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")
14 ;;;; exported printer control variables
16 (!defvar
*print-readably
* nil
18 "If true, all objects will be printed readably. If readable printing
19 is impossible, an error will be signalled. This overrides the value of
21 (!defvar
*print-escape
* t
23 "Should we print in a reasonably machine-readable way? (possibly
24 overridden by *PRINT-READABLY*)")
25 (!defvar
*print-pretty
* nil
; (set later when pretty-printer is initialized)
27 "Should pretty printing be used?")
28 (!defvar
*print-base
* 10.
30 "The output base for RATIONALs (including integers).")
31 (!defvar
*print-radix
* nil
33 "Should base be verified when printing RATIONALs?")
34 (!defvar
*print-level
* nil
36 "How many levels should be printed before abbreviating with \"#\"?")
37 (!defvar
*print-length
* nil
39 "How many elements at any level should be printed before abbreviating
41 (!defvar
*print-circle
* nil
43 "Should we use #n= and #n# notation to preserve uniqueness in general (and
44 circularity in particular) when printing?")
45 (!defvar
*print-case
* :upcase
47 "What case should the printer should use default?")
48 (!defvar
*print-array
* t
50 "Should the contents of arrays be printed?")
51 (!defvar
*print-gensym
* t
53 "Should #: prefixes be used when printing symbols with null SYMBOL-PACKAGE?")
54 (!defvar
*print-lines
* nil
56 "The maximum number of lines to print per object.")
57 (!defvar
*print-right-margin
* nil
59 "The position of the right margin in ems (for pretty-printing).")
60 (!defvar
*print-miser-width
* nil
62 "If the remaining space between the current column and the right margin
63 is less than this, then print using ``miser-style'' output. Miser
64 style conditional newlines are turned on, and all indentations are
65 turned off. If NIL, never use miser mode.")
66 (defvar *print-pprint-dispatch
*
67 (sb!pretty
::make-pprint-dispatch-table
) ; for type-correctness
69 "The pprint-dispatch-table that controls how to pretty-print objects.")
70 (!defvar
*suppress-print-errors
* nil
72 "Suppress printer errors when the condition is of the type designated by this
73 variable: an unreadable object representing the error is printed instead.")
75 ;; duplicate defglobal because this file is compiled before "reader"
76 (defglobal *standard-readtable
* nil
)
78 (defun %with-standard-io-syntax
(function)
79 (declare (type function function
))
80 (let ((*package
* (find-package "COMMON-LISP-USER"))
83 (*print-case
* :upcase
)
90 (*print-miser-width
* nil
)
91 (*print-pprint-dispatch
* sb
!pretty
::*standard-pprint-dispatch-table
*)
95 (*print-right-margin
* nil
)
97 (*read-default-float-format
* 'single-float
)
100 (*readtable
* *standard-readtable
*)
101 (*suppress-print-errors
* nil
))
104 ;;;; routines to print objects
106 (macrolet ((def (fn doc
&rest forms
)
107 (declare (ignorable doc
))
111 ,@(if (eq fn
'write
) '(stream))
112 ((:escape
*print-escape
*) *print-escape
*)
113 ((:radix
*print-radix
*) *print-radix
*)
114 ((:base
*print-base
*) *print-base
*)
115 ((:circle
*print-circle
*) *print-circle
*)
116 ((:pretty
*print-pretty
*) *print-pretty
*)
117 ((:level
*print-level
*) *print-level
*)
118 ((:length
*print-length
*) *print-length
*)
119 ((:case
*print-case
*) *print-case
*)
120 ((:array
*print-array
*) *print-array
*)
121 ((:gensym
*print-gensym
*) *print-gensym
*)
122 ((:readably
*print-readably
*) *print-readably
*)
123 ((:right-margin
*print-right-margin
*)
124 *print-right-margin
*)
125 ((:miser-width
*print-miser-width
*)
127 ((:lines
*print-lines
*) *print-lines
*)
128 ((:pprint-dispatch
*print-pprint-dispatch
*)
129 *print-pprint-dispatch
*)
130 ((:suppress-errors
*suppress-print-errors
*)
131 *suppress-print-errors
*))
133 (declare (explicit-check))
136 "Output OBJECT to the specified stream, defaulting to *STANDARD-OUTPUT*."
137 (output-object object
(out-synonym-of stream
))
140 "Return the printed representation of OBJECT as a string."
141 (stringify-object object
)))
143 ;;; Same as a call to (WRITE OBJECT :STREAM STREAM), but returning OBJECT.
144 (defun %write
(object stream
)
145 (declare (explicit-check))
146 (output-object object
(out-synonym-of stream
))
149 (defun prin1 (object &optional stream
)
151 "Output a mostly READable printed representation of OBJECT on the specified
153 (declare (explicit-check))
154 (let ((*print-escape
* t
))
155 (output-object object
(out-synonym-of stream
)))
158 (defun princ (object &optional stream
)
160 "Output an aesthetic but not necessarily READable printed representation
161 of OBJECT on the specified STREAM."
162 (declare (explicit-check))
163 (let ((*print-escape
* nil
)
164 (*print-readably
* nil
))
165 (output-object object
(out-synonym-of stream
)))
168 (defun print (object &optional stream
)
170 "Output a newline, the mostly READable printed representation of OBJECT, and
171 space to the specified STREAM."
172 (declare (explicit-check))
173 (let ((stream (out-synonym-of stream
)))
175 (prin1 object stream
)
176 (write-char #\space stream
)
179 (defun pprint (object &optional stream
)
181 "Prettily output OBJECT preceded by a newline."
182 (declare (explicit-check))
183 (let ((*print-pretty
* t
)
185 (stream (out-synonym-of stream
)))
187 (output-object object stream
))
190 (defun prin1-to-string (object)
192 "Return the printed representation of OBJECT as a string with
194 (let ((*print-escape
* t
))
195 (stringify-object object
)))
197 (defun princ-to-string (object)
199 "Return the printed representation of OBJECT as a string with
201 (let ((*print-escape
* nil
)
202 (*print-readably
* nil
))
203 (stringify-object object
)))
205 ;;; This produces the printed representation of an object as a string.
206 ;;; The few ...-TO-STRING functions above call this.
207 (defun stringify-object (object)
208 (let ((stream (make-string-output-stream)))
209 (setup-printer-state)
210 (output-object object stream
)
211 (get-output-stream-string stream
)))
213 ;;;; support for the PRINT-UNREADABLE-OBJECT macro
215 (defun print-not-readable-error (object stream
)
217 (error 'print-not-readable
:object object
)
219 :report
"Print unreadably."
220 (let ((*print-readably
* nil
))
221 (output-object object stream
)
224 :report
"Supply an object to be printed instead."
227 (read-evaluated-form "~@<Enter an object (evaluated): ~@:>"))
228 (output-object o stream
)
231 ;;; guts of PRINT-UNREADABLE-OBJECT
232 (defun %print-unreadable-object
(object stream type identity
&optional body
)
233 (declare (type (or null function
) body
))
235 (print-not-readable-error object stream
)
236 (flet ((print-description ()
238 (write (type-of object
) :stream stream
:circle nil
239 :level nil
:length nil
)
240 (write-char #\space stream
)
241 (pprint-newline :fill stream
))
245 (when (or body
(not type
))
246 (write-char #\space stream
))
247 (pprint-newline :fill stream
)
248 (write-char #\
{ stream
)
249 (write (get-lisp-obj-address object
) :stream stream
251 (write-char #\
} stream
))))
252 (cond ((print-pretty-on-stream-p stream
)
253 ;; Since we're printing prettily on STREAM, format the
254 ;; object within a logical block. PPRINT-LOGICAL-BLOCK does
255 ;; not rebind the stream when it is already a pretty stream,
256 ;; so output from the body will go to the same stream.
257 (pprint-logical-block (stream nil
:prefix
"#<" :suffix
">")
258 (print-description)))
260 (write-string "#<" stream
)
262 (write-char #\
> stream
)))))
265 ;;;; OUTPUT-OBJECT -- the main entry point
267 ;;; Objects whose print representation identifies them EQLly don't
268 ;;; need to be checked for circularity.
269 (defun uniquely-identified-by-print-p (x)
273 (symbol-package x
))))
275 (defvar *in-print-error
* nil
)
277 ;;; Output OBJECT to STREAM observing all printer control variables.
