src/code/target-pathname.lisp

   1 ;;;; machine/filesystem-independent pathname functions
   2
   3 ;;;; This software is part of the SBCL system. See the README file for
   4 ;;;; more information.
   5 ;;;;
   6 ;;;; This software is derived from the CMU CL system, which was
   7 ;;;; written at Carnegie Mellon University and released into the
   8 ;;;; public domain. The software is in the public domain and is
   9 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
  10 ;;;; files for more information.
  11
  12 (in-package "SB!IMPL")
  13
  14 #!-sb-fluid (declaim (freeze-type logical-pathname logical-host))
  15 \f
  16 ;;;; PHYSICAL-HOST stuff
  17
  18 (def!struct (unix-host
  19              (:make-load-form-fun make-unix-host-load-form)
  20              (:include host
  21                        (parse #'parse-unix-namestring)
  22                        (parse-native #'parse-native-unix-namestring)
  23                        (unparse #'unparse-unix-namestring)
  24                        (unparse-native #'unparse-native-unix-namestring)
  25                        (unparse-host #'unparse-unix-host)
  26                        (unparse-directory #'unparse-unix-directory)
  27                        (unparse-file #'unparse-unix-file)
  28                        (unparse-enough #'unparse-unix-enough)
  29                        (unparse-directory-separator "/")
  30                        (simplify-namestring #'simplify-unix-namestring)
  31                        (customary-case :lower))))
  32 (defvar *unix-host* (make-unix-host))
  33 (defun make-unix-host-load-form (host)
  34   (declare (ignore host))
  35   '*unix-host*)
  36
  37 (def!struct (win32-host
  38              (:make-load-form-fun make-win32-host-load-form)
  39              (:include host
  40                        (parse #'parse-win32-namestring)
  41                        (parse-native #'parse-native-win32-namestring)
  42                        (unparse #'unparse-win32-namestring)
  43                        (unparse-native #'unparse-native-win32-namestring)
  44                        (unparse-host #'unparse-win32-host)
  45                        (unparse-directory #'unparse-win32-directory)
  46                        (unparse-file #'unparse-win32-file)
  47                        (unparse-enough #'unparse-win32-enough)
  48                        (unparse-directory-separator "\\")
  49                        (simplify-namestring #'simplify-win32-namestring)
  50                        (customary-case :upper))))
  51 (defparameter *win32-host* (make-win32-host))
  52 (defun make-win32-host-load-form (host)
  53   (declare (ignore host))
  54   '*win32-host*)
  55
  56 (defvar *physical-host*
  57   #!-win32 *unix-host*
  58   #!+win32 *win32-host*)
  59
  60 ;;; Return a value suitable, e.g., for preinitializing
  61 ;;; *DEFAULT-PATHNAME-DEFAULTS* before *DEFAULT-PATHNAME-DEFAULTS* is
  62 ;;; initialized (at which time we can't safely call e.g. #'PATHNAME).
  63 (defun make-trivial-default-pathname ()
  64   (%make-pathname *physical-host* nil nil nil nil :newest))
  65 \f
  66 ;;; pathname methods
  67
  68 (def!method print-object ((pathname pathname) stream)
  69   (let ((namestring (handler-case (namestring pathname)
  70                       (error nil))))
  71     (if namestring
  72         (format stream
  73                 (if (or *print-readably* *print-escape*)
  74                     "#P~S"
  75                     "~A")
  76                 (coerce namestring '(simple-array character (*))))
  77         (print-unreadable-object (pathname stream :type t)
  78           (format stream
  79                   "~@<(with no namestring) ~_:HOST ~S ~_:DEVICE ~S ~_:DIRECTORY ~S ~
  80                   ~_:NAME ~S ~_:TYPE ~S ~_:VERSION ~S~:>"
  81                   (%pathname-host pathname)
  82                   (%pathname-device pathname)
  83                   (%pathname-directory pathname)
  84                   (%pathname-name pathname)
  85                   (%pathname-type pathname)
  86                   (%pathname-version pathname))))))
  87
  88 (def!method make-load-form ((pathname pathname) &optional environment)
  89   (make-load-form-saving-slots pathname :environment environment))
  90 \f
  91 ;;; A pathname is logical if the host component is a logical host.
  92 ;;; This constructor is used to make an instance of the correct type
  93 ;;; from parsed arguments.
  94 (defun %make-maybe-logical-pathname (host device directory name type version)
  95   ;; We canonicalize logical pathname components to uppercase. ANSI
  96   ;; doesn't strictly require this, leaving it up to the implementor;
  97   ;; but the arguments given in the X3J13 cleanup issue
  98   ;; PATHNAME-LOGICAL:ADD seem compelling: we should canonicalize the
  99   ;; case, and uppercase is the ordinary way to do that.
 100   (flet ((upcase-maybe (x) (typecase x (string (logical-word-or-lose x)) (t x))))
 101     (if (typep host 'logical-host)
 102         (%make-logical-pathname host
 103                                 :unspecific
 104                                 (mapcar #'upcase-maybe directory)
 105                                 (upcase-maybe name)
 106                                 (upcase-maybe type)
 107                                 version)
 108         (progn
 109           (aver (eq host *physical-host*))
 110           (%make-pathname host device directory name type version)))))
 111
 112 ;;; Hash table searching maps a logical pathname's host to its
 113 ;;; physical pathname translation.
 114 (defvar *logical-hosts* (make-hash-table :test 'equal :synchronized t))
 115 \f
 116 ;;;; patterns
 117
 118 (def!method make-load-form ((pattern pattern) &optional environment)
 119   (make-load-form-saving-slots pattern :environment environment))
 120
 121 (def!method print-object ((pattern pattern) stream)
 122   (print-unreadable-object (pattern stream :type t)
 123     (if *print-pretty*
 124         (let ((*print-escape* t))
 125           (pprint-fill stream (pattern-pieces pattern) nil))
 126         (prin1 (pattern-pieces pattern) stream))))
 127
 128 (defun pattern= (pattern1 pattern2)
 129   (declare (type pattern pattern1 pattern2))
 130   (let ((pieces1 (pattern-pieces pattern1))
 131         (pieces2 (pattern-pieces pattern2)))
 132     (and (= (length pieces1) (length pieces2))
 133          (every (lambda (piece1 piece2)
 134                   (typecase piece1
 135                     (simple-string
 136                      (and (simple-string-p piece2)
 137                           (string= piece1 piece2)))
 138                     (cons
 139                      (and (consp piece2)
 140                           (eq (car piece1) (car piece2))
 141                           (string= (cdr piece1) (cdr piece2))))
 142                     (t
 143                      (eq piece1 piece2))))
 144                 pieces1
 145                 pieces2))))
 146
 147 ;;; If the string matches the pattern returns the multiple values T
 148 ;;; and a list of the matched strings.
 149 (defun pattern-matches (pattern string)
 150   (declare (type pattern pattern)
 151            (type simple-string string))
 152   (let ((len (length string)))
 153     (labels ((maybe-prepend (subs cur-sub chars)
 154                (if cur-sub
 155                    (let* ((len (length chars))
 156                           (new (make-string len))
 157                           (index len))
 158                      (dolist (char chars)
 159                        (setf (schar new (decf index)) char))
 160                      (cons new subs))
 161                    subs))
 162              (matches (pieces start subs cur-sub chars)
 163                (if (null pieces)
 164                    (if (= start len)
 165                        (values t (maybe-prepend subs cur-sub chars))
 166                        (values nil nil))
 167                    (let ((piece (car pieces)))
 168                      (etypecase piece
 169                        (simple-string
 170                         (let ((end (+ start (length piece))))
 171                           (and (<= end len)
 172                                (string= piece string
 173                                         :start2 start :end2 end)
 174                                (matches (cdr pieces) end
 175                                         (maybe-prepend subs cur-sub chars)
 176                                         nil nil))))
 177                        (list
 178                         (ecase (car piece)
 179                           (:character-set
 180                            (and (< start len)
 181                                 (let ((char (schar string start)))
 182                                   (if (find char (cdr piece) :test #'char=)
 183                                       (matches (cdr pieces) (1+ start) subs t
 184                                                (cons char chars))))))))
 185                        ((member :single-char-wild)
 186                         (and (< start len)
 187                              (matches (cdr pieces) (1+ start) subs t
 188                                       (cons (schar string start) chars))))
 189                        ((member :multi-char-wild)
 190                         (multiple-value-bind (won new-subs)
 191                             (matches (cdr pieces) start subs t chars)
 192                           (if won
 193                               (values t new-subs)
 194                               (and (< start len)
 195                                    (matches pieces (1+ start) subs t
 196                                             (cons (schar string start)
 197                                                   chars)))))))))))
 198       (multiple-value-bind (won subs)
 199           (matches (pattern-pieces pattern) 0 nil nil nil)
 200         (values won (reverse subs))))))
 201
 202 ;;; PATHNAME-MATCH-P for directory components
 203 (defun directory-components-match (thing wild)
 204   (or (eq thing wild)
 205       (eq wild :wild)
 206       ;; If THING has a null directory, assume that it matches
 207       ;; (:ABSOLUTE :WILD-INFERIORS) or (:RELATIVE :WILD-INFERIORS).
