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99 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>11.2. Package Names</TITLE>
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</HEAD>
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<BODY>
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<meta name="description" value=" Package Names">
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<meta name="keywords" value="clm">
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<meta name="resource-type" value="document">
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<meta name="distribution" value="global">
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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=tex2html2935 HREF="node114.html"><IMG ALIGN=BOTTOM ALT="next" SRC="icons/next_motif.gif"></A> <A NAME=tex2html2933 HREF="node111.html"><IMG ALIGN=BOTTOM ALT="up" SRC="icons/up_motif.gif"></A> <A NAME=tex2html2927 HREF="node112.html"><IMG ALIGN=BOTTOM ALT="previous" SRC="icons/previous_motif.gif"></A> <A NAME=tex2html2937 HREF="node1.html"><IMG ALIGN=BOTTOM ALT="contents" SRC="icons/contents_motif.gif"></A> <A NAME=tex2html2938 HREF="index.html"><IMG ALIGN=BOTTOM ALT="index" SRC="icons/index_motif.gif"></A> <BR>
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<B> Next:</B> <A NAME=tex2html2936 HREF="node114.html"> Translating Strings to </A>
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<B>Up:</B> <A NAME=tex2html2934 HREF="node111.html"> Packages</A>
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<B> Previous:</B> <A NAME=tex2html2928 HREF="node112.html"> Consistency Rules</A>
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<HR> <P>
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<H1><A NAME=SECTION001520000000000000000>11.2. Package Names</A></H1>
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<P>
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<A NAME=PACKAGENAMESSECTION>Each</A>
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package has a name (a string) and perhaps some nicknames. These
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are assigned when the package is created, though they can be changed
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later. A package's name should be something long and self-explanatory,
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like <tt>editor</tt>; there might be a nickname that is shorter and easier to
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type, such as <tt>ed</tt>.
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<P>
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There is a single name space for packages. The function
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<tt>find-package</tt> translates a package name or nickname into the
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associated package. The function <tt>package-name</tt> returns the name of a
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package. The function <tt>package-nicknames</tt> returns a list of all
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nicknames for a package. The function <tt>rename-package</tt> removes a
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package's current name and nicknames and replaces them with new ones
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specified by the user. Package renaming is occasionally useful when, for
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development purposes, it is desirable to load two versions of a package
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into the same Lisp. One can load the first version, rename it,
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and then load the other version, without getting a lot of name conflicts.
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<P>
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When the Lisp reader sees a qualified symbol, it handles the package-name
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part in the same way as the symbol part with respect to capitalization.
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Lowercase characters in the package name are converted to corresponding
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uppercase characters
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unless preceded by the escape character <tt> </tt> or
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surrounded by <tt>|</tt> characters. The lookup done by the
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<tt>find-package</tt> function is case-sensitive, like that done for
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symbols. Note that <tt>|Foo|:|Bar|</tt> refers to a symbol whose name is
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<tt>Bar</tt> in a package whose name is <tt>Foo</tt>. By contrast,
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<tt>|Foo:Bar|</tt> refers to a seven-character symbol that has a colon in its name
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(as well as two uppercase letters and four lowercase letters)
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and is interned in the current package. Following the convention used
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in this book for symbols, we show ordinary package names using
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lowercase letters, even though the name string is internally represented
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with uppercase letters.
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<P>
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Most of the functions that require a package-name argument from the
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user accept either a symbol or a string. If a symbol is supplied,
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its print name will be used; the print name will already have undergone
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case-conversion by the usual rules. If a string is supplied, it
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must be so capitalized as to match exactly the
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string that names the package.
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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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X3J13 voted in January 1989
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(PACKAGE-FUNCTION-CONSISTENCY) <A NAME=10191> </A>
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to clarify that one may use either a package object or
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a package name (symbol or string) in any of the following
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situations:
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<UL><LI> the <tt>:use</tt> argument to <tt>make-package</tt><p>
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<LI> the first argument to <tt>package-use-list</tt>, <tt>package-used-by-list</tt>,
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<tt>package-name</tt>, <tt>package-nicknames</tt>,
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<tt>in-package</tt>, <tt>find-package</tt>,
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<tt>rename-package</tt>, or <tt>delete-package</tt>,
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<P>
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<LI> the second argument to <tt>intern</tt>, <tt>find-symbol</tt>,
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<tt>unintern</tt>, <tt>export</tt>, <tt>unexport</tt>, <tt>import</tt>, <tt>shadowing-import</tt>,
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or <tt>shadow</tt><p>
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<LI> the first argument, or a member of the list that is the first argument,
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to <tt>use-package</tt> or <tt>unuse-package</tt><p>
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<LI> the value of the <i>package</i> given to <tt>do-symbols</tt>,
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<tt>do-external-symbols</tt>, or <tt>do-all-symbols</tt><p>
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<LI> a member of the <i>package-list</i> given to <tt>with-package-iterator</tt>
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</UL>
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Note that the first argument to <tt>make-package</tt> must still be a package
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name and not an actual package; it makes no sense to create an already
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existing package. Similarly, package nicknames must always be expressed
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as package names and not as package objects. If <tt>find-package</tt> is
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given a package object instead of a name, it simply returns that package.
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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=tex2html2935 HREF="node114.html"><IMG ALIGN=BOTTOM ALT="next" SRC="icons/next_motif.gif"></A> <A NAME=tex2html2933 HREF="node111.html"><IMG ALIGN=BOTTOM ALT="up" SRC="icons/up_motif.gif"></A> <A NAME=tex2html2927 HREF="node112.html"><IMG ALIGN=BOTTOM ALT="previous" SRC="icons/previous_motif.gif"></A> <A NAME=tex2html2937 HREF="node1.html"><IMG ALIGN=BOTTOM ALT="contents" SRC="icons/contents_motif.gif"></A> <A NAME=tex2html2938 HREF="index.html"><IMG ALIGN=BOTTOM ALT="index" SRC="icons/index_motif.gif"></A> <BR>
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<B> Next:</B> <A NAME=tex2html2936 HREF="node114.html"> Translating Strings to </A>
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<B>Up:</B> <A NAME=tex2html2934 HREF="node111.html"> Packages</A>
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<B> Previous:</B> <A NAME=tex2html2928 HREF="node112.html"> Consistency Rules</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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</ADDRESS>
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</BODY>
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