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% INDEX PSIZZL - indexing macros for TeX version 1.0
% index entries come in two visibilities - non-silent and silent
% non-silent entries are preceeded by a ^
% while silent entries are preceeded by ^^
% the four types of non-silent entries are as follows
% ^{text} - type 0, normal
% ^|text| - type 1, TeX input, but not a control sequence
% ^|\text| - type 2, TeX control sequence
% ^\<text> - type 3, TeX concept, a mnemonic name
%
% the format of the entry in the index file is:
% text_!n_pp. where _ is a space, n is the index type,
% pp is the page number
%
\newif\ifproofindex
\let\numbercount=\relax
\def\\{%
{\tt\char'134}%
}%
\def\<{%
\relax\ifmmode\mskip\medmuskip\else\char'74\fi
}%
\newwrite\@ndexwrite\def\@ndexfile{index.psiztemp }%
\adddef\fmtreset{%
\immediate\openout\@ndexwrite=\@ndexfile % file for index reminders
}%
\newif\ifsilent
\def\specialhat{%
\relax\ifmmode\def\next{^}\else\let\next=\beginxref\fi\next
}%
\def\beginxref{%
\futurelet\next\beginxrefswitch
}%
\def\beginxrefswitch{%
\ifx\next\specialhat\let\next\silentxref
\else\silentfalse\let\next\xref
\fi
\next
}%
{\c@tCactive\global\let^\specialhat\gdef\silentxref^{\silenttrue\xref}}%
\c@tCactive\adddef\l@twrite\l@tCzero %this turns on indexing capability
{\c@tVcontrol\c@tBactive|gdef\{}}% \ as an active character -> nothing
\def\marginstyle{\vrule height6pt depth2pt width0pt \sevenrm}%
\chardef\bslash=`\\
\def\xref{%
\futurelet\next\xrefswitch
}%
\def\xrefswitch{%
\begingroup
\ifx\next|%
\aftergroup\vxref % case 1 or 2, |arg| or |\arg|
\else
\ifx\next\<%
\aftergroup\anglexref % case 3, "\<arg>" means angle bracke
\else
\aftergroup\normalxref% case 0, "{arg}"
\fi
\fi
\endgroup
}%
\def\vxref|{\c@tBactive\futurelet\next\vxrefswitch}%
\def\vxrefswitch#1|{\c@tBcontrol
\ifx\next\empty
\def\xreftype{2}\def\next{{\tt\bslash\text}}% type 2, |\arg|
\else
\def\xreftype{1}\def\next{{\tt\text}}% type 1, |arg|
\fi
\edef\text{#1}\makexref
}%
\def\anglexref\<#1>{%
\def\xreftype{3}\def\text{#1}\def\next{$\langle$\text$\rangle$}%
\makexref
}%
\def\normalxref#1{%
\def\xreftype{0}\def\text{#1}\let\next=\text\makexref
}%
\def\makexref{%
\ifproofindex
\insert\margin{\hbox{\marginstyle\text}}%
\xdef\writeit{%
\write\@ndexwrite{%
\text\space!\xreftype\space\noexpand\number\p@gecount.%
}%
}%
\writeit
\else\ifhmode\kern\z@\fi
\fi
\ifsilent\ignorespaces\else\next\fi
}%
% the \insert (which is done in proofmode only) suppresses hyphenation,
% so the \kern\z@ is put in to give the same effect in non-proofmode.
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