44 lines
6.4 KiB
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44 lines
6.4 KiB
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<!-- Common Lisp HyperSpec (TM), version 7.0 generated by Kent M. Pitman on Mon, 11-Apr-2005 2:31am EDT -->
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<TITLE>CLHS: Section 22.1.3.3.1</TITLE>
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<H1><A REV=MADE HREF="http://www.lispworks.com/"><IMG WIDTH=80 HEIGHT=65 ALT="[LISPWORKS]" SRC="../Graphics/LWSmall.gif" ALIGN=Bottom></A><A REL=TOP HREF="../Front/index.htm"><IMG WIDTH=237 HEIGHT=65 ALT="[Common Lisp HyperSpec (TM)]" SRC="../Graphics/CLHS_Sm.gif" ALIGN=Bottom></A> <A REL=PREV HREF="22_acc.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Previous]" SRC="../Graphics/Prev.gif" ALIGN=Bottom></A><A REL=UP HREF="22_acc.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Up]" SRC="../Graphics/Up.gif" ALIGN=Bottom></A><A REL=NEXT HREF="22_accb.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Next]" SRC="../Graphics/Next.gif" ALIGN=Bottom></A></H1>
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<H2>
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22.1.3.3.1 Package Prefixes for Symbols</H2> <P>
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<A REL=DEFINITION HREF="26_glo_p.htm#package_prefix"><I>Package prefixes</I></A> are printed if necessary. The rules for <A REL=DEFINITION HREF="26_glo_p.htm#package_prefix"><I>package prefixes</I></A> are as follows. When the <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A> is printed, if it is in the <TT>KEYWORD</TT> package, then it is printed with a preceding <A REL=DEFINITION HREF="26_glo_c.htm#colon"><I>colon</I></A>; otherwise, if it is <A REL=DEFINITION HREF="26_glo_a.htm#accessible"><I>accessible</I></A> in the <A REL=DEFINITION HREF="26_glo_c.htm#current_package"><I>current package</I></A>, it is printed without any <A REL=DEFINITION HREF="26_glo_p.htm#package_prefix"><I>package prefix</I></A>; otherwise, it is printed with a <A REL=DEFINITION HREF="26_glo_p.htm#package_prefix"><I>package prefix</I></A>. <P>
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A <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A> that is <A REL=DEFINITION HREF="26_glo_a.htm#apparently_uninterned"><I>apparently uninterned</I></A> is printed preceded by ``<TT>#:</TT>'' if <A REL=DEFINITION HREF="v_pr_gen.htm#STprint-gensymST"><B>*print-gensym*</B></A> is <A REL=DEFINITION HREF="26_glo_t.htm#true"><I>true</I></A> and <A REL=DEFINITION HREF="26_glo_p.htm#printer_escaping"><I>printer escaping</I></A> is enabled; if <A REL=DEFINITION HREF="v_pr_gen.htm#STprint-gensymST"><B>*print-gensym*</B></A> is <A REL=DEFINITION HREF="26_glo_f.htm#false"><I>false</I></A> or <A REL=DEFINITION HREF="26_glo_p.htm#printer_escaping"><I>printer escaping</I></A> is disabled, then the <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A> is printed without a prefix, as if it were in the <A REL=DEFINITION HREF="26_glo_c.htm#current_package"><I>current package</I></A>. <P>
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Because the <TT>#:</TT> syntax does not intern the following symbol, it is necessary to use circular-list syntax if <A REL=DEFINITION HREF="v_pr_cir.htm#STprint-circleST"><B>*print-circle*</B></A> is <A REL=DEFINITION HREF="26_glo_t.htm#true"><I>true</I></A> and the same uninterned symbol appears several times in an expression to be printed. For example, the result of <P>
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<PRE>
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(let ((x (make-symbol "FOO"))) (list x x))
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</PRE>
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</TT> would be printed as <TT>(#:foo #:foo)</TT> if <A REL=DEFINITION HREF="v_pr_cir.htm#STprint-circleST"><B>*print-circle*</B></A> were <A REL=DEFINITION HREF="26_glo_f.htm#false"><I>false</I></A>, but as <TT>(#1=#:foo #1#)</TT> if <A REL=DEFINITION HREF="v_pr_cir.htm#STprint-circleST"><B>*print-circle*</B></A> were <A REL=DEFINITION HREF="26_glo_t.htm#true"><I>true</I></A>. <P>
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A summary of the preceding package prefix rules follows: <P>
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<P><DL><DT><TT>foo:bar</TT> <P><DD>
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<TT>foo:bar</TT> is printed when <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A> <TT>bar</TT> is external in its <A REL=DEFINITION HREF="26_glo_h.htm#home_package"><I>home package</I></A> <TT>foo</TT> and is not <A REL=DEFINITION HREF="26_glo_a.htm#accessible"><I>accessible</I></A> in the <A REL=DEFINITION HREF="26_glo_c.htm#current_package"><I>current package</I></A>. <P>
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<DT><TT>foo::bar</TT> <P><DD>
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<TT>foo::bar</TT> is printed when <TT>bar</TT> is internal in its <A REL=DEFINITION HREF="26_glo_h.htm#home_package"><I>home package</I></A> <TT>foo</TT> and is not <A REL=DEFINITION HREF="26_glo_a.htm#accessible"><I>accessible</I></A> in the <A REL=DEFINITION HREF="26_glo_c.htm#current_package"><I>current package</I></A>. <P>
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<DT><TT>:bar</TT> <P><DD>
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<TT>:bar</TT> is printed when the home package of <TT>bar</TT> is the <TT>KEYWORD</TT> package. <P>
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<DT><TT>#:bar</TT> <P><DD>
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<TT>#:bar</TT> is printed when <TT>bar</TT> is <A REL=DEFINITION HREF="26_glo_a.htm#apparently_uninterned"><I>apparently uninterned</I></A>, even in the pathological case that <TT>bar</TT> has no <A REL=DEFINITION HREF="26_glo_h.htm#home_package"><I>home package</I></A> but is nevertheless somehow <A REL=DEFINITION HREF="26_glo_a.htm#accessible"><I>accessible</I></A> in the <A REL=DEFINITION HREF="26_glo_c.htm#current_package"><I>current package</I></A>. <P></DL><P>
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<P><HR>The following <A REL=META HREF="../Front/X3J13Iss.htm">X3J13 cleanup issue</A>, <I>not part of the specification</I>, applies to this section:<P><UL><LI> <A REL=CHILD HREF="../Issues/iss276.htm">PRINT-READABLY-BEHAVIOR:CLARIFY</A><P></UL><HR>
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<A REL=COPYRIGHT HREF="../Front/Help.htm#Legal"><I>Copyright 1996-2005, LispWorks Ltd. All rights reserved.</I></A><P>
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