;;;; -*- Mode: Lisp; Syntax: ANSI-Common-Lisp; Base: 10 -*-
;;;; *************************************************************************
;;;; FILE IDENTIFICATION
;;;;
;;;; Name:          views.lisp
;;;; Purpose:       View methods for Hyperobjects
;;;; Programmer:    Kevin M. Rosenberg
;;;; Date Started:  Apr 2000
;;;;
;;;; $Id: views.lisp,v 1.7 2002/12/05 18:31:36 kevin Exp $
;;;;
;;;; This file is Copyright (c) 2000-2002 by Kevin M. Rosenberg
;;;;
;;;; *************************************************************************
 
(in-package :hyperobject)

(eval-when (:compile-toplevel :execute)
  (declaim (optimize (speed 2) (safety 2) (compilation-speed 0) (debug 2))))


;;;; *************************************************************************
;;;;  Metaclass Intialization
;;;; *************************************************************************

(defun finalize-hyperlinks (cl)
  (let ((hyperlinks '()))
    (dolist (esd (class-slots cl))
      (awhen (slot-value esd 'hyperlink)
        (push
	 (make-instance 'hyperlink
			:name (slot-definition-name esd)
			:lookup it
			:link-parameters (slot-value esd 'hyperlink-parameters))
	 hyperlinks)))
    (setf (slot-value cl 'hyperlinks) hyperlinks)))


(defun finalize-views (cl)
  "Calculate all view slots for a hyperobject class"
  (let ((fmtstr-text "")
	(fmtstr-html "")
	(fmtstr-xml "")
	(fmtstr-text-labels "")
	(fmtstr-html-labels "")
	(fmtstr-xml-labels "")
	(fmtstr-html-ref "")
	(fmtstr-xml-ref "")
	(fmtstr-html-ref-labels "")
	(fmtstr-xml-ref-labels "")
	(first-field t)
	(value-func '())
	(xmlvalue-func '())
	(classname (class-name cl))
	(package (symbol-package (class-name cl)))
	(hyperlinks nil))
    (declare (ignore classname))
    (check-type (slot-value cl 'print-slots) list)
    (dolist (slot-name (slot-value cl 'print-slots))
      (let ((slot (find-slot-by-name cl slot-name)))
	(unless slot
	  (error "Slot ~A is not found in class ~S" slot-name cl))
	(let ((name (slot-definition-name slot))
	      (namestr (symbol-name (slot-definition-name slot)))
	      (namestr-lower (string-downcase (symbol-name (slot-definition-name slot))))
	      (type (slot-value slot 'ho-type))
	      (print-formatter (slot-value slot 'print-formatter))
	      (value-fmt "~a")
	      (plain-value-func nil)
	      html-str xml-str html-label-str xml-label-str)
	  
	  (when (or (eql type :integer) (eql type :fixnum))
	    (setq value-fmt "~d"))
	  
	  (when (eql type :boolean)
	    (setq value-fmt "~a"))
	  
	  (if first-field
	      (setq first-field nil)
	      (progn
		(string-append fmtstr-text " ")
		(string-append fmtstr-html " ")
		(string-append fmtstr-xml " ")
		(string-append fmtstr-text-labels " ")
		(string-append fmtstr-html-labels " ")
		(string-append fmtstr-xml-labels " ")
		(string-append fmtstr-html-ref " ")
		(string-append fmtstr-xml-ref " ")
		(string-append fmtstr-html-ref-labels " ")
		(string-append fmtstr-xml-ref-labels " ")))
	  
	  (setq html-str (concatenate 'string "<span class=\"" namestr-lower "\">" value-fmt "</span>"))
	  (setq xml-str (concatenate 'string "<" namestr-lower ">" value-fmt "</" namestr-lower ">"))
	  (setq html-label-str (concatenate 'string "<span class=\"label\">" namestr-lower "</span> <span class=\"" namestr-lower "\">" value-fmt "</span>"))
	  (setq xml-label-str (concatenate 'string "<label>" namestr-lower "</label> <" namestr-lower ">" value-fmt "</" namestr-lower ">"))
	  
