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 ;;; FIXME: Many of these have nontrivial types, e.g. *PRINT-LEVEL*,
17 ;;; *PRINT-LENGTH*, and *PRINT-LINES* are (OR NULL UNSIGNED-BYTE).
19 (!defvar
*print-readably
* nil
21 "If true, all objects will be printed readably. If readable printing
22 is impossible, an error will be signalled. This overrides the value of
24 (!defvar
*print-escape
* t
26 "Should we print in a reasonably machine-readable way? (possibly
27 overridden by *PRINT-READABLY*)")
28 (!defvar
*print-pretty
* nil
; (set later when pretty-printer is initialized)
30 "Should pretty printing be used?")
31 (!defvar
*print-base
* 10.
33 "The output base for RATIONALs (including integers).")
34 (!defvar
*print-radix
* nil
36 "Should base be verified when printing RATIONALs?")
37 (!defvar
*print-level
* nil
39 "How many levels should be printed before abbreviating with \"#\"?")
40 (!defvar
*print-length
* nil
42 "How many elements at any level should be printed before abbreviating
44 (!defvar
*print-circle
* nil
46 "Should we use #n= and #n# notation to preserve uniqueness in general (and
47 circularity in particular) when printing?")
48 (!defvar
*print-case
* :upcase
50 "What case should the printer should use default?")
51 (!defvar
*print-array
* t
53 "Should the contents of arrays be printed?")
54 (!defvar
*print-gensym
* t
56 "Should #: prefixes be used when printing symbols with null SYMBOL-PACKAGE?")
57 (defvar *print-lines
* nil
59 "The maximum number of lines to print per object.")
60 (defvar *print-right-margin
* nil
62 "The position of the right margin in ems (for pretty-printing).")
63 (defvar *print-miser-width
* nil
65 "If the remaining space between the current column and the right margin
66 is less than this, then print using ``miser-style'' output. Miser
67 style conditional newlines are turned on, and all indentations are
68 turned off. If NIL, never use miser mode.")
69 (defvar *print-pprint-dispatch
*)
71 (setf (fdocumentation '*print-pprint-dispatch
* 'variable
)
72 "The pprint-dispatch-table that controls how to pretty-print objects.")
73 (!defvar
*suppress-print-errors
* nil
75 "Suppress printer errors when the condition is of the type designated by this
76 variable: an unreadable object representing the error is printed instead.")
78 (defmacro with-standard-io-syntax
(&body body
)
80 "Bind the reader and printer control variables to values that enable READ
81 to reliably read the results of PRINT. These values are:
83 *PACKAGE* the COMMON-LISP-USER package
93 *PRINT-MISER-WIDTH* NIL
94 *PRINT-PPRINT-DISPATCH* the standard pprint dispatch table
98 *PRINT-RIGHT-MARGIN* NIL
100 *READ-DEFAULT-FLOAT-FORMAT* SINGLE-FLOAT
103 *READTABLE* the standard readtable
104 SB-EXT:*SUPPRESS-PRINT-ERRORS* NIL
106 `(%with-standard-io-syntax
(lambda () ,@body
)))
108 ;; duplicate defglobal because this file is compiled before "reader"
109 (defglobal *standard-readtable
* nil
)
110 (defun %with-standard-io-syntax
(function)
111 (declare (type function function
))
112 (let ((*package
* (find-package "COMMON-LISP-USER"))
115 (*print-case
* :upcase
)
122 (*print-miser-width
* nil
)
123 (*print-pprint-dispatch
* sb
!pretty
::*standard-pprint-dispatch-table
*)
127 (*print-right-margin
* nil
)
129 (*read-default-float-format
* 'single-float
)
131 (*read-suppress
* nil
)
132 (*readtable
* *standard-readtable
*)
133 (*suppress-print-errors
* nil
))
136 ;;;; routines to print objects
139 ;;; keyword variables shared by WRITE and WRITE-TO-STRING, and
140 ;;; the bindings they map to.
141 (eval-when (:compile-toplevel
:load-toplevel
)
142 (defvar *printer-keyword-variables
*
143 '(:escape
*print-escape
*
146 :circle
*print-circle
*
147 :pretty
*print-pretty
*
149 :length
*print-length
*
152 :gensym
*print-gensym
*
153 :readably
*print-readably
*
154 :right-margin
*print-right-margin
*
155 :miser-width
*print-miser-width
*
157 :pprint-dispatch
*print-pprint-dispatch
*
158 :suppress-errors
*suppress-print-errors
*)))
160 (defun write (object &key
161 ((:stream stream
) *standard-output
*)
162 ((:escape
*print-escape
*) *print-escape
*)
163 ((:radix
*print-radix
*) *print-radix
*)
164 ((:base
*print-base
*) *print-base
*)
165 ((:circle
*print-circle
*) *print-circle
*)
166 ((:pretty
*print-pretty
*) *print-pretty
*)
167 ((:level
*print-level
*) *print-level
*)
168 ((:length
*print-length
*) *print-length
*)
169 ((:case
*print-case
*) *print-case
*)
170 ((:array
*print-array
*) *print-array
*)
171 ((:gensym
*print-gensym
*) *print-gensym
*)
172 ((:readably
*print-readably
*) *print-readably
*)
173 ((:right-margin
*print-right-margin
*)
174 *print-right-margin
*)
175 ((:miser-width
*print-miser-width
*)
177 ((:lines
*print-lines
*) *print-lines
*)
178 ((:pprint-dispatch
*print-pprint-dispatch
*)
179 *print-pprint-dispatch
*)
180 ((:suppress-errors
*suppress-print-errors
*)
181 *suppress-print-errors
*))
183 "Output OBJECT to the specified stream, defaulting to *STANDARD-OUTPUT*."
184 (output-object object
(out-synonym-of stream
))
187 ;;; Optimize common case of constant keyword arguments
188 (define-compiler-macro write
(&whole form object
&rest keys
)
192 ;; Odd number of keys, punt
194 (return-from write form
)))
195 (let* ((key (pop keys
))
197 (variable (or (getf *printer-keyword-variables
* key
)
198 (when (eq :stream key
)
200 (return-from write form
))))
201 (when (assoc variable bind
)
202 ;; First key has precedence, but we still need to execute the
203 ;; argument, and in the right order.
204 (setf variable
(gensym "IGNORE"))
205 (push variable ignore
))
206 (push (list variable value
) bind
)))
207 (unless (assoc 'stream bind
)
208 (push (list 'stream
'*standard-output
*) bind
))
209 (once-only ((object object
))
210 `(let ,(nreverse bind
)
211 ,@(when ignore
`((declare (ignore ,@ignore
))))
212 (output-object ,object
(out-synonym-of stream
))
215 (defun prin1 (object &optional stream
)
217 "Output a mostly READable printed representation of OBJECT on the specified
219 (let ((*print-escape
* t
))
220 (output-object object
(out-synonym-of stream
)))
223 (defun princ (object &optional stream
)
225 "Output an aesthetic but not necessarily READable printed representation
226 of OBJECT on the specified STREAM."
227 (let ((*print-escape
* nil
)
228 (*print-readably
* nil
))
229 (output-object object
(out-synonym-of stream
)))
232 (defun print (object &optional stream
)
234 "Output a newline, the mostly READable printed representation of OBJECT, and
235 space to the specified STREAM."
236 (let ((stream (out-synonym-of stream
)))
238 (prin1 object stream
)
239 (write-char #\space stream
)
242 (defun pprint (object &optional stream
)
244 "Prettily output OBJECT preceded by a newline."
245 (let ((*print-pretty
* t
)
247 (stream (out-synonym-of stream
)))
249 (output-object object stream
))
252 (defun write-to-string
254 ((:escape
*print-escape
*) *print-escape
*)
255 ((:radix
*print-radix
*) *print-radix
*)
256 ((:base
*print-base
*) *print-base
*)
257 ((:circle
*print-circle
*) *print-circle
*)
258 ((:pretty
*print-pretty
*) *print-pretty
*)
259 ((:level
*print-level
*) *print-level
*)
260 ((:length
*print-length
*) *print-length
*)
261 ((:case
*print-case
*) *print-case
*)
262 ((:array
*print-array
*) *print-array
*)
263 ((:gensym
*print-gensym
*) *print-gensym
*)
264 ((:readably
*print-readably
*) *print-readably
*)
265 ((:right-margin
*print-right-margin
*) *print-right-margin
*)
266 ((:miser-width
*print-miser-width
*) *print-miser-width
*)
267 ((:lines
*print-lines
*) *print-lines
*)
268 ((:pprint-dispatch
*print-pprint-dispatch
*)
269 *print-pprint-dispatch
*)
270 ((:suppress-errors
*suppress-print-errors
*)
271 *suppress-print-errors
*))
273 "Return the printed representation of OBJECT as a string."