278 (defun output-object (object stream
)
279 ;; FIXME: this function is declared EXPLICIT-CHECK, so it allows STREAM
280 ;; to be T or NIL (a stream-designator), which is not really right
281 ;; if eventually the call will be to a PRINT-OBJECT method,
282 ;; since the generic function should always receive a stream.
283 (declare (explicit-check))
284 (labels ((print-it (stream)
285 (multiple-value-bind (fun pretty
)
286 (and *print-pretty
* (pprint-dispatch object
))
288 (sb!pretty
::with-pretty-stream
(stream)
289 (funcall fun stream object
))
290 (output-ugly-object stream object
))))
292 (if *suppress-print-errors
*
293 (handler-bind ((condition
294 (lambda (condition) nil
295 (when (typep condition
*suppress-print-errors
*)
296 (cond (*in-print-error
*
297 (write-string "(error printing " stream
)
298 (write-string *in-print-error
* stream
)
299 (write-string ")" stream
))
301 ;; Give outer handlers a chance.
303 (continue "Suppress the error.")
305 (let ((*print-readably
* nil
)
308 "#<error printing a " stream
)
309 (let ((*in-print-error
* "type"))
310 (output-object (type-of object
) stream
))
311 (write-string ": " stream
)
312 (let ((*in-print-error
* "condition"))
313 (output-object condition stream
))
314 (write-string ">" stream
))))
315 (return-from handle-it object
)))))
319 (multiple-value-bind (marker initiate
)
320 (check-for-circularity object t
)
321 (if (eq initiate
:initiate
)
322 (let ((*circularity-hash-table
*
323 (make-hash-table :test
'eq
)))
324 (check-it (make-broadcast-stream))
325 (let ((*circularity-counter
* 0))
329 (when (handle-circularity marker stream
)
331 (handle-it stream
))))))
332 (cond (;; Maybe we don't need to bother with circularity detection.
333 (or (not *print-circle
*)
334 (uniquely-identified-by-print-p object
))
336 (;; If we have already started circularity detection, this
337 ;; object might be a shared reference. If we have not, then
338 ;; if it is a compound object it might contain a circular
339 ;; reference to itself or multiple shared references.
340 (or *circularity-hash-table
*
341 (compound-object-p object
))
344 (handle-it stream
)))))
346 ;;; a hack to work around recurring gotchas with printing while
347 ;;; DEFGENERIC PRINT-OBJECT is being built
349 ;;; (hopefully will go away naturally when CLOS moves into cold init)
350 (defvar *print-object-is-disabled-p
*)
352 ;;; Output OBJECT to STREAM observing all printer control variables
353 ;;; except for *PRINT-PRETTY*. Note: if *PRINT-PRETTY* is non-NIL,
354 ;;; then the pretty printer will be used for any components of OBJECT,
355 ;;; just not for OBJECT itself.
356 (defun output-ugly-object (stream object
)
358 ;; KLUDGE: The TYPECASE approach here is non-ANSI; the ANSI definition of
359 ;; PRINT-OBJECT says it provides printing and we're supposed to provide
360 ;; PRINT-OBJECT methods covering all classes. We deviate from this
361 ;; by using PRINT-OBJECT only when we print instance values. However,
362 ;; ANSI makes it hard to tell that we're deviating from this:
363 ;; (1) ANSI specifies that the user isn't supposed to call PRINT-OBJECT
365 ;; (2) ANSI (section 11.1.2.1.2) says it's undefined to define
366 ;; a method on an external symbol in the CL package which is
367 ;; applicable to arg lists containing only direct instances of
368 ;; standardized classes.
369 ;; Thus, in order for the user to detect our sleaziness in conforming
370 ;; code, he has to do something relatively obscure like
371 ;; (1) actually use tools like FIND-METHOD to look for PRINT-OBJECT
373 ;; (2) define a PRINT-OBJECT method which is specialized on the stream
374 ;; value (e.g. a Gray stream object).
375 ;; As long as no one comes up with a non-obscure way of detecting this
376 ;; sleaziness, fixing this nonconformity will probably have a low
377 ;; priority. -- WHN 2001-11-25
380 (output-symbol object stream
)
381 (output-list object stream
)))
383 ;; The first case takes the above idea one step further: If an instance
384 ;; isn't a citizen yet, it has no right to a print-object method.
385 ;; Additionally, if the object is an obsolete CONDITION, don't crash.
386 ;; (There is no update-instance protocol for conditions)
387 (let* ((layout (layout-of object
))
388 (classoid (layout-classoid layout
)))
389 (cond ((or (sb!kernel
::undefined-classoid-p classoid
)
390 (and (layout-invalid layout
) (condition-classoid-p classoid
)))
391 ;; not only is this unreadable, it's unprintable too.
392 (print-unreadable-object (object stream
:identity t
)
393 (format stream
"UNPRINTABLE instance of ~W" classoid
)))
394 ((not (and (boundp '*print-object-is-disabled-p
*)
395 *print-object-is-disabled-p
*))
396 (print-object object stream
))
397 ((typep object
'structure-object
)
398 (default-structure-print object stream
*current-level-in-print
*))
400 (write-string "#<INSTANCE but not STRUCTURE-OBJECT>" stream
)))))
401 (funcallable-instance
403 ((not (and (boundp '*print-object-is-disabled-p
*)
404 *print-object-is-disabled-p
*))
405 (print-object object stream
))
406 (t (output-fun object stream
))))
408 (output-fun object stream
))
410 (output-symbol object stream
))
414 (output-integer object stream
))
416 (output-float object stream
))
418 (output-ratio object stream
))
420 (output-complex object stream
))))
422 (output-character object stream
))
424 (output-vector object stream
))
426 (output-array object stream
))
428 (output-sap object stream
))
430 (output-weak-pointer object stream
))
432 (output-lra object stream
))
434 (output-code-component object stream
))
436 (output-fdefn object stream
))
439 (print-object object stream
))
441 (output-random object stream
))))
445 ;;; values of *PRINT-CASE* and (READTABLE-CASE *READTABLE*) the last
446 ;;; time the printer was called
447 (defvar *previous-case
* nil
)
448 (defvar *previous-readtable-case
* nil
)
450 ;;; This variable contains the current definition of one of three
451 ;;; symbol printers. SETUP-PRINTER-STATE sets this variable.
452 (defvar *internal-symbol-output-fun
* nil
)
453 (declaim (function *internal-symbol-output-fun
*))
455 ;;; Output PNAME (a symbol-name or package-name) surrounded with |'s,
456 ;;; and with any embedded |'s or \'s escaped.
457 (defun output-quoted-symbol-name (pname stream
)
458 (declare (string pname
))
459 (write-char #\| stream
)
460 (dotimes (index (length pname
))
461 (let ((char (schar pname index
)))
462 (when (or (char= char
#\\) (char= char
#\|
))
463 (write-char #\\ stream
))
464 (write-char char stream
)))
465 (write-char #\| stream
))
467 (defun output-symbol (object stream
)
468 (declare (symbol object
))
469 (if (or *print-escape
* *print-readably
*)
470 (let ((package (symbol-package object
))
471 (name (symbol-name object
))
472 (current (sane-package)))
474 ;; The ANSI spec "22.1.3.3.1 Package Prefixes for Symbols"
475 ;; requires that keywords be printed with preceding colons
476 ;; always, regardless of the value of *PACKAGE*.
477 ((eq package
*keyword-package
*)
478 (write-char #\
: stream
))
479 ;; Otherwise, if the symbol's home package is the current
480 ;; one, then a prefix is never necessary.
481 ((eq package current
))
482 ;; Uninterned symbols print with a leading #:.
484 (when (or *print-gensym
* *print-readably
*)
485 (write-string "#:" stream
)))
487 (multiple-value-bind (symbol accessible
)
488 (find-symbol name current
)
489 ;; If we can find the symbol by looking it up, it need not
490 ;; be qualified. This can happen if the symbol has been
491 ;; inherited from a package other than its home package.