	  (string-append fmtstr-text value-fmt)
	  (string-append fmtstr-html html-str)
	  (string-append fmtstr-xml xml-str)
	  (string-append fmtstr-text-labels namestr-lower " " value-fmt)
	  (string-append fmtstr-html-labels html-label-str)
	  (string-append fmtstr-xml-labels xml-label-str)
	  
	  (if (slot-value slot 'hyperlink)
	      (progn
		(string-append fmtstr-html-ref "<~~a>" value-fmt "</~~a>")
		(string-append fmtstr-xml-ref "<~~a>" value-fmt "</~~a>")
		(string-append fmtstr-html-ref-labels "<span class=\"label\">" namestr-lower "</span> <~~a>" value-fmt "</~~a>")
		(string-append fmtstr-xml-ref-labels "<label>" namestr-lower "</label> <~~a>" value-fmt "</~~a>")
		(push (make-instance 'hyperlink :name name
				     :lookup (slot-value slot 'hyperlink))
		      hyperlinks))
	      (progn
		(string-append fmtstr-html-ref html-str)
		(string-append fmtstr-xml-ref xml-str)
		(string-append fmtstr-html-ref-labels html-label-str)
		(string-append fmtstr-xml-ref-labels xml-label-str)))
	  
	  (if print-formatter
	      (setq plain-value-func 
		    (list `(,print-formatter (slot-value x ',(intern namestr package)))))
	      (setq plain-value-func 
		    (list `(slot-value x ',(intern namestr package)))))
	  (setq value-func (append value-func plain-value-func))
	  
	  (if (eql type :cdata)
	      (setq xmlvalue-func (append xmlvalue-func (list `(xml-cdata ,@plain-value-func))))
	      (setq xmlvalue-func (append xmlvalue-func plain-value-func)))
	  )))
    
    (setf (slot-value cl 'hyperlinks) hyperlinks)
    
    (if value-func
	(setq value-func `(lambda (x) (values ,@value-func)))
	(setq value-func `(lambda () (values))))
    (setq value-func (compile nil (eval value-func)))
    
    (if xmlvalue-func
	(setq xmlvalue-func `(lambda (x) (values ,@xmlvalue-func)))
	(setq xmlvalue-func `(lambda () (values))))
    (setq xmlvalue-func (compile nil (eval xmlvalue-func)))
    
    (setf (slot-value cl 'fmtstr-text) fmtstr-text)
    (setf (slot-value cl 'fmtstr-html) fmtstr-html)
    (setf (slot-value cl 'fmtstr-xml) fmtstr-xml)
    (setf (slot-value cl 'fmtstr-text-labels) fmtstr-text-labels)
    (setf (slot-value cl 'fmtstr-html-labels) fmtstr-html-labels)
    (setf (slot-value cl 'fmtstr-xml-labels) fmtstr-xml-labels)
    (setf (slot-value cl 'fmtstr-html-ref) fmtstr-html-ref)
    (setf (slot-value cl 'fmtstr-xml-ref) fmtstr-xml-ref)
    (setf (slot-value cl 'fmtstr-html-ref-labels) fmtstr-html-ref-labels)
    (setf (slot-value cl 'fmtstr-xml-ref-labels) fmtstr-xml-ref-labels)
    (setf (slot-value cl 'value-func) value-func)
    (setf (slot-value cl 'xmlvalue-func) xmlvalue-func))
  (values))


;;;; *************************************************************************
;;;;  View Data Format Section
;;;; *************************************************************************