274 (stringify-object object
))
276 ;;; Optimize common case of constant keyword arguments
277 (define-compiler-macro write-to-string
(&whole form object
&rest keys
)
281 ;; Odd number of keys, punt
283 (return-from write-to-string form
)))
284 (let* ((key (pop keys
))
286 (variable (or (getf *printer-keyword-variables
* key
)
287 (return-from write-to-string form
))))
288 (when (assoc variable bind
)
289 ;; First key has precedence, but we still need to execute the
290 ;; argument, and in the right order.
291 (setf variable
(gensym "IGNORE"))
292 (push variable ignore
))
293 (push (list variable value
) bind
)))
295 (once-only ((object object
))
296 `(let ,(nreverse bind
)
297 ,@(when ignore
`((declare (ignore ,@ignore
))))
298 (stringify-object ,object
)))
299 `(stringify-object ,object
))))
301 (defun prin1-to-string (object)
303 "Return the printed representation of OBJECT as a string with
305 (let ((*print-escape
* t
))
306 (stringify-object object
)))
308 (defun princ-to-string (object)
310 "Return the printed representation of OBJECT as a string with
312 (let ((*print-escape
* nil
)
313 (*print-readably
* nil
))
314 (stringify-object object
)))
316 ;;; This produces the printed representation of an object as a string.
317 ;;; The few ...-TO-STRING functions above call this.
318 (defun stringify-object (object)
319 (let ((stream (make-string-output-stream)))
320 (setup-printer-state)
321 (output-object object stream
)
322 (get-output-stream-string stream
)))
324 ;;;; support for the PRINT-UNREADABLE-OBJECT macro
326 (defun print-not-readable-error (object stream
)
328 (error 'print-not-readable
:object object
)
330 :report
"Print unreadably."
331 (let ((*print-readably
* nil
))
332 (output-object object stream
)
335 :report
"Supply an object to be printed instead."
338 (read-evaluated-form "~@<Enter an object (evaluated): ~@:>"))
339 (output-object o stream
)
342 ;;; guts of PRINT-UNREADABLE-OBJECT
343 (defun %print-unreadable-object
(object stream type identity
&optional body
)
344 (declare (type (or null function
) body
))
346 (print-not-readable-error object stream
)
347 (flet ((print-description ()
349 (write (type-of object
) :stream stream
:circle nil
350 :level nil
:length nil
)
351 (write-char #\space stream
)
352 (pprint-newline :fill stream
))
356 (when (or body
(not type
))
357 (write-char #\space stream
))
358 (pprint-newline :fill stream
)
359 (write-char #\
{ stream
)
360 (write (get-lisp-obj-address object
) :stream stream
362 (write-char #\
} stream
))))
363 (cond ((print-pretty-on-stream-p stream
)
364 ;; Since we're printing prettily on STREAM, format the
365 ;; object within a logical block. PPRINT-LOGICAL-BLOCK does
366 ;; not rebind the stream when it is already a pretty stream,
367 ;; so output from the body will go to the same stream.
368 (pprint-logical-block (stream nil
:prefix
"#<" :suffix
">")
369 (print-description)))
371 (write-string "#<" stream
)
373 (write-char #\
> stream
)))))
376 ;;;; OUTPUT-OBJECT -- the main entry point
378 ;;; Objects whose print representation identifies them EQLly don't
379 ;;; need to be checked for circularity.
380 (defun uniquely-identified-by-print-p (x)
384 (symbol-package x
))))
386 (defvar *in-print-error
* nil
)
388 ;;; Output OBJECT to STREAM observing all printer control variables.
389 (defun output-object (object stream
)
390 (labels ((print-it (stream)
392 (sb!pretty
:output-pretty-object object stream
)
393 (output-ugly-object object stream
)))
395 (if *suppress-print-errors
*
396 (handler-bind ((condition
397 (lambda (condition) nil
398 (when (typep condition
*suppress-print-errors
*)
399 (cond (*in-print-error
*
400 (write-string "(error printing " stream
)
401 (write-string *in-print-error
* stream
)
402 (write-string ")" stream
))
404 ;; Give outer handlers a chance.
406 (continue "Suppress the error.")
408 (let ((*print-readably
* nil
)
411 "#<error printing a " stream
)
412 (let ((*in-print-error
* "type"))
413 (output-object (type-of object
) stream
))
414 (write-string ": " stream
)
415 (let ((*in-print-error
* "condition"))
416 (output-object condition stream
))
417 (write-string ">" stream
))))
418 (return-from handle-it object
)))))
422 (multiple-value-bind (marker initiate
)
423 (check-for-circularity object t
)
424 (if (eq initiate
:initiate
)
425 (let ((*circularity-hash-table
*
426 (make-hash-table :test
'eq
)))
427 (check-it (make-broadcast-stream))
428 (let ((*circularity-counter
* 0))
432 (when (handle-circularity marker stream
)
434 (handle-it stream
))))))
435 (cond (;; Maybe we don't need to bother with circularity detection.
436 (or (not *print-circle
*)
437 (uniquely-identified-by-print-p object
))
439 (;; If we have already started circularity detection, this
440 ;; object might be a shared reference. If we have not, then
441 ;; if it is a compound object it might contain a circular
442 ;; reference to itself or multiple shared references.
443 (or *circularity-hash-table
*
444 (compound-object-p object
))
447 (handle-it stream
)))))
449 ;;; a hack to work around recurring gotchas with printing while
450 ;;; DEFGENERIC PRINT-OBJECT is being built
452 ;;; (hopefully will go away naturally when CLOS moves into cold init)
453 (defvar *print-object-is-disabled-p
*)
455 ;;; Output OBJECT to STREAM observing all printer control variables
456 ;;; except for *PRINT-PRETTY*. Note: if *PRINT-PRETTY* is non-NIL,
457 ;;; then the pretty printer will be used for any components of OBJECT,
458 ;;; just not for OBJECT itself.
459 (defun output-ugly-object (object stream
)
461 ;; KLUDGE: The TYPECASE approach here is non-ANSI; the ANSI definition of
462 ;; PRINT-OBJECT says it provides printing and we're supposed to provide
463 ;; PRINT-OBJECT methods covering all classes. We deviate from this
464 ;; by using PRINT-OBJECT only when we print instance values. However,
465 ;; ANSI makes it hard to tell that we're deviating from this:
466 ;; (1) ANSI specifies that the user isn't supposed to call PRINT-OBJECT
468 ;; (2) ANSI (section 11.1.2.1.2) says it's undefined to define
469 ;; a method on an external symbol in the CL package which is
470 ;; applicable to arg lists containing only direct instances of
471 ;; standardized classes.
472 ;; Thus, in order for the user to detect our sleaziness in conforming
473 ;; code, he has to do something relatively obscure like
474 ;; (1) actually use tools like FIND-METHOD to look for PRINT-OBJECT
476 ;; (2) define a PRINT-OBJECT method which is specialized on the stream
477 ;; value (e.g. a Gray stream object).
478 ;; As long as no one comes up with a non-obscure way of detecting this
479 ;; sleaziness, fixing this nonconformity will probably have a low
480 ;; priority. -- WHN 2001-11-25
483 (output-symbol object stream
)
484 (output-list object stream
)))
486 ;; The first case takes the above idea one step further: If an instance
487 ;; isn't a citizen yet, it has no right to a print-object method.
488 (cond ((sb!kernel
::undefined-classoid-p
(layout-classoid (layout-of object
)))
489 ;; not only is this unreadable, it's unprintable too.
490 (print-unreadable-object (object stream
:identity t
)
491 (format stream
"UNPRINTABLE instance of ~W"
492 (layout-classoid (layout-of object
)))))
493 ((not (and (boundp '*print-object-is-disabled-p
*)
494 *print-object-is-disabled-p
*))
495 (print-object object stream
))
496 ((typep object
'structure-object
)
497 (default-structure-print object stream
*current-level-in-print
*))
499 (write-string "#<INSTANCE but not STRUCTURE-OBJECT>" stream
))))
500 (funcallable-instance
502 ((not (and (boundp '*print-object-is-disabled-p
*)
503 *print-object-is-disabled-p
*))
504 (print-object object stream
))
505 (t (output-fun object stream
))))
507 (output-fun object stream
))
509 (output-symbol object stream
))
513 (output-integer object stream
))
515 (output-float object stream
))
517 (output-ratio object stream
))
519 (output-complex object stream
))))
521 (output-character object stream
))
523 (output-vector object stream
))
525 (output-array object stream
))
527 (output-sap object stream
))
529 (output-weak-pointer object stream
))
531 (output-lra object stream
))
533 (output-code-component object stream
))
535 (output-fdefn object stream
))
538 (output-simd-pack object stream
))
540 (output-random object stream
))))
544 ;;; values of *PRINT-CASE* and (READTABLE-CASE *READTABLE*) the last
545 ;;; time the printer was called
546 (defvar *previous-case
* nil
)
547 (defvar *previous-readtable-case
* nil
)
549 ;;; This variable contains the current definition of one of three
550 ;;; symbol printers. SETUP-PRINTER-STATE sets this variable.
