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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 | |
36 | (defclass description-access-class (standard-layer-class contextl::special-layered-access-class ) |
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) |
53 | (setf (attribute-object attribute) |
54 | (make-instance 'standard-attribute |
55 | :name name |
56 | 'effective-attribute attribute |
57 | 'description-class class)) |
58 | attribute)) |
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59 | |
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60 | |
61 | (defclass standard-description-class (description-access-class layered-class) |
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62 | () |
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63 | (:default-initargs :defining-metaclass 'description-access-class)) |
64 | |
65 | (defmethod validate-superclass |
66 | ((class standard-description-class) |
67 | (superclass standard-class)) |
68 | t) |
69 | |
70 | (defclass standard-description-object (standard-layer-object) ()) |
71 | |
72 | (defun description-class-name (description-class) |
73 | (read-from-string (symbol-name (class-name description-class)))) |
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74 | |
75 | (defun initialize-description-class (class) |
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76 | |
77 | ;;; HACK: initialization does not happen properly |
78 | ;;; when compiling and loading or something like that. |
79 | ;;; Obviously i'm not sure why. |
80 | ;;; So we're going to explicitly initialize things. |
81 | ;;; For now. --drewc |
82 | |
83 | (pushnew class *defined-descriptions*) |
84 | |
85 | ;;; ENDHACK. |
86 | |
87 | (let* ((description (find-layer class)) |
88 | (attribute-objects (mapcar #'attribute-object (class-slots (class-of description)))) |
89 | (defining-classes (partial-class-defining-classes (class-of description)))) |
90 | |
91 | |
92 | |
93 | (loop |
94 | :for (layer class) |
95 | :on defining-classes :by #'cddr |
96 | :do (funcall-with-layer-context |
97 | (adjoin-layer (find-layer layer) (current-layer-context)) |
98 | (lambda () |
99 | (loop :for direct-slot :in (class-direct-slots class) |
100 | :do (let ((attribute |
101 | (find (slot-definition-name direct-slot) |
102 | attribute-objects |
103 | :key #'attribute-name))) |
104 | (apply #'reinitialize-instance attribute |
105 | (direct-attribute-properties direct-slot)) |
106 | (apply #'change-class attribute (attribute-class attribute) (direct-attribute-properties direct-slot)) |
107 | |
108 | (setf (slot-value description (attribute-name attribute)) |
109 | attribute)))))))) |
110 | |
111 | ;;;; HACK: run this at startup till we figure things out. |
112 | (defun initialize-descriptions () |
113 | (map nil #'initialize-description-class |
114 | (setf *defined-descriptions* |
115 | (remove-duplicates *defined-descriptions*)))) |
116 | |
117 | (defmethod initialize-instance :around ((class standard-description-class) &rest initargs &key (direct-superclasses '())) |
118 | (declare (dynamic-extent initargs)) |
119 | (prog1 |
120 | (if (loop for direct-superclass in direct-superclasses |
121 | thereis (ignore-errors (subtypep direct-superclass 'standard-description-object))) |
122 | (call-next-method) |
123 | (apply #'call-next-method |
124 | class |
125 | :direct-superclasses |
126 | (append direct-superclasses |
127 | (list (find-class 'standard-description-object))) |
128 | initargs)) |
129 | (initialize-description-class class))) |
130 | |
131 | |
132 | (defmethod reinitialize-instance :around ((class standard-description-class) &rest initargs &key (direct-superclasses '() direct-superclasses-p)) |
133 | (declare (dynamic-extent initargs)) |
134 | ; (warn "CLASS ~A ARGS ~A:" class initargs) |
135 | (prog1 |
136 | (if (or (not direct-superclasses-p) |
137 | (loop for direct-superclass in direct-superclasses |
138 | thereis (ignore-errors (subtypep direct-superclass 'standard-description-object)))) |
139 | (call-next-method) |
140 | (apply #'call-next-method |
141 | class |
142 | :direct-superclasses |
143 | (append direct-superclasses |
144 | (list (find-class 'standard-description-object))) |
145 | initargs)) |
146 | (initialize-description-class class))) |
147 | |
148 | |
149 | (defmethod print-object ((object standard-description-object) stream) |
150 | (print-unreadable-object (object stream :type nil :identity t) |
151 | (format stream "DESCRIPTION ~A" (ignore-errors (description-print-name object))))) |
152 | |
153 | (defmethod print-object ((object standard-description-class) stream) |
154 | (print-unreadable-object (object stream :type t :identity t) |
155 | (princ (ignore-errors (description-print-name (find-layer object))) stream))) |
156 | |
157 | (defun find-description (name) |
158 | (find-layer (find-class (defining-description name)))) |
159 | |
160 | |
161 | |
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162 | |
163 | |
164 | |