(defparameter *default-textformat* nil)
(defparameter *default-htmlformat* nil)
(defparameter *default-htmlrefformat* nil)
(defparameter *default-xhtmlformat* nil)
(defparameter *default-xhtmlrefformat* nil)
(defparameter *default-xmlformat* nil)
(defparameter *default-xmlrefformat* nil)
(defparameter *default-ie-xmlrefformat* nil)
(defparameter *default-nullformat* nil)
(defparameter *default-init-format?* nil)

(defun make-format-instance (fmt)
  (unless *default-init-format?*
    (setq *default-textformat* (make-instance 'textformat))
    (setq *default-htmlformat* (make-instance 'htmlformat))
    (setq *default-htmlrefformat* (make-instance 'htmlrefformat))
    (setq *default-xhtmlformat* (make-instance 'xhtmlformat))
    (setq *default-xhtmlrefformat* (make-instance 'xhtmlrefformat))
    (setq *default-xmlformat* (make-instance 'xmlformat))
    (setq *default-xmlrefformat* (make-instance 'xmlrefformat))
    (setq *default-ie-xmlrefformat* (make-instance 'ie-xmlrefformat))
    (setq *default-nullformat* (make-instance 'nullformat))
    (setq *default-init-format?* t))
  
  (case fmt
      (:text *default-textformat*)
      (:html *default-htmlformat*)
      (:htmlref *default-htmlrefformat*)
      (:xhtml  *default-xhtmlformat*)
      (:xhtmlref *default-xhtmlrefformat*)
      (:xml  *default-xmlformat*)
      (:xmlref *default-xmlrefformat*)
      (:ie-xmlref *default-ie-xmlrefformat*)
      (:null *default-nullformat*)
      (otherwise *default-textformat*)))
    
;;;; Output format classes for print hyperobject-classes

(defclass dataformat ()
  ((file-start-str :type string :initarg :file-start-str :reader file-start-str)
   (file-end-str :type string :initarg :file-end-str :reader file-end-str)
   (list-start-fmtstr :type string :initarg :list-start-fmtstr :reader list-start-fmtstr)
   (list-start-value-func :type function :initarg :list-start-value-func :reader list-start-value-func)
   (list-start-indent :initarg :list-start-indent :reader list-start-indent)
   (list-end-fmtstr :type string :initarg :list-end-fmtstr :reader list-end-fmtstr)
   (list-end-value-func :type function :initarg :list-end-value-func :reader list-end-value-func)
   (list-end-indent :initarg :list-end-indent :reader list-end-indent)
   (obj-start-fmtstr :type string :initarg :obj-start-fmtstr :reader obj-start-fmtstr)
   (obj-start-value-func :initarg :obj-start-value-func :reader obj-start-value-func)
   (obj-start-indent :initarg :obj-start-indent :reader obj-start-indent)
   (obj-end-fmtstr :type string :initarg :obj-end-fmtstr :reader obj-end-fmtstr)
   (obj-end-value-func :initarg :obj-end-value-func :reader obj-end-value-func)
   (obj-end-indent :initarg :obj-end-indent :reader obj-end-indent)
   (obj-data-indent :initarg :obj-data-indent :reader obj-data-indent)
   (obj-data-fmtstr :initarg :obj-data-fmtstr :reader  obj-data-fmtstr)
   (obj-data-fmtstr-labels :initarg :obj-data-fmtstr-labels :reader  obj-data-fmtstr-labels)
   (obj-data-end-fmtstr :initarg :obj-data-end-fmtstr :reader obj-data-end-fmtstr)
   (obj-data-value-func :initarg :obj-data-value-func :reader obj-data-value-func)
   (link-ref :initarg :link-ref :reader link-ref))
  (:default-initargs :file-start-str nil :file-end-str nil :list-start-fmtstr nil :list-start-value-func nil
		     :list-start-indent nil :list-end-fmtstr nil :list-end-value-func nil :list-end-indent nil
		     :obj-start-fmtstr nil :obj-start-value-func nil :obj-start-indent nil
		     :obj-end-fmtstr nil :obj-end-value-func nil :obj-end-indent nil
		     :obj-data-indent nil :obj-data-fmtstr nil :obj-data-fmtstr-labels nil :obj-data-end-fmtstr nil
		     :obj-data-value-func nil :link-ref nil)
  (:documentation "Parent for all dataformat objects"))

