%D \module
%D   [       file=m-steps,
%D        version=2011.10.07, % 2001.05.28,
%D          title=\CONTEXT\ Modules,
%D       subtitle=Step Charts \& Tables,
%D         author=Hans Hagen,
%D           date=\currentdate,
%D      copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.

% multiple texts?

\registerctxluafile{m-steps}{}

\unprotect

\installcorenamespace {stepcharts}
\installcorenamespace {steptables}
\installcorenamespace {stepcells}
\installcorenamespace {steptexts}
\installcorenamespace {steplines}

\installsimplecommandhandler \??stepcharts {STEPchart} \??stepcharts
\installsimplecommandhandler \??steptables {STEPtable} \??steptables
\installsimplecommandhandler \??stepcells  {STEPcell}  \??stepcells
\installsimplecommandhandler \??steptexts  {STEPtext}  \??steptexts
\installsimplecommandhandler \??steplines  {STEPline}  \??steplines

\let\setupSTEPcharts\setupSTEPchart
\let\setupSTEPtables\setupSTEPtable
\let\setupSTEPcells \setupSTEPcell
\let\setupSTEPtexts \setupSTEPtext
\let\setupSTEPlines \setupSTEPline

% numeric text_text_distance ; text_text_distance   := 20pt ;
% numeric step_distance      ; step_distance        := 20pt ;

\setupSTEPcharts
  [\c!alternative=\v!horizontal,
   \c!before=\blank,
   \c!after=\blank]
%    \c!offset=.15\bodyfontsize
%    \c!height=2ex

% \setupSTEPtables
%   [\c!before=\blank,
%    \c!after=\blank,
%    \c!distance=.25em,
%    \c!voffset=1ex,
%    \c!method=1,
%    \c!width=4em,
%    \c!offset=.15\bodyfontsize]

\setupSTEPcells
  [\c!alternative=1, % TODO
%    \c!style=,
%    \c!color=,
   \c!dx=\bodyfontsize,
   \c!dy=\bodyfontsize,
   \c!background=\v!color,
   \c!backgroundcolor=STEPbackgroundcolor,
   \c!rulethickness=.1\bodyfontsize,
   \c!framecolor=STEPframecolor,
   \c!offset=.25\bodyfontsize]

\setupSTEPtexts
  [\c!alternative=1, % TODO
%    \c!style=\v!smallbodyfont,
%    \c!color=,
   \c!background=\v!color,
   \c!backgroundcolor=STEPbackgroundcolor,
   \c!rulethickness=.1\bodyfontsize,
   \c!framecolor=STEPframecolor,
   \c!distance=.5\bodyfontsize,
   \c!offset=.25\bodyfontsize]

\setupSTEPlines
  [\c!alternative=1, % TODO
   \c!rulethickness=.15\bodyfontsize,
   \c!height=3\bodyfontsize,
   \c!distance=.5\bodyfontsize,
   \c!offset=.25\bodyfontsize,
   \c!color=STEPlinecolor]

\definecolor [STEPlinecolor]       [s=.5]
\definecolor [STEPframecolor]      [s=.7]
\definecolor [STEPbackgroundcolor] [s=.9]

\newtoks\everySTEPchart

\unexpanded\def\startSTEPchart
  {\begingroup
   \dodoubleempty\module_steps_start_chart}

\def\module_steps_start_chart[#name][#settings]%
  {\startnointerference
   \iffirstargument
     \doifelseassignment{#name}
       {\let\currentSTEPchart\empty
        \xdef\module_steps_flush_chart{\module_steps_chart[][#name]}}
       {\edef\currentSTEPchart{#name}%
        \glet\module_steps_flush_chart\relax}% settings are not stored
   \else
     \let\currentSTEPchart\empty
     \gdef\module_steps_flush_chart{\module_steps_chart[][]}%
   \fi
   \the\everySTEPchart
   \ctxcommand{step_start_chart("\currentSTEPchart")}}

\unexpanded\def\stopSTEPchart
  {\ctxcommand{step_stop_chart()}%
   \stopnointerference
   \module_steps_flush_chart
   \endgroup}

\unexpanded\def\startSTEPtable
  {\begingroup
   \setupSTEPchart[\c!alternative=\v!vertical]%
   \dodoubleempty\module_steps_start_chart}

