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Revision 8 - (show annotations)
Sun Dec 9 09:12:39 2012 UTC (16 months, 1 week ago) by rklochkov
File size: 14601 byte(s)
Fixed assoc check in handler
1 (in-package #:advanced-readtable)
2
3 ;;; Advanced-readtable
4 ;;;
5 ;;; per-package aliases for packages
6 ;;; per-package shortcuts for package hierarchies
7 ;;; extendable find-package and find-symbol
8 ;;; local use pcakage in form package:(here form where package used)
9 ;;; local intern package like in SBCL: package::(symbol1 symbol2) will intern
10 ;;; package::symbol1 and package::symbol2
11
12 (defvar *per-package-finders* (make-hash-table :test 'eq)
13 "Hash package -> list of handlers. Each handler is a cons (key . function)")
14 (defvar *package-finders* nil
15 "List of handlers. Each handler is a cons (key . function)
16 function = (lambda (name package) ...) -> package")
17
18
19
20
21 ;;;
22 ;;; Prepare readtables
23 ;;;
24
25
26
27 (defvar *advanced-readtable* (copy-readtable nil))
28 (defvar *colon-readtable* (copy-readtable nil)
29 "Support readtable with colon as whitespace")
30
31 ;;;
32 ;;; Readtable handlers
33 ;;;
34
35 (defpackage #:advanced-readtable.junk)
36
37
38
39 (defun try-funcall (handlers-list name package)
40 (declare (type list handlers-list)
41 (type string name)
42 (type (or null package) package))
43 (when handlers-list
44 (or (funcall (cdr (car handlers-list)) name package)
45 (try-funcall (cdr handlers-list) name package))))
46
47 (defun find-package (name &optional (current-package *package*))
48 "We try to find package.
49 1. By full name with CL:FIND-PACKAGE.
50 2. By per-package handlers. Here we wil try local-nicknames and so on.
51 3. By global handlers. Here we may use, for example, hierarchical packages."
52 (declare (type (or null package) current-package))
53 (if (typep name 'package) name
54 (let ((sname (string name)))
55 (or
56 (cl:find-package name)
57 (when current-package
58 (try-funcall (package-finders current-package) sname current-package))
59 (try-funcall *package-finders* sname current-package)))))
60
61 (defvar *package-symbol-finders* (make-hash-table :test 'eq)
62 "Hash package -> list of handlers. Each handler is a cons (key . function)")
63 (defvar *symbol-finders* nil
64 "List of handlers. Each handler is a cons (key . function)
65 function = (lambda (name package) ...) -> symbol")
66 (defvar *extra-finders* (make-hash-table :test 'eq)
67 "Hash symbol -> list of handlers. Each handler is a cons (key . function)
68 function = (lambda (name package) ...) -> symbol
69 These will be used before CL:FIND-SYMBOL")
70
71 (defvar *symbol-readmacros* (make-hash-table :test 'eq))
72 (defvar *disable-symbol-readmacro* nil
73 "Disables processing of symbol-readmacro.")
74
75 (defun def-symbol-readmacro (symbol func)
76 (setf (gethash symbol *symbol-readmacros*) func))
77
78 (defun set-macro-symbol (symbol func)
79 "Syntax is like set-macro-character,
80 except that FUNC is binded to SYMBOL, not character"
81 (setf (gethash symbol *symbol-readmacros*) func))
82
83 (defun get-macro-symbol (symbol)
84 "Syntax is like get-macro-character.
85 Returns function, assigned by set-macro-symbol"
86 (gethash symbol *symbol-readmacros*))
87
88 (defun process-symbol-readmacro (symbol stream)
89 (let ((func (gethash symbol *symbol-readmacros*)))
90 (if func (funcall func stream symbol) symbol)))
91
92 ;;; Internal special variables. Do not export
93
94 (defvar *extra-symbol-finders* nil
95 "List of handlers: handlers for symbol, car of list")
96 (defvar *car-list* nil "Boolean: iff reader in list and car is not read")
97 (defvar *local-packages* nil "List of packages: for pack:( ... pack2:(...))")
