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fdeed55d DC |
1 | (in-package :lisp-on-lines) |
2 | ||
2b0fd9c8 | 3 | (define-layered-function display-using-description (description object component) |
f9b11956 | 4 | (:method-combination wrapping-standard) |
2b0fd9c8 DC |
5 | (:documentation |
6 | "Render the object in component, | |
7 | using DESCRIPTION, which is an occurence, an attribute, or something else entirely.")) | |
fdeed55d | 8 | |
fb04c0a8 | 9 | (defun make-display-function (component object |
10 | &rest properties | |
1d51a2ee | 11 | &key (line #'line-in) |
fb04c0a8 | 12 | &allow-other-keys) |
13 | "returns a function that expects a 3 argument function as its argument | |
14 | ||
1d51a2ee | 15 | 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." |
fb04c0a8 | 16 | |
17 | (lambda (function) | |
18 | (let* ((description (find-occurence object))) | |
fb04c0a8 | 19 | (if description |
1d51a2ee | 20 | (dletf (((attributes description) |
21 | (or | |
22 | (attributes description) | |
23 | (list-attributes description)))) | |
fb04c0a8 | 24 | ;; apply the default line to the description |
25 | (funcall-with-description | |
26 | description | |
27 | (funcall line object) | |
28 | ;; apply the passed in arguments and call display-using-description | |
29 | #'(lambda () | |
30 | (funcall-with-description | |
31 | description | |
32 | properties | |
33 | function description object component)))) | |
34 | (error "no description for ~A" object))))) | |
2b0fd9c8 DC |
35 | |
36 | (define-layered-function display (component object &rest args) | |
37 | (:documentation | |
38 | "Displays OBJECT in COMPONENT.")) | |
39 | ||
40 | (define-layered-method display ((component t) (object t) | |
1cc831d4 | 41 | &rest properties) |
0386c736 | 42 | " The default display dispatch method |
43 | ||
44 | DISPLAY takes two required arguments, | |
45 | COMPONENT : The component to display FROM (not neccesarily 'in') | |
46 | OBJECT : The 'thing' we want to display... in this case it's the component | |
47 | ||
48 | DISPLAY also takes keywords arguments which modify the DESCRIPTION, | |
49 | that is to say the parameters that come together to create the output. | |
50 | ||
51 | The default display calls out via FUNCALL-WITH-LAYERS to tche DISPLAY-USING-DESCRIPTION method." | |
1cc831d4 | 52 | (funcall (apply 'make-display-function component object properties) |
53 | 'display-using-description)) | |
fdeed55d DC |
54 | |
55 | ;;;;; Macros | |
a4e6154d | 56 | |
1d51a2ee | 57 | (defun funcall-with-layers (layers thunk) |
58 | (let ((context (current-layer-context))) | |
59 | (loop :for (op layer) | |
60 | :on layers :by #'cddr | |
61 | :do (setf context | |
62 | (case op | |
63 | (+ (adjoin-layer layer context)) | |
64 | (- (remove-layer layer context))))) | |
65 | (funcall-with-layer-context context thunk))) | |
66 | ||
67 | ||
68 | (defun funcall-with-description (description properties function &rest args) | |
2b0fd9c8 | 69 | (if description |
1d51a2ee | 70 | (dletf* (((description-type description) |
71 | (or | |
72 | (getf properties :type) | |
73 | (description-type description))) | |
2b0fd9c8 | 74 | |
1d51a2ee | 75 | ((description-layers description) |
76 | (append | |
77 | (description-layers description) | |
78 | (getf properties :layers))) | |
1cc831d4 | 79 | ((description-properties description) (append (description-properties description) properties))) |
2b0fd9c8 | 80 | (funcall-with-layers |
1cc831d4 | 81 | (description-layers description) |
1d51a2ee | 82 | (lambda () |
83 | (contextl::funcall-with-special-initargs | |
84 | (list (cons description properties)) | |
85 | #'(lambda () | |
86 | (apply function args)))))) | |
2b0fd9c8 DC |
87 | (apply function args))) |
88 | ||
2b0fd9c8 DC |
89 | (defmacro with-description ((description &rest properties) &body body) |
90 | `(funcall-with-description ,description (if ',(cdr properties) | |
91 | (list ,@properties) | |
92 | ,(car properties)) | |
93 | #'(lambda () | |
94 | ,@body))) | |
95 | ||
f9b11956 | 96 | (define-layered-function find-do-attributes (desc)) |
97 | ||
98 | (define-layered-method find-do-attributes ((description description)) | |
99 | ||
100 | (loop | |
101 | :for att | |
102 | :in (attributes description) | |
103 | :collect (let ((default (find (car (ensure-list att)) | |
104 | (default-attributes description) | |
105 | :key #'car))) | |
106 | (or default att)))) | |
107 | ||
108 | (defmacro do-attributes ((var description &optional (attributes `(find-do-attributes ,description))) &body body) | |
fdeed55d | 109 | (with-unique-names (att properties type) |
2b0fd9c8 | 110 | `(dolist* (,att ,attributes) |
f9b11956 | 111 | (let* ((,att (ensure-list ,att)) |
112 | (,properties (rest ,att)) | |
113 | (,type (getf ,properties :type)) | |
114 | (,var (let ((a (find-attribute ,description (first ,att)))) | |
115 | (if ,type | |
116 | (apply #'make-attribute :name (first ,att) :type ,type ,properties) | |
117 | (if a a (make-attribute :name (first ,att) :slot-name (first ,att))))))) | |
118 | (funcall-with-description ,var ,properties | |
119 | #'(lambda () | |
120 | ,@body)))))) | |
2b0fd9c8 DC |
121 | |
122 | (defmacro with-component ((component) &body body) | |
123 | `(let ((self ,component)) | |
124 | (declare (ignorable self)) | |
125 | (flet ((display* (thing &rest args) | |
126 | (apply #'display ,component thing args)) | |
1cc831d4 | 127 | (display-attribute (attribute obj &rest |
128 | props) | |
2b0fd9c8 DC |
129 | (if props |
130 | (funcall-with-description | |
131 | attribute props | |
132 | #'display-using-description attribute obj ,component) | |
133 | (display-using-description attribute obj ,component)))) | |
134 | (declare (ignorable #'display* #'display-attribute)) | |
135 | ,@body))) | |
136 | ||
1d51a2ee | 137 | |
2b0fd9c8 DC |
138 | |
139 |