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Revision 1.44 - (hide annotations)
Sun Mar 11 22:02:24 2001 UTC (13 years, 1 month ago) by pw
Branch: MAIN
Changes since 1.43: +19 -73 lines
Add Mike McDonald's revised changes to permit autoloading logical
pathname translations.
1 wlott 1.1 ;;; -*- Package: LISP -*-
2     ;;; **********************************************************************
3     ;;; This code was written as part of the CMU Common Lisp project at
4     ;;; Carnegie Mellon University, and has been placed in the public domain.
5     ;;;
6     (ext:file-comment
7 pw 1.44 "$Header: /tiger/var/lib/cvsroots/cmucl/src/code/pathname.lisp,v 1.44 2001/03/11 22:02:24 pw Exp $")
8 wlott 1.1 ;;;
9     ;;; **********************************************************************
10     ;;;
11     ;;; Machine/filesystem independent pathname functions for CMU Common Lisp.
12     ;;;
13 ram 1.17 ;;; Written by William Lott, Paul Gleichauf and Rob MacLachlan.
14 wlott 1.1 ;;; Earlier version written by Jim Large and Rob MacLachlan
15     ;;;
16     ;;; **********************************************************************
17    
18     (in-package "LISP")
19    
20     (export '(pathname pathnamep logical-pathname logical-pathname-p
21     parse-namestring merge-pathnames make-pathname
22     pathname-host pathname-device pathname-directory pathname-name
23     pathname-type pathname-version namestring file-namestring
24     directory-namestring host-namestring enough-namestring
25     wild-pathname-p pathname-match-p translate-pathname
26     translate-logical-pathname logical-pathname-translations
27     load-logical-pathname-translations *default-pathname-defaults*))
28    
29     (in-package "EXTENSIONS")
30 wlott 1.9 (export '(search-list search-list-defined-p clear-search-list
31 pw 1.44 enumerate-search-list *autoload-translations*))
32 wlott 1.1
33     (in-package "LISP")
34    
35 pw 1.44 (defvar *autoload-translations* nil
36     "When non-nil, attempt to load \"library:<host>.translations\" to resolve
37     an otherwise undefined logical host.")
38    
39 wlott 1.1
40 phg 1.16 ;;;; HOST structures
41 wlott 1.1
42 phg 1.16 ;;; The host structure holds the functions that both parse the pathname
43     ;;; information into sturcture slot entries, and after translation the inverse
44     ;;; (unparse) functions.
45     ;;;
46     (defstruct (host
47     (:print-function %print-host))
48     (parse (required-argument) :type function)
49     (unparse (required-argument) :type function)
50     (unparse-host (required-argument) :type function)
51     (unparse-directory (required-argument) :type function)
52     (unparse-file (required-argument) :type function)
53     (unparse-enough (required-argument) :type function)
54     (customary-case (required-argument) :type (member :upper :lower)))
55 phg 1.13
56 phg 1.16 ;;; %PRINT-HOST -- Internal
57     ;;;
58     (defun %print-host (host stream depth)
59     (declare (ignore depth))
60     (print-unreadable-object (host stream :type t :identity t)))
61    
62     (defstruct (logical-host
63     (:include host
64     (:parse #'parse-logical-namestring)
65     (:unparse #'unparse-logical-namestring)
66 ram 1.17 (:unparse-host
67     #'(lambda (x) (logical-host-name (%pathname-host x))))
68 phg 1.16 (:unparse-directory #'unparse-logical-directory)
69 ram 1.17 (:unparse-file #'unparse-unix-file)
70 dtc 1.36 (:unparse-enough #'unparse-enough-namestring)
71 phg 1.16 (:customary-case :upper)))
72     (name "" :type simple-base-string)
73     (translations nil :type list)
74     (canon-transls nil :type list))
75    
76 ram 1.17 ;;; The various magic tokens that are allowed to appear in pretty much all
77     ;;; pathname components.
78     ;;;
79     (deftype component-tokens ()
80     '(member nil :unspecific :wild))
81    
82 phg 1.16 ;;;; Pathname structures
83    
84 wlott 1.1 (defstruct (pathname
85     (:conc-name %pathname-)
86     (:print-function %print-pathname)
87     (:constructor
88     %make-pathname (host device directory name type version))
89     (:predicate pathnamep)
90     (:make-load-form-fun :just-dump-it-normally))
91 phg 1.13 ;; Slot holds the host, at present either a UNIX or logical host.
92 wlott 1.1 (host nil :type (or host null))
93 phg 1.13 ;; Device is the name of a logical or physical device holding files.
94 dtc 1.32 (device nil :type (or simple-string component-tokens))
95 phg 1.13 ;; A list of strings that are the component subdirectory components.
96 wlott 1.1 (directory nil :type list)
97 phg 1.13 ;; The filename.
98 ram 1.17 (name nil :type (or simple-string pattern component-tokens))
99 phg 1.13 ;; The type extension of the file.
100 ram 1.17 (type nil :type (or simple-string pattern component-tokens))
101 phg 1.13 ;; The version number of the file, a positive integer, but not supported
102     ;; on standard UNIX filesystems.
103 ram 1.17 (version nil :type (or integer component-tokens (member :newest))))
104 wlott 1.1
105 phg 1.13 ;;; %PRINT-PATHNAME -- Internal
106     ;;;
107     ;;; The printed representation of the pathname structure.
108     ;;;
109 wlott 1.1 (defun %print-pathname (pathname stream depth)
110     (declare (ignore depth))
111     (let ((namestring (handler-case (namestring pathname)
112     (error nil))))
113     (cond (namestring
114 dtc 1.39 (if (or *print-escape* *print-readably*)
115     (format stream "#p~S" namestring)
116     (format stream "~A" namestring)))
117 wlott 1.1 (*print-readably*
118     (error "~S Cannot be printed readably." pathname))
119     (t
120     (funcall (formatter "#<Unprintable pathname, Host=~S, Device=~S, ~
121 pw 1.28 Directory=~S, Name=~S, Type=~S, Version=~S>")
122 wlott 1.1 stream
123     (%pathname-host pathname)
124     (%pathname-device pathname)
125     (%pathname-directory pathname)
126     (%pathname-name pathname)
127     (%pathname-type pathname)
128     (%pathname-version pathname))))))
129    
130 phg 1.16 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
131 phg 1.13 ;;;
132 phg 1.16 ;;; Logical pathnames have the following format:
133     ;;;
134     ;;; logical-namestring ::=
135     ;;; [host ":"] [";"] {directory ";"}* [name] ["." type ["." version]]
136     ;;;
137     ;;; host ::= word
138     ;;; directory ::= word | wildcard-word | **
139     ;;; name ::= word | wildcard-word
140     ;;; type ::= word | wildcard-word
141     ;;; version ::= pos-int | newest | NEWEST | *
142     ;;; word ::= {uppercase-letter | digit | -}+
143     ;;; wildcard-word ::= [word] '* {word '*}* [word]
144     ;;; pos-int ::= integer > 0
145     ;;;
146     ;;; Physical pathnames include all these slots and a device slot.
147     ;;;
148     ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
149 wlott 1.1
150 phg 1.16 ;; Logical pathnames are a subclass of pathname, their class relations are
151     ;; mimiced using structures for efficency.
152    
153     (defstruct (logical-pathname
154     (:conc-name %logical-pathname-)
155     (:print-function %print-logical-pathname)
156     (:include pathname)
157 ram 1.17 (:constructor %make-logical-pathname
158     (host device directory name type version))
159 phg 1.16 (:make-load-form-fun :just-dump-it-normally)))
160 ram 1.19
161     (declaim (freeze-type logical-pathname logical-host))
162 phg 1.16
163     ;;; %PRINT-LOGICAL-PATHNAME -- Internal
164 phg 1.13 ;;;
165 phg 1.16 ;;; The printed representation of the logical-pathname structure.
166     ;;; The potential conflict with search-lists requires isolating the printed
167     ;;; representation to use the i/o macro #.(logical-pathname <path-designator>).
168     ;;;
169     (defun %print-logical-pathname (pathname stream depth)
170 wlott 1.1 (declare (ignore depth))
171 phg 1.16 (let ((namestring (handler-case (namestring pathname)
172     (error nil))))
173     (cond (namestring
174 dtc 1.39 (if (or *print-escape* *print-readably*)
175     (format stream "#.(logical-pathname ~S)" namestring)
176     (format stream "~A" namestring)))
177 phg 1.16 (*print-readably*
178     (error "~S Cannot be printed readably." pathname))
179     (t
180     (funcall (formatter "#<Unprintable pathname, Host=~S, ~
181     Directory=~S, File=~S, Name=~S, Version=~S>")
182     stream
183     (%pathname-host pathname)
184     (%pathname-directory pathname)
185     (%pathname-name pathname)
186     (%pathname-type pathname)
187     (%pathname-version pathname))))))
188 wlott 1.1
189 pw 1.28 ;;; %MAKE-PATHNAME-OBJECT -- internal
190     ;;;
191     ;;; A pathname is logical if the host component is a logical-host.
192     ;;; This constructor is used to make an instance of the correct type
193     ;;; from parsed arguments.
194    
195     (defun %make-pathname-object (host device directory name type version)
196     (if (typep host 'logical-host)
197     (%make-logical-pathname host :unspecific directory name type version)
198     (%make-pathname host device directory name type version)))
199    
200 phg 1.16 ;;; *LOGICAL-HOSTS* --internal.
201     ;;;
202     ;;; Hash table searching maps a logical-pathname's host to their physical
203     ;;; pathname translation.
204    
205     (defvar *logical-hosts* (make-hash-table :test #'equal))
206    
207 ram 1.17 ;;; PATH-DESIGNATOR -- internal type
208 phg 1.16 ;;;
209     (deftype path-designator ()
210     "A path specification, either a string, stream or pathname."
211 ram 1.17 '(or string stream pathname))
212 phg 1.16
213 wlott 1.1
214     ;;;; Patterns
215    
216 phg 1.13 ;;; Patterns are a list of entries and wildcards used for pattern matches
217     ;;; of translations.