(defclass binaryformat (dataformat)
  ())

(defclass nullformat (dataformat)
  ())

(defun text-list-start-value-func (obj nitems)
  (values (hyperobject-class-title obj) nitems))

(defclass textformat (dataformat) 
  ()	
  (:default-initargs :list-start-fmtstr "~a~P:~%"
    :list-start-value-func #'text-list-start-value-func
    :list-start-indent t
    :obj-data-indent t
    :obj-data-fmtstr #'hyperobject-class-fmtstr-text
    :obj-data-fmtstr-labels #'hyperobject-class-fmtstr-text-labels
    :obj-data-end-fmtstr "~%"
    :obj-data-value-func #'hyperobject-class-value-func))


(defun class-name-of (obj)
  (string-downcase (class-name (class-of obj))))

(defun htmlformat-list-start-value-func (x nitems) 
  (values (hyperobject-class-title x) nitems (class-name-of x)))

(defclass htmlformat (textformat) 
  ()
  (:default-initargs :file-start-str "<html><body>~%"
    :file-end-str "</body><html>~%"
    :list-start-indent t
    :list-start-fmtstr "<p><b>~a~p:</b></p><div class=\"~A\"><ul>~%"
    :list-start-value-func #'htmlformat-list-start-value-func
    :list-end-fmtstr "</ul></div>~%"
    :list-end-indent t
    :list-end-value-func #'identity
    :obj-start-indent t
    :obj-start-fmtstr "<li>"
    :obj-start-value-func #'identity
    :obj-end-indent  t
    :obj-end-fmtstr  "</li>~%"
    :obj-end-value-func #'identity
    :obj-data-indent t
    :obj-data-fmtstr #'hyperobject-class-fmtstr-html-labels
    :obj-data-fmtstr-labels #'hyperobject-class-fmtstr-html-labels
    :obj-data-value-func #'hyperobject-class-value-func))

(defclass xhtmlformat (textformat) 
  ()
  (:default-initargs :file-start-str "<html><body>~%"
    :file-end-str "</body><html>~%"
    :list-start-indent t
    :list-start-fmtstr "<p><b>~a~p:</b></p><div class=\"~A\"><ul>~%"
    :list-start-value-func #'htmlformat-list-start-value-func
    :list-end-fmtstr "</ul></div>~%"
    :list-end-indent t
    :list-end-value-func #'identity
    :obj-start-indent t
    :obj-start-fmtstr "<li>"
    :obj-start-value-func #'identity
    :obj-end-indent  t
    :obj-end-fmtstr  "</li>~%"
    :obj-end-value-func #'identity
    :obj-data-indent t
    :obj-data-fmtstr #'hyperobject-class-fmtstr-html-labels
    :obj-data-fmtstr-labels #'hyperobject-class-fmtstr-html-labels
    :obj-data-value-func #'hyperobject-class-xmlvalue-func))


(defun xmlformat-list-end-value-func (x)
  (format nil "~alist" (class-name-of x)))

(defun xmlformat-list-start-value-func (x nitems) 
  (values (format nil "~alist" (class-name-of x)) (hyperobject-class-title x) nitems))

(defclass xmlformat (textformat) 
  ()
  (:default-initargs :file-start-str "" ; (std-xml-header)
    :list-start-indent  t
    :list-start-fmtstr "<~a><title>~a~p:</title> ~%"
    :list-start-value-func #'xmlformat-list-start-value-func
    :list-end-indent  t
    :list-end-fmtstr "</~a>~%"
    :list-end-value-func #'xmlformat-list-end-value-func
    :obj-start-fmtstr "<~a>"
    :obj-start-value-func #'class-name-of
    :obj-start-indent t
    :obj-end-fmtstr "</~a>~%"
    :obj-end-value-func #'class-name-of
    :obj-end-indent nil
    :obj-data-indent nil
    :obj-data-fmtstr #'hyperobject-class-fmtstr-xml
    :obj-data-fmtstr-labels #'hyperobject-class-fmtstr-xml-labels
    :obj-data-value-func #'hyperobject-class-xmlvalue-func))

