tests/pprint.impure.lisp

   1 ;;;; test of the pretty-printer
   2
   3 ;;;; This software is part of the SBCL system. See the README file for
   4 ;;;; more information.
   5 ;;;;
   6 ;;;; While most of SBCL is derived from the CMU CL system, the test
   7 ;;;; files (like this one) were written from scratch after the fork
   8 ;;;; from CMU CL.
   9 ;;;;
  10 ;;;; This software is in the public domain and is provided with
  11 ;;;; absolutely no warranty. See the COPYING and CREDITS files for
  12 ;;;; more information.
  13
  14 (in-package :cl-user)
  15
  16 ;;;; tests for former BUG 99, where pretty-printing was pretty messed
  17 ;;;; up, e.g. PPRINT-LOGICAL-BLOCK - because of CHECK-FOR-CIRCULARITY
  18 ;;;; - didn't really work:
  19 ;;;;   "DESCRIBE interacts poorly with *PRINT-CIRCLE*, e.g. the output from
  20 ;;;;    (let ((*print-circle* t)) (describe (make-hash-table)))
  21 ;;;;  is weird, [...] #<HASH-TABLE :TEST EQL :COUNT 0 {90BBFC5}> is an . (EQL)
  22 ;;;; ..."
  23 ;;;; So, this was mainly a pretty printing problem.
  24
  25 ;;; Create a circular list.
  26 (eval-when (:compile-toplevel :load-toplevel :execute)
  27   (defparameter *circ-list* '(1 1))
  28   (prog1 nil
  29     (setf (cdr *circ-list*) *circ-list*)))
  30
  31 ;;; I think this test is bogus. PPRINT-LOGICAL-BLOCK needs to print
  32 ;;; the #1= and mark *CIRC-LIST* as having been printed for the first
  33 ;;; time. After that any attempt to print *CIRC-LIST* must result in
  34 ;;; in a #1# being printed. Thus the right output is (for once)
  35 ;;; #1=#1#. -- JES, 2005-06-05
  36 #+nil
  37 ;;; circular lists are still being printed correctly?
  38 (assert (equal
  39          (with-output-to-string (*standard-output*)
  40            (let ((*print-circle* t))
  41              (pprint-logical-block (*standard-output* *circ-list*)
  42                                  (format *standard-output* "~S" *circ-list*))))
  43          "#1=(1 . #1#)"))
  44
  45 ;;; test from CLHS
  46 (with-test (:name :pprint-clhs-example)
  47   (assert (equal
  48            (with-output-to-string (*standard-output*)
  49              (let ((a (list 1 2 3)))
  50                (setf (cdddr a) a)
  51                (let ((*print-circle* t))
  52                  (write a :stream *standard-output*))
  53                :done))
  54            "#1=(1 2 3 . #1#)")))
  55
  56 (with-test (:name (:pprint :bug-99))
  57   (assert (equal
  58            (with-output-to-string (*standard-output*)
  59              (let* ((*print-circle* t))
  60                (format *standard-output* "~@<~S ~_is ~S. This was not seen!~:>"
  61                        'eql 'eql)))
  62            "EQL is EQL. This was not seen!"))
  63
  64   (assert (equal
  65            (with-output-to-string (*standard-output*)
  66              (let* ((*print-circle* t))
  67                (format *standard-output*
  68                        "~@<~S ~_is ~S and ~S. This was not seen!~:>"
  69                        'eql 'eql 'eql)))
  70            "EQL is EQL and EQL. This was not seen!")))