218    
219 wlott 1.1 (defstruct (pattern
220     (:print-function %print-pattern)
221     (:make-load-form-fun :just-dump-it-normally)
222     (:constructor make-pattern (pieces)))
223     (pieces nil :type list))
224    
225 phg 1.13 ;;; %PRINT-PATTERN -- Internal
226     ;;;
227 wlott 1.1 (defun %print-pattern (pattern stream depth)
228     (declare (ignore depth))
229     (print-unreadable-object (pattern stream :type t)
230     (if *print-pretty*
231     (let ((*print-escape* t))
232     (pprint-fill stream (pattern-pieces pattern) nil))
233     (prin1 (pattern-pieces pattern) stream))))
234    
235 phg 1.13 ;;; PATTERN= -- Internal
236     ;;;
237 wlott 1.1 (defun pattern= (pattern1 pattern2)
238     (declare (type pattern pattern1 pattern2))
239     (let ((pieces1 (pattern-pieces pattern1))
240     (pieces2 (pattern-pieces pattern2)))
241     (and (= (length pieces1) (length pieces2))
242     (every #'(lambda (piece1 piece2)
243     (typecase piece1
244     (simple-string
245     (and (simple-string-p piece2)
246     (string= piece1 piece2)))
247     (cons
248     (and (consp piece2)
249     (eq (car piece1) (car piece2))
250     (string= (cdr piece1) (cdr piece2))))
251     (t
252     (eq piece1 piece2))))
253     pieces1
254     pieces2))))
255    
256 phg 1.13 ;;; PATTERN-MATCHES -- Internal
257     ;;;
258 pw 1.30 ;;; If the string matches the pattern returns the multiple values T and a
259 phg 1.16 ;;; list of the matched strings.
260     ;;;
261 phg 1.13 (defun pattern-matches (pattern string)
262     (declare (type pattern pattern)
263     (type simple-string string))
264     (let ((len (length string)))
265     (labels ((maybe-prepend (subs cur-sub chars)
266     (if cur-sub
267     (let* ((len (length chars))
268     (new (make-string len))
269     (index len))
270     (dolist (char chars)
271     (setf (schar new (decf index)) char))
272     (cons new subs))
273     subs))
274     (matches (pieces start subs cur-sub chars)
275     (if (null pieces)
276     (if (= start len)
277     (values t (maybe-prepend subs cur-sub chars))
278     (values nil nil))
279     (let ((piece (car pieces)))
280     (etypecase piece
281     (simple-string
282     (let ((end (+ start (length piece))))
283     (and (<= end len)
284     (string= piece string
285     :start2 start :end2 end)
286     (matches (cdr pieces) end
287     (maybe-prepend subs cur-sub chars)
288     nil nil))))
289     (list
290     (ecase (car piece)
291     (:character-set
292     (and (< start len)
293     (let ((char (schar string start)))
294     (if (find char (cdr piece) :test #'char=)
295     (matches (cdr pieces) (1+ start) subs t
296     (cons char chars))))))))
297     ((member :single-char-wild)
298     (and (< start len)
299     (matches (cdr pieces) (1+ start) subs t
300     (cons (schar string start) chars))))
301 ram 1.17 ((member :multi-char-wild)
302 phg 1.13 (multiple-value-bind
303     (won new-subs)
304     (matches (cdr pieces) start subs t chars)
305     (if won
306     (values t new-subs)
307     (and (< start len)
308     (matches pieces (1+ start) subs t
309     (cons (schar string start)
310     chars)))))))))))
311     (multiple-value-bind
312     (won subs)
313     (matches (pattern-pieces pattern) 0 nil nil nil)
314     (values won (reverse subs))))))
315 wlott 1.1
316 phg 1.16
317 ram 1.17 ;;; DIRECTORY-COMPONENTS-MATCH -- Internal
318 phg 1.16 ;;;
319 dtc 1.35 ;;; Pathname-match-p for directory components. If thing is empty
320     ;;; then it matches :wild, (:absolute :wild-inferiors), or (:relative
321     ;;; :wild-inferiors).
322 phg 1.16 ;;;
323 ram 1.17 (defun directory-components-match (thing wild)
324     (or (eq thing wild)
325     (eq wild :wild)
326     (and (consp wild)
327     (let ((wild1 (first wild)))
328 dtc 1.35 (cond ((and (null thing) (member wild1 '(:absolute :relative)))
329     (equal (rest wild) '(:wild-inferiors)))
330     ((eq wild1 :wild-inferiors)
331     (let ((wild-subdirs (rest wild)))
332     (or (null wild-subdirs)
333     (loop
334     (when (directory-components-match thing
335     wild-subdirs)
336     (return t))
337     (pop thing)
338     (unless thing (return nil))))))
339     ((consp thing)
340     (and (components-match (first thing) wild1)
341     (directory-components-match (rest thing)
342     (rest wild)))))))))
343 phg 1.16
344    
345 phg 1.13 ;;; COMPONENTS-MATCH -- Internal
346     ;;;
347 ram 1.17 ;;; Return true if pathname component Thing is matched by Wild. Not
348     ;;; commutative.
349 phg 1.13 ;;;
350 ram 1.17 (defun components-match (thing wild)
351     (declare (type (or pattern symbol simple-string integer) thing wild))
352     (or (eq thing wild)
353     (eq wild :wild)
354     (typecase thing
355 phg 1.13 (simple-base-string
356 ram 1.17 ;; String is matched by itself, a matching pattern or :WILD.
357     (typecase wild
358 phg 1.16 (pattern
359 ram 1.17 (values (pattern-matches wild thing)))
360 phg 1.13 (simple-base-string
361 ram 1.17 (string= thing wild))))
362 phg 1.13 (pattern
363 ram 1.17 ;; A pattern is only matched by an identical pattern.
364     (and (pattern-p wild) (pattern= thing wild)))
365     (integer
366     ;; an integer (version number) is matched by :WILD or the same
367     ;; integer. This branch will actually always be NIL as long is the
368     ;; version is a fixnum.
369     (eql thing wild)))))
370 phg 1.13
371 ram 1.17
372 phg 1.13 ;;; COMPARE-COMPONENT -- Internal
373     ;;;
374     ;;; A predicate for comparing two pathname slot component sub-entries.
375     ;;;
376 wlott 1.1 (defun compare-component (this that)
377     (or (eql this that)
378     (typecase this
379     (simple-string
380     (and (simple-string-p that)
381     (string= this that)))
382     (pattern
383     (and (pattern-p that)
384     (pattern= this that)))
385     (cons
386     (and (consp that)
387     (compare-component (car this) (car that))
388     (compare-component (cdr this) (cdr that)))))))
389    
390    
391 phg 1.13 ;;;; Pathname functions.
392 wlott 1.1
393 phg 1.13 ;;; Implementation determined defaults to pathname slots.
394 wlott 1.1
395     (defvar *default-pathname-defaults*)
396    
397 phg 1.13 ;;; PATHNAME= -- Internal
398     ;;;
399 wlott 1.1 (defun pathname= (pathname1 pathname2)
400 phg 1.16 (declare (type pathname pathname1)
401     (type pathname pathname2))
402 wlott 1.1 (and (eq (%pathname-host pathname1)
403     (%pathname-host pathname2))
404     (compare-component (%pathname-device pathname1)
405     (%pathname-device pathname2))
406     (compare-component (%pathname-directory pathname1)
407     (%pathname-directory pathname2))
408     (compare-component (%pathname-name pathname1)
409     (%pathname-name pathname2))
410     (compare-component (%pathname-type pathname1)
411     (%pathname-type pathname2))
412     (compare-component (%pathname-version pathname1)
413     (%pathname-version pathname2))))
414    
415 phg 1.13 ;;; WITH-PATHNAME -- Internal
416 phg 1.16 ;;; Converts the expr, a pathname designator (a pathname, or string, or
417 phg 1.13 ;;; stream), into a pathname.
418     ;;;
419 wlott 1.1 (defmacro with-pathname ((var expr) &body body)
420     `(let ((,var (let ((,var ,expr))
421     (etypecase ,var
422     (pathname ,var)
423     (string (parse-namestring ,var))
424 ram 1.21 (stream (file-name ,var))))))
425 wlott 1.1 ,@body))
426    
427 phg 1.16 ;;; WITH-HOST -- Internal
428     ;;;
429     ;;; Converts the var, a host or string name for a host, into a logical-host
430     ;;; structure or nil if not defined.
431     ;;;
432 pw 1.28 ;;; pw notes 1/12/97 this potentially useful macro is not used anywhere
433     ;;; and 'find-host' is not defined. 'find-logical-host' seems to be needed.
434     ;;;
435 phg 1.16 (defmacro with-host ((var expr) &body body)
436     `(let ((,var (let ((,var ,expr))
437     (typecase ,var
438     (logical-host ,var)
439 pw 1.28 (string (find-logical-host ,var nil))
440 phg 1.16 (t nil)))))
441     ,@body))
442 wlott 1.1
443 phg 1.13 ;;; PATHNAME -- Interface
444     ;;;
445 wlott 1.1 (defun pathname (thing)
446 phg 1.13 "Convert thing (a pathname, string or stream) into a pathname."
447 phg 1.16 (declare (type path-designator thing))
448 wlott 1.1 (with-pathname (pathname thing)
449     pathname))
450    
451 phg 1.13 ;;; MAYBE-DIDDLE-CASE -- Internal
452     ;;;
453     ;;; Change the case of thing if diddle-p T.
454     ;;;
455 wlott 1.1 (defun maybe-diddle-case (thing diddle-p)
456 ram 1.17 (if (and diddle-p (not (or (symbolp thing) (integerp thing))))
457 wlott 1.1 (labels ((check-for (pred in)
458 ram 1.17 (typecase in
459 wlott 1.1 (pattern
460     (dolist (piece (pattern-pieces in))
461     (when (typecase piece
462     (simple-string
463     (check-for pred piece))
464     (cons
465     (case (car in)
466     (:character-set
467     (check-for pred (cdr in))))))
468     (return t))))
469     (list
470     (dolist (x in)
471     (when (check-for pred x)
472     (return t))))
473     (simple-base-string
474     (dotimes (i (length in))
475     (when (funcall pred (schar in i))
476     (return t))))
477 ram 1.17 (t nil)))
478 wlott 1.1 (diddle-with (fun thing)
479 ram 1.17 (typecase thing
480 wlott 1.1 (pattern
481     (make-pattern
482     (mapcar #'(lambda (piece)
483     (typecase piece
484     (simple-base-string
485 pw 1.29 (funcall fun piece))
486 wlott 1.1 (cons
487     (case (car piece)
488     (:character-set
489     (cons :character-set
490     (funcall fun (cdr piece))))
491     (t
492     piece)))
493     (t
494     piece)))
495     (pattern-pieces thing))))
496     (list
497     (mapcar fun thing))
498 phg 1.12 (simple-base-string
499     (funcall fun thing))
500 ram 1.17 (t
501 phg 1.12 thing))))
502 wlott 1.1 (let ((any-uppers (check-for #'upper-case-p thing))
503     (any-lowers (check-for #'lower-case-p thing)))
504     (cond ((and any-uppers any-lowers)
505     ;; Mixed case, stays the same.
