"Render the object in component,
using DESCRIPTION, which is an occurence, an attribute, or something else entirely."))
-(define-layered-method
- display-using-description (d o c)
- (<:as-html "default :" o))
-
(defun make-display-function (component object
&rest properties
- &key type (line #'line-in)
+ &key (line #'line-in)
&allow-other-keys)
"returns a function that expects a 3 argument function as its argument
-The function (which is usually display-using-description) will be called with the proper environment for display all set up nice n pretty like."
+The function argument (which is usually display-using-description) will be called with the proper environment for display all set up nice n pretty like."
(lambda (function)
(let* ((description (find-occurence object)))
-
(if description
- (dletf (((description.type description) type)
- ((attributes description) (or
- (attributes description)
- (list-slots object))))
+ (dletf (((attributes description)
+ (or
+ (attributes description)
+ (list-attributes description))))
;; apply the default line to the description
(funcall-with-description
description
"Displays OBJECT in COMPONENT."))
(define-layered-method display ((component t) (object t)
- &rest properties
- &key type (line #'line-in)
- &allow-other-keys)
+ &rest properties)
" The default display dispatch method
DISPLAY takes two required arguments,
that is to say the parameters that come together to create the output.
The default display calls out via FUNCALL-WITH-LAYERS to tche DISPLAY-USING-DESCRIPTION method."
-
- (let* ((description (find-occurence object)))
-
- (if description
- (dletf (((description.type description) type)
- ((attributes description) (or
- (attributes description)
- (list-slots object))))
- ;; apply the default line to the description
- (funcall-with-description
- description
- (funcall line object)
- ;; apply the passed in arguments and call display-using-description
- #'(lambda ()
- (funcall-with-description
- description
- properties
- #'display-using-description description object component))))
- (error "no description for ~A" object))))
+ (funcall (apply 'make-display-function component object properties)
+ 'display-using-description))
;;;;; Macros
-
-(defun funcall-with-description (description properties function &rest args)
-
+(defun funcall-with-layers (layers thunk)
+ (let ((context (current-layer-context)))
+ (loop :for (op layer)
+ :on layers :by #'cddr
+ :do (setf context
+ (case op
+ (+ (adjoin-layer layer context))
+ (- (remove-layer layer context)))))
+ (funcall-with-layer-context context thunk)))
+
+
+(defun funcall-with-description (description properties function &rest args)
(if description
- (dletf* (((description.type description) (or
- (getf properties :type)
- (description.type description)))
+ (dletf* (((description-type description)
+ (or
+ (getf properties :type)
+ (description-type description)))
- ((description.layers description) (append
- (description.layers description)
- (getf properties :layers)))
- ((description.properties description) (append (description.properties description) properties)))
+ ((description-layers description)
+ (append
+ (description-layers description)
+ (getf properties :layers)))
+ ((description-properties description) (append (description-properties description) properties)))
(funcall-with-layers
- (description.layers description)
- #'(lambda ()
- (contextl::funcall-with-special-initargs
- (list (cons description properties))
- #'(lambda ()
- (apply function args))))))
+ (description-layers description)
+ (lambda ()
+ (contextl::funcall-with-special-initargs
+ (list (cons description properties))
+ #'(lambda ()
+ (apply function args))))))
(apply function args)))
(defmacro with-description ((description &rest properties) &body body)
(declare (ignorable self))
(flet ((display* (thing &rest args)
(apply #'display ,component thing args))
- (display-attribute (attribute obj &optional props)
+ (display-attribute (attribute obj &rest
+ props)
(if props
(funcall-with-description
attribute props
(declare (ignorable #'display* #'display-attribute))
,@body)))
-(defmacro defdisplay (&body body)
- (loop with in-layerp = (eq (car body) :in-layer)
- with layer = (if in-layerp (cadr body) 't)
- for tail on (if in-layerp (cddr body) body)
- until (listp (car tail))
- collect (car tail) into qualifiers
- finally
- (when (member :in-layer qualifiers)
- (error "Incorrect occurrence of :in-layer in defdisplay. Must occur before qualifiers."))
- (return
- (destructuring-bind (description &optional object component) (car tail)
- (with-unique-names (d c)
- (let (standard-description-p)
- `(define-layered-method
- display-using-description
- :in-layer ,layer
- ,@qualifiers
-
- ,@(unless object
- (setf object description)
- (setf description d)
- nil)
- (,(cond
- ((listp description)
- (setf d (car description))
- description)
- (t
- (setf d description)
- (setf standard-description-p t)
- `(,d description)))
- ,object
- ,(cond
- ((null component)
- `(,c component))
- ((listp component)
- (setf c (car component))
- component)
- (t
- (setf c component)
- `(,c component))))
- (with-component (,c)
- ,@(cdr tail)))))))))
+
HCoop / clinton / lisp-on-lines.git / blobdiff