tests/reader.impure.lisp

   1 ;;;; tests related to the Lisp reader
   2
   3 ;;;; This file is impure because we want to modify the readtable and stuff.
   4
   5 ;;;; This software is part of the SBCL system. See the README file for
   6 ;;;; more information.
   7 ;;;;
   8 ;;;; While most of SBCL is derived from the CMU CL system, the test
   9 ;;;; files (like this one) were written from scratch after the fork
  10 ;;;; from CMU CL.
  11 ;;;;
  12 ;;;; This software is in the public domain and is provided with
  13 ;;;; absolutely no warranty. See the COPYING and CREDITS files for
  14 ;;;; more information.
  15
  16 (load "assertoid.lisp")
  17 (use-package "ASSERTOID")
  18
  19 ;;; Bug 30, involving mistakes in binding the read table, made this
  20 ;;; code fail.
  21 (defun read-vector (stream char)
  22   (declare (ignorable char))
  23   (coerce (read-delimited-list #\] stream t) 'vector))
  24 (set-macro-character #\[ #'read-vector nil)
  25 (set-macro-character #\] (get-macro-character #\)) nil)
  26 (multiple-value-bind (res pos)
  27     (read-from-string "[1 2 3]") ; ==> #(1 2 3), 7
  28   (assert (equalp res #(1 2 3)))
  29   (assert (= pos 7)))
  30 (multiple-value-bind (res pos)
  31     (read-from-string "#\\x") ; ==> #\x, 3
  32   (assert (equalp res #\x))
  33   (assert (= pos 3)))
  34 (multiple-value-bind (res pos)
  35     (read-from-string "[#\\x]")
  36   (assert (equalp res #(#\x)))
  37   (assert (= pos 5)))
  38
  39 ;;; Bug 51b. (try to throw READER-ERRORs when the reader encounters
  40 ;;; dubious input)
  41 (assert (raises-error? (read-from-string "1e1000") reader-error))
  42 (assert (raises-error? (read-from-string "1/0") reader-error))
  43
  44 ;;; Bug reported by Antonio Martinez on comp.lang.lisp 2003-02-03 in
  45 ;;; message <b32da960.0302030640.7d6fc610@posting.google.com>: reading
  46 ;;; circular instances of CLOS classes didn't work:
  47 (defclass box ()
  48   ((value :initarg :value :reader value)))
  49 (defun read-box (stream char)
  50   (declare (ignore char))
  51   (let ((objects (read-delimited-list #\] stream t)))
  52     (unless (= 1 (length objects))
  53       (error "Unknown box reader syntax"))
  54     (make-instance 'box :value (first objects))))
  55 (set-macro-character #\[ 'read-box)
  56 (set-syntax-from-char #\] #\))
  57 (multiple-value-bind (res pos)
  58     (read-from-string "#1=[#1#]")
  59   (assert (eq (value res) res))
  60   (assert (= pos 8)))
  61 ;;; much, much, later (in Feb 2007), CSR noticed that the problem
  62 ;;; still exists for funcallable instances.
