src/code/pprint.lisp

   1 ;;;; Common Lisp pretty printer
   2
   3 ;;;; This software is part of the SBCL system. See the README file for
   4 ;;;; more information.
   5 ;;;;
   6 ;;;; This software is derived from the CMU CL system, which was
   7 ;;;; written at Carnegie Mellon University and released into the
   8 ;;;; public domain. The software is in the public domain and is
   9 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
  10 ;;;; files for more information.
  11
  12 (in-package "SB!PRETTY")
  13 \f
  14 ;;;; pretty streams
  15
  16 ;;; There are three different units for measuring character positions:
  17 ;;;  COLUMN - offset (if characters) from the start of the current line
  18 ;;;  INDEX  - index into the output buffer
  19 ;;;  POSN   - some position in the stream of characters cycling through
  20 ;;;           the output buffer
  21 (deftype column ()
  22   '(and fixnum unsigned-byte))
  23 ;;; The INDEX type is picked up from the kernel package.
  24 (deftype posn ()
  25   'fixnum)
  26
  27 (defconstant initial-buffer-size 128)
  28
  29 (defconstant default-line-length 80)
  30
  31 (defstruct (pretty-stream (:include sb!kernel:ansi-stream
  32                                     (out #'pretty-out)
  33                                     (sout #'pretty-sout)
  34                                     (misc #'pretty-misc))
  35                           (:constructor make-pretty-stream (target))
  36                           (:copier nil))
  37   ;; Where the output is going to finally go.
  38   (target (missing-arg) :type stream)
  39   ;; Line length we should format to. Cached here so we don't have to keep
  40   ;; extracting it from the target stream.
  41   (line-length (or *print-right-margin*
  42                    (sb!impl::line-length target)
  43                    default-line-length)
  44                :type column)
  45   ;; A simple string holding all the text that has been output but not yet
  46   ;; printed.
  47   (buffer (make-string initial-buffer-size) :type (simple-array character (*)))
  48   ;; The index into BUFFER where more text should be put.
  49   (buffer-fill-pointer 0 :type index)
  50   ;; Whenever we output stuff from the buffer, we shift the remaining noise
  51   ;; over. This makes it difficult to keep references to locations in
  52   ;; the buffer. Therefore, we have to keep track of the total amount of
  53   ;; stuff that has been shifted out of the buffer.
  54   (buffer-offset 0 :type posn)
  55   ;; The column the first character in the buffer will appear in. Normally
  56   ;; zero, but if we end up with a very long line with no breaks in it we
  57   ;; might have to output part of it. Then this will no longer be zero.
  58   (buffer-start-column (or (sb!impl::charpos target) 0) :type column)
  59   ;; The line number we are currently on. Used for *PRINT-LINES*
  60   ;; abbreviations and to tell when sections have been split across
  61   ;; multiple lines.
  62   (line-number 0 :type index)
  63   ;; the value of *PRINT-LINES* captured at object creation time. We
  64   ;; use this, instead of the dynamic *PRINT-LINES*, to avoid
  65   ;; weirdness like
  66   ;;   (let ((*print-lines* 50))
  67   ;;     (pprint-logical-block ..
  68   ;;       (dotimes (i 10)
  69   ;;         (let ((*print-lines* 8))
  70   ;;           (print (aref possiblybigthings i) prettystream)))))
  71   ;; terminating the output of the entire logical blockafter 8 lines.
  72   (print-lines *print-lines* :type (or index null) :read-only t)
  73   ;; Stack of logical blocks in effect at the buffer start.
  74   (blocks (list (make-logical-block)) :type list)
  75   ;; Buffer holding the per-line prefix active at the buffer start.
  76   ;; Indentation is included in this. The length of this is stored
  77   ;; in the logical block stack.
  78   (prefix (make-string initial-buffer-size) :type simple-string)
  79   ;; Buffer holding the total remaining suffix active at the buffer start.
  80   ;; The characters are right-justified in the buffer to make it easier
  81   ;; to output the buffer. The length is stored in the logical block
  82   ;; stack.
  83   (suffix (make-string initial-buffer-size) :type simple-string)
  84   ;; Queue of pending operations. When empty, HEAD=TAIL=NIL. Otherwise,
  85   ;; TAIL holds the first (oldest) cons and HEAD holds the last (newest)
  86   ;; cons. Adding things to the queue is basically (setf (cdr head) (list
  87   ;; new)) and removing them is basically (pop tail) [except that care must
  88   ;; be taken to handle the empty queue case correctly.]
  89   (queue-tail nil :type list)
  90   (queue-head nil :type list)
  91   ;; Block-start queue entries in effect at the queue head.
  92   (pending-blocks nil :type list))
  93 (def!method print-object ((pstream pretty-stream) stream)
  94   ;; FIXME: CMU CL had #+NIL'ed out this code and done a hand-written
  95   ;; FORMAT hack instead. Make sure that this code actually works instead
  96   ;; of falling into infinite regress or something.
  97   (print-unreadable-object (pstream stream :type t :identity t)))
  98
  99 #!-sb-fluid (declaim (inline index-posn posn-index posn-column))
 100 (defun index-posn (index stream)
 101   (declare (type index index) (type pretty-stream stream)
 102            (values posn))
 103   (+ index (pretty-stream-buffer-offset stream)))
 104 (defun posn-index (posn stream)
 105   (declare (type posn posn) (type pretty-stream stream)
 106            (values index))
 107   (- posn (pretty-stream-buffer-offset stream)))
 108 (defun posn-column (posn stream)
 109   (declare (type posn posn) (type pretty-stream stream)
 110            (values posn))
 111   (index-column (posn-index posn stream) stream))
 112
 113 ;;; Is it OK to do pretty printing on this stream at this time?
 114 (defun print-pretty-on-stream-p (stream)
 115   (and (pretty-stream-p stream)
 116        *print-pretty*))
 117 \f
 118 ;;;; stream interface routines
 119
 120 (defun pretty-out (stream char)
 121   (declare (type pretty-stream stream)
 122            (type character char))
 123   (cond ((char= char #\newline)
 124          (enqueue-newline stream :literal))
 125         (t
 126          (ensure-space-in-buffer stream 1)
 127          (let ((fill-pointer (pretty-stream-buffer-fill-pointer stream)))
 128            (setf (schar (pretty-stream-buffer stream) fill-pointer) char)
 129            (setf (pretty-stream-buffer-fill-pointer stream)
 130                  (1+ fill-pointer))))))
 131
 132 (defun pretty-sout (stream string start end)
 133   (declare (type pretty-stream stream)
 134            (type simple-string string)
 135            (type index start)
 136            (type (or index null) end))
 137   (let* ((end (or end (length string))))
 138     (unless (= start end)
 139       (sb!impl::string-dispatch (simple-base-string
 140                                  #!+sb-unicode
 141                                  (simple-array character (*)))
 142           string
 143         ;; For POSITION transform
 144         (declare (optimize (speed 2)))
 145         (let ((newline (position #\newline string :start start :end end)))
 146           (cond
 147             (newline
 148              (pretty-sout stream string start newline)
 149              (enqueue-newline stream :literal)
 150              (pretty-sout stream string (1+ newline) end))
 151             (t
 152              (let ((chars (- end start)))
 153                (loop
 154                   (let* ((available (ensure-space-in-buffer stream chars))
 155                          (count (min available chars))
 156                          (fill-pointer (pretty-stream-buffer-fill-pointer
 157                                         stream))
 158                          (new-fill-ptr (+ fill-pointer count)))
 159                     (if (typep string 'simple-base-string)
 160                         ;; FIXME: Reimplementing REPLACE, since it
 161                         ;; can't be inlined and we don't have a
 162                         ;; generic "simple-array -> simple-array"
 163                         ;; transform for it.