551 (defvar *internal-symbol-output-fun
* nil
)
553 ;;; This function sets the internal global symbol
554 ;;; *INTERNAL-SYMBOL-OUTPUT-FUN* to the right function depending on
555 ;;; the value of *PRINT-CASE*. See the manual for details. The print
556 ;;; buffer stream is also reset.
557 (defun setup-printer-state ()
558 (unless (and (eq *print-case
* *previous-case
*)
559 (eq (readtable-case *readtable
*) *previous-readtable-case
*))
560 (setq *previous-case
* *print-case
*)
561 (setq *previous-readtable-case
* (readtable-case *readtable
*))
562 (unless (member *print-case
* '(:upcase
:downcase
:capitalize
))
563 (setq *print-case
* :upcase
)
564 (error "invalid *PRINT-CASE* value: ~S" *previous-case
*))
565 (unless (member *previous-readtable-case
*
566 '(:upcase
:downcase
:invert
:preserve
))
567 (setf (readtable-case *readtable
*) :upcase
)
568 (error "invalid READTABLE-CASE value: ~S" *previous-readtable-case
*))
570 (setq *internal-symbol-output-fun
*
571 (case *previous-readtable-case
*
574 (:upcase
#'output-preserve-symbol
)
575 (:downcase
#'output-lowercase-symbol
)
576 (:capitalize
#'output-capitalize-symbol
)))
579 (:upcase
#'output-uppercase-symbol
)
580 (:downcase
#'output-preserve-symbol
)
581 (:capitalize
#'output-capitalize-symbol
)))
582 (:preserve
#'output-preserve-symbol
)
583 (:invert
#'output-invert-symbol
)))))
585 ;;; Output PNAME (a symbol-name or package-name) surrounded with |'s,
586 ;;; and with any embedded |'s or \'s escaped.
587 (defun output-quoted-symbol-name (pname stream
)
588 (declare (string pname
))
589 (write-char #\| stream
)
590 (dotimes (index (length pname
))
591 (let ((char (schar pname index
)))
592 (when (or (char= char
#\\) (char= char
#\|
))
593 (write-char #\\ stream
))
594 (write-char char stream
)))
595 (write-char #\| stream
))
597 (defun output-symbol (object stream
)
598 (if (or *print-escape
* *print-readably
*)
599 (let ((package (symbol-package object
))
600 (name (symbol-name object
))
601 (current (sane-package)))
603 ;; The ANSI spec "22.1.3.3.1 Package Prefixes for Symbols"
604 ;; requires that keywords be printed with preceding colons
605 ;; always, regardless of the value of *PACKAGE*.
606 ((eq package
*keyword-package
*)
607 (write-char #\
: stream
))
608 ;; Otherwise, if the symbol's home package is the current
609 ;; one, then a prefix is never necessary.
610 ((eq package current
))
611 ;; Uninterned symbols print with a leading #:.
613 (when (or *print-gensym
* *print-readably
*)
614 (write-string "#:" stream
)))
616 (multiple-value-bind (symbol accessible
)
617 (find-symbol name current
)
618 ;; If we can find the symbol by looking it up, it need not
619 ;; be qualified. This can happen if the symbol has been
620 ;; inherited from a package other than its home package.
622 ;; To preserve print-read consistency, use the local nickname if
624 (unless (and accessible
(eq symbol object
))
625 (let ((prefix (or (car (rassoc package
(package-%local-nicknames current
)))
626 (package-name package
))))
627 (output-symbol-name prefix stream
))
628 (if (nth-value 1 (find-external-symbol name package
))
629 (write-char #\
: stream
)
630 (write-string "::" stream
))))))
631 (output-symbol-name name stream
))
632 (output-symbol-name (symbol-name object
) stream nil
)))
634 ;;; Output the string NAME as if it were a symbol name. In other
635 ;;; words, diddle its case according to *PRINT-CASE* and
637 (defun output-symbol-name (name stream
&optional
(maybe-quote t
))
638 (declare (type simple-string name
))
639 (let ((*readtable
* (if *print-readably
* *standard-readtable
* *readtable
*)))
640 (setup-printer-state)
641 (if (and maybe-quote
(or
642 (and (readtable-normalization *readtable
*)
643 (not (sb!unicode
:normalized-p name
:nfkc
)))
644 (symbol-quotep name
)))
645 (output-quoted-symbol-name name stream
)
646 (funcall *internal-symbol-output-fun
* name stream
))))
648 ;;;; escaping symbols
650 ;;; When we print symbols we have to figure out if they need to be
651 ;;; printed with escape characters. This isn't a whole lot easier than
652 ;;; reading symbols in the first place.
654 ;;; For each character, the value of the corresponding element is a
655 ;;; fixnum with bits set corresponding to attributes that the
656 ;;; character has. At characters have at least one bit set, so we can
657 ;;; search for any character with a positive test.
658 (defvar *character-attributes
*
659 (make-array 160 ; FIXME
660 :element-type
'(unsigned-byte 16)
662 (declaim (type (simple-array (unsigned-byte 16) (#.160)) ; FIXME
663 *character-attributes
*))
665 ;;; constants which are a bit-mask for each interesting character attribute
666 (defconstant other-attribute
(ash 1 0)) ; Anything else legal.
667 (defconstant number-attribute
(ash 1 1)) ; A numeric digit.
668 (defconstant uppercase-attribute
(ash 1 2)) ; An uppercase letter.
669 (defconstant lowercase-attribute
(ash 1 3)) ; A lowercase letter.
670 (defconstant sign-attribute
(ash 1 4)) ; +-
671 (defconstant extension-attribute
(ash 1 5)) ; ^_
672 (defconstant dot-attribute
(ash 1 6)) ; .
673 (defconstant slash-attribute
(ash 1 7)) ; /
674 (defconstant funny-attribute
(ash 1 8)) ; Anything illegal.
676 (eval-when (:compile-toplevel
:load-toplevel
:execute
)
678 ;;; LETTER-ATTRIBUTE is a local of SYMBOL-QUOTEP. It matches letters
679 ;;; that don't need to be escaped (according to READTABLE-CASE.)
680 (defparameter *attribute-names
*
681 `((number . number-attribute
) (lowercase . lowercase-attribute
)
682 (uppercase . uppercase-attribute
) (letter . letter-attribute
)
683 (sign . sign-attribute
) (extension . extension-attribute
)
684 (dot . dot-attribute
) (slash . slash-attribute
)
685 (other . other-attribute
) (funny . funny-attribute
)))
689 ;;; For each character, the value of the corresponding element is the
690 ;;; lowest base in which that character is a digit.
691 (declaim (type (simple-array (unsigned-byte 8) (128)) ; FIXME: range?
693 (defvar *digit-bases
*
694 (make-array 128 ; FIXME
695 :element-type
'(unsigned-byte 8)))
697 (defun !printer-cold-init
()
698 (setq *digit-bases
* (make-array 128 ; FIXME
699 :element-type
'(unsigned-byte 8)
701 *character-attributes
* (make-array 160 ; FIXME
702 :element-type
'(unsigned-byte 16)
705 (let ((char (digit-char i
36)))
706 (setf (aref *digit-bases
* (char-code char
)) i
)))
708 (flet ((set-bit (char bit
)
709 (let ((code (char-code char
)))
710 (setf (aref *character-attributes
* code
)
711 (logior bit
(aref *character-attributes
* code
))))))
713 (dolist (char '(#\
! #\
@ #\$
#\%
#\
& #\
* #\
= #\~
#\
[ #\
] #\
{ #\
}
715 (set-bit char other-attribute
))
718 (set-bit (digit-char i
) number-attribute
))
720 (do ((code (char-code #\A
) (1+ code
))
721 (end (char-code #\Z
)))
723 (declare (fixnum code end
))
724 (set-bit (code-char code
) uppercase-attribute
)
725 (set-bit (char-downcase (code-char code
)) lowercase-attribute
))
727 (set-bit #\- sign-attribute
)
728 (set-bit #\
+ sign-attribute
)
729 (set-bit #\^ extension-attribute
)
730 (set-bit #\_ extension-attribute
)
731 (set-bit #\. dot-attribute
)
732 (set-bit #\
/ slash-attribute
)
734 ;; Mark anything not explicitly allowed as funny.
735 (dotimes (i 160) ; FIXME
736 (when (zerop (aref *character-attributes
* i
))
737 (setf (aref *character-attributes
* i
) funny-attribute
))))
738 ) ; end !COLD-PRINT-INIT
740 ;;; A FSM-like thingie that determines whether a symbol is a potential
741 ;;; number or has evil characters in it.
