;;;; the printer ;;;; This software is part of the SBCL system. See the README file for ;;;; more information. ;;;; ;;;; This software is derived from the CMU CL system, which was ;;;; written at Carnegie Mellon University and released into the ;;;; public domain. The software is in the public domain and is ;;;; provided with absolutely no warranty. See the COPYING and CREDITS ;;;; files for more information. (in-package "SB!IMPL") ;;;; exported printer control variables ;;; FIXME: Many of these have nontrivial types, e.g. *PRINT-LEVEL*, ;;; *PRINT-LENGTH*, and *PRINT-LINES* are (OR NULL UNSIGNED-BYTE). (defvar *print-readably* nil #!+sb-doc "If true, all objects will printed readably. If readable printing is impossible, an error will be signalled. This overrides the value of *PRINT-ESCAPE*.") (defvar *print-escape* T #!+sb-doc "Flag which indicates that slashification is on. See the manual") (defvar *print-pretty* nil ; (set later when pretty-printer is initialized) #!+sb-doc "Flag which indicates that pretty printing is to be used") (defvar *print-base* 10. #!+sb-doc "The output base for integers and rationals.") (defvar *print-radix* nil #!+sb-doc "This flag requests to verify base when printing rationals.") (defvar *print-level* nil #!+sb-doc "How many levels deep to print. Unlimited if null.") (defvar *print-length* nil #!+sb-doc "How many elements to print on each level. Unlimited if null.") (defvar *print-circle* nil #!+sb-doc "Whether to worry about circular list structures. See the manual.") (defvar *print-case* :upcase #!+sb-doc "What kind of case the printer should use by default") (defvar *print-array* t #!+sb-doc "Whether the array should print its guts out") (defvar *print-gensym* t #!+sb-doc "If true, symbols with no home package are printed with a #: prefix. If false, no prefix is printed.") (defvar *print-lines* nil #!+sb-doc "The maximum number of lines to print. If NIL, unlimited.") (defvar *print-right-margin* nil #!+sb-doc "The position of the right margin in ems. If NIL, try to determine this from the stream in use.") (defvar *print-miser-width* nil #!+sb-doc "If the remaining space between the current column and the right margin is less than this, then print using ``miser-style'' output. Miser style conditional newlines are turned on, and all indentations are turned off. If NIL, never use miser mode.") (defvar *print-pprint-dispatch* nil #!+sb-doc "The pprint-dispatch-table that controls how to pretty print objects. See COPY-PPRINT-DISPATH, PPRINT-DISPATCH, and SET-PPRINT-DISPATCH.") (defmacro with-standard-io-syntax (&body body) #!+sb-doc "Bind the reader and printer control variables to values that enable READ to reliably read the results of PRINT. These values are: *PACKAGE* the COMMON-LISP-USER package *PRINT-ARRAY* T *PRINT-BASE* 10 *PRINT-CASE* :UPCASE *PRINT-CIRCLE* NIL *PRINT-ESCAPE* T *PRINT-GENSYM* T *PRINT-LENGTH* NIL *PRINT-LEVEL* NIL *PRINT-LINES* NIL *PRINT-MISER-WIDTH* NIL *PRINT-PRETTY* NIL *PRINT-RADIX* NIL *PRINT-READABLY* T *PRINT-RIGHT-MARGIN* NIL *READ-BASE* 10 *READ-DEFAULT-FLOAT-FORMAT* SINGLE-FLOAT *READ-EVAL* T *READ-SUPPRESS* NIL *READTABLE* the standard readtable." `(%with-standard-io-syntax #'(lambda () ,@body))) (defun %with-standard-io-syntax (function) (let ((*package* (find-package "COMMON-LISP-USER")) (*print-array* t) (*print-base* 10) (*print-case* :upcase) (*print-circle* nil) (*print-escape* t) (*print-gensym* t) (*print-length* nil) (*print-level* nil) (*print-lines* nil) (*print-miser-width* nil) (*print-pretty* nil) (*print-radix* nil) (*print-readably* t) (*print-right-margin* nil) (*read-base* 10) (*read-default-float-format* 'single-float) (*read-eval* t) (*read-suppress* nil) ;; FIXME: It doesn't seem like a good idea to expose our ;; disaster-recovery *STANDARD-READTABLE* here. Perhaps we ;; should do a COPY-READTABLE? The consing would be unfortunate, ;; though. (*readtable* *standard-readtable*)) (funcall function))) ;;;; routines to print objects (defun write (object &key ((:stream stream) *standard-output*) ((:escape *print-escape*) *print-escape*) ((:radix *print-radix*) *print-radix*) ((:base *print-base*) *print-base*) ((:circle *print-circle*) *print-circle*) ((:pretty *print-pretty*) *print-pretty*) ((:level *print-level*) *print-level*) ((:length *print-length*) *print-length*) ((:case *print-case*) *print-case*) ((:array *print-array*) *print-array*) ((:gensym *print-gensym*) *print-gensym*) ((:readably *print-readably*) *print-readably*) ((:right-margin *print-right-margin*) *print-right-margin*) ((:miser-width *print-miser-width*) *print-miser-width*) ((:lines *print-lines*) *print-lines*) ((:pprint-dispatch *print-pprint-dispatch*) *print-pprint-dispatch*)) #!+sb-doc "Outputs OBJECT to the specified stream, defaulting to *STANDARD-OUTPUT*" (output-object object (out-synonym-of stream)) object) (defun prin1 (object &optional stream) #!+sb-doc "Outputs a mostly READable printed representation of OBJECT on the specified STREAM." (let ((*print-escape* T)) (output-object object (out-synonym-of stream))) object) (defun princ (object &optional stream) #!+sb-doc "Outputs an aesthetic but not necessarily READable printed representation of OBJECT on the specified STREAM." (let ((*print-escape* NIL) (*print-readably* NIL)) (output-object object (out-synonym-of stream))) object) (defun print (object &optional stream) #!+sb-doc "Outputs a terpri, the mostly READable printed represenation of OBJECT, and space to the specified STREAM." (let ((stream (out-synonym-of stream))) (terpri stream) (prin1 object stream) (write-char #\space stream) object)) (defun pprint (object &optional stream) #!+sb-doc "Prettily outputs OBJECT preceded by a newline." (let ((*print-pretty* t) (*print-escape* t) (stream (out-synonym-of stream))) (terpri stream) (output-object object stream)) (values)) (defun write-to-string (object &key ((:escape *print-escape*) *print-escape*) ((:radix *print-radix*) *print-radix*) ((:base *print-base*) *print-base*) ((:circle *print-circle*) *print-circle*) ((:pretty *print-pretty*) *print-pretty*) ((:level *print-level*) *print-level*) ((:length *print-length*) *print-length*) ((:case *print-case*) *print-case*) ((:array *print-array*) *print-array*) ((:gensym *print-gensym*) *print-gensym*) ((:readably *print-readably*) *print-readably*) ((:right-margin *print-right-margin*) *print-right-margin*) ((:miser-width *print-miser-width*) *print-miser-width*) ((:lines *print-lines*) *print-lines*) ((:pprint-dispatch *print-pprint-dispatch*) *print-pprint-dispatch*)) #!+sb-doc "Returns the printed representation of OBJECT as a string." (stringify-object object)) (defun prin1-to-string (object) #!