 164                         (loop for i from fill-pointer below new-fill-ptr
 165                               for j from start
 166                               with target = (pretty-stream-buffer stream)
 167                               do (setf (aref target i)
 168                                        (aref string j)))
 169                         (replace (pretty-stream-buffer stream)
 170                                  string
 171                                  :start1 fill-pointer :end1 new-fill-ptr
 172                                  :start2 start))
 173                     (setf (pretty-stream-buffer-fill-pointer stream)
 174                           new-fill-ptr)
 175                     (decf chars count)
 176                     (when (zerop count)
 177                       (return))
 178                     (incf start count)))))))))))
 179
 180 (defun pretty-misc (stream op &optional arg1 arg2)
 181   (declare (ignore stream op arg1 arg2)))
 182 \f
 183 ;;;; logical blocks
 184
 185 (defstruct (logical-block (:copier nil))
 186   ;; The column this logical block started in.
 187   (start-column 0 :type column)
 188   ;; The column the current section started in.
 189   (section-column 0 :type column)
 190   ;; The length of the per-line prefix. We can't move the indentation
 191   ;; left of this.
 192   (per-line-prefix-end 0 :type index)
 193   ;; The overall length of the prefix, including any indentation.
 194   (prefix-length 0 :type index)
 195   ;; The overall length of the suffix.
 196   (suffix-length 0 :type index)
 197   ;; The line number
 198   (section-start-line 0 :type index))
 199
 200 (defun really-start-logical-block (stream column prefix suffix)
 201   (let* ((blocks (pretty-stream-blocks stream))
 202          (prev-block (car blocks))
 203          (per-line-end (logical-block-per-line-prefix-end prev-block))
 204          (prefix-length (logical-block-prefix-length prev-block))
 205          (suffix-length (logical-block-suffix-length prev-block))
 206          (block (make-logical-block
 207                  :start-column column
 208                  :section-column column
 209                  :per-line-prefix-end per-line-end
 210                  :prefix-length prefix-length
 211                  :suffix-length suffix-length
 212                  :section-start-line (pretty-stream-line-number stream))))
 213     (setf (pretty-stream-blocks stream) (cons block blocks))
 214     (set-indentation stream column)
 215     (when prefix
 216       (setf (logical-block-per-line-prefix-end block) column)
 217       (replace (pretty-stream-prefix stream) prefix
 218                :start1 (- column (length prefix)) :end1 column))
 219     (when suffix
 220       (let* ((total-suffix (pretty-stream-suffix stream))
 221              (total-suffix-len (length total-suffix))
 222              (additional (length suffix))
 223              (new-suffix-len (+ suffix-length additional)))
 224         (when (> new-suffix-len total-suffix-len)
 225           (let ((new-total-suffix-len
 226                  (max (* total-suffix-len 2)
 227                       (+ suffix-length
 228                          (floor (* additional 5) 4)))))
 229             (setf total-suffix
 230                   (replace (make-string new-total-suffix-len) total-suffix
 231                            :start1 (- new-total-suffix-len suffix-length)
 232                            :start2 (- total-suffix-len suffix-length)))
 233             (setf total-suffix-len new-total-suffix-len)
 234             (setf (pretty-stream-suffix stream) total-suffix)))
 235         (replace total-suffix suffix
 236                  :start1 (- total-suffix-len new-suffix-len)
 237                  :end1 (- total-suffix-len suffix-length))
 238         (setf (logical-block-suffix-length block) new-suffix-len))))
 239   nil)
 240
 241 (defun set-indentation (stream column)
 242   (let* ((prefix (pretty-stream-prefix stream))
 243          (prefix-len (length prefix))
 244          (block (car (pretty-stream-blocks stream)))
 245          (current (logical-block-prefix-length block))
 246          (minimum (logical-block-per-line-prefix-end block))
 247          (column (max minimum column)))
 248     (when (> column prefix-len)
 249       (setf prefix
 250             (replace (make-string (max (* prefix-len 2)
 251                                        (+ prefix-len
 252                                           (floor (* (- column prefix-len) 5)
 253                                                  4))))
 254                      prefix
 255                      :end1 current))
 256       (setf (pretty-stream-prefix stream) prefix))
 257     (when (> column current)
 258       (fill prefix #\space :start current :end column))
 259     (setf (logical-block-prefix-length block) column)))
 260
 261 (defun really-end-logical-block (stream)
 262   (let* ((old (pop (pretty-stream-blocks stream)))
 263          (old-indent (logical-block-prefix-length old))
 264          (new (car (pretty-stream-blocks stream)))
 265          (new-indent (logical-block-prefix-length new)))
 266     (when (> new-indent old-indent)
 267       (fill (pretty-stream-prefix stream) #\space
 268             :start old-indent :end new-indent)))
 269   nil)
 270 \f
 271 ;;;; the pending operation queue
 272
 273 (defstruct (queued-op (:constructor nil)
 274                       (:copier nil))
 275   (posn 0 :type posn))
 276
 277 (defmacro enqueue (stream type &rest args)
 278   (let ((constructor (symbolicate "MAKE-" type)))
 279     (once-only ((stream stream)
 280                 (entry `(,constructor :posn
 281                                       (index-posn
 282                                        (pretty-stream-buffer-fill-pointer
 283                                         ,stream)
 284                                        ,stream)
 285                                       ,@args))
 286                 (op `(list ,entry))
 287                 (head `(pretty-stream-queue-head ,stream)))
 288       `(progn
 289          (if ,head
 290              (setf (cdr ,head) ,op)
 291              (setf (pretty-stream-queue-tail ,stream) ,op))
 292          (setf (pretty-stream-queue-head ,stream) ,op)
 293          ,entry))))
 294
 295 (defstruct (section-start (:include queued-op)
 296                           (:constructor nil)
 297                           (:copier nil))
 298   (depth 0 :type index)
 299   (section-end nil :type (or null newline block-end)))
 300
 301 (defstruct (newline (:include section-start)
 302                     (:copier nil))
 303   (kind (missing-arg)
 304         :type (member :linear :fill :miser :literal :mandatory)))
 305
 306 (defun enqueue-newline (stream kind)
 307   (let* ((depth (length (pretty-stream-pending-blocks stream)))
 308          (newline (enqueue stream newline :kind kind :depth depth)))
 309     (dolist (entry (pretty-stream-queue-tail stream))
 310       (when (and (not (eq newline entry))
 311                  (section-start-p entry)
 312                  (null (section-start-section-end entry))
 313                  (<= depth (section-start-depth entry)))
 314         (setf (section-start-section-end entry) newline))))
 315   (maybe-output stream (or (eq kind :literal) (eq kind :mandatory))))
 316
 317 (defstruct (indentation (:include queued-op)
 318                         (:copier nil))
 319   (kind (missing-arg) :type (member :block :current))
 320   (amount 0 :type fixnum))
 321
 322 (defun enqueue-indent (stream kind amount)
 323   (enqueue stream indentation :kind kind :amount amount))
 324
 325 (defstruct (block-start (:include section-start)
 326                         (:copier nil))
 327   (block-end nil :type (or null block-end))
 328   (prefix nil :type (or null simple-string))
 329   (suffix nil :type (or null simple-string)))
 330
 331 (defun start-logical-block (stream prefix per-line-p suffix)
 332   ;; (In the PPRINT-LOGICAL-BLOCK form which calls us,
 333   ;; :PREFIX and :PER-LINE-PREFIX have hairy defaulting behavior,
 334   ;; and might end up being NIL.)
 335   (declare (type (or null string) prefix))
 336   ;; (But the defaulting behavior of PPRINT-LOGICAL-BLOCK :SUFFIX is
 337   ;; trivial, so it should always be a string.)