\let\stopSTEPtable\stopSTEPchart

\let\module_steps_flush_chart\relax

\unexpanded\def\STEPchart
  {\dodoubleempty\module_steps_chart}

\unexpanded\def\module_steps_chart[#name][#settings]%
  {\begingroup
   \setupSTEPchart[#settings]%
   \ifinsidefloat
     \makeSTEPchart[#name]%
   \else
     \STEPchartparameter\c!before
     \startbaselinecorrection
       \setlocalhsize
       \makeSTEPchart[#name]%
     \stopbaselinecorrection
     \STEPchartparameter\c!after
   \fi
   \endgroup}

\unexpanded\def\makeSTEPchart[#name]%
  {\ctxcommand{step_make_chart {
        chart = {
            name            = "#name",
            alternative     = "\STEPchartparameter\c!alternative",
        },
        cell = {
            alternative     = "\STEPcellparameter\c!alternative", % TODO: shapes
            offset          = \number\dimexpr\STEPcellparameter\c!offset,
            rulethickness   = \number\dimexpr\STEPcellparameter\c!rulethickness,
            framecolor      = "\STEPcellparameter\c!framecolor",
            backgroundcolor = "\STEPcellparameter\c!backgroundcolor",
            dx              = \number\dimexpr\STEPcellparameter\c!dx,
            dy              = \number\dimexpr\STEPcellparameter\c!dy,
        },
        text = {
            alternative     = "\STEPtextparameter\c!alternative", % TODO: shapes
            offset          = \number\dimexpr\STEPtextparameter\c!offset,
            distance        = \number\dimexpr\STEPtextparameter\c!distance,
            rulethickness   = \number\dimexpr\STEPtextparameter\c!rulethickness,
            framecolor      = "\STEPtextparameter\c!framecolor",
            backgroundcolor = "\STEPtextparameter\c!backgroundcolor",
        },
        line = {
            alternative     = "\STEPlineparameter\c!alternative", % TODO: dash, arrow
            rulethickness   = \number\dimexpr\STEPlineparameter\c!rulethickness,
            height          = \number\dimexpr\STEPlineparameter\c!height,
            distance        = \number\dimexpr\STEPlineparameter\c!distance,
            offset          = \number\dimexpr\STEPlineparameter\c!offset,
            color           = "\STEPlineparameter\c!color",
        },
   }}}

\unexpanded\def\startSTEPcell
  {\ctxcommand{step_start_cell()}}

\unexpanded\def\stopSTEPcell
  {\ctxcommand{step_stop_cell()}}

\unexpanded\def\module_steps_cells#top#bot%
  {\ctxcommand{step_cells(\!!bs\detokenize{#top}\!!es,\!!bs\detokenize{#bot}\!!es)}}

\unexpanded\def\module_steps_texts#top#bot%
  {\ctxcommand{step_texts(\!!bs\detokenize{#top}\!!es,\!!bs\detokenize{#bot}\!!es)}}

\unexpanded\def\module_steps_cell#str%
  {\ctxcommand{step_cell(\!!bs\detokenize{#str}\!!es)}}

\unexpanded\def\module_steps_text#str%
  {\ctxcommand{step_text(\!!bs\detokenize{#str}\!!es)}}

\unexpanded\def\module_steps_textset#left#middle#right%
  {\ctxcommand{step_textset(\!!bs\detokenize{#left}\!!es,\!!bs\detokenize{#middle}\!!es,\!!bs\detokenize{#right}\!!es)}}

\unexpanded\def\module_steps_toptext#top%
  {\ctxcommand{step_text_top(\!!bs\detokenize{#top}\!!es)}}

\unexpanded\def\module_steps_bottext#bot%
  {\ctxcommand{step_text_bot(\!!bs\detokenize{#bot}\!!es)}}

\unexpanded\def\module_steps_topcell#top%
  {\ctxcommand{step_cell_top(\!!bs\detokenize{#top}\!!es)}}

\unexpanded\def\module_steps_botcell#bot%
  {\ctxcommand{step_cell_bot(\!!bs\detokenize{#bot}\!!es)}}

\appendtoks
    \let\cells  \module_steps_cells
    \let\texts  \module_steps_texts
    \let\cell   \module_steps_cell
    \let\text   \module_steps_text
    \let\textset\module_steps_textset
    \let\toptext\module_steps_toptext
    \let\bottext\module_steps_bottext
    \let\topcell\module_steps_topcell
    \let\botcell\module_steps_botcell
\to \everySTEPchart