742 (defun symbol-quotep (name)
743 (declare (simple-string name
))
744 (macrolet ((advance (tag &optional
(at-end t
))
747 ,(if at-end
'(go TEST-SIGN
) '(return nil
)))
748 (setq current
(schar name index
)
749 code
(char-code current
)
751 ((< code
160) (aref attributes code
))
752 ((upper-case-p current
) uppercase-attribute
)
753 ((lower-case-p current
) lowercase-attribute
)
754 (t other-attribute
)))
757 (test (&rest attributes
)
769 `(and (< code
128) ; FIXME
770 (< (the fixnum
(aref bases code
)) base
))))
772 (prog ((len (length name
))
773 (attributes *character-attributes
*)
774 (bases *digit-bases
*)
777 (case (readtable-case *readtable
*)
778 (:upcase uppercase-attribute
)
779 (:downcase lowercase-attribute
)
780 (t (logior lowercase-attribute uppercase-attribute
))))
785 (declare (fixnum len base index bits code
))
788 TEST-SIGN
; At end, see whether it is a sign...
789 (return (not (test sign
)))
791 OTHER
; not potential number, see whether funny chars...
792 (let ((mask (logxor (logior lowercase-attribute uppercase-attribute
795 (do ((i (1- index
) (1+ i
)))
796 ((= i len
) (return-from symbol-quotep nil
))
797 (unless (zerop (logand (let* ((char (schar name i
))
798 (code (char-code char
)))
800 ((< code
160) (aref attributes code
))
801 ((upper-case-p char
) uppercase-attribute
)
802 ((lower-case-p char
) lowercase-attribute
)
803 (t other-attribute
)))
805 (return-from symbol-quotep t
))))
810 (advance LAST-DIGIT-ALPHA
)
812 (when (test letter number other slash
) (advance OTHER nil
))
813 (when (char= current
#\.
) (advance DOT-FOUND
))
814 (when (test sign extension
) (advance START-STUFF nil
))
817 DOT-FOUND
; leading dots...
818 (when (test letter
) (advance START-DOT-MARKER nil
))
819 (when (digitp) (advance DOT-DIGIT
))
820 (when (test number other
) (advance OTHER nil
))
821 (when (test extension slash sign
) (advance START-DOT-STUFF nil
))
822 (when (char= current
#\.
) (advance DOT-FOUND
))
825 START-STUFF
; leading stuff before any dot or digit
828 (advance LAST-DIGIT-ALPHA
)
830 (when (test number other
) (advance OTHER nil
))
831 (when (test letter
) (advance START-MARKER nil
))
832 (when (char= current
#\.
) (advance START-DOT-STUFF nil
))
833 (when (test sign extension slash
) (advance START-STUFF nil
))
836 START-MARKER
; number marker in leading stuff...
837 (when (test letter
) (advance OTHER nil
))
840 START-DOT-STUFF
; leading stuff containing dot without digit...
841 (when (test letter
) (advance START-DOT-STUFF nil
))
842 (when (digitp) (advance DOT-DIGIT
))
843 (when (test sign extension dot slash
) (advance START-DOT-STUFF nil
))
844 (when (test number other
) (advance OTHER nil
))
847 START-DOT-MARKER
; number marker in leading stuff with dot..
848 ;; leading stuff containing dot without digit followed by letter...
849 (when (test letter
) (advance OTHER nil
))
852 DOT-DIGIT
; in a thing with dots...
853 (when (test letter
) (advance DOT-MARKER
))
854 (when (digitp) (advance DOT-DIGIT
))
855 (when (test number other
) (advance OTHER nil
))
856 (when (test sign extension dot slash
) (advance DOT-DIGIT
))
859 DOT-MARKER
; number marker in number with dot...
860 (when (test letter
) (advance OTHER nil
))
863 LAST-DIGIT-ALPHA
; previous char is a letter digit...
864 (when (or (digitp) (test sign slash
))
865 (advance ALPHA-DIGIT
))
866 (when (test letter number other dot
) (advance OTHER nil
))
869 ALPHA-DIGIT
; seen a digit which is a letter...
870 (when (or (digitp) (test sign slash
))
872 (advance LAST-DIGIT-ALPHA
)
873 (advance ALPHA-DIGIT
)))
874 (when (test letter
) (advance ALPHA-MARKER
))
875 (when (test number other dot
) (advance OTHER nil
))
878 ALPHA-MARKER
; number marker in number with alpha digit...
879 (when (test letter
) (advance OTHER nil
))
882 DIGIT
; seen only ordinary (non-alphabetic) numeric digits...
885 (advance ALPHA-DIGIT
)
887 (when (test number other
) (advance OTHER nil
))
888 (when (test letter
) (advance MARKER
))
889 (when (test extension slash sign
) (advance DIGIT
))
890 (when (char= current
#\.
) (advance DOT-DIGIT
))
893 MARKER
; number marker in a numeric number...
894 ;; ("What," you may ask, "is a 'number marker'?" It's something
895 ;; that a conforming implementation might use in number syntax.
896 ;; See ANSI 2.3.1.1 "Potential Numbers as Tokens".)
897 (when (test letter
) (advance OTHER nil
))
900 ;;;; *INTERNAL-SYMBOL-OUTPUT-FUN*
902 ;;;; case hackery: These functions are stored in
903 ;;;; *INTERNAL-SYMBOL-OUTPUT-FUN* according to the values of
904 ;;;; *PRINT-CASE* and READTABLE-CASE.
907 ;;; READTABLE-CASE *PRINT-CASE*
909 ;;; :DOWNCASE :DOWNCASE
911 (defun output-preserve-symbol (pname stream
)
912 (declare (simple-string pname
))
913 (write-string pname stream
))
916 ;;; READTABLE-CASE *PRINT-CASE*
917 ;;; :UPCASE :DOWNCASE
918 (defun output-lowercase-symbol (pname stream
)
919 (declare (simple-string pname
))
920 (dotimes (index (length pname
))
921 (let ((char (schar pname index
)))
922 (write-char (char-downcase char
) stream
))))
925 ;;; READTABLE-CASE *PRINT-CASE*
926 ;;; :DOWNCASE :UPCASE
927 (defun output-uppercase-symbol (pname stream
)
928 (declare (simple-string pname
))
929 (dotimes (index (length pname
))
930 (let ((char (schar pname index
)))
931 (write-char (char-upcase char
) stream
))))
934 ;;; READTABLE-CASE *PRINT-CASE*
935 ;;; :UPCASE :CAPITALIZE
936 ;;; :DOWNCASE :CAPITALIZE
937 (defun output-capitalize-symbol (pname stream
)
938 (declare (simple-string pname
))
939 (let ((prev-not-alphanum t
)
940 (up (eq (readtable-case *readtable
*) :upcase
)))
941 (dotimes (i (length pname
))
942 (let ((char (char pname i
)))
944 (if (or prev-not-alphanum
(lower-case-p char
))
946 (char-downcase char
))
947 (if prev-not-alphanum
951 (setq prev-not-alphanum
(not (alphanumericp char
)))))))
954 ;;; READTABLE-CASE *PRINT-CASE*
956 (defun output-invert-symbol (pname stream
)
957 (declare (simple-string pname
))
960 (dotimes (i (length pname
))
961 (let ((ch (schar pname i
)))
962 (when (both-case-p ch
)
963 (if (upper-case-p ch
)
965 (setq all-upper nil
)))))
966 (cond (all-upper (output-lowercase-symbol pname stream
))
967 (all-lower (output-uppercase-symbol pname stream
))
969 (write-string pname stream
)))))
973 (let ((*readtable
* (copy-readtable nil
)))
974 (format t
"READTABLE-CASE Input Symbol-name~@
975 ----------------------------------~%")
976 (dolist (readtable-case '(:upcase
:downcase
:preserve
:invert
))
977 (setf (readtable-case *readtable
*) readtable-case
)
978 (dolist (input '("ZEBRA" "Zebra" "zebra"))
979 (format t
"~&:~A~16T~A~24T~A"
980 (string-upcase readtable-case
)
982 (symbol-name (read-from-string input
)))))))
985 (let ((*readtable
* (copy-readtable nil
)))
986 (format t
"READTABLE-CASE *PRINT-CASE* Symbol-name Output Princ~@
987 --------------------------------------------------------~%")
988 (dolist (readtable-case '(:upcase
:downcase
:preserve
:invert
))
989 (setf (readtable-case *readtable
*) readtable-case
)
990 (dolist (*print-case
* '(:upcase
:downcase
:capitalize
))
991 (dolist (symbol '(|ZEBRA| |Zebra| |zebra|
))
992 (format t
"~&:~A~15T:~A~29T~A~42T~A~50T~A"
993 (string-upcase readtable-case
)
994 (string-upcase *print-case
*)
996 (prin1-to-string symbol
)
997 (princ-to-string symbol
)))))))
1000 ;;;; recursive objects
1002 (defun output-list (list stream
)
1003 (descend-into (stream)
1004 (write-char #\
( stream
)
1008 (punt-print-if-too-long length stream
)
1009 (output-object (pop list
) stream
)
1012 (when (or (atom list
)
1013 (check-for-circularity list
))
1014 (write-string " . " stream
)
1015 (output-object list stream
)
1017 (write-char #\space stream
)
1019 (write-char #\
) stream
)))
1021 (defun output-unreadable-vector-readably (vector stream
)
1022 (declare (vector vector
))
1023 (write-string "#." stream
)
1024 (write `(coerce ,(coerce vector
'(vector t
))
1025 '(simple-array ,(array-element-type vector
) (*)))
1028 (defun output-vector (vector stream
)
1029 (declare (vector vector
))
1030 (cond ((stringp vector
)
1031 (cond ((and *print-readably
*
1032 (not (eq (array-element-type vector
)
1035 (make-array 0 :element-type
'character
))))))
1036 (print-not-readable-error vector stream
))
1037 ((or *print-escape
* *print-readably
*)
1038 (write-char #\" stream
)
1039 (quote-string vector stream
)
1040 (write-char #\" stream
))
1042 (write-string vector stream
))))
1043 ((not (or *print-array
* *print-readably
*))
1044 (output-terse-array vector stream
))
1045 ((bit-vector-p vector
)
1046 (write-string "#*" stream
)
1047 (dovector (bit vector
)
1048 ;; (Don't use OUTPUT-OBJECT here, since this code
1049 ;; has to work for all possible *PRINT-BASE* values.)