+sb-doc "Returns the printed representation of OBJECT as a string with slashification on." (stringify-object object t)) (defun princ-to-string (object) #!+sb-doc "Returns the printed representation of OBJECT as a string with slashification off." (stringify-object object nil)) ;;; This produces the printed representation of an object as a string. The ;;; few ...-TO-STRING functions above call this. (defvar *string-output-streams* ()) (defun stringify-object (object &optional (*print-escape* *print-escape*)) (let ((stream (if *string-output-streams* (pop *string-output-streams*) (make-string-output-stream)))) (setup-printer-state) (output-object object stream) (prog1 (get-output-stream-string stream) (push stream *string-output-streams*)))) ;;;; support for the PRINT-UNREADABLE-OBJECT macro (defun %print-unreadable-object (object stream type identity body) (when *print-readably* (error 'print-not-readable :object object)) (write-string "#<" stream) (when type (write (type-of object) :stream stream :circle nil :level nil :length nil) (write-char #\space stream)) (when body (funcall body)) (when identity (unless (and type (null body)) (write-char #\space stream)) (write-char #\{ stream) (write (get-lisp-obj-address object) :stream stream :radix nil :base 16) (write-char #\} stream)) (write-char #\> stream) nil) ;;;; WHITESPACE-CHAR-P ;;; This is used in other files, but is defined in this one for some reason. (defun whitespace-char-p (char) #!+sb-doc "Determines whether or not the character is considered whitespace." (or (char= char #\space) (char= char (code-char tab-char-code)) (char= char (code-char return-char-code)) (char= char #\linefeed))) ;;;; circularity detection stuff ;;; When *PRINT-CIRCLE* is T, this gets bound to a hash table that (eventually) ;;; ends up with entries for every object printed. When we are initially ;;; looking for circularities, we enter a T when we find an object for the ;;; first time, and a 0 when we encounter an object a second time around. ;;; When we are actually printing, the 0 entries get changed to the actual ;;; marker value when they are first printed. (defvar *circularity-hash-table* nil) ;;; When NIL, we are just looking for circularities. After we have found them ;;; all, this gets bound to 0. Then whenever we need a new marker, it is ;;; incremented. (defvar *circularity-counter* nil) (defun check-for-circularity (object &optional assign) #!+sb-doc "Check to see whether OBJECT is a circular reference, and return something non-NIL if it is. If ASSIGN is T, then the number to use in the #n= and #n# noise is assigned at this time. Note: CHECK-FOR-CIRCULARITY must be called *EXACTLY* once with ASSIGN T, or the circularity detection noise will get confused about when to use #n= and when to use #n#. If this returns non-NIL when ASSIGN is T, then you must call HANDLE-CIRCULARITY on it. If you are not using this inside a WITH-CIRCULARITY-DETECTION, then you have to be prepared to handle a return value of :INITIATE which means it needs to initiate the circularity detection noise. See the source for info on how to do that." (cond ((null *print-circle*) ;; Don't bother, nobody cares. nil) ((null *circularity-hash-table*) :initiate) ((null *circularity-counter*) (ecase (gethash object *circularity-hash-table*) ((nil) ;; First encounter. (setf (gethash object *circularity-hash-table*) t) ;; We need to keep looking. nil) ((t) ;; Second encounter. (setf (gethash object *circularity-hash-table*) 0) ;; It's a circular reference. t) (0 ;; It's a circular reference. t))) (t (let ((value (gethash object *circularity-hash-table*))) (case value ((nil t) ;; If NIL, we found an object that wasn't there the first time ;; around. If T, exactly one occurance of this object appears. ;; Either way, just print the thing without any special ;; processing. Note: you might argue that finding a new object ;; means that something is broken, but this can happen. If ;; someone uses the ~@<...~:> format directive, it conses a ;; new list each time though format (i.e. the &REST list), so ;; we will have different cdrs. nil) (0 (if assign (let ((value (incf *circularity-counter*))) ;; First occurance of this object. Set the counter. (setf (gethash object *circularity-hash-table*) value) value) t)) (t ;; Second or later occurance. (- value))))))) (defun handle-circularity (marker stream) #!+sb-doc "Handle the results of CHECK-FOR-CIRCULARITY. If this returns T then you should go ahead and print the object. If it returns NIL, then you should blow it off." (case marker (:initiate ;; Someone forgot to initiate circularity detection. (let ((*print-circle* nil)) (error "trying to use CHECK-FOR-CIRCULARITY when ~ circularity checking isn't initiated"))) ((t) ;; It's a second (or later) reference to the object while we are ;; just looking. So don't bother groveling it again. nil) (t (write-char #\# stream) (let ((*print-base* 10) (*print-radix* nil)) (cond ((minusp marker) (output-integer (- marker) stream) (write-char #\# stream) nil) (t (output-integer marker stream) (write-char #\= stream) t)))))) ;;;; OUTPUT-OBJECT -- the main entry point (defvar *pretty-printer* nil #!+sb-doc "The current pretty printer. Should be either a function that takes two arguments (the object and the stream) or NIL to indicate that there is no pretty printer installed.") (defun output-object (object stream) #!+sb-doc "Output OBJECT to STREAM observing all printer control variables." (labels ((print-it (stream) (if *print-pretty* (if *pretty-printer* (funcall *pretty-printer* object stream) (let ((*print-pretty* nil)) (output-ugly-object object stream))) (output-ugly-object object stream))) (check-it (stream) (let ((marker (check-for-circularity object t))) (case marker (:initiate (let ((*circularity-hash-table* (make-hash-table :test 'eq))) (check-it (make-broadcast-stream)) (let ((*circularity-counter* 0)) (check-it stream)))) ((nil) (print-it stream)) (t (when (handle-circularity marker stream) (print-it stream))))))) (cond ((or (not *print-circle*) (numberp object) (characterp object) (and (symbolp object) (symbol-package object) t)) ;; If it a number, character, or interned symbol, we do not want ;; to check for circularity/sharing. (print-it stream)) ((or *circularity-hash-table* (consp object) (typep object 'instance) (typep object '(array t *))) ;; If we have already started circularity detection, this object ;; might be a sharded reference. If we have not, then if it is ;; a cons, a instance, or an array of element type t it might ;; contain a circular reference to itself or multiple shared ;; references. (check-it stream)) (t (print-it stream))))) (defun output-ugly-object (object stream) #!