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% This is file cwebhmac.tex, part of the CWEBx distribution.
% This file can be loaded after cwebxmac.tex, in order to automatically
% insert \specials for use by the xhdvi previewer, or any other HyperTeX
% dvi-file processing tool. Current version is alpha release.
% Author: Marc van Leeuwen
% Last modified: 8 november 1996.
% The following macros are redefined
% \stsec
% \note<text><section list>.
% \finnote<text><section list>.
% \X<number>:<module name>\X
\ifx\hyperloaded\undefined \let\hyperloaded\relax \else \endinput\fi
% Low level interface to hyperlinks and targets
% \hyperanchor<attributes><anchor text>
% general mechanism to define <achor text> as anchor with <attributes>
\long\def\hyperanchor#1#2{\special{html:<A #1>}{#2}\special{html:</A>}}
% \hyperlink<URL><active text>
% makes <active text> an active link referring to <URL>
\def\hyperlink#1{\hyperanchor{href="#1"}}
% \hypertarget<tag><target text>
% defines a local target for hyperlinks, that can be referenced by <tag>
\def\hypertarget#1{\hyperanchor{name="#1"}}
% \hyperdef<kind><number><target text>
% defines a hypertarget classified by <kind> and sequence <number>
\def\hyperdef#1#2{\hypertarget{#1.#2}}
% \hyperref<assignments><kind><number><active text>
% creates a hyperlink to local target created by \hyperdef<kind><number>
% <assignments> are optional assignments for expansion of <kind> and <number>
{\catcode`\#=12 \gdef\sharp{#}} % to access neutralised '#' character
\def\hyperref#1#2#3%
{{#1\xdef\next{{\sharp#2.#3}}}\expandafter\hyperlink\next}
% High level interface attached to CWEAVE-produced macros (or to those
% accessed by them via the definition of cwebxmac.tex)
% Target attached to beginning of each section. <kind>=sec, <number>=\secno.
\def\stsec
{\endcodemode\noindent
\hyperdef{sec}\secno{\let\*=\lapstar\bf\secstar.}\quad
}
\let\startsection=\stsec % this one is used; provides hook for extra actions
% List of links attached to end of some sections.
\def\note#1#2.%
{\Y\noindent{\hangindent2\indentunit\baselineskip10pt\eightrm
#1~\hypersecrefs#2, .\par}}
% Same, but for references from the list of module names.
\def\finnote#1#2.{\quad{\eightrm#1~\hypersecrefs#2, .}}
% the following two are auxiliary macros that implement reference lists.
% \hypersecrefs<number>, <number>, ..., <number><ETcode><number>, .
% or \hypersecrefs<number>, .
% make list of hyperlinks to each of then mentioned sections
\def\hypersecrefs#1, #2.%
{\ifx|#2|\def\next{\finalsecrefs#1\ET\ET.#1\ETs\ETs}% final `.' follows below
\else\hyperref{\let\*=\empty}{sec}{#1}{#1}, \let\next=\hypersecrefs
\fi\next#2.%
}
% \finalsecref<n><ETcode><m>\ET\ET.<n><ETcode><m>\ETs\ETs.
% or \finalsecref<n>\ET\ET.<n>\ETs\ETs.
\def\finalsecrefs#1\ET#2\ET#3.#4\ETs#5\ETs#6.%
{\ifx|#2#5|\hyperref{\let\*=\empty}{sec}{#1}{#1}% just 1 reference
\else % <n>\ET<m> or <n>\ETs<m>
\edef\next{\ifx|#5|#1\else#4\fi}% <n>
\toks0={\let\*=\empty}%
\edef\next{{\the\toks0}{sec}{\next}{\next}}%
\expandafter\hyperref\next% link to sec.<n> with text <n>
#3#6% one is empty, the other is \ET or \ETs, as appropriate
\hyperref{\let\*=\empty}{sec}{#2#5}{#2#5}% similar trick, link to sec.<m>
\fi
}
% we must change \ATP slightly, so that \X can recognise it and avoid a link
\def\ATP{\X\ATP\kern-.5em:Preprocessor directives\X}
\def\X#1:#2\X % module name
{\langle\,${#2\eightrm\enspace\ifx\ATP#1\else\hypersecrefs#1, .\fi}$\,\rangle}
{\catcode`_=12 \gdef\usplain{\def\_{_}}}
\let\plainCident=\Cident
\def\Cident#1{\def\idstart{#1}\futurelet\next\testid}
\let\\=\Cident % cwebx only; a \hbox would prevent us from seeing "subscript"
\def\testid
{\ifx_\next
\def\next_##1%
{\hyperref\usplain{id}{\idstart##1}{\plainCident\idstart_{##1}}}%
\else \hyperref\usplain{id}\idstart{\plainCident\idstart}%
\let\next=\empty
\fi\next
}
\def\indextestid
{\ifx_\next
\def\next_##1%
{{\usplain\xdef\next{{id}{\idstart##1}}}%
\expandafter\hyperdef\next{\plainCident\idstart_{##1}}%
}%
\else
{\usplain\xdef\next{{id}{\idstart}}}%
\expandafter\hyperdef\next{\plainCident\idstart}%
\let\next=\empty
\fi\next
}
{\let \inxentry=\relax % remove \outer-ness
\toks0=\expandafter{\inx \let\testid=\indextestid}\xdef\inx{\the\toks0 }
}
\outer\def\inxentry#1#2, #3.% #1 is `h' or `m' for horiz/math mode
{\par\hangindent2em\noindent
\if#1m$#2$\else#2\relax\fi % \relax avoids fatal \next=\fi in \indextestid
:\kern1em\indexrefs#3, .%
}
\def\indexrefs#1, #2.%
{\hyperref{\let\*=\empty\def\[##1]{##1}}{sec}{#1}{#1}%
\ifx|#2|\let\next=\empty\else, \let\next=\indexrefs\fi\next#2.%
}
\def\contentsline#1#2#3#4% #1=depth, #2=title, #3=secno, #4=pageno
{\line{\hyperref{}{sec}{#3}{\ignorespaces#2}
\leaders\hbox to .5em{.\hfil}\hfil
\ \hyperref{}{sec}{#3}{#3 \hbox to3em{\hss#4}}%
}%
}
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