src/mewa/mewa.lisp

   1
   2 (in-package :mewa)
   3
   4 (defparameter *default-type* :ucw)
   5
   6 ;;; maps meta-model slot-types to slot-presentation
   7 (defparameter *slot-type-map*
   8   '(boolean   ucw::mewa-boolean
   9     string    ucw::mewa-string
  10     number    ucw::mewa-currency
  11     integer   ucw::mewa-integer
  12     currency  ucw::mewa-currency
  13     ))
  14
  15 ;;; an alist of model-class-name . attributes
  16 ;;; should really be a hash-table.
  17 (defvar *attribute-map* (list))
  18
  19 ;;; some utilities for merging plists
  20
  21 (defun plist-nunion (new-props plist)
  22   (loop for cons on new-props by #'cddr
  23         do (setf (getf plist (first cons)) (second cons))
  24         finally (return plist)))
  25
  26 (defun plist-union (new-props plist)
  27   "Non-destructive version of plist-nunion"
  28                    (plist-nunion new-props (copy-list plist)))
  29
  30 (defun gen-ptype (type)
  31   (or (getf *slot-type-map* type) type))
  32
  33 (defun gen-presentation-slots (instance)
  34   (mapcar #'(lambda (x) (gen-pslot (cadr x)
  35                                    (string (car x))
  36                                    (car x)))
  37           (meta-model:list-slot-types instance)))
  38
  39
  40 (defun gen-pslot (type label slot-name)
  41   (copy-list `(,(gen-ptype type)
  42                :label ,label
  43                :slot-name ,slot-name)))
  44
  45 (defun gen-presentation-args (instance args)
  46   (declare (ignore instance))
  47   (if args args nil))
  48
  49
  50 (defun find-or-create-attributes (class-name)
  51   "return an exisiting class attribute map or create one.
  52
  53 A map is a cons of class-name . attributes.
  54 attributes is an alist keyed on the attribute nreeame."
  55   (or (assoc class-name *attribute-map*)
  56       (progn
  57         (setf *attribute-map* (acons class-name (list (list)) *attribute-map*))
  58         (assoc class-name *attribute-map*))))
  59
  60 (defgeneric find-class-attributes (class))
  61
  62 (defmethod find-class-attributes ((model t))
  63   (find-or-create-attributes (class-name (class-of model))))
  64
  65 (defmethod find-class-attributes ((model symbol))
  66   (find-or-create-attributes model))
  67
  68 (defmethod clear-class-attributes ((model t))
  69   (setf (cdr (find-class-attributes model)) nil))
  70
  71 (defmethod add-attribute ((model t) name def)
  72   (let ((map (find-class-attributes model)))
  73     (setf (cdr map) (acons name def (cdr map)))))
  74
  75 (defmethod find-attribute ((model t) name)
  76   (assoc name (cdr (find-class-attributes model))))
  77
  78 (defmethod (setf find-attribute) ((def list) (model t) name)
  79   (let ((attr (find-attribute model name)))
  80     (if attr
  81         (prog2
  82             (setf (cdr attr) def)
  83             attr)
  84         (prog2
  85             (add-attribute model name def)
  86             (find-attribute model name)))))
  87
  88 (defmethod set-attribute ((model t) name definition &key (inherit t))
  89   (setf (find-attribute model name)
  90         (if inherit
  91             (cons (car definition)
  92                   (plist-union (cdr definition)
  93                          (cddr (find-attribute model name))))
  94             definition)))
  95
  96 (defmethod perform-set-attributes ((model t) definitions)
  97   (dolist (def definitions)
  98     (funcall #'set-attribute model (first def) (rest def))))
  99
 100
 101 (defmethod set-attribute-properties ((model t) attribute properties)
 102   (let ((a (find-attribute model attribute)))
 103     (if a
 104         (setf (cddr a) (plist-nunion properties (cddr a)))
 105         (error "Attribute ~A does not exist" attribute) )))
 106
 107 (defmethod perform-set-attribute-properties ((model t) definitions)
 108   (dolist (def definitions)
 109     (funcall #'set-attribute-properties model (car def) (cdr def))))
 110
 111
 112
 113
 114
 115 (defmethod default-attributes ((model t))
 116   "return the default attributes for a given model using the meta-model's meta-data"
 117   (append (mapcar #'(lambda (s)
 118                       (cons (car s)
 119                             (gen-pslot
 120                              (if (meta-model:foreign-key-p model (car s))
 121                                  'ucw::foreign-key
 122                                  (cadr s))
 123                              (string (car s)) (car s))))
 124                   (meta-model:list-slot-types model))
 125           (mapcar #'(lambda (s)
 126                       (cons s (append (gen-pslot 'ucw::has-many (string s) s)
 127                                       `(:presentation
 128                                         (make-presentation
 129                                          ,model
 130                                          :type :one-line)))))
 131                   (meta-model:list-has-many model))))
 132
 133 (defmethod set-default-attributes ((model t))
 134   (clear-class-attributes model)
 135   (mapcar #'(lambda (x)
 136               (setf (find-attribute model (car x)) (cdr x)))
 137           (default-attributes model)))
 138
 139
 140 (defgeneric attributes-getter (model))
 141
 142 ;;;presentations
 143
 144
 145
 146
 147 (defcomponent mewa ()
 148   ((attributes
 149     :initarg :attributes
 150     :accessor attributes
 151     :initform nil)
 152    (attributes-getter