(defclass link-ref ()
  ((fmtstr :type function :initarg :fmtstr :accessor fmtstr)
   (fmtstr-labels :type function :initarg :fmtstr-labels :accessor fmtstr-labels)
   (page-name :type string :initarg :page-name :accessor page-name)
   (href-head :type string :initarg :href-head :accessor href-head)
   (href-end :type string :initarg :href-end :accessor href-end)
   (ampersand :type string :initarg :ampersand :accessor ampersand))
  (:default-initargs :fmtstr nil 
    :fmtstr-labels nil 
    :page-name "disp-func1" 
    :href-head nil :href-end nil :ampersand nil)
  (:documentation "Formatting for a linked hyperlink"))

(defclass html-link-ref (link-ref)
  ()
  (:default-initargs :fmtstr #'hyperobject-class-fmtstr-html-ref  
    :fmtstr-labels #'hyperobject-class-fmtstr-html-ref-labels
    :href-head "a href=" 
    :href-end "a" 
    :ampersand "&"))

(defclass xhtml-link-ref (link-ref)
  ()
  (:default-initargs :fmtstr #'hyperobject-class-fmtstr-html-ref  
    :fmtstr-labels #'hyperobject-class-fmtstr-html-ref-labels
    :href-head "a href=" 
    :href-end "a" 
    :ampersand "&amp;"))

(defclass xml-link-ref (link-ref)
  ()
  (:default-initargs :fmtstr #'hyperobject-class-fmtstr-xml-ref 
		     :fmtstr-labels #'hyperobject-class-fmtstr-xml-ref-labels
		     :href-head "xmllink xlink:type=\"simple\" xlink:href=" 
		     :href-end "xmllink" 
		     :ampersand "&amp;")
  (:documentation "Mozilla's and W3's idea of a link with XML"))

(defclass ie-xml-link-ref (xml-link-ref)
  ()
  (:default-initargs :href-head "html:a href=" 
		     :href-end "html:a" )
  (:documentation "Internet Explorer's idea of a link with XML"))


(defclass htmlrefformat (htmlformat)
  ()
  (:default-initargs :link-ref (make-instance 'html-link-ref)))

(defclass xhtmlrefformat (xhtmlformat)
  ()
  (:default-initargs :link-ref (make-instance 'xhtml-link-ref)))

(defclass xmlrefformat (xmlformat)
  ()
  (:default-initargs :link-ref (make-instance 'xml-link-ref)))

(defclass ie-xmlrefformat (xmlformat)
  ()
  (:default-initargs :link-ref (make-instance 'ie-xml-link-ref)))


;;; File Start and Ends

(defgeneric fmt-file-start (fmt s))
(defmethod fmt-file-start ((fmt dataformat) (s stream)))

(defmethod fmt-file-start ((fmt textformat) (s stream))
  (aif (file-start-str fmt)
      (format s it)))

(defgeneric fmt-file-end (fmt s))
(defmethod fmt-file-end ((fmt textformat) (s stream))
  (aif (file-end-str fmt)
	  (format s it)))

;;; List Start and Ends

(defgeneric fmt-list-start (obj fmt s &optional indent num-items))
(defmethod fmt-list-start (x (fmt textformat) (s stream) &optional (indent 0) (num-items 1))
  (if (list-start-indent fmt)
      (indent-spaces indent s))
  (aif (list-start-fmtstr fmt)
	  (apply #'format s it
		 (multiple-value-list
		  (funcall (list-start-value-func fmt) x num-items)))))