+sb-doc "Output OBJECT to STREAM observing all printer control variables except for *PRINT-PRETTY*. Note: if *PRINT-PRETTY* is non-NIL, then the pretty printer will be used for any components of OBJECT, just not for OBJECT itself." (typecase object ;; KLUDGE: The TYPECASE approach here is non-ANSI; the ANSI definition of ;; PRINT-OBJECT says it provides printing and we're supposed to provide ;; PRINT-OBJECT methods covering all classes. We deviate from this ;; by using PRINT-OBJECT only when we print instance values. However, ;; ANSI makes it hard to tell that we're deviating from this: ;; (1) ANSI specifies that the user isn't supposed to call PRINT-OBJECT ;; directly. ;; (2) ANSI (section 11.1.2.1.2) says it's undefined to define ;; a method on an external symbol in the CL package which is ;; applicable to arg lists containing only direct instances of ;; standardized classes. ;; Thus, in order for the user to detect our sleaziness, he has to do ;; something relatively obscure like ;; (1) actually use tools like FIND-METHOD to look for PRINT-OBJECT ;; methods, or ;; (2) define a PRINT-OBJECT method which is specialized on the stream ;; value (e.g. a Gray stream object). ;; As long as no one comes up with a non-obscure way of detecting this ;; sleaziness, fixing this nonconformity will probably have a low ;; priority. -- WHN 20000121 (fixnum (output-integer object stream)) (list (if (null object) (output-symbol object stream) (output-list object stream))) (instance (print-object object stream)) (function (unless (and (funcallable-instance-p object) (printed-as-funcallable-standard-class object stream)) (output-function object stream))) (symbol (output-symbol object stream)) (number (etypecase object (integer (output-integer object stream)) (float (output-float object stream)) (ratio (output-ratio object stream)) (ratio (output-ratio object stream)) (complex (output-complex object stream)))) (character (output-character object stream)) (vector (output-vector object stream)) (array (output-array object stream)) (system-area-pointer (output-sap object stream)) (weak-pointer (output-weak-pointer object stream)) (lra (output-lra object stream)) (code-component (output-code-component object stream)) (fdefn (output-fdefn object stream)) (t (output-random object stream)))) ;;;; symbols ;;; Values of *PRINT-CASE* and (READTABLE-CASE *READTABLE*) the last time the ;;; printer was called. (defvar *previous-case* nil) (defvar *previous-readtable-case* nil) ;;; This variable contains the current definition of one of three symbol ;;; printers. SETUP-PRINTER-STATE sets this variable. (defvar *internal-symbol-output-function* nil) ;;; This function sets the internal global symbol ;;; *INTERNAL-SYMBOL-OUTPUT-FUNCTION* to the right function depending ;;; on the value of *PRINT-CASE*. See the manual for details. The ;;; print buffer stream is also reset. (defun setup-printer-state () (unless (and (eq *print-case* *previous-case*) (eq (readtable-case *readtable*) *previous-readtable-case*)) (setq *previous-case* *print-case*) (setq *previous-readtable-case* (readtable-case *readtable*)) (unless (member *print-case* '(:upcase :downcase :capitalize)) (setq *print-case* :upcase) (error "invalid *PRINT-CASE* value: ~S" *previous-case*)) (unless (member *previous-readtable-case* '(:upcase :downcase :invert :preserve)) (setf (readtable-case *readtable*) :upcase) (error "invalid READTABLE-CASE value: ~S" *previous-readtable-case*)) (setq *internal-symbol-output-function* (case *previous-readtable-case* (:upcase (case *print-case* (:upcase #'output-preserve-symbol) (:downcase #'output-lowercase-symbol) (:capitalize #'output-capitalize-symbol))) (:downcase (case *print-case* (:upcase #'output-uppercase-symbol) (:downcase #'output-preserve-symbol) (:capitalize #'output-capitalize-symbol))) (:preserve #'output-preserve-symbol) (:invert #'output-invert-symbol))))) ;;; Output PNAME (a symbol-name or package-name) surrounded with |'s, ;;; and with any embedded |'s or \'s escaped. (defun output-quoted-symbol-name (pname stream) (write-char #\| stream) (dotimes (index (length pname)) (let ((char (schar pname index))) (when (or (char= char #\\) (char= char #\|)) (write-char #\\ stream)) (write-char char stream))) (write-char #\| stream)) (defun output-symbol (object stream) (if (or *print-escape* *print-readably*) (let ((package (symbol-package object)) (name (symbol-name object))) (cond ;; The ANSI spec "22.1.3.3.1 Package Prefixes for Symbols" ;; requires that keywords be printed with preceding colons ;; always, regardless of the value of *PACKAGE*. ((eq package *keyword-package*) (write-char #\: stream)) ;; Otherwise, if the symbol's home package is the current ;; one, then a prefix is never necessary. ((eq package (sane-package))) ;; Uninterned symbols print with a leading #:. ((null package) (when (or *print-gensym* *print-readably*) (write-string "#:" stream))) (t (multiple-value-bind (symbol accessible) (find-symbol name (sane-package)) ;; If we can find the symbol by looking it up, it need not ;; be qualified. This can happen if the symbol has been ;; inherited from a package other than its home package. (unless (and accessible (eq symbol object)) (output-symbol-name (package-name package) stream) (multiple-value-bind (symbol externalp) (find-external-symbol name package) (declare (ignore symbol)) (if externalp (write-char #\: stream) (write-string "::" stream))))))) (output-symbol-name name stream)) (output-symbol-name (symbol-name object) stream nil))) ;;; Output the string NAME as if it were a symbol name. In other words, ;;; diddle its case according to *PRINT-CASE* and READTABLE-CASE. (defun output-symbol-name (name stream &optional (maybe-quote t)) (declare (type simple-base-string name)) (setup-printer-state) (if (and maybe-quote (symbol-quotep name)) (output-quoted-symbol-name name stream) (funcall *internal-symbol-output-function* name stream))) ;;;; escaping symbols ;;; When we print symbols we have to figure out if they need to be ;;; printed with escape characters. This isn't a whole lot easier than ;;; reading symbols in the first place. ;;; ;;; For each character, the value of the corresponding element is a ;;; fixnum with bits set corresponding to attributes that the ;;; character has. At characters have at least one bit set, so we can ;;; search for any character with a positive test. (defvar *character-attributes* (make-array char-code-limit :element-type '(unsigned-byte 16) :initial-element 0)) (declaim (type (simple-array (unsigned-byte 16) (#.char-code-limit)) *character-attributes*)) ;;; Constants which are a bit-mask for each interesting