493 ;; To preserve print-read consistency, use the local nickname if
495 (unless (and accessible
(eq symbol object
))
496 (let ((prefix (or (car (rassoc package
(package-%local-nicknames current
)))
497 (package-name package
))))
498 (output-symbol-name prefix stream
))
499 (if (nth-value 1 (find-external-symbol name package
))
500 (write-char #\
: stream
)
501 (write-string "::" stream
))))))
502 (output-symbol-name name stream
))
503 (output-symbol-name (symbol-name object
) stream nil
)))
505 ;;; Output the string NAME as if it were a symbol name. In other
506 ;;; words, diddle its case according to *PRINT-CASE* and
508 (defun output-symbol-name (name stream
&optional
(maybe-quote t
))
509 (declare (type simple-string name
))
510 (let ((*readtable
* (if *print-readably
* *standard-readtable
* *readtable
*)))
511 (setup-printer-state)
512 (if (and maybe-quote
(or
513 (and (readtable-normalization *readtable
*)
514 (not (sb!unicode
:normalized-p name
:nfkc
)))
515 (symbol-quotep name
)))
516 (output-quoted-symbol-name name stream
)
517 (funcall *internal-symbol-output-fun
* name stream
))))
519 ;;;; escaping symbols
521 ;;; When we print symbols we have to figure out if they need to be
522 ;;; printed with escape characters. This isn't a whole lot easier than
523 ;;; reading symbols in the first place.
525 ;;; For each character, the value of the corresponding element is a
526 ;;; fixnum with bits set corresponding to attributes that the
527 ;;; character has. At characters have at least one bit set, so we can
528 ;;; search for any character with a positive test.
529 (defvar *character-attributes
*
530 (make-array 160 ; FIXME
531 :element-type
'(unsigned-byte 16)
533 (declaim (type (simple-array (unsigned-byte 16) (#.160)) ; FIXME
534 *character-attributes
*))
536 ;;; constants which are a bit-mask for each interesting character attribute
537 (defconstant other-attribute
(ash 1 0)) ; Anything else legal.
538 (defconstant number-attribute
(ash 1 1)) ; A numeric digit.
539 (defconstant uppercase-attribute
(ash 1 2)) ; An uppercase letter.
540 (defconstant lowercase-attribute
(ash 1 3)) ; A lowercase letter.
541 (defconstant sign-attribute
(ash 1 4)) ; +-
542 (defconstant extension-attribute
(ash 1 5)) ; ^_
543 (defconstant dot-attribute
(ash 1 6)) ; .
544 (defconstant slash-attribute
(ash 1 7)) ; /
545 (defconstant funny-attribute
(ash 1 8)) ; Anything illegal.
547 (eval-when (:compile-toplevel
:load-toplevel
:execute
)
549 ;;; LETTER-ATTRIBUTE is a local of SYMBOL-QUOTEP. It matches letters
550 ;;; that don't need to be escaped (according to READTABLE-CASE.)
551 (defparameter *attribute-names
*
552 `((number . number-attribute
) (lowercase . lowercase-attribute
)
553 (uppercase . uppercase-attribute
) (letter . letter-attribute
)
554 (sign . sign-attribute
) (extension . extension-attribute
)
555 (dot . dot-attribute
) (slash . slash-attribute
)
556 (other . other-attribute
) (funny . funny-attribute
)))
560 ;;; For each character, the value of the corresponding element is the
561 ;;; lowest base in which that character is a digit.
562 (declaim (type (simple-array (unsigned-byte 8) (128)) ; FIXME: range?
564 (defvar *digit-bases
*
565 (make-array 128 ; FIXME
566 :element-type
'(unsigned-byte 8)))
568 (defun !printer-cold-init
()
569 ;; The dispatch table will be changed later, so this doesn't really matter
570 ;; except if a full call to WRITE wants to read the current binding.
571 (setq *print-pprint-dispatch
* (sb!pretty
::make-pprint-dispatch-table
))
572 (setq *digit-bases
* (make-array 128 ; FIXME
573 :element-type
'(unsigned-byte 8)
575 *character-attributes
* (make-array 160 ; FIXME
576 :element-type
'(unsigned-byte 16)
579 (let ((char (digit-char i
36)))
580 (setf (aref *digit-bases
* (char-code char
)) i
)))
582 (flet ((set-bit (char bit
)
583 (let ((code (char-code char
)))
584 (setf (aref *character-attributes
* code
)
585 (logior bit
(aref *character-attributes
* code
))))))
587 (dolist (char '(#\
! #\
@ #\$
#\%
#\
& #\
* #\
= #\~
#\
[ #\
] #\
{ #\
}
589 (set-bit char other-attribute
))
592 (set-bit (digit-char i
) number-attribute
))
594 (do ((code (char-code #\A
) (1+ code
))
595 (end (char-code #\Z
)))
597 (declare (fixnum code end
))
598 (set-bit (code-char code
) uppercase-attribute
)
599 (set-bit (char-downcase (code-char code
)) lowercase-attribute
))
601 (set-bit #\- sign-attribute
)
602 (set-bit #\
+ sign-attribute
)
603 (set-bit #\^ extension-attribute
)
604 (set-bit #\_ extension-attribute
)
605 (set-bit #\. dot-attribute
)
606 (set-bit #\
/ slash-attribute
)
608 ;; Mark anything not explicitly allowed as funny.
609 (dotimes (i 160) ; FIXME
610 (when (zerop (aref *character-attributes
* i
))
611 (setf (aref *character-attributes
* i
) funny-attribute
))))
612 ) ; end !COLD-PRINT-INIT
614 ;;; A FSM-like thingie that determines whether a symbol is a potential
615 ;;; number or has evil characters in it.
616 (defun symbol-quotep (name)
617 (declare (simple-string name
))
618 (macrolet ((advance (tag &optional
(at-end t
))
621 ,(if at-end
'(go TEST-SIGN
) '(return nil
)))
622 (setq current
(schar name index
)
623 code
(char-code current
)
625 ((< code
160) (aref attributes code
))
626 ((upper-case-p current
) uppercase-attribute
)
627 ((lower-case-p current
) lowercase-attribute
)
628 (t other-attribute
)))
631 (test (&rest attributes
)
643 `(and (< code
128) ; FIXME
644 (< (the fixnum
(aref bases code
)) base
))))
646 (prog ((len (length name
))
647 (attributes *character-attributes
*)
648 (bases *digit-bases
*)
651 (case (%readtable-case
*readtable
*)
652 (:upcase uppercase-attribute
)
653 (:downcase lowercase-attribute
)
654 (t (logior lowercase-attribute uppercase-attribute
))))
659 (declare (fixnum len base index bits code
))
662 TEST-SIGN
; At end, see whether it is a sign...
663 (return (not (test sign
)))
665 OTHER
; not potential number, see whether funny chars...
666 (let ((mask (logxor (logior lowercase-attribute uppercase-attribute
669 (do ((i (1- index
) (1+ i
)))
670 ((= i len
) (return-from symbol-quotep nil
))
671 (unless (zerop (logand (let* ((char (schar name i
))
672 (code (char-code char
)))
674 ((< code
160) (aref attributes code
))
675 ((upper-case-p char
) uppercase-attribute
)
676 ((lower-case-p char
) lowercase-attribute
)
677 (t other-attribute
)))
679 (return-from symbol-quotep t
))))
684 (advance LAST-DIGIT-ALPHA
)
686 (when (test letter number other slash
) (advance OTHER nil
))
687 (when (char= current
#\.
) (advance DOT-FOUND
))
688 (when (test sign extension
) (advance START-STUFF nil
))
691 DOT-FOUND
; leading dots...
692 (when (test letter
) (advance START-DOT-MARKER nil
))
693 (when (digitp) (advance DOT-DIGIT
))
694 (when (test number other
) (advance OTHER nil
))
695 (when (test extension slash sign
) (advance START-DOT-STUFF nil
))
696 (when (char= current
#\.
) (advance DOT-FOUND
))
699 START-STUFF
; leading stuff before any dot or digit
702 (advance LAST-DIGIT-ALPHA
)
704 (when (test number other
) (advance OTHER nil
))
705 (when (test letter
) (advance START-MARKER nil
))
706 (when (char= current
#\.
) (advance START-DOT-STUFF nil
))
707 (when (test sign extension slash
) (advance START-STUFF nil
))
710 START-MARKER
; number marker in leading stuff...
711 (when (test letter
) (advance OTHER nil
))
714 START-DOT-STUFF
; leading stuff containing dot without digit...
715 (when (test letter
) (advance START-DOT-STUFF nil
))
716 (when (digitp) (advance DOT-DIGIT
))
717 (when (test sign extension dot slash
) (advance START-DOT-STUFF nil
))
718 (when (test number other
) (advance OTHER nil
))
721 START-DOT-MARKER
; number marker in leading stuff with dot..