 208       (and (consp wild)
 209            (null thing)
 210            (member (first wild) '(:absolute :relative))
 211            (eq (second wild) :wild-inferiors))
 212       (and (consp wild)
 213            (let ((wild1 (first wild)))
 214              (if (eq wild1 :wild-inferiors)
 215                  (let ((wild-subdirs (rest wild)))
 216                    (or (null wild-subdirs)
 217                        (loop
 218                          (when (directory-components-match thing wild-subdirs)
 219                            (return t))
 220                          (pop thing)
 221                          (unless thing (return nil)))))
 222                  (and (consp thing)
 223                       (components-match (first thing) wild1)
 224                       (directory-components-match (rest thing)
 225                                                   (rest wild))))))))
 226
 227 ;;; Return true if pathname component THING is matched by WILD. (not
 228 ;;; commutative)
 229 (defun components-match (thing wild)
 230   (declare (type (or pattern symbol simple-string integer) thing wild))
 231   (or (eq thing wild)
 232       (eq wild :wild)
 233       (typecase thing
 234         (simple-string
 235          ;; String is matched by itself, a matching pattern or :WILD.
 236          (typecase wild
 237            (pattern
 238             (values (pattern-matches wild thing)))
 239            (simple-string
 240             (string= thing wild))))
 241         (pattern
 242          ;; A pattern is only matched by an identical pattern.
 243          (and (pattern-p wild) (pattern= thing wild)))
 244         (integer
 245          ;; An integer (version number) is matched by :WILD or the
 246          ;; same integer. This branch will actually always be NIL as
 247          ;; long as the version is a fixnum.
 248          (eql thing wild)))))
 249
 250 ;;; a predicate for comparing two pathname slot component sub-entries
 251 (defun compare-component (this that)
 252   (or (eql this that)
 253       (typecase this
 254         (simple-string
 255          (and (simple-string-p that)
 256               (string= this that)))
 257         (pattern
 258          (and (pattern-p that)
 259               (pattern= this that)))
 260         (cons
 261          (and (consp that)
 262               (compare-component (car this) (car that))
 263               (compare-component (cdr this) (cdr that)))))))
 264 \f
 265 ;;;; pathname functions
 266
 267 (defun pathname= (pathname1 pathname2)
 268   (declare (type pathname pathname1)
 269            (type pathname pathname2))
 270   (and (eq (%pathname-host pathname1)
 271            (%pathname-host pathname2))
 272        (compare-component (%pathname-device pathname1)
 273                           (%pathname-device pathname2))
 274        (compare-component (%pathname-directory pathname1)
 275                           (%pathname-directory pathname2))
 276        (compare-component (%pathname-name pathname1)
 277                           (%pathname-name pathname2))
 278        (compare-component (%pathname-type pathname1)
 279                           (%pathname-type pathname2))
 280        (or (eq (%pathname-host pathname1) *unix-host*)
 281            (compare-component (%pathname-version pathname1)
 282                               (%pathname-version pathname2)))))
 283
 284 ;;; Convert PATHNAME-DESIGNATOR (a pathname, or string, or
 285 ;;; stream), into a pathname in pathname.
 286 ;;;
 287 ;;; FIXME: was rewritten, should be tested (or rewritten again, this
 288 ;;; time using ONCE-ONLY, *then* tested)
 289 ;;; FIXME: become SB!XC:DEFMACRO inside EVAL-WHEN (COMPILE EVAL)?
 290 (defmacro with-pathname ((pathname pathname-designator) &body body)
 291   (let ((pd0 (gensym)))
 292     `(let* ((,pd0 ,pathname-designator)
 293             (,pathname (etypecase ,pd0
 294                          (pathname ,pd0)
 295                          (string (parse-namestring ,pd0))
 296                          (file-stream (file-name ,pd0)))))
 297        ,@body)))
 298
 299 (defmacro with-native-pathname ((pathname pathname-designator) &body body)
 300   (let ((pd0 (gensym)))
 301     `(let* ((,pd0 ,pathname-designator)
 302             (,pathname (etypecase ,pd0
 303                          (pathname ,pd0)
 304                          (string (parse-native-namestring ,pd0))
 305                          ;; FIXME
 306                          #+nil
 307                          (file-stream (file-name ,pd0)))))
 308        ,@body)))
 309
 310 (defmacro with-host ((host host-designator) &body body)
 311   ;; Generally, redundant specification of information in software,
 312   ;; whether in code or in comments, is bad. However, the ANSI spec
 313   ;; for this is messy enough that it's hard to hold in short-term
 314   ;; memory, so I've recorded these redundant notes on the
 315   ;; implications of the ANSI spec.
 316   ;;
 317   ;; According to the ANSI spec, HOST can be a valid pathname host, or
 318   ;; a logical host, or NIL.
 319   ;;
 320   ;; A valid pathname host can be a valid physical pathname host or a
 321   ;; valid logical pathname host.
 322   ;;
 323   ;; A valid physical pathname host is "any of a string, a list of
 324   ;; strings, or the symbol :UNSPECIFIC, that is recognized by the
 325   ;; implementation as the name of a host". In SBCL as of 0.6.9.8,
 326   ;; that means :UNSPECIFIC: though someday we might want to
 327   ;; generalize it to allow strings like "RTFM.MIT.EDU" or lists like
 328   ;; '("RTFM" "MIT" "EDU"), that's not supported now.
 329   ;;
 330   ;; A valid logical pathname host is a string which has been defined as
 331   ;; the name of a logical host, as with LOAD-LOGICAL-PATHNAME-TRANSLATIONS.
 332   ;;
 333   ;; A logical host is an object of implementation-dependent nature. In
 334   ;; SBCL, it's a member of the HOST class (a subclass of STRUCTURE-OBJECT).
 335   (let ((hd0 (gensym)))
 336     `(let* ((,hd0 ,host-designator)
 337             (,host (etypecase ,hd0
 338                      ((string 0)
 339                       ;; This is a special host. It's not valid as a
 340                       ;; logical host, so it is a sensible thing to
 341                       ;; designate the physical host object. So we do
 342                       ;; that.
 343                       *physical-host*)
 344                      (string
 345                       ;; In general ANSI-compliant Common Lisps, a
 346                       ;; string might also be a physical pathname
 347                       ;; host, but ANSI leaves this up to the
 348                       ;; implementor, and in SBCL we don't do it, so
 349                       ;; it must be a logical host.
 350                       (find-logical-host ,hd0))
 351                      ((or null (member :unspecific))
 352                       ;; CLHS says that HOST=:UNSPECIFIC has
 353                       ;; implementation-defined behavior. We
 354                       ;; just turn it into NIL.
 355                       nil)
 356                      (list
 357                       ;; ANSI also allows LISTs to designate hosts,
 358                       ;; but leaves its interpretation
 359                       ;; implementation-defined. Our interpretation
 360                       ;; is that it's unsupported.:-|
 361                       (error "A LIST representing a pathname host is not ~
 362                               supported in this implementation:~%  ~S"
 363                              ,hd0))
 364                      (host ,hd0))))
 365       ,@body)))
 366
 367 (defun find-host (host-designator &optional (errorp t))
 368   (with-host (host host-designator)
 369     (when (and errorp (not host))
 370       (error "Couldn't find host: ~S" host-designator))
 371     host))
 372
 373 (defun pathname (pathspec)
 374   #!+sb-doc
 375   "Convert PATHSPEC (a pathname designator) into a pathname."
 376   (declare (type pathname-designator pathspec))
 377   (with-pathname (pathname pathspec)
 378     pathname))
 379
 380 (defun native-pathname (pathspec)
 381   #!+sb-doc
 382   "Convert PATHSPEC (a pathname designator) into a pathname, assuming
 383 the operating system native pathname conventions."
 384   (with-native-pathname (pathname pathspec)
 385     pathname))
 386
 387 ;;; Change the case of thing if DIDDLE-P.