506     thing)
507 phg 1.12 (any-uppers
508     ;; All uppercase, becomes all lower case.
509     (diddle-with #'(lambda (x) (if (stringp x)
510     (string-downcase x)
511     x)) thing))
512     (any-lowers
513     ;; All lowercase, becomes all upper case.
514     (diddle-with #'(lambda (x) (if (stringp x)
515     (string-upcase x)
516     x)) thing))
517     (t
518     ;; No letters? I guess just leave it.
519     thing))))
520 wlott 1.1 thing))
521    
522 ram 1.17
523 phg 1.13 ;;; MERGE-DIRECTORIES -- Internal
524     ;;;
525 wlott 1.1 (defun merge-directories (dir1 dir2 diddle-case)
526 wlott 1.6 (if (or (eq (car dir1) :absolute)
527     (null dir2))
528 wlott 1.1 dir1
529     (let ((results nil))
530     (flet ((add (dir)
531     (if (and (eq dir :back)
532     results
533     (not (eq (car results) :back)))
534     (pop results)
535     (push dir results))))
536     (dolist (dir (maybe-diddle-case dir2 diddle-case))
537     (add dir))
538     (dolist (dir (cdr dir1))
539     (add dir)))
540     (reverse results))))
541    
542 phg 1.13 ;;; MERGE-PATHNAMES -- Interface
543     ;;;
544 wlott 1.1 (defun merge-pathnames (pathname
545     &optional
546     (defaults *default-pathname-defaults*)
547     (default-version :newest))
548 phg 1.13 "Construct a filled in pathname by completing the unspecified components
549     from the defaults."
550 phg 1.16 (declare (type path-designator pathname)
551     (type path-designator defaults)
552     (values pathname))
553 wlott 1.1 (with-pathname (defaults defaults)
554 wlott 1.2 (let ((pathname (let ((*default-pathname-defaults* defaults))
555     (pathname pathname))))
556 wlott 1.1 (let* ((default-host (%pathname-host defaults))
557     (pathname-host (%pathname-host pathname))
558     (diddle-case
559     (and default-host pathname-host
560     (not (eq (host-customary-case default-host)
561     (host-customary-case pathname-host))))))
562 pw 1.28 (%make-pathname-object
563     (or pathname-host default-host)
564     (or (%pathname-device pathname)
565     (maybe-diddle-case (%pathname-device defaults)
566     diddle-case))
567     (merge-directories (%pathname-directory pathname)
568     (%pathname-directory defaults)
569     diddle-case)
570     (or (%pathname-name pathname)
571     (maybe-diddle-case (%pathname-name defaults)
572     diddle-case))
573     (or (%pathname-type pathname)
574     (maybe-diddle-case (%pathname-type defaults)
575     diddle-case))
576     (or (%pathname-version pathname)
577     default-version))))))
578 wlott 1.1
579 phg 1.13 ;;; IMPORT-DIRECTORY -- Internal
580     ;;;
581 wlott 1.1 (defun import-directory (directory diddle-case)
582     (etypecase directory
583     (null nil)
584 ram 1.17 ((member :wild) '(:absolute :wild-inferiors))
585     ((member :unspecific) '(:relative))
586 wlott 1.1 (list
587     (collect ((results))
588     (ecase (pop directory)
589     (:absolute
590     (results :absolute)
591     (when (search-list-p (car directory))
592     (results (pop directory))))
593     (:relative
594     (results :relative)))
595     (dolist (piece directory)
596 ram 1.17 (cond ((member piece '(:wild :wild-inferiors :up :back))
597 phg 1.12 (results piece))
598 wlott 1.1 ((or (simple-string-p piece) (pattern-p piece))
599     (results (maybe-diddle-case piece diddle-case)))
600     ((stringp piece)
601     (results (maybe-diddle-case (coerce piece 'simple-string)
602     diddle-case)))
603     (t
604     (error "~S is not allowed as a directory component." piece))))
605     (results)))
606     (simple-string
607     `(:absolute
608     ,(maybe-diddle-case directory diddle-case)))
609     (string
610     `(:absolute
611     ,(maybe-diddle-case (coerce directory 'simple-string)
612     diddle-case)))))
613    
614 phg 1.13 ;;; MAKE-PATHNAME -- Interface
615     ;;;
616 phg 1.16 (defun make-pathname (&key host
617 ram 1.11 (device nil devp)
618     (directory nil dirp)
619     (name nil namep)
620     (type nil typep)
621     (version nil versionp)
622 phg 1.16 defaults
623     (case :local))
624 ram 1.27 "Makes a new pathname from the component arguments. Note that host is
625     a host-structure or string."
626     (declare (type (or string host component-tokens) host)
627 dtc 1.32 (type (or string component-tokens) device)
628 ram 1.17 (type (or list string pattern component-tokens) directory)
629     (type (or string pattern component-tokens) name type)
630     (type (or integer component-tokens (member :newest)) version)
631 phg 1.16 (type (or path-designator null) defaults)
632 wlott 1.1 (type (member :common :local) case))
633 phg 1.16 (let* ((defaults (when defaults
634     (with-pathname (defaults defaults) defaults)))
635 wlott 1.1 (default-host (if defaults
636     (%pathname-host defaults)
637     (pathname-host *default-pathname-defaults*)))
638 ram 1.27 ;; toy@rtp.ericsson.se: CLHS says make-pathname can take a
639     ;; string (as a logical-host) for the host part. We map that
640     ;; string into the corresponding logical host structure.
641 pw 1.28
642     ;; pw@snoopy.mv.com:
643     ;; HyperSpec says for the arg to MAKE-PATHNAME;
644     ;; "host---a valid physical pathname host. ..."
645     ;; where it probably means -- a valid pathname host.
646     ;; "valid pathname host n. a valid physical pathname host or
647     ;; a valid logical pathname host."
648     ;; and defines
649     ;; "valid physical pathname host n. any of a string,
650     ;; a list of strings, or the symbol :unspecific,
651     ;; that is recognized by the implementation as the name of a host."
652     ;; "valid logical pathname host n. a string that has been defined
653     ;; as the name of a logical host. ..."
654     ;; HS is silent on what happens if the :host arg is NOT one of these.
655     ;; It seems an error message is appropriate.
656     (host (typecase host
657     (host host) ; A valid host, use it.
658     (string (find-logical-host host t)) ; logical-host or lose.
659     (t default-host))) ; unix-host
660 ram 1.18 (diddle-args (and (eq (host-customary-case host) :lower)
661     (eq case :common)))
662 wlott 1.1 (diddle-defaults
663     (not (eq (host-customary-case host)
664 phg 1.16 (host-customary-case default-host))))
665     (dev (if devp device (if defaults (%pathname-device defaults))))
666     (dir (import-directory directory diddle-args))
667     (ver (cond
668     (versionp version)
669     (defaults (%pathname-version defaults))
670     (t nil))))
671     (when (and defaults (not dirp))
672     (setf dir
673     (merge-directories dir
674     (%pathname-directory defaults)
675     diddle-defaults)))
676    
677 ram 1.11 (macrolet ((pick (var varp field)
678 ram 1.17 `(cond ((or (simple-string-p ,var)
679 wlott 1.1 (pattern-p ,var))
680     (maybe-diddle-case ,var diddle-args))
681     ((stringp ,var)
682     (maybe-diddle-case (coerce ,var 'simple-string)
683     diddle-args))
684 ram 1.11 (,varp
685 wlott 1.1 (maybe-diddle-case ,var diddle-args))
686     (defaults
687     (maybe-diddle-case (,field defaults)
688     diddle-defaults))
689     (t
690     nil))))
691 pw 1.28 (%make-pathname-object host
692     dev ; forced to :unspecific when logical-host
693     dir
694     (pick name namep %pathname-name)
695     (pick type typep %pathname-type)
696     ver))))
697 wlott 1.1
698 phg 1.13 ;;; PATHNAME-HOST -- Interface
699     ;;;
700 wlott 1.1 (defun pathname-host (pathname &key (case :local))
701 phg 1.13 "Accessor for the pathname's host."
702 phg 1.16 (declare (type path-designator pathname)
703 wlott 1.1 (type (member :local :common) case)
704 phg 1.16 (values host)
705 wlott 1.1 (ignore case))
706     (with-pathname (pathname pathname)
707     (%pathname-host pathname)))
708    
709 phg 1.13 ;;; PATHNAME-DEVICE -- Interface
710     ;;;
711 wlott 1.1 (defun pathname-device (pathname &key (case :local))
712 phg 1.13 "Accessor for pathname's device."
713 phg 1.16 (declare (type path-designator pathname)
714 wlott 1.1 (type (member :local :common) case))
715     (with-pathname (pathname pathname)
716     (maybe-diddle-case (%pathname-device pathname)
717     (and (eq case :common)
718     (eq (host-customary-case
719     (%pathname-host pathname))
720     :lower)))))
721    
722 phg 1.13 ;;; PATHNAME-DIRECTORY -- Interface
723     ;;;
724 wlott 1.1 (defun pathname-directory (pathname &key (case :local))
725 phg 1.13 "Accessor for the pathname's directory list."
