1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
|
;;; eieio-compat.el --- Compatibility with Older EIEIO versions -*- lexical-binding:t -*-
;; Copyright (C) 1995-1996, 1998-2016 Free Software Foundation, Inc.
;; Author: Eric M. Ludlam <zappo@gnu.org>
;; Keywords: OO, lisp
;; Package: eieio
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; Backward compatibility definition of old EIEIO functions in
;; terms of newer equivalent.
;; The main elements are the old EIEIO `defmethod' and `defgeneric' which are
;; now implemented on top of cl-generic. The differences we have to
;; accommodate are:
;; - EIEIO's :static methods (turned into a new `eieio--static' specializer).
;; - EIEIO's support for `call-next-method' and `next-method-p' instead of
;; `cl-next-method-p' and `cl-call-next-method' (simple matter of renaming).
;; - Different errors are signaled.
;; - EIEIO's defgeneric does not reset the function.
;; - EIEIO's no-next-method and no-applicable-method can't be aliases of
;; cl-generic's namesakes since they have different calling conventions,
;; which means that packages that (defmethod no-next-method ..) don't work.
;; - EIEIO's `call-next-method' and `next-method-p' had dynamic scope whereas
;; cl-generic's `cl-next-method-p' and `cl-call-next-method' are lexically
;; scoped.
;;; Code:
(require 'eieio-core)
(require 'cl-generic)
(put 'eieio--defalias 'byte-hunk-handler
#'byte-compile-file-form-defalias) ;;(get 'defalias 'byte-hunk-handler)
;;;###autoload
(defun eieio--defalias (name body)
"Like `defalias', but with less side-effects.
More specifically, it has no side-effects at all when the new function
definition is the same (`eq') as the old one."
(cl-assert (not (symbolp body)))
(while (and (fboundp name) (symbolp (symbol-function name)))
;; Follow aliases, so methods applied to obsolete aliases still work.
(setq name (symbol-function name)))
(unless (and (fboundp name)
(eq (symbol-function name) body))
(defalias name body)))
;;;###autoload
(defmacro defgeneric (method args &optional doc-string)
"Create a generic function METHOD.
DOC-STRING is the base documentation for this class. A generic
function has no body, as its purpose is to decide which method body
is appropriate to use. Uses `defmethod' to create methods, and calls
`defgeneric' for you. With this implementation the ARGS are
currently ignored. You can use `defgeneric' to apply specialized
top level documentation to a method."
(declare (doc-string 3) (obsolete cl-defgeneric "25.1"))
`(eieio--defalias ',method
(eieio--defgeneric-init-form
',method
,(if doc-string (help-add-fundoc-usage doc-string args)))))
;;;###autoload
(defmacro defmethod (method &rest args)
"Create a new METHOD through `defgeneric' with ARGS.
The optional second argument KEY is a specifier that
modifies how the method is called, including:
:before - Method will be called before the :primary
:primary - The default if not specified
:after - Method will be called after the :primary
:static - First arg could be an object or class
The next argument is the ARGLIST. The ARGLIST specifies the arguments
to the method as with `defun'. The first argument can have a type
specifier, such as:
((VARNAME CLASS) ARG2 ...)
where VARNAME is the name of the local variable for the method being
created. The CLASS is a class symbol for a class made with `defclass'.
A DOCSTRING comes after the ARGLIST, and is optional.
All the rest of the args are the BODY of the method. A method will
return the value of the last form in the BODY.
Summary:
(defmethod mymethod [:before | :primary | :after | :static]
((typearg class-name) arg2 &optional opt &rest rest)
\"doc-string\"
body)"
(declare (doc-string 3) (obsolete cl-defmethod "25.1")
(debug
(&define ; this means we are defining something
[&or name ("setf" :name setf name)]
;; ^^ This is the methods symbol
[ &optional symbolp ] ; this is key :before etc
list ; arguments
[ &optional stringp ] ; documentation string
def-body ; part to be debugged
)))
(let* ((key (if (keywordp (car args)) (pop args)))
(params (car args))
(arg1 (car params))
(fargs (if (consp arg1)
(cons (car arg1) (cdr params))
params))
(class (if (consp arg1) (nth 1 arg1)))
(code `(lambda ,fargs ,@(cdr args))))
`(progn
;; Make sure there is a generic and the byte-compiler sees it.
(defgeneric ,method ,args)
(eieio--defmethod ',method ',key ',class #',code))))
(defun eieio--generic-static-symbol-specializers (tag &rest _)
(cl-assert (or (null tag) (eieio--class-p tag)))
(when (eieio--class-p tag)
(let ((superclasses (eieio--generic-subclass-specializers tag))
(specializers ()))
(dolist (superclass superclasses)
(push superclass specializers)
(push `(eieio--static ,(cadr superclass)) specializers))
(nreverse specializers))))
(cl-generic-define-generalizer eieio--generic-static-symbol-generalizer
;; Give it a slightly higher priority than `subclass' so that the
;; interleaved list comes before subclass's non-interleaved list.
