79 lines
6.5 KiB
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79 lines
6.5 KiB
HTML
<!-- 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: Function CHAR-UPCASE, CHAR-DOWNCASE</TITLE>
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<A NAME="char-upcase"><A NAME="char-downcase"><I>Function</I> <B>CHAR-UPCASE, CHAR-DOWNCASE</B></A></A> <P>
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<P><B>Syntax:</B><P>
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<P>
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<B>char-upcase</B> <I>character</I> => <I>corresponding-character</I><P>
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<B>char-downcase</B> <I>character</I> => <I>corresponding-character</I><P>
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<P>
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<P><B>Arguments and Values:</B><P>
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<P>
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<I>character</I>, <I>corresponding-character</I>---a <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>character</I></A>. <P>
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<P><B>Description:</B><P>
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<P>
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If <I>character</I> is a <A REL=DEFINITION HREF="26_glo_l.htm#lowercase"><I>lowercase</I></A> <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>character</I></A>, <A REL=DEFINITION HREF="#char-upcase"><B>char-upcase</B></A> returns the corresponding <A REL=DEFINITION HREF="26_glo_u.htm#uppercase"><I>uppercase</I></A> <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>character</I></A>. Otherwise, <A REL=DEFINITION HREF="#char-upcase"><B>char-upcase</B></A> just returns the given <I>character</I>. <P>
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If <I>character</I> is an <A REL=DEFINITION HREF="26_glo_u.htm#uppercase"><I>uppercase</I></A> <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>character</I></A>, <A REL=DEFINITION HREF="#char-downcase"><B>char-downcase</B></A> returns the corresponding <A REL=DEFINITION HREF="26_glo_l.htm#lowercase"><I>lowercase</I></A> <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>character</I></A>. Otherwise, <A REL=DEFINITION HREF="#char-downcase"><B>char-downcase</B></A> just returns the given <I>character</I>. <P>
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The result only ever differs from <I>character</I> in its <A REL=DEFINITION HREF="26_glo_c.htm#code"><I>code</I></A> <A REL=DEFINITION HREF="26_glo_a.htm#attribute"><I>attribute</I></A>; all <A REL=DEFINITION HREF="26_glo_i.htm#implementation-defined"><I>implementation-defined</I></A> <A REL=DEFINITION HREF="26_glo_a.htm#attribute"><I>attributes</I></A> are preserved. <P>
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<P><B>Examples:</B><P>
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<P>
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<PRE>
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(char-upcase #\a) => #\A
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(char-upcase #\A) => #\A
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(char-downcase #\a) => #\a
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(char-downcase #\A) => #\a
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(char-upcase #\9) => #\9
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(char-downcase #\9) => #\9
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(char-upcase #\@) => #\@
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(char-downcase #\@) => #\@
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;; Note that this next example might run for a very long time in
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;; some implementations if CHAR-CODE-LIMIT happens to be very large
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;; for that implementation.
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(dotimes (code char-code-limit)
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(let ((char (code-char code)))
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(when char
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(unless (cond ((upper-case-p char) (char= (char-upcase (char-downcase char)) char))
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((lower-case-p char) (char= (char-downcase (char-upcase char)) char))
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(t (and (char= (char-upcase (char-downcase char)) char)
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(char= (char-downcase (char-upcase char)) char))))
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(return char)))))
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=> NIL
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</PRE>
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</TT> <P>
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<P><B>Affected By:</B> None.
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<P>
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<P><B>Exceptional Situations:</B><P>
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<P>
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Should signal an error of <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>type</I></A> <A REL=DEFINITION HREF="e_tp_err.htm#type-error"><B>type-error</B></A> if <I>character</I> is not a <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>character</I></A>. <P>
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<P><B>See Also:</B><P>
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<P>
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<A REL=DEFINITION HREF="f_upper_.htm#upper-case-p"><B>upper-case-p</B></A>, <A REL=DEFINITION HREF="f_alpha_.htm#alpha-char-p"><B>alpha-char-p</B></A>, <A REL=CHILD HREF="13_adc.htm">Section 13.1.4.3 (Characters With Case)</A>, <A REL=CHILD HREF="13_aj.htm">Section 13.1.10 (Documentation of Implementation-Defined Scripts)</A> <P>
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<P><B>Notes:</B><P>
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<P>
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If the <I>corresponding-char</I> is <A REL=DEFINITION HREF="26_glo_d.htm#different"><I>different</I></A> than <I>character</I>, then both the <I>character</I> and the <I>corresponding-char</I> have <A REL=DEFINITION HREF="26_glo_c.htm#case"><I>case</I></A>. <P>
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Since <A REL=DEFINITION HREF="f_chareq.htm#char-equal"><B>char-equal</B></A> ignores the <A REL=DEFINITION HREF="26_glo_c.htm#case"><I>case</I></A> of the <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>characters</I></A> it compares, the <I>corresponding-character</I> is always the <A REL=DEFINITION HREF="26_glo_s.htm#same"><I>same</I></A> as <I>character</I> under <A REL=DEFINITION HREF="f_chareq.htm#char-equal"><B>char-equal</B></A>. <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/iss027.htm">CHARACTER-PROPOSAL:2-1-1</A><P></UL><HR>
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