 388 (defun maybe-diddle-case (thing diddle-p)
 389   (if (and diddle-p (not (or (symbolp thing) (integerp thing))))
 390       (labels ((check-for (pred in)
 391                  (typecase in
 392                    (pattern
 393                     (dolist (piece (pattern-pieces in))
 394                       (when (typecase piece
 395                               (simple-string
 396                                (check-for pred piece))
 397                               (cons
 398                                (case (car piece)
 399                                  (:character-set
 400                                   (check-for pred (cdr piece))))))
 401                         (return t))))
 402                    (list
 403                     (dolist (x in)
 404                       (when (check-for pred x)
 405                         (return t))))
 406                    (simple-string
 407                     (dotimes (i (length in))
 408                       (when (funcall pred (schar in i))
 409                         (return t))))
 410                    (t nil)))
 411                (diddle-with (fun thing)
 412                  (typecase thing
 413                    (pattern
 414                     (make-pattern
 415                      (mapcar (lambda (piece)
 416                                (typecase piece
 417                                  (simple-string
 418                                   (funcall fun piece))
 419                                  (cons
 420                                   (case (car piece)
 421                                     (:character-set
 422                                      (cons :character-set
 423                                            (funcall fun (cdr piece))))
 424                                     (t
 425                                      piece)))
 426                                  (t
 427                                   piece)))
 428                              (pattern-pieces thing))))
 429                    (list
 430                     (mapcar fun thing))
 431                    (simple-string
 432                     (funcall fun thing))
 433                    (t
 434                     thing))))
 435         (let ((any-uppers (check-for #'upper-case-p thing))
 436               (any-lowers (check-for #'lower-case-p thing)))
 437           (cond ((and any-uppers any-lowers)
 438                  ;; mixed case, stays the same
 439                  thing)
 440                 (any-uppers
 441                  ;; all uppercase, becomes all lower case
 442                  (diddle-with (lambda (x) (if (stringp x)
 443                                               (string-downcase x)
 444                                               x)) thing))
 445                 (any-lowers
 446                  ;; all lowercase, becomes all upper case
 447                  (diddle-with (lambda (x) (if (stringp x)
 448                                               (string-upcase x)
 449                                               x)) thing))
 450                 (t
 451                  ;; no letters?  I guess just leave it.
 452                  thing))))
 453       thing))
 454
 455 (defun merge-directories (dir1 dir2 diddle-case)
 456   (if (or (eq (car dir1) :absolute)
 457           (null dir2))
 458       dir1
 459       (let ((results nil))
 460         (flet ((add (dir)
 461                  (if (and (eq dir :back)
 462                           results
 463                           (not (member (car results)
 464                                        '(:back :wild-inferiors :relative :absolute))))
 465                      (pop results)
 466                      (push dir results))))
 467           (dolist (dir (maybe-diddle-case dir2 diddle-case))
 468             (add dir))
 469           (dolist (dir (cdr dir1))
 470             (add dir)))
 471         (reverse results))))
 472
 473 (defun merge-pathnames (pathname
 474                         &optional
 475                         (defaults *default-pathname-defaults*)
 476                         (default-version :newest))
 477   #!+sb-doc
 478   "Construct a filled in pathname by completing the unspecified components
 479    from the defaults."
 480   (declare (type pathname-designator pathname)
 481            (type pathname-designator defaults)
 482            (values pathname))
 483   (with-pathname (defaults defaults)
 484     (let ((pathname (let ((*default-pathname-defaults* defaults))
 485                       (pathname pathname))))
 486       (let* ((default-host (%pathname-host defaults))
 487              (pathname-host (%pathname-host pathname))
 488              (diddle-case
 489               (and default-host pathname-host
 490                    (not (eq (host-customary-case default-host)
 491                             (host-customary-case pathname-host))))))
 492         (%make-maybe-logical-pathname
 493          (or pathname-host default-host)
 494          (or (%pathname-device pathname)
 495              (maybe-diddle-case (%pathname-device defaults)
 496                                 diddle-case))
 497          (merge-directories (%pathname-directory pathname)
 498                             (%pathname-directory defaults)
 499                             diddle-case)
 500          (or (%pathname-name pathname)
 501              (maybe-diddle-case (%pathname-name defaults)
 502                                 diddle-case))
 503          (or (%pathname-type pathname)
 504              (maybe-diddle-case (%pathname-type defaults)
 505                                 diddle-case))
 506          (or (%pathname-version pathname)
 507              (and (not (%pathname-name pathname)) (%pathname-version defaults))
 508              default-version))))))
 509
 510 (defun import-directory (directory diddle-case)
 511   (etypecase directory
 512     (null nil)
 513     ((member :wild) '(:absolute :wild-inferiors))
 514     ((member :unspecific) '(:relative))
 515     (list
 516      (collect ((results))
 517        (results (pop directory))
 518        (dolist (piece directory)
 519          (cond ((member piece '(:wild :wild-inferiors :up :back))
 520                 (results piece))
 521                ((or (simple-string-p piece) (pattern-p piece))
 522                 (results (maybe-diddle-case piece diddle-case)))
 523                ((stringp piece)
 524                 (results (maybe-diddle-case (coerce piece 'simple-string)
 525                                             diddle-case)))
 526                (t
 527                 (error "~S is not allowed as a directory component." piece))))
 528        (results)))
 529     (simple-string
 530      `(:absolute ,(maybe-diddle-case directory diddle-case)))
 531     (string
 532      `(:absolute
 533        ,(maybe-diddle-case (coerce directory 'simple-string) diddle-case)))))
 534
 535 (defun make-pathname (&key host
 536                            (device nil devp)
 537                            (directory nil dirp)
 538                            (name nil namep)
 539                            (type nil typep)
 540                            (version nil versionp)
 541                            defaults
 542                            (case :local))
 543   #!+sb-doc
 544   "Makes a new pathname from the component arguments. Note that host is
 545 a host-structure or string."
 546   (declare (type (or string host pathname-component-tokens) host)
 547            (type (or string pathname-component-tokens) device)
 548            (type (or list string pattern pathname-component-tokens) directory)
 549            (type (or string pattern pathname-component-tokens) name type)
 550            (type (or integer pathname-component-tokens (member :newest))
 551                  version)
 552            (type (or pathname-designator null) defaults)
 553            (type (member :common :local) case))
 554   (let* ((defaults (when defaults
 555                      (with-pathname (defaults defaults) defaults)))
 556          (default-host (if defaults
 557                            (%pathname-host defaults)
 558                            (pathname-host *default-pathname-defaults*)))
 559          ;; Raymond Toy writes: CLHS says make-pathname can take a
 560          ;; string (as a logical-host) for the host part. We map that
 561          ;; string into the corresponding logical host structure.
 562          ;;
 563          ;; Paul Werkowski writes:
 564          ;; HyperSpec says for the arg to MAKE-PATHNAME;
 565          ;; "host---a valid physical pathname host. ..."
 566          ;; where it probably means -- a valid pathname host.
 567          ;; "valid pathname host n. a valid physical pathname host or
 568          ;; a valid logical pathname host."
 569          ;; and defines
 570          ;; "valid physical pathname host n. any of a string,
 571          ;; a list of strings, or the symbol :unspecific,
 572          ;; that is recognized by the implementation as the name of a host."
 573          ;; "valid logical pathname host n. a string that has been defined
 574          ;; as the name of a logical host. ..."
 575          ;; HS is silent on what happens if the :HOST arg is NOT one of these.
 576          ;; It seems an error message is appropriate.
 577          (host (or (find-host host nil) default-host))
 578          (diddle-args (and (eq (host-customary-case host) :lower)
 579                            (eq case :common)))
 580          (diddle-defaults
 581           (not (eq (host-customary-case host)
 582                    (host-customary-case default-host))))
 583          (dev (if devp device (if defaults (%pathname-device defaults))))
 584          (dir (import-directory directory diddle-args))
 585          (ver (cond
 586                (versionp version)
 587                (defaults (%pathname-version defaults))
 588                (t nil))))
 589     (when (and defaults (not dirp))
 590       (setf dir
 591             (merge-directories dir
 592                                (%pathname-directory defaults)
 593                                diddle-defaults)))
 594
 595     (macrolet ((pick (var varp field)
 596                  `(cond ((or (simple-string-p ,var)
 597                              (pattern-p ,var))
 598                          (maybe-diddle-case ,var diddle-args))
 599                         ((stringp ,var)
 600                          (maybe-diddle-case (coerce ,var 'simple-string)
 601                                             diddle-args))
 602                         (,varp
 603                          (maybe-diddle-case ,var diddle-args))
 604                         (defaults
 605                          (maybe-diddle-case (,field defaults)
 606                                             diddle-defaults))
 607                         (t
 608                          nil))))
 609       (%make-maybe-logical-pathname host
 610                                     dev ; forced to :UNSPECIFIC when logical
 611                                     dir
 612                                     (pick name namep %pathname-name)
 613                                     (pick type typep %pathname-type)
 614                                     ver))))
 615
 616 (defun pathname-host (pathname &key (case :local))
 617   #!+sb-doc
 618   "Return PATHNAME's host."
 619   (declare (type pathname-designator pathname)
 620            (type (member :local :common) case)
 621            (values host)
 622            (ignore case))
 623   (with-pathname (pathname pathname)
 624     (%pathname-host pathname)))
 625
 626 (defun pathname-device (pathname &key (case :local))
 627   #!+sb-doc
 628   "Return PATHNAME's device."
