3 ;;;; This software is part of the SBCL system. See the README file for
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.
12 (in-package "SB!IMPL")
17 ;;;; exported printer control variables
19 ;;; FIXME: Many of these have nontrivial types, e.g. *PRINT-LEVEL*,
20 ;;; *PRINT-LENGTH*, and *PRINT-LINES* are (OR NULL UNSIGNED-BYTE).
22 (defvar *print-readably* nil
24 "If true, all objects will printed readably. If readable printing is
25 impossible, an error will be signalled. This overrides the value of
27 (defvar *print-escape* T
29 "Flag which indicates that slashification is on. See the manual")
30 (defvar *print-pretty* nil ; (set later when pretty-printer is initialized)
32 "Flag which indicates that pretty printing is to be used")
33 (defvar *print-base* 10.
35 "The output base for integers and rationals.")
36 (defvar *print-radix* nil
38 "This flag requests to verify base when printing rationals.")
39 (defvar *print-level* nil
41 "How many levels deep to print. Unlimited if null.")
42 (defvar *print-length* nil
44 "How many elements to print on each level. Unlimited if null.")
45 (defvar *print-circle* nil
47 "Whether to worry about circular list structures. See the manual.")
48 (defvar *print-case* :upcase
50 "What kind of case the printer should use by default")
51 (defvar *print-array* t
53 "Whether the array should print its guts out")
54 (defvar *print-gensym* t
56 "If true, symbols with no home package are printed with a #: prefix.
57 If false, no prefix is printed.")
58 (defvar *print-lines* nil
60 "The maximum number of lines to print. If NIL, unlimited.")
61 (defvar *print-right-margin* nil
63 "The position of the right margin in ems. If NIL, try to determine this
64 from the stream in use.")
65 (defvar *print-miser-width* nil
67 "If the remaining space between the current column and the right margin
68 is less than this, then print using ``miser-style'' output. Miser
69 style conditional newlines are turned on, and all indentations are
70 turned off. If NIL, never use miser mode.")
71 (defvar *print-pprint-dispatch* nil
73 "The pprint-dispatch-table that controls how to pretty print objects. See
74 COPY-PPRINT-DISPATH, PPRINT-DISPATCH, and SET-PPRINT-DISPATCH.")
76 (defmacro with-standard-io-syntax (&body body)
78 "Bind the reader and printer control variables to values that enable READ
79 to reliably read the results of PRINT. These values are:
80 *PACKAGE* the COMMON-LISP-USER package
90 *PRINT-MISER-WIDTH* NIL
94 *PRINT-RIGHT-MARGIN* NIL
96 *READ-DEFAULT-FLOAT-FORMAT* SINGLE-FLOAT
99 *READTABLE* the standard readtable."
100 `(%with-standard-io-syntax #'(lambda () ,@body)))
102 (defun %with-standard-io-syntax (function)
103 (let ((*package* (find-package "COMMON-LISP-USER"))
106 (*print-case* :upcase)
113 (*print-miser-width* nil)
117 (*print-right-margin* nil)
119 (*read-default-float-format* 'single-float)
121 (*read-suppress* nil)
122 ;; FIXME: It doesn't seem like a good idea to expose our
123 ;; disaster-recovery *STANDARD-READTABLE* here. Perhaps we
124 ;; should do a COPY-READTABLE? The consing would be unfortunate,
126 (*readtable* *standard-readtable*))
129 ;;;; routines to print objects
131 (defun write (object &key
132 ((:stream stream) *standard-output*)
133 ((:escape *print-escape*) *print-escape*)
134 ((:radix *print-radix*) *print-radix*)
135 ((:base *print-base*) *print-base*)
136 ((:circle *print-circle*) *print-circle*)
137 ((:pretty *print-pretty*) *print-pretty*)
138 ((:level *print-level*) *print-level*)
139 ((:length *print-length*) *print-length*)
140 ((:case *print-case*) *print-case*)
141 ((:array *print-array*) *print-array*)
142 ((:gensym *print-gensym*) *print-gensym*)
143 ((:readably *print-readably*) *print-readably*)
144 ((:right-margin *print-right-margin*)
145 *print-right-margin*)
146 ((:miser-width *print-miser-width*)
148 ((:lines *print-lines*) *print-lines*)
149 ((:pprint-dispatch *print-pprint-dispatch*)
150 *print-pprint-dispatch*))
152 "Outputs OBJECT to the specified stream, defaulting to *STANDARD-OUTPUT*"
153 (output-object object (out-synonym-of stream))
156 (defun prin1 (object &optional stream)
158 "Outputs a mostly READable printed representation of OBJECT on the specified
160 (let ((*print-escape* T))
161 (output-object object (out-synonym-of stream)))
164 (defun princ (object &optional stream)
166 "Outputs an aesthetic but not necessarily READable printed representation
167 of OBJECT on the specified STREAM."
168 (let ((*print-escape* NIL)
169 (*print-readably* NIL))
170 (output-object object (out-synonym-of stream)))
173 (defun print (object &optional stream)
175 "Outputs a terpri, the mostly READable printed represenation of OBJECT, and
176 space to the specified STREAM."
177 (let ((stream (out-synonym-of stream)))
179 (prin1 object stream)
180 (write-char #\space stream)
183 (defun pprint (object &optional stream)
185 "Prettily outputs OBJECT preceded by a newline."
186 (let ((*print-pretty* t)
188 (stream (out-synonym-of stream)))
190 (output-object object stream))
193 (defun write-to-string
195 ((:escape *print-escape*) *print-escape*)
196 ((:radix *print-radix*) *print-radix*)
197 ((:base *print-base*) *print-base*)
198 ((:circle *print-circle*) *print-circle*)
199 ((:pretty *print-pretty*) *print-pretty*)
200 ((:level *print-level*) *print-level*)
201 ((:length *print-length*) *print-length*)
202 ((:case *print-case*) *print-case*)
203 ((:array *print-array*) *print-array*)
204 ((:gensym *print-gensym*) *print-gensym*)
205 ((:readably *print-readably*) *print-readably*)
206 ((:right-margin *print-right-margin*) *print-right-margin*)
207 ((:miser-width *print-miser-width*) *print-miser-width*)
208 ((:lines *print-lines*) *print-lines*)
209 ((:pprint-dispatch *print-pprint-dispatch*)
210 *print-pprint-dispatch*))
212 "Returns the printed representation of OBJECT as a string."
213 (stringify-object object))
215 (defun prin1-to-string (object)
217 "Returns the printed representation of OBJECT as a string with
219 (stringify-object object t))
221 (defun princ-to-string (object)
223 "Returns the printed representation of OBJECT as a string with
225 (stringify-object object nil))
227 ;;; This produces the printed representation of an object as a string. The
228 ;;; few ...-TO-STRING functions above call this.