 153     :accessor attributes-getter
 154     :initform #'get-attributes
 155     :initarg :attributes-getter)
 156    (global-properties
 157     :initarg :global-properties
 158     :accessor global-properties
 159     :initform nil)
 160    (classes
 161     :initarg :classes
 162     :accessor classes
 163     :initform nil)
 164    (use-instance-class-p
 165     :initarg :use-instance-class-p
 166     :accessor use-instance-class-p
 167     :initform t)
 168    (initializedp :initform nil)
 169    (modifiedp :accessor modifiedp :initform nil)
 170    (modifications :accessor modifications :initform nil)))
 171
 172
 173 (defmethod attributes :around ((self mewa))
 174   (let ((a (call-next-method)))
 175     (or a (funcall (attributes-getter self) self))))
 176
 177 (defgeneric get-attributes (mewa))
 178
 179 (defmethod get-attributes ((self mewa))
 180   (if (instance self)
 181   (append (meta-model:list-slots (instance self))
 182           (meta-model:list-has-many (instance self)))
 183   nil))
 184
 185
 186 (defmethod find-instance-classes ((self mewa))
 187   (mapcar #'class-name
 188           (it.bese.arnesi.mopp:compute-class-precedence-list (class-of (instance self)))))
 189
 190 (defmethod find-all-attributes ((self mewa))
 191   (reduce #'append
 192           (mapcar #'(lambda (x)
 193                       (cdr (find-class-attributes x)))
 194                   (classes self))))
 195
 196 (defun make-attribute (&rest props &key type &allow-other-keys)
 197         (remf props :type)
 198         (cons (gensym) (cons type props)))
 199
 200
 201 (defmethod find-applicable-attributes ((self mewa))
 202   (let ((all-attributes (find-all-attributes self)))
 203     (flet ((gen-att (x) (let ((att (assoc x all-attributes)))
 204                                      (when att
 205                                        (setf (cddr att) (plist-union (global-properties self) (cddr att)))
 206                                        att))))
 207     (if (attributes self)
 208         (remove 'nil
 209                 (mapcar #'(lambda (x)
 210                             (cond
 211                              ;;simple casee
 212                              ((symbolp x)
 213                               (gen-att x))
 214                              ;;if the car is a keyword then this is an inline def
 215                              ((and (listp x) (keywordp (car x)))
 216                               (let ((att (apply #'make-attribute x)))
 217                                 (setf (cddr att)
 218                                       (plist-union (cddr att) (global-properties self)))
 219                                 att))
 220                              ;; if the plist has a :type
 221                              ((and (listp x) (getf (cdr x) :type))
 222                               (let ((new (cdr (apply #'make-attribute (cdr x))))
 223                                     (def (gen-att (car x))))
 224                                 (setf (cdr new) (plist-union (cdr new) (cddr def)))
 225                                 (cons (car def) new)))
 226                              ;;finally if we are just overiding the props
 227                              ((and (listp x) (symbolp (car x)))
 228                               (let ((new (cdr (apply #'make-attribute (cdr x))))
 229                                     (def (gen-att (car x))))
 230                                 (setf (cdr new) (plist-union (cdr new) (cddr def)))
 231                                 (cons (car def) (cons (second def) (cdr new)))))
 232
 233                               )
 234                              )
 235
 236                         (attributes self)))
 237       all-attributes))))
 238
 239 (defmethod find-slot-presentations ((self mewa))
 240   (mapcar #'(lambda (s)
 241               (let ((class-name (or (gethash (second s) ucw::*slot-type-mapping*) 'mewa-object-presentation)))
 242               (apply #'make-instance
 243                      class-name
 244                      (append (cddr s) (list :parent self :size 30)))))
 245           (find-applicable-attributes self)))
 246
 247
 248
 249 (defmethod initialize-slots ((self mewa))
 250   (when (use-instance-class-p self)
 251     (setf (classes self)
 252           (append (find-instance-classes self)
 253                   (classes self))))
 254   (setf (slots self) (find-slot-presentations   self)))
 255
 256
 257 (defmethod make-presentation ((object t) &key (type :viewer) (initargs nil))
 258   (let* ((p (make-instance 'mewa-object-presentation))
 259          (a (progn (setf (slot-value p 'instance) object)
 260                    (initialize-slots p)
 261                    (assoc type (find-all-attributes p))))
 262
 263          (i (apply #'make-instance (second a) (plist-union initargs (cddr a)))))
 264     (setf (slot-value i 'instance) object)
 265     i))
 266
 267 (defmethod make-presentation ((object t) &key (type :viewer) (initargs nil))
 268   (let* ((p (make-instance 'mewa-object-presentation))
 269          (a (progn (setf (slot-value p 'instance) object)
 270                    (initialize-slots p)
 271                    (assoc type (find-all-attributes p))))
 272
 273          (i (apply #'make-instance (or (second a)
 274                                        ;; if we didnt find the type,
 275                                        ;; use the symbol as a class.