 629   (declare (type pathname-designator pathname)
 630            (type (member :local :common) case))
 631   (with-pathname (pathname pathname)
 632     (maybe-diddle-case (%pathname-device pathname)
 633                        (and (eq case :common)
 634                             (eq (host-customary-case
 635                                  (%pathname-host pathname))
 636                                 :lower)))))
 637
 638 (defun pathname-directory (pathname &key (case :local))
 639   #!+sb-doc
 640   "Return PATHNAME's directory."
 641   (declare (type pathname-designator pathname)
 642            (type (member :local :common) case))
 643   (with-pathname (pathname pathname)
 644     (maybe-diddle-case (%pathname-directory pathname)
 645                        (and (eq case :common)
 646                             (eq (host-customary-case
 647                                  (%pathname-host pathname))
 648                                 :lower)))))
 649 (defun pathname-name (pathname &key (case :local))
 650   #!+sb-doc
 651   "Return PATHNAME's name."
 652   (declare (type pathname-designator pathname)
 653            (type (member :local :common) case))
 654   (with-pathname (pathname pathname)
 655     (maybe-diddle-case (%pathname-name pathname)
 656                        (and (eq case :common)
 657                             (eq (host-customary-case
 658                                  (%pathname-host pathname))
 659                                 :lower)))))
 660
 661 (defun pathname-type (pathname &key (case :local))
 662   #!+sb-doc
 663   "Return PATHNAME's type."
 664   (declare (type pathname-designator pathname)
 665            (type (member :local :common) case))
 666   (with-pathname (pathname pathname)
 667     (maybe-diddle-case (%pathname-type pathname)
 668                        (and (eq case :common)
 669                             (eq (host-customary-case
 670                                  (%pathname-host pathname))
 671                                 :lower)))))
 672
 673 (defun pathname-version (pathname)
 674   #!+sb-doc
 675   "Return PATHNAME's version."
 676   (declare (type pathname-designator pathname))
 677   (with-pathname (pathname pathname)
 678     (%pathname-version pathname)))
 679 \f
 680 ;;;; namestrings
 681
 682 ;;; Handle the case for PARSE-NAMESTRING parsing a potentially
 683 ;;; syntactically valid logical namestring with an explicit host.
 684 ;;;
 685 ;;; This then isn't fully general -- we are relying on the fact that
 686 ;;; we will only pass to parse-namestring namestring with an explicit
 687 ;;; logical host, so that we can pass the host return from
 688 ;;; parse-logical-namestring through to %PARSE-NAMESTRING as a truth
 689 ;;; value. Yeah, this is probably a KLUDGE - CSR, 2002-04-18
 690 (defun parseable-logical-namestring-p (namestr start end)
 691   (catch 'exit
 692     (handler-bind
 693         ((namestring-parse-error (lambda (c)
 694                                    (declare (ignore c))
 695                                    (throw 'exit nil))))
 696       (let ((colon (position #\: namestr :start start :end end)))
 697         (when colon
 698           (let ((potential-host
 699                  (logical-word-or-lose (subseq namestr start colon))))
 700             ;; depending on the outcome of CSR comp.lang.lisp post
 701             ;; "can PARSE-NAMESTRING create logical hosts", we may need
 702             ;; to do things with potential-host (create it
 703             ;; temporarily, parse the namestring and unintern the
 704             ;; logical host potential-host on failure.
 705             (declare (ignore potential-host))
 706             (let ((result
 707                    (handler-bind
 708                        ((simple-type-error (lambda (c)
 709                                              (declare (ignore c))
 710                                              (throw 'exit nil))))
 711                      (parse-logical-namestring namestr start end))))
 712               ;; if we got this far, we should have an explicit host
 713               ;; (first return value of parse-logical-namestring)
 714               (aver result)
 715               result)))))))
 716
 717 ;;; Handle the case where PARSE-NAMESTRING is actually parsing a
 718 ;;; namestring. We pick off the :JUNK-ALLOWED case then find a host to
 719 ;;; use for parsing, call the parser, then check whether the host matches.
 720 (defun %parse-namestring (namestr host defaults start end junk-allowed)
 721   (declare (type (or host null) host)
 722            (type string namestr)
 723            (type index start)
 724            (type (or index null) end))
 725   (cond
 726     (junk-allowed
 727      (handler-case
 728          (%parse-namestring namestr host defaults start end nil)
 729        (namestring-parse-error (condition)
 730          (values nil (namestring-parse-error-offset condition)))))
 731     (t
 732      (let* ((end (%check-vector-sequence-bounds namestr start end)))
 733        (multiple-value-bind (new-host device directory file type version)
 734            ;; Comments below are quotes from the HyperSpec
 735            ;; PARSE-NAMESTRING entry, reproduced here to demonstrate
 736            ;; that we actually have to do things this way rather than
 737            ;; some possibly more logical way. - CSR, 2002-04-18
 738            (cond
 739              ;; "If host is a logical host then thing is parsed as a
 740              ;; logical pathname namestring on the host."
 741              (host (funcall (host-parse host) namestr start end))
 742              ;; "If host is nil and thing is a syntactically valid
 743              ;; logical pathname namestring containing an explicit
 744              ;; host, then it is parsed as a logical pathname
 745              ;; namestring."
 746              ((parseable-logical-namestring-p namestr start end)
 747               (parse-logical-namestring namestr start end))
 748              ;; "If host is nil, default-pathname is a logical
 749              ;; pathname, and thing is a syntactically valid logical
 750              ;; pathname namestring without an explicit host, then it
 751              ;; is parsed as a logical pathname namestring on the
 752              ;; host that is the host component of default-pathname."
 753              ;;
 754              ;; "Otherwise, the parsing of thing is
 755              ;; implementation-defined."
 756              ;;
 757              ;; Both clauses are handled here, as the default
 758              ;; *DEFAULT-PATHNAME-DEFAULTS* has a SB-IMPL::UNIX-HOST
 759              ;; for a host.
 760              ((pathname-host defaults)
 761               (funcall (host-parse (pathname-host defaults))
 762                        namestr
 763                        start
 764                        end))
 765              ;; I don't think we should ever get here, as the default
 766              ;; host will always have a non-null HOST, given that we
 767              ;; can't create a new pathname without going through
 768              ;; *DEFAULT-PATHNAME-DEFAULTS*, which has a non-null
 769              ;; host...
 770              (t (bug "Fallen through COND in %PARSE-NAMESTRING")))
 771          (when (and host new-host (not (eq new-host host)))
 772            (error 'simple-type-error
 773                   :datum new-host
 774                   ;; Note: ANSI requires that this be a TYPE-ERROR,
 775                   ;; but there seems to be no completely correct
 776                   ;; value to use for TYPE-ERROR-EXPECTED-TYPE.
 777                   ;; Instead, we return a sort of "type error allowed
 778                   ;; type", trying to say "it would be OK if you
 779                   ;; passed NIL as the host value" but not mentioning
 780                   ;; that a matching string would be OK too.
 781                   :expected-type 'null
 782                   :format-control
 783                   "The host in the namestring, ~S,~@
 784                    does not match the explicit HOST argument, ~S."
 785                   :format-arguments (list new-host host)))
 786          (let ((pn-host (or new-host host (pathname-host defaults))))
 787            (values (%make-maybe-logical-pathname
 788                     pn-host device directory file type version)
 789                    end)))))))
 790
 791 ;;; If NAMESTR begins with a colon-terminated, defined, logical host,
 792 ;;; then return that host, otherwise return NIL.
 793 (defun extract-logical-host-prefix (namestr start end)
 794   (declare (type simple-string namestr)
 795            (type index start end)
 796            (values (or logical-host null)))
 797   (let ((colon-pos (position #\: namestr :start start :end end)))
 798     (if colon-pos
 799         (values (gethash (nstring-upcase (subseq namestr start colon-pos))
 800                          *logical-hosts*))
 801         nil)))
 802
 803 (defun parse-namestring (thing
 804                          &optional
 805                          host
 806                          (defaults *default-pathname-defaults*)
 807                          &key (start 0) end junk-allowed)
 808   (declare (type pathname-designator thing defaults)
 809            (type (or list host string (member :unspecific)) host)
 810            (type index start)
 811            (type (or index null) end)
 812            (type (or t null) junk-allowed)
 813            (values (or null pathname) (or null index)))
 814   (with-host (found-host host)
 815     (let (;; According to ANSI defaults may be any valid pathname designator
 816           (defaults (etypecase defaults
 817                       (pathname
 818                        defaults)
 819                       (string
 820                        (aver (pathnamep *default-pathname-defaults*))
 821                        (parse-namestring defaults))
 822                       (stream
 823                        (truename defaults)))))
 824       (declare (type pathname defaults))
 825       (etypecase thing
 826         (simple-string
 827          (%parse-namestring thing found-host defaults start end junk-allowed))
 828         (string
 829          (%parse-namestring (coerce thing 'simple-string)
 830                             found-host defaults start end junk-allowed))
 831         (pathname
 832          (let ((defaulted-host (or found-host (%pathname-host defaults))))
 833            (declare (type host defaulted-host))
 834            (unless (eq defaulted-host (%pathname-host thing))
 835              (error "The HOST argument doesn't match the pathname host:~%  ~
 836                     ~S and ~S."
