<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">%
% tab-form.sty
%
% This is part of the TeSLa package that is the subject of the paper
% entitled "An Example Special Purpose Input Language to LaTeX" that
% was (will be) presented to the TUG94 conference in Santa Barabara.
%
% Please see tesla.sty for more details.
% ======================================
%

%
% Customization Required for [tvar.
% =================================
%
% The tabular form is the first "form" used by TeSLa.  That is, the
% English form (the second "form") is ignored when the tabular form is
% used.  This is implemented with the \xform command, whose arguments 
% are:
%	   #1 -	The tabular form
%	   #2 - The English form; IGNORED in this style
%
% See the "The [tvar command" subsection of "The Implementation" section
% in the paper for more details.
%
\gdef\xform#1#2{#1}

%
% Customization Required for [tgroup.
% ===================================
%
% The \xbegin command defines the TeX formatting to be inserted at the 
% begining of a group of rules.  Its arguments are:
%	   #1 - TeX command to be used for the \trule command
%	   #2 - the number of KB-conditions in each rule
%	   #3 - the number of columns in the table (#2 + 1)
%	   #4 - the width of each column
%	   #5 - the title for the group of rules
% In this tabular form, we create a table using the LaTeX tabular 
% environment.  Note that a fancier tabular style, such as one that 
% handle page breaks gracefully could be used instead.
%
% The \sep command defines the TeX formatting to be inserted to add 
% some extra separation between subgroups of a group of rules.  In
% this tabular form, it inserts a horizontal line in the table.
%
% The \xend command defines the TeX formatting to be inserted at the 
% end of a group of rules.  In this tabular form, it closes the LaTeX 
% tabular environment.
%
% See the "The [tgroup command" subsection of "The Implementation" section
% in the paper for more details.
%
\gdef\xbegin#1#2#3#4#5{
    \gdef\trule{\csname #1\endcsname}
    \gdef\numcols{#3}
    \par\begin{tabular}{*{#3}{|p{#4\textwidth}}|}
    \hline
    \multicolumn{#3}{|c|}{\rule{0pt}{2.8ex}\large\bf #5 Rules}\\
    \hline
    \multicolumn{#2}{|c|}{\rule{0pt}{2.8ex}\large Conditions}
        &amp; \large Conclu\-sion \\
    \hline\hline
    }
\gdef\xsep{\hline}
\gdef\xend{\hline\end{tabular}}

%
% Customization Required for [trule.
% ==================================
%
% The \xpre command defines the TeX formatting to be inserted for an
% empty KB-condition.  In this tabular form, it inserts a column
% separator (&amp;).
%
% The \xif command defines the TeX formatting to be inserted for the
% first non-empty KB-condition.  It takes one argument:
%	   #1 -	The first non-empty KB-condition
% In this tabular form, it inserts the TeX codes to be "very relaxed"
% about formatting (particularly in narrow columns) and the 
% KB-condition.
%
% The \xand command defines the TeX formatting to be inserted for the 
% rest of the KB-conditions.  It takes one argument:
%          #1 - The KB-condition
% In this tabular form, it inserts the TeX codes to be "very relaxed"
% about formatting (particularly in narrow columns) and the
% KB-condition, if it is non-empty.
%
% The \xthen command defines the TeX formatting to be inserted for the
% KB-consequence.  It takes one argument:
%          #1 - The KB-consequence
% In this tabular form, it inserts the column separator (&amp;), the TeX codes
% to be "very relaxed" about formatting (particularly in narrow columns)
% the KB-consequence and the row terminator (\\).
%
% See the "The [trule command" subsection of "The Implementation" section
% in the paper for more details.
%
\gdef\xpre{&amp;}
\gdef\xif#1{\RS\xrel #1}
\gdef\xand#1{&amp; \RS\ifx#1\empty\else\xrel #1\fi}
\gdef\xthen#1{&amp; \PBS\RS\xrel #1 \\}

%
% Customization Required for [ttext and [trem.
% ============================================
%
% The \xtext command defines the TeX formatting to be inserted for 
% arbitrary explanatory text.  It takes one argument:
%          #1 - The explantory text
% In this tabular form, it prints the text---in italics---spanned across
% all the columns.
%
% The \xrem command defines the TeX formatting to be inserted for 
% extra explanatory text into the tabular form.  It takes one argument:
%          #1 - The extra explantory text
% In this tabular form, it prints the text like \ttext, except the text
% is printed in SmallCaps.
%
\gdef\xtext#1{\multicolumn{\numcols}{|p{.9\textwidth}|}{\em #1}\\
              \hline}
\gdef\xrem#1{\xtext{\sc #1}}

%
% Support commands.
% =================
%
% The \RS command is the TeX code to be "very relaxed" about formatting;
% see The LaTeX Companion, page 132 (for \hspace{0pt})
% 
% The \PBS command is an abbreviation for the \PreserveBackslash command
% which allows us to bend the rules about where the LaTeX tabular row
% terminator (\\) must be placed (ie. in a command which does not contain 
% the whole row); see The LaTeX Companion, page 108
%
\gdef\RS{\raggedright\sloppy\hspace{0pt}}
\gdef\PreserveBackslash#1{\let\temp=\\#1\let\\=\temp}
\let\PBS=\PreserveBackslash
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