726 phg 1.16 (declare (type path-designator pathname)
727 wlott 1.1 (type (member :local :common) case))
728     (with-pathname (pathname pathname)
729     (maybe-diddle-case (%pathname-directory pathname)
730     (and (eq case :common)
731     (eq (host-customary-case
732     (%pathname-host pathname))
733     :lower)))))
734 phg 1.13 ;;; PATHNAME-NAME -- Interface
735     ;;;
736 wlott 1.1 (defun pathname-name (pathname &key (case :local))
737 phg 1.13 "Accessor for the pathname's name."
738 phg 1.16 (declare (type path-designator pathname)
739 wlott 1.1 (type (member :local :common) case))
740     (with-pathname (pathname pathname)
741     (maybe-diddle-case (%pathname-name pathname)
742     (and (eq case :common)
743     (eq (host-customary-case
744     (%pathname-host pathname))
745     :lower)))))
746    
747 phg 1.13 ;;; PATHNAME-TYPE
748     ;;;
749 wlott 1.1 (defun pathname-type (pathname &key (case :local))
750 phg 1.13 "Accessor for the pathname's name."
751 phg 1.16 (declare (type path-designator pathname)
752 wlott 1.1 (type (member :local :common) case))
753     (with-pathname (pathname pathname)
754     (maybe-diddle-case (%pathname-type pathname)
755     (and (eq case :common)
756     (eq (host-customary-case
757     (%pathname-host pathname))
758     :lower)))))
759 phg 1.16
760 phg 1.13 ;;; PATHNAME-VERSION
761     ;;;
762 wlott 1.1 (defun pathname-version (pathname)
763 phg 1.13 "Accessor for the pathname's version."
764 phg 1.16 (declare (type path-designator pathname))
765 wlott 1.1 (with-pathname (pathname pathname)
766     (%pathname-version pathname)))
767    
768 phg 1.13
769     ;;;; Namestrings
770    
771     ;;; %PRINT-NAMESTRING-PARSE-ERROR -- Internal
772     ;;;
773     (defun %print-namestring-parse-error (condition stream)
774     (format stream "Parse error in namestring: ~?~% ~A~% ~V@T^"
775     (namestring-parse-error-complaint condition)
776     (namestring-parse-error-arguments condition)
777     (namestring-parse-error-namestring condition)
778     (namestring-parse-error-offset condition)))
779    
780 ram 1.17 (define-condition namestring-parse-error (parse-error)
781 ram 1.24 ((complaint :reader namestring-parse-error-complaint :initarg :complaint)
782     (arguments :reader namestring-parse-error-arguments :initarg :arguments
783     :initform nil)
784     (namestring :reader namestring-parse-error-namestring :initarg :namestring)
785     (offset :reader namestring-parse-error-offset :initarg :offset))
786 phg 1.13 (:report %print-namestring-parse-error))
787    
788    
789 ram 1.17 ;;; %PARSE-NAMESTRING -- Internal
790 phg 1.16 ;;;
791 ram 1.17 ;;; Handle the case where parse-namestring is actually parsing a namestring.
792     ;;; We pick off the :JUNK-ALLOWED case then find a host to use for parsing,
793     ;;; call the parser, then check if the host matches.
794     ;;;
795     (defun %parse-namestring (namestr host defaults start end junk-allowed)
796 dtc 1.41 (declare (type string namestr)
797     (type (or host null) host)
798     (type index start)
799     (type (or index null) end))
800 ram 1.17 (if junk-allowed
801     (handler-case
802     (%parse-namestring namestr host defaults start end nil)
803     (namestring-parse-error (condition)
804     (values nil (namestring-parse-error-offset condition))))
805     (let* ((end (or end (length namestr)))
806     (parse-host (or host
807     (extract-logical-host-prefix namestr start end)
808     (pathname-host defaults))))
809     (unless parse-host
810     (error "When Host arg is not supplied, Defaults arg must ~
811     have a non-null PATHNAME-HOST."))
812 phg 1.16
813 ram 1.17 (multiple-value-bind
814     (new-host device directory file type version)
815     (funcall (host-parse parse-host) namestr start end)
816     (when (and host new-host (not (eq new-host host)))
817     (error "Host in namestring: ~S~@
818     does not match explicit host argument: ~S"
819 pw 1.43 namestr host))
820 ram 1.17 (let ((pn-host (or new-host parse-host)))
821 pw 1.28 (values (%make-pathname-object
822     pn-host device directory file type version)
823 ram 1.17 end))))))
824    
825    
826     ;;; EXTRACT-LOGICAL-HOST-PREFIX -- Internal
827 phg 1.16 ;;;
828 ram 1.17 ;;; If namestr begins with a colon-terminated, defined, logical host, then
829     ;;; return that host, otherwise return NIL.
830 phg 1.16 ;;;
831 ram 1.17 (defun extract-logical-host-prefix (namestr start end)
832 phg 1.16 (declare (type simple-base-string namestr)
833     (type index start end)
834 ram 1.17 (values (or logical-host null)))
835     (let ((colon-pos (position #\: namestr :start start :end end)))
836     (if colon-pos
837 pw 1.44 (values (find-logical-host (nstring-upcase (subseq namestr start colon-pos)) nil))
838 pw 1.43 nil)))
839 phg 1.16
840 phg 1.13 ;;; PARSE-NAMESTRING -- Interface
841     ;;;
842     (defun parse-namestring (thing
843     &optional host (defaults *default-pathname-defaults*)
844     &key (start 0) end junk-allowed)
845 phg 1.16 "Converts pathname, a pathname designator, into a pathname structure,
846     for a physical pathname, returns the printed representation. Host may be
847     a physical host structure or host namestring."
848     (declare (type path-designator thing)
849 phg 1.13 (type (or null host) host)
850 phg 1.16 (type pathname defaults)
851 phg 1.13 (type index start)
852 dtc 1.41 (type (or index null) end))
853 dtc 1.40 (etypecase thing
854 ram 1.17 (simple-string
855     (%parse-namestring thing host defaults start end junk-allowed))
856     (string
857     (%parse-namestring (coerce thing 'simple-string)
858     host defaults start end junk-allowed))
859     (pathname
860 dtc 1.31 (let ((host (if host host (%pathname-host defaults))))
861     (unless (eq host (%pathname-host thing))
862 phg 1.16 (error "Hosts do not match: ~S and ~S."
863 dtc 1.31 host (%pathname-host thing))))
864 phg 1.16 (values thing start))
865     (stream
866 ram 1.21 (let ((name (file-name thing)))
867     (unless name
868 ram 1.17 (error "Can't figure out the file associated with stream:~% ~S"
869     thing))
870 dtc 1.40 (values name nil)))))
871 phg 1.13
872 ram 1.17
873 phg 1.13 ;;; NAMESTRING -- Interface
874     ;;;
875 wlott 1.1 (defun namestring (pathname)
876 phg 1.12 "Construct the full (name)string form of the pathname."
877 phg 1.16 (declare (type path-designator pathname)
878     (values (or null simple-base-string)))
879 wlott 1.1 (with-pathname (pathname pathname)
880 wlott 1.23 (when pathname
881     (let ((host (%pathname-host pathname)))
882     (unless host
883     (error "Cannot determine the namestring for pathnames with no ~
884     host:~% ~S" pathname))
885     (funcall (host-unparse host) pathname)))))
886 wlott 1.1
887 ram 1.17
888 phg 1.13 ;;; HOST-NAMESTRING -- Interface
889     ;;;
890 wlott 1.1 (defun host-namestring (pathname)
891 phg 1.13 "Returns a string representation of the name of the host in the pathname."
892 phg 1.16 (declare (type path-designator pathname)
893     (values (or null simple-base-string)))
894 wlott 1.1 (with-pathname (pathname pathname)
895     (let ((host (%pathname-host pathname)))
896     (if host
897     (funcall (host-unparse-host host) pathname)
898     (error
899     "Cannot determine the namestring for pathnames with no host:~% ~S"
900     pathname)))))
901    
902 phg 1.13 ;;; DIRECTORY-NAMESTRING -- Interface
903     ;;;
904 wlott 1.1 (defun directory-namestring (pathname)
905 phg 1.13 "Returns a string representation of the directories used in the pathname."
906 phg 1.16 (declare (type path-designator pathname)
907     (values (or null simple-base-string)))
908 wlott 1.1 (with-pathname (pathname pathname)
909     (let ((host (%pathname-host pathname)))
910     (if host
911     (funcall (host-unparse-directory host) pathname)
912     (error
913     "Cannot determine the namestring for pathnames with no host:~% ~S"
914     pathname)))))
915    
916 phg 1.13 ;;; FILE-NAMESTRING -- Interface
917     ;;;
918 wlott 1.1 (defun file-namestring (pathname)
919 phg 1.13 "Returns a string representation of the name used in the pathname."
920 phg 1.16 (declare (type path-designator pathname)
921     (values (or null simple-base-string)))
922 wlott 1.1 (with-pathname (pathname pathname)
923     (let ((host (%pathname-host pathname)))
924     (if host
925     (funcall (host-unparse-file host) pathname)
926     (error
927     "Cannot determine the namestring for pathnames with no host:~% ~S"
928     pathname)))))
929    
930 phg 1.13 ;;; ENOUGH-NAMESTRING -- Interface
931     ;;;
932 wlott 1.1 (defun enough-namestring (pathname
933     &optional (defaults *default-pathname-defaults*))
934 phg 1.13 "Returns an abbreviated pathname sufficent to identify the pathname relative
935     to the defaults."
936 phg 1.16 (declare (type path-designator pathname))
937 wlott 1.1 (with-pathname (pathname pathname)
938     (let ((host (%pathname-host pathname)))
939     (if host
940     (with-pathname (defaults defaults)
941     (funcall (host-unparse-enough host) pathname defaults))
942     (error
943     "Cannot determine the namestring for pathnames with no host:~% ~S"
944     pathname)))))
945    
946    
947     ;;;; Wild pathnames.
948    
949 phg 1.13 ;;; WILD-PATHNAME-P -- Interface
950     ;;;
951 wlott 1.1 (defun wild-pathname-p (pathname &optional field-key)
952 phg 1.13 "Predicate for determining whether pathname contains any wildcards."