229 (defvar *string-output-streams* ())
230 (defun stringify-object (object &optional (*print-escape* *print-escape*))
231 (let ((stream (if *string-output-streams*
232 (pop *string-output-streams*)
233 (make-string-output-stream))))
234 (setup-printer-state)
235 (output-object object stream)
237 (get-output-stream-string stream)
238 (push stream *string-output-streams*))))
240 ;;;; support for the PRINT-UNREADABLE-OBJECT macro
242 (defun %print-unreadable-object (object stream type identity body)
243 (when *print-readably*
244 (error 'print-not-readable :object object))
245 (write-string "#<" stream)
247 (write (type-of object) :stream stream :circle nil
248 :level nil :length nil)
249 (write-char #\space stream))
253 (unless (and type (null body))
254 (write-char #\space stream))
255 (write-char #\{ stream)
256 (write (get-lisp-obj-address object) :stream stream
258 (write-char #\} stream))
259 (write-char #\> stream)
262 ;;;; WHITESPACE-CHAR-P
264 ;;; This is used in other files, but is defined in this one for some reason.
266 (defun whitespace-char-p (char)
268 "Determines whether or not the character is considered whitespace."
269 (or (char= char #\space)
270 (char= char (code-char tab-char-code))
271 (char= char (code-char return-char-code))
272 (char= char #\linefeed)))
274 ;;;; circularity detection stuff
276 ;;; When *PRINT-CIRCLE* is T, this gets bound to a hash table that (eventually)
277 ;;; ends up with entries for every object printed. When we are initially
278 ;;; looking for circularities, we enter a T when we find an object for the
279 ;;; first time, and a 0 when we encounter an object a second time around.
280 ;;; When we are actually printing, the 0 entries get changed to the actual
281 ;;; marker value when they are first printed.
282 (defvar *circularity-hash-table* nil)
284 ;;; When NIL, we are just looking for circularities. After we have found them
285 ;;; all, this gets bound to 0. Then whenever we need a new marker, it is
287 (defvar *circularity-counter* nil)
289 (defun check-for-circularity (object &optional assign)
291 "Check to see whether OBJECT is a circular reference, and return something
292 non-NIL if it is. If ASSIGN is T, then the number to use in the #n= and
293 #n# noise is assigned at this time. Note: CHECK-FOR-CIRCULARITY must
294 be called *EXACTLY* once with ASSIGN T, or the circularity detection noise
295 will get confused about when to use #n= and when to use #n#. If this
296 returns non-NIL when ASSIGN is T, then you must call HANDLE-CIRCULARITY
297 on it. If you are not using this inside a WITH-CIRCULARITY-DETECTION,
298 then you have to be prepared to handle a return value of :INITIATE which
299 means it needs to initiate the circularity detection noise. See the
300 source for info on how to do that."
301 (cond ((null *print-circle*)
302 ;; Don't bother, nobody cares.
304 ((null *circularity-hash-table*)
306 ((null *circularity-counter*)
307 (ecase (gethash object *circularity-hash-table*)
310 (setf (gethash object *circularity-hash-table*) t)
311 ;; We need to keep looking.
315 (setf (gethash object *circularity-hash-table*) 0)
316 ;; It's a circular reference.
319 ;; It's a circular reference.
322 (let ((value (gethash object *circularity-hash-table*)))
325 ;; If NIL, we found an object that wasn't there the first time
326 ;; around. If T, exactly one occurance of this object appears.
327 ;; Either way, just print the thing without any special
328 ;; processing. Note: you might argue that finding a new object
329 ;; means that something is broken, but this can happen. If
330 ;; someone uses the ~@<...~:> format directive, it conses a
331 ;; new list each time though format (i.e. the &REST list), so
332 ;; we will have different cdrs.
336 (let ((value (incf *circularity-counter*)))
337 ;; First occurance of this object. Set the counter.
338 (setf (gethash object *circularity-hash-table*) value)
342 ;; Second or later occurance.
345 (defun handle-circularity (marker stream)
347 "Handle the results of CHECK-FOR-CIRCULARITY. If this returns T then
348 you should go ahead and print the object. If it returns NIL, then
349 you should blow it off."
352 ;; Someone forgot to initiate circularity detection.
353 (let ((*print-circle* nil))
354 (error "trying to use CHECK-FOR-CIRCULARITY when ~
355 circularity checking isn't initiated")))
357 ;; It's a second (or later) reference to the object while we are
358 ;; just looking. So don't bother groveling it again.
361 (write-char #\# stream)
362 (let ((*print-base* 10) (*print-radix* nil))
363 (cond ((minusp marker)
364 (output-integer (- marker) stream)
365 (write-char #\# stream)
368 (output-integer marker stream)
369 (write-char #\= stream)
372 ;;;; OUTPUT-OBJECT -- the main entry point
374 (defvar *pretty-printer* nil
376 "The current pretty printer. Should be either a function that takes two
377 arguments (the object and the stream) or NIL to indicate that there is
378 no pretty printer installed.")
380 (defun output-object (object stream)
382 "Output OBJECT to STREAM observing all printer control variables."
383 (labels ((print-it (stream)
386 (funcall *pretty-printer* object stream)
387 (let ((*print-pretty* nil))
388 (output-ugly-object object stream)))
389 (output-ugly-object object stream)))
391 (let ((marker (check-for-circularity object t)))
394 (let ((*circularity-hash-table*
395 (make-hash-table :test 'eq)))
396 (check-it (make-broadcast-stream))
397 (let ((*circularity-counter* 0))
402 (when (handle-circularity marker stream)
403 (print-it stream)))))))
404 (cond ((or (not *print-circle*)
407 (and (symbolp object) (symbol-package object) t))
408 ;; If it a number, character, or interned symbol, we do not want
409 ;; to check for circularity/sharing.
411 ((or *circularity-hash-table*
413 (typep object 'instance)
414 (typep object '(array t *)))
415 ;; If we have already started circularity detection, this object
416 ;; might be a sharded reference. If we have not, then if it is
417 ;; a cons, a instance, or an array of element type t it might
418 ;; contain a circular reference to itself or multiple shared
422 (print-it stream)))))
424 (defun output-ugly-object (object stream)
426 "Output OBJECT to STREAM observing all printer control variables except
427 for *PRINT-PRETTY*. Note: if *PRINT-PRETTY* is non-NIL, then the pretty
428 printer will be used for any components of OBJECT, just not for OBJECT
431 ;; KLUDGE: The TYPECASE approach here is non-ANSI; the ANSI definition of
432 ;; PRINT-OBJECT says it provides printing and we're supposed to provide
433 ;; PRINT-OBJECT methods covering all classes. We deviate from this
434 ;; by using PRINT-OBJECT only when we print instance values. However,
435 ;; ANSI makes it hard to tell that we're deviating from this:
436 ;; (1) ANSI specifies that the user isn't supposed to call PRINT-OBJECT
438 ;; (2) ANSI (section 11.1.2.1.2) says it's undefined to define
439 ;; a method on an external symbol in the CL package which is
440 ;; applicable to arg lists containing only direct instances of
441 ;; standardized classes.
442 ;; Thus, in order for the user to detect our sleaziness, he has to do
443 ;; something relatively obscure like
444 ;; (1) actually use tools like FIND-METHOD to look for PRINT-OBJECT
446 ;; (2) define a PRINT-OBJECT method which is specialized on the stream
447 ;; value (e.g. a Gray stream object).