 837                     defaulted-host (%pathname-host thing))))
 838          (values thing start))
 839         (stream
 840          (let ((name (file-name thing)))
 841            (unless name
 842              (error "can't figure out the file associated with stream:~%  ~S"
 843                     thing))
 844            (values name nil)))))))
 845
 846 (defun %parse-native-namestring (namestr host defaults start end junk-allowed)
 847   (declare (type (or host null) host)
 848            (type string namestr)
 849            (type index start)
 850            (type (or index null) end))
 851   (cond
 852     (junk-allowed
 853      (handler-case
 854          (%parse-namestring namestr host defaults start end nil)
 855        (namestring-parse-error (condition)
 856          (values nil (namestring-parse-error-offset condition)))))
 857     (t
 858      (let* ((end (%check-vector-sequence-bounds namestr start end)))
 859        (multiple-value-bind (new-host device directory file type version)
 860            (cond
 861              (host
 862               (funcall (host-parse-native host) namestr start end))
 863              ((pathname-host defaults)
 864               (funcall (host-parse-native (pathname-host defaults))
 865                        namestr
 866                        start
 867                        end))
 868              ;; I don't think we should ever get here, as the default
 869              ;; host will always have a non-null HOST, given that we
 870              ;; can't create a new pathname without going through
 871              ;; *DEFAULT-PATHNAME-DEFAULTS*, which has a non-null
 872              ;; host...
 873              (t (bug "Fallen through COND in %PARSE-NAMESTRING")))
 874          (when (and host new-host (not (eq new-host host)))
 875            (error 'simple-type-error
 876                   :datum new-host
 877                   :expected-type `(or null (eql ,host))
 878                   :format-control
 879                   "The host in the namestring, ~S,~@
 880                    does not match the explicit HOST argument, ~S."
 881                   :format-arguments (list new-host host)))
 882          (let ((pn-host (or new-host host (pathname-host defaults))))
 883            (values (%make-pathname
 884                     pn-host device directory file type version)
 885                    end)))))))
 886
 887 (defun parse-native-namestring (thing
 888                                 &optional
 889                                 host
 890                                 (defaults *default-pathname-defaults*)
 891                                 &key (start 0) end junk-allowed)
 892   #!+sb-doc
 893   "Convert THING into a pathname, using the native conventions
 894 appropriate for the pathname host HOST, or if not specified the host
 895 of DEFAULTS.  If THING is a string, the parse is bounded by START and
 896 END, and error behaviour is controlled by JUNK-ALLOWED, as with
 897 PARSE-NAMESTRING."
 898   (declare (type pathname-designator thing defaults)
 899            (type (or list host string (member :unspecific)) host)
 900            (type index start)
 901            (type (or index null) end)
 902            (type (or t null) junk-allowed)
 903            (values (or null pathname) (or null index)))
 904   (with-host (found-host host)
 905     (let ((defaults (etypecase defaults
 906                       (pathname
 907                        defaults)
 908                       (string
 909                        (aver (pathnamep *default-pathname-defaults*))
 910                        (parse-native-namestring defaults))
 911                       (stream
 912                        (truename defaults)))))
 913       (declare (type pathname defaults))
 914       (etypecase thing
 915         (simple-string
 916          (%parse-native-namestring
 917           thing found-host defaults start end junk-allowed))
 918         (string
 919          (%parse-native-namestring (coerce thing 'simple-string)
 920                                    found-host defaults start end junk-allowed))
 921         (pathname
 922          (let ((defaulted-host (or found-host (%pathname-host defaults))))
 923            (declare (type host defaulted-host))
 924            (unless (eq defaulted-host (%pathname-host thing))
 925              (error "The HOST argument doesn't match the pathname host:~%  ~
 926                      ~S and ~S."
 927                     defaulted-host (%pathname-host thing))))
 928          (values thing start))
 929         (stream
 930          ;; FIXME
 931          (let ((name (file-name thing)))
 932            (unless name
 933              (error "can't figure out the file associated with stream:~%  ~S"
 934                     thing))
 935            (values name nil)))))))
 936
 937 (defun namestring (pathname)
 938   #!+sb-doc
 939   "Construct the full (name)string form of the pathname."
 940   (declare (type pathname-designator pathname))
 941   (with-pathname (pathname pathname)
 942     (when pathname
 943       (let ((host (%pathname-host pathname)))
 944         (unless host
 945           (error "can't determine the namestring for pathnames with no ~
 946                   host:~%  ~S" pathname))
 947         (funcall (host-unparse host) pathname)))))
 948
 949 (defun native-namestring (pathname)
 950   #!+sb-doc
 951   "Construct the full native (name)string form of PATHNAME."
 952   (declare (type pathname-designator pathname))
 953   (with-native-pathname (pathname pathname)
 954     (when pathname
 955       (let ((host (%pathname-host pathname)))
 956         (unless host
 957           (error "can't determine the native namestring for pathnames with no ~
 958                   host:~%  ~S" pathname))
 959         (funcall (host-unparse-native host) pathname)))))
 960
 961 (defun host-namestring (pathname)
 962   #!+sb-doc
 963   "Return a string representation of the name of the host in the pathname."
 964   (declare (type pathname-designator pathname))
 965   (with-pathname (pathname pathname)
 966     (let ((host (%pathname-host pathname)))
 967       (if host
 968           (funcall (host-unparse-host host) pathname)
 969           (error
 970            "can't determine the namestring for pathnames with no host:~%  ~S"
 971            pathname)))))
 972
 973 (defun directory-namestring (pathname)
 974   #!+sb-doc
 975   "Return a string representation of the directories used in the pathname."
 976   (declare (type pathname-designator pathname))
 977   (with-pathname (pathname pathname)
 978     (let ((host (%pathname-host pathname)))
 979       (if host
 980           (funcall (host-unparse-directory host) pathname)
 981           (error
 982            "can't determine the namestring for pathnames with no host:~%  ~S"
 983            pathname)))))
 984
 985 (defun file-namestring (pathname)
 986   #!+sb-doc
 987   "Return a string representation of the name used in the pathname."
 988   (declare (type pathname-designator pathname))
 989   (with-pathname (pathname pathname)
 990     (let ((host (%pathname-host pathname)))
 991       (if host
 992           (funcall (host-unparse-file host) pathname)
 993           (error
 994            "can't determine the namestring for pathnames with no host:~%  ~S"
 995            pathname)))))
 996
 997 (defun enough-namestring (pathname
 998                           &optional
 999                           (defaults *default-pathname-defaults*))
1000   #!+sb-doc
1001   "Return an abbreviated pathname sufficent to identify the pathname relative
1002    to the defaults."
1003   (declare (type pathname-designator pathname))
1004   (with-pathname (pathname pathname)
1005     (let ((host (%pathname-host pathname)))
1006       (if host
1007           (with-pathname (defaults defaults)
1008             (funcall (host-unparse-enough host) pathname defaults))
1009           (error
1010            "can't determine the namestring for pathnames with no host:~%  ~S"
1011            pathname)))))
1012 \f
1013 ;;;; wild pathnames
1014
1015 (defun wild-pathname-p (pathname &optional field-key)
1016   #!+sb-doc
1017   "Predicate for determining whether pathname contains any wildcards."
1018   (declare (type pathname-designator pathname)
1019            (type (member nil :host :device :directory :name :type :version)
1020                  field-key))
1021   (with-pathname (pathname pathname)
1022     (flet ((frob (x)
1023              (or (pattern-p x) (member x '(:wild :wild-inferiors)))))
1024       (ecase field-key
1025         ((nil)
1026          (or (wild-pathname-p pathname :host)
1027              (wild-pathname-p pathname :device)
1028              (wild-pathname-p pathname :directory)
1029              (wild-pathname-p pathname :name)
1030              (wild-pathname-p pathname :type)
1031              (wild-pathname-p pathname :version)))
1032         (:host (frob (%pathname-host pathname)))
1033         (:device (frob (%pathname-host pathname)))
1034         (:directory (some #'frob (%pathname-directory pathname)))
1035         (:name (frob (%pathname-name pathname)))
1036         (:type (frob (%pathname-type pathname)))
1037         (:version (frob (%pathname-version pathname)))))))
1038
1039 (defun pathname-match-p (in-pathname in-wildname)
1040   #!+sb-doc
1041   "Pathname matches the wildname template?"