  71
  72 ;;; the original test for BUG 99 (only interactive), no obvious
  73 ;;; way to make an automated test:
  74 ;;;  (LET ((*PRINT-CIRCLE* T)) (DESCRIBE (MAKE-HASH-TABLE)))
  75
  76 ;;; bug 263: :PREFIX, :PER-LINE-PREFIX and :SUFFIX arguments of
  77 ;;; PPRINT-LOGICAL-BLOCK may be complex strings
  78 (with-test (:name :pprint-logical-block-arguments-complex-strings)
  79   (let ((list '(1 2 3))
  80         (prefix (make-array 2
  81                             :element-type 'character
  82                             :displaced-to ";x"
  83                             :fill-pointer 1))
  84         (suffix (make-array 2
  85                             :element-type 'character
  86                             :displaced-to ">xy"
  87                             :displaced-index-offset 1
  88                             :fill-pointer 1)))
  89     (assert (equal (with-output-to-string (s)
  90                      (pprint-logical-block (s list
  91                                               :per-line-prefix prefix
  92                                               :suffix suffix)
  93                        (format s "~{~W~^~:@_~}" list)))
  94                    (format nil ";1~%~
  95                               ;2~%~
  96                               ;3x")))))
  97
  98 ;;; bug 141b: not enough care taken to disambiguate ,.FOO and ,@FOO
  99 ;;; from , .FOO and , @FOO
 100 (with-test (:name :pprint-backquote-magic)
 101   (assert (equal
 102            (with-output-to-string (s)
 103              (write '`(,  .foo) :stream s :pretty t :readably t))
 104            "`(, .FOO)"))
 105   (assert (equal
 106            (with-output-to-string (s)
 107              (write '`(,  @foo) :stream s :pretty t :readably t))
 108            "`(, @FOO)"))
 109   (assert (equal
 110            (with-output-to-string (s)
 111              (write '`(,  ?foo) :stream s :pretty t :readably t))
 112            "`(,?FOO)")))
 113
 114 ;;; bug reported by Paul Dietz on sbcl-devel: unquoted lambda lists
 115 ;;; were leaking the SB-IMPL::BACKQ-COMMA implementation.
 116 (with-test (:name :pprint-leaking-backq-comma)
 117   (assert (equal
 118            (with-output-to-string (s)
 119              (write '`(foo ,x) :stream s :pretty t :readably t))
 120            "`(FOO ,X)"))
 121   (assert (equal
 122            (with-output-to-string (s)
 123              (write '`(foo ,@x) :stream s :pretty t :readably t))
 124            "`(FOO ,@X)"))
 125   #+nil                       ; '`(foo ,.x) => '`(foo ,@x) apparently.
 126   (assert (equal
 127            (with-output-to-string (s)
 128              (write '`(foo ,.x) :stream s :pretty t :readably t))
 129            "`(FOO ,.X)"))
 130   (assert (equal
 131            (with-output-to-string (s)
 132              (write '`(lambda ,x) :stream s :pretty t :readably t))
 133            "`(LAMBDA ,X)"))
 134   (assert (equal
 135            (with-output-to-string (s)
 136              (write '`(lambda ,@x) :stream s :pretty t :readably t))
 137            "`(LAMBDA ,@X)"))
 138   #+nil                                 ; see above
 139   (assert (equal
 140            (with-output-to-string (s)
 141              (write '`(lambda ,.x) :stream s :pretty t :readably t))
 142            "`(LAMBDA ,.X)"))
 143   (assert (equal
 144            (with-output-to-string (s)
 145              (write '`(lambda (,x)) :stream s :pretty t :readably t))
 146            "`(LAMBDA (,X))")))
 147
 148 ;;; more backquote printing brokenness, fixed quasi-randomly by CSR.