722 ;; leading stuff containing dot without digit followed by letter...
723 (when (test letter
) (advance OTHER nil
))
726 DOT-DIGIT
; in a thing with dots...
727 (when (test letter
) (advance DOT-MARKER
))
728 (when (digitp) (advance DOT-DIGIT
))
729 (when (test number other
) (advance OTHER nil
))
730 (when (test sign extension dot slash
) (advance DOT-DIGIT
))
733 DOT-MARKER
; number marker in number with dot...
734 (when (test letter
) (advance OTHER nil
))
737 LAST-DIGIT-ALPHA
; previous char is a letter digit...
738 (when (or (digitp) (test sign slash
))
739 (advance ALPHA-DIGIT
))
740 (when (test letter number other dot
) (advance OTHER nil
))
743 ALPHA-DIGIT
; seen a digit which is a letter...
744 (when (or (digitp) (test sign slash
))
746 (advance LAST-DIGIT-ALPHA
)
747 (advance ALPHA-DIGIT
)))
748 (when (test letter
) (advance ALPHA-MARKER
))
749 (when (test number other dot
) (advance OTHER nil
))
752 ALPHA-MARKER
; number marker in number with alpha digit...
753 (when (test letter
) (advance OTHER nil
))
756 DIGIT
; seen only ordinary (non-alphabetic) numeric digits...
759 (advance ALPHA-DIGIT
)
761 (when (test number other
) (advance OTHER nil
))
762 (when (test letter
) (advance MARKER
))
763 (when (test extension slash sign
) (advance DIGIT
))
764 (when (char= current
#\.
) (advance DOT-DIGIT
))
767 MARKER
; number marker in a numeric number...
768 ;; ("What," you may ask, "is a 'number marker'?" It's something
769 ;; that a conforming implementation might use in number syntax.
770 ;; See ANSI 2.3.1.1 "Potential Numbers as Tokens".)
771 (when (test letter
) (advance OTHER nil
))
774 ;;;; *INTERNAL-SYMBOL-OUTPUT-FUN*
776 ;;;; case hackery: These functions are stored in
777 ;;;; *INTERNAL-SYMBOL-OUTPUT-FUN* according to the values of
778 ;;;; *PRINT-CASE* and READTABLE-CASE.
781 ;;; READTABLE-CASE *PRINT-CASE*
783 ;;; :DOWNCASE :DOWNCASE
785 (defun output-preserve-symbol (pname stream
)
786 (declare (simple-string pname
))
787 (write-string pname stream
))
790 ;;; READTABLE-CASE *PRINT-CASE*
791 ;;; :UPCASE :DOWNCASE
792 (defun output-lowercase-symbol (pname stream
)
793 (declare (simple-string pname
))
794 (dotimes (index (length pname
))
795 (let ((char (schar pname index
)))
796 (write-char (char-downcase char
) stream
))))
799 ;;; READTABLE-CASE *PRINT-CASE*
800 ;;; :DOWNCASE :UPCASE
801 (defun output-uppercase-symbol (pname stream
)
802 (declare (simple-string pname
))
803 (dotimes (index (length pname
))
804 (let ((char (schar pname index
)))
805 (write-char (char-upcase char
) stream
))))
808 ;;; READTABLE-CASE *PRINT-CASE*
809 ;;; :UPCASE :CAPITALIZE
810 ;;; :DOWNCASE :CAPITALIZE
811 (defun output-capitalize-symbol (pname stream
)
812 (declare (simple-string pname
))
813 (let ((prev-not-alphanum t
)
814 (up (eq (%readtable-case
*readtable
*) :upcase
)))
815 (dotimes (i (length pname
))
816 (let ((char (char pname i
)))
818 (if (or prev-not-alphanum
(lower-case-p char
))
820 (char-downcase char
))
821 (if prev-not-alphanum
825 (setq prev-not-alphanum
(not (alphanumericp char
)))))))
828 ;;; READTABLE-CASE *PRINT-CASE*
830 (defun output-invert-symbol (pname stream
)
831 (declare (simple-string pname
))
834 (dotimes (i (length pname
))
835 (let ((ch (schar pname i
)))
836 (when (both-case-p ch
)
837 (if (upper-case-p ch
)
839 (setq all-upper nil
)))))
840 (cond (all-upper (output-lowercase-symbol pname stream
))
841 (all-lower (output-uppercase-symbol pname stream
))
843 (write-string pname stream
)))))
845 ;;; Set the internal global symbol *INTERNAL-SYMBOL-OUTPUT-FUN*
846 ;;; to the right function depending on the values of *PRINT-CASE*
847 ;;; and (%READTABLE-CASE *READTABLE*).
848 (defun setup-printer-state ()
849 (let ((readtable-case (%readtable-case
*readtable
*))
850 (print-case *print-case
*))
851 (unless (and (eq print-case
*previous-case
*)
852 (eq readtable-case
*previous-readtable-case
*))
853 (setq *previous-case
* print-case
)
854 (setq *previous-readtable-case
* readtable-case
)
855 (setq *internal-symbol-output-fun
*
856 ;; a morally equivalent reformulation of FOP-KNOWN-FUN
857 (macrolet ((load-time-fn (name) `(load-time-value #',name t
)))
861 (:upcase
(load-time-fn output-preserve-symbol
))
862 (:downcase
(load-time-fn output-lowercase-symbol
))
863 (:capitalize
(load-time-fn output-capitalize-symbol
))))
866 (:upcase
(load-time-fn output-uppercase-symbol
))
867 (:downcase
(load-time-fn output-preserve-symbol
))
868 (:capitalize
(load-time-fn output-capitalize-symbol
))))
869 (:preserve
(load-time-fn output-preserve-symbol
))
870 (:invert
(load-time-fn output-invert-symbol
))))))))
874 (let ((*readtable
* (copy-readtable nil
)))
875 (format t
"READTABLE-CASE Input Symbol-name~@
876 ----------------------------------~%")
877 (dolist (readtable-case '(:upcase
:downcase
:preserve
:invert
))
878 (setf (readtable-case *readtable
*) readtable-case
)
879 (dolist (input '("ZEBRA" "Zebra" "zebra"))
880 (format t
"~&:~A~16T~A~24T~A"
881 (string-upcase readtable-case
)
883 (symbol-name (read-from-string input
)))))))
886 (let ((*readtable
* (copy-readtable nil
)))
887 (format t
"READTABLE-CASE *PRINT-CASE* Symbol-name Output Princ~@
888 --------------------------------------------------------~%")
889 (dolist (readtable-case '(:upcase
:downcase
:preserve
:invert
))
890 (setf (readtable-case *readtable
*) readtable-case
)
891 (dolist (*print-case
* '(:upcase
:downcase
:capitalize
))
892 (dolist (symbol '(|ZEBRA| |Zebra| |zebra|
))
893 (format t
"~&:~A~15T:~A~29T~A~42T~A~50T~A"
894 (string-upcase readtable-case
)
895 (string-upcase *print-case
*)
897 (prin1-to-string symbol
)
898 (princ-to-string symbol
)))))))
901 ;;;; recursive objects
903 (defun output-list (list stream
)
904 (descend-into (stream)
905 (write-char #\
( stream
)
909 (punt-print-if-too-long length stream
)
910 (output-object (pop list
) stream
)
913 (when (or (atom list
)
914 (check-for-circularity list
))
915 (write-string " . " stream
)
916 (output-object list stream
)
918 (write-char #\space stream
)
920 (write-char #\
) stream
)))
922 (defun output-unreadable-vector-readably (vector stream
)
923 (declare (vector vector
))
924 (write-string "#." stream
)
925 (write `(coerce ,(coerce vector
'(vector t
))
926 '(simple-array ,(array-element-type vector
) (*)))
929 (defun output-vector (vector stream
)
930 (declare (vector vector
))
931 (cond ((stringp vector
)
932 (cond ((and *print-readably
*
933 (not (eq (array-element-type vector
)
936 (make-array 0 :element-type
'character
))))))
937 (print-not-readable-error vector stream
))
938 ((or *print-escape
* *print-readably
*)
939 (write-char #\" stream
)
940 (quote-string vector stream
)
941 (write-char #\" stream
))
943 (write-string vector stream
))))
944 ((not (or *print-array
* *print-readably
*))
945 (output-terse-array vector stream
))
946 ((bit-vector-p vector
)
947 (write-string "#*" stream
)
948 (dovector (bit vector
)
949 ;; (Don't use OUTPUT-OBJECT here, since this code
950 ;; has to work for all possible *PRINT-BASE* values.)