1050 (write-char (if (zerop bit
) #\
0 #\
1) stream
)))
1051 ((or (not *print-readably
*)
1052 (array-readably-printable-p vector
))
1053 (descend-into (stream)
1054 (write-string "#(" stream
)
1055 (dotimes (i (length vector
))
1057 (write-char #\space stream
))
1058 (punt-print-if-too-long i stream
)
1059 (output-object (aref vector i
) stream
))
1060 (write-string ")" stream
)))
1062 (output-unreadable-vector-readably vector stream
))
1064 (print-not-readable-error vector stream
))))
1066 ;;; This function outputs a string quoting characters sufficiently
1067 ;;; so that someone can read it in again. Basically, put a slash in
1068 ;;; front of an character satisfying NEEDS-SLASH-P.
1069 (defun quote-string (string stream
)
1070 (macrolet ((needs-slash-p (char)
1071 ;; KLUDGE: We probably should look at the readtable, but just do
1072 ;; this for now. [noted by anonymous long ago] -- WHN 19991130
1073 `(or (char= ,char
#\\)
1074 (char= ,char
#\"))))
1075 (with-array-data ((data string
) (start) (end)
1076 :check-fill-pointer t
)
1077 (do ((index start
(1+ index
)))
1079 (let ((char (schar data index
)))
1080 (when (needs-slash-p char
) (write-char #\\ stream
))
1081 (write-char char stream
))))))
1083 (defun array-readably-printable-p (array)
1084 (and (eq (array-element-type array
) t
)
1085 (let ((zero (position 0 (array-dimensions array
)))
1086 (number (position 0 (array-dimensions array
)
1087 :test
(complement #'eql
)
1089 (or (null zero
) (null number
) (> zero number
)))))
1091 ;;; Output the printed representation of any array in either the #< or #A
1093 (defun output-array (array stream
)
1094 (if (or *print-array
* *print-readably
*)
1095 (output-array-guts array stream
)
1096 (output-terse-array array stream
)))
1098 ;;; Output the abbreviated #< form of an array.
1099 (defun output-terse-array (array stream
)
1100 (let ((*print-level
* nil
)
1101 (*print-length
* nil
))
1102 (print-unreadable-object (array stream
:type t
:identity t
))))
1104 ;;; Convert an array into a list that can be used with MAKE-ARRAY's
1105 ;;; :INITIAL-CONTENTS keyword argument.
1106 (defun listify-array (array)
1107 (with-array-data ((data array
) (start) (end))
1108 (declare (ignore end
))
1109 (labels ((listify (dimensions index
)
1110 (if (null dimensions
)
1112 (let* ((dimension (car dimensions
))
1113 (dimensions (cdr dimensions
))
1114 (count (reduce #'* dimensions
)))
1115 (loop for i below dimension
1116 collect
(listify dimensions index
)
1117 do
(incf index count
))))))
1118 (listify (array-dimensions array
) start
))))
1120 (defun output-unreadable-array-readably (array stream
)
1121 (write-string "#." stream
)
1122 (write `(make-array ',(array-dimensions array
)
1123 :element-type
',(array-element-type array
)
1124 :initial-contents
',(listify-array array
))
1127 ;;; Output the readable #A form of an array.
1128 (defun output-array-guts (array stream
)
1129 (cond ((or (not *print-readably
*)
1130 (array-readably-printable-p array
))
1131 (write-char #\
# stream
)
1132 (let ((*print-base
* 10)
1133 (*print-radix
* nil
))
1134 (output-integer (array-rank array
) stream
))
1135 (write-char #\A stream
)
1136 (with-array-data ((data array
) (start) (end))
1137 (declare (ignore end
))
1138 (sub-output-array-guts data
(array-dimensions array
) stream start
)))
1140 (output-unreadable-array-readably array stream
))
1142 (print-not-readable-error array stream
))))
1144 (defun sub-output-array-guts (array dimensions stream index
)
1145 (declare (type (simple-array * (*)) array
) (fixnum index
))
1146 (cond ((null dimensions
)
1147 (output-object (aref array index
) stream
))
1149 (descend-into (stream)
1150 (write-char #\
( stream
)
1151 (let* ((dimension (car dimensions
))
1152 (dimensions (cdr dimensions
))
1153 (count (reduce #'* dimensions
)))
1154 (dotimes (i dimension
)
1156 (write-char #\space stream
))
1157 (punt-print-if-too-long i stream
)
1158 (sub-output-array-guts array dimensions stream index
)
1159 (incf index count
)))
1160 (write-char #\
) stream
)))))
1162 ;;; a trivial non-generic-function placeholder for PRINT-OBJECT, for
1163 ;;; use until CLOS is set up (at which time it will be replaced with
1164 ;;; the real generic function implementation)
1165 (defun print-object (instance stream
)
1166 (default-structure-print instance stream
*current-level-in-print
*))
1168 ;;;; integer, ratio, and complex printing (i.e. everything but floats)
1170 (defun %output-radix
(base stream
)
1171 (write-char #\
# stream
)
1172 (write-char (case base
1176 (t (%output-reasonable-integer-in-base base
10 stream
)
1180 (defun %output-reasonable-integer-in-base
(n base stream
)
1181 (multiple-value-bind (q r
)
1183 ;; Recurse until you have all the digits pushed on
1186 (%output-reasonable-integer-in-base q base stream
))
1187 ;; Then as each recursive call unwinds, turn the
1188 ;; digit (in remainder) into a character and output
1191 (schar "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ" r
)
1194 ;;; *POWER-CACHE* is an alist mapping bases to power-vectors. It is
1195 ;;; filled and probed by POWERS-FOR-BASE. SCRUB-POWER-CACHE is called
1196 ;;; always prior a GC to drop overly large bignums from the cache.
1198 ;;; It doesn't need a lock, but if you work on SCRUB-POWER-CACHE or
1199 ;;; POWERS-FOR-BASE, see that you don't break the assumptions!
1200 (defvar *power-cache
* nil
)
1202 (defconstant +power-cache-integer-length-limit
+ 2048)
1204 (defun scrub-power-cache ()
1205 (let ((cache *power-cache
*))
1206 (dolist (cell cache
)
1207 (let ((powers (cdr cell
)))
1208 (declare (simple-vector powers
))
1209 (let ((too-big (position-if
1211 (>= (integer-length x
)
1212 +power-cache-integer-length-limit
+))
1215 (setf (cdr cell
) (subseq powers
0 too-big
))))))
1216 ;; Since base 10 is overwhelmingly common, make sure it's at head.
1217 ;; Try to keep other bases in a hopefully sensible order as well.
1218 (if (eql 10 (caar cache
))
1219 (setf *power-cache
* cache
)
1220 ;; If we modify the list destructively we need to copy it, otherwise
1221 ;; an alist lookup in progress might be screwed.
1222 (setf *power-cache
* (sort (copy-list cache
)
1224 (declare (fixnum a b
))
1234 ;;; Compute (and cache) a power vector for a BASE and LIMIT:
1235 ;;; the vector holds integers for which
1236 ;;; (aref powers k) == (expt base (expt 2 k))
1238 (defun powers-for-base (base limit
)
1239 (flet ((compute-powers (from)
1241 (do ((p from
(* p p
)))
1243 ;; We don't actually need this, but we also
1244 ;; prefer not to cons it up a second time...