448 ;; As long as no one comes up with a non-obscure way of detecting this
449 ;; sleaziness, fixing this nonconformity will probably have a low
450 ;; priority. -- WHN 20000121
452 (output-integer object stream))
455 (output-symbol object stream)
456 (output-list object stream)))
458 (print-object object stream))
460 (unless (and (funcallable-instance-p object)
461 (printed-as-funcallable-standard-class object stream))
462 (output-function object stream)))
464 (output-symbol object stream))
468 (output-integer object stream))
470 (output-float object stream))
472 (output-ratio object stream))
474 (output-ratio object stream))
476 (output-complex object stream))))
478 (output-character object stream))
480 (output-vector object stream))
482 (output-array object stream))
484 (output-sap object stream))
486 (output-weak-pointer object stream))
488 (output-lra object stream))
490 (output-code-component object stream))
492 (output-fdefn object stream))
494 (output-random object stream))))
498 ;;; Values of *PRINT-CASE* and (READTABLE-CASE *READTABLE*) the last time the
499 ;;; printer was called.
500 (defvar *previous-case* nil)
501 (defvar *previous-readtable-case* nil)
503 ;;; This variable contains the current definition of one of three symbol
504 ;;; printers. SETUP-PRINTER-STATE sets this variable.
505 (defvar *internal-symbol-output-function* nil)
507 ;;; This function sets the internal global symbol
508 ;;; *INTERNAL-SYMBOL-OUTPUT-FUNCTION* to the right function depending
509 ;;; on the value of *PRINT-CASE*. See the manual for details. The
510 ;;; print buffer stream is also reset.
511 (defun setup-printer-state ()
512 (unless (and (eq *print-case* *previous-case*)
513 (eq (readtable-case *readtable*) *previous-readtable-case*))
514 (setq *previous-case* *print-case*)
515 (setq *previous-readtable-case* (readtable-case *readtable*))
516 (unless (member *print-case* '(:upcase :downcase :capitalize))
517 (setq *print-case* :upcase)
518 (error "invalid *PRINT-CASE* value: ~S" *previous-case*))
519 (unless (member *previous-readtable-case*
520 '(:upcase :downcase :invert :preserve))
521 (setf (readtable-case *readtable*) :upcase)
522 (error "invalid READTABLE-CASE value: ~S" *previous-readtable-case*))
524 (setq *internal-symbol-output-function*
525 (case *previous-readtable-case*
528 (:upcase #'output-preserve-symbol)
529 (:downcase #'output-lowercase-symbol)
530 (:capitalize #'output-capitalize-symbol)))
533 (:upcase #'output-uppercase-symbol)
534 (:downcase #'output-preserve-symbol)
535 (:capitalize #'output-capitalize-symbol)))
536 (:preserve #'output-preserve-symbol)
537 (:invert #'output-invert-symbol)))))
539 ;;; Output PNAME (a symbol-name or package-name) surrounded with |'s,
540 ;;; and with any embedded |'s or \'s escaped.
541 (defun output-quoted-symbol-name (pname stream)
542 (write-char #\| stream)
543 (dotimes (index (length pname))
544 (let ((char (schar pname index)))
545 (when (or (char= char #\\) (char= char #\|))
546 (write-char #\\ stream))
547 (write-char char stream)))
548 (write-char #\| stream))
550 (defun output-symbol (object stream)
551 (if (or *print-escape* *print-readably*)
552 (let ((package (symbol-package object))
553 (name (symbol-name object)))
555 ;; The ANSI spec "22.1.3.3.1 Package Prefixes for Symbols"
556 ;; requires that keywords be printed with preceding colons
557 ;; always, regardless of the value of *PACKAGE*.
558 ((eq package *keyword-package*)
559 (write-char #\: stream))
560 ;; Otherwise, if the symbol's home package is the current
561 ;; one, then a prefix is never necessary.
562 ((eq package *package*))
563 ;; Uninterned symbols print with a leading #:.
565 (when (or *print-gensym* *print-readably*)
566 (write-string "#:" stream)))
568 (multiple-value-bind (symbol accessible) (find-symbol name *package*)
569 ;; If we can find the symbol by looking it up, it need not
570 ;; be qualified. This can happen if the symbol has been
571 ;; inherited from a package other than its home package.
572 (unless (and accessible (eq symbol object))
573 (output-symbol-name (package-name package) stream)
574 (multiple-value-bind (symbol externalp)
575 (find-external-symbol name package)
576 (declare (ignore symbol))
578 (write-char #\: stream)
579 (write-string "::" stream)))))))
580 (output-symbol-name name stream))
581 (output-symbol-name (symbol-name object) stream nil)))
583 ;;; Output the string NAME as if it were a symbol name. In other words,
584 ;;; diddle its case according to *PRINT-CASE* and READTABLE-CASE.
585 (defun output-symbol-name (name stream &optional (maybe-quote t))
586 (declare (type simple-base-string name))
587 (setup-printer-state)
588 (if (and maybe-quote (symbol-quotep name))
589 (output-quoted-symbol-name name stream)
590 (funcall *internal-symbol-output-function* name stream)))
592 ;;;; escaping symbols
594 ;;; When we print symbols we have to figure out if they need to be
595 ;;; printed with escape characters. This isn't a whole lot easier than
596 ;;; reading symbols in the first place.
598 ;;; For each character, the value of the corresponding element is a
599 ;;; fixnum with bits set corresponding to attributes that the
600 ;;; character has. At characters have at least one bit set, so we can
601 ;;; search for any character with a positive test.
602 (defvar *character-attributes*
603 (make-array char-code-limit :element-type '(unsigned-byte 16)
605 (declaim (type (simple-array (unsigned-byte 16) (#.char-code-limit))
606 *character-attributes*))
608 (eval-when (:compile-toplevel :load-toplevel :execute)
610 ;;; Constants which are a bit-mask for each interesting character attribute.
611 (defconstant other-attribute (ash 1 0)) ; Anything else legal.
612 (defconstant number-attribute (ash 1 1)) ; A numeric digit.
613 (defconstant uppercase-attribute (ash 1 2)) ; An uppercase letter.
614 (defconstant lowercase-attribute (ash 1 3)) ; A lowercase letter.
615 (defconstant sign-attribute (ash 1 4)) ; +-
616 (defconstant extension-attribute (ash 1 5)) ; ^_
617 (defconstant dot-attribute (ash 1 6)) ; .
618 (defconstant slash-attribute (ash 1 7)) ; /
619 (defconstant funny-attribute (ash 1 8)) ; Anything illegal.
621 ;;; LETTER-ATTRIBUTE is a local of SYMBOL-QUOTEP. It matches letters that
622 ;;; don't need to be escaped (according to READTABLE-CASE.)
623 (defconstant attribute-names
624 `((number . number-attribute) (lowercase . lowercase-attribute)
625 (uppercase . uppercase-attribute) (letter . letter-attribute)
626 (sign . sign-attribute) (extension . extension-attribute)
627 (dot . dot-attribute) (slash . slash-attribute)
628 (other . other-attribute) (funny . funny-attribute)))
632 (flet ((set-bit (char bit)
633 (let ((code (char-code char)))
634 (setf (aref *character-attributes* code)
635 (logior bit (aref *character-attributes* code))))))
637 (dolist (char '(#\! #\@ #\$ #\% #\& #\* #\= #\~ #\[ #\] #\{ #\}
639 (set-bit char other-attribute))
642 (set-bit (digit-char i) number-attribute))
644 (do ((code (char-code #\A) (1+ code))
645 (end (char-code #\Z)))
647 (declare (fixnum code end))
648 (set-bit (code-char code) uppercase-attribute)
649 (set-bit (char-downcase (code-char code)) lowercase-attribute))
651 (set-bit #\- sign-attribute)
652 (set-bit #\+ sign-attribute)
653 (set-bit #\^ extension-attribute)
654 (set-bit #\_ extension-attribute)
655 (set-bit #\. dot-attribute)
656 (set-bit #\/ slash-attribute)
658 ;; Mark anything not explicitly allowed as funny.
