%D \module
%D   [     file=t-algorithmic,
%D      version=2012.12.18,
%D        title=\CONTEXT\ User Module,
%D     subtitle=Algorithms,
%D       author=Wolfgang Schuster,
%D         date=\currentdate,
%D    copyright=Wolfgang Schuster,
%D        email=schuster.wolfgang@googlemail.com,
%D      license=GNU General Public License]

%C Copyright (C) 2010  Wolfgang Schuster
%C
%C This program is free software: you can redistribute it and/or modify
%C it under the terms of the GNU General Public License as published by
%C the Free Software Foundation, either version 3 of the License, or
%C any later version.
%C
%C This program is distributed in the hope that it will be useful,
%C but WITHOUT ANY WARRANTY; without even the implied warranty of
%C MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
%C GNU General Public License for more details.
%C
%C You should have received a copy of the GNU General Public License
%C along with this program.  If not, see <http://www.gnu.org/licenses/>.

% begin info
%
% title   : algorithmic
% comment : context port of the algorithmic package for latex
% status  : final
%
% end info

\writestatus{loading}{Context User Module / Algorithms}

\unprotect

\startinterface all
  \setinterfaceconstant {labelstyle} {labelstyle}
  \setinterfaceconstant {labelcolor} {labelcolor}
\stopinterface

\startinterface all
  \setinterfacevariable {algorithmic} {algorithmic}
\stopinterface

\installnamespace                       {algorithmic}
\installcommandhandler \????algorithmic {algorithmic} \????algorithmic

\appendtoks
  \setuevalue{\e!start\currentalgorithmic}{\algorithmic_start[\currentalgorithmic]}%
  \setuevalue{\e!stop \currentalgorithmic}{\algorithmic_stop                      }%
\to \everydefinealgorithmic

\appendtoks
  \definelinenumbering[\currentalgorithmic]%
\to \everydefinealgorithmic

\appendtoks
  \setuplinenumbering
    [\currentalgorithmic]
    [\c!conversion=\algorithmicparameter\c!conversion,
          \c!start=\algorithmicparameter\c!start,
           \c!step=\algorithmicparameter\c!step,
         \c!method=\algorithmicparameter\c!method,
       \c!continue=\algorithmicparameter\c!continue,
       \c!location=\algorithmicparameter\c!location,
          \c!style=\algorithmicparameter\c!numberstyle,
          \c!color=\algorithmicparameter\c!numbercolor,
          \c!width=\algorithmicparameter\c!numberwidth,
          \c!align=\algorithmicparameter\c!align]%
\to \everysetupalgorithmic

\unexpanded\def\algorithmic_start[#1]%
  {\begingroup
   \edef\currentalgorithmic{#1}%
   \dosingleempty\algorithmic_start_indeed}

\def\algorithmic_start_indeed[#1]%
  {\iffirstargument
     \setupcurrentalgorithmic[#1]%
   \fi
   \the\t_algorithmic_commands
   \usealgorithmicstyleandcolor\c!style\c!color
   \doifsomething{\algorithmicparameter\c!spacebefore}{\blank[\algorithmicparameter\c!spacebefore]}%
   \algorithmicparameter\c!before
   \setupwhitespace[\v!none]%
   \doadaptleftskip{\algorithmicparameter\c!margin}%
   \doif{\algorithmicparameter\c!numbering}\v!yes\startlinenumbering}

\unexpanded\def\algorithmic_stop
  {\par
   \doif{\algorithmicparameter\c!numbering}\v!yes\stoplinenumbering
   \algorithmicparameter\c!after
   \doifsomething{\algorithmicparameter\c!spaceafter}{\blank[\algorithmicparameter\c!spaceafter]}%
   \endgroup}