953 phg 1.16 (declare (type path-designator pathname)
954 wlott 1.1 (type (member nil :host :device :directory :name :type :version)
955     field-key))
956     (with-pathname (pathname pathname)
957 ram 1.17 (flet ((frob (x)
958     (or (pattern-p x) (member x '(:wild :wild-inferiors)))))
959     (ecase field-key
960     ((nil)
961     (or (wild-pathname-p pathname :host)
962     (wild-pathname-p pathname :device)
963     (wild-pathname-p pathname :directory)
964     (wild-pathname-p pathname :name)
965     (wild-pathname-p pathname :type)
966     (wild-pathname-p pathname :version)))
967     (:host (frob (%pathname-host pathname)))
968 dtc 1.38 (:device (frob (%pathname-device pathname)))
969 ram 1.17 (:directory (some #'frob (%pathname-directory pathname)))
970     (:name (frob (%pathname-name pathname)))
971     (:type (frob (%pathname-type pathname)))
972     (:version (frob (%pathname-version pathname)))))))
973 wlott 1.1
974 ram 1.17
975     ;;; PATHNAME-MATCH-P -- Interface
976 phg 1.13 ;;;
977 phg 1.16 (defun pathname-match-p (in-pathname in-wildname)
978 phg 1.12 "Pathname matches the wildname template?"
979 phg 1.16 (declare (type path-designator in-pathname))
980     (with-pathname (pathname in-pathname)
981     (with-pathname (wildname in-wildname)
982 ram 1.17 (macrolet ((frob (field &optional (op 'components-match ))
983 wlott 1.1 `(or (null (,field wildname))
984 ram 1.17 (,op (,field pathname) (,field wildname)))))
985 phg 1.16 (and (or (null (%pathname-host wildname))
986 ram 1.17 (eq (%pathname-host wildname) (%pathname-host pathname)))
987 wlott 1.1 (frob %pathname-device)
988 ram 1.17 (frob %pathname-directory directory-components-match)
989 wlott 1.1 (frob %pathname-name)
990     (frob %pathname-type)
991 ram 1.17 (frob %pathname-version))))))
992 wlott 1.1
993 ram 1.17
994 phg 1.13 ;;; SUBSTITUTE-INTO -- Internal
995     ;;;
996 ram 1.17 ;;; Place the substitutions into the pattern and return the string or pattern
997     ;;; that results. If DIDDLE-CASE is true, we diddle the result case as well,
998     ;;; in case we are translating between hosts with difference conventional case.
999     ;;; The second value is the tail of subs with all of the values that we used up
1000     ;;; stripped off. Note that PATTERN-MATCHES matches all consecutive wildcards
1001     ;;; as a single string, so we ignore subsequent contiguous wildcards.
1002 phg 1.16 ;;;
1003 ram 1.17 (defun substitute-into (pattern subs diddle-case)
1004 wlott 1.1 (declare (type pattern pattern)
1005 phg 1.16 (type list subs)
1006 dtc 1.40 (values (or simple-base-string pattern) list))
1007 wlott 1.1 (let ((in-wildcard nil)
1008     (pieces nil)
1009     (strings nil))
1010     (dolist (piece (pattern-pieces pattern))
1011     (cond ((simple-string-p piece)
1012 ram 1.17 (push piece strings)
1013 wlott 1.1 (setf in-wildcard nil))
1014     (in-wildcard)
1015     (t
1016 ram 1.17 (setf in-wildcard t)
1017     (unless subs
1018     (error "Not enough wildcards in FROM pattern to match ~
1019     TO pattern:~% ~S"
1020     pattern))
1021 wlott 1.1 (let ((sub (pop subs)))
1022 ram 1.17 (typecase sub
1023 wlott 1.1 (pattern
1024     (when strings
1025     (push (apply #'concatenate 'simple-string
1026     (nreverse strings))
1027     pieces))
1028     (dolist (piece (pattern-pieces sub))
1029 ram 1.17 (push piece pieces)))
1030 wlott 1.1 (simple-string
1031 ram 1.17 (push sub strings))
1032     (t
1033     (error "Can't substitute this into the middle of a word:~
1034     ~% ~S"
1035     sub)))))))
1036    
1037 wlott 1.1 (when strings
1038 phg 1.16 (push (apply #'concatenate 'simple-string (nreverse strings))
1039 wlott 1.1 pieces))
1040 ram 1.17 (values
1041     (maybe-diddle-case
1042     (if (and pieces (simple-string-p (car pieces)) (null (cdr pieces)))
1043     (car pieces)
1044     (make-pattern (nreverse pieces)))
1045     diddle-case)
1046     subs)))
1047 wlott 1.1
1048 ram 1.17
1049     ;;; DIDNT-MATCH-ERROR -- Internal
1050     ;;;
1051     ;;; Called when we can't see how source and from matched.
1052     ;;;
1053     (defun didnt-match-error (source from)
1054     (error "Pathname components from Source and From args to TRANSLATE-PATHNAME~@
1055     did not match:~% ~S ~S"
1056     source from))
1057    
1058    
1059 phg 1.13 ;;; TRANSLATE-COMPONENT -- Internal
1060     ;;;
1061 ram 1.17 ;;; Do TRANSLATE-COMPONENT for all components except host and directory.
1062 phg 1.13 ;;;
1063 ram 1.17 (defun translate-component (source from to diddle-case)
1064 wlott 1.1 (typecase to
1065     (pattern
1066 ram 1.17 (typecase from
1067     (pattern
1068     (typecase source
1069     (pattern
1070     (if (pattern= from source)
1071     source
1072     (didnt-match-error source from)))
1073     (simple-string
1074     (multiple-value-bind
1075     (won subs)
1076     (pattern-matches from source)
1077     (if won
1078     (values (substitute-into to subs diddle-case))
1079     (didnt-match-error source from))))
1080     (t
1081     (maybe-diddle-case source diddle-case))))
1082     ((member :wild)
1083     (values (substitute-into to (list source) diddle-case)))
1084     (t
1085     (if (components-match source from)
1086     (maybe-diddle-case source diddle-case)
1087     (didnt-match-error source from)))))
1088 wlott 1.1 ((member nil :wild)
1089 ram 1.17 (maybe-diddle-case source diddle-case))
1090 wlott 1.1 (t
1091     (if (components-match source from)
1092     to
1093 ram 1.17 (didnt-match-error source from)))))
1094 wlott 1.1
1095 ram 1.17
1096     ;;; COMPUTE-DIRECTORY-SUBSTITUTIONS -- Internal
1097     ;;;
1098     ;;; Return a list of all the things that we want to substitute into the TO
1099     ;;; pattern (the things matched by from on source.) When From contains
1100     ;;; :WILD-INFERIORS, the result contains a sublist of the matched source
1101     ;;; subdirectories.
1102     ;;;
1103     (defun compute-directory-substitutions (orig-source orig-from)
1104     (let ((source orig-source)
1105     (from orig-from))
1106     (collect ((subs))
1107     (loop
1108     (unless source
1109     (unless (every #'(lambda (x) (eq x :wild-inferiors)) from)
1110     (didnt-match-error orig-source orig-from))
1111     (subs ())
1112     (return))
1113     (unless from (didnt-match-error orig-source orig-from))
1114     (let ((from-part (pop from))
1115     (source-part (pop source)))
1116     (typecase from-part
1117     (pattern
1118     (typecase source-part
1119     (pattern
1120     (if (pattern= from-part source-part)
1121     (subs source-part)
1122     (didnt-match-error orig-source orig-from)))
1123     (simple-string
1124     (multiple-value-bind
1125     (won new-subs)
1126     (pattern-matches from-part source-part)
1127     (if won
1128     (dolist (sub new-subs)
1129     (subs sub))
1130     (didnt-match-error orig-source orig-from))))
1131     (t
1132     (didnt-match-error orig-source orig-from))))
1133     ((member :wild)
1134     (subs source-part))
1135     ((member :wild-inferiors)
1136     (let ((remaining-source (cons source-part source)))
1137     (collect ((res))
1138     (loop
1139     (when (directory-components-match remaining-source from)
1140     (return))
1141     (unless remaining-source
1142     (didnt-match-error orig-source orig-from))
1143     (res (pop remaining-source)))
1144     (subs (res))
1145     (setq source remaining-source))))
1146     (simple-string
1147     (unless (and (simple-string-p source-part)
1148     (string= from-part source-part))
1149     (didnt-match-error orig-source orig-from)))
1150     (t
1151     (didnt-match-error orig-source orig-from)))))
1152     (subs))))
1153    
1154    
1155 phg 1.13 ;;; TRANSLATE-DIRECTORIES -- Internal
1156     ;;;
1157 ram 1.17 ;;; Called by TRANSLATE-PATHNAME on the directory components of its argument
1158     ;;; pathanames to produce the result directory component. If any leaves the
1159     ;;; directory NIL, we return the source directory. The :RELATIVE or :ABSOLUTE
1160 dtc 1.36 ;;; is taken from the source directory, except if TO is :ABSOLUTE, in which
1161     ;;; case the result will be :ABSOLUTE.
1162 ram 1.17 ;;;
1163     (defun translate-directories (source from to diddle-case)
1164     (if (not (and source to from))
1165 dtc 1.37 (let ((source (mapcar #'(lambda (x) (maybe-diddle-case x diddle-case))
1166     source)))
1167     (if (null to)
1168     source
1169     (collect ((res))
1170     (res (cond ((null source) (first to))
1171     ((eq (first to) :absolute) :absolute)
1172     (t (first source))))
1173     (let ((match (rest source)))
1174     (dolist (to-part (rest to))
1175     (cond ((eq to-part :wild)
1176     (when match
1177     (res (first match))
1178     (setf match nil)))
1179     ((eq to-part :wild-inferiors)
1180     (when match
1181     (dolist (src-part match)
1182     (res src-part))
1183     (setf match nil)))
1184     (t
1185     (res to-part)))))
1186     (res))))
1187 ram 1.17 (collect ((res))
1188 dtc 1.35 (res (if (eq (first to) :absolute)
1189     :absolute
1190     (first source)))
1191 ram 1.17 (let ((subs-left (compute-directory-substitutions (rest source)
1192     (rest from))))
1193     (dolist (to-part (rest to))
1194     (typecase to-part
1195     ((member :wild)
1196     (assert subs-left)
1197     (let ((match (pop subs-left)))
1198     (when (listp match)
1199     (error ":WILD-INFERIORS not paired in from and to ~
1200     patterns:~% ~S ~S" from to))
1201 dtc 1.33 (res (maybe-diddle-case match diddle-case))))
1202 ram 1.17 ((member :wild-inferiors)
1203     (assert subs-left)
1204     (let ((match (pop subs-left)))
1205     (unless (listp match)
1206     (error ":WILD-INFERIORS not paired in from and to ~
1207     patterns:~% ~S ~S" from to))
1208     (dolist (x match)
1209     (res (maybe-diddle-case x diddle-case)))))
1210     (pattern
1211     (multiple-value-bind
1212     (new new-subs-left)
1213     (substitute-into to-part subs-left diddle-case)
1214     (setf subs-left new-subs-left)
1215 dtc 1.33 (res new)))
1216 ram 1.17 (t (res to-part)))))
1217     (res))))
1218 wlott 1.1
1219 ram 1.17
1220 phg 1.13 ;;; TRANSLATE-PATHNAME -- Interface
1221     ;;;
1222 wlott 1.1 (defun translate-pathname (source from-wildname to-wildname &key)
1223 phg 1.13 "Use the source pathname to translate the from-wildname's wild and
1224     unspecified elements into a completed to-pathname based on the to-wildname."
