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<TITLE>CLHS: Section 2.1.4.2</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="02_ada.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Previous]" SRC="../Graphics/Prev.gif" ALIGN=Bottom></A><A REL=UP HREF="02_ada.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Up]" SRC="../Graphics/Up.gif" ALIGN=Bottom></A><A REL=NEXT HREF="02_adc.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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2.1.4.2 Constituent Traits</H2> <P>
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Every <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>character</I></A> has one or more <A REL=DEFINITION HREF="26_glo_c.htm#constituent_trait"><I>constituent traits</I></A> that define how the <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>character</I></A> is to be interpreted by the <A REL=DEFINITION HREF="26_glo_l.htm#lisp_reader"><I>Lisp reader</I></A> when the <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>character</I></A> is a <A REL=DEFINITION HREF="26_glo_c.htm#constituent"><I>constituent</I></A> <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>character</I></A>. These <A REL=DEFINITION HREF="26_glo_c.htm#constituent_trait"><I>constituent traits</I></A> are <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic"><I>alphabetic</I></A>[2], digit, <A REL=DEFINITION HREF="26_glo_p.htm#package_marker"><I>package marker</I></A>, plus sign, minus sign, dot, decimal point, <A REL=DEFINITION HREF="26_glo_r.htm#ratio_marker"><I>ratio marker</I></A>, <A REL=DEFINITION HREF="26_glo_e.htm#exponent_marker"><I>exponent marker</I></A>, and <A REL=DEFINITION HREF="26_glo_i.htm#invalid"><I>invalid</I></A>. <A REL=DEFINITION HREF="#constituenttraitsofstdchars">Figure 2-8</A> shows the <A REL=DEFINITION HREF="26_glo_c.htm#constituent_trait"><I>constituent traits</I></A> of the <A REL=DEFINITION HREF="26_glo_s.htm#standard_character"><I>standard characters</I></A> and of certain <A REL=DEFINITION HREF="26_glo_s.htm#semi-standard"><I>semi-standard</I></A> <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>characters</I></A>; no mechanism is provided for changing the <A REL=DEFINITION HREF="26_glo_c.htm#constituent_trait"><I>constituent trait</I></A> of a <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>character</I></A>. Any <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>character</I></A> with the alphadigit <A REL=DEFINITION HREF="26_glo_c.htm#constituent_trait"><I>constituent trait</I></A> in that figure is a digit if the <A REL=DEFINITION HREF="26_glo_c.htm#current_input_base"><I>current input base</I></A> is greater than that character's digit value, otherwise the <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>character</I></A> is <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic"><I>alphabetic</I></A>[2]. Any <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>character</I></A> quoted by a <A REL=DEFINITION HREF="26_glo_s.htm#single_escape"><I>single escape</I></A> is treated as an <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic"><I>alphabetic</I></A>[2] constituent, regardless of its normal syntax. <P>
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<A NAME="constituenttraitsofstdchars"> <PRE>
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constituent traits constituent traits
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character character
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----------
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Backspace <A REL=DEFINITION HREF="26_glo_i.htm#invalid">invalid</A> { <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic">alphabetic</A>[2]
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Tab <A REL=DEFINITION HREF="26_glo_i.htm#invalid">invalid</A>* } <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic">alphabetic</A>[2]
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Newline <A REL=DEFINITION HREF="26_glo_i.htm#invalid">invalid</A>* + <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic">alphabetic</A>[2], plus sign
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Linefeed <A REL=DEFINITION HREF="26_glo_i.htm#invalid">invalid</A>* - <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic">alphabetic</A>[2], minus sign
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Page <A REL=DEFINITION HREF="26_glo_i.htm#invalid">invalid</A>* . <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic">alphabetic</A>[2], dot, decimal point
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Return <A REL=DEFINITION HREF="26_glo_i.htm#invalid">invalid</A>* / <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic">alphabetic</A>[2], <A REL=DEFINITION HREF="26_glo_r.htm#ratio_marker">ratio marker</A>
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Space <A REL=DEFINITION HREF="26_glo_i.htm#invalid">invalid</A>* A, a alphadigit
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! <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic">alphabetic</A>[2] B, b alphadigit
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" <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic">alphabetic</A>[2]* C, c alphadigit
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# <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic">alphabetic</A>[2]* D, d alphadigit, double-float <A REL=DEFINITION HREF="26_glo_e.htm#exponent_marker">exponent marker</A>