1042   (declare (type pathname-designator in-pathname))
1043   (with-pathname (pathname in-pathname)
1044     (with-pathname (wildname in-wildname)
1045       (macrolet ((frob (field &optional (op 'components-match))
1046                    `(or (null (,field wildname))
1047                         (,op (,field pathname) (,field wildname)))))
1048         (and (or (null (%pathname-host wildname))
1049                  (eq (%pathname-host wildname) (%pathname-host pathname)))
1050              (frob %pathname-device)
1051              (frob %pathname-directory directory-components-match)
1052              (frob %pathname-name)
1053              (frob %pathname-type)
1054              (or (eq (%pathname-host wildname) *unix-host*)
1055                  (frob %pathname-version)))))))
1056
1057 ;;; Place the substitutions into the pattern and return the string or pattern
1058 ;;; that results. If DIDDLE-CASE is true, we diddle the result case as well,
1059 ;;; in case we are translating between hosts with difference conventional case.
1060 ;;; The second value is the tail of subs with all of the values that we used up
1061 ;;; stripped off. Note that PATTERN-MATCHES matches all consecutive wildcards
1062 ;;; as a single string, so we ignore subsequent contiguous wildcards.
1063 (defun substitute-into (pattern subs diddle-case)
1064   (declare (type pattern pattern)
1065            (type list subs)
1066            (values (or simple-string pattern) list))
1067   (let ((in-wildcard nil)
1068         (pieces nil)
1069         (strings nil))
1070     (dolist (piece (pattern-pieces pattern))
1071       (cond ((simple-string-p piece)
1072              (push piece strings)
1073              (setf in-wildcard nil))
1074             (in-wildcard)
1075             (t
1076              (setf in-wildcard t)
1077              (unless subs
1078                (error "not enough wildcards in FROM pattern to match ~
1079                        TO pattern:~%  ~S"
1080                       pattern))
1081              (let ((sub (pop subs)))
1082                (typecase sub
1083                  (pattern
1084                   (when strings
1085                     (push (apply #'concatenate 'simple-string
1086                                  (nreverse strings))
1087                           pieces))
1088                   (dolist (piece (pattern-pieces sub))
1089                     (push piece pieces)))
1090                  (simple-string
1091                   (push sub strings))
1092                  (t
1093                   (error "can't substitute this into the middle of a word:~
1094                           ~%  ~S"
1095                          sub)))))))
1096
1097     (when strings
1098       (push (apply #'concatenate 'simple-string (nreverse strings))
1099             pieces))
1100     (values
1101      (maybe-diddle-case
1102       (if (and pieces (simple-string-p (car pieces)) (null (cdr pieces)))
1103           (car pieces)
1104           (make-pattern (nreverse pieces)))
1105       diddle-case)
1106      subs)))
1107
1108 ;;; Called when we can't see how source and from matched.
1109 (defun didnt-match-error (source from)
1110   (error "Pathname components from SOURCE and FROM args to TRANSLATE-PATHNAME~@
1111           did not match:~%  ~S ~S"
1112          source from))
1113
1114 ;;; Do TRANSLATE-COMPONENT for all components except host, directory
1115 ;;; and version.
1116 (defun translate-component (source from to diddle-case)
1117   (typecase to
1118     (pattern
1119      (typecase from
1120        (pattern
1121         (typecase source
1122           (pattern
1123            (if (pattern= from source)
1124                source
1125                (didnt-match-error source from)))
1126           (simple-string
1127            (multiple-value-bind (won subs) (pattern-matches from source)
1128              (if won
1129                  (values (substitute-into to subs diddle-case))
1130                  (didnt-match-error source from))))
1131           (t
1132            (maybe-diddle-case source diddle-case))))
1133        ((member :wild)
1134         (values (substitute-into to (list source) diddle-case)))
1135        (t
1136         (if (components-match source from)
1137             (maybe-diddle-case source diddle-case)
1138             (didnt-match-error source from)))))
1139     ((member nil :wild)
1140      (maybe-diddle-case source diddle-case))
1141     (t
1142      (if (components-match source from)
1143          to
1144          (didnt-match-error source from)))))
1145
1146 ;;; Return a list of all the things that we want to substitute into the TO
1147 ;;; pattern (the things matched by from on source.)  When From contains
1148 ;;; :WILD-INFERIORS, the result contains a sublist of the matched source
1149 ;;; subdirectories.
1150 (defun compute-directory-substitutions (orig-source orig-from)
1151   (let ((source orig-source)
1152         (from orig-from))
1153     (collect ((subs))
1154       (loop
1155         (unless source
1156           (unless (every (lambda (x) (eq x :wild-inferiors)) from)
1157             (didnt-match-error orig-source orig-from))
1158           (subs ())
1159           (return))
1160         (unless from (didnt-match-error orig-source orig-from))
1161         (let ((from-part (pop from))
1162               (source-part (pop source)))
1163           (typecase from-part
1164             (pattern
1165              (typecase source-part
1166                (pattern
1167                 (if (pattern= from-part source-part)
1168                     (subs source-part)
1169                     (didnt-match-error orig-source orig-from)))
1170                (simple-string
1171                 (multiple-value-bind (won new-subs)
1172                     (pattern-matches from-part source-part)
1173                   (if won
1174                       (dolist (sub new-subs)
1175                         (subs sub))
1176                       (didnt-match-error orig-source orig-from))))
1177                (t
1178                 (didnt-match-error orig-source orig-from))))
1179             ((member :wild)
1180              (subs source-part))
1181             ((member :wild-inferiors)
1182              (let ((remaining-source (cons source-part source)))
1183                (collect ((res))
1184                  (loop
1185                    (when (directory-components-match remaining-source from)
1186                      (return))
1187                    (unless remaining-source
1188                      (didnt-match-error orig-source orig-from))
1189                    (res (pop remaining-source)))
1190                  (subs (res))
1191                  (setq source remaining-source))))
1192             (simple-string
1193              (unless (and (simple-string-p source-part)
1194                           (string= from-part source-part))
1195                (didnt-match-error orig-source orig-from)))
1196             (t
1197              (didnt-match-error orig-source orig-from)))))
1198       (subs))))
1199
1200 ;;; This is called by TRANSLATE-PATHNAME on the directory components
1201 ;;; of its argument pathnames to produce the result directory
1202 ;;; component. If this leaves the directory NIL, we return the source
1203 ;;; directory. The :RELATIVE or :ABSOLUTE is taken from the source
1204 ;;; directory, except if TO is :ABSOLUTE, in which case the result
1205 ;;; will be :ABSOLUTE.
1206 (defun translate-directories (source from to diddle-case)
1207   (if (not (and source to from))
1208       (or (and to (null source) (remove :wild-inferiors to))
1209           (mapcar (lambda (x) (maybe-diddle-case x diddle-case)) source))
1210       (collect ((res))
1211                ;; If TO is :ABSOLUTE, the result should still be :ABSOLUTE.
1212                (res (if (eq (first to) :absolute)
1213                  :absolute
1214                  (first source)))
1215         (let ((subs-left (compute-directory-substitutions (rest source)
1216                                                           (rest from))))
1217           (dolist (to-part (rest to))
1218             (typecase to-part
1219               ((member :wild)
1220                (aver subs-left)
1221                (let ((match (pop subs-left)))
1222                  (when (listp match)
1223                    (error ":WILD-INFERIORS is not paired in from and to ~
1224                            patterns:~%  ~S ~S" from to))
1225                  (res (maybe-diddle-case match diddle-case))))
1226               ((member :wild-inferiors)
1227                (aver subs-left)
1228                (let ((match (pop subs-left)))
1229                  (unless (listp match)
1230                    (error ":WILD-INFERIORS not paired in from and to ~
1231                            patterns:~%  ~S ~S" from to))
1232                  (dolist (x match)
1233                    (res (maybe-diddle-case x diddle-case)))))
1234               (pattern
1235                (multiple-value-bind
1236                    (new new-subs-left)
1237                    (substitute-into to-part subs-left diddle-case)
1238                  (setf subs-left new-subs-left)
1239                  (res new)))
1240               (t (res to-part)))))
1241         (res))))
1242
1243 (defun translate-pathname (source from-wildname to-wildname &key)
1244   #!+sb-doc
1245   "Use the source pathname to translate the from-wildname's wild and
1246    unspecified elements into a completed to-pathname based on the to-wildname."
1247   (declare (type pathname-designator source from-wildname to-wildname))
1248   (with-pathname (source source)
1249     (with-pathname (from from-wildname)
1250       (with-pathname (to to-wildname)
1251           (let* ((source-host (%pathname-host source))
1252                  (from-host (%pathname-host from))
1253                  (to-host (%pathname-host to))
1254                  (diddle-case
1255                   (and source-host to-host
1256                        (not (eq (host-customary-case source-host)
1257                                 (host-customary-case to-host))))))
1258             (macrolet ((frob (field &optional (op 'translate-component))
1259                          `(let ((result (,op (,field source)
1260                                              (,field from)
1261                                              (,field to)
1262                                              diddle-case)))
1263                             (if (eq result :error)
1264                                 (error "~S doesn't match ~S." source from)
1265                                 result))))
1266               (%make-maybe-logical-pathname
1267                (or to-host source-host)
1268                (frob %pathname-device)
1269                (frob %pathname-directory translate-directories)
1270                (frob %pathname-name)
1271                (frob %pathname-type)
1272                (if (eq from-host *unix-host*)
1273                    (if (or (eq (%pathname-version to) :wild)
1274                            (eq (%pathname-version to) nil))
1275                        (%pathname-version source)
1276                        (%pathname-version to))
1277                    (frob %pathname-version)))))))))
1278 \f
1279 ;;;;  logical pathname support. ANSI 92-102 specification.