 338   (declare (type string suffix))
 339   (when prefix
 340     (unless (typep prefix 'simple-string)
 341       (setq prefix (coerce prefix '(simple-array character (*)))))
 342     (pretty-sout stream prefix 0 (length prefix)))
 343   (unless (typep suffix 'simple-string)
 344     (setq suffix (coerce suffix '(simple-array character (*)))))
 345   (let* ((pending-blocks (pretty-stream-pending-blocks stream))
 346          (start (enqueue stream block-start
 347                          :prefix (and per-line-p prefix)
 348                          :suffix suffix
 349                          :depth (length pending-blocks))))
 350     (setf (pretty-stream-pending-blocks stream)
 351           (cons start pending-blocks))))
 352
 353 (defstruct (block-end (:include queued-op)
 354                       (:copier nil))
 355   (suffix nil :type (or null simple-string)))
 356
 357 (defun end-logical-block (stream)
 358   (let* ((start (pop (pretty-stream-pending-blocks stream)))
 359          (suffix (block-start-suffix start))
 360          (end (enqueue stream block-end :suffix suffix)))
 361     (when suffix
 362       (pretty-sout stream suffix 0 (length suffix)))
 363     (setf (block-start-block-end start) end)))
 364
 365 (defstruct (tab (:include queued-op)
 366                 (:copier nil))
 367   (sectionp nil :type (member t nil))
 368   (relativep nil :type (member t nil))
 369   (colnum 0 :type column)
 370   (colinc 0 :type column))
 371
 372 (defun enqueue-tab (stream kind colnum colinc)
 373   (multiple-value-bind (sectionp relativep)
 374       (ecase kind
 375         (:line (values nil nil))
 376         (:line-relative (values nil t))
 377         (:section (values t nil))
 378         (:section-relative (values t t)))
 379     (enqueue stream tab :sectionp sectionp :relativep relativep
 380              :colnum colnum :colinc colinc)))
 381 \f
 382 ;;;; tab support
 383
 384 (defun compute-tab-size (tab section-start column)
 385   (let* ((origin (if (tab-sectionp tab) section-start 0))
 386          (colnum (tab-colnum tab))
 387          (colinc (tab-colinc tab))
 388          (position (- column origin)))
 389     (cond ((tab-relativep tab)
 390            (unless (<= colinc 1)
 391              (let ((newposn (+ position colnum)))
 392                (let ((rem (rem newposn colinc)))
 393                  (unless (zerop rem)
 394                    (incf colnum (- colinc rem))))))
 395            colnum)
 396           ((< position colnum)
 397            (- colnum position))
 398           ((zerop colinc) 0)
 399           (t
 400            (- colinc
 401               (rem (- position colnum) colinc))))))
 402
 403 (defun index-column (index stream)
 404   (let ((column (pretty-stream-buffer-start-column stream))
 405         (section-start (logical-block-section-column
 406                         (first (pretty-stream-blocks stream))))
 407         (end-posn (index-posn index stream)))
 408     (dolist (op (pretty-stream-queue-tail stream))
 409       (when (>= (queued-op-posn op) end-posn)
 410         (return))
 411       (typecase op
 412         (tab
 413          (incf column
 414                (compute-tab-size op
 415                                  section-start
 416                                  (+ column
 417                                     (posn-index (tab-posn op)
 418                                                     stream)))))
 419         ((or newline block-start)
 420          (setf section-start
 421                (+ column (posn-index (queued-op-posn op)
 422                                          stream))))))
 423     (+ column index)))
 424
 425 (defun expand-tabs (stream through)
 426   (let ((insertions nil)
 427         (additional 0)
 428         (column (pretty-stream-buffer-start-column stream))
 429         (section-start (logical-block-section-column
 430                         (first (pretty-stream-blocks stream)))))
 431     (dolist (op (pretty-stream-queue-tail stream))
 432       (typecase op
 433         (tab
 434          (let* ((index (posn-index (tab-posn op) stream))
 435                 (tabsize (compute-tab-size op
 436                                            section-start
 437                                            (+ column index))))
 438            (unless (zerop tabsize)
 439              (push (cons index tabsize) insertions)
 440              (incf additional tabsize)
 441              (incf column tabsize))))
 442         ((or newline block-start)
 443          (setf section-start
 444                (+ column (posn-index (queued-op-posn op) stream)))))
 445       (when (eq op through)
 446         (return)))
 447     (when insertions
 448       (let* ((fill-ptr (pretty-stream-buffer-fill-pointer stream))
 449              (new-fill-ptr (+ fill-ptr additional))
 450              (buffer (pretty-stream-buffer stream))
 451              (new-buffer buffer)
 452              (length (length buffer))
 453              (end fill-ptr))
 454         (when (> new-fill-ptr length)
 455           (let ((new-length (max (* length 2)
 456                                  (+ fill-ptr
 457                                     (floor (* additional 5) 4)))))
 458             (setf new-buffer (make-string new-length))
 459             (setf (pretty-stream-buffer stream) new-buffer)))
 460         (setf (pretty-stream-buffer-fill-pointer stream) new-fill-ptr)
 461         (decf (pretty-stream-buffer-offset stream) additional)
 462         (dolist (insertion insertions)
 463           (let* ((srcpos (car insertion))
 464                  (amount (cdr insertion))
 465                  (dstpos (+ srcpos additional)))
 466             (replace new-buffer buffer :start1 dstpos :start2 srcpos :end2 end)
 467             (fill new-buffer #\space :start (- dstpos amount) :end dstpos)
 468             (decf additional amount)
 469             (setf end srcpos)))
 470         (unless (eq new-buffer buffer)
 471           (replace new-buffer buffer :end1 end :end2 end))))))
 472 \f
 473 ;;;; stuff to do the actual outputting
 474
 475 (defun ensure-space-in-buffer (stream want)
 476   (declare (type pretty-stream stream)
 477            (type index want))
 478   (let* ((buffer (pretty-stream-buffer stream))
 479          (length (length buffer))
 480          (fill-ptr (pretty-stream-buffer-fill-pointer stream))
 481          (available (- length fill-ptr)))
 482     (cond ((plusp available)
 483            available)
 484           ((> fill-ptr (pretty-stream-line-length stream))
 485            (unless (maybe-output stream nil)
 486              (output-partial-line stream))
 487            (ensure-space-in-buffer stream want))
 488           (t
 489            (let* ((new-length (max (* length 2)
 490                                    (+ length
 491                                       (floor (* want 5) 4))))
 492                   (new-buffer (make-string new-length)))
 493              (setf (pretty-stream-buffer stream) new-buffer)
 494              (replace new-buffer buffer :end1 fill-ptr)
 495              (- new-length fill-ptr))))))
 496
 497 (defun maybe-output (stream force-newlines-p)
 498   (declare (type pretty-stream stream))
 499   (let ((tail (pretty-stream-queue-tail stream))
 500         (output-anything nil))
 501     (loop
 502       (unless tail
 503         (setf (pretty-stream-queue-head stream) nil)
 504         (return))
 505       (let ((next (pop tail)))
 506         (etypecase next
 507           (newline
 508            (when (ecase (newline-kind next)
 509                    ((:literal :mandatory :linear) t)
 510                    (:miser (misering-p stream))
 511                    (:fill
 512                     (or (misering-p stream)
 513                         (> (pretty-stream-line-number stream)
 514                            (logical-block-section-start-line
 515                             (first (pretty-stream-blocks stream))))
 516                         (ecase (fits-on-line-p stream
 517                                                (newline-section-end next)
 518                                                force-newlines-p)
 519                           ((t) nil)
 520                           ((nil) t)
 521                           (:dont-know
 522                            (return))))))
 523              (setf output-anything t)
 524              (output-line stream next)))
 525           (indentation
 526            (unless (misering-p stream)
 527              (set-indentation stream
 528                               (+ (ecase (indentation-kind next)
 529                                    (:block
 530                                     (logical-block-start-column
 531                                      (car (pretty-stream-blocks stream))))
 532                                    (:current
 533                                     (posn-column
 534                                      (indentation-posn next)
 535                                      stream)))
 536                                  (indentation-amount next)))))
 537           (block-start
 538            (ecase (fits-on-line-p stream (block-start-section-end next)
 539                                   force-newlines-p)
 540              ((t)
 541               ;; Just nuke the whole logical block and make it look
 542               ;; like one nice long literal.
