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1 | (in-package :lisp-on-lines) |
2 | |
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3 | ;;;; * DESCRIPTIONS |
4 | ;;;; A description is an object which is used |
5 | ;;;; to describe another object. |
6 | |
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7 | |
8 | ;;; #+HACK |
9 | ;;; I'm having some 'issues' with |
10 | ;;; compiled code and my initialization. |
11 | ;;; So this hack initializes the world. |
12 | (eval-when (:compile-toplevel :load-toplevel :execute) |
13 | (defparameter *defined-descriptions* nil)) |
14 | |
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15 | (define-layered-class description-access-class (standard-layer-class contextl::special-layered-access-class ) |
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16 | ((defined-in-descriptions :initarg :in-description) |
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17 | (class-active-attributes-definition :initarg :attributes) |
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18 | (mixin-class-p :initarg :mixinp))) |
19 | |
20 | (defmethod direct-slot-definition-class |
21 | ((class description-access-class) &key &allow-other-keys) |
22 | (find-class 'direct-attribute-definition-class)) |
23 | |
24 | (defmethod effective-slot-definition-class |
25 | ((class description-access-class) &key &allow-other-keys) |
26 | (find-class 'effective-attribute-definition-class)) |
27 | |
28 | (defmethod compute-effective-slot-definition |
29 | ((class description-access-class) name direct-slot-definitions) |
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30 | (declare (ignore name)) |
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31 | (let ((attribute (call-next-method))) |
32 | (setf (attribute-direct-attributes attribute) direct-slot-definitions) |
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33 | (setf (attribute-object-initargs attribute) |
34 | ;; This plist will be used to init the attribute object |
35 | ;; Once the description itself is properly initiated. |
36 | (list :name name |
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37 | 'effective-attribute attribute)) |
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38 | attribute)) |
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39 | |
40 | (defmethod slot-value-using-class ((class description-access-class) object slotd) |
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41 | (call-next-method) |
42 | #+nil (if (or |
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43 | (eq (slot-definition-name slotd) 'described-object) |
44 | (not (slot-boundp slotd 'attribute-object))) |
45 | (call-next-method) |
46 | (slot-definition-attribute-object slotd))) |
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47 | |
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48 | |
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49 | (eval-when (:compile-toplevel :load-toplevel :execute) |
50 | (defparameter *description-attributes* (make-hash-table))) |
51 | |
52 | |
53 | |
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54 | (defclass standard-description-class (description-access-class layered-class) |
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55 | ((attributes :accessor description-class-attributes :initform (list))) |
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56 | (:default-initargs :defining-metaclass 'description-access-class)) |
57 | |
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58 | |
59 | |
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60 | (defmethod validate-superclass |
61 | ((class standard-description-class) |
62 | (superclass standard-class)) |
63 | t) |
64 | |
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65 | (define-layered-class standard-description-object (standard-layer-object) |
66 | ((described-object :accessor described-object |
67 | :special t))) |
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68 | |
69 | (defun description-class-name (description-class) |
70 | (read-from-string (symbol-name (class-name description-class)))) |
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71 | |
72 | (defgeneric standard-description-p (description-candidate) |
73 | (:method (not-description) |
74 | NIL) |
75 | (:method ((description standard-description-object)) |
76 | T)) |
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77 | |
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78 | (defun compute-effective-attribute-objects (description) |
79 | (mapcar |
80 | (lambda (slot) |
81 | (or (find-attribute description |
82 | (slot-definition-name slot) nil) |
83 | (let* ((*init-time-description* description) |
84 | (attribute-class (or |
85 | (ignore-errors |
86 | (slot-value-using-class |
87 | (class-of description) description slot)) |
88 | 'standard-attribute)) |
89 | (attribute |
90 | (apply #'make-instance |
91 | attribute-class |
92 | :description description |
93 | :attribute-class attribute-class |