61 (lambda (name &rest _) `(and (symbolp ,name) (cl--find-class ,name)))
#'eieio--generic-static-symbol-specializers)
(cl-generic-define-generalizer eieio--generic-static-object-generalizer
;; Give it a slightly higher priority than `class' so that the
;; interleaved list comes before the class's non-interleaved list.
51 #'cl--generic-struct-tag
(lambda (tag &rest _)
(and (symbolp tag) (boundp tag) (setq tag (symbol-value tag))
(eieio--class-p tag)
(let ((superclasses (eieio--class-precedence-list tag))
(specializers ()))
(dolist (superclass superclasses)
(setq superclass (eieio--class-name superclass))
(push superclass specializers)
(push `(eieio--static ,superclass) specializers))
(nreverse specializers)))))
(cl-defmethod cl-generic-generalizers ((_specializer (head eieio--static)))
(list eieio--generic-static-symbol-generalizer
eieio--generic-static-object-generalizer))
;;;###autoload
(defun eieio--defgeneric-init-form (method doc-string)
(if doc-string (put method 'function-documentation doc-string))
(if (memq method '(no-next-method no-applicable-method))
(symbol-function method)
(let ((generic (cl-generic-ensure-function method)))
(symbol-function (cl--generic-name generic)))))
;;;###autoload
(defun eieio--defmethod (method kind argclass code)
(setq kind (intern (downcase (symbol-name kind))))
(let* ((specializer (if (not (eq kind :static))
(or argclass t)
(setq kind nil)
`(eieio--static ,argclass)))
(uses-cnm (not (memq kind '(:before :after))))
(specializers `((arg ,specializer)))
(code
;; Backward compatibility for `no-next-method' and
;; `no-applicable-method', which have slightly different calling
;; convention than their cl-generic counterpart.
(pcase method
(`no-next-method
(setq method 'cl-no-next-method)
(setq specializers `(generic method ,@specializers))
(lambda (_generic _method &rest args) (apply code args)))
(`no-applicable-method
(setq method 'cl-no-applicable-method)
(setq specializers `(generic ,@specializers))
(lambda (generic arg &rest args)
(apply code arg (cl--generic-name generic) (cons arg args))))
(_ code))))
(cl-generic-define-method
method (unless (memq kind '(nil :primary)) (list kind))
specializers uses-cnm
(if uses-cnm
(let* ((docstring (documentation code 'raw))
(args (help-function-arglist code 'preserve-names))
(doc-only (if docstring
(let ((split (help-split-fundoc docstring nil)))
(if split (cdr split) docstring)))))
(lambda (cnm &rest args)
(:documentation
(help-add-fundoc-usage doc-only (cons 'cl-cnm args)))
(cl-letf (((symbol-function 'call-next-method) cnm)
((symbol-function 'next-method-p)
(lambda () (cl--generic-isnot-nnm-p cnm))))
(apply code args))))
code))
;; The old EIEIO code did not signal an error when there are methods
;; applicable but only of the before/after kind. So if we add a :before
;; or :after, make sure there's a matching dummy primary.
(when (and (memq kind '(:before :after))
;; FIXME: Use `cl-find-method'?
(not (cl-find-method method ()
(mapcar (lambda (arg)
(if (consp arg) (nth 1 arg) t))
specializers))))
(cl-generic-define-method method () specializers t
(lambda (cnm &rest args)
(if (cl--generic-isnot-nnm-p cnm)
(apply cnm args)))))
method))
;; Compatibility with code which tries to catch `no-method-definition' errors.
(push 'no-method-definition (get 'cl-no-applicable-method 'error-conditions))
(defun generic-p (fname) (not (null (cl--generic fname))))
(defun no-next-method (&rest args)
(declare (obsolete cl-no-next-method "25.1"))
(apply #'cl-no-next-method 'unknown nil args))
(defun no-applicable-method (object method &rest args)
(declare (obsolete cl-no-applicable-method "25.1"))
(apply #'cl-no-applicable-method method object args))
(define-obsolete-function-alias 'call-next-method 'cl-call-next-method "25.1")
(defun next-method-p ()
(declare (obsolete cl-next-method-p "25.1"))
;; EIEIO's `next-method-p' just returned nil when called in an
;; invalid context.
(message "next-method-p called outside of a primary or around method")
nil)
;;;###autoload
(defun eieio-defmethod (method args)
"Obsolete work part of an old version of the `defmethod' macro."
(declare (obsolete cl-defmethod "24.1"))
(eval `(defmethod ,method ,@args))
method)
;;;###autoload
(defun eieio-defgeneric (method doc-string)
"Obsolete work part of an old version of the `defgeneric' macro."
(declare (obsolete cl-defgeneric "24.1"))
(eval `(defgeneric ,method (x) ,@(if doc-string `(,doc-string))))
;; Return the method
'method)
;;;###autoload
(defun eieio-defclass (cname superclasses slots options)
(declare (obsolete eieio-defclass-internal "25.1"))
(eval `(defclass ,cname ,superclasses ,slots ,@options)))
;; Local Variables:
;; generated-autoload-file: "eieio-core.el"
;; End:
(provide 'eieio-compat)
;;; eieio-compat.el ends here
|