 543               (let ((end (block-start-block-end next)))
 544                 (expand-tabs stream end)
 545                 (setf tail (cdr (member end tail)))))
 546              ((nil)
 547               (really-start-logical-block
 548                stream
 549                (posn-column (block-start-posn next) stream)
 550                (block-start-prefix next)
 551                (block-start-suffix next)))
 552              (:dont-know
 553               (return))))
 554           (block-end
 555            (really-end-logical-block stream))
 556           (tab
 557            (expand-tabs stream next))))
 558       (setf (pretty-stream-queue-tail stream) tail))
 559     output-anything))
 560
 561 (defun misering-p (stream)
 562   (declare (type pretty-stream stream))
 563   (and *print-miser-width*
 564        (<= (- (pretty-stream-line-length stream)
 565               (logical-block-start-column (car (pretty-stream-blocks stream))))
 566            *print-miser-width*)))
 567
 568 (defun fits-on-line-p (stream until force-newlines-p)
 569   (let ((available (pretty-stream-line-length stream)))
 570     (when (and (not *print-readably*)
 571                (pretty-stream-print-lines stream)
 572                (= (pretty-stream-print-lines stream)
 573                   (pretty-stream-line-number stream)))
 574       (decf available 3) ; for the `` ..''
 575       (decf available (logical-block-suffix-length
 576                        (car (pretty-stream-blocks stream)))))
 577     (cond (until
 578            (<= (posn-column (queued-op-posn until) stream) available))
 579           (force-newlines-p nil)
 580           ((> (index-column (pretty-stream-buffer-fill-pointer stream) stream)
 581               available)
 582            nil)
 583           (t
 584            :dont-know))))
 585
 586 (defun output-line (stream until)
 587   (declare (type pretty-stream stream)
 588            (type newline until))
 589   (let* ((target (pretty-stream-target stream))
 590          (buffer (pretty-stream-buffer stream))
 591          (kind (newline-kind until))
 592          (literal-p (eq kind :literal))
 593          (amount-to-consume (posn-index (newline-posn until) stream))
 594          (amount-to-print
 595           (if literal-p
 596               amount-to-consume
 597               (let ((last-non-blank
 598                      (position #\space buffer :end amount-to-consume
 599                                :from-end t :test #'char/=)))
 600                 (if last-non-blank
 601                     (1+ last-non-blank)
 602                     0)))))
 603     (write-string buffer target :end amount-to-print)
 604     (let ((line-number (pretty-stream-line-number stream)))
 605       (incf line-number)
 606       (when (and (not *print-readably*)
 607                  (pretty-stream-print-lines stream)
 608                  (>= line-number (pretty-stream-print-lines stream)))
 609         (write-string " .." target)
 610         (let ((suffix-length (logical-block-suffix-length
 611                               (car (pretty-stream-blocks stream)))))
 612           (unless (zerop suffix-length)
 613             (let* ((suffix (pretty-stream-suffix stream))
 614                    (len (length suffix)))
 615               (write-string suffix target
 616                             :start (- len suffix-length)
 617                             :end len))))
 618         (throw 'line-limit-abbreviation-happened t))
 619       (setf (pretty-stream-line-number stream) line-number)
 620       (write-char #\newline target)
 621       (setf (pretty-stream-buffer-start-column stream) 0)
 622       (let* ((fill-ptr (pretty-stream-buffer-fill-pointer stream))
 623              (block (first (pretty-stream-blocks stream)))
 624              (prefix-len
 625               (if literal-p
 626                   (logical-block-per-line-prefix-end block)
 627                   (logical-block-prefix-length block)))
 628              (shift (- amount-to-consume prefix-len))
 629              (new-fill-ptr (- fill-ptr shift))
 630              (new-buffer buffer)
 631              (buffer-length (length buffer)))
 632         (when (> new-fill-ptr buffer-length)
 633           (setf new-buffer
 634                 (make-string (max (* buffer-length 2)
 635                                   (+ buffer-length
 636                                      (floor (* (- new-fill-ptr buffer-length)
 637                                                5)
 638                                             4)))))
 639           (setf (pretty-stream-buffer stream) new-buffer))
 640         (replace new-buffer buffer
 641                  :start1 prefix-len :start2 amount-to-consume :end2 fill-ptr)
 642         (replace new-buffer (pretty-stream-prefix stream)
 643                  :end1 prefix-len)
 644         (setf (pretty-stream-buffer-fill-pointer stream) new-fill-ptr)
 645         (incf (pretty-stream-buffer-offset stream) shift)
 646         (unless literal-p
 647           (setf (logical-block-section-column block) prefix-len)
 648           (setf (logical-block-section-start-line block) line-number))))))
 649
 650 (defun output-partial-line (stream)
 651   (let* ((fill-ptr (pretty-stream-buffer-fill-pointer stream))
 652          (tail (pretty-stream-queue-tail stream))
 653          (count
 654           (if tail
 655               (posn-index (queued-op-posn (car tail)) stream)
 656               fill-ptr))
 657          (new-fill-ptr (- fill-ptr count))
 658          (buffer (pretty-stream-buffer stream)))
 659     (when (zerop count)
 660       (error "Output-partial-line called when nothing can be output."))
 661     (write-string buffer (pretty-stream-target stream)
 662                   :start 0 :end count)
 663     (incf (pretty-stream-buffer-start-column stream) count)
 664     (replace buffer buffer :end1 new-fill-ptr :start2 count :end2 fill-ptr)
 665     (setf (pretty-stream-buffer-fill-pointer stream) new-fill-ptr)
 666     (incf (pretty-stream-buffer-offset stream) count)))
 667
 668 (defun force-pretty-output (stream)
 669   (maybe-output stream nil)
 670   (expand-tabs stream nil)
 671   (write-string (pretty-stream-buffer stream)
 672                 (pretty-stream-target stream)
 673                 :end (pretty-stream-buffer-fill-pointer stream)))
 674 \f
 675 ;;;; user interface to the pretty printer
 676
 677 (defun pprint-newline (kind &optional stream)
 678   #!+sb-doc
 679   "Output a conditional newline to STREAM (which defaults to
 680    *STANDARD-OUTPUT*) if it is a pretty-printing stream, and do
 681    nothing if not. KIND can be one of:
 682      :LINEAR - A line break is inserted if and only if the immediatly
 683         containing section cannot be printed on one line.
 684      :MISER - Same as LINEAR, but only if ``miser-style'' is in effect.
 685         (See *PRINT-MISER-WIDTH*.)
 686      :FILL - A line break is inserted if and only if either:
 687        (a) the following section cannot be printed on the end of the
 688            current line,
 689        (b) the preceding section was not printed on a single line, or
 690        (c) the immediately containing section cannot be printed on one
 691            line and miser-style is in effect.
 692      :MANDATORY - A line break is always inserted.
 693    When a line break is inserted by any type of conditional newline, any
 694    blanks that immediately precede the conditional newline are ommitted
 695    from the output and indentation is introduced at the beginning of the
 696    next line. (See PPRINT-INDENT.)"
 697   (declare (type (member :linear :miser :fill :mandatory) kind)
 698            (type (or stream (member t nil)) stream)
 699            (values null))
 700   (let ((stream (case stream
 701                   ((t) *terminal-io*)
 702                   ((nil) *standard-output*)
 703                   (t stream))))
 704     (when (print-pretty-on-stream-p stream)
 705       (enqueue-newline stream kind)))
 706   nil)
 707
 708 (defun pprint-indent (relative-to n &optional stream)
 709   #!+sb-doc
 710   "Specify the indentation to use in the current logical block if
 711 STREAM \(which defaults to *STANDARD-OUTPUT*) is a pretty-printing
 712 stream and do nothing if not. (See PPRINT-LOGICAL-BLOCK.) N is the
 713 indentation to use (in ems, the width of an ``m'') and RELATIVE-TO can
 714 be either:
 715
 716      :BLOCK - Indent relative to the column the current logical block
 717         started on.
