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