1280 ;;;;
1281 ;;;;  As logical-pathname translations are loaded they are
1282 ;;;;  canonicalized as patterns to enable rapid efficient translation
1283 ;;;;  into physical pathnames.
1284
1285 ;;;; utilities
1286
1287 (defun simplify-namestring (namestring &optional host)
1288   (funcall (host-simplify-namestring
1289             (or host
1290                 (pathname-host (sane-default-pathname-defaults))))
1291            namestring))
1292
1293 ;;; Canonicalize a logical pathname word by uppercasing it checking that it
1294 ;;; contains only legal characters.
1295 (defun logical-word-or-lose (word)
1296   (declare (string word))
1297   (when (string= word "")
1298     (error 'namestring-parse-error
1299            :complaint "Attempted to treat invalid logical hostname ~
1300                        as a logical host:~%  ~S"
1301            :args (list word)
1302            :namestring word :offset 0))
1303   (let ((word (string-upcase word)))
1304     (dotimes (i (length word))
1305       (let ((ch (schar word i)))
1306         (unless (and (typep ch 'standard-char)
1307                      (or (alpha-char-p ch) (digit-char-p ch) (char= ch #\-)))
1308           (error 'namestring-parse-error
1309                  :complaint "logical namestring character which ~
1310                              is not alphanumeric or hyphen:~%  ~S"
1311                  :args (list ch)
1312                  :namestring word :offset i))))
1313     (coerce word 'string))) ; why not simple-string?
1314
1315 ;;; Given a logical host or string, return a logical host. If ERROR-P
1316 ;;; is NIL, then return NIL when no such host exists.
1317 (defun find-logical-host (thing &optional (errorp t))
1318   (etypecase thing
1319     (string
1320      (let ((found (gethash (logical-word-or-lose thing)
1321                            *logical-hosts*)))
1322        (if (or found (not errorp))
1323            found
1324            ;; This is the error signalled from e.g.
1325            ;; LOGICAL-PATHNAME-TRANSLATIONS when host is not a defined
1326            ;; host, and ANSI specifies that that's a TYPE-ERROR.
1327            (error 'simple-type-error
1328                   :datum thing
1329                   ;; God only knows what ANSI expects us to use for
1330                   ;; the EXPECTED-TYPE here. Maybe this will be OK..
1331                   :expected-type
1332                   '(and string (satisfies logical-pathname-translations))
1333                   :format-control "logical host not yet defined: ~S"
1334                   :format-arguments (list thing)))))
1335     (logical-host thing)))
1336
1337 ;;; Given a logical host name or host, return a logical host, creating
1338 ;;; a new one if necessary.
1339 (defun intern-logical-host (thing)
1340   (declare (values logical-host))
1341   (with-locked-hash-table (*logical-hosts*)
1342     (or (find-logical-host thing nil)
1343         (let* ((name (logical-word-or-lose thing))
1344                (new (make-logical-host :name name)))
1345           (setf (gethash name *logical-hosts*) new)
1346           new))))
1347 \f
1348 ;;;; logical pathname parsing
1349
1350 ;;; Deal with multi-char wildcards in a logical pathname token.
1351 (defun maybe-make-logical-pattern (namestring chunks)
1352   (let ((chunk (caar chunks)))
1353     (collect ((pattern))
1354       (let ((last-pos 0)
1355             (len (length chunk)))
1356         (declare (fixnum last-pos))
1357         (loop
1358           (when (= last-pos len) (return))
1359           (let ((pos (or (position #\* chunk :start last-pos) len)))
1360             (if (= pos last-pos)
1361                 (when (pattern)
1362                   (error 'namestring-parse-error
1363                          :complaint "double asterisk inside of logical ~
1364                                      word: ~S"
1365                          :args (list chunk)
1366                          :namestring namestring
1367                          :offset (+ (cdar chunks) pos)))
1368                 (pattern (subseq chunk last-pos pos)))
1369             (if (= pos len)
1370                 (return)
1371                 (pattern :multi-char-wild))
1372             (setq last-pos (1+ pos)))))
1373         (aver (pattern))
1374         (if (cdr (pattern))
1375             (make-pattern (pattern))
1376             (let ((x (car (pattern))))
1377               (if (eq x :multi-char-wild)
1378                   :wild
1379                   x))))))
1380
1381 ;;; Return a list of conses where the CDR is the start position and
1382 ;;; the CAR is a string (token) or character (punctuation.)
1383 (defun logical-chunkify (namestr start end)
1384   (collect ((chunks))
1385     (do ((i start (1+ i))
1386          (prev 0))
1387         ((= i end)
1388          (when (> end prev)
1389             (chunks (cons (nstring-upcase (subseq namestr prev end)) prev))))
1390       (let ((ch (schar namestr i)))
1391         (unless (or (alpha-char-p ch) (digit-char-p ch)
1392                     (member ch '(#\- #\*)))
1393           (when (> i prev)
1394             (chunks (cons (nstring-upcase (subseq namestr prev i)) prev)))
1395           (setq prev (1+ i))
1396           (unless (member ch '(#\; #\: #\.))
1397             (error 'namestring-parse-error
1398                    :complaint "illegal character for logical pathname:~%  ~S"
1399                    :args (list ch)
1400                    :namestring namestr
1401                    :offset i))
1402           (chunks (cons ch i)))))
1403     (chunks)))
1404
1405 ;;; Break up a logical-namestring, always a string, into its
1406 ;;; constituent parts.
1407 (defun parse-logical-namestring (namestr start end)
1408   (declare (type simple-string namestr)
1409            (type index start end))
1410   (collect ((directory))
1411     (let ((host nil)
1412           (name nil)
1413           (type nil)
1414           (version nil))
1415       (labels ((expecting (what chunks)
1416                  (unless (and chunks (simple-string-p (caar chunks)))
1417                    (error 'namestring-parse-error
1418                           :complaint "expecting ~A, got ~:[nothing~;~S~]."
1419                           :args (list what (caar chunks) (caar chunks))
1420                           :namestring namestr
1421                           :offset (if chunks (cdar chunks) end)))
1422                  (caar chunks))
1423                (parse-host (chunks)
1424                  (case (caadr chunks)
1425                    (#\:
1426                     (setq host
1427                           (find-logical-host (expecting "a host name" chunks)))
1428                     (parse-relative (cddr chunks)))
1429                    (t
1430                     (parse-relative chunks))))
1431                (parse-relative (chunks)
1432                  (case (caar chunks)
1433                    (#\;
1434                     (directory :relative)
1435                     (parse-directory (cdr chunks)))
1436                    (t
1437                     (directory :absolute) ; Assumption! Maybe revoked later.
1438                     (parse-directory chunks))))
1439                (parse-directory (chunks)
1440                  (case (caadr chunks)
1441                    (#\;
1442                     (directory
1443                      (let ((res (expecting "a directory name" chunks)))
1444                        (cond ((string= res "..") :up)
1445                              ((string= res "**") :wild-inferiors)
1446                              (t
1447                               (maybe-make-logical-pattern namestr chunks)))))
1448                     (parse-directory (cddr chunks)))
1449                    (t
1450                     (parse-name chunks))))
1451                (parse-name (chunks)
1452                  (when chunks
1453                    (expecting "a file name" chunks)
1454                    (setq name (maybe-make-logical-pattern namestr chunks))
1455                    (expecting-dot (cdr chunks))))
1456                (expecting-dot (chunks)
1457                  (when chunks
1458                    (unless (eql (caar chunks) #\.)
1459                      (error 'namestring-parse-error
1460                             :complaint "expecting a dot, got ~S."
1461                             :args (list (caar chunks))
1462                             :namestring namestr
1463                             :offset (cdar chunks)))
1464                    (if type
1465                        (parse-version (cdr chunks))
1466                        (parse-type (cdr chunks)))))
1467                (parse-type (chunks)
1468                  (expecting "a file type" chunks)
1469                  (setq type (maybe-make-logical-pattern namestr chunks))
1470                  (expecting-dot (cdr chunks)))
1471                (parse-version (chunks)
1472                  (let ((str (expecting "a positive integer, * or NEWEST"
1473                                        chunks)))
1474                    (cond
1475                     ((string= str "*") (setq version :wild))
1476                     ((string= str "NEWEST") (setq version :newest))
1477                     (t
1478                      (multiple-value-bind (res pos)
1479                          (parse-integer str :junk-allowed t)
1480                        (unless (and res (plusp res))
1481                          (error 'namestring-parse-error
1482                                 :complaint "expected a positive integer, ~
1483                                             got ~S"
1484                                 :args (list str)
1485                                 :namestring namestr
1486                                 :offset (+ pos (cdar chunks))))
1487                        (setq version res)))))
1488                  (when (cdr chunks)
1489                    (error 'namestring-parse-error
1490                           :complaint "extra stuff after end of file name"
1491                           :namestring namestr
1492                           :offset (cdadr chunks)))))
1493         (parse-host (logical-chunkify namestr start end)))
1494       (values host :unspecific (directory) name type version))))
1495
1496 ;;; We can't initialize this yet because not all host methods are
1497 ;;; loaded yet.
