src/code/pathname.lisp

   1 ;;;; the known-to-the-cross-compiler part of PATHNAME logic
   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 \f
  14 ;;;; data types used by pathnames
  15
  16 ;;; The HOST structure holds the functions that both parse the
  17 ;;; pathname information into structure slot entries, and after
  18 ;;; translation the inverse (unparse) functions.
  19 (def!struct (host (:constructor nil))
  20   (parse (missing-arg) :type function)
  21   (unparse (missing-arg) :type function)
  22   (unparse-host (missing-arg) :type function)
  23   (unparse-directory (missing-arg) :type function)
  24   (unparse-file (missing-arg) :type function)
  25   (unparse-enough (missing-arg) :type function)
  26   (customary-case (missing-arg) :type (member :upper :lower)))
  27
  28 (def!method print-object ((host host) stream)
  29   (print-unreadable-object (host stream :type t :identity t)))
  30
  31 (def!struct (logical-host
  32              (:make-load-form-fun make-logical-host-load-form-fun)
  33              (:include host
  34                        (parse #'parse-logical-namestring)
  35                        (unparse #'unparse-logical-namestring)
  36                        (unparse-host
  37                         (lambda (x)
  38                           (logical-host-name (%pathname-host x))))
  39                        (unparse-directory #'unparse-logical-directory)
  40                        (unparse-file #'unparse-logical-file)
  41                        (unparse-enough #'unparse-enough-namestring)
  42                        (customary-case :upper)))
  43   (name "" :type simple-base-string)
  44   (translations nil :type list)
  45   (canon-transls nil :type list))
  46
  47 (def!method print-object ((logical-host logical-host) stream)
  48   (print-unreadable-object (logical-host stream :type t)
  49     (prin1 (logical-host-name logical-host) stream)))
  50
  51 (defun make-logical-host-load-form-fun (logical-host)
  52   (values `(find-logical-host ',(logical-host-name logical-host))
  53           nil))
  54
  55 ;;; A PATTERN is a list of entries and wildcards used for pattern
  56 ;;; matches of translations.
  57 (def!struct (pattern (:constructor make-pattern (pieces)))
  58   (pieces nil :type list))
  59 \f
  60 ;;;; PATHNAME structures
  61
  62 ;;; the various magic tokens that are allowed to appear in pretty much
  63 ;;; all pathname components
  64 (eval-when (#-sb-xc :compile-toplevel :load-toplevel :execute)
  65   (def!type pathname-component-tokens ()
  66     '(member nil :unspecific :wild)))
  67
  68 (sb!xc:defstruct (pathname (:conc-name %pathname-)
  69                            (:constructor %make-pathname (host
  70                                                          device
  71                                                          directory
  72                                                          name
  73                                                          type
  74                                                          version))
  75                            (:predicate pathnamep))
  76   ;; the host (at present either a UNIX or logical host)
  77   (host nil :type (or host null))
  78   ;; the name of a logical or physical device holding files
  79   (device nil :type (or simple-string pathname-component-tokens))
  80   ;; a list of strings that are the component subdirectory components
  81   (directory nil :type list)
  82   ;; the filename
  83   (name nil :type (or simple-string pattern pathname-component-tokens))
  84   ;; the type extension of the file
  85   (type nil :type (or simple-string pattern pathname-component-tokens))
  86   ;; the version number of the file, a positive integer (not supported
  87   ;; on standard Unix filesystems)
  88   (version nil :type (or integer pathname-component-tokens (member :newest))))
  89
  90 ;;; Logical pathnames have the following format:
  91 ;;;
  92 ;;; logical-namestring ::=
  93 ;;;      [host ":"] [";"] {directory ";"}* [name] ["." type ["." version]]
  94 ;;;
  95 ;;; host ::= word
  96 ;;; directory ::= word | wildcard-word | **
  97 ;;; name ::= word | wildcard-word
  98 ;;; type ::= word | wildcard-word
  99 ;;; version ::= pos-int | newest | NEWEST | *
 100 ;;; word ::= {uppercase-letter | digit | -}+
 101 ;;; wildcard-word ::= [word] '* {word '*}* [word]
 102 ;;; pos-int ::= integer > 0
 103 ;;;
 104 ;;; Physical pathnames include all these slots and a device slot.
 105
 106 ;;; Logical pathnames are a subclass of PATHNAME. Their class
 107 ;;; relations are mimicked using structures for efficiency.
 108 (sb!xc:defstruct (logical-pathname (:conc-name %logical-pathname-)
 109                                    (:include pathname)
 110                                    (:constructor %make-logical-pathname
 111                                                  (host
 112                                                   device
 113                                                   directory
 114                                                   name
 115                                                   type
 116                                                   version))))