659 (dotimes (i char-code-limit)
660 (when (zerop (aref *character-attributes* i))
661 (setf (aref *character-attributes* i) funny-attribute))))
663 ;;; For each character, the value of the corresponding element is the lowest
664 ;;; base in which that character is a digit.
665 (defvar *digit-bases*
666 (make-array char-code-limit
667 :element-type '(unsigned-byte 8)
668 :initial-element 36))
669 (declaim (type (simple-array (unsigned-byte 8) (#.char-code-limit))
673 (let ((char (digit-char i 36)))
674 (setf (aref *digit-bases* (char-code char)) i)))
676 ;;; A FSM-like thingie that determines whether a symbol is a potential
677 ;;; number or has evil characters in it.
678 (defun symbol-quotep (name)
679 (declare (simple-string name))
680 (macrolet ((advance (tag &optional (at-end t))
683 ,(if at-end '(go TEST-SIGN) '(return nil)))
684 (setq current (schar name index)
685 code (char-code current)
686 bits (aref attributes code))
689 (test (&rest attributes)
695 (or (cdr (assoc x attribute-names))
700 `(< (the fixnum (aref bases code)) base)))
702 (prog ((len (length name))
703 (attributes *character-attributes*)
704 (bases *digit-bases*)
707 (case (readtable-case *readtable*)
708 (:upcase uppercase-attribute)
709 (:downcase lowercase-attribute)
710 (t (logior lowercase-attribute uppercase-attribute))))
715 (declare (fixnum len base index bits code))
718 TEST-SIGN ; At end, see whether it is a sign...
719 (return (not (test sign)))
721 OTHER ; Not potential number, see whether funny chars...
722 (let ((mask (logxor (logior lowercase-attribute uppercase-attribute
725 (do ((i (1- index) (1+ i)))
726 ((= i len) (return-from symbol-quotep nil))
727 (unless (zerop (logand (aref attributes (char-code (schar name i)))
729 (return-from symbol-quotep t))))
734 (advance LAST-DIGIT-ALPHA)
736 (when (test letter number other slash) (advance OTHER nil))
737 (when (char= current #\.) (advance DOT-FOUND))
738 (when (test sign extension) (advance START-STUFF nil))
741 DOT-FOUND ; Leading dots...
742 (when (test letter) (advance START-DOT-MARKER nil))
743 (when (digitp) (advance DOT-DIGIT))
744 (when (test number other) (advance OTHER nil))
745 (when (test extension slash sign) (advance START-DOT-STUFF nil))
746 (when (char= current #\.) (advance DOT-FOUND))
749 START-STUFF ; Leading stuff before any dot or digit.
752 (advance LAST-DIGIT-ALPHA)
754 (when (test number other) (advance OTHER nil))
755 (when (test letter) (advance START-MARKER nil))
756 (when (char= current #\.) (advance START-DOT-STUFF nil))
757 (when (test sign extension slash) (advance START-STUFF nil))
760 START-MARKER ; Number marker in leading stuff...
761 (when (test letter) (advance OTHER nil))
764 START-DOT-STUFF ; Leading stuff containing dot w/o digit...
765 (when (test letter) (advance START-DOT-STUFF nil))
766 (when (digitp) (advance DOT-DIGIT))
767 (when (test sign extension dot slash) (advance START-DOT-STUFF nil))
768 (when (test number other) (advance OTHER nil))
771 START-DOT-MARKER ; Number marker in leading stuff w/ dot..
772 ;; Leading stuff containing dot w/o digit followed by letter...
773 (when (test letter) (advance OTHER nil))
776 DOT-DIGIT ; In a thing with dots...
777 (when (test letter) (advance DOT-MARKER))
778 (when (digitp) (advance DOT-DIGIT))
779 (when (test number other) (advance OTHER nil))
780 (when (test sign extension dot slash) (advance DOT-DIGIT))
783 DOT-MARKER ; Number maker in number with dot...
784 (when (test letter) (advance OTHER nil))
787 LAST-DIGIT-ALPHA ; Previous char is a letter digit...
788 (when (or (digitp) (test sign slash))
789 (advance ALPHA-DIGIT))
790 (when (test letter number other dot) (advance OTHER nil))
793 ALPHA-DIGIT ; Seen a digit which is a letter...
794 (when (or (digitp) (test sign slash))
796 (advance LAST-DIGIT-ALPHA)
797 (advance ALPHA-DIGIT)))
798 (when (test letter) (advance ALPHA-MARKER))
799 (when (test number other dot) (advance OTHER nil))
802 ALPHA-MARKER ; Number marker in number with alpha digit...
803 (when (test letter) (advance OTHER nil))
806 DIGIT ; Seen only real numeric digits...
809 (advance ALPHA-DIGIT)
811 (when (test number other) (advance OTHER nil))
812 (when (test letter) (advance MARKER))
813 (when (test extension slash sign) (advance DIGIT))
814 (when (char= current #\.) (advance DOT-DIGIT))
817 MARKER ; Number marker in a numeric number...
818 (when (test letter) (advance OTHER nil))
821 ;;;; *INTERNAL-SYMBOL-OUTPUT-FUNCTION*
823 ;;;; Case hackery. These functions are stored in
824 ;;;; *INTERNAL-SYMBOL-OUTPUT-FUNCTION* according to the values of *PRINT-CASE*
825 ;;;; and READTABLE-CASE.