1247 (nreverse powers
))))
1248 ;; Grab a local reference so that we won't stuff consed at the
1249 ;; head by other threads -- or sorting by SCRUB-POWER-CACHE.
1250 (let ((cache *power-cache
*))
1251 (let ((cell (assoc base cache
)))
1253 (let* ((powers (cdr cell
))
1254 (len (length powers
))
1255 (max (svref powers
(1- len
))))
1259 (concatenate 'vector powers
1260 (compute-powers (* max max
)))))
1261 (setf (cdr cell
) new
)
1263 (let ((powers (coerce (compute-powers base
) 'vector
)))
1264 ;; Add new base to head: SCRUB-POWER-CACHE will later
1265 ;; put it to a better place.
1266 (setf *power-cache
* (acons base powers cache
))
1269 ;; Algorithm by Harald Hanche-Olsen, sbcl-devel 2005-02-05
1270 (defun %output-huge-integer-in-base
(n base stream
)
1271 (declare (type bignum n
) (type fixnum base
))
1272 ;; POWER is a vector for which the following holds:
1273 ;; (aref power k) == (expt base (expt 2 k))
1274 (let* ((power (powers-for-base base n
))
1275 (k-start (or (position-if (lambda (x) (> x n
)) power
)
1276 (bug "power-vector too short"))))
1277 (labels ((bisect (n k exactp
)
1278 (declare (fixnum k
))
1279 ;; N is the number to bisect
1280 ;; K on initial entry BASE^(2^K) > N
1281 ;; EXACTP is true if 2^K is the exact number of digits
1284 (loop repeat
(ash 1 k
) do
(write-char #\
0 stream
))))
1287 (schar "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ" n
)
1291 (multiple-value-bind (q r
) (truncate n
(aref power k
))
1292 ;; EXACTP is NIL only at the head of the
1293 ;; initial number, as we don't know the number
1294 ;; of digits there, but we do know that it
1295 ;; doesn't get any leading zeros.
1297 (bisect r k
(or exactp
(plusp q
))))))))
1298 (bisect n k-start nil
))))
1300 (defun %output-integer-in-base
(integer base stream
)
1301 (when (minusp integer
)
1302 (write-char #\- stream
)
1303 (setf integer
(- integer
)))
1304 ;; The ideal cutoff point between these two algorithms is almost
1305 ;; certainly quite platform dependent: this gives 87 for 32 bit
1306 ;; SBCL, which is about right at least for x86/Darwin.
1307 (if (or (fixnump integer
)
1308 (< (integer-length integer
) (* 3 sb
!vm
:n-positive-fixnum-bits
)))
1309 (%output-reasonable-integer-in-base integer base stream
)
1310 (%output-huge-integer-in-base integer base stream
)))
1312 (defun output-integer (integer stream
)
1313 (let ((base *print-base
*))
1314 (when (and (/= base
10) *print-radix
*)
1315 (%output-radix base stream
))
1316 (%output-integer-in-base integer base stream
)
1317 (when (and *print-radix
* (= base
10))
1318 (write-char #\. stream
))))
1320 (defun output-ratio (ratio stream
)
1321 (let ((base *print-base
*))
1323 (%output-radix base stream
))
1324 (%output-integer-in-base
(numerator ratio
) base stream
)
1325 (write-char #\
/ stream
)
1326 (%output-integer-in-base
(denominator ratio
) base stream
)))
1328 (defun output-complex (complex stream
)
1329 (write-string "#C(" stream
)
1330 ;; FIXME: Could this just be OUTPUT-NUMBER?
1331 (output-object (realpart complex
) stream
)
1332 (write-char #\space stream
)
1333 (output-object (imagpart complex
) stream
)
1334 (write-char #\
) stream
))
1338 ;;; FLONUM-TO-STRING (and its subsidiary function FLOAT-STRING) does
1339 ;;; most of the work for all printing of floating point numbers in
1340 ;;; FORMAT. It converts a floating point number to a string in a free
1341 ;;; or fixed format with no exponent. The interpretation of the
1342 ;;; arguments is as follows:
1344 ;;; X - The floating point number to convert, which must not be
1346 ;;; WIDTH - The preferred field width, used to determine the number
1347 ;;; of fraction digits to produce if the FDIGITS parameter
1348 ;;; is unspecified or NIL. If the non-fraction digits and the
1349 ;;; decimal point alone exceed this width, no fraction digits
1350 ;;; will be produced unless a non-NIL value of FDIGITS has been
1351 ;;; specified. Field overflow is not considerd an error at this
1353 ;;; FDIGITS - The number of fractional digits to produce. Insignificant
1354 ;;; trailing zeroes may be introduced as needed. May be
1355 ;;; unspecified or NIL, in which case as many digits as possible
1356 ;;; are generated, subject to the constraint that there are no
1357 ;;; trailing zeroes.
1358 ;;; SCALE - If this parameter is specified or non-NIL, then the number
1359 ;;; printed is (* x (expt 10 scale)). This scaling is exact,
1360 ;;; and cannot lose precision.
1361 ;;; FMIN - This parameter, if specified or non-NIL, is the minimum
1362 ;;; number of fraction digits which will be produced, regardless
1363 ;;; of the value of WIDTH or FDIGITS. This feature is used by
1364 ;;; the ~E format directive to prevent complete loss of
1365 ;;; significance in the printed value due to a bogus choice of
1369 ;;; (VALUES DIGIT-STRING DIGIT-LENGTH LEADING-POINT TRAILING-POINT DECPNT)
1370 ;;; where the results have the following interpretation:
1372 ;;; DIGIT-STRING - The decimal representation of X, with decimal point.
1373 ;;; DIGIT-LENGTH - The length of the string DIGIT-STRING.
1374 ;;; LEADING-POINT - True if the first character of DIGIT-STRING is the
1376 ;;; TRAILING-POINT - True if the last character of DIGIT-STRING is the
1378 ;;; POINT-POS - The position of the digit preceding the decimal
1379 ;;; point. Zero indicates point before first digit.
1381 ;;; NOTE: FLONUM-TO-STRING goes to a lot of trouble to guarantee
1382 ;;; accuracy. Specifically, the decimal number printed is the closest
1383 ;;; possible approximation to the true value of the binary number to
1384 ;;; be printed from among all decimal representations with the same
1385 ;;; number of digits. In free-format output, i.e. with the number of
1386 ;;; digits unconstrained, it is guaranteed that all the information is
1387 ;;; preserved, so that a properly- rounding reader can reconstruct the
1388 ;;; original binary number, bit-for-bit, from its printed decimal
1389 ;;; representation. Furthermore, only as many digits as necessary to
1390 ;;; satisfy this condition will be printed.
1392 ;;; FLOAT-DIGITS actually generates the digits for positive numbers;
1393 ;;; see below for comments.
1395 (defun flonum-to-string (x &optional width fdigits scale fmin
)
1396 (declare (type float x
))
1397 ;; FIXME: I think only FORMAT-DOLLARS calls FLONUM-TO-STRING with
1398 ;; possibly-negative X.
1400 (multiple-value-bind (e string
)
1402 (flonum-to-digits x
(min (- (+ fdigits
(or scale
0)))
1404 (if (and width
(> width
1))
1405 (let ((w (multiple-value-list
1409 (if (and scale
(minusp scale
))
1412 (f (multiple-value-list
1413 (flonum-to-digits x
(- (+ (or fmin
0)
1414 (if scale scale
0)))))))
1416 ((>= (length (cadr w
)) (length (cadr f
)))
1418 (t (values-list f
))))
1419 (flonum-to-digits x
)))
1420 (let ((e (if (zerop x
)
1422 (+ e
(or scale
0))))
1423 (stream (make-string-output-stream)))
1426 (write-string string stream
:end
(min (length string
) e
))
1427 (dotimes (i (- e
(length string
)))
1428 (write-char #\
0 stream
))
1429 (write-char #\. stream
)
1430 (write-string string stream
:start
(min (length string
) e
))
1432 (dotimes (i (- fdigits
1434 (min (length string
) e
))))
1435 (write-char #\
0 stream
))))
1437 (write-string "." stream
)
1439 (write-char #\
0 stream
))
1440 (write-string string stream
:end
(when fdigits
1441 (min (length string
)
1445 (dotimes (i (+ fdigits e
(- (length string
))))
1446 (write-char #\
0 stream
)))))
1447 (let ((string (get-output-stream-string stream
)))
1448 (values string
(length string
)
1449 (char= (char string
0) #\.
)
1450 (char= (char string
(1- (length string
))) #\.
)
1451 (position #\. string
))))))
1453 ;;; implementation of figure 1 from Burger and Dybvig, 1996. It is
1454 ;;; extended in order to handle rounding.
