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49 lines
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<TITLE>CLHS: Section 22.1.3.3.2</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_acca.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_accba.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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22.1.3.3.2 Effect of Readtable Case on the Lisp Printer</H2> <P>
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When <A REL=DEFINITION HREF="26_glo_p.htm#printer_escaping"><I>printer escaping</I></A> is disabled, or the characters under consideration are not already quoted specifically by <A REL=DEFINITION HREF="26_glo_s.htm#single_escape"><I>single escape</I></A> or <A REL=DEFINITION HREF="26_glo_m.htm#multiple_escape"><I>multiple escape</I></A> syntax, the <A REL=DEFINITION HREF="26_glo_r.htm#readtable_case"><I>readtable case</I></A> of the <A REL=DEFINITION HREF="26_glo_c.htm#current_readtable"><I>current readtable</I></A> affects the way the <A REL=DEFINITION HREF="26_glo_l.htm#lisp_printer"><I>Lisp printer</I></A> writes <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbols</I></A> in the following ways: <P>
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<P><DL><DT><TT>:upcase</TT> <P><DD>
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When the <A REL=DEFINITION HREF="26_glo_r.htm#readtable_case"><I>readtable case</I></A> is <TT>:upcase</TT>, <A REL=DEFINITION HREF="26_glo_u.htm#uppercase"><I>uppercase</I></A> <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>characters</I></A> are printed in the case specified by <A REL=DEFINITION HREF="v_pr_cas.htm#STprint-caseST"><B>*print-case*</B></A>, and <A REL=DEFINITION HREF="26_glo_l.htm#lowercase"><I>lowercase</I></A> <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>characters</I></A> are printed in their own case. <P>
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<DT><TT>:downcase</TT> <P><DD>
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When the <A REL=DEFINITION HREF="26_glo_r.htm#readtable_case"><I>readtable case</I></A> is <TT>:downcase</TT>, <A REL=DEFINITION HREF="26_glo_u.htm#uppercase"><I>uppercase</I></A> <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>characters</I></A> are printed in their own case, and <A REL=DEFINITION HREF="26_glo_l.htm#lowercase"><I>lowercase</I></A> <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>characters</I></A> are printed in the case specified by <A REL=DEFINITION HREF="v_pr_cas.htm#STprint-caseST"><B>*print-case*</B></A>. <P>
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<DT><TT>:preserve</TT> <P><DD>
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When the <A REL=DEFINITION HREF="26_glo_r.htm#readtable_case"><I>readtable case</I></A> is <TT>:preserve</TT>, all <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic"><I>alphabetic</I></A> <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>characters</I></A> are printed in their own case. <P>
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<DT><TT>:invert</TT> <P><DD>
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When the <A REL=DEFINITION HREF="26_glo_r.htm#readtable_case"><I>readtable case</I></A> is <TT>:invert</TT>, the case of all <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic"><I>alphabetic</I></A> <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>characters</I></A> in single case symbol names is inverted. Mixed-case symbol names are printed as is. <P></DL><P>
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The rules for escaping <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic"><I>alphabetic</I></A> <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>characters</I></A> in symbol names are affected by the <A REL=DEFINITION HREF="f_rdtabl.htm#readtable-case"><B>readtable-case</B></A> if <A REL=DEFINITION HREF="26_glo_p.htm#printer_escaping"><I>printer escaping</I></A> is enabled. <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic"><I>Alphabetic</I></A> <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>characters</I></A> are escaped as follows: <P><DL><DT><TT>:upcase</TT> <P><DD>
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When the <A REL=DEFINITION HREF="26_glo_r.htm#readtable_case"><I>readtable case</I></A> is <TT>:upcase</TT>, all <A REL=DEFINITION HREF="26_glo_l.htm#lowercase"><I>lowercase</I></A> <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>characters</I></A> must be escaped. <P>
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<DT><TT>:downcase</TT> <P><DD>
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When the <A REL=DEFINITION HREF="26_glo_r.htm#readtable_case"><I>readtable case</I></A> is <TT>:downcase</TT>, all <A REL=DEFINITION HREF="26_glo_u.htm#uppercase"><I>uppercase</I></A> <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>characters</I></A> must be escaped. <P>
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<DT><TT>:preserve</TT> <P><DD>
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When the <A REL=DEFINITION HREF="26_glo_r.htm#readtable_case"><I>readtable case</I></A> is <TT>:preserve</TT>, no <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic"><I>alphabetic</I></A> <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>characters</I></A> need be escaped. <P>
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<DT><TT>:invert</TT> <P><DD>
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When the <A REL=DEFINITION HREF="26_glo_r.htm#readtable_case"><I>readtable case</I></A> is <TT>:invert</TT>, no <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic"><I>alphabetic</I></A> <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>characters</I></A> need be escaped. <P>
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<P></DL><P>
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<A REL=CHILD HREF="22_accba.htm"><H2>
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22.1.3.3.2.1 Examples of 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/iss276.htm">PRINT-READABLY-BEHAVIOR:CLARIFY</A><LI> <A REL=CHILD HREF="../Issues/iss272.htm">PRINT-CASE-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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