951 (write-char (if (zerop bit
) #\
0 #\
1) stream
)))
952 ((or (not *print-readably
*)
953 (array-readably-printable-p vector
))
954 (descend-into (stream)
955 (write-string "#(" stream
)
956 (dotimes (i (length vector
))
958 (write-char #\space stream
))
959 (punt-print-if-too-long i stream
)
960 (output-object (aref vector i
) stream
))
961 (write-string ")" stream
)))
963 (output-unreadable-vector-readably vector stream
))
965 (print-not-readable-error vector stream
))))
967 ;;; This function outputs a string quoting characters sufficiently
968 ;;; so that someone can read it in again. Basically, put a slash in
969 ;;; front of an character satisfying NEEDS-SLASH-P.
970 (defun quote-string (string stream
)
971 (macrolet ((needs-slash-p (char)
972 ;; KLUDGE: We probably should look at the readtable, but just do
973 ;; this for now. [noted by anonymous long ago] -- WHN 19991130
974 `(or (char= ,char
#\\)
976 (with-array-data ((data string
) (start) (end)
977 :check-fill-pointer t
)
978 (do ((index start
(1+ index
)))
980 (let ((char (schar data index
)))
981 (when (needs-slash-p char
) (write-char #\\ stream
))
982 (write-char char stream
))))))
984 (defun array-readably-printable-p (array)
985 (and (eq (array-element-type array
) t
)
986 (let ((zero (position 0 (array-dimensions array
)))
987 (number (position 0 (array-dimensions array
)
988 :test
(complement #'eql
)
990 (or (null zero
) (null number
) (> zero number
)))))
992 ;;; Output the printed representation of any array in either the #< or #A
994 (defun output-array (array stream
)
995 (if (or *print-array
* *print-readably
*)
996 (output-array-guts array stream
)
997 (output-terse-array array stream
)))
999 ;;; Output the abbreviated #< form of an array.
1000 (defun output-terse-array (array stream
)
1001 (let ((*print-level
* nil
)
1002 (*print-length
* nil
))
1003 (print-unreadable-object (array stream
:type t
:identity t
))))
1005 ;;; Convert an array into a list that can be used with MAKE-ARRAY's
1006 ;;; :INITIAL-CONTENTS keyword argument.
1007 (defun listify-array (array)
1008 (with-array-data ((data array
) (start) (end))
1009 (declare (ignore end
))
1010 (labels ((listify (dimensions index
)
1011 (if (null dimensions
)
1013 (let* ((dimension (car dimensions
))
1014 (dimensions (cdr dimensions
))
1015 (count (reduce #'* dimensions
)))
1016 (loop for i below dimension
1017 collect
(listify dimensions index
)
1018 do
(incf index count
))))))
1019 (listify (array-dimensions array
) start
))))
1021 (defun output-unreadable-array-readably (array stream
)
1022 (write-string "#." stream
)
1023 (write `(make-array ',(array-dimensions array
)
1024 :element-type
',(array-element-type array
)
1025 :initial-contents
',(listify-array array
))
1028 ;;; Output the readable #A form of an array.
1029 (defun output-array-guts (array stream
)
1030 (cond ((or (not *print-readably
*)
1031 (array-readably-printable-p array
))
1032 (write-char #\
# stream
)
1033 (let ((*print-base
* 10)
1034 (*print-radix
* nil
))
1035 (output-integer (array-rank array
) stream
))
1036 (write-char #\A stream
)
1037 (with-array-data ((data array
) (start) (end))
1038 (declare (ignore end
))
1039 (sub-output-array-guts data
(array-dimensions array
) stream start
)))
1041 (output-unreadable-array-readably array stream
))
1043 (print-not-readable-error array stream
))))
1045 (defun sub-output-array-guts (array dimensions stream index
)
1046 (declare (type (simple-array * (*)) array
) (fixnum index
))
1047 (cond ((null dimensions
)
1048 (output-object (aref array index
) stream
))
1050 (descend-into (stream)
1051 (write-char #\
( stream
)
1052 (let* ((dimension (car dimensions
))
1053 (dimensions (cdr dimensions
))
1054 (count (reduce #'* dimensions
)))
1055 (dotimes (i dimension
)
1057 (write-char #\space stream
))
1058 (punt-print-if-too-long i stream
)
1059 (sub-output-array-guts array dimensions stream index
)
1060 (incf index count
)))
1061 (write-char #\
) stream
)))))
1063 ;;; a trivial non-generic-function placeholder for PRINT-OBJECT, for
1064 ;;; use until CLOS is set up (at which time it will be replaced with
1065 ;;; the real generic function implementation)
1066 (defun print-object (instance stream
)
1067 (default-structure-print instance stream
*current-level-in-print
*))
1069 ;;;; integer, ratio, and complex printing (i.e. everything but floats)
1071 (defun %output-radix
(base stream
)
1072 (write-char #\
# stream
)
1073 (write-char (case base
1077 (t (%output-reasonable-integer-in-base base
10 stream
)
1081 (defun %output-reasonable-integer-in-base
(n base stream
)
1082 (multiple-value-bind (q r
)
1084 ;; Recurse until you have all the digits pushed on
1087 (%output-reasonable-integer-in-base q base stream
))
1088 ;; Then as each recursive call unwinds, turn the
1089 ;; digit (in remainder) into a character and output
1092 (schar "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ" r
)
1095 ;;; *POWER-CACHE* is an alist mapping bases to power-vectors. It is
1096 ;;; filled and probed by POWERS-FOR-BASE. SCRUB-POWER-CACHE is called
1097 ;;; always prior a GC to drop overly large bignums from the cache.
1099 ;;; It doesn't need a lock, but if you work on SCRUB-POWER-CACHE or
1100 ;;; POWERS-FOR-BASE, see that you don't break the assumptions!
1101 (defglobal *power-cache
* (make-array 37 :initial-element nil
))
1102 (declaim (type (simple-vector 37) *power-cache
*))
1104 (defconstant +power-cache-integer-length-limit
+ 2048)
1106 (defun scrub-power-cache (&aux
(cache *power-cache
*))
1107 (dotimes (i (length cache
))
1108 (let ((powers (aref cache i
)))
1110 (let ((too-big (position-if
1112 (>= (integer-length x
)
1113 +power-cache-integer-length-limit
+))
1114 (the simple-vector powers
))))
1116 (setf (aref cache i
) (subseq powers
0 too-big
))))))))
1118 ;;; Compute (and cache) a power vector for a BASE and LIMIT:
1119 ;;; the vector holds integers for which
1120 ;;; (aref powers k) == (expt base (expt 2 k))
1122 (defun powers-for-base (base limit
)
1123 (flet ((compute-powers (from)
1125 (do ((p from
(* p p
)))
1127 ;; We don't actually need this, but we also
1128 ;; prefer not to cons it up a second time...
1131 (nreverse powers
))))
1132 (let* ((cache *power-cache
*)
1133 (powers (aref cache base
)))
1134 (setf (aref cache base
)
1135 (concatenate 'vector powers
1138 (let* ((len (length powers
))
1139 (max (svref powers
(1- len
))))
1141 (return-from powers-for-base powers
)
1145 ;; Algorithm by Harald Hanche-Olsen, sbcl-devel 2005-02-05
1146 (defun %output-huge-integer-in-base
(n base stream
)
1147 (declare (type bignum n
) (type fixnum base
))
1148 ;; POWER is a vector for which the following holds:
1149 ;; (aref power k) == (expt base (expt 2 k))
1150 (let* ((power (powers-for-base base n
))
1151 (k-start (or (position-if (lambda (x) (> x n
)) power
)
1152 (bug "power-vector too short"))))
1153 (labels ((bisect (n k exactp
)
1154 (declare (fixnum k
))
1155 ;; N is the number to bisect
1156 ;; K on initial entry BASE^(2^K) > N
1157 ;; EXACTP is true if 2^K is the exact number of digits
1160 (loop repeat
(ash 1 k
) do
(write-char #\
0 stream
))))
1163 (schar "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ" n
)
1167 (multiple-value-bind (q r
) (truncate n
(aref power k
))
1168 ;; EXACTP is NIL only at the head of the
1169 ;; initial number, as we don't know the number
1170 ;; of digits there, but we do know that it
1171 ;; doesn't get any leading zeros.