1225 phg 1.16 (declare (type path-designator source from-wildname to-wildname))
1226 wlott 1.1 (with-pathname (source source)
1227     (with-pathname (from from-wildname)
1228     (with-pathname (to to-wildname)
1229 ram 1.17 (let* ((source-host (%pathname-host source))
1230     (to-host (%pathname-host to))
1231     (diddle-case
1232     (and source-host to-host
1233     (not (eq (host-customary-case source-host)
1234     (host-customary-case to-host))))))
1235     (macrolet ((frob (field &optional (op 'translate-component))
1236     `(let ((result (,op (,field source)
1237     (,field from)
1238     (,field to)
1239     diddle-case)))
1240 wlott 1.1 (if (eq result :error)
1241     (error "~S doesn't match ~S" source from)
1242 ram 1.17 result))))
1243 pw 1.28 (%make-pathname-object
1244     (or to-host source-host)
1245     (frob %pathname-device)
1246     (frob %pathname-directory translate-directories)
1247     (frob %pathname-name)
1248     (frob %pathname-type)
1249     (frob %pathname-version))))))))
1250 wlott 1.1
1251    
1252     ;;;; Search lists.
1253    
1254     ;;; The SEARCH-LIST structure.
1255     ;;;
1256     (defstruct (search-list
1257     (:print-function %print-search-list)
1258     (:make-load-form-fun
1259     (lambda (search-list)
1260     (values `(intern-search-list ',(search-list-name search-list))
1261     nil))))
1262     ;;
1263     ;; The name of this search-list. Always stored in lowercase.
1264     (name (required-argument) :type simple-string)
1265     ;;
1266     ;; T if this search-list has been defined. Otherwise NIL.
1267     (defined nil :type (member t nil))
1268     ;;
1269     ;; The list of expansions for this search-list. Each expansion is the list
1270     ;; of directory components to use in place of this search-list.
1271 ram 1.21 (expansions nil :type list))
1272 ram 1.4
1273 wlott 1.1 (defun %print-search-list (sl stream depth)
1274     (declare (ignore depth))
1275     (print-unreadable-object (sl stream :type t)
1276     (write-string (search-list-name sl) stream)))
1277    
1278     ;;; *SEARCH-LISTS* -- internal.
1279     ;;;
1280     ;;; Hash table mapping search-list names to search-list structures.
1281     ;;;
1282     (defvar *search-lists* (make-hash-table :test #'equal))
1283    
1284 pw 1.43 ;;; FIND-SEARCH-LIST -- internal
1285     ;;;
1286     (defun find-search-list (name &optional (flame-not-found-p t))
1287     (let ((search-list (gethash (string-downcase name) *search-lists*)))
1288     (if search-list search-list
1289     (when flame-not-found-p
1290     (error "Search-list ~a not defined." name)))))
1291    
1292 wlott 1.1 ;;; INTERN-SEARCH-LIST -- internal interface.
1293     ;;;
1294     ;;; When search-lists are encountered in namestrings, they are converted to
1295     ;;; search-list structures right then, instead of waiting until the search
1296     ;;; list used. This allows us to verify ahead of time that there are no
1297     ;;; circularities and makes expansion much quicker.
1298     ;;;
1299     (defun intern-search-list (name)
1300     (let ((name (string-downcase name)))
1301     (or (gethash name *search-lists*)
1302     (let ((new (make-search-list :name name)))
1303     (setf (gethash name *search-lists*) new)
1304     new))))
1305    
1306     ;;; CLEAR-SEARCH-LIST -- public.
1307     ;;;
1308     ;;; Clear the definition. Note: we can't remove it from the hash-table
1309     ;;; because there may be pathnames still refering to it. So we just clear
1310 pw 1.43 ;;; out the expansions and set defined to NIL.
1311 wlott 1.1 ;;;
1312     (defun clear-search-list (name)
1313     "Clear the current definition for the search-list NAME. Returns T if such
1314     a definition existed, and NIL if not."
1315     (let* ((name (string-downcase name))
1316     (search-list (gethash name *search-lists*)))
1317     (when (and search-list (search-list-defined search-list))
1318     (setf (search-list-defined search-list) nil)
1319     (setf (search-list-expansions search-list) nil)
1320     t)))
1321    
1322     ;;; CLEAR-ALL-SEARCH-LISTS -- sorta public.
1323     ;;;
1324     ;;; Again, we can't actually remove the entries from the hash-table, so we
1325     ;;; just mark them as being undefined.
1326     ;;;
1327     (defun clear-all-search-lists ()
1328     "Clear the definition for all search-lists. Only use this if you know
1329     what you are doing."
1330     (maphash #'(lambda (name search-list)
1331     (declare (ignore name))
1332     (setf (search-list-defined search-list) nil)
1333     (setf (search-list-expansions search-list) nil))
1334     *search-lists*)
1335     nil)
1336    
1337     ;;; EXTRACT-SEARCH-LIST -- internal.
1338     ;;;
1339     ;;; Extract the search-list from PATHNAME and return it. If PATHNAME
1340     ;;; doesn't start with a search-list, then either error (if FLAME-IF-NONE
1341     ;;; is true) or return NIL (if FLAME-IF-NONE is false).
1342     ;;;
1343     (defun extract-search-list (pathname flame-if-none)
1344     (with-pathname (pathname pathname)
1345     (let* ((directory (%pathname-directory pathname))
1346     (search-list (cadr directory)))
1347     (cond ((search-list-p search-list)
1348     search-list)
1349     (flame-if-none
1350 wlott 1.8 (error "~S doesn't start with a search-list." pathname))
1351 wlott 1.1 (t
1352     nil)))))
1353    
1354     ;;; SEARCH-LIST -- public.
1355     ;;;
1356     ;;; We have to convert the internal form of the search-list back into a
1357     ;;; bunch of pathnames.
1358     ;;;
1359     (defun search-list (pathname)
1360     "Return the expansions for the search-list starting PATHNAME. If PATHNAME
1361     does not start with a search-list, then an error is signaled. If
1362     the search-list has not been defined yet, then an error is signaled.
1363 phg 1.16 The expansion for a search-list can be set with SETF."
1364 wlott 1.1 (with-pathname (pathname pathname)
1365     (let ((search-list (extract-search-list pathname t))
1366 phg 1.16 (host (pathname-host pathname)))
1367 wlott 1.1 (if (search-list-defined search-list)
1368     (mapcar #'(lambda (directory)
1369     (make-pathname :host host
1370     :directory (cons :absolute directory)))
1371     (search-list-expansions search-list))
1372     (error "Search list ~S has not been defined yet." pathname)))))
1373 wlott 1.9
1374     ;;; SEARCH-LIST-DEFINED-P -- public.
1375     ;;;
1376     (defun search-list-defined-p (pathname)
1377     "Returns T if the search-list starting PATHNAME is currently defined, and
1378     NIL otherwise. An error is signaled if PATHNAME does not start with a
1379     search-list."
1380     (with-pathname (pathname pathname)
1381     (search-list-defined (extract-search-list pathname t))))
1382 wlott 1.1
1383     ;;; %SET-SEARCH-LIST -- public setf method
1384     ;;;
1385     ;;; Set the expansion for the search-list in PATHNAME. If this would result
1386     ;;; in any circularities, we flame out. If anything goes wrong, we leave the
1387     ;;; old defintion intact.
1388     ;;;
1389     (defun %set-search-list (pathname values)
1390     (let ((search-list (extract-search-list pathname t)))
1391     (labels
1392     ((check (target-list path)
1393     (when (eq search-list target-list)
1394     (error "That would result in a circularity:~% ~
1395     ~A~{ -> ~A~} -> ~A"
1396     (search-list-name search-list)
1397     (reverse path)
1398     (search-list-name target-list)))
1399     (when (search-list-p target-list)
1400     (push (search-list-name target-list) path)
1401     (dolist (expansion (search-list-expansions target-list))
1402     (check (car expansion) path))))
1403     (convert (pathname)
1404     (with-pathname (pathname pathname)
1405     (when (or (pathname-name pathname)
1406     (pathname-type pathname)
1407     (pathname-version pathname))
1408     (error "Search-lists cannot expand into pathnames that have ~
1409     a name, type, or ~%version specified:~% ~S"
1410     pathname))
1411     (let ((directory (pathname-directory pathname)))
1412 wlott 1.7 (let ((expansion
1413     (if directory
1414     (ecase (car directory)
1415     (:absolute (cdr directory))
1416     (:relative (cons (intern-search-list "default")
1417     (cdr directory))))
1418     (list (intern-search-list "default")))))
1419 wlott 1.1 (check (car expansion) nil)
1420     expansion)))))
1421     (setf (search-list-expansions search-list)
1422     (if (listp values)
1423     (mapcar #'convert values)
1424     (list (convert values)))))
1425     (setf (search-list-defined search-list) t))
1426     values)
1427    
1428     ;;; ENUMERATE-SEARCH-LIST -- public.