1456 ;;; As the implementation of the Dragon from Classic CMUCL (and
1457 ;;; previously in SBCL above FLONUM-TO-STRING) says: "DO NOT EVEN
1458 ;;; THINK OF ATTEMPTING TO UNDERSTAND THIS CODE WITHOUT READING THE
1459 ;;; PAPER!", and in this case we have to add that even reading the
1460 ;;; paper might not bring immediate illumination as CSR has attempted
1461 ;;; to turn idiomatic Scheme into idiomatic Lisp.
1463 ;;; FIXME: figure 1 from Burger and Dybvig is the unoptimized
1464 ;;; algorithm, noticeably slow at finding the exponent. Figure 2 has
1465 ;;; an improved algorithm, but CSR ran out of energy.
1467 ;;; possible extension for the enthusiastic: printing floats in bases
1468 ;;; other than base 10.
1469 (defconstant single-float-min-e
1470 (- 2 sb
!vm
:single-float-bias sb
!vm
:single-float-digits
))
1471 (defconstant double-float-min-e
1472 (- 2 sb
!vm
:double-float-bias sb
!vm
:double-float-digits
))
1474 (defconstant long-float-min-e
1475 (nth-value 1 (decode-float least-positive-long-float
)))
1477 (defun flonum-to-digits (v &optional position relativep
)
1478 (let ((print-base 10) ; B
1480 (float-digits (float-digits v
)) ; p
1481 (digit-characters "0123456789")
1484 (single-float single-float-min-e
)
1485 (double-float double-float-min-e
)
1487 (long-float long-float-min-e
))))
1488 (multiple-value-bind (f e
)
1489 (integer-decode-float v
)
1490 (let (;; FIXME: these even tests assume normal IEEE rounding
1491 ;; mode. I wonder if we should cater for non-normal?
1494 (with-push-char (:element-type base-char
)
1495 (labels ((scale (r s m
+ m-
)
1497 (s s
(* s print-base
)))
1498 ((not (or (> (+ r m
+) s
)
1499 (and high-ok
(= (+ r m
+) s
))))
1501 (r r
(* r print-base
))
1502 (m+ m
+ (* m
+ print-base
))
1503 (m- m-
(* m- print-base
)))
1504 ((not (and (plusp (- r m-
)) ; Extension to handle zero
1505 (or (< (* (+ r m
+) print-base
) s
)
1507 (= (* (+ r m
+) print-base
) s
)))))
1508 (values k
(generate r s m
+ m-
)))))))
1509 (generate (r s m
+ m-
)
1513 (setf (values d r
) (truncate (* r print-base
) s
))
1514 (setf m
+ (* m
+ print-base
))
1515 (setf m-
(* m- print-base
))
1516 (setf tc1
(or (< r m-
) (and low-ok
(= r m-
))))
1517 (setf tc2
(or (> (+ r m
+) s
)
1518 (and high-ok
(= (+ r m
+) s
))))
1521 (push-char (char digit-characters d
))
1525 ((and (not tc1
) tc2
) (1+ d
))
1526 ((and tc1
(not tc2
)) d
)
1528 (if (< (* r
2) s
) d
(1+ d
))))))
1529 (push-char (char digit-characters d
))
1530 (return-from generate
(get-pushed-string))))))
1534 (let* ((be (expt float-radix e
))
1535 (be1 (* be float-radix
)))
1536 (if (/= f
(expt float-radix
(1- float-digits
)))
1546 (/= f
(expt float-radix
(1- float-digits
))))
1548 s
(* (expt float-radix
(- e
)) 2)
1551 (setf r
(* f float-radix
2)
1552 s
(* (expt float-radix
(- 1 e
)) 2)
1557 (aver (> position
0))
1559 ;; running out of letters here
1560 (l 1 (* l print-base
)))
1561 ((>= (* s l
) (+ r m
+))
1563 (if (< (+ r
(* s
(/ (expt print-base
(- k position
)) 2)))
1564 (* s
(expt print-base k
)))
1565 (setf position
(- k position
))
1566 (setf position
(- k position
1))))))
1567 (let ((low (max m-
(/ (* s
(expt print-base position
)) 2)))
1568 (high (max m
+ (/ (* s
(expt print-base position
)) 2))))
1575 (values r s m
+ m-
))))
1576 (multiple-value-bind (r s m
+ m-
) (initialize)
1577 (scale r s m
+ m-
))))))))
1579 ;;; Given a non-negative floating point number, SCALE-EXPONENT returns
1580 ;;; a new floating point number Z in the range (0.1, 1.0] and an
1581 ;;; exponent E such that Z * 10^E is (approximately) equal to the
1582 ;;; original number. There may be some loss of precision due the
1583 ;;; floating point representation. The scaling is always done with
1584 ;;; long float arithmetic, which helps printing of lesser precisions
1585 ;;; as well as avoiding generic arithmetic.
1587 ;;; When computing our initial scale factor using EXPT, we pull out
1588 ;;; part of the computation to avoid over/under flow. When
1589 ;;; denormalized, we must pull out a large factor, since there is more
1590 ;;; negative exponent range than positive range.
1592 (eval-when (:compile-toplevel
:execute
)
1593 (setf *read-default-float-format
*
1594 #!+long-float
'long-float
#!-long-float
'double-float
))
1595 (defun scale-exponent (original-x)
1596 (let* ((x (coerce original-x
'long-float
)))
1597 (multiple-value-bind (sig exponent
) (decode-float x
)
1598 (declare (ignore sig
))
1600 (values (float 0.0e0 original-x
) 1)
1601 (let* ((ex (locally (declare (optimize (safety 0)))
1604 ;; this is the closest double float
1605 ;; to (log 2 10), but expressed so
1606 ;; that we're not vulnerable to the
1607 ;; host lisp's interpretation of
1608 ;; arithmetic. (FIXME: it turns
1609 ;; out that sbcl itself is off by 1
1610 ;; ulp in this value, which is a
1611 ;; little unfortunate.)
1614 (make-double-float 1070810131 1352628735)
1616 (error "(log 2 10) not computed")))))))
1618 (if (float-denormalized-p x
)
1620 (* x
1.0e16
(expt 10.0e0
(- (- ex
) 16)))
1622 (* x
1.0e18
(expt 10.0e0
(- (- ex
) 18)))
1623 (* x
10.0e0
(expt 10.0e0
(- (- ex
) 1))))
1624 (/ x
10.0e0
(expt 10.0e0
(1- ex
))))))
1625 (do ((d 10.0e0
(* d
10.0e0
))
1629 (do ((m 10.0e0
(* m
10.0e0
))
1633 (values (float z original-x
) ex
))
1634 (declare (long-float m
) (integer ex
))))
1635 (declare (long-float d
))))))))
1636 (eval-when (:compile-toplevel
:execute
)
1637 (setf *read-default-float-format
* 'single-float
))
1639 ;;;; entry point for the float printer
1641 ;;; the float printer as called by PRINT, PRIN1, PRINC, etc. The
1642 ;;; argument is printed free-format, in either exponential or
1643 ;;; non-exponential notation, depending on its magnitude.
1645 ;;; NOTE: When a number is to be printed in exponential format, it is
1646 ;;; scaled in floating point. Since precision may be lost in this
1647 ;;; process, the guaranteed accuracy properties of FLONUM-TO-STRING
1648 ;;; are lost. The difficulty is that FLONUM-TO-STRING performs
1649 ;;; extensive computations with integers of similar magnitude to that
1650 ;;; of the number being printed. For large exponents, the bignums
1651 ;;; really get out of hand. If bignum arithmetic becomes reasonably
1652 ;;; fast and the exponent range is not too large, then it might become
1653 ;;; attractive to handle exponential notation with the same accuracy
1654 ;;; as non-exponential notation, using the method described in the
1655 ;;; Steele and White paper.
1657 ;;; NOTE II: this has been bypassed slightly by implementing Burger
1658 ;;; and Dybvig, 1996. When someone has time (KLUDGE) they can
1659 ;;; probably (a) implement the optimizations suggested by Burger and
1660 ;;; Dyvbig, and (b) remove all vestiges of Dragon4, including from
1661 ;;; fixed-format printing.
1663 ;;; Print the appropriate exponent marker for X and the specified exponent.