 149 ;;; NOTE KLUDGE FIXME: because our backquote optimizes at read-time,
 150 ;;; these assertions, like the ones above, are fragile.  Likewise, it
 151 ;;; is very possible that at some point READABLY printing backquote
 152 ;;; expressions will have to change to printing the low-level conses,
 153 ;;; since the magical symbols are accessible though (car '`(,foo)) and
 154 ;;; friends.  HATE HATE HATE.  -- CSR, 2004-06-10
 155 (with-test (:name :pprint-more-backquote-brokeness)
 156   (assert (equal
 157            (with-output-to-string (s)
 158              (write '``(foo ,@',@bar) :stream s :pretty t))
 159            "``(FOO ,@',@BAR)"))
 160   (assert (equal
 161            (with-output-to-string (s)
 162              (write '``(,,foo ,',foo foo) :stream s :pretty t))
 163            "``(,,FOO ,',FOO FOO)"))
 164   (assert (equal
 165            (with-output-to-string (s)
 166              (write '``(((,,foo) ,',foo) foo) :stream s :pretty t))
 167            "``(((,,FOO) ,',FOO) FOO)")))
 168 \f
 169 ;;; SET-PPRINT-DISPATCH should accept function name arguments, and not
 170 ;;; rush to coerce them to functions.
 171 (set-pprint-dispatch '(cons (eql frob)) 'ppd-function-name)
 172 (defun ppd-function-name (s o)
 173   (print (length o) s))
 174
 175 (with-test (:name (:set-pprint-dispatch :no-function-coerce)))
 176 (let ((s (with-output-to-string (s)
 177            (pprint '(frob a b) s))))
 178   (assert (position #\3 s)))
 179 \f
 180 ;; Test that circularity detection works with pprint-logical-block
 181 ;; (including when called through pprint-dispatch).
 182 (with-test (:name :pprint-circular-detection)
 183   (let ((*print-pretty* t)
 184         (*print-circle* t)
 185         (*print-pprint-dispatch* (copy-pprint-dispatch)))
 186     (labels ((pprint-a (stream form &rest rest)
 187                (declare (ignore rest))
 188                (pprint-logical-block (stream form :prefix "<" :suffix ">")
 189                  (pprint-exit-if-list-exhausted)
 190                  (loop
 191                    (write (pprint-pop) :stream stream)
 192                    (pprint-exit-if-list-exhausted)
 193                    (write-char #\space stream)))))
 194       (set-pprint-dispatch '(cons (eql a)) #'pprint-a)
 195       (assert (string= "<A 1 2 3>"
 196                        (with-output-to-string (s)
 197                          (write '(a 1 2 3) :stream s))))
 198       (assert (string= "#1=<A 1 #1# #2=#(2) #2#>"
 199                        (with-output-to-string (s)
 200                          (write '#2=(a 1 #2# #5=#(2) #5#) :stream s))))
 201       (assert (string= "#1=(B #2=<A 1 #1# 2 3> #2#)"
 202                        (with-output-to-string (s)
 203                          (write '#3=(b #4=(a 1 #3# 2 3) #4#) :stream s)))))))
 204
 205 ;; Test that a circular improper list inside a logical block works.
 206 (with-test (:name :pprint-circular-improper-lists-inside-logical-blocks)
 207   (let ((*print-circle* t)
 208         (*print-pretty* t))
 209     (assert (string= "#1=(#2=(#2# . #3=(#1# . #3#)))"
 210                      (with-output-to-string (s)
 211                        (write '#1=(#2=(#2# . #3=(#1# . #3#))) :stream s))))))
 212
 213 ;;; Printing malformed defpackage forms without errors.
