))) 733 (declare (truly-dynamic-extent #'finish)) 734 (do () 735 ((funcall endp2 sequence state2 limit2 from-end2) (finish)) 736 (let ((e (funcall elt2 sequence state2))) 737 (loop 738 (when (and count (>= c count)) 739 (return)) 740 (if (funcall test item (funcall key e)) 741 (progn 742 (incf c) 743 (setq state2 (funcall step2 sequence state2 from-end2)) 744 (when (funcall endp2 sequence state2 limit2 from-end2) 745 (return-from sequence:delete (finish))) 746 (setq e (funcall elt2 sequence state2))) 747 (return))) 748 (funcall setelt1 e sequence state1)) 749 (setq state1 (funcall step1 sequence state1 from-end1)) 750 (setq state2 (funcall step2 sequence state2 from-end2)))))))) 751 752(defgeneric sequence:delete-if 753 (predicate sequence &key from-end start end count key) 754 (:argument-precedence-order sequence predicate)) 755(defmethod sequence:delete-if (predicate (sequence sequence) &key 756 from-end (start 0) end count key) 757 (let ((key (sequence:canonize-key key)) 758 (c 0)) 759 (sequence:with-sequence-iterator (state1 limit1 from-end1 step1 endp1 elt1 setelt1) 760 (sequence :start start :end end :from-end from-end) 761 (declare (ignore limit1 endp1 elt1)) 762 (sequence:with-sequence-iterator (state2 limit2 from-end2 step2 endp2 elt2) 763 (sequence :start start :end end :from-end from-end) 764 (flet ((finish () 765 (if from-end 766 (replace sequence sequence 767 :start1 start :end1 (- (length sequence) c) 768 :start2 (+ start c) :end2 (length sequence)) 769 (unless (or (null end) (= end (length sequence))) 770 (replace sequence sequence :start2 end :start1 (- end c) 771 :end1 (- (length sequence) c)))) 772 (sequence:adjust-sequence sequence (- (length sequence) c)))) 773 (declare (truly-dynamic-extent #'finish)) 774 (do () 775 ((funcall endp2 sequence state2 limit2 from-end2) (finish)) 776 (let ((e (funcall elt2 sequence state2))) 777 (loop 778 (when (and count (>= c count)) 779 (return)) 780 (if (funcall predicate (funcall key e)) 781 (progn 782 (incf c) 783 (setq state2 (funcall step2 sequence state2 from-end2)) 784 (when (funcall endp2 sequence state2 limit2 from-end2) 785 (return-from sequence:delete-if (finish))) 786 (setq e (funcall elt2 sequence state2))) 787 (return))) 788 (funcall setelt1 e sequence state1)) 789 (setq state1 (funcall step1 sequence state1 from-end1)) 790 (setq state2 (funcall step2 sequence state2 from-end2)))))))) 791 792(defgeneric sequence:delete-if-not 793 (predicate sequence &key from-end start end count key) 794 (:argument-precedence-order sequence predicate)) 795(defmethod sequence:delete-if-not (predicate (sequence sequence) &key 796 from-end (start 0) end count key) 797 (let ((key (sequence:canonize-key key)) 798 (c 0)) 799 (sequence:with-sequence-iterator (state1 limit1 from-end1 step1 endp1 elt1 setelt1) 800 (sequence :start start :end end :from-end from-end) 801 (declare (ignore limit1 endp1 elt1)) 802 (sequence:with-sequence-iterator (state2 limit2 from-end2 step2 endp2 elt2) 803 (sequence :start start :end end :from-end from-end) 804 (flet ((finish () 805 (if from-end 806 (replace sequence sequence 807 :start1 start :end1 (- (length sequence) c) 808 :start2 (+ start c) :end2 (length sequence)) 809 (unless (or (null end) (= end (length sequence))) 810 (replace sequence sequence :start2 end :start1 (- end c) 811 :end1 (- (length sequence) c)))) 812 (sequence:adjust-sequence sequence (- (length sequence) c)))) 813 (declare (truly-dynamic-extent #'finish)) 814 (do () 815 ((funcall endp2 sequence state2 limit2 from-end2) (finish)) 816 (let ((e (funcall elt2 sequence state2))) 817 (loop 818 (when (and count (>= c count)) 819 (return)) 820 (if (funcall predicate (funcall key e)) 821 (return) 822 (progn 823 (incf c) 824 (setq state2 (funcall step2 sequence state2 from-end2)) 825 (when (funcall endp2 sequence state2 limit2 from-end2) 826 (return-from sequence:delete-if-not (finish))) 827 (setq e (funcall elt2 sequence state2))))) 828 (funcall setelt1 e sequence state1)) 829 (setq state1 (funcall step1 sequence state1 from-end1)) 830 (setq state2 (funcall step2 sequence state2 from-end2)))))))) 831 832(defgeneric sequence:remove 833 (item sequence &key from-end test test-not start end count key) 834 (:argument-precedence-order sequence item)) 835(defmethod sequence:remove (item (sequence sequence) &rest args &key 836 from-end test test-not (start 0) end count key) 837 (declare (dynamic-extent args)) 838 (declare (ignore from-end test test-not start end count key)) 839 (let ((result (copy-seq sequence))) 840 (apply #'sequence:delete item result args))) 841 842(defgeneric sequence:remove-if 843 (predicate sequence &key from-end start end count key) 844 (:argument-precedence-order sequence predicate)) 845(defmethod sequence:remove-if (predicate (sequence sequence) &rest args &key 846 from-end (start 0) end count key) 847 (declare (truly-dynamic-extent args)) 848 (declare (ignore from-end start end count key)) 849 (let ((result (copy-seq sequence))) 850 (apply #'sequence:delete-if predicate result args))) 851 852(defgeneric sequence:remove-if-not 853 (predicate sequence &key from-end start end count key) 854 (:argument-precedence-order sequence predicate)) 855(defmethod sequence:remove-if-not (predicate (sequence sequence) &rest args 856 &key from-end (start 0) end count key) 857 (declare (truly-dynamic-extent args)) 858 (declare (ignore from-end start end count key)) 859 (let ((result (copy-seq sequence))) 860 (apply #'sequence:delete-if-not predicate result args))) 861 862(defgeneric sequence:delete-duplicates 863 (sequence &key from-end test test-not start end key)) 864(defmethod sequence:delete-duplicates 865 ((sequence sequence) &key from-end test test-not (start 0) end key) 866 (let ((test (sequence:canonize-test test test-not)) 867 (key (sequence:canonize-key key)) 868 (c 0)) 869 (sequence:with-sequence-iterator (state1 limit1 from-end1 step1 endp1 elt1 setelt1) 870 (sequence :start start :end end :from-end from-end) 871 (declare (ignore limit1 endp1 elt1)) 872 (sequence:with-sequence-iterator (state2 limit2 from-end2 step2 endp2 elt2) 873 (sequence :start start :end end :from-end from-end) 874 (flet ((finish () 875 (if from-end 876 (replace sequence sequence 877 :start1 start :end1 (- (length sequence) c) 878 :start2 (+ start c) :end2 (length sequence)) 879 (unless (or (null end) (= end (length sequence))) 880 (replace sequence sequence :start2 end :start1 (- end c) 881 :end1 (- (length sequence) c)))) 882 (sequence:adjust-sequence sequence (- (length sequence) c)))) 883 (declare (truly-dynamic-extent #'finish)) 884 (do ((end (or end (length sequence))) 885 (step 0 (1+ step))) 886 ((funcall endp2 sequence state2 limit2 from-end2) (finish)) 887 (let ((e (funcall elt2 sequence state2))) 888 (loop 889 ;; FIXME: replace with POSITION once position is 890 ;; working 891 (if (> (count (funcall key e) sequence :test test :key key 892 :start (if from-end start (+ start step 1)) 893 :end (if from-end (- end step 1) end)) 894 0) 895 (progn 896 (incf c) 897 (incf step) 898 (setq state2 (funcall step2 sequence state2 from-end2)) 899 (when (funcall endp2 sequence state2 limit2 from-end2) 900 (return-from sequence:delete-duplicates (finish))) 901 (setq e (funcall elt2 sequence state2))) 902 (progn 903 (return)))) 904 (funcall setelt1 e sequence state1)) 905 (setq state1 (funcall step1 sequence state1 from-end1)) 906 (setq state2 (funcall step2 sequence state2 from-end2)))))))) 907 908(defgeneric sequence:remove-duplicates 909 (sequence &key from-end test test-not start end key)) 910(defmethod sequence:remove-duplicates 911 ((sequence sequence) &rest args &key from-end test test-not (start 0) end key) 912 (declare (truly-dynamic-extent args)) 913 (declare (ignore from-end test test-not start end key)) 914 (let ((result (copy-seq sequence))) 915 (apply #'sequence:delete-duplicates result args))) 916 917(defgeneric sequence:sort (sequence predicate &key key)) 918(defmethod sequence:sort ((sequence sequence) predicate &rest args &key key) 919 (declare (dynamic-extent args)) 920 (declare (ignore key)) 921 (let* ((length (length sequence)) 922 (vector (make-array length))) 923 (sequence:with-sequence-iterator (state limit from-end step endp elt) 924 (sequence) 925 (declare (ignore limit endp)) 926 (do ((i 0 (1+ i))) 927 ((>= i length)) 928 (setf (aref vector i) (funcall elt sequence state)) 929 (setq state (funcall step sequence state from-end)))) 930 (apply #'cl:sort vector predicate args) 931 (sequence:with-sequence-iterator (state limit from-end step endp elt setelt) 932 (sequence) 933 (declare (ignore limit endp elt)) 934 (do ((i 0 (1+ i))) 935 ((>= i length) sequence) 936 (funcall setelt (aref vector i) sequence state) 937 (setq state (funcall step sequence state from-end)))))) 938 939(defgeneric sequence:stable-sort (sequence predicate &key key)) 940(defmethod sequence:stable-sort 941 ((sequence sequence) predicate &rest args &key key) 942 (declare (dynamic-extent args)) 943 (declare (ignore key)) 944 (let* ((length (length sequence)) 945 (vector (make-array length))) 946 (sequence:with-sequence-iterator (state limit from-end step endp elt) 947 (sequence) 948 (declare (ignore limit endp)) 949 (do ((i 0 (1+ i))) 950 ((>= i length)) 951 (setf (aref vector i) (funcall elt sequence state)) 952 (setq state (funcall step sequence state from-end)))) 953 (apply #'cl:stable-sort vector predicate args) 954 (sequence:with-sequence-iterator (state limit from-end step endp elt setelt) 955 (sequence) 956 (declare (ignore limit endp elt)) 957 (do ((i 0 (1+ i))) 958 ((>= i length) sequence) 959 (funcall setelt (aref vector i) sequence state) 960 (setq state (funcall step sequence state from-end)))))) 961 962;;LOOP extension 963(defun loop-elements-iteration-path (variable data-type prep-phrases) 964 (let (of-phrase) 965 (loop for (prep . rest) in prep-phrases do 966 (ecase prep 967 ((:of :in) (if of-phrase 968 (loop::loop-error "Too many prepositions") 969 (setq of-phrase rest))))) 970 (destructuring-bind (it lim f-e step endp elt seq) 971 (loop repeat 7 collect (gensym)) 972 (push `(let ((,seq ,(car of-phrase)))) loop::*loop-wrappers*) 973 (push `(sequence:with-sequence-iterator (,it ,lim ,f-e ,step ,endp ,elt) (,seq)) 974 loop::*loop-wrappers*) 975 `(((,variable nil ,data-type)) () () nil (funcall ,endp ,seq ,it ,lim ,f-e) 976 (,variable (funcall ,elt ,seq ,it) ,it (funcall ,step ,seq ,it ,f-e)))))) 977 978(loop::add-loop-path 979 '(element elements) 'loop-elements-iteration-path loop::*loop-ansi-universe* 980 :preposition-groups '((:of :in)) :inclusive-permitted nil) 981 982;;;DOSEQUENCE 983 984;;From SBCL 985(eval-when (:compile-toplevel :load-toplevel :execute) 986 (defun filter-dolist-declarations (decls) 987 (mapcar (lambda (decl) 988 `(declare ,@(remove-if 989 (lambda (clause) 990 (and (consp clause) 991 (or (eq (car clause) 'type) 992 (eq (car clause) 'ignore)))) 993 (cdr decl)))) 994 decls))) 995 996;; just like DOLIST, but with one-dimensional arrays 997(defmacro dovector ((elt vector &optional result) &body body) 998 (multiple-value-bind (forms decls) 999 (sys:parse-body body nil) 1000 (let ((index (gensym "INDEX")) (length (gensym "LENGTH")) (vec (gensym "VEC"))) 1001 `(let ((,vec ,vector)) 1002 (declare (type vector ,vec)) 1003 (do ((,index 0 (1+ ,index)) 1004 (,length (length ,vec))) 1005 ((>= ,index ,length) (let ((,elt nil)) 1006 ,@(filter-dolist-declarations decls) 1007 ,elt 1008 ,result)) 1009 (let ((,elt (aref ,vec ,index))) 1010 ,@decls 1011 (tagbody 1012 ,@forms))))))) 1013 1014(defmacro sequence:dosequence ((e sequence &optional return &rest args &key 1015 from-end start end) &body body) 1016 (declare (ignore from-end start end)) 1017 (multiple-value-bind (forms decls) 1018 (sys:parse-body body nil) 1019 (let ((s sequence) 1020 (sequence (gensym "SEQUENCE"))) 1021 `(block nil 1022 (let ((,sequence ,s)) 1023 (seq-dispatch ,sequence 1024 (dolist (,e ,sequence ,return) ,@body) 1025 (dovector (,e ,sequence ,return) ,@body) 1026 (multiple-value-bind (state limit from-end step endp elt) 1027 (sequence:make-sequence-iterator ,sequence ,@args) 1028 (do ((state state (funcall step ,sequence state from-end))) 1029 ((funcall endp ,sequence state limit from-end) 1030 (let ((,e nil)) 1031 ,@(filter-dolist-declarations decls) 1032 ,e 1033 ,return)) 1034 (let ((,e (funcall elt ,sequence state))) 1035 ,@decls 1036 (tagbody 1037 ,@forms)))))))))) 1038 1039(provide "EXTENSIBLE-SEQUENCES") 1040