 718
 719      :CURRENT - Indent relative to the current column.
 720
 721 The new indentation value does not take effect until the following
 722 line break."
 723   (declare (type (member :block :current) relative-to)
 724            (type real n)
 725            (type (or stream (member t nil)) stream)
 726            (values null))
 727   (let ((stream (case stream
 728                   ((t) *terminal-io*)
 729                   ((nil) *standard-output*)
 730                   (t stream))))
 731     (when (print-pretty-on-stream-p stream)
 732       (enqueue-indent stream relative-to (truncate n))))
 733   nil)
 734
 735 (defun pprint-tab (kind colnum colinc &optional stream)
 736   #!+sb-doc
 737   "If STREAM (which defaults to *STANDARD-OUTPUT*) is a pretty-printing
 738    stream, perform tabbing based on KIND, otherwise do nothing. KIND can
 739    be one of:
 740      :LINE - Tab to column COLNUM. If already past COLNUM tab to the next
 741        multiple of COLINC.
 742      :SECTION - Same as :LINE, but count from the start of the current
 743        section, not the start of the line.
 744      :LINE-RELATIVE - Output COLNUM spaces, then tab to the next multiple of
 745        COLINC.
 746      :SECTION-RELATIVE - Same as :LINE-RELATIVE, but count from the start
 747        of the current section, not the start of the line."
 748   (declare (type (member :line :section :line-relative :section-relative) kind)
 749            (type unsigned-byte colnum colinc)
 750            (type (or stream (member t nil)) stream)
 751            (values null))
 752   (let ((stream (case stream
 753                   ((t) *terminal-io*)
 754                   ((nil) *standard-output*)
 755                   (t stream))))
 756     (when (print-pretty-on-stream-p stream)
 757       (enqueue-tab stream kind colnum colinc)))
 758   nil)
 759
 760 (defun pprint-fill (stream list &optional (colon? t) atsign?)
 761   #!+sb-doc
 762   "Output LIST to STREAM putting :FILL conditional newlines between each
 763    element. If COLON? is NIL (defaults to T), then no parens are printed
 764    around the output. ATSIGN? is ignored (but allowed so that PPRINT-FILL
 765    can be used with the ~/.../ format directive."
 766   (declare (ignore atsign?))
 767   (pprint-logical-block (stream list
 768                                 :prefix (if colon? "(" "")
 769                                 :suffix (if colon? ")" ""))
 770     (pprint-exit-if-list-exhausted)
 771     (loop
 772       (output-object (pprint-pop) stream)
 773       (pprint-exit-if-list-exhausted)
 774       (write-char #\space stream)
 775       (pprint-newline :fill stream))))
 776
 777 (defun pprint-linear (stream list &optional (colon? t) atsign?)
 778   #!+sb-doc
 779   "Output LIST to STREAM putting :LINEAR conditional newlines between each
 780    element. If COLON? is NIL (defaults to T), then no parens are printed
 781    around the output. ATSIGN? is ignored (but allowed so that PPRINT-LINEAR
 782    can be used with the ~/.../ format directive."
 783   (declare (ignore atsign?))
 784   (pprint-logical-block (stream list
 785                                 :prefix (if colon? "(" "")
 786                                 :suffix (if colon? ")" ""))
 787     (pprint-exit-if-list-exhausted)
 788     (loop
 789       (output-object (pprint-pop) stream)
 790       (pprint-exit-if-list-exhausted)
 791       (write-char #\space stream)
 792       (pprint-newline :linear stream))))
 793
 794 (defun pprint-tabular (stream list &optional (colon? t) atsign? tabsize)
 795   #!+sb-doc
 796   "Output LIST to STREAM tabbing to the next column that is an even multiple
 797    of TABSIZE (which defaults to 16) between each element. :FILL style
 798    conditional newlines are also output between each element. If COLON? is
 799    NIL (defaults to T), then no parens are printed around the output.
 800    ATSIGN? is ignored (but allowed so that PPRINT-TABULAR can be used with
 801    the ~/.../ format directive."
 802   (declare (ignore atsign?))
 803   (pprint-logical-block (stream list
 804                                 :prefix (if colon? "(" "")
 805                                 :suffix (if colon? ")" ""))
 806     (pprint-exit-if-list-exhausted)
 807     (loop
 808       (output-object (pprint-pop) stream)
 809       (pprint-exit-if-list-exhausted)
 810       (write-char #\space stream)
 811       (pprint-tab :section-relative 0 (or tabsize 16) stream)
 812       (pprint-newline :fill stream))))
 813 \f
 814 ;;;; pprint-dispatch tables
 815
 816 (defvar *initial-pprint-dispatch*)
 817 (defvar *building-initial-table* nil)
 818
 819 (defstruct (pprint-dispatch-entry (:copier nil))
 820   ;; the type specifier for this entry
 821   (type (missing-arg) :type t)
 822   ;; a function to test to see whether an object is of this time.
 823   ;; Pretty must just (LAMBDA (OBJ) (TYPEP OBJECT TYPE)) except that
 824   ;; we handle the CONS type specially so that (CONS (MEMBER FOO))
 825   ;; works. We don't bother computing this for entries in the CONS
 826   ;; hash table, because we don't need it.
 827   (test-fn nil :type (or function null))
 828   ;; the priority for this guy
 829   (priority 0 :type real)
 830   ;; T iff one of the original entries.
 831   (initial-p *building-initial-table* :type (member t nil))
 832   ;; and the associated function
 833   (fun (missing-arg) :type callable))
 834 (def!method print-object ((entry pprint-dispatch-entry) stream)
 835   (print-unreadable-object (entry stream :type t)
 836     (format stream "type=~S, priority=~S~@[ [initial]~]"
 837             (pprint-dispatch-entry-type entry)
 838             (pprint-dispatch-entry-priority entry)
 839             (pprint-dispatch-entry-initial-p entry))))
 840
 841 (defun cons-type-specifier-p (spec)
 842   (and (consp spec)
 843        (eq (car spec) 'cons)
 844        (cdr spec)
 845        (null (cddr spec))
 846        (let ((car (cadr spec)))
 847          (and (consp car)
 848               (let ((carcar (car car)))
 849                 (or (eq carcar 'member)
 850                     (eq carcar 'eql)))
 851               (cdr car)
 852               (null (cddr car))))))
 853
 854 (defun entry< (e1 e2)
 855   (declare (type pprint-dispatch-entry e1 e2))
 856   (if (pprint-dispatch-entry-initial-p e1)
 857       (if (pprint-dispatch-entry-initial-p e2)
 858           (< (pprint-dispatch-entry-priority e1)
 859              (pprint-dispatch-entry-priority e2))
 860           t)
 861       (if (pprint-dispatch-entry-initial-p e2)
 862           nil
 863           (< (pprint-dispatch-entry-priority e1)
 864              (pprint-dispatch-entry-priority e2)))))
 865
 866 (macrolet ((frob (name x)
 867              `(cons ',x (named-lambda ,(symbolicate "PPRINT-DISPATCH-" name) (object)
 868                             ,x))))
 869   (defvar *precompiled-pprint-dispatch-funs*
 870     (list (frob array (typep object 'array))
 871           (frob sharp-function (and (consp object)
 872                                     (symbolp (car object))
 873                                     (fboundp (car object))))
 874           (frob cons (typep object 'cons)))))
 875
 876 (defun compute-test-fn (type)
 877   (let ((was-cons nil))
 878     (labels ((compute-test-expr (type object)
 879                (if (listp type)
 880                    (case (car type)
 881                      (cons
 882                       (setq was-cons t)
 883                       (destructuring-bind
 884                           (&optional (car nil car-p) (cdr nil cdr-p))
 885                           (cdr type)
 886                         `(and (consp ,object)
 887                               ,@(when car-p
 888                                   `(,(compute-test-expr
 889                                       car `(car ,object))))
 890                               ,@(when cdr-p
 891                                   `(,(compute-test-expr
 892                                       cdr `(cdr ,object)))))))
 893                      (not
 894                       (destructuring-bind (type) (cdr type)
 895                         `(not ,(compute-test-expr type object))))
 896                      (and
 897                       `(and ,@(mapcar (lambda (type)
 898                                         (compute-test-expr type object))
 899                                       (cdr type))))
 900                      (or
 901                       `(or ,@(mapcar (lambda (type)
 902                                        (compute-test-expr type object))
 903                                      (cdr type))))
 904                      (t
 905                       `(typep ,object ',type)))
 906                    `(typep ,object ',type))))
 907       (let ((expr (compute-test-expr type 'object)))
 908         (cond ((cdr (assoc expr *precompiled-pprint-dispatch-funs*
 909                            :test #'equal)))
 910               (t
 911                (let ((name (symbolicate "PPRINT-DISPATCH-"
 912                                         (if (symbolp type)
 913                                             type
 914                                             (write-to-string type
 915                                                              :escape t
 916                                                              :pretty nil
 917                                                              :readably nil)))))
 918                  (compile nil `(named-lambda ,name (object)
 919                                  ,expr)))))))))
 920
 921 (defun copy-pprint-dispatch (&optional (table *print-pprint-dispatch*))
