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74 lines
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<!DOCTYPE HTML PUBLIC "-//W3O//DTD W3 HTML 2.0//EN">
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<!Converted with LaTeX2HTML 0.6.5 (Tue Nov 15 1994) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds >
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<HEAD>
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<TITLE>23.1.5.2. Parsing of Logical Pathname Namestrings</TITLE>
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<meta name="description" value=" Parsing of Logical Pathname Namestrings">
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<meta name="keywords" value="clm">
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<P>
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<b>Common Lisp the Language, 2nd Edition</b>
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<BR> <HR><A NAME=tex2html4184 HREF="node211.html"><IMG ALIGN=BOTTOM ALT="next" SRC="icons/next_motif.gif"></A> <A NAME=tex2html4182 HREF="node208.html"><IMG ALIGN=BOTTOM ALT="up" SRC="icons/up_motif.gif"></A> <A NAME=tex2html4176 HREF="node209.html"><IMG ALIGN=BOTTOM ALT="previous" SRC="icons/previous_motif.gif"></A> <A NAME=tex2html4186 HREF="node1.html"><IMG ALIGN=BOTTOM ALT="contents" SRC="icons/contents_motif.gif"></A> <A NAME=tex2html4187 HREF="index.html"><IMG ALIGN=BOTTOM ALT="index" SRC="icons/index_motif.gif"></A> <BR>
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<B> Next:</B> <A NAME=tex2html4185 HREF="node211.html"> Using Logical Pathnames</A>
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<B>Up:</B> <A NAME=tex2html4183 HREF="node208.html"> Logical Pathnames</A>
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<B> Previous:</B> <A NAME=tex2html4177 HREF="node209.html"> Syntax of Logical </A>
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<HR> <P>
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<H3><A NAME=SECTION002715200000000000000>23.1.5.2. Parsing of Logical Pathname Namestrings</A></H3>
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<P>
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<img align=bottom alt="change_begin" src="gif/change_begin.gif"><br>
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Logical pathname namestrings are recognized by the functions <tt>logical-pathname</tt>
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and <tt>translate-logical-pathname</tt>. The host portion
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of the logical pathname namestring and its following colon must appear in
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the namestring arguments to these functions.
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<P>
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The function <tt>parse-namestring</tt> recognizes a logical pathname
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namestring when the <i>host</i> argument is logical or the <i>defaults</i> argument is
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a logical pathname. In this case the host portion of the logical
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pathname namestring and its following colon are optional. If the host
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portion of the namestring and the <i>host</i> argument are both present and do
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not match, an error is signaled.
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The host argument is logical if it is supplied and came from
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<tt>pathname-host</tt> of a logical pathname. Whether a host argument is logical
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if it is a string <tt>equal</tt> to a logical pathname host name is
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implementation-defined.
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<P>
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The function <tt>merge-pathnames</tt> recognizes a logical pathname namestring
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when the <i>defaults</i> argument is a logical pathname. In this case the host
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portion of the logical pathname namestring and its following colon are
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optional.
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<P>
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Whether the other functions that coerce strings to pathnames
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recognize logical pathname namestrings is implementation-defined.
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These functions include <tt>parse-namestring</tt> in circumstances other than those described above,
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<tt>merge-pathnames</tt> in circumstances other than those described above,
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the <tt>:defaults</tt> argument to <tt>make-pathname</tt>, and the following functions:
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<pre>
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compile-file file-write-date pathname-name
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compile-file-pathname host-namestring pathname-type
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delete-file load pathname-version
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directory namestring probe-file
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directory-namestring open rename-file
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dribble pathname translate-pathname
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ed pathname-device truename
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enough-namestring pathname-directory wild-pathname-p
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file-author pathname-host with-open-file
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file-namestring pathname-match-p
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</pre>
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Note that many of these functions must accept logical pathnames even though
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they do not accept logical pathname namestrings.
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<br><img align=bottom alt="change_end" src="gif/change_end.gif">
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<P>
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<BR> <HR><A NAME=tex2html4184 HREF="node211.html"><IMG ALIGN=BOTTOM ALT="next" SRC="icons/next_motif.gif"></A> <A NAME=tex2html4182 HREF="node208.html"><IMG ALIGN=BOTTOM ALT="up" SRC="icons/up_motif.gif"></A> <A NAME=tex2html4176 HREF="node209.html"><IMG ALIGN=BOTTOM ALT="previous" SRC="icons/previous_motif.gif"></A> <A NAME=tex2html4186 HREF="node1.html"><IMG ALIGN=BOTTOM ALT="contents" SRC="icons/contents_motif.gif"></A> <A NAME=tex2html4187 HREF="index.html"><IMG ALIGN=BOTTOM ALT="index" SRC="icons/index_motif.gif"></A> <BR>
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<B> Next:</B> <A NAME=tex2html4185 HREF="node211.html"> Using Logical Pathnames</A>
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<B>Up:</B> <A NAME=tex2html4183 HREF="node208.html"> Logical Pathnames</A>
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<B> Previous:</B> <A NAME=tex2html4177 HREF="node209.html"> Syntax of Logical </A>
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<HR> <P>
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<HR>
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<P><ADDRESS>
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AI.Repository@cs.cmu.edu
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