98
99 (defun try-local-packages (packages name)
100 (when packages
101 (multiple-value-bind (symbol status) (cl:find-symbol name (car packages))
102 (if symbol
103 (values symbol status)
104 (try-local-packages (cdr packages) name)))))
105
106 (defun try-mv-funcall (handlers-list name package)
107 "Returns symbol, status"
108 (declare (type list handlers-list)
109 (type string name)
110 (type (or null package) package))
111 (when handlers-list
112 (multiple-value-bind (symbol status)
113 (funcall (cdr (car handlers-list)) name package)
114 (if symbol
115 (values symbol status)
116 (try-funcall (cdr handlers-list) name package)))))
117
118
119 (defun find-symbol (name &optional dpackage)
120 "We try to find symbol
121 1. In package set with car of list, for example, PUSh-LOCAL-PACKAGE
122 2. By CL-FIND-SYMBOL
123 3. By packages added with package:(...)
124 4. By per-package finders
125 5. By global finders"
126 (declare (type string name))
127 (let ((package (if dpackage (find-package dpackage) *package*)))
128 (macrolet ((mv-or (&rest clauses)
129 (if clauses
130 `(multiple-value-bind (symbol status) ,(car clauses)
131 (if symbol (values symbol status)
132 (mv-or . ,(cdr clauses))))
133 `(values nil nil))))
134
135 (mv-or
136 (try-mv-funcall *extra-symbol-finders* name package)
137 (cl:find-symbol name package)
138 (unless dpackage (try-local-packages *local-packages* name))
139 (try-mv-funcall (symbol-finders package) name package)
140 (try-mv-funcall *symbol-finders* name package)))))
141
142 (defun read-token (stream)
143 "
144 DO: Reads from STREAM a symbol or number up to whitespace or colon
145 RETURN: symbols name or numbers value"
146 (let ((*readtable* *colon-readtable*)
147 (*package* (cl:find-package '#:advanced-readtable.junk)))
148 (read-preserving-whitespace stream nil)))
149
150 (defun count-colons (stream)
151 "
152 DO: Reads colons from STREAM
153 RETURN: number of the colons"
154 (let ((c (read-char stream nil)))
155 (if (eql c #\:)
156 (+ 1 (count-colons stream))
157 (progn (unread-char c stream) 0))))
158
159 (defun read-after-colon (stream maybe-package colons)
160 "Read symbol package:sym or list package:(...)"
161 (when (= colons 0)
162 (return-from read-after-colon
163 (if (symbolp maybe-package)
164 (let ((name (symbol-name maybe-package)))
165 (or (find-symbol name) (intern name)))
166 maybe-package)))
167
168 (let ((package (find-package maybe-package)))
169 (assert package (package) "No package ~a" maybe-package)
170 (unintern maybe-package)
171 (when (eql (peek-char t stream) #\()
172 ;; package:(...) or package::(...)
173 (ecase colons
174 (1 (let ((*local-packages* (cons package *local-packages*)))
175 (return-from read-after-colon
176 (read stream nil))))
177 (2 (let ((*package* package))
178 (return-from read-after-colon
179 (read stream nil))))))
180
181 (let ((token (read-token stream)))
182 (check-type token symbol)
183 (multiple-value-bind (symbol status)
184 (find-symbol (symbol-name token) package)
185 (unintern token)
186 (when (and (= colons 1) (not (eq status :external)))
187 (cerror "Use anyway"
188 "Symbol ~A not external" symbol))
189 symbol))))
190
191
192
193 (defun read-token-with-colons (stream char)
194 "Reads token, then analize package part if needed"
195 (unread-char char stream)
196 (when *read-suppress*
197 (let ((*readtable* (copy-readtable nil)))
198 (read stream))
199 (return-from read-token-with-colons))
200 (let* ((token (read-token stream))
201 ;; We have read something.
202 ;; It may represent either symbol or package designator.