 922   (declare (type (or pprint-dispatch-table null) table))
 923   (let* ((orig (or table *initial-pprint-dispatch*))
 924          (new (make-pprint-dispatch-table
 925                :entries (copy-list (pprint-dispatch-table-entries orig))))
 926          (new-cons-entries (pprint-dispatch-table-cons-entries new)))
 927     (maphash (lambda (key value)
 928                (setf (gethash key new-cons-entries) value))
 929              (pprint-dispatch-table-cons-entries orig))
 930     new))
 931
 932 (defun pprint-dispatch (object &optional (table *print-pprint-dispatch*))
 933   (declare (type (or pprint-dispatch-table null) table))
 934   (let* ((table (or table *initial-pprint-dispatch*))
 935          (cons-entry
 936           (and (consp object)
 937                (gethash (car object)
 938                         (pprint-dispatch-table-cons-entries table))))
 939          (entry
 940           (dolist (entry (pprint-dispatch-table-entries table) cons-entry)
 941             (when (and cons-entry
 942                        (entry< entry cons-entry))
 943               (return cons-entry))
 944             (when (funcall (pprint-dispatch-entry-test-fn entry) object)
 945               (return entry)))))
 946     (if entry
 947         (values (pprint-dispatch-entry-fun entry) t)
 948         (values (lambda (stream object)
 949                   (output-ugly-object object stream))
 950                 nil))))
 951
 952 (defun set-pprint-dispatch (type function &optional
 953                             (priority 0) (table *print-pprint-dispatch*))
 954   (declare (type (or null callable) function)
 955            (type real priority)
 956            (type pprint-dispatch-table table))
 957   (/show0 "entering SET-PPRINT-DISPATCH, TYPE=...")
 958   (/hexstr type)
 959   (if function
 960       (if (cons-type-specifier-p type)
 961           (setf (gethash (second (second type))
 962                          (pprint-dispatch-table-cons-entries table))
 963                 (make-pprint-dispatch-entry :type type
 964                                             :priority priority
 965                                             :fun function))
 966           (let ((list (delete type (pprint-dispatch-table-entries table)
 967                               :key #'pprint-dispatch-entry-type
 968                               :test #'equal))
 969                 (entry (make-pprint-dispatch-entry
 970                         :type type
 971                         :test-fn (compute-test-fn type)
 972                         :priority priority
 973                         :fun function)))
 974             (do ((prev nil next)
 975                  (next list (cdr next)))
 976                 ((null next)
 977                  (if prev
 978                      (setf (cdr prev) (list entry))
 979                      (setf list (list entry))))
 980               (when (entry< (car next) entry)
 981                 (if prev
 982                     (setf (cdr prev) (cons entry next))
 983                     (setf list (cons entry next)))
 984                 (return)))
 985             (setf (pprint-dispatch-table-entries table) list)))
 986       (if (cons-type-specifier-p type)
 987           (remhash (second (second type))
 988                    (pprint-dispatch-table-cons-entries table))
 989           (setf (pprint-dispatch-table-entries table)
 990                 (delete type (pprint-dispatch-table-entries table)
 991                         :key #'pprint-dispatch-entry-type
 992                         :test #'equal))))
 993   (/show0 "about to return NIL from SET-PPRINT-DISPATCH")
 994   nil)
 995 \f
 996 ;;;; standard pretty-printing routines
 997
 998 (defun pprint-array (stream array)
 999   (cond ((or (and (null *print-array*) (null *print-readably*))
1000              (stringp array)
1001              (bit-vector-p array))
1002          (output-ugly-object array stream))
1003         ((and *print-readably*
1004               (not (array-readably-printable-p array)))
1005          (let ((*print-readably* nil))
1006            (error 'print-not-readable :object array)))
1007         ((vectorp array)
1008          (pprint-vector stream array))
1009         (t
1010          (pprint-multi-dim-array stream array))))
1011
1012 (defun pprint-vector (stream vector)
1013   (pprint-logical-block (stream nil :prefix "#(" :suffix ")")
1014     (dotimes (i (length vector))
1015       (unless (zerop i)
1016         (format stream " ~:_"))
1017       (pprint-pop)
1018       (output-object (aref vector i) stream))))
1019
1020 (defun pprint-multi-dim-array (stream array)
1021   (funcall (formatter "#~DA") stream (array-rank array))
1022   (with-array-data ((data array) (start) (end))
1023     (declare (ignore end))
1024     (labels ((output-guts (stream index dimensions)
1025                (if (null dimensions)
1026                    (output-object (aref data index) stream)
1027                    (pprint-logical-block
1028                        (stream nil :prefix "(" :suffix ")")
1029                      (let ((dim (car dimensions)))
1030                        (unless (zerop dim)
1031                          (let* ((dims (cdr dimensions))
1032                                 (index index)
1033                                 (step (reduce #'* dims))
1034                                 (count 0))
1035                            (loop
1036                              (pprint-pop)
1037                              (output-guts stream index dims)
1038                              (when (= (incf count) dim)
1039                                (return))
1040                              (write-char #\space stream)
1041                              (pprint-newline (if dims :linear :fill)
1042                                              stream)
1043                              (incf index step)))))))))
1044       (output-guts stream start (array-dimensions array)))))
1045
1046 (defun pprint-lambda-list (stream lambda-list &rest noise)
1047   (declare (ignore noise))
1048   (when (and (consp lambda-list)
1049              (member (car lambda-list) *backq-tokens*))
1050     ;; if this thing looks like a backquoty thing, then we don't want
1051     ;; to destructure it, we want to output it straight away.  [ this
1052     ;; is the exception to the normal processing: if we did this
1053     ;; generally we would find lambda lists such as (FUNCTION FOO)
1054     ;; being printed as #'FOO ]  -- CSR, 2003-12-07
1055     (output-object lambda-list stream)
1056     (return-from pprint-lambda-list nil))
1057   (pprint-logical-block (stream lambda-list :prefix "(" :suffix ")")
1058     (let ((state :required)
1059           (first t))
1060       (loop
1061         (pprint-exit-if-list-exhausted)
1062         (unless first
1063           (write-char #\space stream))
1064         (let ((arg (pprint-pop)))
1065           (unless first
1066             (case arg
1067               (&optional
1068                (setf state :optional)
1069                (pprint-newline :linear stream))
1070               ((&rest &body)
1071                (setf state :required)
1072                (pprint-newline :linear stream))
1073               (&key
1074                (setf state :key)
1075                (pprint-newline :linear stream))
1076               (&aux
1077                (setf state :optional)
1078                (pprint-newline :linear stream))
1079               (t
1080                (pprint-newline :fill stream))))
1081           (ecase state
1082             (:required
1083              (pprint-lambda-list stream arg))
1084             ((:optional :key)
1085              (pprint-logical-block
1086                  (stream arg :prefix "(" :suffix ")")
1087                (pprint-exit-if-list-exhausted)
1088                (if (eq state :key)
1089                    (pprint-logical-block
1090                        (stream (pprint-pop) :prefix "(" :suffix ")")
1091                      (pprint-exit-if-list-exhausted)
1092                      (output-object (pprint-pop) stream)
1093                      (pprint-exit-if-list-exhausted)
1094                      (write-char #\space stream)
1095                      (pprint-newline :fill stream)
1096                      (pprint-lambda-list stream (pprint-pop))
1097                      (loop
1098                        (pprint-exit-if-list-exhausted)
1099                        (write-char #\space stream)
1100                        (pprint-newline :fill stream)
1101                        (output-object (pprint-pop) stream)))
1102                    (pprint-lambda-list stream (pprint-pop)))
1103                (loop
1104                  (pprint-exit-if-list-exhausted)
1105                  (write-char #\space stream)
1106                  (pprint-newline :linear stream)
1107                  (output-object (pprint-pop) stream))))))
1108         (setf first nil)))))
1109
1110 (defun pprint-lambda (stream list &rest noise)
1111   (declare (ignore noise))
1112   (funcall (formatter
1113             ;; KLUDGE: This format string, and other format strings which also
1114             ;; refer to SB!PRETTY, rely on the current SBCL not-quite-ANSI
1115             ;; behavior of FORMATTER in order to make code which survives the
1116             ;; transition when SB!PRETTY is renamed to SB-PRETTY after cold
1117             ;; init. (ANSI says that the FORMATTER functions should be
1118             ;; equivalent to the format string, but the SBCL FORMATTER
1119             ;; functions contain references to package objects, not package
1120             ;; names, so they keep right on going if the packages are renamed.)