character attribute. (defconstant other-attribute (ash 1 0)) ; Anything else legal. (defconstant number-attribute (ash 1 1)) ; A numeric digit. (defconstant uppercase-attribute (ash 1 2)) ; An uppercase letter. (defconstant lowercase-attribute (ash 1 3)) ; A lowercase letter. (defconstant sign-attribute (ash 1 4)) ; +- (defconstant extension-attribute (ash 1 5)) ; ^_ (defconstant dot-attribute (ash 1 6)) ; . (defconstant slash-attribute (ash 1 7)) ; / (defconstant funny-attribute (ash 1 8)) ; Anything illegal. (eval-when (:compile-toplevel :load-toplevel :execute) ;;; LETTER-ATTRIBUTE is a local of SYMBOL-QUOTEP. It matches letters ;;; that don't need to be escaped (according to READTABLE-CASE.) (defparameter *attribute-names* `((number . number-attribute) (lowercase . lowercase-attribute) (uppercase . uppercase-attribute) (letter . letter-attribute) (sign . sign-attribute) (extension . extension-attribute) (dot . dot-attribute) (slash . slash-attribute) (other . other-attribute) (funny . funny-attribute))) ) ; EVAL-WHEN (flet ((set-bit (char bit) (let ((code (char-code char))) (setf (aref *character-attributes* code) (logior bit (aref *character-attributes* code)))))) (dolist (char '(#\! #\@ #\$ #\% #\& #\* #\= #\~ #\[ #\] #\{ #\} #\? #\< #\>)) (set-bit char other-attribute)) (dotimes (i 10) (set-bit (digit-char i) number-attribute)) (do ((code (char-code #\A) (1+ code)) (end (char-code #\Z))) ((> code end)) (declare (fixnum code end)) (set-bit (code-char code) uppercase-attribute) (set-bit (char-downcase (code-char code)) lowercase-attribute)) (set-bit #\- sign-attribute) (set-bit #\+ sign-attribute) (set-bit #\^ extension-attribute) (set-bit #\_ extension-attribute) (set-bit #\. dot-attribute) (set-bit #\/ slash-attribute) ;; Mark anything not explicitly allowed as funny. (dotimes (i char-code-limit) (when (zerop (aref *character-attributes* i)) (setf (aref *character-attributes* i) funny-attribute)))) ;;; For each character, the value of the corresponding element is the lowest ;;; base in which that character is a digit. (defvar *digit-bases* (make-array char-code-limit :element-type '(unsigned-byte 8) :initial-element 36)) (declaim (type (simple-array (unsigned-byte 8) (#.char-code-limit)) *digit-bases*)) (dotimes (i 36) (let ((char (digit-char i 36))) (setf (aref *digit-bases* (char-code char)) i))) ;;; A FSM-like thingie that determines whether a symbol is a potential ;;; number or has evil characters in it. (defun symbol-quotep (name) (declare (simple-string name)) (macrolet ((advance (tag &optional (at-end t)) `(progn (when (= index len) ,(if at-end '(go TEST-SIGN) '(return nil))) (setq current (schar name index) code (char-code current) bits (aref attributes code)) (incf index) (go ,tag))) (test (&rest attributes) `(not (zerop (the fixnum (logand (logior ,@(mapcar (lambda (x) (or (cdr (assoc x *attribute-names*)) (error "Blast!"))) attributes)) bits))))) (digitp () `(< (the fixnum (aref bases code)) base))) (prog ((len (length name)) (attributes *character-attributes*) (bases *digit-bases*) (base *print-base*) (letter-attribute (case (readtable-case *readtable*) (:upcase uppercase-attribute) (:downcase lowercase-attribute) (t (logior lowercase-attribute uppercase-attribute)))) (index 0) (bits 0) (code 0) current) (declare (fixnum len base index bits code)) (advance START t) TEST-SIGN ; At end, see whether it is a sign... (return (not (test sign))) OTHER ; Not potential number, see whether funny chars... (let ((mask (logxor (logior lowercase-attribute uppercase-attribute funny-attribute) letter-attribute))) (do ((i (1- index) (1+ i))) ((= i len) (return-from symbol-quotep nil)) (unless (zerop (logand (aref attributes (char-code (schar name i))) mask)) (return-from symbol-quotep t)))) START (when (digitp) (if (test letter) (advance LAST-DIGIT-ALPHA) (advance DIGIT))) (when (test letter number other slash) (advance OTHER nil)) (when (char= current #\.) (advance DOT-FOUND)) (when (test sign extension) (advance START-STUFF nil)) (return t) DOT-FOUND ; Leading dots... (when (test letter) (advance START-DOT-MARKER nil)) (when (digitp) (advance DOT-DIGIT)) (when (test number other) (advance OTHER nil)) (when (test extension slash sign) (advance START-DOT-STUFF nil)) (when (char= current #\.) (advance DOT-FOUND)) (return t) START-STUFF ; Leading stuff before any dot or digit. (when (digitp) (if (test letter) (advance LAST-DIGIT-ALPHA) (advance DIGIT))) (when (test number other) (advance OTHER nil)) (when (test letter) (advance START-MARKER nil)) (when (char= current #\.) (advance START-DOT-STUFF nil)) (when (test sign extension slash) (advance START-STUFF nil)) (return t) START-MARKER ; Number marker in leading stuff... (when (test letter) (advance OTHER nil)) (go START-STUFF) START-DOT-STUFF ; Leading stuff containing dot w/o digit... (when (test letter) (advance START-DOT-STUFF nil)) (when (digitp) (advance DOT-DIGIT)) (when (test sign extension dot slash) (advance START-DOT-STUFF nil)) (when (test number other) (advance OTHER nil)) (return t) START-DOT-MARKER ; Number marker in leading stuff w/ dot.. ;; Leading stuff containing dot w/o digit followed by letter... (when (test letter) (advance OTHER nil)) (go START-DOT-STUFF) DOT-DIGIT ; In a thing with dots... (when (test letter) (advance DOT-MARKER)) (when (digitp) (advance DOT-DIGIT)) (when (test number other) (advance OTHER nil)) (when (test sign extension dot slash) (advance DOT-DIGIT)) (return t) DOT-MARKER ; Number maker in number with dot... (when (test letter) (advance OTHER nil)) (go DOT-DIGIT) LAST-DIGIT-ALPHA ; Previous char is a letter digit... (when (or (digitp) (test sign slash)) (advance ALPHA-DIGIT)) (when (test letter number other dot) (advance OTHER nil)) (return t) ALPHA-DIGIT ; Seen a digit which is a letter... (when (or (digitp) (test sign slash)) (if (test letter) (advance LAST-DIGIT-ALPHA) (advance ALPHA-DIGIT))) (when (test letter) (advance ALPHA-MARKER)) (when (test number other dot) (advance OTHER nil)) (return t) ALPHA-MARKER ; Number marker in number with alpha digit... (when (test letter) (advance OTHER nil)) (go ALPHA-DIGIT) DIGIT ; Seen only real numeric digits... (when (digitp) (if (test letter) (advance ALPHA-DIGIT) (advance DIGIT))) (when (test number other) (advance OTHER nil)) (when (test letter) (advance MARKER)) (when (test extension slash sign) (advance DIGIT)) (when (char= current #\.) (advance DOT-DIGIT)) (return t) MARKER ; Number marker in a numeric number... (when (test letter) (advance OTHER nil)) (go DIGIT)))) ;;;; *INTERNAL-SYMBOL-OUTPUT-FUNCTION* ;;;; ;;;; Case hackery. These functions are stored in ;;;; *INTERNAL-SYMBOL-OUTPUT-FUNCTION* according to the values