 214 (with-test (:name :pprint-defpackage)
 215   (let ((*standard-output* (make-broadcast-stream)))
 216     (pprint '(defpackage :foo nil))
 217     (pprint '(defpackage :foo 42))))
 218
 219 (with-test (:name :standard-pprint-dispatch-modified)
 220   (assert
 221    (eq :error
 222        (handler-case (with-standard-io-syntax
 223                        (set-pprint-dispatch 'symbol (constantly nil))
 224                        :no-error)
 225          (sb-int:standard-pprint-dispatch-table-modified-error ()
 226            :error)))))
 227
 228 (with-test (:name :pprint-defmethod-lambda-list-function)
 229   (flet ((to-string (form)
 230            (let ((string (with-output-to-string (s) (pprint form s))))
 231              (assert (eql #\newline (char string 0)))
 232              (subseq string 1))))
 233     (assert (equal "(DEFMETHOD FOO ((FUNCTION CONS)) FUNCTION)"
 234                    (to-string `(defmethod foo ((function cons)) function))))
 235     (assert (equal "(DEFMETHOD FOO :AFTER (FUNCTION CONS) FUNCTION)"
 236                    (to-string `(defmethod foo :after (function cons) function))))))
 237
 238 (defclass frob () ())
 239
 240 (defmethod print-object ((obj frob) stream)
 241   (print-unreadable-object (obj stream :type nil :identity nil)
 242     (format stream "FRABOTZICATOR")))
 243
 244 ;;; SBCL < 1.0.38 printed #<\nFRABOTIZICATOR>
 245 (with-test (:name (:pprint-unreadable-object :no-ugliness-when-type=nil))
 246   (assert (equal "#<FRABOTZICATOR>"
 247                  (let ((*print-right-margin* 5)
 248                        (*print-pretty* t))
 249                    (format nil "~@<~S~:>" (make-instance 'frob))))))
 250
 251 (with-test (:name :pprint-logical-block-code-deletion-node)
 252   (handler-case
 253       (compile nil
 254                `(lambda (words &key a b c)
 255                   (pprint-logical-block (nil words :per-line-prefix (or a b c))
 256                     (pprint-fill *standard-output* (sort (copy-seq words) #'string<) nil))))
 257     ((or sb-ext:compiler-note warning) (c)
 258       (error e))))
 259
 260 (with-test (:name :pprint-logical-block-multiple-per-line-prefix-eval)
 261   (funcall (compile nil
 262                     `(lambda ()
 263                        (let ((n 0))
 264                          (with-output-to-string (s)
 265                            (pprint-logical-block (s nil :per-line-prefix (if (eql 1 (incf n))
 266                                                                              "; "
 267                                                                              (error "oops")))
 268                              (pprint-newline :mandatory s)
 269                              (pprint-newline :mandatory s)))
 270                          n)))))
 271
 272 (with-test (:name :can-restore-orig-pprint-dispatch-table)
 273   (let* ((orig (pprint-dispatch 'some-symbol))
 274          (alt (lambda (&rest args) (apply orig args))))
 275     (set-pprint-dispatch 'symbol alt)
 276     (assert (eq alt (pprint-dispatch 'some-symbol)))
 277     (setf *print-pprint-dispatch* (copy-pprint-dispatch nil))
 278     (assert (eq orig (pprint-dispatch 'some-symbol)))
 279     (assert (not (eq alt orig)))))
 280
 281 (with-test (:name :pprint-improper-list)
 282   (let* ((max-length 10)
 283          (stream (make-broadcast-stream))
 284          (errors
 285            (loop for symbol being the symbol in :cl
 286                  nconc
 287                  (loop for i from 1 below max-length
 288                        for list = (cons symbol 10) then (cons symbol list)
 289                        when (nth-value 1 (ignore-errors (pprint list stream)))
 290                        collect (format nil "(~{~a ~}~a . 10)" (butlast list) symbol)))))
 291     (when errors
 292       (error "Can't PPRINT imporper lists: ~a" errors))))
 293
 294 (with-test (:name :pprint-circular-backq-comma)
 295   ;; LP 1161218 reported by James M. Lawrence
 296   (let ((string (write-to-string '(let ((#1=#:var '(99)))
 297                                    `(progn ,@(identity #1#)))
 298                                  :circle t :pretty t)))
 299     (assert (not (search "#2#" string)))))
 300
 301 (with-test (:name :pprint-dotted-setf)
 302   (let ((*print-pretty* t))
 303     (equal (format nil "~a" '(setf . a))
 304            "(SETF . A)")))
 305
 306 \f
 307 ;;; success