1429     ;;;
1430     (defmacro enumerate-search-list ((var pathname &optional result) &body body)
1431     "Execute BODY with VAR bound to each successive possible expansion for
1432     PATHNAME and then return RESULT. Note: if PATHNAME does not contain a
1433     search-list, then BODY is executed exactly once. Everything is wrapped
1434     in a block named NIL, so RETURN can be used to terminate early. Note:
1435     VAR is *not* bound inside of RESULT."
1436     (let ((body-name (gensym)))
1437     `(block nil
1438     (flet ((,body-name (,var)
1439     ,@body))
1440     (%enumerate-search-list ,pathname #',body-name)
1441     ,result))))
1442    
1443     (defun %enumerate-search-list (pathname function)
1444 ram 1.22 (let* ((pathname (if (logical-pathname-p pathname)
1445     (translate-logical-pathname pathname)
1446     pathname))
1447 ram 1.21 (search-list (extract-search-list pathname nil)))
1448 wlott 1.1 (cond
1449     ((not search-list)
1450     (funcall function pathname))
1451     ((not (search-list-defined search-list))
1452     (error "Undefined search list: ~A"
1453     (search-list-name search-list)))
1454     (t
1455     (let ((tail (cddr (pathname-directory pathname))))
1456     (dolist (expansion
1457     (search-list-expansions search-list))
1458     (%enumerate-search-list (make-pathname :defaults pathname
1459     :directory
1460     (cons :absolute
1461     (append expansion
1462     tail)))
1463     function)))))))
1464 phg 1.12
1465    
1466     ;;;; Logical pathname support. ANSI 92-102 specification.
1467 phg 1.16 ;;;; As logical-pathname translations are loaded they are canonicalized as
1468     ;;;; patterns to enable rapid efficent translation into physical pathnames.
1469 phg 1.12
1470 ram 1.17 ;;;; Utilities:
1471 phg 1.12
1472 ram 1.17 ;;; LOGICAL-WORD-OR-LOSE -- Internal
1473 phg 1.13 ;;;
1474 ram 1.17 ;;; Canonicalize a logical pathanme word by uppercasing it checking that it
1475     ;;; contains only legal characters.
1476 phg 1.16 ;;;
1477 ram 1.17 (defun logical-word-or-lose (word)
1478     (declare (string word))
1479     (let ((word (string-upcase word)))
1480     (dotimes (i (length word))
1481     (let ((ch (schar word i)))
1482     (unless (or (alpha-char-p ch) (digit-char-p ch) (char= ch #\-))
1483     (error 'namestring-parse-error
1484     :complaint "Logical namestring character ~
1485     is not alphanumeric or hyphen:~% ~S"
1486     :arguments (list ch)
1487     :namestring word :offset i))))
1488     word))
1489 phg 1.12
1490 ram 1.17
1491     ;;; FIND-LOGICAL-HOST -- Internal
1492     ;;;
1493     ;;; Given a logical host or string, return a logical host. If Error-p is
1494     ;;; NIL, then return NIL when no such host exists.
1495     ;;;
1496     (defun find-logical-host (thing &optional (errorp t))
1497     (etypecase thing
1498     (string
1499 pw 1.43 (let ((found (gethash (logical-word-or-lose thing)
1500     *logical-hosts*)))
1501 ram 1.17 (if (or found (not errorp))
1502     found
1503 dtc 1.34 (error 'simple-file-error
1504     :pathname thing
1505     :format-control "Logical host not yet defined: ~S"
1506     :format-arguments (list thing)))))
1507 ram 1.17 (logical-host thing)))
1508    
1509 pw 1.43
1510 phg 1.16 ;;; INTERN-LOGICAL-HOST -- Internal
1511 phg 1.13 ;;;
1512 ram 1.17 ;;; Given a logical host name or host, return a logical host, creating a new
1513     ;;; one if necessary.
1514 phg 1.16 ;;;
1515 ram 1.17 (defun intern-logical-host (thing)
1516     (declare (values logical-host))
1517     (or (find-logical-host thing nil)
1518     (let* ((name (logical-word-or-lose thing))
1519     (new (make-logical-host :name name)))
1520 phg 1.16 (setf (gethash name *logical-hosts*) new)
1521     new)))
1522 phg 1.12
1523 ram 1.17
1524     ;;;; Logical pathname parsing:
1525    
1526     ;;; MAYBE-MAKE-LOGICAL-PATTERN -- Internal
1527 phg 1.13 ;;;
1528 ram 1.17 ;;; Deal with multi-char wildcards in a logical pathname token.
1529 phg 1.16 ;;;
1530 ram 1.17 (defun maybe-make-logical-pattern (namestring chunks)
1531     (let ((chunk (caar chunks)))
1532     (collect ((pattern))
1533     (let ((last-pos 0)
1534     (len (length chunk)))
1535     (declare (fixnum last-pos))
1536     (loop
1537     (when (= last-pos len) (return))
1538     (let ((pos (or (position #\* chunk :start last-pos) len)))
1539     (if (= pos last-pos)
1540     (when (pattern)
1541     (error 'namestring-parse-error
1542     :complaint "Double asterisk inside of logical ~
1543     word: ~S"
1544     :arguments (list chunk)
1545     :namestring namestring
1546     :offset (+ (cdar chunks) pos)))
1547     (pattern (subseq chunk last-pos pos)))
1548     (if (= pos len)
1549     (return)
1550     (pattern :multi-char-wild))
1551     (setq last-pos (1+ pos)))))
1552     (assert (pattern))
1553     (if (cdr (pattern))
1554     (make-pattern (pattern))
1555     (let ((x (car (pattern))))
1556     (if (eq x :multi-char-wild)
1557     :wild
1558     x))))))
1559 phg 1.12
1560 ram 1.17
1561     ;;; LOGICAL-CHUNKIFY -- Internal
1562 phg 1.13 ;;;
1563 ram 1.17 ;;; Return a list of conses where the cdr is the start position and the car
1564     ;;; is a string (token) or character (punctuation.)
1565 phg 1.13 ;;;
1566 ram 1.17 (defun logical-chunkify (namestr start end)
1567     (collect ((chunks))
1568     (do ((i start (1+ i))
1569     (prev 0))
1570     ((= i end)
1571     (when (> end prev)
1572     (chunks (cons (nstring-upcase (subseq namestr prev end)) prev))))
1573     (let ((ch (schar namestr i)))
1574     (unless (or (alpha-char-p ch) (digit-char-p ch)
1575     (member ch '(#\- #\*)))
1576     (when (> i prev)
1577     (chunks (cons (nstring-upcase (subseq namestr prev i)) prev)))
1578     (setq prev (1+ i))
1579     (unless (member ch '(#\; #\: #\.))
1580     (error 'namestring-parse-error
1581     :complaint "Illegal character for logical pathname:~% ~S"
1582     :arguments (list ch)
1583     :namestring namestr
1584     :offset i))
1585     (chunks (cons ch i)))))
1586     (chunks)))
1587 phg 1.12
1588    
1589 phg 1.13 ;;; PARSE-LOGICAL-NAMESTRING -- Internal
1590     ;;;
1591 phg 1.16 ;;; Break up a logical-namestring, always a string, into its constituent
1592     ;;; parts.
1593 phg 1.13 ;;;
1594 ram 1.17 (defun parse-logical-namestring (namestr start end)
1595 phg 1.12 (declare (type simple-base-string namestr)
1596 ram 1.17 (type index start end))
1597     (collect ((directory))
1598     (let ((host nil)
1599     (name nil)
1600     (type nil)
1601     (version nil))
1602     (labels ((expecting (what chunks)
1603     (unless (and chunks (simple-string-p (caar chunks)))
1604     (error 'namestring-parse-error
1605     :complaint "Expecting ~A, got ~:[nothing~;~S~]."
1606     :arguments (list what (caar chunks))
1607     :namestring namestr
1608     :offset (if chunks (cdar chunks) end)))
1609     (caar chunks))
1610     (parse-host (chunks)
1611     (case (caadr chunks)
1612     (#\:
1613     (setq host
1614     (find-logical-host (expecting "a host name" chunks)))
1615     (parse-relative (cddr chunks)))
1616     (t
1617     (parse-relative chunks))))
1618     (parse-relative (chunks)
1619     (case (caar chunks)
1620     (#\;
1621     (directory :relative)
1622     (parse-directory (cdr chunks)))
1623     (t
1624 pw 1.30 (directory :absolute) ; Assumption! Maybe revoked later.
1625 ram 1.17 (parse-directory chunks))))
1626     (parse-directory (chunks)
1627     (case (caadr chunks)
1628     (#\;
1629     (directory
1630     (let ((res (expecting "a directory name" chunks)))
1631     (cond ((string= res "..") :up)
1632     ((string= res "**") :wild-inferiors)
1633     (t
1634     (maybe-make-logical-pattern namestr chunks)))))
1635     (parse-directory (cddr chunks)))
1636     (t
1637     (parse-name chunks))))
1638     (parse-name (chunks)
1639     (when chunks
1640     (expecting "a file name" chunks)
1641     (setq name (maybe-make-logical-pattern namestr chunks))
1642     (expecting-dot (cdr chunks))))
1643     (expecting-dot (chunks)
1644     (when chunks
1645     (unless (eql (caar chunks) #\.)
1646     (error 'namestring-parse-error
1647     :complaint "Expecting a dot, got ~S."
1648     :arguments (list (caar chunks))
1649     :namestring namestr
1650     :offset (cdar chunks)))
1651     (if type
1652     (parse-version (cdr chunks))
1653     (parse-type (cdr chunks)))))
1654     (parse-type (chunks)
1655     (expecting "a file type" chunks)
1656     (setq type (maybe-make-logical-pattern namestr chunks))
1657     (expecting-dot (cdr chunks)))
1658     (parse-version (chunks)
1659     (let ((str (expecting "a positive integer, * or NEWEST"
1660     chunks)))
1661     (cond
1662     ((string= str "*") (setq version :wild))
1663     ((string= str "NEWEST") (setq version :newest))
1664     (t
1665     (multiple-value-bind
1666     (res pos)
1667     (parse-integer str :junk-allowed t)
1668     (unless (and res (plusp res))
1669     (error 'namestring-parse-error
1670     :complaint "Expected a positive integer, ~
1671     got ~S"
1672     :arguments (list str)
1673     :namestring namestr
1674     :offset (+ pos (cdar chunks))))
1675     (setq version res)))))
1676     (when (cdr chunks)
1677     (error 'namestring-parse-error
1678     :complaint "Extra stuff after end of file name."