of *PRINT-CASE* ;;;; and READTABLE-CASE. ;; Called when: ;; READTABLE-CASE *PRINT-CASE* ;; :UPCASE :UPCASE ;; :DOWNCASE :DOWNCASE ;; :PRESERVE any (defun output-preserve-symbol (pname stream) (declare (simple-string pname)) (write-string pname stream)) ;; Called when: ;; READTABLE-CASE *PRINT-CASE* ;; :UPCASE :DOWNCASE (defun output-lowercase-symbol (pname stream) (declare (simple-string pname)) (dotimes (index (length pname)) (let ((char (schar pname index))) (write-char (char-downcase char) stream)))) ;; Called when: ;; READTABLE-CASE *PRINT-CASE* ;; :DOWNCASE :UPCASE (defun output-uppercase-symbol (pname stream) (declare (simple-string pname)) (dotimes (index (length pname)) (let ((char (schar pname index))) (write-char (char-upcase char) stream)))) ;; Called when: ;; READTABLE-CASE *PRINT-CASE* ;; :UPCASE :CAPITALIZE ;; :DOWNCASE :CAPITALIZE (defun output-capitalize-symbol (pname stream) (declare (simple-string pname)) (let ((prev-not-alpha t) (up (eq (readtable-case *readtable*) :upcase))) (dotimes (i (length pname)) (let ((char (char pname i))) (write-char (if up (if (or prev-not-alpha (lower-case-p char)) char (char-downcase char)) (if prev-not-alpha (char-upcase char) char)) stream) (setq prev-not-alpha (not (alpha-char-p char))))))) ;; Called when: ;; READTABLE-CASE *PRINT-CASE* ;; :INVERT any (defun output-invert-symbol (pname stream) (declare (simple-string pname)) (let ((all-upper t) (all-lower t)) (dotimes (i (length pname)) (let ((ch (schar pname i))) (when (both-case-p ch) (if (upper-case-p ch) (setq all-lower nil) (setq all-upper nil))))) (cond (all-upper (output-lowercase-symbol pname stream)) (all-lower (output-uppercase-symbol pname stream)) (t (write-string pname stream))))) #| (defun test1 () (let ((*readtable* (copy-readtable nil))) (format t "READTABLE-CASE Input Symbol-name~@ ----------------------------------~%") (dolist (readtable-case '(:upcase :downcase :preserve :invert)) (setf (readtable-case *readtable*) readtable-case) (dolist (input '("ZEBRA" "Zebra" "zebra")) (format t "~&:~A~16T~A~24T~A" (string-upcase readtable-case) input (symbol-name (read-from-string input))))))) (defun test2 () (let ((*readtable* (copy-readtable nil))) (format t "READTABLE-CASE *PRINT-CASE* Symbol-name Output Princ~@ --------------------------------------------------------~%") (dolist (readtable-case '(:upcase :downcase :preserve :invert)) (setf (readtable-case *readtable*) readtable-case) (dolist (*print-case* '(:upcase :downcase :capitalize)) (dolist (symbol '(|ZEBRA| |Zebra| |zebra|)) (format t "~&:~A~15T:~A~29T~A~42T~A~50T~A" (string-upcase readtable-case) (string-upcase *print-case*) (symbol-name symbol) (prin1-to-string symbol) (princ-to-string symbol))))))) |# ;;;; recursive objects (defun output-list (list stream) (descend-into (stream) (write-char #\( stream) (let ((length 0) (list list)) (loop (punt-print-if-too-long length stream) (output-object (pop list) stream) (unless list (return)) (when (or (atom list) (check-for-circularity list)) (write-string " . " stream) (output-object list stream) (return)) (write-char #\space stream) (incf length))) (write-char #\) stream))) (defun output-vector (vector stream) (declare (vector vector)) (cond ((stringp vector) (if (or *print-escape* *print-readably*) (quote-string vector stream) (write-string vector stream))) ((not (or *print-array* *print-readably*)) (output-terse-array vector stream)) ((bit-vector-p vector) (write-string "#*" stream) (dotimes (i (length vector)) (output-object (aref vector i) stream))) (t (when (and *print-readably* (not (eq (array-element-type vector) 't))) (error 'print-not-readable :object vector)) (descend-into (stream) (write-string "#(" stream) (dotimes (i (length vector)) (unless (zerop i) (write-char #\space stream)) (punt-print-if-too-long i stream) (output-object (aref vector i) stream)) (write-string ")" stream))))) ;;; This function outputs a string quoting characters sufficiently that so ;;; someone can read it in again. Basically, put a slash in front of an ;;; character satisfying NEEDS-SLASH-P (defun quote-string (string stream) (macrolet ((needs-slash-p (char) ;; KLUDGE: We probably should look at the readtable, but just do ;; this for now. [noted by anonymous long ago] -- WHN 19991130 `(or (char= ,char #\\) (char= ,char #\")))) (write-char #\" stream) (with-array-data ((data string) (start) (end (length string))) (do ((index start (1+ index))) ((>= index end)) (let ((char (schar data index))) (when (needs-slash-p char) (write-char #\\ stream)) (write-char char stream)))) (write-char #\" stream))) (defun output-array (array stream) #!+sb-doc "Outputs the printed representation of any array in either the #< or #A form." (if (or *print-array* *print-readably*) (output-array-guts array stream) (output-terse-array array stream))) ;;; to output the abbreviated #< form of an array (defun output-terse-array (array stream) (let ((*print-level* nil) (*print-length* nil)) (print-unreadable-object (array stream :type t :identity t)))) ;;; to output the readable #A form of an array (defun output-array-guts (array stream) (when (and *print-readably* (not (eq (array-element-type array) t))) (error 'print-not-readable :object array)) (write-char #\# stream) (let ((*print-base* 10)) (output-integer (array-rank array) stream)) (write-char #\A stream) (with-array-data ((data array) (start) (end)) (declare (ignore end)) (sub-output-array-guts data (array-dimensions array) stream start))) (defun sub-output-array-guts (array dimensions stream index) (declare (type (simple-array * (*)) array) (fixnum index)) (cond ((null dimensions) (output-object (aref array index) stream)) (t (descend-into (stream) (write-char #\( stream) (let* ((dimension (car dimensions)) (dimensions (cdr dimensions)) (count (reduce #'* dimensions))) (dotimes (i dimension) (unless (zerop i) (write-char #\space stream)) (punt-print-if-too-long i stream) (sub-output-array-guts array dimensions stream index) (incf index count))) (write-char #\) stream))))) ;;; a trivial non-generic-function placeholder for PRINT-OBJECT, for ;;; use until CLOS is set up (at which time it will be replaced with ;;; the real generic function implementation) (defun print-object (instance stream) (default-structure-print instance stream *current-level*)) ;;;; integer, ratio, and complex printing (i.e. everything but floats) (defun output-integer (integer stream) ;; FIXME: This UNLESS form should be pulled out into something like ;; (SANE-PRINT-BASE), along the lines of (SANE-PACKAGE) for the ;; *PACKAGE* variable. (unless (and (fixnump *print-base*) (< 1 *print-base* 37)) (let ((obase *print-base*)) (setq *print-base* 10.) (error "~A