1664 (defun print-float-exponent (x exp stream
)
1665 (declare (type float x
) (type integer exp
) (type stream stream
))
1666 (let ((*print-radix
* nil
))
1667 (if (typep x
*read-default-float-format
*)
1669 (format stream
"e~D" exp
))
1670 (format stream
"~C~D"
1678 (defun output-float-infinity (x stream
)
1679 (declare (float x
) (stream stream
))
1681 (write-string "#." stream
))
1683 (return-from output-float-infinity
1684 (print-not-readable-error x stream
)))
1686 (write-string "#<" stream
)))
1687 (write-string "SB-EXT:" stream
)
1688 (write-string (symbol-name (float-format-name x
)) stream
)
1689 (write-string (if (plusp x
) "-POSITIVE-" "-NEGATIVE-")
1691 (write-string "INFINITY" stream
)
1693 (write-string ">" stream
)))
1695 (defun output-float-nan (x stream
)
1696 (print-unreadable-object (x stream
)
1697 (princ (float-format-name x
) stream
)
1698 (write-string (if (float-trapping-nan-p x
) " trapping" " quiet") stream
)
1699 (write-string " NaN" stream
)))
1701 ;;; the function called by OUTPUT-OBJECT to handle floats
1702 (defun output-float (x stream
)
1704 ((float-infinity-p x
)
1705 (output-float-infinity x stream
))
1707 (output-float-nan x stream
))
1709 (let ((x (cond ((minusp (float-sign x
))
1710 (write-char #\- stream
)
1716 (write-string "0.0" stream
)
1717 (print-float-exponent x
0 stream
))
1719 (output-float-aux x stream -
3 8)))))))
1721 (defun output-float-aux (x stream e-min e-max
)
1722 (multiple-value-bind (e string
)
1723 (flonum-to-digits x
)
1728 (write-string string stream
:end
(min (length string
) e
))
1729 (dotimes (i (- e
(length string
)))
1730 (write-char #\
0 stream
))
1731 (write-char #\. stream
)
1732 (write-string string stream
:start
(min (length string
) e
))
1733 (when (<= (length string
) e
)
1734 (write-char #\
0 stream
))
1735 (print-float-exponent x
0 stream
))
1737 (write-string "0." stream
)
1739 (write-char #\
0 stream
))
1740 (write-string string stream
)
1741 (print-float-exponent x
0 stream
))))
1742 (t (write-string string stream
:end
1)
1743 (write-char #\. stream
)
1744 (write-string string stream
:start
1)
1745 (print-float-exponent x
(1- e
) stream
)))))
1747 ;;;; other leaf objects
1749 ;;; If *PRINT-ESCAPE* is false, just do a WRITE-CHAR, otherwise output
1750 ;;; the character name or the character in the #\char format.
1751 (defun output-character (char stream
)
1752 (if (or *print-escape
* *print-readably
*)
1753 (let ((graphicp (and (graphic-char-p char
)
1754 (standard-char-p char
)))
1755 (name (char-name char
)))
1756 (write-string "#\\" stream
)
1757 (if (and name
(or (not graphicp
) *print-readably
*))
1758 (quote-string name stream
)
1759 (write-char char stream
)))
1760 (write-char char stream
)))
1762 (defun output-sap (sap stream
)
1763 (declare (type system-area-pointer sap
))
1765 (format stream
"#.(~S #X~8,'0X)" 'int-sap
(sap-int sap
)))
1767 (print-unreadable-object (sap stream
)
1768 (format stream
"system area pointer: #X~8,'0X" (sap-int sap
))))))
1770 (defun output-weak-pointer (weak-pointer stream
)
1771 (declare (type weak-pointer weak-pointer
))
1772 (print-unreadable-object (weak-pointer stream
)
1773 (multiple-value-bind (value validp
) (weak-pointer-value weak-pointer
)
1775 (write-string "weak pointer: " stream
)
1776 (write value
:stream stream
))
1778 (write-string "broken weak pointer" stream
))))))
1780 (defun output-code-component (component stream
)
1781 (print-unreadable-object (component stream
:identity t
)
1782 (let ((dinfo (%code-debug-info component
)))
1783 (cond ((eq dinfo
:bogus-lra
)
1784 (write-string "bogus code object" stream
))
1786 (write-string "code object" stream
)
1788 (write-char #\space stream
)
1789 (output-object (sb!c
::debug-info-name dinfo
) stream
)))))))
1791 (defun output-lra (lra stream
)
1792 (print-unreadable-object (lra stream
:identity t
)
1793 (write-string "return PC object" stream
)))
1795 (defun output-fdefn (fdefn stream
)
1796 (print-unreadable-object (fdefn stream
)
1797 (write-string "FDEFINITION for " stream
)
1798 ;; It's somewhat unhelpful to print as <FDEFINITION for (SETF #)>
1799 ;; Generalized function names are indivisible.
1800 (let ((name (fdefn-name fdefn
)))
1802 (output-object name stream
)
1803 ;; This needn't protect against improper lists.
1804 ;; (You'd get crashes in INTERNAL-NAME-P and other places)
1805 (format stream
"(~{~S~^ ~})" name
)))))
1808 (defun output-simd-pack (pack stream
)
1809 (declare (type simd-pack pack
))
1810 (cond ((and *print-readably
* *read-eval
*)
1812 ((simd-pack double-float
)
1813 (multiple-value-call #'format stream
1815 '%make-simd-pack-double
1816 (%simd-pack-doubles pack
)))
1817 ((simd-pack single-float
)
1818 (multiple-value-call #'format stream
1819 "#.(~S ~S ~S ~S ~S)"
1820 '%make-simd-pack-single
1821 (%simd-pack-singles pack
)))
1823 (multiple-value-call #'format stream
1824 "#.(~S #X~16,'0X #X~16,'0X)"
1825 '%make-simd-pack-ub64
1826 (%simd-pack-ub64s pack
)))))
1828 (print-unreadable-object (pack stream
)
1829 (flet ((all-ones-p (value start end
&aux
(mask (- (ash 1 end
) (ash 1 start
))))
1830 (= (logand value mask
) mask
))
1831 (split-num (value start
)
1834 and v
= (ash value
(- start
)) then
(ash v -
8)
1835 collect
(logand v
#xFF
))))
1836 (multiple-value-bind (low high
)
1837 (%simd-pack-ub64s pack
)
1839 ((simd-pack double-float
)
1840 (multiple-value-bind (v0 v1
) (%simd-pack-doubles pack
)
1841 (format stream
"~S~@{ ~:[~,13E~;~*TRUE~]~}"
1843 (all-ones-p low
0 64) v0
1844 (all-ones-p high
0 64) v1
)))
1845 ((simd-pack single-float
)
1846 (multiple-value-bind (v0 v1 v2 v3
) (%simd-pack-singles pack
)
1847 (format stream
"~S~@{ ~:[~,7E~;~*TRUE~]~}"
1849 (all-ones-p low
0 32) v0
1850 (all-ones-p low
32 64) v1
1851 (all-ones-p high
0 32) v2
1852 (all-ones-p high
32 64) v3
)))
1854 (format stream
"~S~@{ ~{ ~2,'0X~}~}"
1856 (split-num low
0) (split-num low
32)
1857 (split-num high
0) (split-num high
32))))))))))
1861 ;;; Output OBJECT as using PRINT-OBJECT if it's a
1862 ;;; FUNCALLABLE-STANDARD-CLASS, or return NIL otherwise.
1864 ;;; The definition here is a simple temporary placeholder. It will be
1865 ;;; overwritten by a smarter version (capable of calling generic
1866 ;;; PRINT-OBJECT when appropriate) when CLOS is installed.
1867 (defun printed-as-funcallable-standard-class (object stream
)
1868 (declare (ignore object stream
))
1871 (defun output-fun (object stream
)
1872 (let* ((name (%fun-name object
))
1873 (proper-name-p (and (legal-fun-name-p name
) (fboundp name
)
1874 (eq (fdefinition name
) object
))))
1875 (print-unreadable-object (object stream
:identity
(not proper-name-p
))
1876 (format stream
"~:[FUNCTION~;CLOSURE~]~@[ ~S~]"
1880 ;;;; catch-all for unknown things
1882 (defun output-random (object stream
)
1883 (print-unreadable-object (object stream
:identity t
)
1884 (let ((lowtag (lowtag-of object
)))
1886 (#.sb
!vm
:other-pointer-lowtag
1887 (let ((widetag (widetag-of object
)))
1889 (#.sb
!vm
:value-cell-header-widetag
1890 (write-string "value cell " stream
)
1891 (output-object (value-cell-ref object
) stream
))
1893 (write-string "unknown pointer object, widetag=" stream
)
1894 (let ((*print-base
* 16) (*print-radix
* t
))
1895 (output-integer widetag stream
))))))
1896 ((#.sb
!vm
:fun-pointer-lowtag
1897 #.sb
!vm
:instance-pointer-lowtag
1898 #.sb
!vm
:list-pointer-lowtag
)
1899 (write-string "unknown pointer object, lowtag=" stream
)
1900 (let ((*print-base
* 16) (*print-radix
* t
))
1901 (output-integer lowtag stream
)))
1903 (case (widetag-of object
)
1904 (#.sb
!vm
:unbound-marker-widetag
1905 (write-string "unbound marker" stream
))
1907 (write-string "unknown immediate object, lowtag=" stream
)
1908 (let ((*print-base
* 2) (*print-radix
* t
))
1909 (output-integer lowtag stream
))
1910 (write-string ", widetag=" stream
)
1911 (let ((*print-base
* 16) (*print-radix
* t
))
1912 (output-integer (widetag-of object
) stream
)))))))))