69 lines
6.3 KiB
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69 lines
6.3 KiB
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<TITLE>CLHS: Variable *PRINT-CASE*</TITLE>
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<A NAME="STprint-caseST"><I>Variable</I> <B>*PRINT-CASE*</B></A> <P>
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<P><B>Value Type:</B><P>
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<P>
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One of the <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbols</I></A> <TT>:upcase</TT>, <TT>:downcase</TT>, or <TT>:capitalize</TT>. <P>
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<P><B>Initial Value:</B><P>
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<P>
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The <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A> <TT>:upcase</TT>. <P>
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<P><B>Description:</B><P>
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<P>
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The <A REL=DEFINITION HREF="26_glo_v.htm#value"><I>value</I></A> of <A REL=DEFINITION HREF="#STprint-caseST"><B>*print-case*</B></A> controls the case (upper, lower, or mixed) in which to print any uppercase characters in the names of <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbols</I></A> when vertical-bar syntax is not used. <P>
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<A REL=DEFINITION HREF="#STprint-caseST"><B>*print-case*</B></A> has an effect at all times when the <A REL=DEFINITION HREF="26_glo_v.htm#value"><I>value</I></A> of <A REL=DEFINITION HREF="v_pr_esc.htm#STprint-escapeST"><B>*print-escape*</B></A> is <A REL=DEFINITION HREF="26_glo_f.htm#false"><I>false</I></A>. <A REL=DEFINITION HREF="#STprint-caseST"><B>*print-case*</B></A> also has an effect when the <A REL=DEFINITION HREF="26_glo_v.htm#value"><I>value</I></A> of <A REL=DEFINITION HREF="v_pr_esc.htm#STprint-escapeST"><B>*print-escape*</B></A> is <A REL=DEFINITION HREF="26_glo_t.htm#true"><I>true</I></A> unless inside an escape context (i.e., unless between <A REL=DEFINITION HREF="26_glo_v.htm#vertical-bar"><I>vertical-bars</I></A> or after a <A REL=DEFINITION HREF="26_glo_s.htm#slash"><I>slash</I></A>). <P>
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<P><B>Examples:</B><P>
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<P>
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<PRE>
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(defun test-print-case ()
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(dolist (*print-case* '(:upcase :downcase :capitalize))
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(format t "~&~S ~S~%" 'this-and-that '|And-something-elSE|)))
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=> TEST-PC
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;; Although the choice of which characters to escape is specified by
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;; *PRINT-CASE*, the choice of how to escape those characters
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;; (i.e., whether single escapes or multiple escapes are used)
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;; is implementation-dependent. The examples here show two of the
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;; many valid ways in which escaping might appear.
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(test-print-case) ;Implementation A
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>> THIS-AND-THAT |And-something-elSE|
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>> this-and-that a\n\d-\s\o\m\e\t\h\i\n\g-\e\lse
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>> This-And-That A\n\d-\s\o\m\e\t\h\i\n\g-\e\lse
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=> NIL
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(test-print-case) ;Implementation B
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>> THIS-AND-THAT |And-something-elSE|
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>> this-and-that a|nd-something-el|se
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>> This-And-That A|nd-something-el|se
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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>See Also:</B><P>
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<P>
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<A REL=DEFINITION HREF="f_wr_pr.htm#write"><B>write</B></A> <P>
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<P><B>Notes:</B><P>
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<P>
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<A REL=DEFINITION HREF="f_rd_rd.htm#read"><B>read</B></A> normally converts lowercase characters appearing in <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbols</I></A> to corresponding uppercase characters, so that internally print names normally contain only uppercase characters. <P>
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If <A REL=DEFINITION HREF="v_pr_esc.htm#STprint-escapeST"><B>*print-escape*</B></A> is <A REL=DEFINITION HREF="26_glo_t.htm#true"><I>true</I></A>, lowercase characters in the <A REL=DEFINITION HREF="26_glo_n.htm#name"><I>name</I></A> of a <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A> are always printed in lowercase, and are preceded by a single escape character or enclosed by multiple escape characters; uppercase characters in the <A REL=DEFINITION HREF="26_glo_n.htm#name"><I>name</I></A> of a <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A> are printed in upper case, in lower case, or in mixed case so as to capitalize words, according to the value of <A REL=DEFINITION HREF="#STprint-caseST"><B>*print-case*</B></A>. The convention for what constitutes a ``word'' is the same as for <A REL=DEFINITION HREF="f_stg_up.htm#string-capitalize"><B>string-capitalize</B></A>. <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/iss272.htm">PRINT-CASE-BEHAVIOR:CLARIFY</A><LI> <A REL=CHILD HREF="../Issues/iss204.htm">JUN90-TRIVIAL-ISSUES:3</A><LI> <A REL=CHILD HREF="../Issues/iss273.htm">PRINT-CASE-PRINT-ESCAPE-INTERACTION:VERTICAL-BAR-RULE-NO-UPCASE</A><P></UL><HR>
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