(defgeneric fmt-list-end (obj fmt s &optional indent num-items))
(defmethod fmt-list-end (x (fmt textformat) (s stream) &optional (indent 0) (num-items 1))
  (declare (ignore num-items))
  (if (list-end-indent fmt)
      (indent-spaces indent s))
  (aif (list-end-fmtstr fmt)
	  (apply #'format s it
		 (multiple-value-list
		  (funcall (list-end-value-func fmt) x)))))

;;; Object Start and Ends

(defgeneric fmt-obj-start (obj fmt s &optional indent))
(defmethod fmt-obj-start (x (fmt textformat) (s stream) &optional (indent 0))
  (if (obj-start-indent fmt)
      (indent-spaces indent s))
  (aif (obj-start-fmtstr fmt)
	  (apply #'format s it
		 (multiple-value-list
		  (funcall (obj-start-value-func fmt) x)))))

(defgeneric fmt-obj-end (obj fmt s &optional indent))
(defmethod fmt-obj-end (x (fmt textformat) (s stream) &optional (indent 0))
  (if (obj-end-indent fmt)
      (indent-spaces indent s))
  (aif (obj-end-fmtstr fmt)
	  (apply #'format s it
		 (multiple-value-list
		  (funcall (obj-end-value-func fmt) x)))))
  
;;; Object Data 

(defgeneric make-link-start (obj ref fieldname fieldfunc fieldvalue refvars))
(defmethod make-link-start (obj (ref link-ref) fieldname fieldfunc fieldvalue refvars)
  (declare (ignore obj fieldname))
  (format nil "~a\"~a?func=~a~akey=~a~a\"" 
	  (href-head ref) (make-url (page-name ref)) fieldfunc 
	  (ampersand ref) fieldvalue
	  (if refvars
	      (let ((varstr ""))
		(dolist (var refvars)
		  (string-append varstr (format nil "~a~a=~a" 
						(ampersand ref) (car var) (cadr var))))
		varstr)
	    "")))

(defgeneric make-link-end (obj ref fieldname)) 
(defmethod make-link-end (obj (ref link-ref) fieldname)
  (declare (ignore obj fieldname))
  (format nil "~a" (href-end ref))
  )

(defgeneric fmt-obj-data (obj fmt s &optional indent label refvars))
(defmethod fmt-obj-data (x (fmt textformat) s
			 &optional (indent 0) (label nil) (refvars nil))
  (if (obj-data-indent fmt)
      (indent-spaces indent s))
  (if (link-ref fmt)
      (fmt-obj-data-with-ref x fmt s label refvars)
    (fmt-obj-data-plain x fmt s label))
  (aif (obj-data-end-fmtstr fmt)
       (format s it)))

(defgeneric fmt-obj-data-plain (obj fmt s label))
(defmethod fmt-obj-data-plain (x (fmt textformat) s label)
  (if label
      (apply #'format s
	     (funcall (obj-data-fmtstr-labels fmt) x)
	     (multiple-value-list 
	      (funcall (funcall (obj-data-value-func fmt) x) x)))
    (apply #'format s (funcall (obj-data-fmtstr fmt) x)
	   (multiple-value-list
	    (funcall (funcall (obj-data-value-func fmt) x) x)))))

(defgeneric fmt-obj-data-with-ref (obj fmt s label refvars))
(defmethod fmt-obj-data-with-ref (x (fmt textformat) s label refvars)
  (let ((refstr (make-ref-data-str x fmt label))
	(refvalues nil)
	(field-values 
	 (multiple-value-list
	  (funcall (funcall (obj-data-value-func fmt) x) x))))
    
