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Common Lisp implementation running on the JVM
;;; describe.lisp
;;;
;;; Copyright (C) 2005 Peter Graves
;;; $Id$
;;;
;;; This program is free software; you can redistribute it and/or
;;; modify it under the terms of the GNU General Public License
;;; as published by the Free Software Foundation; either version 2
;;; of the License, or (at your option) any later version.
;;;
;;; This program is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program; if not, write to the Free Software
;;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
;;;
;;; As a special exception, the copyright holders of this library give you
;;; permission to link this library with independent modules to produce an
;;; executable, regardless of the license terms of these independent
;;; modules, and to copy and distribute the resulting executable under
;;; terms of your choice, provided that you also meet, for each linked
;;; independent module, the terms and conditions of the license of that
;;; module. An independent module is a module which is not derived from
;;; or based on this library. If you modify this library, you may extend
;;; this exception to your version of the library, but you are not
;;; obligated to do so. If you do not wish to do so, delete this
;;; exception statement from your version.
(in-package #:system)
(require '#:clos)
(require '#:format)
(defun describe-arglist (object stream)
(multiple-value-bind
(arglist known-p)
(arglist object)
(when known-p
(format stream "~&The function's lambda list is:~% ~A~%" arglist))))
(defun %describe-object (object stream)
(format stream "~S is an object of type ~S.~%" object (type-of object)))
(defun describe (object &optional stream)
(describe-object object (out-synonym-of stream))
(values))
(defmethod describe-object ((object t) stream)
(let ((*print-pretty* t))
(typecase object
(SYMBOL
(let ((package (symbol-package object)))
(if package
(multiple-value-bind
(sym status)
(find-symbol (symbol-name object) package)
(format stream "~S is an ~A symbol in the ~A package.~%"
object
(if (eq status :internal) "internal" "external")
(package-name package)))
(format stream "~S is an uninterned symbol.~%" object))
(cond ((special-variable-p object)
(format stream "It is a ~A; "
(if (constantp object) "constant" "special variable"))
(if (boundp object)
(format stream "its value is ~S.~%" (symbol-value object))
(format stream "it is unbound.~%")))
((boundp object)
(format stream "It is an undefined variable; its value is ~S.~%"
(symbol-value object)))))
(when (autoloadp object)
(resolve object))
(let ((function (and (fboundp object) (symbol-function object))))
(when function
(format stream "Its function binding is ~S.~%" function)
(describe-arglist function stream)))
(let ((doc (documentation object 'function)))
(when doc
(format stream "Function documentation:~% ~A~%" doc)))
(let ((plist (symbol-plist object)))
(when plist
(format stream "The symbol's property list contains these indicator/value pairs:~%")
(loop
(when (null plist) (return))
(format stream " ~S ~S~%" (car plist) (cadr plist))
(setf plist (cddr plist))))))
(FUNCTION
(%describe-object object stream)
(describe-arglist object stream))
(INTEGER
(%describe-object object stream)
(format stream "~D.~%~
#x~X~%~
#o~O~%~
#b~B~%"
object object object object))
(t
(%describe-object object stream))))
(values))
(defmethod describe-object ((object pathname) stream)
(format stream "~S is an object of type ~S:~%" object (type-of object))
(format stream " HOST ~S~%" (pathname-host object))
(format stream " DEVICE ~S~%" (pathname-device object))
(format stream " DIRECTORY ~S~%" (pathname-directory object))
(format stream " NAME ~S~%" (pathname-name object))
(format stream " TYPE ~S~%" (pathname-type object))
(format stream " VERSION ~S~%" (pathname-version object)))
(defun %describe-standard-object/funcallable (object stream)
(let* ((class (class-of object))
(slotds (mop:class-slots class))
(max-slot-name-length 0)
(instance-slotds ())
(class-slotds ()))
(format stream "~S is an instance of ~S.~%" object class)
(dolist (slotd slotds)
(let* ((name (mop:slot-definition-name slotd))
(length (length (symbol-name name))))
(when (> length max-slot-name-length)
(setf max-slot-name-length length)))
(case (mop:slot-definition-allocation slotd)
(:instance (push slotd instance-slotds))
(:class (push slotd class-slotds))))
(setf max-slot-name-length (min (+ max-slot-name-length 3) 30))
(flet ((describe-slot (slot-name)
(if (slot-boundp object slot-name)
(format stream
"~& ~A~VT ~S"
slot-name max-slot-name-length (slot-value object slot-name))
(format stream
"~& ~A~VT unbound"
slot-name max-slot-name-length))))
(when instance-slotds
(format stream "The following slots have :INSTANCE allocation:~%")
(dolist (slotd (nreverse instance-slotds))
(describe-slot
(mop:slot-definition-name slotd))))
(format stream "~%")
(when class-slotds
(format stream "The following slots have :CLASS allocation:~%")
(dolist (slotd (nreverse class-slotds))
(describe-slot
(mop:slot-definition-name slotd)))
(format stream "~%")))))
(defmethod describe-object ((object standard-object) stream)
(%describe-standard-object/funcallable object stream)
(values))
(defmethod describe-object ((object mop:funcallable-standard-object) stream)
(%describe-standard-object/funcallable object stream)
(values))
(defmethod describe-object ((object java:java-object) stream)
(java:describe-java-object object stream))