828 ;; READTABLE-CASE *PRINT-CASE*
830 ;; :DOWNCASE :DOWNCASE
832 (defun output-preserve-symbol (pname stream)
833 (declare (simple-string pname))
834 (write-string pname stream))
837 ;; READTABLE-CASE *PRINT-CASE*
839 (defun output-lowercase-symbol (pname stream)
840 (declare (simple-string pname))
841 (dotimes (index (length pname))
842 (let ((char (schar pname index)))
843 (write-char (char-downcase char) stream))))
846 ;; READTABLE-CASE *PRINT-CASE*
848 (defun output-uppercase-symbol (pname stream)
849 (declare (simple-string pname))
850 (dotimes (index (length pname))
851 (let ((char (schar pname index)))
852 (write-char (char-upcase char) stream))))
855 ;; READTABLE-CASE *PRINT-CASE*
856 ;; :UPCASE :CAPITALIZE
857 ;; :DOWNCASE :CAPITALIZE
858 (defun output-capitalize-symbol (pname stream)
859 (declare (simple-string pname))
860 (let ((prev-not-alpha t)
861 (up (eq (readtable-case *readtable*) :upcase)))
862 (dotimes (i (length pname))
863 (let ((char (char pname i)))
865 (if (or prev-not-alpha (lower-case-p char))
867 (char-downcase char))
872 (setq prev-not-alpha (not (alpha-char-p char)))))))
875 ;; READTABLE-CASE *PRINT-CASE*
877 (defun output-invert-symbol (pname stream)
878 (declare (simple-string pname))
881 (dotimes (i (length pname))
882 (let ((ch (schar pname i)))
883 (when (both-case-p ch)
884 (if (upper-case-p ch)
886 (setq all-upper nil)))))
887 (cond (all-upper (output-lowercase-symbol pname stream))
888 (all-lower (output-uppercase-symbol pname stream))
890 (write-string pname stream)))))
894 (let ((*readtable* (copy-readtable nil)))
895 (format t "READTABLE-CASE Input Symbol-name~@
896 ----------------------------------~%")
897 (dolist (readtable-case '(:upcase :downcase :preserve :invert))
898 (setf (readtable-case *readtable*) readtable-case)
899 (dolist (input '("ZEBRA" "Zebra" "zebra"))
900 (format t "~&:~A~16T~A~24T~A"
901 (string-upcase readtable-case)
903 (symbol-name (read-from-string input)))))))
906 (let ((*readtable* (copy-readtable nil)))
907 (format t "READTABLE-CASE *PRINT-CASE* Symbol-name Output Princ~@
908 --------------------------------------------------------~%")
909 (dolist (readtable-case '(:upcase :downcase :preserve :invert))
910 (setf (readtable-case *readtable*) readtable-case)
911 (dolist (*print-case* '(:upcase :downcase :capitalize))
912 (dolist (symbol '(|ZEBRA| |Zebra| |zebra|))
913 (format t "~&:~A~15T:~A~29T~A~42T~A~50T~A"
914 (string-upcase readtable-case)
915 (string-upcase *print-case*)
917 (prin1-to-string symbol)
918 (princ-to-string symbol)))))))
921 ;;;; recursive objects
923 (defun output-list (list stream)
924 (descend-into (stream)
925 (write-char #\( stream)
929 (punt-if-too-long length stream)
930 (output-object (pop list) stream)
933 (when (or (atom list) (check-for-circularity list))
934 (write-string " . " stream)
935 (output-object list stream)
937 (write-char #\space stream)
939 (write-char #\) stream)))
941 (defun output-vector (vector stream)
942 (declare (vector vector))
943 (cond ((stringp vector)
944 (if (or *print-escape* *print-readably*)
945 (quote-string vector stream)
946 (write-string vector stream)))
947 ((not (or *print-array* *print-readably*))
948 (output-terse-array vector stream))
949 ((bit-vector-p vector)
950 (write-string "#*" stream)
951 (dotimes (i (length vector))
952 (output-object (aref vector i) stream)))
954 (when (and *print-readably*
955 (not (eq (array-element-type vector) 't)))
956 (error 'print-not-readable :object vector))
957 (descend-into (stream)
958 (write-string "#(" stream)
959 (dotimes (i (length vector))
961 (write-char #\space stream))
962 (punt-if-too-long i stream)
963 (output-object (aref vector i) stream))
964 (write-string ")" stream)))))
966 ;;; This function outputs a string quoting characters sufficiently that so
967 ;;; someone can read it in again. Basically, put a slash in front of an
968 ;;; character satisfying NEEDS-SLASH-P
969 (defun quote-string (string stream)
970 (macrolet ((needs-slash-p (char)
971 ;; KLUDGE: We probably should look at the readtable, but just do
972 ;; this for now. [noted by anonymous long ago] -- WHN 19991130
973 `(or (char= ,char #\\)
975 (write-char #\" stream)
976 (with-array-data ((data string) (start) (end (length string)))
977 (do ((index start (1+ index)))
979 (let ((char (schar data index)))
980 (when (needs-slash-p char) (write-char #\\ stream))
981 (write-char char stream))))
982 (write-char #\" stream)))
984 (defun output-array (array stream)
986 "Outputs the printed representation of any array in either the #< or #A
988 (if (or *print-array* *print-readably*)
989 (output-array-guts array stream)
990 (output-terse-array array stream)))
992 ;;; to output the abbreviated #< form of an array
993 (defun output-terse-array (array stream)
994 (let ((*print-level* nil)
995 (*print-length* nil))
996 (print-unreadable-object (array stream :type t :identity t))))
998 ;;; to output the readable #A form of an array
999 (defun output-array-guts (array stream)
1000 (when (and *print-readably*
1001 (not (eq (array-element-type array) t)))
1002 (error 'print-not-readable :object array))
1003 (write-char #\# stream)
1004 (let ((*print-base* 10))
1005 (output-integer (array-rank array) stream))
1006 (write-char #\A stream)
1007 (with-array-data ((data array) (start) (end))
1008 (declare (ignore end))
1009 (sub-output-array-guts data (array-dimensions array) stream start)))
1011 (defun sub-output-array-guts (array dimensions stream index)
1012 (declare (type (simple-array * (*)) array) (fixnum index))
1013 (cond ((null dimensions)
1014 (output-object (aref array index) stream))
1016 (descend-into (stream)
1017 (write-char #\( stream)
1018 (let* ((dimension (car dimensions))
1019 (dimensions (cdr dimensions))
1020 (count (reduce #'* dimensions)))
1021 (dotimes (i dimension)
1023 (write-char #\space stream))
1024 (punt-if-too-long i stream)
1025 (sub-output-array-guts array dimensions stream index)
1026 (incf index count)))
1027 (write-char #\) stream)))))
1029 ;;; a trivial non-generic-function placeholder for PRINT-OBJECT, for use
1030 ;;; until CLOS is set up (at which time it will be replaced with
1031 ;;; the real generic function implementation)
1032 (defun print-object (instance stream)
1033 (default-structure-print instance stream *current-level*))
1035 ;;;; integer, ratio, and complex printing (i.e. everything but floats)
1037 (defun output-integer (integer stream)
1038 ;; FIXME: This UNLESS form should be pulled out into something like
1039 ;; GET-REASONABLE-PRINT-BASE, along the lines of GET-REASONABLE-PACKAGE
1040 ;; for the *PACKAGE* variable.
1041 (unless (and (fixnump *print-base*)
1042 (< 1 *print-base* 37))
1043 (let ((obase *print-base*))
1044 (setq *print-base* 10.)
1045 (error "~A is not a reasonable value for *PRINT-BASE*." obase)))
1046 (when (and (not (= *print-base* 10.))
1048 ;; First print leading base information, if any.
1049 (write-char #\# stream)
1050 (write-char (case *print-base*
1054 (T (let ((fixbase *print-base*)
1057 (sub-output-integer fixbase stream))
1060 ;; Then output a minus sign if the number is negative, then output
1061 ;; the absolute value of the number.
1062 (cond ((bignump integer) (print-bignum integer stream))
1064 (write-char #\- stream)
1065 (sub-output-integer (- integer) stream))
1067 (sub-output-integer integer stream)))
1068 ;; Print any trailing base information, if any.
1069 (if (and (= *print-base* 10.) *print-radix*)
1070 (write-char #\. stream)))
1072 (defun sub-output-integer (integer stream)
1075 ;; Recurse until you have all the digits pushed on the stack.
1076 (if (not (zerop (multiple-value-setq (quotient remainder)
1077 (truncate integer *print-base*))))
1078 (sub-output-integer quotient stream))
1079 ;; Then as each recursive call unwinds, turn the digit (in remainder)
1080 ;; into a character and output the character.
1081 (write-char (code-char (if (and (> remainder 9.)
1082 (> *print-base* 10.))
1083 (+ (char-code #\A) (- remainder 10.))