 276                                        (if (eql (symbol-package type)
 277                                                 (find-package 'keyword))
 278                                            (symbol-name type)
 279                                            type))
 280                                        (plist-union initargs (cddr a)))))
 281     (setf (slot-value i 'instance) object)
 282     (initialize-slots i)
 283     (setf (slot-value i 'initializedp) t)
 284     i))
 285
 286
 287
 288
 289
 290 (defmethod call-component :before ((from standard-component) (to mewa))
 291   (unless (slot-value to 'initializedp)
 292     (initialize-slots to))
 293   (setf (slot-value to 'initializedp) t)
 294   (setf (slots to) (mapcar #'(lambda (x) (prog2
 295                                              (setf (component.place x) (component.place from))
 296                                              x))
 297                             (slots to))))
 298
 299 (defmacro call-presentation (object &rest args)
 300   `(present-object ,object :presentation (make-presentation ,object ,@args)))
 301
 302
 303 (defcomponent about-dialog (option-dialog)
 304   ((body :initarg :body)))
 305
 306 (defmethod render-on ((res response) (self about-dialog))
 307   (call-next-method)
 308   (render-on res (slot-value self 'body)))
 309
 310 (defaction cancel-save-instance ((self mewa))
 311   (cond
 312     ((slot-value (instance self) 'clsql-sys::view-database)
 313       (meta-model::update-instance-from-records (instance self))
 314       (answer self))
 315     (t (answer nil))))
 316
 317 (defaction save-instance ((self mewa))
 318   (meta-model:sync-instance (instance self))
 319    (setf (modifiedp self) nil)
 320        (answer self))
 321
 322
 323 (defaction ensure-instance-sync ((self mewa))
 324   (when (modifiedp self)
 325     (let ((message (format nil "Record has been modified, Do you wish to save the changes?<br/> ~a" (print (modifications self)))))
 326       (case (call 'about-dialog
 327                   :body (make-presentation (instance self)
 328                                            :type :viewer)
 329                   :message message
 330                   :options '((:save . "Save changes to Database")
 331                              (:cancel . "Cancel all changes")))
 332         (:cancel
 333          (cancel-save-instance self))
 334         (:save
 335          (save-instance self))))))
 336
 337 (defaction ok ((self mewa) &optional arg)
 338   "Returns the component if it has not been modified. if it has been, prompt user to save or cancel"
 339   (declare (ignore arg))
 340   (ensure-instance-sync self)
 341   (answer self))
 342
 343 (defmethod (setf presentation-slot-value) :around (value (slot slot-presentation) instance)
 344   (let* ((old (prog1
 345                  (presentation-slot-value slot instance)
 346                (call-next-method)))
 347         (new (presentation-slot-value slot instance)))
 348
 349   (unless (equal new old )
 350     (let ((self (ucw::parent slot)))
 351       (setf (modifiedp self) instance
 352             (modifications self)  (append (list new old value slot instance) (modifications self)))))))
 353
 354
 355 ;; This software is Copyright (c) Drew Crampsie, 2004-2005.
 356 ;; You are granted the rights to distribute
 357 ;; and use this software as governed by the terms
 358 ;; of the Lisp Lesser GNU Public License
 359 ;; (http://opensource.franz.com/preamble.html),
 360 ;; known as the LLGPL.