41 lines
6.3 KiB
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41 lines
6.3 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</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_acb.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Previous]" SRC="../Graphics/Prev.gif" ALIGN=Bottom></A><A REL=UP HREF="22_ac.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Up]" SRC="../Graphics/Up.gif" ALIGN=Bottom></A><A REL=NEXT HREF="22_acca.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 Printing Symbols</H2> <P>
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When <A REL=DEFINITION HREF="26_glo_p.htm#printer_escaping"><I>printer escaping</I></A> is disabled, only the characters of the <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A>'s <A REL=DEFINITION HREF="26_glo_n.htm#name"><I>name</I></A> are output (but the case in which to print characters in the <A REL=DEFINITION HREF="26_glo_n.htm#name"><I>name</I></A> is controlled by <A REL=DEFINITION HREF="v_pr_cas.htm#STprint-caseST"><B>*print-case*</B></A>; see <A REL=CHILD HREF="22_accb.htm">Section 22.1.3.3.2 (Effect of Readtable Case on the Lisp Printer)</A>). <P>
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The remainder of Section 22.1.3.3 applies only when <A REL=DEFINITION HREF="26_glo_p.htm#printer_escaping"><I>printer escaping</I></A> is enabled. <P>
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When printing a <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A>, the printer inserts enough <A REL=DEFINITION HREF="26_glo_s.htm#single_escape"><I>single escape</I></A> and/or <A REL=DEFINITION HREF="26_glo_m.htm#multiple_escape"><I>multiple escape</I></A> characters (<A REL=DEFINITION HREF="26_glo_b.htm#backslash"><I>backslashes</I></A> and/or <A REL=DEFINITION HREF="26_glo_v.htm#vertical-bar"><I>vertical-bars</I></A>) so that if <A REL=DEFINITION HREF="f_rd_rd.htm#read"><B>read</B></A> were called with the same <A REL=DEFINITION HREF="v_rdtabl.htm#STreadtableST"><B>*readtable*</B></A> and with <A REL=DEFINITION HREF="v_rd_bas.htm#STread-baseST"><B>*read-base*</B></A> bound to the <A REL=DEFINITION HREF="26_glo_c.htm#current_output_base"><I>current output base</I></A>, it would return the same <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A> (if it is not <A REL=DEFINITION HREF="26_glo_a.htm#apparently_uninterned"><I>apparently uninterned</I></A>) or an <A REL=DEFINITION HREF="26_glo_u.htm#uninterned"><I>uninterned</I></A> <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A> with the same <A REL=DEFINITION HREF="26_glo_p.htm#print_name"><I>print name</I></A> (otherwise). <P>
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For example, if the <A REL=DEFINITION HREF="26_glo_v.htm#value"><I>value</I></A> of <A REL=DEFINITION HREF="v_pr_bas.htm#STprint-baseST"><B>*print-base*</B></A> were <TT>16</TT> when printing the symbol <TT>face</TT>, it would have to be printed as <TT>\FACE</TT> or <TT>\Face</TT> or <TT></TT>|<TT>FACE</TT>|<TT></TT>, because the token <TT>face</TT> would be read as a hexadecimal number (decimal value 64206) if the <A REL=DEFINITION HREF="26_glo_v.htm#value"><I>value</I></A> of <A REL=DEFINITION HREF="v_rd_bas.htm#STread-baseST"><B>*read-base*</B></A> were <TT>16</TT>. <P>
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For additional restrictions concerning characters with nonstandard <A REL=DEFINITION HREF="26_glo_s.htm#syntax_type"><I>syntax types</I></A> in the <A REL=DEFINITION HREF="26_glo_c.htm#current_readtable"><I>current readtable</I></A>, see the <A REL=DEFINITION HREF="26_glo_v.htm#variable"><I>variable</I></A> <A REL=DEFINITION HREF="v_pr_rda.htm#STprint-readablyST"><B>*print-readably*</B></A> <P>
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For information about how the <A REL=DEFINITION HREF="26_glo_l.htm#lisp_reader"><I>Lisp reader</I></A> parses <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbols</I></A>, see <A REL=CHILD HREF="02_cd.htm">Section 2.3.4 (Symbols as Tokens)</A> and <A REL=CHILD HREF="02_dhe.htm">Section 2.4.8.5 (Sharpsign Colon)</A>. <P>
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<A REL=DEFINITION HREF="a_nil.htm#nil"><B>nil</B></A> might be printed as <TT>()</TT> when <A REL=DEFINITION HREF="v_pr_pre.htm#STprint-prettyST"><B>*print-pretty*</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. <P>
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<A REL=CHILD HREF="22_acca.htm"><H2>
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22.1.3.3.1 Package Prefixes for Symbols</H2></A><P>
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<A REL=CHILD HREF="22_accb.htm"><H2>
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22.1.3.3.2 Effect of Readtable Case on the Lisp Printer</H2></A><P><P><HR>The following <A REL=META HREF="../Front/X3J13Iss.htm">X3J13 cleanup issues</A>, <I>not part of the specification</I>, apply to this section:<P><UL><LI> <A REL=CHILD HREF="../Issues/iss341.htm">SYMBOL-PRINT-ESCAPE-BEHAVIOR:CLARIFY</A><LI> <A REL=CHILD HREF="../Issues/iss272.htm">PRINT-CASE-BEHAVIOR:CLARIFY</A><LI> <A REL=CHILD HREF="../Issues/iss276.htm">PRINT-READABLY-BEHAVIOR:CLARIFY</A><P></UL><HR>
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<A REL=NAVIGATOR HREF="../Front/StartPts.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Starting Points]" SRC="../Graphics/StartPts.gif" ALIGN=Bottom></A><A REL=TOC HREF="../Front/Contents.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Contents]" SRC="../Graphics/Contents.gif" ALIGN=Bottom></A><A REL=INDEX HREF="../Front/X_Master.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Index]" SRC="../Graphics/Index.gif" ALIGN=Bottom></A><A REL=INDEX HREF="../Front/X_Symbol.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Symbols]" SRC="../Graphics/Symbols.gif" ALIGN=Bottom></A><A REL=GLOSSARY HREF="../Body/26_a.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Glossary]" SRC="../Graphics/Glossary.gif" ALIGN=Bottom></A><A HREF="../Front/X3J13Iss.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Issues]" SRC="../Graphics/Issues.gif" ALIGN=Bottom></A><BR>
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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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