1173 (bisect r k
(or exactp
(plusp q
))))))))
1174 (bisect n k-start nil
))))
1176 (defun %output-integer-in-base
(integer base stream
)
1177 (when (minusp integer
)
1178 (write-char #\- stream
)
1179 (setf integer
(- integer
)))
1180 ;; The ideal cutoff point between these two algorithms is almost
1181 ;; certainly quite platform dependent: this gives 87 for 32 bit
1182 ;; SBCL, which is about right at least for x86/Darwin.
1183 (if (or (fixnump integer
)
1184 (< (integer-length integer
) (* 3 sb
!vm
:n-positive-fixnum-bits
)))
1185 (%output-reasonable-integer-in-base integer base stream
)
1186 (%output-huge-integer-in-base integer base stream
)))
1188 (defun output-integer (integer stream
)
1189 (let ((base *print-base
*))
1190 (when (and (/= base
10) *print-radix
*)
1191 (%output-radix base stream
))
1192 (%output-integer-in-base integer base stream
)
1193 (when (and *print-radix
* (= base
10))
1194 (write-char #\. stream
))))
1196 (defun output-ratio (ratio stream
)
1197 (let ((base *print-base
*))
1199 (%output-radix base stream
))
1200 (%output-integer-in-base
(numerator ratio
) base stream
)
1201 (write-char #\
/ stream
)
1202 (%output-integer-in-base
(denominator ratio
) base stream
)))
1204 (defun output-complex (complex stream
)
1205 (write-string "#C(" stream
)
1206 ;; FIXME: Could this just be OUTPUT-NUMBER?
1207 (output-object (realpart complex
) stream
)
1208 (write-char #\space stream
)
1209 (output-object (imagpart complex
) stream
)
1210 (write-char #\
) stream
))
1214 ;;; FLONUM-TO-STRING (and its subsidiary function FLOAT-STRING) does
1215 ;;; most of the work for all printing of floating point numbers in
1216 ;;; FORMAT. It converts a floating point number to a string in a free
1217 ;;; or fixed format with no exponent. The interpretation of the
1218 ;;; arguments is as follows:
1220 ;;; X - The floating point number to convert, which must not be
1222 ;;; WIDTH - The preferred field width, used to determine the number
1223 ;;; of fraction digits to produce if the FDIGITS parameter
1224 ;;; is unspecified or NIL. If the non-fraction digits and the
1225 ;;; decimal point alone exceed this width, no fraction digits
1226 ;;; will be produced unless a non-NIL value of FDIGITS has been
1227 ;;; specified. Field overflow is not considerd an error at this
1229 ;;; FDIGITS - The number of fractional digits to produce. Insignificant
1230 ;;; trailing zeroes may be introduced as needed. May be
1231 ;;; unspecified or NIL, in which case as many digits as possible
1232 ;;; are generated, subject to the constraint that there are no
1233 ;;; trailing zeroes.
1234 ;;; SCALE - If this parameter is specified or non-NIL, then the number
1235 ;;; printed is (* x (expt 10 scale)). This scaling is exact,
1236 ;;; and cannot lose precision.
1237 ;;; FMIN - This parameter, if specified or non-NIL, is the minimum
1238 ;;; number of fraction digits which will be produced, regardless
1239 ;;; of the value of WIDTH or FDIGITS. This feature is used by
1240 ;;; the ~E format directive to prevent complete loss of
1241 ;;; significance in the printed value due to a bogus choice of
1245 ;;; (VALUES DIGIT-STRING DIGIT-LENGTH LEADING-POINT TRAILING-POINT DECPNT)
1246 ;;; where the results have the following interpretation:
1248 ;;; DIGIT-STRING - The decimal representation of X, with decimal point.
1249 ;;; DIGIT-LENGTH - The length of the string DIGIT-STRING.
1250 ;;; LEADING-POINT - True if the first character of DIGIT-STRING is the
1252 ;;; TRAILING-POINT - True if the last character of DIGIT-STRING is the
1254 ;;; POINT-POS - The position of the digit preceding the decimal
1255 ;;; point. Zero indicates point before first digit.
1257 ;;; NOTE: FLONUM-TO-STRING goes to a lot of trouble to guarantee
1258 ;;; accuracy. Specifically, the decimal number printed is the closest
1259 ;;; possible approximation to the true value of the binary number to
1260 ;;; be printed from among all decimal representations with the same
1261 ;;; number of digits. In free-format output, i.e. with the number of
1262 ;;; digits unconstrained, it is guaranteed that all the information is
1263 ;;; preserved, so that a properly- rounding reader can reconstruct the
1264 ;;; original binary number, bit-for-bit, from its printed decimal
1265 ;;; representation. Furthermore, only as many digits as necessary to
1266 ;;; satisfy this condition will be printed.
1268 ;;; FLOAT-DIGITS actually generates the digits for positive numbers;
1269 ;;; see below for comments.
1271 (defun flonum-to-string (x &optional width fdigits scale fmin
)
1272 (declare (type float x
))
1273 ;; FIXME: I think only FORMAT-DOLLARS calls FLONUM-TO-STRING with
1274 ;; possibly-negative X.
1276 (multiple-value-bind (e string
)
1278 (flonum-to-digits x
(min (- (+ fdigits
(or scale
0)))
1280 (if (and width
(> width
1))
1281 (let ((w (multiple-value-list
1285 (if (and scale
(minusp scale
))
1288 (f (multiple-value-list
1289 (flonum-to-digits x
(- (+ (or fmin
0)
1290 (if scale scale
0)))))))
1292 ((>= (length (cadr w
)) (length (cadr f
)))
1294 (t (values-list f
))))
1295 (flonum-to-digits x
)))
1296 (let ((e (if (zerop x
)
1298 (+ e
(or scale
0))))
1299 (stream (make-string-output-stream)))
1302 (write-string string stream
:end
(min (length string
) e
))
1303 (dotimes (i (- e
(length string
)))
1304 (write-char #\
0 stream
))
1305 (write-char #\. stream
)
1306 (write-string string stream
:start
(min (length string
) e
))
1308 (dotimes (i (- fdigits
1310 (min (length string
) e
))))
1311 (write-char #\
0 stream
))))
1313 (write-string "." stream
)
1315 (write-char #\
0 stream
))
1316 (write-string string stream
:end
(when fdigits
1317 (min (length string
)
1321 (dotimes (i (+ fdigits e
(- (length string
))))
1322 (write-char #\
0 stream
)))))
1323 (let ((string (get-output-stream-string stream
)))
1324 (values string
(length string
)
1325 (char= (char string
0) #\.
)
1326 (char= (char string
(1- (length string
))) #\.
)
1327 (position #\. string
))))))
1329 ;;; implementation of figure 1 from Burger and Dybvig, 1996. It is
1330 ;;; extended in order to handle rounding.
1332 ;;; As the implementation of the Dragon from Classic CMUCL (and
1333 ;;; previously in SBCL above FLONUM-TO-STRING) says: "DO NOT EVEN
1334 ;;; THINK OF ATTEMPTING TO UNDERSTAND THIS CODE WITHOUT READING THE
1335 ;;; PAPER!", and in this case we have to add that even reading the
1336 ;;; paper might not bring immediate illumination as CSR has attempted
1337 ;;; to turn idiomatic Scheme into idiomatic Lisp.
1339 ;;; FIXME: figure 1 from Burger and Dybvig is the unoptimized
1340 ;;; algorithm, noticeably slow at finding the exponent. Figure 2 has
1341 ;;; an improved algorithm, but CSR ran out of energy.
1343 ;;; possible extension for the enthusiastic: printing floats in bases
1344 ;;; other than base 10.
1345 (defconstant single-float-min-e
1346 (- 2 sb
!vm
:single-float-bias sb
!vm
:single-float-digits
))
1347 (defconstant double-float-min-e
1348 (- 2 sb
!vm
:double-float-bias sb
!vm
:double-float-digits
))
1350 (defconstant long-float-min-e
1351 (nth-value 1 (decode-float least-positive-long-float
)))
1353 (defun flonum-to-digits (v &optional position relativep
)
1354 (let ((print-base 10) ; B
1356 (float-digits (float-digits v
)) ; p
1357 (digit-characters "0123456789")
1360 (single-float single-float-min-e
)
1361 (double-float double-float-min-e
)
1363 (long-float long-float-min-e
))))
1364 (multiple-value-bind (f e
)
1365 (integer-decode-float v
)
1366 (let (;; FIXME: these even tests assume normal IEEE rounding
1367 ;; mode. I wonder if we should cater for non-normal?
