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% File:       TeX Inputs Cell4.tex
% Author:     J E Pittman
% Bitnet:     JEPTeX@TAMVenus
% Internet:   JEPTeX@Venus.TAMU.EDU
% Date:       November 8, 1988
%
% Set up to output the data.
%
\catcode`_=11 % Protect local control sequence names.
%
% The user supplied information about the column has already been 
% processed.
%
\def\column #1{\relax\ignorespaces}%
%
\row_number=0
\rowpenalty=0
%
% This routine is used for horizontal kerning when there might be a 
% kern to the left of the current position.
%
\def\move_right_via_lastkern #1{\relax
   \temp_dimen=#1\relax
   \ifdim \lastkern>\zeropt
      \advance \temp_dimen \by \lastkern
      \unkern
   \else
   \fi
   \kern \temp_dimen
   }%
%
% \row begins a row by getting its specifications, terminating the 
% previous row (if any) and going into horizontal mode.
%
\def\row #1{\relax
   \advance \row_number \by 1
   \everyrow
   \get_row_number_data
   \advance \rowheight \by \expansion
   \ifdim \bottomrulewidth>\zeropt
      \advance \bottomrulewidth \by \horizontal_rule_adjust
   \fi
   \column_number=0
   \par
   \ifnum \rowpenalty=0
   \else
      \penalty \rowpenalty
      \rowpenalty=0
   \fi
   \noindent
   \ignorespaces
   \message{Outputting row \the\row_number.}%
   }%
%
% \blank creates a blank cell by kerning the appropriate amount.
%
\def\blank {\relax
   \advance \column_number \by 1
   \everycolumn
   \get_column_number_data
   \advance \columnwidth \by \expansion
   \advance \merge_width \by \expansion
   \move_right_via_lastkern \merge_width
%
% Terminate merger(s).
%
   \merge_width=\zeropt
   \merge_columns=0
   \ifnum \merge_rows>0
      \add_column_number_data
            {\merge_rows=0\relax\merge_height=\zeropt\relax}%
   \fi
   }%
%
% \cell outputs a cell.  The components of the cell are (in the order 
% output) the entry, the top ruler, the bottom ruler, and the left and 
% right rulers.
%
\def\cell #1{\relax
   \advance \column_number \by 1
   \everycolumn
   \get_column_number_data
   \advance \columnwidth \by \expansion
   \advance \merge_height \by \rowheight
   \advance \merge_width \by \columnwidth
   \ifdim \leftrulewidth>\zeropt
      \advance \leftrulewidth \by \vertical_rule_adjust
   \fi
   \ifdim \rightrulewidth>\zeropt
      \advance \rightrulewidth \by \vertical_rule_adjust
   \fi
%
% Get the correct top border skip and rule width.  Note that it is 
% necessary to extract this informaion even if a row merger is not 
% present because a previous row merger might have left the wrong 
% values.
%
   \begingroup
      \advance \row_number \by -\merge_rows
      \everyrow
      \get_row_number_data
      \xdef\globaltemp{\topborderskip=\the\topborderskip\relax
         \toprulewidth=\the\toprulewidth\relax
         }%
      \aftergroup \globaltemp
      \endgroup
   \ifdim \toprulewidth>\zeropt
      \advance \toprulewidth \by \horizontal_rule_adjust
   \fi
%
% Same procedure for the left border skip and rule width except that 
% extraction is necessary only in the presense of a column merger due 
% to the execution of an every column and a get at the start of \cell.  
%
   \ifnum \merge_columns>0
      \begingroup
         \advance \column_number \by -\merge_columns
         \everycolumn
         \get_column_number_data
         \xdef\globaltemp{\leftrulewidth=\the\leftrulewidth\relax
            \leftborderskip=\the\leftborderskip\relax
            }%
         \aftergroup \globaltemp
         \endgroup
      \ifdim \leftrulewidth>\zeropt
         \advance \leftrulewidth \by \vertical_rule_adjust
      \fi
   \fi
%
% Typeset the entry into temp box horizontally first, trying kerns 
% before glue in case the cell does not require horizontal stretching 
% and taking advantage of an empty cell by doing nothing, if such is 
% the case.
%
   \setbox\temp_box=\hbox{#1}%
   \ifdim\wd\temp_box>\zeropt
      \setbox\temp_box=\hbox \bgroup
         \kern \leftborderskip
         \box\temp_box
         \egroup
      \temp_dimen=\wd\temp_box
      \advance\temp_dimen \by \rightborderskip
      \wd\temp_box=\temp_dimen
%
      \ifdim\wd\temp_box=\merge_width
%
% then the kerns can be used instead of skips.
%
      \else
         \setbox\temp_box=\hbox \to \merge_width \bgroup
            \hskip \leftborderskip
            #1%
            \hskip \rightborderskip
            \egroup
      \fi
%
% Hide the width of temp box and put a phantom into it the hard way.
%
      \wd\temp_box=\zeropt
      \setbox\scratch_box=\hbox{#1)}%
      \ifdim \dp\scratch_box>\dp\temp_box
         \dp\temp_box=\dp\scratch_box
      \fi
      \ifdim \ht\scratch_box>\ht\temp_box
         \ht\temp_box=\ht\scratch_box
      \fi
%
      \temp_dimen=\ht\temp_box
      \advance \temp_dimen \by \dp\temp_box
      \advance \temp_dimen \by \bottomborderskip
      \advance \temp_dimen \by \topborderskip
      \ifdim \temp_dimen=\merge_height
%
% then the entry can be positioned vertically via a raise statement.  
% The total height of the material output should be equal to the row 
% height, thus acting as a strut.