    ;; make list of hyperlink link fields for printing to refstr template
    (dolist (ref (hyperobject-class-hyperlinks x))
      (let ((link-start 
	     (make-link-start x (link-ref fmt) (name ref) (lookup ref)
			      (nth (position (name ref)
					     (slot-value x 'print-slots))
				   field-values)  
			      (append (link-parameters ref) refvars)))
	    (link-end (make-link-end x (link-ref fmt) (name ref))))
	(push link-start refvalues)
	(push link-end refvalues)))
    (setq refvalues (nreverse refvalues))
    
    (apply #'format s refstr refvalues)))

(defgeneric obj-data (obj))
(defmethod obj-data (x)
  "Returns the objects data as a string. Used by common-graphics outline function"
  (let ((fmt (make-format-instance :text)))
    (apply #'format nil (funcall (obj-data-fmtstr fmt) x)
	   (multiple-value-list 
	    (funcall (funcall (obj-data-value-func fmt) x) x)))))

(defgeneric make-ref-data-str (obj fmt &optional label))
(defmethod make-ref-data-str (x (fmt textformat) &optional (label nil))
  "Return fmt string for that contains ~a slots for hyperlink link start and end"
  (unless (link-ref fmt)
    (error "fmt does not contain a link-ref"))
  (let ((refstr 
	 (if label
	     (apply #'format nil (funcall (fmtstr-labels (link-ref fmt)) x)
		    (multiple-value-list
		      (funcall (funcall (obj-data-value-func fmt) x) x)))
	   (apply #'format nil (funcall (fmtstr (link-ref fmt)) x)
		  (multiple-value-list (funcall (funcall (obj-data-value-func fmt) x) x))))))
    refstr))
  
;;; Display method for objects


(defgeneric load-all-subobjects (objs))
(defmethod load-all-subobjects (objs)
  "Load all subobjects if they have not already been loaded."
  (when objs
    (let ((objlist (mklist objs)))
      (dolist (obj objlist)
        (awhen (hyperobject-class-subobjects obj)  ;; access list of functions
          (dolist (child-obj it)   ;; for each child function
            (awhen (funcall (reader child-obj) obj)
              (load-all-subobjects it))))))
    objs))

(defgeneric view-hyperobject (objs fmt strm
				  &optional label english-only-function
				  indent subobjects refvars))

(defmethod view-hyperobject (objs (fmt dataformat) (strm stream) 
				 &optional (label nil) (indent 0)
				 (english-only-function nil)
				 (subobjects nil) (refvars nil))
"Display a single or list of hyperobject-class instances and their subobjects"
  (when objs
    (setq objs (mklist objs))
    (let ((nobjs (length objs)))
      (fmt-list-start (car objs) fmt strm indent nobjs)
      (dolist (obj objs)
        (unless (and english-only-function
		  (multiple-value-bind (eng term) (funcall english-only-function obj)
		    (and term (not eng))))
          (fmt-obj-start obj fmt strm indent)
          (fmt-obj-data obj fmt strm (1+ indent) label refvars)
          (if subobjects
              (awhen (hyperobject-class-subobjects obj)  ;; access list of functions
                        (dolist (child-obj it)   ;; for each child function
                          (awhen (funcall (reader child-obj) obj) ;; access set of child objects
                                    (view-hyperobject it fmt strm label 
                                                     (1+ indent) english-only-function
						     subobjects refvars)))))
          (fmt-obj-end obj fmt strm indent)))
      (fmt-list-end (car objs) fmt strm indent nobjs))
    t))


(defun view (objs &key (os *standard-output*) (format :text)
		      (label nil) (english-only-function nil)
		      (subobjects nil) (file-wrapper t) (refvars nil))
  "EXPORTED Function: prints hyperobject-class objects. Simplies call to view-hyperobject"
  (let ((fmt (make-format-instance format)))
    (if file-wrapper
	(fmt-file-start fmt os))
    (when objs
      (view-hyperobject objs fmt os label 0 english-only-function subobjects refvars))
    (if file-wrapper
	(fmt-file-end fmt os)))
  objs)


;;; Misc formatting

(defun fmt-comma-integer (i)
  (format nil "~:d" i))