  63 (defclass funcallable-box (box sb-mop:funcallable-standard-object) ()
  64   (:metaclass sb-mop:funcallable-standard-class))
  65 (defun read-funcallable-box (stream char)
  66   (declare (ignore char))
  67   (let ((objects (read-delimited-list #\} stream t)))
  68     (unless (= 1 (length objects))
  69       (error "Unknown box reader syntax"))
  70     (make-instance 'funcallable-box :value (first objects))))
  71 (set-macro-character #\{ 'read-funcallable-box)
  72 (set-syntax-from-char #\} #\))
  73 (multiple-value-bind (res pos)
  74     (read-from-string "#1={#1#}")
  75   (assert (eq (value res) res))
  76   (assert (= pos 8)))
  77
  78 ;;; CSR managed to break the #S reader macro in the process of merging
  79 ;;; SB-PCL:CLASS and CL:CLASS -- make sure it works
  80 (defstruct readable-struct a)
  81 (macrolet
  82     ((frob (string)
  83        `(assert (eq (readable-struct-a (read-from-string ,string)) t))))
  84   (frob "#S(READABLE-STRUCT :A T)")
  85   (frob "#S(READABLE-STRUCT A T)")
  86   (frob "#S(READABLE-STRUCT \"A\" T)")
  87   (frob "#S(READABLE-STRUCT #\\A T)")
  88   (frob "#S(READABLE-STRUCT #\\A T :A NIL)"))
  89 (macrolet
  90     ((frob (string)
  91        `(assert (raises-error? (read-from-string ,string) reader-error))))
  92   (frob "#S(READABLE-STRUCT . :A)")
  93   (frob "#S(READABLE-STRUCT :A . T)")
  94   (frob "#S(READABLE-STRUCT :A T . :A)")
  95   (frob "#S(READABLE-STRUCT :A T :A . T)"))
  96
  97 ;;; reported by Henrik Motakef
  98 (defpackage "")
  99 (assert (eq (symbol-package (read-from-string "||::FOO"))
 100             (find-package "")))
 101
 102 ;;; test nested reads, test case by Helmut Eller for cmucl
 103 (defclass my-in-stream (sb-gray:fundamental-character-input-stream)
 104   ((last-char :initarg :last-char)))
 105
 106 (let ((string " a ")
 107       (i 0))
 108   (defmethod sb-gray:stream-read-char ((s my-in-stream))
 109     (with-input-from-string (s "b") (read s))
 110     (with-slots (last-char) s
 111       (cond (last-char (prog1 last-char (setf last-char nil)))
 112              (t (prog1 (aref string i)
 113                   (setq i (mod (1+ i) (length string)))))))))
 114
 115 (defmethod sb-gray:stream-unread-char ((s my-in-stream) char)
 116   (setf (slot-value s 'last-char) char)
 117   nil)
 118
 119 (assert (eq 'a (read (make-instance 'my-in-stream :last-char nil))))
 120
 121 ;;; NIL as the last argument to SET-SYNTAX-FROM-CHAR in compiled code,
 122 ;;; reported by Levente Mészáros
 123 (let ((fun (compile nil '(lambda ()
 124                           (set-syntax-from-char #\{ #\( *readtable* nil)))))
 125   (funcall fun)
 126   (assert (equal '(:ok) (read-from-string "{:ok)"))))
 127
 128 (with-test (:name bad-recursive-read)
 129   ;; This use to signal an unbound-variable error instead.
 130   (assert (eq :error
 131               (handler-case
 132                   (with-input-from-string (s "42")
 133                     (read s t nil t))
 134                 (reader-error (e)
 135                   :error)))))
 136
 137 (with-test (:name standard-readtable-modified)
 138   (macrolet ((test (form &optional op)
 139                `(assert
 140                  (eq :error
 141                      (handler-case
 142                          (progn ,form t)
 143                        (sb-int:standard-readtable-modified-error (e)
 144                          ,@(when op
 145                             `((assert
 146                                (equal ,op (sb-kernel::standard-readtable-modified-operation e)))))
 147                          :error))))))
 148     (let ((rt *readtable*))
 149      (with-standard-io-syntax
 150        (let ((srt *readtable*))
 151          (test (setf (readtable-case srt) :preserve) '(setf readtable-case))
 152          (test (copy-readtable rt srt) 'copy-readtable)
 153          (test (set-syntax-from-char #\a #\a srt rt) 'set-syntax-from-char)
 154          (test (set-macro-character #\a (constantly t) t srt) 'set-macro-character)
 155          (test (make-dispatch-macro-character #\! t srt))
 156          (test (set-dispatch-macro-character #\# #\a (constantly t) srt) 'set-dispatch-macro-character))))))
 157
 158 ;;; THIS SHOULD BE LAST as it frobs the standard readtable
 159 (with-test (:name set-macro-character-nil)
 160   (handler-bind ((sb-int:standard-readtable-modified-error #'continue))
 161     (let ((fun (lambda (&rest args) 'ok)))
 162       ;; NIL means the standard readtable.
 163       (assert (eq t (set-macro-character #\~ fun nil nil)))
 164       (assert (eq fun (get-macro-character #\~ nil)))
 165       (assert (eq t (set-dispatch-macro-character #\# #\~ fun nil)))
 166       (assert (eq fun (get-dispatch-macro-character #\# #\~ nil))))))
 167
 168 ;;; success