1084 (+ (char-code #\0) remainder)))
1087 ;;;; bignum printing
1089 ;;;; written by Steven Handerson (based on Skef's idea)
1091 ;;;; rewritten to remove assumptions about the length of fixnums for the
1092 ;;;; MIPS port by William Lott
1094 ;;; *BASE-POWER* holds the number that we keep dividing into the bignum for
1095 ;;; each *print-base*. We want this number as close to *most-positive-fixnum*
1096 ;;; as possible, i.e. (floor (log most-positive-fixnum *print-base*)).
1097 (defparameter *base-power* (make-array 37 :initial-element nil))
1099 ;;; *FIXNUM-POWER--1* holds the number of digits for each *print-base* that
1100 ;;; fit in the corresponding *base-power*.
1101 (defparameter *fixnum-power--1* (make-array 37 :initial-element nil))
1103 ;;; Print the bignum to the stream. We first generate the correct value for
1104 ;;; *base-power* and *fixnum-power--1* if we have not already. Then we call
1105 ;;; bignum-print-aux to do the printing.
1106 (defun print-bignum (big stream)
1107 (unless (aref *base-power* *print-base*)
1108 (do ((power-1 -1 (1+ power-1))
1109 (new-divisor *print-base* (* new-divisor *print-base*))
1110 (divisor 1 new-divisor))
1111 ((not (fixnump new-divisor))
1112 (setf (aref *base-power* *print-base*) divisor)
1113 (setf (aref *fixnum-power--1* *print-base*) power-1))))
1114 (bignum-print-aux (cond ((minusp big)
1115 (write-char #\- stream)
1118 (aref *base-power* *print-base*)
1119 (aref *fixnum-power--1* *print-base*)
1123 (defun bignum-print-aux (big divisor power-1 stream)
1124 (multiple-value-bind (newbig fix) (truncate big divisor)
1125 (if (fixnump newbig)
1126 (sub-output-integer newbig stream)
1127 (bignum-print-aux newbig divisor power-1 stream))
1128 (do ((zeros power-1 (1- zeros))
1129 (base-power *print-base* (* base-power *print-base*)))
1131 (dotimes (i zeros) (write-char #\0 stream))
1132 (sub-output-integer fix stream)))))
1134 (defun output-ratio (ratio stream)
1136 (write-char #\# stream)
1138 (2 (write-char #\b stream))
1139 (8 (write-char #\o stream))
1140 (16 (write-char #\x stream))
1141 (t (write *print-base* :stream stream :radix nil :base 10)))
1142 (write-char #\r stream))
1143 (let ((*print-radix* nil))
1144 (output-integer (numerator ratio) stream)
1145 (write-char #\/ stream)
1146 (output-integer (denominator ratio) stream)))
1148 (defun output-complex (complex stream)
1149 (write-string "#C(" stream)
1150 (output-object (realpart complex) stream)
1151 (write-char #\space stream)
1152 (output-object (imagpart complex) stream)
1153 (write-char #\) stream))
1157 ;;;; written by Bill Maddox
1159 ;;; FLONUM-TO-STRING (and its subsidiary function FLOAT-STRING) does most of
1160 ;;; the work for all printing of floating point numbers in the printer and in
1161 ;;; FORMAT. It converts a floating point number to a string in a free or
1162 ;;; fixed format with no exponent. The interpretation of the arguments is as
1165 ;;; X - The floating point number to convert, which must not be
1167 ;;; WIDTH - The preferred field width, used to determine the number
1168 ;;; of fraction digits to produce if the FDIGITS parameter
1169 ;;; is unspecified or NIL. If the non-fraction digits and the
1170 ;;; decimal point alone exceed this width, no fraction digits
1171 ;;; will be produced unless a non-NIL value of FDIGITS has been
1172 ;;; specified. Field overflow is not considerd an error at this
1174 ;;; FDIGITS - The number of fractional digits to produce. Insignificant
1175 ;;; trailing zeroes may be introduced as needed. May be
1176 ;;; unspecified or NIL, in which case as many digits as possible
1177 ;;; are generated, subject to the constraint that there are no
1178 ;;; trailing zeroes.
1179 ;;; SCALE - If this parameter is specified or non-NIL, then the number
1180 ;;; printed is (* x (expt 10 scale)). This scaling is exact,
1181 ;;; and cannot lose precision.
1182 ;;; FMIN - This parameter, if specified or non-NIL, is the minimum
1183 ;;; number of fraction digits which will be produced, regardless
1184 ;;; of the value of WIDTH or FDIGITS. This feature is used by
1185 ;;; the ~E format directive to prevent complete loss of
1186 ;;; significance in the printed value due to a bogus choice of
1189 ;;; Most of the optional arguments are for the benefit for FORMAT and are not
1190 ;;; used by the printer.
1193 ;;; (VALUES DIGIT-STRING DIGIT-LENGTH LEADING-POINT TRAILING-POINT DECPNT)
1194 ;;; where the results have the following interpretation:
1196 ;;; DIGIT-STRING - The decimal representation of X, with decimal point.
1197 ;;; DIGIT-LENGTH - The length of the string DIGIT-STRING.
1198 ;;; LEADING-POINT - True if the first character of DIGIT-STRING is the
1200 ;;; TRAILING-POINT - True if the last character of DIGIT-STRING is the
1202 ;;; POINT-POS - The position of the digit preceding the decimal
1203 ;;; point. Zero indicates point before first digit.
1205 ;;; NOTE: FLONUM-TO-STRING goes to a lot of trouble to guarantee accuracy.
1206 ;;; Specifically, the decimal number printed is the closest possible
1207 ;;; approximation to the true value of the binary number to be printed from
1208 ;;; among all decimal representations with the same number of digits. In
1209 ;;; free-format output, i.e. with the number of digits unconstrained, it is
1210 ;;; guaranteed that all the information is preserved, so that a properly-
1211 ;;; rounding reader can reconstruct the original binary number, bit-for-bit,
1212 ;;; from its printed decimal representation. Furthermore, only as many digits
1213 ;;; as necessary to satisfy this condition will be printed.
1215 ;;; FLOAT-STRING actually generates the digits for positive numbers. The
1216 ;;; algorithm is essentially that of algorithm Dragon4 in "How to Print
1217 ;;; Floating-Point Numbers Accurately" by Steele and White. The current
1218 ;;; (draft) version of this paper may be found in [CMUC]<steele>tradix.press.
1219 ;;; DO NOT EVEN THINK OF ATTEMPTING TO UNDERSTAND THIS CODE WITHOUT READING
1222 (defvar *digits* "0123456789")
1224 (defun flonum-to-string (x &optional width fdigits scale fmin)
1226 ;; Zero is a special case which FLOAT-STRING cannot handle.
1228 (let ((s (make-string (1+ fdigits) :initial-element #\0)))
1229 (setf (schar s 0) #\.)