94 | (attribute-object-initargs slot)))) |
95 | (setf (slot-definition-attribute-object slot) attribute)))) |
96 | (remove 'described-object (class-slots (class-of description)) |
97 | :key #'slot-definition-name))) |
98 | |
99 | (defun initialize-effective-attribute-values-for-description-class (class description attribute-objects) |
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100 | |
101 | (loop |
102 | :for (layer class) |
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103 | :on (partial-class-defining-classes class) :by #'cddr |
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104 | :do (funcall-with-layer-context |
105 | (adjoin-layer (find-layer layer) (current-layer-context)) |
106 | (lambda () |
107 | (loop :for direct-slot :in (class-direct-slots class) |
108 | :do (let ((attribute |
109 | (find (slot-definition-name direct-slot) |
110 | attribute-objects |
111 | :key #'attribute-name))) |
112 | (let ((initargs |
113 | (prepare-initargs attribute (direct-attribute-properties direct-slot)))) |
114 | |
115 | (apply #'reinitialize-instance attribute |
116 | initargs ) |
117 | (setf (slot-value description (attribute-name attribute)) |
118 | (attribute-class attribute)) |
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119 | (apply #'change-class attribute (find-class (attribute-class attribute)) |
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120 | initargs)))) |
121 | (when (slot-boundp class 'class-active-attributes-definition) |
122 | (with-described-object (nil description) |
123 | (setf (slot-value (find-attribute description 'active-attributes) 'value) |
124 | (slot-value class 'class-active-attributes-definition)))))))) |
125 | |
126 | (defun initialize-description-class (class) |
127 | |
128 | ;;; HACK: initialization does not happ en properly |
129 | ;;; when compiling and loading or something like that. |
130 | ;;; Obviously i'm not sure why. |
131 | ;;; So we're going to explicitly initialize things. |
132 | ;;; For now. --drewc |
133 | |
134 | (pushnew class *defined-descriptions*) |
135 | |
136 | ;;; ENDHACK. |
137 | |
138 | (let* ((description (find-layer class)) |
139 | (attribute-objects |
140 | (setf (description-class-attributes (class-of description)) |
141 | (compute-effective-attribute-objects description)))) |
142 | |
143 | (initialize-effective-attribute-values-for-description-class class description attribute-objects) |
144 | )) |
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145 | |
146 | |
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147 | |
148 | ;;;; HACK: run this at startup till we figure things out. |
149 | (defun initialize-descriptions () |
150 | (map nil #'initialize-description-class |
151 | (setf *defined-descriptions* |
152 | (remove-duplicates *defined-descriptions*)))) |
153 | |
154 | (defmethod initialize-instance :around ((class standard-description-class) &rest initargs &key (direct-superclasses '())) |
155 | (declare (dynamic-extent initargs)) |
156 | (prog1 |
157 | (if (loop for direct-superclass in direct-superclasses |
158 | thereis (ignore-errors (subtypep direct-superclass 'standard-description-object))) |
159 | (call-next-method) |
160 | (apply #'call-next-method |
161 | class |
162 | :direct-superclasses |
163 | (append direct-superclasses |
164 | (list (find-class 'standard-description-object))) |
165 | initargs)) |
166 | (initialize-description-class class))) |
167 | |
168 | |
169 | (defmethod reinitialize-instance :around ((class standard-description-class) &rest initargs &key (direct-superclasses '() direct-superclasses-p)) |
170 | (declare (dynamic-extent initargs)) |
171 | ; (warn "CLASS ~A ARGS ~A:" class initargs) |
172 | (prog1 |
173 | (if (or (not direct-superclasses-p) |
174 | (loop for direct-superclass in direct-superclasses |
175 | thereis (ignore-errors (subtypep direct-superclass 'standard-description-object)))) |
176 | (call-next-method) |
177 | (apply #'call-next-method |
178 | class |
179 | :direct-superclasses |
180 | (append direct-superclasses |
181 | (list (find-class 'standard-description-object))) |
182 | initargs)) |
183 | (initialize-description-class class))) |
184 | |
185 | |
186 | (defmethod print-object ((object standard-description-object) stream) |
187 | (print-unreadable-object (object stream :type nil :identity t) |
188 | (format stream "DESCRIPTION ~A" (ignore-errors (description-print-name object))))) |
189 | |
190 | (defmethod print-object ((object standard-description-class) stream) |
191 | (print-unreadable-object (object stream :type t :identity t) |
192 | (princ (ignore-errors (description-print-name (find-layer object))) stream))) |
193 | |
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194 | (defun find-description (name &optional (errorp t)) |
195 | (let ((class (find-class (defining-description name) errorp))) |
196 | (when class (find-layer class)))) |
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197 | |
198 | |
199 | |
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200 | |
201 | |
202 | |