% todo: mapping can be done in lua

\startxmlsetups xml:step:define
    \xmlsetsetup{#1} {stepchart|steptable} {xml:step:*}
\stopxmlsetups

\xmlregistersetup{xml:step:define}

\startxmlsetups xml:step:stepchart
    \startSTEPchart
        \xmlfilter{#1}{/(cells|texts|stepcell|cell|text)/command(xml:step:*)}
    \stopSTEPchart
\stopxmlsetups

\startxmlsetups xml:step:steptable
    \startSTEPtable
        \xmlfilter{#1}{/(cells|texts|stepcell|cell|text)/command(xml:step:*)}
    \stopSTEPtable
\stopxmlsetups

\startxmlsetups xml:step:cells
    \cells {\xmltext{#1}{/top}} {\xmltext{#1}{/bot}}
\stopxmlsetups

\startxmlsetups xml:step:texts
    \texts {\xmltext{#1}{/top}} {\xmltext{#1}{/bot}}
\stopxmlsetups

\startxmlsetups xml:step:stepcell
    \cells {\xmltext{#1}{/topcell}} {\xmltext{#1}{/botcell}}
    \texts {\xmltext{#1}{/toptext}} {\xmltext{#1}{/bottext}}
\stopxmlsetups

\startxmlsetups xml:step:cell
    \cell {\xmlflush{#1}}
\stopxmlsetups

\startxmlsetups xml:step:text
    \text {\xmlflush{#1}}
\stopxmlsetups

\protect

\continueifinputfile{m-steps.mkvi}

\starttext

\startbuffer
<stepchart>
  <cell> some cell </cell>
  <text> some text </text>
  <cell> some cell </cell>
  <text> some text </text>
  <cell> some cell </cell>
</stepchart>
\stopbuffer

\typebuffer \processxmlbuffer


\startbuffer
<steptable>
  <cell> some cell </cell>
  <text> some text </text>
  <cell> some cell </cell>
  <text> some text </text>
  <cell> some cell </cell>
</steptable>
\stopbuffer

\typebuffer \processxmlbuffer

\page

\startSTEPchart
    \cells {A}     {B}
    \cells {one}   {five}  \texts{$+2$}{$-2$}
    \cells {two}   {four}  \texts{$+3$}{$-3$}
    \cells {three} {three} \texts{$+4$}{$-4$}
    \cells {four}  {two}   \texts{$+5$}{$-5$}
    \cells {five}  {one}
\stopSTEPchart

\startSTEPtable
    \cell {one}   \textset{$x$}  {=}{$a+b+c$}
    \cell {two}   \textset{$c+d$}{=}{$y$}
    \cell {three}
\stopSTEPtable


\page

\startbuffer
<stepchart>
  <cells> <top> some text </top> <bot> some text </bot> </cells>
  <texts> <top> text      </top> <bot> text      </bot> </texts>
  <cells> <top> some text </top> <bot> some text </bot> </cells>
</stepchart>
\stopbuffer

\processxmlbuffer

\startbuffer
<stepchart>
  <cell> some text </cell>
  <texts> <top> text </top> <bot> text </bot> </texts>
  <cell> some text </cell>
</stepchart>
\stopbuffer

\processxmlbuffer

\page

\startSTEPchart[second]
    \startSTEPcell
        \topcell {A}
        \botcell {B}
    \startSTEPcell
        \topcell {one}
        \botcell {five}
        \toptext {$+2$}
        \bottext {$-2$}
    \stopSTEPcell
    \startSTEPcell
        \topcell {two}
        \botcell {four}
        \toptext {$+3$}
        \bottext {$-3$}
    \stopSTEPcell
    \startSTEPcell
        \topcell {three}
        \botcell {three}
        \toptext {$+4$}
        \bottext {$-4$}
    \stopSTEPcell
    \startSTEPcell
        \topcell {four}
        \botcell {two}
        \toptext {$+5$}
        \bottext {$-5$}
    \stopSTEPcell
    \startSTEPcell
        \topcell {five}
        \botcell {one}
    \stopSTEPcell
\stopSTEPchart

\STEPchart[first][alternative=horizontal]
\STEPchart[first][alternative=vertical]

\page

\STEPchart[second][alternative=horizontal]
\STEPchart[second][alternative=vertical]

\page

\stoptext