1230 (values s (length s) t (zerop fdigits) 0))
1231 (values "." 1 t t 0)))
1233 (multiple-value-bind (sig exp) (integer-decode-float x)
1234 (let* ((precision (float-precision x))
1235 (digits (float-digits x))
1236 (fudge (- digits precision))
1237 (width (if width (max width 1) nil)))
1238 (float-string (ash sig (- fudge)) (+ exp fudge) precision width
1239 fdigits scale fmin))))))
1241 (defun float-string (fraction exponent precision width fdigits scale fmin)
1242 (let ((r fraction) (s 1) (m- 1) (m+ 1) (k 0)
1243 (digits 0) (decpnt 0) (cutoff nil) (roundup nil) u low high
1244 (digit-string (make-array 50
1245 :element-type 'base-char
1248 ;; Represent fraction as r/s, error bounds as m+/s and m-/s.
1249 ;; Rational arithmetic avoids loss of precision in subsequent calculations.
1250 (cond ((> exponent 0)
1251 (setq r (ash fraction exponent))
1252 (setq m- (ash 1 exponent))
1255 (setq s (ash 1 (- exponent)))))
1256 ;;adjust the error bounds m+ and m- for unequal gaps
1257 (when (= fraction (ash 1 precision))
1258 (setq m+ (ash m+ 1))
1261 ;;scale value by requested amount, and update error bounds
1264 (let ((scale-factor (expt 10 (- scale))))
1265 (setq s (* s scale-factor)))
1266 (let ((scale-factor (expt 10 scale)))
1267 (setq r (* r scale-factor))
1268 (setq m+ (* m+ scale-factor))
1269 (setq m- (* m- scale-factor)))))
1270 ;;scale r and s and compute initial k, the base 10 logarithm of r
1272 ((>= r (ceiling s 10)))
1276 (setq m+ (* m+ 10)))
1279 ((< (+ (ash r 1) m+) (ash s 1)))
1282 ;;determine number of fraction digits to generate
1284 ;;use specified number of fraction digits
1285 (setq cutoff (- fdigits))
1286 ;;don't allow less than fmin fraction digits
1287 (if (and fmin (> cutoff (- fmin))) (setq cutoff (- fmin))))
1289 ;;use as many fraction digits as width will permit
1290 ;;but force at least fmin digits even if width will be exceeded
1292 (setq cutoff (- 1 width))
1293 (setq cutoff (1+ (- k width))))
1294 (if (and fmin (> cutoff (- fmin))) (setq cutoff (- fmin)))))
1295 ;;If we decided to cut off digit generation before precision has
1296 ;;been exhausted, rounding the last digit may cause a carry propagation.
1297 ;;We can prevent this, preserving left-to-right digit generation, with
1298 ;;a few magical adjustments to m- and m+. Of course, correct rounding
1299 ;;is also preserved.
1300 (when (or fdigits width)
1301 (let ((a (- cutoff k))
1304 (dotimes (i a) (setq y (* y 10)))
1305 (dotimes (i (- a)) (setq y (ceiling y 10))))
1306 (setq m- (max y m-))
1307 (setq m+ (max y m+))
1308 (when (= m+ y) (setq roundup t))))
1309 (when (< (+ (ash r 1) m+) (ash s 1)) (return)))
1310 ;;zero-fill before fraction if no integer part
1312 (setq decpnt digits)
1313 (vector-push-extend #\. digit-string)
1315 (incf digits) (vector-push-extend #\0 digit-string)))
1316 ;;generate the significant digits
1320 (vector-push-extend #\. digit-string)
1321 (setq decpnt digits))
1322 (multiple-value-setq (u r) (truncate (* r 10) s))
1325 (setq low (< (ash r 1) m-))
1327 (setq high (>= (ash r 1) (- (ash s 1) m+)))
1328 (setq high (> (ash r 1) (- (ash s 1) m+))))
1329 ;;stop when either precision is exhausted or we have printed as many
1330 ;;fraction digits as permitted
1331 (when (or low high (and cutoff (<= k cutoff))) (return))
1332 (vector-push-extend (char *digits* u) digit-string)
1334 ;; If cutoff occurred before first digit, then no digits are
1335 ;; generated at all.
1336 (when (or (not cutoff) (>= k cutoff))
1337 ;;last digit may need rounding
1338 (vector-push-extend (char *digits*
1339 (cond ((and low (not high)) u)
1340 ((and high (not low)) (1+ u))
1341 (t (if (<= (ash r 1) s) u (1+ u)))))
1344 ;;zero-fill after integer part if no fraction
1346 (dotimes (i k) (incf digits) (vector-push-extend #\0 digit-string))
1347 (vector-push-extend #\. digit-string)
1348 (setq decpnt digits))
1349 ;;add trailing zeroes to pad fraction if fdigits specified
1351 (dotimes (i (- fdigits (- digits decpnt)))
1353 (vector-push-extend #\0 digit-string)))
1355 (values digit-string (1+ digits) (= decpnt 0) (= decpnt digits) decpnt)))
1357 ;;; Given a non-negative floating point number, SCALE-EXPONENT returns a new
1358 ;;; floating point number Z in the range (0.1, 1.0] and an exponent E such
1359 ;;; that Z * 10^E is (approximately) equal to the original number. There may
1360 ;;; be some loss of precision due the floating point representation. The
1361 ;;; scaling is always done with long float arithmetic, which helps printing of
1362 ;;; lesser precisions as well as avoiding generic arithmetic.
1364 ;;; When computing our initial scale factor using EXPT, we pull out part of
1365 ;;; the computation to avoid over/under flow. When denormalized, we must pull
1366 ;;; out a large factor, since there is more negative exponent range than
1368 (defun scale-exponent (original-x)
1369 (let* ((x (coerce original-x 'long-float)))
1370 (multiple-value-bind (sig exponent) (decode-float x)
1371 (declare (ignore sig))
1373 (values (float 0.0l0 original-x) 1)
1374 (let* ((ex (round (* exponent (log 2l0 10))))
1376 (if (float-denormalized-p x)
1378 (* x 1.0l16 (expt 10.0l0 (- (- ex) 16)))
1380 (* x 1.0l18 (expt 10.0l0 (- (- ex) 18)))
1381 (* x 10.0l0 (expt 10.0l0 (- (- ex) 1))))
1382 (/ x 10.0l0 (expt 10.0l0 (1- ex))))))
1383 (do ((d 10.0l0 (* d 10.0l0))
1387 (do ((m 10.0l0 (* m 10.0l0))
1391 (values (float z original-x) ex))))))))))
1393 ;;;; entry point for the float printer
1395 ;;; Entry point for the float printer as called by PRINT, PRIN1, PRINC,
1396 ;;; etc. The argument is printed free-format, in either exponential or
1397 ;;; non-exponential notation, depending on its magnitude.
1399 ;;; NOTE: When a number is to be printed in exponential format, it is scaled in
1400 ;;; floating point. Since precision may be lost in this process, the
1401 ;;; guaranteed accuracy properties of FLONUM-TO-STRING are lost. The
1402 ;;; difficulty is that FLONUM-TO-STRING performs extensive computations with
1403 ;;; integers of similar magnitude to that of the number being printed. For
1404 ;;; large exponents, the bignums really get out of hand. If bignum arithmetic
1405 ;;; becomes reasonably fast and the exponent range is not too large, then it
1406 ;;; might become attractive to handle exponential notation with the same
1407 ;;; accuracy as non-exponential notation, using the method described in the
1408 ;;; Steele and White paper.
1410 ;;; Print the appropriate exponent marker for X and the specified exponent.