1370 (with-push-char (:element-type base-char
)
1371 (labels ((scale (r s m
+ m-
)
1373 (s s
(* s print-base
)))
1374 ((not (or (> (+ r m
+) s
)
1375 (and high-ok
(= (+ r m
+) s
))))
1377 (r r
(* r print-base
))
1378 (m+ m
+ (* m
+ print-base
))
1379 (m- m-
(* m- print-base
)))
1380 ((not (and (plusp (- r m-
)) ; Extension to handle zero
1381 (or (< (* (+ r m
+) print-base
) s
)
1383 (= (* (+ r m
+) print-base
) s
)))))
1384 (values k
(generate r s m
+ m-
)))))))
1385 (generate (r s m
+ m-
)
1389 (setf (values d r
) (truncate (* r print-base
) s
))
1390 (setf m
+ (* m
+ print-base
))
1391 (setf m-
(* m- print-base
))
1392 (setf tc1
(or (< r m-
) (and low-ok
(= r m-
))))
1393 (setf tc2
(or (> (+ r m
+) s
)
1394 (and high-ok
(= (+ r m
+) s
))))
1397 (push-char (char digit-characters d
))
1401 ((and (not tc1
) tc2
) (1+ d
))
1402 ((and tc1
(not tc2
)) d
)
1404 (if (< (* r
2) s
) d
(1+ d
))))))
1405 (push-char (char digit-characters d
))
1406 (return-from generate
(get-pushed-string))))))
1410 (let* ((be (expt float-radix e
))
1411 (be1 (* be float-radix
)))
1412 (if (/= f
(expt float-radix
(1- float-digits
)))
1422 (/= f
(expt float-radix
(1- float-digits
))))
1424 s
(* (expt float-radix
(- e
)) 2)
1427 (setf r
(* f float-radix
2)
1428 s
(* (expt float-radix
(- 1 e
)) 2)
1433 (aver (> position
0))
1435 ;; running out of letters here
1436 (l 1 (* l print-base
)))
1437 ((>= (* s l
) (+ r m
+))
1439 (if (< (+ r
(* s
(/ (expt print-base
(- k position
)) 2)))
1440 (* s
(expt print-base k
)))
1441 (setf position
(- k position
))
1442 (setf position
(- k position
1))))))
1443 (let ((low (max m-
(/ (* s
(expt print-base position
)) 2)))
1444 (high (max m
+ (/ (* s
(expt print-base position
)) 2))))
1451 (values r s m
+ m-
))))
1452 (multiple-value-bind (r s m
+ m-
) (initialize)
1453 (scale r s m
+ m-
))))))))
1455 ;;; Given a non-negative floating point number, SCALE-EXPONENT returns
1456 ;;; a new floating point number Z in the range (0.1, 1.0] and an
1457 ;;; exponent E such that Z * 10^E is (approximately) equal to the
1458 ;;; original number. There may be some loss of precision due the
1459 ;;; floating point representation. The scaling is always done with
1460 ;;; long float arithmetic, which helps printing of lesser precisions
1461 ;;; as well as avoiding generic arithmetic.
1463 ;;; When computing our initial scale factor using EXPT, we pull out
1464 ;;; part of the computation to avoid over/under flow. When
1465 ;;; denormalized, we must pull out a large factor, since there is more
1466 ;;; negative exponent range than positive range.
1468 (eval-when (:compile-toplevel
:execute
)
1469 (setf *read-default-float-format
*
1470 #!+long-float
'long-float
#!-long-float
'double-float
))
1471 (defun scale-exponent (original-x)
1472 (let* ((x (coerce original-x
'long-float
)))
1473 (multiple-value-bind (sig exponent
) (decode-float x
)
1474 (declare (ignore sig
))
1476 (values (float 0.0e0 original-x
) 1)
1477 (let* ((ex (locally (declare (optimize (safety 0)))
1480 ;; this is the closest double float
1481 ;; to (log 2 10), but expressed so
1482 ;; that we're not vulnerable to the
1483 ;; host lisp's interpretation of
1484 ;; arithmetic. (FIXME: it turns
1485 ;; out that sbcl itself is off by 1
1486 ;; ulp in this value, which is a
1487 ;; little unfortunate.)
1490 (make-double-float 1070810131 1352628735)
1492 (error "(log 2 10) not computed")))))))
1494 (if (float-denormalized-p x
)
1496 (* x
1.0e16
(expt 10.0e0
(- (- ex
) 16)))
1498 (* x
1.0e18
(expt 10.0e0
(- (- ex
) 18)))
1499 (* x
10.0e0
(expt 10.0e0
(- (- ex
) 1))))
1500 (/ x
10.0e0
(expt 10.0e0
(1- ex
))))))
1501 (do ((d 10.0e0
(* d
10.0e0
))
1505 (do ((m 10.0e0
(* m
10.0e0
))
1509 (values (float z original-x
) ex
))
1510 (declare (long-float m
) (integer ex
))))
1511 (declare (long-float d
))))))))
1512 (eval-when (:compile-toplevel
:execute
)
1513 (setf *read-default-float-format
* 'single-float
))
1515 ;;;; entry point for the float printer
1517 ;;; the float printer as called by PRINT, PRIN1, PRINC, etc. The
1518 ;;; argument is printed free-format, in either exponential or
1519 ;;; non-exponential notation, depending on its magnitude.
1521 ;;; NOTE: When a number is to be printed in exponential format, it is
1522 ;;; scaled in floating point. Since precision may be lost in this
1523 ;;; process, the guaranteed accuracy properties of FLONUM-TO-STRING
1524 ;;; are lost. The difficulty is that FLONUM-TO-STRING performs
1525 ;;; extensive computations with integers of similar magnitude to that
1526 ;;; of the number being printed. For large exponents, the bignums
1527 ;;; really get out of hand. If bignum arithmetic becomes reasonably
1528 ;;; fast and the exponent range is not too large, then it might become
1529 ;;; attractive to handle exponential notation with the same accuracy
1530 ;;; as non-exponential notation, using the method described in the
1531 ;;; Steele and White paper.
1533 ;;; NOTE II: this has been bypassed slightly by implementing Burger
1534 ;;; and Dybvig, 1996. When someone has time (KLUDGE) they can
1535 ;;; probably (a) implement the optimizations suggested by Burger and
1536 ;;; Dyvbig, and (b) remove all vestiges of Dragon4, including from
1537 ;;; fixed-format printing.
1539 ;;; Print the appropriate exponent marker for X and the specified exponent.
1540 (defun print-float-exponent (x exp stream
)
1541 (declare (type float x
) (type integer exp
) (type stream stream
))
1542 (let ((*print-radix
* nil
))
1543 (if (typep x
*read-default-float-format
*)
1545 (format stream
"e~D" exp
))
1546 (format stream
"~C~D"
1554 (defun output-float-infinity (x stream
)
1555 (declare (float x
) (stream stream
))
1557 (write-string "#." stream
))
1559 (return-from output-float-infinity
1560 (print-not-readable-error x stream
)))
1562 (write-string "#<" stream
)))
1563 (write-string "SB-EXT:" stream
)
1564 (write-string (symbol-name (float-format-name x
)) stream
)
1565 (write-string (if (plusp x
) "-POSITIVE-" "-NEGATIVE-")
1567 (write-string "INFINITY" stream
)
1569 (write-string ">" stream
)))
1571 (defun output-float-nan (x stream
)
1572 (print-unreadable-object (x stream
)
1573 (princ (float-format-name x
) stream
)
1574 (write-string (if (float-trapping-nan-p x
) " trapping" " quiet") stream
)
1575 (write-string " NaN" stream
)))
1577 ;;; the function called by OUTPUT-OBJECT to handle floats
1578 (defun output-float (x stream
)
1580 ((float-infinity-p x
)
1581 (output-float-infinity x stream
))
1583 (output-float-nan x stream
))
1585 (let ((x (cond ((minusp (float-sign x
))
1586 (write-char #\- stream
)
1592 (write-string "0.0" stream
)
1593 (print-float-exponent x
0 stream
))
1595 (output-float-aux x stream -
3 8)))))))
1597 (defun output-float-aux (x stream e-min e-max
)
1598 (multiple-value-bind (e string
)
1599 (flonum-to-digits x
)
1604 (write-string string stream
:end
(min (length string
) e
))
1605 (dotimes (i (- e
(length string
)))
1606 (write-char #\
0 stream
))
1607 (write-char #\. stream
)
1608 (write-string string stream
:start
(min (length string
) e
))
1609 (when (<= (length string
) e
)
1610 (write-char #\
0 stream
))
1611 (print-float-exponent x
0 stream
))
1613 (write-string "0." stream
)
1615 (write-char #\
0 stream
))
1616 (write-string string stream
)
1617 (print-float-exponent x
0 stream
))))
1618 (t (write-string string stream
:end
1)
1619 (write-char #\. stream
)
1620 (write-string string stream
:start
1)
1621 (print-float-exponent x
(1- e
) stream
)))))
1623 ;;;; other leaf objects
1625 ;;; If *PRINT-ESCAPE* is false, just do a WRITE-CHAR, otherwise output
1626 ;;; the character name or the character in the #\char format.