1679     :namestring namestr
1680     :offset (cdadr chunks)))))
1681     (parse-host (logical-chunkify namestr start end)))
1682 pw 1.30 (values host :unspecific
1683     (and (not (equal (directory)'(:absolute)))(directory))
1684     name type version))))
1685 phg 1.12
1686 ram 1.17
1687     ;;; Can't defvar here because not all host methods are loaded yet.
1688     (declaim (special *logical-pathname-defaults*))
1689    
1690     ;;; LOGICAL-PATHNAME -- Public
1691 phg 1.13 ;;;
1692 ram 1.17 (defun logical-pathname (pathspec)
1693     "Converts the pathspec argument to a logical-pathname and returns it."
1694     (declare (type (or logical-pathname string stream) pathspec)
1695     (values logical-pathname))
1696     (if (typep pathspec 'logical-pathname)
1697     pathspec
1698     (let ((res (parse-namestring pathspec nil *logical-pathname-defaults*)))
1699     (when (eq (%pathname-host res)
1700     (%pathname-host *logical-pathname-defaults*))
1701 pw 1.43 (error
1702     'simple-type-error
1703     :format-control "Logical namestring does not specify a host:~% ~S"
1704     :format-arguments (list pathspec)
1705     :datum pathspec
1706     :expected-type '(satisfies logical-pathname-namestring-p)))
1707 ram 1.17 res)))
1708 phg 1.12
1709 pw 1.43
1710 ram 1.17
1711     ;;;; Logical pathname unparsing:
1712    
1713 phg 1.13 ;;; UNPARSE-LOGICAL-DIRECTORY -- Internal
1714     ;;;
1715 phg 1.12 (defun unparse-logical-directory (pathname)
1716 ram 1.17 (declare (type pathname pathname))
1717     (collect ((pieces))
1718     (let ((directory (%pathname-directory pathname)))
1719     (when directory
1720     (ecase (pop directory)
1721     (:absolute) ;; Nothing special.
1722     (:relative (pieces ";")))
1723     (dolist (dir directory)
1724     (cond ((or (stringp dir) (pattern-p dir))
1725     (pieces (unparse-logical-piece dir))
1726     (pieces ";"))
1727     ((eq dir :wild)
1728     (pieces "*;"))
1729     ((eq dir :wild-inferiors)
1730     (pieces "**;"))
1731     (t
1732     (error "Invalid directory component: ~S" dir))))))
1733     (apply #'concatenate 'simple-string (pieces))))
1734 phg 1.12
1735 ram 1.17
1736 phg 1.13 ;;; UNPARSE-LOGICAL-PIECE -- Internal
1737     ;;;
1738 phg 1.12 (defun unparse-logical-piece (thing)
1739     (etypecase thing
1740 ram 1.17 (simple-string thing)
1741 phg 1.12 (pattern
1742     (collect ((strings))
1743 ram 1.17 (dolist (piece (pattern-pieces thing))
1744     (etypecase piece
1745     (simple-string (strings piece))
1746     (keyword
1747     (cond ((eq piece :wild-inferiors)
1748     (strings "**"))
1749     ((eq piece :multi-char-wild)
1750     (strings "*"))
1751     (t (error "Invalid keyword: ~S" piece))))))
1752     (apply #'concatenate 'simple-string (strings))))))
1753 phg 1.12
1754 dtc 1.36 ;;; UNPARSE-ENOUGH-NAMESTRING -- Internal
1755     ;;;
1756     (defun unparse-enough-namestring (pathname defaults)
1757     (let* ((path-dir (pathname-directory pathname))
1758     (def-dir (pathname-directory defaults))
1759     (enough-dir
1760     ;; Go down the directory lists to see what matches. What's
1761     ;; left is what we want, more or less.
1762     (cond ((and (eq (first path-dir) (first def-dir))
1763     (eq (first path-dir) :absolute))
1764     ;; Both paths are :absolute, so find where the common
1765     ;; parts end and return what's left
1766     (do* ((p (rest path-dir) (rest p))
1767     (d (rest def-dir) (rest d)))
1768     ((or (endp p) (endp d)
1769     (not (equal (first p) (first d))))
1770     `(:relative ,@p))))
1771     (t
1772     ;; At least one path is :relative, so just return the
1773     ;; original path. If the original path is :relative,
1774     ;; then that's the right one. If PATH-DIR is
1775     ;; :absolute, we want to return that except when
1776     ;; DEF-DIR is :absolute, as handled above. so return
1777     ;; the original directory.
1778     path-dir))))
1779     (make-pathname :host (pathname-host pathname)
1780     :directory enough-dir
1781     :name (pathname-name pathname)
1782     :type (pathname-type pathname)
1783     :version (pathname-version pathname))))
1784 phg 1.12
1785 phg 1.13 ;;; UNPARSE-LOGICAL-NAMESTRING -- Internal
1786     ;;;
1787 phg 1.12 (defun unparse-logical-namestring (pathname)
1788     (declare (type logical-pathname pathname))
1789     (concatenate 'simple-string
1790 ram 1.17 (logical-host-name (%pathname-host pathname)) ":"
1791 phg 1.12 (unparse-logical-directory pathname)
1792 ram 1.17 (unparse-unix-file pathname)))
1793 phg 1.12
1794 ram 1.17
1795     ;;;; Logical pathname translations:
1796 phg 1.12
1797 ram 1.17 ;;; CANONICALIZE-LOGICAL-PATHNAME-TRANSLATIONS -- Internal
1798 phg 1.13 ;;;
1799     ;;; Verify that the list of translations consists of lists and prepare
1800 phg 1.16 ;;; canonical translations (parse pathnames and expand out wildcards into
1801     ;;; patterns).
1802 phg 1.13 ;;;
1803 ram 1.17 (defun canonicalize-logical-pathname-translations (transl-list host)
1804     (declare (type list transl-list) (type host host)
1805     (values list))
1806     (collect ((res))
1807     (dolist (tr transl-list)
1808     (unless (and (consp tr) (= (length tr) 2))
1809     (error "Logical pathname translation is not a two-list:~% ~S"
1810     tr))
1811     (let ((from (first tr)))
1812     (res (list (if (typep from 'logical-pathname)
1813     from
1814     (parse-namestring from host))
1815     (pathname (second tr))))))
1816     (res)))
1817 phg 1.12
1818 ram 1.17
1819 phg 1.13 ;;; LOGICAL-PATHNAME-TRANSLATIONS -- Public
1820     ;;;
1821 phg 1.12 (defun logical-pathname-translations (host)
1822     "Return the (logical) host object argument's list of translations."
1823 ram 1.17 (declare (type (or string logical-host) host)
1824 phg 1.12 (values list))
1825 ram 1.17 (logical-host-translations (find-logical-host host)))
1826 phg 1.12
1827 phg 1.13 ;;; (SETF LOGICAL-PATHNAME-TRANSLATIONS) -- Public
1828     ;;;
1829 phg 1.12 (defun (setf logical-pathname-translations) (translations host)
1830     "Set the translations list for the logical host argument.
1831     Return translations."
1832 ram 1.17 (declare (type (or string logical-host) host)
1833 phg 1.12 (type list translations)
1834     (values list))
1835    
1836 ram 1.17 (let ((host (intern-logical-host host)))
1837     (setf (logical-host-canon-transls host)
1838     (canonicalize-logical-pathname-translations translations host))
1839     (setf (logical-host-translations host) translations)))
1840    
1841    
1842 phg 1.12 ;;; The search mechanism for loading pathname translations uses the CMUCL
1843     ;;; extension of search-lists. The user can add to the library: search-list
1844     ;;; using setf. The file for translations should have the name defined by
1845 phg 1.14 ;;; the hostname (a string) and with type component "translations".
1846 phg 1.12
1847 phg 1.13 ;;; LOAD-LOGICAL-PATHNAME-TRANSLATIONS -- Public
1848     ;;;
1849 pw 1.43 (defun load-logical-pathname-translations (host)
1850     "Search for a logical pathname named host, if not already defined. If already
1851     defined no attempt to find or load a definition is attempted and NIL is
1852     returned. If host is not already defined, but definition is found and loaded
1853     successfully, T is returned, else error."
1854     (declare (type string host)
1855     (values (member t nil)))
1856 pw 1.44 (let ((*autoload-translations* nil))
1857     (unless (or (string-equal host "library")
1858     (find-logical-host host nil))
1859     (with-open-file (in-str (make-pathname :defaults "library:"
1860     :name (string-downcase host)
1861     :type "translations"))
1862     (if *load-verbose*
1863     (format *error-output*
1864     ";; Loading pathname translations from ~A~%"
1865     (namestring (truename in-str))))
1866     (setf (logical-pathname-translations host) (read in-str)))
1867     t)))
1868 phg 1.12
1869 phg 1.13 ;;; TRANSLATE-LOGICAL-PATHNAME -- Public
1870     ;;;
1871 phg 1.12 (defun translate-logical-pathname (pathname &key)
1872     "Translates pathname to a physical pathname, which is returned."
1873 phg 1.16 (declare (type path-designator pathname)
1874     (values (or null pathname)))
1875 ram 1.17 (typecase pathname
1876     (logical-pathname
1877     (dolist (x (logical-host-canon-transls (%pathname-host pathname))
1878 dtc 1.34 (error 'simple-file-error
1879     :pathname pathname
1880     :format-control "No translation for ~S"
1881     :format-arguments (list pathname)))
1882 ram 1.17 (destructuring-bind (from to) x
1883     (when (pathname-match-p pathname from)
1884     (return (translate-logical-pathname
1885     (translate-pathname pathname from to)))))))
1886     (pathname pathname)
1887 ram 1.22 (stream (translate-logical-pathname (pathname pathname)))
1888 ram 1.17 (t (translate-logical-pathname (logical-pathname pathname)))))
1889 phg 1.12
1890 ram 1.17 (defvar *logical-pathname-defaults*
1891     (%make-logical-pathname (make-logical-host :name "BOGUS") :unspecific
1892     nil nil nil nil))

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