61 lines
3.4 KiB
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61 lines
3.4 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 23.1.2.1</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="23_ab.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Previous]" SRC="../Graphics/Prev.gif" ALIGN=Bottom></A><A REL=UP HREF="23_ab.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Up]" SRC="../Graphics/Up.gif" ALIGN=Bottom></A><A REL=NEXT HREF="23_ac.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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23.1.2.1 Examples of Effect of Readtable Case on the Lisp Reader</H2> <P>
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<PRE>
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(defun test-readtable-case-reading ()
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(let ((*readtable* (copy-readtable nil)))
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(format t "READTABLE-CASE Input Symbol-name~
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~%-----------------------------------~
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~%")
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(dolist (readtable-case '(:upcase :downcase :preserve :invert))
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(setf (readtable-case *readtable*) readtable-case)
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(dolist (input '("ZEBRA" "Zebra" "zebra"))
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(format t "~&:~A~16T~A~24T~A"
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(string-upcase readtable-case)
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input
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(symbol-name (read-from-string input)))))))
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</PRE>
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</TT> <P>
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The output from <TT>(test-readtable-case-reading)</TT> should be as follows: <P>
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<PRE>
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READTABLE-CASE Input Symbol-name
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-------------------------------------
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:UPCASE ZEBRA ZEBRA
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:UPCASE Zebra ZEBRA
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:UPCASE zebra ZEBRA
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:DOWNCASE ZEBRA zebra
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:DOWNCASE Zebra zebra
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:DOWNCASE zebra zebra
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:PRESERVE ZEBRA ZEBRA
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:PRESERVE Zebra Zebra
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:PRESERVE zebra zebra
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:INVERT ZEBRA zebra
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:INVERT Zebra Zebra
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:INVERT zebra ZEBRA
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</PRE>
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