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41 lines
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<TITLE>CLHS: Section 23.1.2</TITLE>
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23.1.2 Effect of Readtable Case on the Lisp Reader</H2> <P>
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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 <A REL=DEFINITION HREF="26_glo_l.htm#lisp_reader"><I>Lisp reader</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>, unescaped constituent <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>characters</I></A> are converted to <A REL=DEFINITION HREF="26_glo_u.htm#uppercase"><I>uppercase</I></A>, as specified in <A REL=CHILD HREF="02_b.htm">Section 2.2 (Reader Algorithm)</A>. <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>, unescaped constituent <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>characters</I></A> are converted to <A REL=DEFINITION HREF="26_glo_l.htm#lowercase"><I>lowercase</I></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>, the case of all <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>characters</I></A> remains unchanged. <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>, then if all of the unescaped letters in the extended token are of the same <A REL=DEFINITION HREF="26_glo_c.htm#case"><I>case</I></A>, those (unescaped) letters are converted to the opposite <A REL=DEFINITION HREF="26_glo_c.htm#case"><I>case</I></A>. <P>
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<P></DL><P>
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<A REL=CHILD HREF="23_aba.htm"><H2>
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23.1.2.1 Examples of Effect of Readtable Case on the Lisp Reader</H2></A><P><HR>
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