1411 (defun print-float-exponent (x exp stream)
1412 (declare (type float x) (type integer exp) (type stream stream))
1413 (let ((*print-radix* nil)
1414 (plusp (plusp exp)))
1415 (if (typep x *read-default-float-format*)
1417 (format stream "e~:[~;+~]~D" plusp exp))
1418 (format stream "~C~:[~;+~]~D"
1426 ;;; Write out an infinity using #. notation, or flame out if
1427 ;;; *print-readably* is true and *read-eval* is false.
1429 (defun output-float-infinity (x stream)
1430 (declare (type float x) (type stream stream))
1432 (write-string "#." stream))
1434 (error 'print-not-readable :object x))
1436 (write-string "#<" stream)))
1437 (write-string "EXT:" stream)
1438 (princ (float-format-name x) stream)
1439 (write-string (if (plusp x) "-POSITIVE-" "-NEGATIVE-")
1441 (write-string "INFINITY" stream)
1443 (write-string ">" stream)))
1445 ;;; Output a #< NaN or die trying.
1446 (defun output-float-nan (x stream)
1447 (print-unreadable-object (x stream)
1448 (princ (float-format-name x) stream)
1449 (write-string (if (float-trapping-nan-p x) " trapping" " quiet") stream)
1450 (write-string " NaN" stream)))
1452 ;;; the function called by OUTPUT-OBJECT to handle floats
1453 (defun output-float (x stream)
1455 ((float-infinity-p x)
1456 (output-float-infinity x stream))
1458 (output-float-nan x stream))
1460 (let ((x (cond ((minusp (float-sign x))
1461 (write-char #\- stream)
1467 (write-string "0.0" stream)
1468 (print-float-exponent x 0 stream))
1470 (output-float-aux x stream (float 1/1000 x) (float 10000000 x))))))))
1471 (defun output-float-aux (x stream e-min e-max)
1472 (if (and (>= x e-min) (< x e-max))
1474 (multiple-value-bind (str len lpoint tpoint) (flonum-to-string x)
1475 (declare (ignore len))
1476 (when lpoint (write-char #\0 stream))
1477 (write-string str stream)
1478 (when tpoint (write-char #\0 stream))
1479 (print-float-exponent x 0 stream))
1480 ;; exponential format
1481 (multiple-value-bind (f ex) (scale-exponent x)
1482 (multiple-value-bind (str len lpoint tpoint)
1483 (flonum-to-string f nil nil 1)
1484 (declare (ignore len))
1485 (when lpoint (write-char #\0 stream))
1486 (write-string str stream)
1487 (when tpoint (write-char #\0 stream))
1488 ;; Subtract out scale factor of 1 passed to FLONUM-TO-STRING.
1489 (print-float-exponent x (1- ex) stream)))))
1491 ;;;; other leaf objects
1493 ;;; If *PRINT-ESCAPE* is false, just do a WRITE-CHAR, otherwise output the
1494 ;;; character name or the character in the #\char format.
1495 (defun output-character (char stream)
1496 (if (or *print-escape* *print-readably*)
1497 (let ((name (char-name char)))
1498 (write-string "#\\" stream)
1500 (write-string name stream)
1501 (write-char char stream)))
1502 (write-char char stream)))
1504 (defun output-sap (sap stream)
1505 (declare (type system-area-pointer sap))
1507 (format stream "#.(~S #X~8,'0X)" 'int-sap (sap-int sap)))
1509 (print-unreadable-object (sap stream)
1510 (format stream "system area pointer: #X~8,'0X" (sap-int sap))))))
1512 (defun output-weak-pointer (weak-pointer stream)
1513 (declare (type weak-pointer weak-pointer))
1514 (print-unreadable-object (weak-pointer stream)
1515 (multiple-value-bind (value validp) (weak-pointer-value weak-pointer)
1517 (write-string "weak pointer: " stream)
1518 (write value :stream stream))
1520 (write-string "broken weak pointer" stream))))))
1522 (defun output-code-component (component stream)
1523 (print-unreadable-object (component stream :identity t)
1524 (let ((dinfo (%code-debug-info component)))
1525 (cond ((eq dinfo :bogus-lra)
1526 (write-string "bogus code object" stream))
1528 (write-string "code object" stream)
1530 (write-char #\space stream)
1531 (output-object (sb!c::debug-info-name dinfo) stream)))))))
1533 (defun output-lra (lra stream)
1534 (print-unreadable-object (lra stream :identity t)
1535 (write-string "return PC object" stream)))
1537 (defun output-fdefn (fdefn stream)
1538 (print-unreadable-object (fdefn stream)
1539 (write-string "FDEFINITION object for " stream)
1540 (output-object (fdefn-name fdefn) stream)))
1544 ;;; Output OBJECT as using PRINT-OBJECT if it's a
1545 ;;; FUNCALLABLE-STANDARD-CLASS, or return NIL otherwise.
1547 ;;; The definition here is a simple temporary placeholder. It will be
1548 ;;; overwritten by a smarter version (capable of calling generic
1549 ;;; PRINT-OBJECT when appropriate) when CLOS is installed.
1550 (defun printed-as-clos-funcallable-standard-class (object stream)
1551 (declare (ignore object stream))
1554 (defun output-function (object stream)
1555 (let* ((*print-length* 3) ; in case we have to..
1556 (*print-level* 3) ; ..print an interpreted function definition
1557 (name (cond ((find (function-subtype object)
1558 #(#.sb!vm:closure-header-type
1559 #.sb!vm:byte-code-closure-type))
1561 ((sb!eval::interpreted-function-p object)
1562 (or (sb!eval::interpreted-function-%name object)
1563 (sb!eval:interpreted-function-lambda-expression
1565 ((find (function-subtype object)
1566 #(#.sb!vm:function-header-type
1567 #.sb!vm:closure-function-header-type))
1568 (%function-name object))
1569 (t 'no-name-available)))
1570 (identified-by-name-p (and (symbolp name)
1572 (eq (fdefinition name) object))))
1573 (print-unreadable-object (object
1575 :identity (not identified-by-name-p))
1576 (prin1 'function stream)
1577 (unless (eq name 'no-name-available)
1578 (format stream " ~S" name)))))
1580 ;;;; catch-all for unknown things
1582 (defun output-random (object stream)
1583 (print-unreadable-object (object stream :identity t)
1584 (let ((lowtag (get-lowtag object)))
1586 (#.sb!vm:other-pointer-type
1587 (let ((type (get-type object)))
1589 (#.sb!vm:value-cell-header-type
1590 (write-string "value cell " stream)
1591 (output-object (sb!c:value-cell-ref object) stream))
1593 (write-string "unknown pointer object, type=" stream)
1594 (let ((*print-base* 16) (*print-radix* t))
1595 (output-integer type stream))))))
1596 ((#.sb!vm:function-pointer-type
1597 #.sb!vm:instance-pointer-type
1598 #.sb!vm:list-pointer-type)
1599 (write-string "unknown pointer object, type=" stream))
1601 (case (get-type object)
1602 (#.sb!vm:unbound-marker-type
1603 (write-string "unbound marker" stream))
1605 (write-string "unknown immediate object, lowtag=" stream)
1606 (let ((*print-base* 2) (*print-radix* t))
1607 (output-integer lowtag stream))
1608 (write-string ", type=" stream)
1609 (let ((*print-base* 16) (*print-radix* t))
1610 (output-integer (get-type object) stream)))))))))