1498 (defvar *logical-pathname-defaults*)
1499
1500 (defun logical-pathname (pathspec)
1501   #!+sb-doc
1502   "Converts the pathspec argument to a logical-pathname and returns it."
1503   (declare (type (or logical-pathname string stream) pathspec)
1504            (values logical-pathname))
1505   (if (typep pathspec 'logical-pathname)
1506       pathspec
1507       (let ((res (parse-namestring pathspec nil *logical-pathname-defaults*)))
1508         (when (eq (%pathname-host res)
1509                   (%pathname-host *logical-pathname-defaults*))
1510           (error "This logical namestring does not specify a host:~%  ~S"
1511                  pathspec))
1512         res)))
1513 \f
1514 ;;;; logical pathname unparsing
1515
1516 (defun unparse-logical-directory (pathname)
1517   (declare (type pathname pathname))
1518   (collect ((pieces))
1519     (let ((directory (%pathname-directory pathname)))
1520       (when directory
1521         (ecase (pop directory)
1522           (:absolute) ; nothing special
1523           (:relative (pieces ";")))
1524         (dolist (dir directory)
1525           (cond ((or (stringp dir) (pattern-p dir))
1526                  (pieces (unparse-logical-piece dir))
1527                  (pieces ";"))
1528                 ((eq dir :wild)
1529                  (pieces "*;"))
1530                 ((eq dir :wild-inferiors)
1531                  (pieces "**;"))
1532                 (t
1533                  (error "invalid directory component: ~S" dir))))))
1534     (apply #'concatenate 'simple-string (pieces))))
1535
1536 (defun unparse-logical-piece (thing)
1537   (etypecase thing
1538     ((member :wild) "*")
1539     (simple-string thing)
1540     (pattern
1541      (collect ((strings))
1542        (dolist (piece (pattern-pieces thing))
1543          (etypecase piece
1544            (simple-string (strings piece))
1545            (keyword
1546             (cond ((eq piece :wild-inferiors)
1547                    (strings "**"))
1548                   ((eq piece :multi-char-wild)
1549                    (strings "*"))
1550                   (t (error "invalid keyword: ~S" piece))))))
1551        (apply #'concatenate 'simple-string (strings))))))
1552
1553 (defun unparse-logical-file (pathname)
1554   (declare (type pathname pathname))
1555     (collect ((strings))
1556     (let* ((name (%pathname-name pathname))
1557            (type (%pathname-type pathname))
1558            (version (%pathname-version pathname))
1559            (type-supplied (not (or (null type) (eq type :unspecific))))
1560            (version-supplied (not (or (null version)
1561                                       (eq version :unspecific)))))
1562       (when name
1563         (when (and (null type)
1564                    (typep name 'string)
1565                    (position #\. name :start 1))
1566           (error "too many dots in the name: ~S" pathname))
1567         (strings (unparse-logical-piece name)))
1568       (when type-supplied
1569         (unless name
1570           (error "cannot specify the type without a file: ~S" pathname))
1571         (when (typep type 'string)
1572           (when (position #\. type)
1573             (error "type component can't have a #\. inside: ~S" pathname)))
1574         (strings ".")
1575         (strings (unparse-logical-piece type)))
1576       (when version-supplied
1577         (unless type-supplied
1578           (error "cannot specify the version without a type: ~S" pathname))
1579         (etypecase version
1580           ((member :newest) (strings ".NEWEST"))
1581           ((member :wild) (strings ".*"))
1582           (fixnum (strings ".") (strings (format nil "~D" version))))))
1583     (apply #'concatenate 'simple-string (strings))))
1584
1585 ;;; Unparse a logical pathname string.
1586 (defun unparse-enough-namestring (pathname defaults)
1587   (let* ((path-directory (pathname-directory pathname))
1588          (def-directory (pathname-directory defaults))
1589          (enough-directory
1590            ;; Go down the directory lists to see what matches.  What's
1591            ;; left is what we want, more or less.
1592            (cond ((and (eq (first path-directory) (first def-directory))
1593                        (eq (first path-directory) :absolute))
1594                    ;; Both paths are :ABSOLUTE, so find where the
1595                    ;; common parts end and return what's left
1596                    (do* ((p (rest path-directory) (rest p))
1597                          (d (rest def-directory) (rest d)))
1598                         ((or (endp p) (endp d)
1599                              (not (equal (first p) (first d))))
1600                          `(:relative ,@p))))
1601                  (t
1602                    ;; At least one path is :RELATIVE, so just return the
1603                    ;; original path.  If the original path is :RELATIVE,
1604                    ;; then that's the right one.  If PATH-DIRECTORY is
1605                    ;; :ABSOLUTE, we want to return that except when
1606                    ;; DEF-DIRECTORY is :ABSOLUTE, as handled above. so return
1607                    ;; the original directory.
1608                    path-directory))))
1609     (unparse-logical-namestring
1610      (make-pathname :host (pathname-host pathname)
1611                     :directory enough-directory
1612                     :name (pathname-name pathname)
1613                     :type (pathname-type pathname)
1614                     :version (pathname-version pathname)))))
1615
1616 (defun unparse-logical-namestring (pathname)
1617   (declare (type logical-pathname pathname))
1618   (concatenate 'simple-string
1619                (logical-host-name (%pathname-host pathname)) ":"
1620                (unparse-logical-directory pathname)
1621                (unparse-logical-file pathname)))
1622 \f
1623 ;;;; logical pathname translations
1624
1625 ;;; Verify that the list of translations consists of lists and prepare
1626 ;;; canonical translations. (Parse pathnames and expand out wildcards
1627 ;;; into patterns.)
1628 (defun canonicalize-logical-pathname-translations (translation-list host)
1629   (declare (type list translation-list) (type host host)
1630            (values list))
1631   (mapcar (lambda (translation)
1632             (destructuring-bind (from to) translation
1633               (list (if (typep from 'logical-pathname)
1634                         from
1635                         (parse-namestring from host))
1636                     (pathname to))))
1637           translation-list))
1638
1639 (defun logical-pathname-translations (host)
1640   #!+sb-doc
1641   "Return the (logical) host object argument's list of translations."
1642   (declare (type (or string logical-host) host)
1643            (values list))
1644   (logical-host-translations (find-logical-host host)))
1645
1646 (defun (setf logical-pathname-translations) (translations host)
1647   #!+sb-doc
1648   "Set the translations list for the logical host argument."
1649   (declare (type (or string logical-host) host)
1650            (type list translations)
1651            (values list))
1652   (let ((host (intern-logical-host host)))
1653     (setf (logical-host-canon-transls host)
1654           (canonicalize-logical-pathname-translations translations host))
1655     (setf (logical-host-translations host) translations)))
1656
1657 (defun translate-logical-pathname (pathname &key)
1658   #!+sb-doc
1659   "Translate PATHNAME to a physical pathname, which is returned."
1660   (declare (type pathname-designator pathname)
1661            (values (or null pathname)))
1662   (typecase pathname
1663     (logical-pathname
1664      (dolist (x (logical-host-canon-transls (%pathname-host pathname))
1665                 (error 'simple-file-error
1666                        :pathname pathname
1667                        :format-control "no translation for ~S"
1668                        :format-arguments (list pathname)))
1669        (destructuring-bind (from to) x
1670          (when (pathname-match-p pathname from)
1671            (return (translate-logical-pathname
1672                     (translate-pathname pathname from to)))))))
1673     (pathname pathname)
1674     (t (translate-logical-pathname (pathname pathname)))))
1675
1676 (defvar *logical-pathname-defaults*
1677   (%make-logical-pathname
1678    (make-logical-host :name (logical-word-or-lose "BOGUS"))
1679    :unspecific nil nil nil nil))
1680
1681 (defun load-logical-pathname-translations (host)
1682   #!+sb-doc
1683   (declare (type string host)
1684            (values (member t nil)))
1685   (if (find-logical-host host nil)
1686       ;; This host is already defined, all is well and good.
1687       nil
1688       ;; ANSI: "The specific nature of the search is
1689       ;; implementation-defined." SBCL: doesn't search at all
1690       ;;
1691       ;; FIXME: now that we have a SYS host that the system uses, it
1692       ;; might be cute to search in "SYS:TRANSLATIONS;<name>.LISP"
1693       (error "logical host ~S not found" host)))
1694