203 ;; Looking after it: do we have a colon?
204 (colons (count-colons stream))
205 (object (read-after-colon stream token colons)))
206
207 (when (or *disable-symbol-readmacro*
208 (not (symbolp object))
209 (eql char #\|))
210 (return-from read-token-with-colons object))
211
212 (let ((object (process-symbol-readmacro object stream)))
213 (when *car-list*
214 (setf *car-list* nil
215 *extra-symbol-finders*
216 (append (extra-finders object) *extra-symbol-finders*)))
217 object)))
218
219 (let ((default-open-paren-reader
220 (get-macro-character #\( (copy-readtable nil))))
221 (defun open-paren-reader (stream char)
222 (let ((*car-list* t) (*extra-symbol-finders* *extra-symbol-finders*))
223 (funcall default-open-paren-reader stream char))))
224
225
226
227 (defun (setf package-finders) (value &optional (package *package*))
228 (setf (gethash (find-package package) *per-package-finders*) value))
229
230 (defun package-finders (&optional (package *package*))
231 (gethash (find-package package) *per-package-finders*))
232
233 (defun (setf symbol-finders) (value &optional (package *package*))
234 (setf (gethash (find-package package) *package-symbol-finders*) value))
235
236 (defun symbol-finders (&optional (package *package*))
237 (gethash (find-package package) *package-symbol-finders*))
238
239 (defun (setf extra-finders) (value symbol)
240 (setf (gethash symbol *extra-finders*) value))
241
242 (defun extra-finders (symbol)
243 (gethash symbol *extra-finders*))
244
245 (defmacro set-handler (handler-list key function)
246 (let ((key-var (gensym "key")))
247 `(let ((,key-var ,key))
248 (unless (assoc ,key-var ,handler-list :test #'equal)
249 (push (cons ,key-var ,function)
250 ,handler-list)))))
251
252 (defmacro %set-handler (handler-list key name &body handler-body)
253 "Local macros for push-* functions. No gensyms intended."
254 `(set-handler ,handler-list ,key
255 (lambda (,name package)
256 (declare (ignore package)) . ,handler-body)))
257
258 (defun push-import-prefix (prefix &optional (package *package*))
259 "Enables using package name omitting prefix.
260 For example, you have packages com.clearly-useful.iterator-protocol, com.clearly-useful.reducers, ...
261 You may use them as
262 (push-import-prefix :com.clearly-useful)
263 (iterator-protocol:do-iterator ...)
264 (reducers:r/map #'1+ data)
265 and so on.
266 Package prefix is enabled per package so it is safe to use it in your package.
267
268 If there is package, which name coincides with shortcut, package name has priority.
269
270 So, if you make
271 (defpackage :reducers ...)
272
273 after that reducers:... will refer to new package, not com.clearly-useful.reducers.
274 "
275 (%set-handler (package-finders package) `(:prefix ,prefix) name
276 (cl:find-package (concatenate 'string prefix "." name))))
277
278 (defun push-local-nickname (long-package nick
279 &optional (current-package *package*))
280 "Enables package nickname in CURRENT-PACKAGE.
281 For example, you found COM.INFORMATIMAGO.COMMON-LISP.CESARUM.LIST package and want to use
282 it. But don't want to USE-PACKAGE them, because some exported symbols from it are clashing
283 with yours.
284
285 You may do it right:
286 (push-local-nickname :com.informatimago.common-lisp.cesarum.list :ilist)
287 (ilist:circular-length l)
288
289 Local-nicknames are local, so you may use it freely.
290
291 Local-nickname shadows any package, which name is NICK, so if package A wants
292 package LIB version 1, and package B wants package LIB version 2, one can simply
293 rename LIB version 1 to LIB1 and make
294 (push-local-nickname :lib1 :lib :a)
295 "
296 (let ((dpackage (find-package long-package)))
297 (%set-handler (package-finders current-package) `(:nick ,long-package ,nick) name
298 (when (string= name (string nick)) dpackage))))
299
300 (defun push-local-package (symbol local-package)
301 "Sets local-package for a symbol. Many macroses use there own clauses.
