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% scanbase. tex
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% 26. 10. 2002 Petr Olsak
% This is a macro for processing the mysql outputs in plain TeX
% The input is supposed in the format:
%
%
% arbitrary text before table
% it is ignored
% +------------+------------+----------------------------+
% | header1 | header2 | header3 ... |
% +------------+------------+----------------------------+
% | text 1,1 | text 1,2 | text 1,3 ... |
% | text 2,1 | text 2,2 | text 2,3 ... |
% | text 3,1 | text 3,2 | text 3,3 ... |
% | ... | ... | ... |
% +------------+------------+----------------------------+
%
% You can process such file by
%
% \input scanbase.tex
% \def\lineaction{...}
% \scanbase file
%
% The macro reads the headres first and then reads the lines
% with the text. The contents of each item can be accessed
% by full expanable macro \e after each line is read. More preciselly,
% \e[header] expands to the body of the appropriate item.
% The \lineaction macro is processed after each line is read.
% It is supposed that \lineaction is defined by user.
%
% Next line of the table is read after \lineaction, the \e macros have
% a new meaning (items from this next line) and the \lineaction is executed
% again. This is repeated until last line of the input table is reached.
% Moreower, the \linenum register is available, where the number of the
% last scanned line is stored.
%
% Example:
%
% \input scanbase
%
% \newcount \mylines
% \def\bb #1 #2/{\hbox to#1{#2\hss}}
%
% \def\printaction{\global\advance\mylines by1 %% \scanabase works
% \hbox{% %% inside the TeX group
% \bb 2em \the\numline./
% \bb 26em \e[subject]/
% \bb 10em \e[lastname] \e[firstname]/
% \bb 3em \hfill\e[pay2002]/
% \bb 3em \hfill\e[pay2001]/}
% }
% \def\lineaction{\if K\e[member_type]% Institutional members
% \printaction
% \else \if G\e[member_type]% High school
% \printaction
% \fi\fi % I am printing Institutional mambers and high schools only
% }
% \scanbase database1
% \scanbase database2
% {\it Number of printed lines: \the\mylines}.
% \end
%
% If the \lineaction macro isn't defined by user then scanbase used
% its own (default) macro which prints all items from one line
% into the one paragraph in comprimend form (you can try this).
%
% The \scanbase macro opens the TeX group then runs \beginhook
% then reads headers, then reads the lines ans processes \linecation
% repeatedly, then runs \endhook and finally closes the group.
% Default values for \beginhook and \endhook is \relax but user
% can define something else.
\newcount\colnum \newcount\numline
\font\seventt=cstt10 at7pt
\catcode`\^^X=13 \def^^X{}
\def\scanfirstline #1-+^^X|{\scanheader}
\def\scanheader #1 |{\advance\colnum by1
\expandafter \ifx \csname e:#1\endcsname \relax
\expandafter \def \csname c:\the\colnum\endcsname{#1}%
\expandafter \def \csname e:#1\endcsname {}%
\else
\expandafter \edef \csname c:\the\colnum\endcsname{#1:\the\colnum}%
\fi
\futurelet \nextchar \testnextchar
}
\def\testnextchar{\ifx\nextchar^^X\let\next=\ignorethirdline
\else \let\next=\scanheader
\fi \next
}
\def\ignorethirdline ^^X+-#1-+^^X{\edef\maxcolumn{\the\colnum}\runfirstitem}
\def\runfirstitem|{\colnum=0 \runitem}
\def\runitem #1 |{\advance\colnum by1
\def\tmp{#1}%
\ifx\tmp\empty \else
\expandafter \ignorefirstspace \tmp^^X%
\fi
\expandafter\edef\csname e:\csname c:\the\colnum\endcsname\endcsname{\tmp}%
\futurelet \nextchar \testnextitem