is not a reasonable value for *PRINT-BASE*." obase))) (when (and (not (= *print-base* 10.)) *print-radix*) ;; First print leading base information, if any. (write-char #\# stream) (write-char (case *print-base* (2. #\b) (8. #\o) (16. #\x) (T (let ((fixbase *print-base*) (*print-base* 10.) (*print-radix* ())) (sub-output-integer fixbase stream)) #\r)) stream)) ;; Then output a minus sign if the number is negative, then output ;; the absolute value of the number. (cond ((bignump integer) (print-bignum integer stream)) ((< integer 0) (write-char #\- stream) (sub-output-integer (- integer) stream)) (t (sub-output-integer integer stream))) ;; Print any trailing base information, if any. (if (and (= *print-base* 10.) *print-radix*) (write-char #\. stream))) (defun sub-output-integer (integer stream) (let ((quotient ()) (remainder ())) ;; Recurse until you have all the digits pushed on the stack. (if (not (zerop (multiple-value-setq (quotient remainder) (truncate integer *print-base*)))) (sub-output-integer quotient stream)) ;; Then as each recursive call unwinds, turn the digit (in remainder) ;; into a character and output the character. (write-char (code-char (if (and (> remainder 9.) (> *print-base* 10.)) (+ (char-code #\A) (- remainder 10.)) (+ (char-code #\0) remainder))) stream))) ;;;; bignum printing ;;;; ;;;; written by Steven Handerson (based on Skef's idea) ;;;; ;;;; rewritten to remove assumptions about the length of fixnums for the ;;;; MIPS port by William Lott ;;; *BASE-POWER* holds the number that we keep dividing into the bignum for ;;; each *print-base*. We want this number as close to *most-positive-fixnum* ;;; as possible, i.e. (floor (log most-positive-fixnum *print-base*)). (defparameter *base-power* (make-array 37 :initial-element nil)) ;;; *FIXNUM-POWER--1* holds the number of digits for each *print-base* that ;;; fit in the corresponding *base-power*. (defparameter *fixnum-power--1* (make-array 37 :initial-element nil)) ;;; Print the bignum to the stream. We first generate the correct value for ;;; *base-power* and *fixnum-power--1* if we have not already. Then we call ;;; bignum-print-aux to do the printing. (defun print-bignum (big stream) (unless (aref *base-power* *print-base*) (do ((power-1 -1 (1+ power-1)) (new-divisor *print-base* (* new-divisor *print-base*)) (divisor 1 new-divisor)) ((not (fixnump new-divisor)) (setf (aref *base-power* *print-base*) divisor) (setf (aref *fixnum-power--1* *print-base*) power-1)))) (bignum-print-aux (cond ((minusp big) (write-char #\- stream) (- big)) (t big)) (aref *base-power* *print-base*) (aref *fixnum-power--1* *print-base*) stream) big) (defun bignum-print-aux (big divisor power-1 stream) (multiple-value-bind (newbig fix) (truncate big divisor) (if (fixnump newbig) (sub-output-integer newbig stream) (bignum-print-aux newbig divisor power-1 stream)) (do ((zeros power-1 (1- zeros)) (base-power *print-base* (* base-power *print-base*))) ((> base-power fix) (dotimes (i zeros) (write-char #\0 stream)) (sub-output-integer fix stream))))) (defun output-ratio (ratio stream) (when *print-radix* (write-char #\# stream) (case *print-base* (2 (write-char #\b stream)) (8 (write-char #\o stream)) (16 (write-char #\x stream)) (t (write *print-base* :stream stream :radix nil :base 10))) (write-char #\r stream)) (let ((*print-radix* nil)) (output-integer (numerator ratio) stream) (write-char #\/ stream) (output-integer (denominator ratio) stream))) (defun output-complex (complex stream) (write-string "#C(" stream) (output-object (realpart complex) stream) (write-char #\space stream) (output-object (imagpart complex) stream) (write-char #\) stream)) ;;;; float printing ;;;; ;;;; written by Bill Maddox ;;; FLONUM-TO-STRING (and its subsidiary function FLOAT-STRING) does most of ;;; the work for all printing of floating point numbers in the printer and in ;;; FORMAT. It converts a floating point number to a string in a free or ;;; fixed format with no exponent. The interpretation of the arguments is as ;;; follows: ;;; ;;; X - The floating point number to convert, which must not be ;;; negative. ;;; WIDTH - The preferred field width, used to determine the number ;;; of fraction digits to produce if the FDIGITS parameter ;;; is unspecified or NIL. If the non-fraction digits and the ;;; decimal point alone exceed this width, no fraction digits ;;; will be produced unless a non-NIL value of FDIGITS has been ;;; specified. Field overflow is not considerd an error at this ;;; level. ;;; FDIGITS - The number of fractional digits to produce. Insignificant ;;; trailing zeroes may be introduced as needed. May be ;;; unspecified or NIL, in which case as many digits as possible ;;; are generated, subject to the constraint that there are no ;;; trailing zeroes. ;;; SCALE - If this parameter is specified or non-NIL, then the number ;;; printed is (* x (expt 10 scale)). This scaling is exact, ;;; and cannot lose precision. ;;; FMIN - This parameter, if specified or non-NIL, is the minimum ;;; number of fraction digits which will be produced, regardless ;;; of the value of WIDTH or FDIGITS. This feature is used by ;;; the ~E format directive to prevent complete loss of ;;; significance in the printed value due to a bogus choice of ;;; scale factor. ;;; ;;; Most of the optional arguments are for the benefit for FORMAT and are not ;;; used by the printer. ;;; ;;; Returns: ;;; (VALUES DIGIT-STRING DIGIT-LENGTH LEADING-POINT TRAILING-POINT DECPNT) ;;; where the results have the following interpretation: ;;; ;;; DIGIT-STRING - The decimal representation of X, with decimal point. ;;; DIGIT-LENGTH - The length of the string DIGIT-STRING. ;;; LEADING-POINT - True if the first character of DIGIT-STRING is the ;;; decimal point. ;;; TRAILING-POINT - True if the last character of DIGIT-STRING is the ;;; decimal point. ;;; POINT-POS - The position of the digit preceding the decimal ;;; point. Zero indicates point before first digit. ;;; ;;; NOTE: FLONUM-TO-STRING goes to a lot of trouble to guarantee accuracy. ;;; Specifically, the decimal number printed is the closest possible ;;; approximation to the true value of the binary number to be printed from ;;; among all decimal representations with the same number of digits. In ;;; free-format output, i.e. with the number of digits unconstrained, it is ;;; guaranteed that all the information is preserved, so that a properly- ;;; rounding reader can reconstruct the original binary number, bit-for-bit, ;;; from its printed decimal representation. Furthermore, only as many digits ;;; as necessary to satisfy this condition will be printed. ;;; ;;; FLOAT-STRING actually generates the digits for positive numbers. The ;;; algorithm is essentially that of algorithm Dragon4 in "How to Print ;;; Floating-Point Numbers Accurately" by Steele and White. The current ;;; (draft) version of this paper may be found in [CMUC]tradix.press. ;;; DO NOT EVEN THINK OF ATTEMPTING TO UNDERSTAND THIS CODE WITHOUT READING ;;; THE PAPER! (defvar *digits* "0123456789") (defun flonum-to-string (x &optional width fdigits scale fmin) (cond ((zerop x) ;; Zero is a special case which FLOAT-STRING cannot handle. (if fdigits (let ((s (make-string (1+ fdigits) :initial-element #\0))) (setf (schar s 0) #\.) (values s (length s) t (zerop fdigits) 0)) (values "." 