302 For example, ITERATE uses FOR, COLLECT and so on.
303 If you don't want to USE-PACKAGE iterate, this function will help.
304 (push-local-package 'iter:iter :iterate)
305 (iter:iter (for i from 1 to 10) (collect i))
306
307 Caution: this function enables package substitution in all cases,
308 where SYMBOL is the car of a list.
309 For example, this will be error:
310 (let (iter:iter for) (list iter:iter for))
311 , because first for is in ITERATE package, but second -- is not.
312 "
313 (let ((dpackage (find-package local-package)))
314 (%set-handler (extra-finders symbol) `(:local ,symbol ,local-package) name
315 (multiple-value-bind (symbol status) (cl:find-symbol name dpackage)
316 (when (eq status :external) symbol)))))
317
318 ;;;
319 ;;; Readtable analysis and change
320 ;;;
321
322 (defmacro with-case (case &body body)
323 (let ((save (gensym)))
324 `(let ((,save (readtable-case *readtable*)))
325 (setf (readtable-case *readtable*) ,case)
326 (unwind-protect
327 (progn ,@body)
328 (setf (readtable-case *readtable*) ,save)))))
329
330 (defun does-not-terminate-token-p (c)
331 (ignore-errors
332 (let ((str (format nil "a~Ab" c)))
333 (string= str (symbol-name
334 (with-case :preserve
335 (read-from-string (format nil "#:~A" str))))))))
336
337
338 (defun whitespace-p (c)
339 (ignore-errors
340 (= 2 (length (read-from-string (format nil "(#:a~A#:b)" c))))))
341
342 (defun multiple-escape-p (c)
343 (ignore-errors
344 (string= "qQ" (symbol-name
345 (with-case :upcase
346 (read-from-string (format nil "#:~AqQ~A" c c)))))))
347
348 (defun single-escape-p (c)
349 (ignore-errors
350 (string= (symbol-name '#:\ ) (symbol-name
351 (read-from-string (format nil "#:~A'" c))))))
352
353
354
355 (defun macro-char-p (c)
356 "If C is macro-char, return GET-MACRO-CHARACTER"
357 #+allegro (unless
358 (eql (get-macro-character c) #'excl::read-token)
359 (get-macro-character c))
360 #-allegro (get-macro-character c))
361
362 (defun fill-char-table ()
363 "Returns simple-vector with character syntax classes"
364 (let ((*readtable* (copy-readtable nil))
365 (char-table (make-array 127)))
366 (dotimes (i (length char-table))
367 (let ((c (code-char i)))
368 (setf
369 (svref char-table i)
370 (cond
371 ((eql c #\:) :colon)
372 ((macro-char-p c) :macro)
373 ((does-not-terminate-token-p c) :does-not-terminate-token)
374 ((whitespace-p c) :whitespace)
375 ((multiple-escape-p c) :multiple-escape)
376 ((single-escape-p c) :single-escape)))))
377 char-table))
378
379 (let (initialized)
380 (defun activate (&optional force)
381 "Inits *advanced-readtable* and *colon-readtable*."
382 (when (or force (not initialized))
383 (setq initialized t)
384 (let ((char-table (fill-char-table)))
385 (dotimes (i (length char-table))
386 (let ((b (svref char-table i))
387 (c (code-char i)))
388 (unless (char= #\# c)
389 (when (member b '(:does-not-terminate-token
390 :multiple-escape :single-escape))
391 ;; will make it non-terminating macro character
392 ;; = potentially beginning of the package-name
393 (set-macro-character c #'read-token-with-colons
394 t *advanced-readtable*))))))
395
396 (set-syntax-from-char #\: #\Space *colon-readtable* *colon-readtable*)
397 (set-macro-character #\( #'open-paren-reader))
398 (setf *readtable* *advanced-readtable*)))
399
400 (defun ! () (activate))

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