1627 (defun output-character (char stream
)
1628 (if (or *print-escape
* *print-readably
*)
1629 (let ((graphicp (and (graphic-char-p char
)
1630 (standard-char-p char
)))
1631 (name (char-name char
)))
1632 (write-string "#\\" stream
)
1633 (if (and name
(or (not graphicp
) *print-readably
*))
1634 (quote-string name stream
)
1635 (write-char char stream
)))
1636 (write-char char stream
)))
1638 (defun output-sap (sap stream
)
1639 (declare (type system-area-pointer sap
))
1641 (format stream
"#.(~S #X~8,'0X)" 'int-sap
(sap-int sap
)))
1643 (print-unreadable-object (sap stream
)
1644 (format stream
"system area pointer: #X~8,'0X" (sap-int sap
))))))
1646 (defun output-weak-pointer (weak-pointer stream
)
1647 (declare (type weak-pointer weak-pointer
))
1648 (print-unreadable-object (weak-pointer stream
)
1649 (multiple-value-bind (value validp
) (weak-pointer-value weak-pointer
)
1651 (write-string "weak pointer: " stream
)
1652 (write value
:stream stream
))
1654 (write-string "broken weak pointer" stream
))))))
1656 (defun output-code-component (component stream
)
1657 (print-unreadable-object (component stream
:identity t
)
1658 (let ((dinfo (%code-debug-info component
)))
1659 (cond ((eq dinfo
:bogus-lra
)
1660 (write-string "bogus code object" stream
))
1662 (write-string "code object" stream
)
1664 (write-char #\space stream
)
1665 (output-object (sb!c
::debug-info-name dinfo
) stream
)))))))
1667 (defun output-lra (lra stream
)
1668 (print-unreadable-object (lra stream
:identity t
)
1669 (write-string "return PC object" stream
)))
1671 (defun output-fdefn (fdefn stream
)
1672 (print-unreadable-object (fdefn stream
)
1673 (write-string "FDEFINITION for " stream
)
1674 ;; It's somewhat unhelpful to print as <FDEFINITION for (SETF #)>
1675 ;; Generalized function names are indivisible.
1676 (let ((name (fdefn-name fdefn
)))
1678 (output-object name stream
)
1679 ;; This needn't protect against improper lists.
1680 ;; (You'd get crashes in INTERNAL-NAME-P and other places)
1681 (format stream
"(~{~S~^ ~})" name
)))))
1683 ;;; Making this a DEFMETHOD defers its compilation until after the inline
1684 ;;; functions %SIMD-PACK-{SINGLES,DOUBLES,UB64S} get defined.
1686 (defmethod print-object ((pack simd-pack
) stream
)
1687 (cond ((and *print-readably
* *read-eval
*)
1688 (multiple-value-bind (format maker extractor
)
1690 ((simd-pack double-float
)
1691 (values "#.(~S ~S ~S)"
1692 '%make-simd-pack-double
#'%simd-pack-doubles
))
1693 ((simd-pack single-float
)
1694 (values "#.(~S ~S ~S ~S ~S)"
1695 '%make-simd-pack-single
#'%simd-pack-singles
))
1697 (values "#.(~S #X~16,'0X #X~16,'0X)"
1698 '%make-simd-pack-ub64
#'%simd-pack-ub64s
)))
1699 (multiple-value-call
1700 #'format stream format maker
(funcall extractor pack
))))
1702 (print-unreadable-object (pack stream
)
1703 (flet ((all-ones-p (value start end
&aux
(mask (- (ash 1 end
) (ash 1 start
))))
1704 (= (logand value mask
) mask
))
1705 (split-num (value start
)
1708 and v
= (ash value
(- start
)) then
(ash v -
8)
1709 collect
(logand v
#xFF
))))
1710 (multiple-value-bind (low high
)
1711 (%simd-pack-ub64s pack
)
1713 ((simd-pack double-float
)
1714 (multiple-value-bind (v0 v1
) (%simd-pack-doubles pack
)
1715 (format stream
"~S~@{ ~:[~,13E~;~*TRUE~]~}"
1717 (all-ones-p low
0 64) v0
1718 (all-ones-p high
0 64) v1
)))
1719 ((simd-pack single-float
)
1720 (multiple-value-bind (v0 v1 v2 v3
) (%simd-pack-singles pack
)
1721 (format stream
"~S~@{ ~:[~,7E~;~*TRUE~]~}"
1723 (all-ones-p low
0 32) v0
1724 (all-ones-p low
32 64) v1
1725 (all-ones-p high
0 32) v2
1726 (all-ones-p high
32 64) v3
)))
1728 (format stream
"~S~@{ ~{ ~2,'0X~}~}"
1730 (split-num low
0) (split-num low
32)
1731 (split-num high
0) (split-num high
32))))))))))
1735 ;;; Output OBJECT as using PRINT-OBJECT if it's a
1736 ;;; FUNCALLABLE-STANDARD-CLASS, or return NIL otherwise.
1738 ;;; The definition here is a simple temporary placeholder. It will be
1739 ;;; overwritten by a smarter version (capable of calling generic
1740 ;;; PRINT-OBJECT when appropriate) when CLOS is installed.
1741 (defun printed-as-funcallable-standard-class (object stream
)
1742 (declare (ignore object stream
))
1745 (defun output-fun (object stream
)
1746 (let* ((name (%fun-name object
))
1747 (proper-name-p (and (legal-fun-name-p name
) (fboundp name
)
1748 (eq (fdefinition name
) object
))))
1749 (print-unreadable-object (object stream
:identity
(not proper-name-p
))
1750 (format stream
"~:[FUNCTION~;CLOSURE~]~@[ ~S~]"
1754 ;;;; catch-all for unknown things
1756 (defun output-random (object stream
)
1757 (print-unreadable-object (object stream
:identity t
)
1758 (let ((lowtag (lowtag-of object
)))
1760 (#.sb
!vm
:other-pointer-lowtag
1761 (let ((widetag (widetag-of object
)))
1763 (#.sb
!vm
:value-cell-header-widetag
1764 (write-string "value cell " stream
)
1765 (output-object (value-cell-ref object
) stream
))
1767 (write-string "unknown pointer object, widetag=" stream
)
1768 (let ((*print-base
* 16) (*print-radix
* t
))
1769 (output-integer widetag stream
))))))
1770 ((#.sb
!vm
:fun-pointer-lowtag
1771 #.sb
!vm
:instance-pointer-lowtag
1772 #.sb
!vm
:list-pointer-lowtag
)
1773 (write-string "unknown pointer object, lowtag=" stream
)
1774 (let ((*print-base
* 16) (*print-radix
* t
))
1775 (output-integer lowtag stream
)))
1777 (case (widetag-of object
)
1778 (#.sb
!vm
:unbound-marker-widetag
1779 (write-string "unbound marker" stream
))
1781 (write-string "unknown immediate object, lowtag=" stream
)
1782 (let ((*print-base
* 2) (*print-radix
* t
))
1783 (output-integer lowtag stream
))
1784 (write-string ", widetag=" stream
)
1785 (let ((*print-base
* 16) (*print-radix
* t
))
1786 (output-integer (widetag-of object
) stream
)))))))))