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$ <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic">alphabetic</A>[2] E, e alphadigit, float <A REL=DEFINITION HREF="26_glo_e.htm#exponent_marker">exponent marker</A>
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% <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic">alphabetic</A>[2] F, f alphadigit, single-float <A REL=DEFINITION HREF="26_glo_e.htm#exponent_marker">exponent marker</A>
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& <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic">alphabetic</A>[2] G, g alphadigit
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' <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic">alphabetic</A>[2]* H, h alphadigit
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( <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic">alphabetic</A>[2]* I, i alphadigit
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) <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic">alphabetic</A>[2]* J, j alphadigit
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* <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic">alphabetic</A>[2] K, k alphadigit
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, <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic">alphabetic</A>[2]* L, l alphadigit, long-float <A REL=DEFINITION HREF="26_glo_e.htm#exponent_marker">exponent marker</A>
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0-9 alphadigit M, m alphadigit
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: <A REL=DEFINITION HREF="26_glo_p.htm#package_marker">package marker</A> N, n alphadigit
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; <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic">alphabetic</A>[2]* O, o alphadigit
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< <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic">alphabetic</A>[2] P, p alphadigit
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= <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic">alphabetic</A>[2] Q, q alphadigit
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> <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic">alphabetic</A>[2] R, r alphadigit
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? <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic">alphabetic</A>[2] S, s alphadigit, short-float <A REL=DEFINITION HREF="26_glo_e.htm#exponent_marker">exponent marker</A>
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@ <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic">alphabetic</A>[2] T, t alphadigit
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[ <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic">alphabetic</A>[2] U, u alphadigit
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\ <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic">alphabetic</A>[2]* V, v alphadigit
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] <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic">alphabetic</A>[2] W, w alphadigit
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^ <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic">alphabetic</A>[2] X, x alphadigit
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_ <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic">alphabetic</A>[2] Y, y alphadigit
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` <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic">alphabetic</A>[2]* Z, z alphadigit
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| <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic">alphabetic</A>[2]* Rubout <A REL=DEFINITION HREF="26_glo_i.htm#invalid">invalid</A>
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~ <A REL=DEFINITION HREF="26_glo_a.htm#alphabetic">alphabetic</A>[2]
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</PRE>
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<P><B>Figure 2-8. Constituent Traits of Standard Characters and Semi-Standard Characters</B></A> <P>
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The interpretations in this table apply only to <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>characters</I></A> whose <A REL=DEFINITION HREF="26_glo_s.htm#syntax_type"><I>syntax type</I></A> is <A REL=DEFINITION HREF="26_glo_c.htm#constituent"><I>constituent</I></A>. Entries marked with an asterisk (*) are normally <I>shadowed</I>[2] because the indicated <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>characters</I></A> are of <A REL=DEFINITION HREF="26_glo_s.htm#syntax_type"><I>syntax type</I></A> <A REL=DEFINITION HREF="26_glo_w.htm#whitespace"><I>whitespace</I></A>[2], <A REL=DEFINITION HREF="26_glo_m.htm#macro_character"><I>macro character</I></A>, <A REL=DEFINITION HREF="26_glo_s.htm#single_escape"><I>single escape</I></A>, or <A REL=DEFINITION HREF="26_glo_m.htm#multiple_escape"><I>multiple escape</I></A>; these <A REL=DEFINITION HREF="26_glo_c.htm#constituent_trait"><I>constituent traits</I></A> apply to them only if their <A REL=DEFINITION HREF="26_glo_s.htm#syntax_type"><I>syntax types</I></A> are changed to <A REL=DEFINITION HREF="26_glo_c.htm#constituent"><I>constituent</I></A>. <P>
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