%
         \temp_dimen=\bottomborderskip
         \advance \temp_dimen \by \dp\temp_box
         \scratch_dimen=\rowheight
         \advance\scratch_dimen by -\temp_dimen
         \ht\temp_box=\scratch_dimen
         \raise \temp_dimen \box\temp_box
      \else % have to do it via a box
         \setbox\temp_box=\vbox \to \rowheight \bgroup
%
% Subtracting merge height - row height from top border skip allows 
% the cell to stick up into the next row by an appropriate amount.
%
            \advance \topborderskip \by \rowheight
            \advance \topborderskip \by -\merge_height
            \vskip \topborderskip
            \box\temp_box
            \vskip \bottomborderskip
            \egroup
         \box\temp_box
      \fi
   \fi
%
% All of the rules are typeset with an overlap of at least pixel width 
% which insures that there will be no gaps.
%
% Typeset the top rule into an hbox and use a raise statement to put 
% it into position.
%
   \ifdim \toprulewidth>\zeropt
      \setbox\temp_box=\hbox \bgroup
         \temp_dimen=\merge_width
         \ifdim \half\leftrulewidth<\pixelwidth
            \kern -\pixelwidth
         \else
            \kern -\half\leftrulewidth
         \fi
         \advance \temp_dimen \by -\lastkern
         \vrule \height \half\toprulewidth
                \depth  \half\toprulewidth
                \width  \temp_dimen
         \ifdim \half\rightrulewidth<\pixelwidth
            \temp_dimen=\pixelwidth
         \else
            \temp_dimen=\half\rightrulewidth
         \fi
         \kern -\temp_dimen
         \vrule \height \half\toprulewidth
                \depth  \half\toprulewidth
                \width  2\temp_dimen
         \egroup
      \wd\temp_box=\zeropt
      \temp_dimen=\rowheight
      \advance\temp_dimen \by -\merge_height
      \ht\temp_box=\temp_dimen
      \dp\temp_box=\merge_height
      \raise \merge_height \box\temp_box
   \fi
%
% Output the bottom rule using the same methods.
%
   \ifdim \bottomrulewidth>\zeropt
      \setbox\temp_box=\hbox \bgroup
         \temp_dimen=\merge_width
         \ifdim \half\leftrulewidth<\pixelwidth
            \kern -\pixelwidth
         \else
            \kern -\half\leftrulewidth
         \fi
         \advance \temp_dimen \by -\lastkern
         \vrule \height \half\bottomrulewidth
                \depth  \half\bottomrulewidth
                \width  \temp_dimen
         \ifdim \half\rightrulewidth<\pixelwidth
            \temp_dimen=\pixelwidth
         \else
            \temp_dimen=\half\rightrulewidth
         \fi
         \kern -\temp_dimen
         \vrule \height \half\bottomrulewidth
                \depth  \half\bottomrulewidth
                \width  2\temp_dimen
         \egroup
      \wd\temp_box=\zeropt
      \dp\temp_box=\zeropt
      \ht\temp_box=\rowheight
      \box\temp_box
   \fi
%
% Test to see if the left inclusive-or right rule width is non-zero.
%
   \ifdim \leftrulewidth=\zeropt
      \temp_dimen=\rightrulewidth
   \else
      \temp_dimen=\leftrulewidth
   \fi
   \ifdim \temp_dimen>\zeropt
      \setbox\temp_box=\hbox \bgroup
         \temp_dimen=\merge_height
         \advance \merge_height \by \pixelwidth
         \ifdim \leftrulewidth>\zeropt
            \kern -\half\leftrulewidth
            \vrule \height \temp_dimen
                   \depth  \pixelwidth
                   \width  \leftrulewidth
         \fi
         \ifdim \rightrulewidth>\zeropt
            \scratch_dimen=\merge_width
            \advance \scratch_dimen \by -\half\leftrulewidth
            \advance \scratch_dimen \by -\half\rightrulewidth
            \kern \scratch_dimen
            \vrule \height \temp_dimen
                   \depth  \pixelwidth
                   \width  \rightrulewidth
         \fi
         \egroup
      \wd\temp_box=\merge_width
      \ht\temp_box=\rowheight
      \dp\temp_box=\zeropt
      \box\temp_box
   \else
      \move_right_via_lastkern \merge_width
   \fi
%
% Cancel the mergers.
%
   \merge_width=\zeropt
   \merge_columns=0
   \ifnum \merge_rows>0
      \add_column_number_data
            {\merge_rows=0\relax\merge_height=\zeropt\relax}%
   \fi
   \ignorespaces
   }%
%
% No surprises here.
%
\def\mergeright {\relax
   \advance \column_number \by 1
   \everycolumn
   \get_column_number_data
   \advance \columnwidth \by \expansion
   \advance \merge_width \by \columnwidth
   \advance \merge_columns \by 1
   \ifnum \merge_rows>0
      \add_column_number_data
            {\merge_rows=0\relax\merge_height=\zeropt\relax}%
   \fi
   }%
%
% No surprises here.
%
\def\mergedown {\relax
   \advance \column_number \by 1
   \everycolumn
   \get_column_number_data
   \advance \columnwidth \by \expansion
   \advance \merge_width \by \columnwidth
   \move_right_via_lastkern \merge_width
   \merge_width=\zeropt
   \merge_columns=0
   \advance \merge_height \by \rowheight
   \let\info=\relax
   \edef\temp{\the\column_number>\info
         {\merge_height=\the\merge_height\relax
         \advance\merge_rows \by 1\relax}}%
   \let\info=\column_info
   \x_after \add_data \temp
   \rowpenalty=10000 % do not allow a break over a row merge.
   }%
%
\catcode`_=8 % Back to normal.
%
\def\noalign#1{\relax
   \vadjust{#1}%
   \ignorespaces
   }%
%
\endinput
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