1121             ;; If our FORMATTER behavior is ever made more compliant, the code
1122             ;; here will have to change. -- WHN 19991207
1123             "~:<~^~W~^~3I ~:_~/SB!PRETTY:PPRINT-LAMBDA-LIST/~1I~@{ ~_~W~}~:>")
1124            stream
1125            list))
1126
1127 (defun pprint-block (stream list &rest noise)
1128   (declare (ignore noise))
1129   (funcall (formatter "~:<~^~W~^~3I ~:_~W~1I~@{ ~_~W~}~:>") stream list))
1130
1131 (defun pprint-flet (stream list &rest noise)
1132   (declare (ignore noise))
1133   (if (and (consp list)
1134            (consp (cdr list))
1135            (cddr list))
1136       (funcall (formatter
1137                 "~:<~^~W~^ ~@_~:<~@{~:<~^~W~^~3I ~:_~/SB!PRETTY:PPRINT-LAMBDA-LIST/~1I~:@_~@{~W~^ ~_~}~:>~^ ~_~}~:>~1I~@:_~@{~W~^ ~_~}~:>")
1138                stream
1139                list)
1140       ;; for printing function names like (flet foo)
1141       (pprint-logical-block (stream list :prefix "(" :suffix ")")
1142         (pprint-exit-if-list-exhausted)
1143         (write (pprint-pop) :stream stream)
1144         (loop
1145            (pprint-exit-if-list-exhausted)
1146            (write-char #\space stream)
1147            (write (pprint-pop) :stream stream)))))
1148
1149 (defun pprint-let (stream list &rest noise)
1150   (declare (ignore noise))
1151   (funcall (formatter "~:<~^~W~^ ~@_~:<~@{~:<~^~W~@{ ~_~W~}~:>~^ ~_~}~:>~1I~:@_~@{~W~^ ~_~}~:>")
1152            stream
1153            list))
1154
1155 (defun pprint-progn (stream list &rest noise)
1156   (declare (ignore noise))
1157   (funcall (formatter "~:<~^~W~@{ ~_~W~}~:>") stream list))
1158
1159 (defun pprint-progv (stream list &rest noise)
1160   (declare (ignore noise))
1161   (funcall (formatter "~:<~^~W~^~3I ~_~W~^ ~_~W~^~1I~@{ ~_~W~}~:>")
1162            stream list))
1163
1164 (defun pprint-quote (stream list &rest noise)
1165   (declare (ignore noise))
1166   (if (and (consp list)
1167            (consp (cdr list))
1168            (null (cddr list)))
1169       (case (car list)
1170         (function
1171          (write-string "#'" stream)
1172          (output-object (cadr list) stream))
1173         (quote
1174          (write-char #\' stream)
1175          (output-object (cadr list) stream))
1176         (t
1177          (pprint-fill stream list)))
1178       (pprint-fill stream list)))
1179
1180 (defun pprint-setq (stream list &rest noise)
1181   (declare (ignore noise))
1182   (pprint-logical-block (stream list :prefix "(" :suffix ")")
1183     (pprint-exit-if-list-exhausted)
1184     (output-object (pprint-pop) stream)
1185     (pprint-exit-if-list-exhausted)
1186     (write-char #\space stream)
1187     (pprint-newline :miser stream)
1188     (if (and (consp (cdr list)) (consp (cddr list)))
1189         (loop
1190           (pprint-indent :current 2 stream)
1191           (output-object (pprint-pop) stream)
1192           (pprint-exit-if-list-exhausted)
1193           (write-char #\space stream)
1194           (pprint-newline :linear stream)
1195           (pprint-indent :current -2 stream)
1196           (output-object (pprint-pop) stream)
1197           (pprint-exit-if-list-exhausted)
1198           (write-char #\space stream)
1199           (pprint-newline :linear stream))
1200         (progn
1201           (pprint-indent :current 0 stream)
1202           (output-object (pprint-pop) stream)
1203           (pprint-exit-if-list-exhausted)
1204           (write-char #\space stream)
1205           (pprint-newline :linear stream)
1206           (output-object (pprint-pop) stream)))))
1207
1208 ;;; FIXME: could become SB!XC:DEFMACRO wrapped in EVAL-WHEN (COMPILE EVAL)
1209 (defmacro pprint-tagbody-guts (stream)
1210   `(loop
1211      (pprint-exit-if-list-exhausted)
1212      (write-char #\space ,stream)
1213      (let ((form-or-tag (pprint-pop)))
1214        (pprint-indent :block
1215                       (if (atom form-or-tag) 0 1)
1216                       ,stream)
1217        (pprint-newline :linear ,stream)
1218        (output-object form-or-tag ,stream))))
1219
1220 (defun pprint-tagbody (stream list &rest noise)
1221   (declare (ignore noise))
1222   (pprint-logical-block (stream list :prefix "(" :suffix ")")
1223     (pprint-exit-if-list-exhausted)
1224     (output-object (pprint-pop) stream)
1225     (pprint-tagbody-guts stream)))
1226
1227 (defun pprint-case (stream list &rest noise)
1228   (declare (ignore noise))
1229   (funcall (formatter
1230             "~:<~^~W~^ ~3I~:_~W~1I~@{ ~_~:<~^~:/SB!PRETTY:PPRINT-FILL/~^~@{ ~_~W~}~:>~}~:>")
1231            stream
1232            list))
1233
1234 (defun pprint-defun (stream list &rest noise)
1235   (declare (ignore noise))
1236   (funcall (formatter
1237             "~:<~^~W~^ ~@_~:I~W~^ ~:_~/SB!PRETTY:PPRINT-LAMBDA-LIST/~1I~@{ ~_~W~}~:>")
1238            stream
1239            list))
1240
1241 (defun pprint-destructuring-bind (stream list &rest noise)
1242   (declare (ignore noise))
1243   (funcall (formatter
1244             "~:<~^~W~^~3I ~_~:/SB!PRETTY:PPRINT-LAMBDA-LIST/~^ ~_~W~^~1I~@{ ~_~W~}~:>")
1245            stream list))
1246
1247 (defun pprint-do (stream list &rest noise)
1248   (declare (ignore noise))
1249   (pprint-logical-block (stream list :prefix "(" :suffix ")")
1250     (pprint-exit-if-list-exhausted)
1251     (output-object (pprint-pop) stream)
1252     (pprint-exit-if-list-exhausted)
1253     (write-char #\space stream)
1254     (pprint-indent :current 0 stream)
1255     (funcall (formatter "~:<~@{~:<~^~W~^ ~@_~:I~W~@{ ~_~W~}~:>~^~:@_~}~:>")
1256              stream
1257              (pprint-pop))
1258     (pprint-exit-if-list-exhausted)
1259     (write-char #\space stream)
1260     (pprint-newline :linear stream)
1261     (pprint-linear stream (pprint-pop))
1262     (pprint-tagbody-guts stream)))
1263
1264 (defun pprint-dolist (stream list &rest noise)
1265   (declare (ignore noise))
1266   (pprint-logical-block (stream list :prefix "(" :suffix ")")
1267     (pprint-exit-if-list-exhausted)
1268     (output-object (pprint-pop) stream)
1269     (pprint-exit-if-list-exhausted)
1270     (pprint-indent :block 3 stream)
1271     (write-char #\space stream)
1272     (pprint-newline :fill stream)
1273     (funcall (formatter "~:<~^~W~^ ~:_~:I~W~@{ ~_~W~}~:>")
1274              stream
1275              (pprint-pop))
1276     (pprint-tagbody-guts stream)))
1277
1278 (defun pprint-typecase (stream list &rest noise)
1279   (declare (ignore noise))
1280   (funcall (formatter
1281             "~:<~^~W~^ ~3I~:_~W~1I~@{ ~_~:<~^~W~^~@{ ~_~W~}~:>~}~:>")
1282            stream
1283            list))
1284
1285 (defun pprint-prog (stream list &rest noise)
1286   (declare (ignore noise))
