Common Lisp the Language, 2nd Edition

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23.1.5.2. Parsing of Logical Pathname Namestrings

Logical pathname namestrings are recognized by the functions logical-pathname and translate-logical-pathname. The host portion of the logical pathname namestring and its following colon must appear in the namestring arguments to these functions.

The function parse-namestring recognizes a logical pathname namestring when the host argument is logical or the defaults argument is a logical pathname. In this case the host portion of the logical pathname namestring and its following colon are optional. If the host portion of the namestring and the host argument are both present and do not match, an error is signaled. The host argument is logical if it is supplied and came from pathname-host of a logical pathname. Whether a host argument is logical if it is a string equal to a logical pathname host name is implementation-defined.

The function merge-pathnames recognizes a logical pathname namestring when the defaults argument is a logical pathname. In this case the host portion of the logical pathname namestring and its following colon are optional.

Whether the other functions that coerce strings to pathnames recognize logical pathname namestrings is implementation-defined. These functions include parse-namestring in circumstances other than those described above, merge-pathnames in circumstances other than those described above, the :defaults argument to make-pathname, and the following functions:

compile-file           file-write-date     pathname-name 
compile-file-pathname  host-namestring     pathname-type 
delete-file            load                pathname-version 
directory              namestring          probe-file 
directory-namestring   open                rename-file 
dribble                pathname            translate-pathname 
ed                     pathname-device     truename 
enough-namestring      pathname-directory  wild-pathname-p 
file-author            pathname-host       with-open-file 
file-namestring        pathname-match-p      

Note that many of these functions must accept logical pathnames even though they do not accept logical pathname namestrings.

Next: Using Logical Pathnames Up: Logical Pathnames Previous: Syntax of Logical

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