}
\expandafter \def \expandafter \ignorefirstspace \space#1^^X{\def\tmp{#1}}
\def\testnextitem{\ifx\nextchar^^X\let\next=\runline
\else \let\next=\runitem
\fi \next
}
\def\runline ^^X{\advance\numline by1
\lineaction
\futurelet \nextchar \testnextline
}
\def\testnextline{\ifx\nextchar+\let\next=\endgame
\else \let\next=\runfirstitem
\fi \next
}
\def\endgame+-#1-+^^X{\endinput}
\def\e [#1]{\expandafter\ifx \csname e: #1\endcsname \relax
\message{Warning: the #1 column is not defined in header.}%
\else \csname e: #1\endcsname \fi
}
\def\printall{\colnum = 0
\noindent \hangindent=\parindent \raggedright
\loop
\advance\colnum by1
{\seventt \ignorespaces \csname c:\the\colnum\endcsname:}\penalty0
\csname e:\csname c:\the\colnum\endcsname\endcsname
\ifnum\colnum < \maxcolumn , \repeat
.\par
}
\let\lineaction=\printall
\def\scanbase #1 {\begingroup \endlinechar=`\^^X
\def\do##1{\catcode`##1=12 }\dospecials
\catcode`\ =10 \beginhook
\expandafter \scanfirstline \input #1 \endhook \endgroup}
\let\beginhook=\relax \let\endhook=\relax
\endinput
% Makro na zpracovani databasovych vystupu z mysql pro plain
% Nacitane soubory se predpokladaji ve tvaru:
%
%
% libovolny text pred tabulkou,
% ktery bude ignorovan
% +------------+------------+----------------------------+
% | zahlavi1 | zahlavi2 | zahlavi3 ... |
% +------------+------------+----------------------------+
% | text 1,1 | text 1,2 | text 1,3 ... |
% | text 2,1 | text 2,2 | text 2,3 ... |
% | text 3,1 | text 3,2 | text 3,3 ... |
% | ... | ... | ... |
% +------------+------------+----------------------------+
%
% Na takovy soubor je mozno po
%
% \input scanbase.tex
%
% aplikovat makro \scanbase takto:
%
% \scanbase soubor
%
% Makro nacte zahlavi a zacne cist jednotlive radky. Po precteni
% kazdeho radku je obsah polozky pripraven v expanznim makru
% \e. Presneji \e[zahlavi] expanduje na text odpovidajici polozky.
% V teto situaci \scanbase spusti makro \lineaction, ktere si muze
% uzivatel definovat jak chce.
%
% Po ukonceni makra \lineaction cte scanbase dalsi radek tabulky, naplni
% znovu expanzni makra \e texty polozek z tohoto radku a spusti znovu
% \lineaction. To se opakuje tak dlouho, dokud neni ukonceno cteni
% tabulky. Navic je makru \lineaction k dispozici registr \numline
% obsahujici cislo prave precteneho radku.
%
% Priklad pouziti:
%
% \input scanbase
%
% \newcount \mylines
% \def\bb #1 #2/{\hbox to#1{#2\hss}}
%
% \def\printaction{\global\advance\mylines by1 %% \scanabase pracuje
% \hbox{% %% uvnitr skupiny!
% \bb 2em \the\numline./
% \bb 26em \e[nazev]/
% \bb 10em \e[prijmeni] \e[jmeno]/
% \bb 3em \hfill\e[kc2002]/
% \bb 3em \hfill\e[kc2001]/}
% }
% \def\lineaction{\if K\e[typ_clenstvi]% Kolektivni clenove
% \printaction
% \else \if G\e[typ_clenstvi]% Gymnazia
% \printaction
% \fi\fi % tisknu jen kolektivni cleny a gymnazia
% }
% \scanbase database1
% \scanbase database2
% {\it Number of printed lines: \the\mylines}.
% \end
%
% Pokud neni uzivatelem definovano makro \lineaction, pouzije
% scanbase sve vlastni (defaultni) makro, ktere vytiskne vsechny polozky
% jednoho radku do odstavce ve velmi zhustenem tvaru (vyzkousejte si).
%
% Kazde \scanbase vstupuje do skupiny, pak spusti \beginhook,
% pak cte hlavicku a jednotlive radky, jak bylo receno vyse,
% pak spusti \endhook a nakonec vyleze ze skupiny.
% Sekvence \beginhook a \endhook muze predefinovat uzivatel, defaltne maji
% hodnotu \relax
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