1287   (pprint-logical-block (stream list :prefix "(" :suffix ")")
1288     (pprint-exit-if-list-exhausted)
1289     (output-object (pprint-pop) stream)
1290     (pprint-exit-if-list-exhausted)
1291     (write-char #\space stream)
1292     (pprint-newline :miser stream)
1293     (pprint-fill stream (pprint-pop))
1294     (pprint-tagbody-guts stream)))
1295
1296 (defun pprint-fun-call (stream list &rest noise)
1297   (declare (ignore noise))
1298   (funcall (formatter "~:<~^~W~^ ~:_~:I~@{~W~^ ~:_~}~:>")
1299            stream
1300            list))
1301
1302 (defun pprint-data-list (stream list &rest noise)
1303   (declare (ignore noise))
1304   (funcall (formatter "~:<~@{~W~^ ~:_~}~:>") stream list))
1305 \f
1306 ;;;; the interface seen by regular (ugly) printer and initialization routines
1307
1308 ;;; OUTPUT-PRETTY-OBJECT is called by OUTPUT-OBJECT when
1309 ;;; *PRINT-PRETTY* is true.
1310 (defun output-pretty-object (object stream)
1311   (with-pretty-stream (stream)
1312     (funcall (pprint-dispatch object) stream object)))
1313
1314 (defun !pprint-cold-init ()
1315   (/show0 "entering !PPRINT-COLD-INIT")
1316   (setf *initial-pprint-dispatch* (make-pprint-dispatch-table))
1317   (let ((*print-pprint-dispatch* *initial-pprint-dispatch*)
1318         (*building-initial-table* t))
1319     ;; printers for regular types
1320     (/show0 "doing SET-PPRINT-DISPATCH for regular types")
1321     (set-pprint-dispatch 'array #'pprint-array)
1322     (set-pprint-dispatch '(cons (and symbol (satisfies fboundp)))
1323                          #'pprint-fun-call -1)
1324     (set-pprint-dispatch '(cons symbol)
1325                          #'pprint-data-list -2)
1326     (set-pprint-dispatch 'cons #'pprint-fill -2)
1327     ;; cons cells with interesting things for the car
1328     (/show0 "doing SET-PPRINT-DISPATCH for CONS with interesting CAR")
1329
1330     (dolist (magic-form '((lambda pprint-lambda)
1331
1332                           ;; special forms
1333                           (block pprint-block)
1334                           (catch pprint-block)
1335                           (eval-when pprint-block)
1336                           (flet pprint-flet)
1337                           (function pprint-quote)
1338                           (labels pprint-flet)
1339                           (let pprint-let)
1340                           (let* pprint-let)
1341                           (locally pprint-progn)
1342                           (macrolet pprint-flet)
1343                           (multiple-value-call pprint-block)
1344                           (multiple-value-prog1 pprint-block)
1345                           (progn pprint-progn)
1346                           (progv pprint-progv)
1347                           (quote pprint-quote)
1348                           (return-from pprint-block)
1349                           (setq pprint-setq)
1350                           (symbol-macrolet pprint-let)
1351                           (tagbody pprint-tagbody)
1352                           (throw pprint-block)
1353                           (unwind-protect pprint-block)
1354
1355                           ;; macros
1356                           (case pprint-case)
1357                           (ccase pprint-case)
1358                           (ctypecase pprint-typecase)
1359                           (defconstant pprint-block)
1360                           (define-modify-macro pprint-defun)
1361                           (define-setf-expander pprint-defun)
1362                           (defmacro pprint-defun)
1363                           (defparameter pprint-block)
1364                           (defsetf pprint-defun)
1365                           (defstruct pprint-block)
1366                           (deftype pprint-defun)
1367                           (defun pprint-defun)
1368                           (defvar pprint-block)
1369                           (destructuring-bind pprint-destructuring-bind)
1370                           (do pprint-do)
1371                           (do* pprint-do)
1372                           (do-all-symbols pprint-dolist)
1373                           (do-external-symbols pprint-dolist)
1374                           (do-symbols pprint-dolist)
1375                           (dolist pprint-dolist)
1376                           (dotimes pprint-dolist)
1377                           (ecase pprint-case)
1378                           (etypecase pprint-typecase)
1379                           #+nil (handler-bind ...)
1380                           #+nil (handler-case ...)
1381                           #+nil (loop ...)
1382                           (multiple-value-bind pprint-progv)
1383                           (multiple-value-setq pprint-block)
1384                           (pprint-logical-block pprint-block)
1385                           (print-unreadable-object pprint-block)
1386                           (prog pprint-prog)
1387                           (prog* pprint-prog)
1388                           (prog1 pprint-block)
1389                           (prog2 pprint-progv)
1390                           (psetf pprint-setq)
1391                           (psetq pprint-setq)
1392                           #+nil (restart-bind ...)
1393                           #+nil (restart-case ...)
1394                           (setf pprint-setq)
1395                           (step pprint-progn)
1396                           (time pprint-progn)
1397                           (typecase pprint-typecase)
1398                           (unless pprint-block)
1399                           (when pprint-block)
1400                           (with-compilation-unit pprint-block)
1401                           #+nil (with-condition-restarts ...)
1402                           (with-hash-table-iterator pprint-block)
1403                           (with-input-from-string pprint-block)
1404                           (with-open-file pprint-block)
1405                           (with-open-stream pprint-block)
1406                           (with-output-to-string pprint-block)
1407                           (with-package-iterator pprint-block)
1408                           (with-simple-restart pprint-block)
1409                           (with-standard-io-syntax pprint-progn)))
1410
1411       (set-pprint-dispatch `(cons (eql ,(first magic-form)))
1412                            (symbol-function (second magic-form))))
1413
1414     ;; other pretty-print init forms
1415     (/show0 "about to call !BACKQ-PP-COLD-INIT")
1416     (sb!impl::!backq-pp-cold-init)
1417     (/show0 "leaving !PPRINT-COLD-INIT"))
1418
1419   (setf *print-pprint-dispatch* (copy-pprint-dispatch nil))
1420   (setf *print-pretty* t))