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   (parse-native (missing-arg) :type function)
  22   (unparse (missing-arg) :type function)
  23   (unparse-native (missing-arg) :type function)
  24   (unparse-host (missing-arg) :type function)
  25   (unparse-directory (missing-arg) :type function)
  26   (unparse-file (missing-arg) :type function)
  27   (unparse-enough (missing-arg) :type function)
  28   (unparse-directory-separator (missing-arg) :type simple-string)
  29   (customary-case (missing-arg) :type (member :upper :lower)))
  30
  31 (def!method print-object ((host host) stream)
  32   (print-unreadable-object (host stream :type t :identity t)))
  33
  34 (def!struct (logical-host
  35              (:make-load-form-fun make-logical-host-load-form-fun)
  36              (:include host
  37                        (parse #'parse-logical-namestring)
  38                        (parse-native
  39                         (lambda (x)
  40                           (error "called PARSE-NATIVE-NAMESTRING using a ~
  41                                   logical host: ~S" x)))
  42                        (unparse #'unparse-logical-namestring)
  43                        (unparse-native
  44                         (lambda (x)
  45                           (error "called NATIVE-NAMESTRING using a ~
  46                                   logical host: ~S" x)))
  47                        (unparse-host
  48                         (lambda (x)
  49                           (logical-host-name (%pathname-host x))))
  50                        (unparse-directory #'unparse-logical-directory)
  51                        (unparse-file #'unparse-logical-file)
  52                        (unparse-enough #'unparse-enough-namestring)
  53                        (unparse-directory-separator ";")
  54                        (customary-case :upper)))
  55   (name "" :type simple-string)
  56   (translations nil :type list)
  57   (canon-transls nil :type list))
  58
  59 (def!method print-object ((logical-host logical-host) stream)
  60   (print-unreadable-object (logical-host stream :type t)
  61     (prin1 (logical-host-name logical-host) stream)))
  62
  63 (defun make-logical-host-load-form-fun (logical-host)
  64   (values `(find-logical-host ',(logical-host-name logical-host))
  65           nil))
  66
  67 ;;; A PATTERN is a list of entries and wildcards used for pattern
  68 ;;; matches of translations.
  69 (def!struct (pattern (:constructor make-pattern (pieces)))
  70   (pieces nil :type list))
  71 \f
  72 ;;;; PATHNAME structures
  73
  74 ;;; the various magic tokens that are allowed to appear in pretty much
  75 ;;; all pathname components
  76 (eval-when (#-sb-xc :compile-toplevel :load-toplevel :execute)
  77   (def!type pathname-component-tokens ()
  78     '(member nil :unspecific :wild)))
  79
  80 (sb!xc:defstruct (pathname (:conc-name %pathname-)
  81                            (:constructor %make-pathname (host
  82                                                          device
  83                                                          directory
  84                                                          name
  85                                                          type
  86                                                          version))
  87                            (:predicate pathnamep))
  88   ;; the host (at present either a UNIX or logical host)
  89   (host nil :type (or host null))
  90   ;; the name of a logical or physical device holding files
  91   (device nil :type (or simple-string pathname-component-tokens))
  92   ;; a list of strings that are the component subdirectory components
  93   (directory nil :type list)
  94   ;; the filename
  95   (name nil :type (or simple-string pattern pathname-component-tokens))
  96   ;; the type extension of the file
  97   (type nil :type (or simple-string pattern pathname-component-tokens))
  98   ;; the version number of the file, a positive integer (not supported
  99   ;; on standard Unix filesystems)
 100   (version nil :type (or integer pathname-component-tokens (member :newest))))
 101
 102 ;;; Logical pathnames have the following format:
 103 ;;;
 104 ;;; logical-namestring ::=
 105 ;;;      [host ":"] [";"] {directory ";"}* [name] ["." type ["." version]]
 106 ;;;
 107 ;;; host ::= word
 108 ;;; directory ::= word | wildcard-word | **
 109 ;;; name ::= word | wildcard-word
 110 ;;; type ::= word | wildcard-word
 111 ;;; version ::= pos-int | newest | NEWEST | *
 112 ;;; word ::= {uppercase-letter | digit | -}+
 113 ;;; wildcard-word ::= [word] '* {word '*}* [word]
 114 ;;; pos-int ::= integer > 0
 115 ;;;
 116 ;;; Physical pathnames include all these slots and a device slot.
 117
 118 ;;; Logical pathnames are a subclass of PATHNAME. Their class
 119 ;;; relations are mimicked using structures for efficiency.
 120 (sb!xc:defstruct (logical-pathname (:conc-name %logical-pathname-)
 121                                    (:include pathname)
 122                                    (:constructor %make-logical-pathname
 123                                                  (host
 124                                                   device
 125                                                   directory
 126                                                   name
 127                                                   type
 128                                                   version))))