53 lines
3.9 KiB
HTML
53 lines
3.9 KiB
HTML
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<TITLE>CLHS: Variable *PRINT-LINES*</TITLE>
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<A NAME="STprint-linesST"><I>Variable</I> <B>*PRINT-LINES*</B></A> <P>
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<P><B>Value Type:</B><P>
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<P>
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a non-negative <A REL=DEFINITION HREF="26_glo_i.htm#integer"><I>integer</I></A>, or <A REL=DEFINITION HREF="a_nil.htm#nil"><B>nil</B></A>. <P>
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<P><B>Initial Value:</B><P>
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<P>
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<A REL=DEFINITION HREF="a_nil.htm#nil"><B>nil</B></A>. <P>
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<P><B>Description:</B><P>
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<P>
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When the <A REL=DEFINITION HREF="26_glo_v.htm#value"><I>value</I></A> of <A REL=DEFINITION HREF="#STprint-linesST"><B>*print-lines*</B></A> is other than <A REL=DEFINITION HREF="a_nil.htm#nil"><B>nil</B></A>, it is a limit on the number of output lines produced when something is pretty printed. If an attempt is made to go beyond that many lines, ``<TT>..</TT>'' is printed at the end of the last line followed by all of the suffixes (closing delimiters) that are pending to be printed. <P>
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<P><B>Examples:</B><P>
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<P>
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<PRE>
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(let ((*print-right-margin* 25) (*print-lines* 3))
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(pprint '(progn (setq a 1 b 2 c 3 d 4))))
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>> (PROGN (SETQ A 1
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>> B 2
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>> C 3 ..))
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=> <no values>
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</PRE>
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</TT> <P>
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<P><B>See Also:</B> None.
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<P>
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<P><B>Notes:</B><P>
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<P>
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The ``<TT>..</TT>'' notation is intentionally different than the ``<TT>...</TT>'' notation used for level abbreviation, so that the two different situations can be visually distinguished. <P>
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This notation is used to increase the likelihood that the <A REL=DEFINITION HREF="26_glo_l.htm#lisp_reader"><I>Lisp reader</I></A> will signal an error if an attempt is later made to read the abbreviated output. Note however that if the truncation occurs in a <A REL=DEFINITION HREF="26_glo_s.htm#string"><I>string</I></A>, as in <TT>"This string has been trunc.."</TT>, the problem situation cannot be detected later and no such error will be signaled. <P>
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