1 ;;;; the known-to-the-cross-compiler part of PATHNAME logic
3 ;;;; This software is part of the SBCL system. See the README file for
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.
12 (in-package "SB!IMPL")
14 ;;;; data types used by pathnames
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 (required-argument) :type function)
21 (unparse (required-argument) :type function)
22 (unparse-host (required-argument) :type function)
23 (unparse-directory (required-argument) :type function)
24 (unparse-file (required-argument) :type function)
25 (unparse-enough (required-argument) :type function)
26 (customary-case (required-argument) :type (member :upper :lower)))
28 (def!struct (logical-host
29 (:make-load-form-fun make-logical-host-load-form-fun)
31 (:parse #'parse-logical-namestring)
32 (:unparse #'unparse-logical-namestring)
35 (logical-host-name (%pathname-host x))))
36 (:unparse-directory #'unparse-logical-directory)
37 (:unparse-file #'unparse-unix-file)
38 (:unparse-enough #'unparse-enough-namestring)
39 (:customary-case :upper)))
40 (name "" :type simple-base-string)
41 (translations nil :type list)
42 (canon-transls nil :type list))
44 (def!method print-object ((logical-host logical-host) stream)
45 (print-unreadable-object (logical-host stream :type t)
46 (prin1 (logical-host-name logical-host) stream)))
48 ;;; What would it mean to dump a logical host and reload it into
49 ;;; another Lisp image? It's not clear, so we don't support it.
50 (defun make-logical-host-load-form-fun (logical-host)
51 (error "~@<A logical host can't be dumped as a constant: ~2I~_~S~:>"
54 ;;; A PATTERN is a list of entries and wildcards used for pattern
55 ;;; matches of translations.
56 (sb!xc:defstruct (pattern (:constructor make-pattern (pieces)))
57 (pieces nil :type list))
59 ;;;; PATHNAME structures
61 ;;; the various magic tokens that are allowed to appear in pretty much
62 ;;; all pathname components
63 (sb!xc:deftype pathname-component-tokens ()
64 '(member nil :unspecific :wild))
66 (sb!xc:defstruct (pathname (:conc-name %pathname-)
67 (:constructor %make-pathname (host
73 (:predicate pathnamep))
74 ;; the host (at present either a UNIX or logical host)
75 (host nil :type (or host null))
76 ;; the name of a logical or physical device holding files
77 (device nil :type (or simple-string pathname-component-tokens))
78 ;; a list of strings that are the component subdirectory components
79 (directory nil :type list)
81 (name nil :type (or simple-string pattern pathname-component-tokens))
82 ;; the type extension of the file
83 (type nil :type (or simple-string pattern pathname-component-tokens))
84 ;; the version number of the file, a positive integer (not supported
85 ;; on standard Unix filesystems)
86 (version nil :type (or integer pathname-component-tokens (member :newest))))
88 ;;; Return a value suitable, e.g., for preinitializing
89 ;;; *DEFAULT-PATHNAME-DEFAULTS* before *DEFAULT-PATHNAME-DEFAULTS* is
90 ;;; initialized (at which time we can't safely call e.g. #'PATHNAME).
91 (defun make-trivial-default-pathname ()
92 (%make-pathname *unix-host* nil nil nil nil :newest))
94 ;;; Logical pathnames have the following format:
96 ;;; logical-namestring ::=
97 ;;; [host ":"] [";"] {directory ";"}* [name] ["." type ["." version]]
100 ;;; directory ::= word | wildcard-word | **
101 ;;; name ::= word | wildcard-word
102 ;;; type ::= word | wildcard-word
103 ;;; version ::= pos-int | newest | NEWEST | *
104 ;;; word ::= {uppercase-letter | digit | -}+
105 ;;; wildcard-word ::= [word] '* {word '*}* [word]
106 ;;; pos-int ::= integer > 0
108 ;;; Physical pathnames include all these slots and a device slot.
110 ;;; Logical pathnames are a subclass of PATHNAME. Their class
111 ;;; relations are mimicked using structures for efficency.
112 (sb!xc:defstruct (logical-pathname (:conc-name %logical-pathname-)
114 (:constructor %make-logical-pathname
122 (defmacro-mundanely enumerate-search-list ((var pathname &optional result)
125 "Execute BODY with VAR bound to each successive possible expansion for
126 PATHNAME and then return RESULT. Note: if PATHNAME does not contain a
127 search-list, then BODY is executed exactly once. Everything is wrapped
128 in a block named NIL, so RETURN can be used to terminate early. Note:
129 VAR is *not* bound inside of RESULT."
130 (let ((body-name (gensym)))
132 (flet ((,body-name (,var)
134 (%enumerate-search-list ,pathname #',body-name)