1 t t 0))) (t (multiple-value-bind (sig exp) (integer-decode-float x) (let* ((precision (float-precision x)) (digits (float-digits x)) (fudge (- digits precision)) (width (if width (max width 1) nil))) (float-string (ash sig (- fudge)) (+ exp fudge) precision width fdigits scale fmin)))))) (defun float-string (fraction exponent precision width fdigits scale fmin) (let ((r fraction) (s 1) (m- 1) (m+ 1) (k 0) (digits 0) (decpnt 0) (cutoff nil) (roundup nil) u low high (digit-string (make-array 50 :element-type 'base-char :fill-pointer 0 :adjustable t))) ;; Represent fraction as r/s, error bounds as m+/s and m-/s. ;; Rational arithmetic avoids loss of precision in subsequent calculations. (cond ((> exponent 0) (setq r (ash fraction exponent)) (setq m- (ash 1 exponent)) (setq m+ m-)) ((< exponent 0) (setq s (ash 1 (- exponent))))) ;;adjust the error bounds m+ and m- for unequal gaps (when (= fraction (ash 1 precision)) (setq m+ (ash m+ 1)) (setq r (ash r 1)) (setq s (ash s 1))) ;;scale value by requested amount, and update error bounds (when scale (if (minusp scale) (let ((scale-factor (expt 10 (- scale)))) (setq s (* s scale-factor))) (let ((scale-factor (expt 10 scale))) (setq r (* r scale-factor)) (setq m+ (* m+ scale-factor)) (setq m- (* m- scale-factor))))) ;;scale r and s and compute initial k, the base 10 logarithm of r (do () ((>= r (ceiling s 10))) (decf k) (setq r (* r 10)) (setq m- (* m- 10)) (setq m+ (* m+ 10))) (do ()(nil) (do () ((< (+ (ash r 1) m+) (ash s 1))) (setq s (* s 10)) (incf k)) ;;determine number of fraction digits to generate (cond (fdigits ;;use specified number of fraction digits (setq cutoff (- fdigits)) ;;don't allow less than fmin fraction digits (if (and fmin (> cutoff (- fmin))) (setq cutoff (- fmin)))) (width ;;use as many fraction digits as width will permit ;;but force at least fmin digits even if width will be exceeded (if (< k 0) (setq cutoff (- 1 width)) (setq cutoff (1+ (- k width)))) (if (and fmin (> cutoff (- fmin))) (setq cutoff (- fmin))))) ;;If we decided to cut off digit generation before precision has ;;been exhausted, rounding the last digit may cause a carry propagation. ;;We can prevent this, preserving left-to-right digit generation, with ;;a few magical adjustments to m- and m+. Of course, correct rounding ;;is also preserved. (when (or fdigits width) (let ((a (- cutoff k)) (y s)) (if (>= a 0) (dotimes (i a) (setq y (* y 10))) (dotimes (i (- a)) (setq y (ceiling y 10)))) (setq m- (max y m-)) (setq m+ (max y m+)) (when (= m+ y) (setq roundup t)))) (when (< (+ (ash r 1) m+) (ash s 1)) (return))) ;;zero-fill before fraction if no integer part (when (< k 0) (setq decpnt digits) (vector-push-extend #\. digit-string) (dotimes (i (- k)) (incf digits) (vector-push-extend #\0 digit-string))) ;;generate the significant digits (do ()(nil) (decf k) (when (= k -1) (vector-push-extend #\. digit-string) (setq decpnt digits)) (multiple-value-setq (u r) (truncate (* r 10) s)) (setq m- (* m- 10)) (setq m+ (* m+ 10)) (setq low (< (ash r 1) m-)) (if roundup (setq high (>= (ash r 1) (- (ash s 1) m+))) (setq high (> (ash r 1) (- (ash s 1) m+)))) ;;stop when either precision is exhausted or we have printed as many ;;fraction digits as permitted (when (or low high (and cutoff (<= k cutoff))) (return)) (vector-push-extend (char *digits* u) digit-string) (incf digits)) ;; If cutoff occurred before first digit, then no digits are ;; generated at all. (when (or (not cutoff) (>= k cutoff)) ;;last digit may need rounding (vector-push-extend (char *digits* (cond ((and low (not high)) u) ((and high (not low)) (1+ u)) (t (if (<= (ash r 1) s) u (1+ u))))) digit-string) (incf digits)) ;;zero-fill after integer part if no fraction (when (>= k 0) (dotimes (i k) (incf digits) (vector-push-extend #\0 digit-string)) (vector-push-extend #\. digit-string) (setq decpnt digits)) ;;add trailing zeroes to pad fraction if fdigits specified (when fdigits (dotimes (i (- fdigits (- digits decpnt))) (incf digits) (vector-push-extend #\0 digit-string))) ;;all done (values digit-string (1+ digits) (= decpnt 0) (= decpnt digits) decpnt))) ;;; Given a non-negative floating point number, SCALE-EXPONENT returns a new ;;; floating point number Z in the range (0.1, 1.0] and an exponent E such ;;; that Z * 10^E is (approximately) equal to the original number. There may ;;; be some loss of precision due the floating point representation. The ;;; scaling is always done with long float arithmetic, which helps printing of ;;; lesser precisions as well as avoiding generic arithmetic. ;;; ;;; When computing our initial scale factor using EXPT, we pull out part of ;;; the computation to avoid over/under flow. When denormalized, we must pull ;;; out a large factor, since there is more negative exponent range than ;;; positive range. (defun scale-exponent (original-x) (let* ((x (coerce original-x 'long-float))) (multiple-value-bind (sig exponent) (decode-float x) (declare (ignore sig)) (if (= x 0.0l0) (values (float 0.0l0 original-x) 1) (let* ((ex (round (* exponent (log 2l0 10)))) (x (if (minusp ex) (if (float-denormalized-p x) #!-long-float (* x 1.0l16 (expt 10.0l0 (- (- ex) 16))) #!+long-float (* x 1.0l18 (expt 10.0l0 (- (- ex) 18))) (* x 10.0l0 (expt 10.0l0 (- (- ex) 1)))) (/ x 10.0l0 (expt 10.0l0 (1- ex)))))) (do ((d 10.0l0 (* d 10.0l0)) (y x (/ x d)) (ex ex (1+ ex))) ((< y 1.0l0) (do ((m 10.0l0 (* m 10.0l0)) (z y (* y m)) (ex ex (1- ex))) ((>= z 0.1l0) (values (float z original-x) ex)))))))))) ;;;; entry point for the float printer ;;; Entry point for the float printer as called by PRINT, PRIN1, PRINC, ;;; etc. The argument is printed free-format, in either exponential or ;;; non-exponential notation, depending on its magnitude. ;;; ;;; NOTE: When a number is to be printed in exponential format, it is scaled in ;;; floating point. Since precision may be lost in this process, the ;;; guaranteed accuracy properties of FLONUM-TO-STRING are lost. The ;;; difficulty is that FLONUM-TO-STRING performs extensive computations with ;;; integers of similar magnitude to that of the number being printed. For ;;; large exponents, the bignums really get out of hand. If bignum arithmetic ;;; becomes reasonably fast and the exponent range is not too large, then it ;;; might become attractive to handle exponential notation with the same ;;; accuracy as non-exponential notation, using the method described in the ;;; Steele and White paper. ;;; Print the appropriate exponent marker for X and the specified exponent. (defun print-float-exponent (x exp stream) (declare (type float x) (type integer exp) (type stream stream)) (let ((*print-radix* nil) (plusp (plusp exp))) (if (typep x *read-default-float-format*) (unless (eql exp 0) (format stream "e~:[~;+~]~D" plusp exp)) (format stream "~C~:[~;+~]~D" (etypecase x (single-float #\f) (double-float #\d) (short-float #\s) (long-float #\L)) plusp exp)))) ;;; Write out an infinity using #. notation, or flame out if ;;; *print-readably* is true and *read-eval* is false. #!+sb-infinities (defun output-float-infinity (x stream) (declare (type float x) (type stream stream)) (cond (*read-eval* (write-string "#." stream)) (*print-readably* (error 'print-not-readable :object x)) (t (write-string "#<" stream))) (write-string "EXT:" stream) (princ (float-format-name x) stream) (write-string (if (plusp x) "-POSITIVE-" "-NEGATIVE-") stream) (write-string "INFINITY" stream) (unless *read-eval* (write-string ">" stream))) ;;; Output a #< NaN or die trying. (defun output-float-nan (x stream) (print-unreadable-object (x stream) (princ (float-format-name x) stream) (write-string (if (float-trapping-nan-p x) " trapping" " quiet") stream) (write-string " NaN" stream))) ;;; the function called by OUTPUT-OBJECT to handle floats (defun output-float (x stream) (cond ((float-infinity-p x) (output-float-infinity x stream)) ((float-nan-p x) (output-float-nan x stream)) (t (let ((x (cond ((minusp (float-sign x)) (write-char #\- stream) (- x)) (t x)))) (cond ((zerop x) (write-string "0.0" stream) (print-float-exponent x 0 stream)) (t (output-float-aux x stream (float 1/1000 x) (float 10000000 x)))))))) (defun output-float-aux (x stream e-min e-max) (if (and (>= x e-min) (< x e-max)) ;; free format (multiple-value-bind (str len lpoint tpoint) (flonum-to-string x) (declare (ignore len)) (when lpoint (write-char #\0 stream)) (write-string str stream) (when tpoint (write-char #\0 stream)) (print-float-exponent x 0 stream)) ;; exponential format (multiple-value-bind (f ex) (scale-exponent x) (multiple-value-bind (str len lpoint tpoint) (flonum-to-string f nil nil 1) (declare (ignore len)) (when lpoint (write-char #\0 stream)) (write-string str stream) (when tpoint (write-char #\0 stream)) ;; Subtract out scale factor of 1 passed to FLONUM-TO-STRING. (print-float-exponent x (1- ex) stream))))) ;;;; other leaf objects ;;; If *PRINT-ESCAPE* is false, just do a WRITE-CHAR, otherwise output the ;;; character name or the character in the #\char format. (defun output-character (char stream) (if (or *print-escape* *print-readably*) (let ((name (char-name char))) (write-string "#\\" stream) (if name (write-string name stream) (write-char char stream))) (write-char char stream))) (defun output-sap (sap stream) (declare (type system-area-pointer sap)) (cond (*read-eval* (format stream "#.(~S #X~8,'0X)" 'int-sap (sap-int sap))) (t (print-unreadable-object (sap stream) (format stream "system area pointer: #X~8,'0X" (sap-int sap)))))) (defun output-weak-pointer (weak-pointer stream) (declare (type weak-pointer weak-pointer)) (print-unreadable-object (weak-pointer stream) (multiple-value-bind (value validp) (weak-pointer-value weak-pointer) (cond (validp (write-string "weak pointer: " stream) (write value :stream stream)) (t (write-string "broken weak pointer" stream)))))) (defun output-code-component (component stream) (print-unreadable-object (component stream :identity t) (let ((dinfo (%code-debug-info component))) (cond ((eq dinfo :bogus-lra) (write-string "bogus code object" stream)) (t (write-string "code object" stream) (when dinfo (write-char #\space stream) (output-object (sb!c::debug-info-name dinfo) stream))))))) (defun output-lra (lra stream) (print-unreadable-object (lra stream :identity t) (write-string "return PC object" stream))) (defun output-fdefn (fdefn stream) (print-unreadable-object (fdefn stream) (write-string "FDEFINITION object for " stream) (output-object (fdefn-name fdefn) stream))) ;;;; functions ;;; Output OBJECT as using PRINT-OBJECT if it's a ;;; FUNCALLABLE-STANDARD-CLASS, or return NIL otherwise. ;;; ;;; The definition here is a simple temporary placeholder. It will be ;;; overwritten by a smarter version (capable of calling generic ;;; PRINT-OBJECT when appropriate) when CLOS is installed. (defun printed-as-clos-funcallable-standard-class (object stream) (declare (ignore object stream)) nil) (defun output-function (object stream) (let* ((*print-length* 3) ; in case we have to.. (*print-level* 3) ; ..print an interpreted function definition (name (cond ((find (function-subtype object) #(#.sb!vm:closure-header-type #.sb!vm:byte-code-closure-type)) "CLOSURE") ((sb!eval::interpreted-function-p object) (or (sb!eval::interpreted-function-%name object) (sb!eval:interpreted-function-lambda-expression object))) ((find (function-subtype object) #(#.sb!vm:function-header-type #.sb!vm:closure-function-header-type)) (%function-name object)) (t 'no-name-available))) (identified-by-name-p (and (symbolp name) (fboundp name) (eq (fdefinition name) object)))) (print-unreadable-object (object stream :identity (not identified-by-name-p)) (prin1 'function stream) (unless (eq name 'no-name-available) (format stream " ~S" name))))) ;;;; catch-all for unknown things (defun output-random (object stream) (print-unreadable-object (object stream :identity t) (let ((lowtag (get-lowtag object))) (case lowtag (#.sb!vm:other-pointer-type (let ((type (get-type object))) (case type (#.sb!vm:value-cell-header-type (write-string "value cell " stream) (output-object (sb!c:value-cell-ref object) stream)) (t (write-string "unknown pointer object, type=" stream) (let ((*print-base* 16) (*print-radix* t)) (output-integer type stream)))))) ((#.sb!vm:function-pointer-type #.sb!vm:instance-pointer-type #.sb!vm:list-pointer-type) (write-string "unknown pointer object, type=" stream)) (t (case (get-type object) (#.sb!vm:unbound-marker-type (write-string "unbound marker" stream)) (t (write-string "unknown immediate object, lowtag=" stream) (let ((*print-base* 2) (*print-radix* t)) (output-integer lowtag stream)) (write-string ", type=" stream) (let ((*print-base* 16) (*print-radix* t)) (output-integer (get-type object) stream)))))))))