% Commands

\def\algorithmic_begsub
  {\par\doadaptleftskip{\algorithmicparameter\c!width}}

\def\algorithmic_endsub
  {\par\doadaptleftskip{-\algorithmicparameter\c!width}}

\def\algorithmic_label#1%
  {\begingroup
   \usealgorithmicstyleandcolor\c!labelstyle\c!labelcolor
   \algorithmictext{#1}%
   \endgroup}

\starttexdefinition algorithmic_state
  \par
\stoptexdefinition

\starttexdefinition algorithmic_if #1
  \par
  \algorithmic_label{if} #1 \algorithmic_label{then}
  \algorithmic_begsub
\stoptexdefinition

\starttexdefinition algorithmic_else
  \algorithmic_endsub
  \algorithmic_label{else}
  \algorithmic_begsub
\stoptexdefinition

\starttexdefinition algorithmic_elsif #1
  \algorithmic_endsub
  \algorithmic_label{elsif} #1 \algorithmic_label{then}
  \algorithmic_begsub
\stoptexdefinition

\starttexdefinition algorithmic_endif
  \algorithmic_endsub
  \algorithmic_label{endif}
\stoptexdefinition

\starttexdefinition algorithmic_for #1
  \par
  \algorithmic_label{for} #1 \algorithmic_label{do}
  \algorithmic_begsub
\stoptexdefinition

\starttexdefinition algorithmic_forall #1
  \par
  \algorithmic_label{forall} #1 \algorithmic_label{do}
  \algorithmic_begsub
\stoptexdefinition

\starttexdefinition algorithmic_endfor
  \algorithmic_endsub
  \algorithmic_label{endfor}
\stoptexdefinition

\starttexdefinition algorithmic_while #1
  \par
  \algorithmic_label{while} #1 \algorithmic_label{do}
  \algorithmic_begsub
\stoptexdefinition

\starttexdefinition algorithmic_endwhile
  \algorithmic_endsub
  \algorithmic_label{endwhile}
\stoptexdefinition

\starttexdefinition algorithmic_repeat
  \par
  \algorithmic_label{repeat}
  \algorithmic_begsub
\stoptexdefinition

\starttexdefinition algorithmic_until #1
  \algorithmic_endsub
  \algorithmic_label{until} #1
\stoptexdefinition

\starttexdefinition algorithmic_loop
  \par
  \algorithmic_label{loop}
  \algorithmic_begsub
\stoptexdefinition

\starttexdefinition algorithmic_endloop
  \algorithmic_endsub
  \algorithmic_label{endloop}
\stoptexdefinition

\starttexdefinition algorithmic_require
  \par
  \algorithmic_label{require}
  \space
\stoptexdefinition

\starttexdefinition algorithmic_ensure
  \par
  \algorithmic_label{ensure}
  \space
\stoptexdefinition

\starttexdefinition algorithmic_return
  \par
  \algorithmic_label{return}
  \space
\stoptexdefinition

\starttexdefinition algorithmic_true
  \algorithmic_label{true}
\stoptexdefinition

\starttexdefinition algorithmic_false
  \algorithmic_label{false}
\stoptexdefinition

\starttexdefinition algorithmic_print
  \par
  \algorithmic_label{print}
  \space
\stoptexdefinition

\starttexdefinition algorithmic_comment #1
  \textbraceleft
    #1
  \textbraceright
\stoptexdefinition

% The commands in the environment are all uppercase, the connection
% between them and their defintion happens here.

\newtoks\t_algorithmic_commands

\def\algorithmic_define
  {\dodoubleargument\algorithmic_define_indeed}

\def\algorithmic_define_indeed[#1][#2]%
  {\appendtoks\letvalue{#1}#2\to\t_algorithmic_commands}

\algorithmic_define [STATE]    [\algorithmic_state   ]
\algorithmic_define [IF]       [\algorithmic_if      ]
\algorithmic_define [ELSE]     [\algorithmic_else    ]
\algorithmic_define [ELSIF]    [\algorithmic_elsif   ]
\algorithmic_define [ENDIF]    [\algorithmic_endif   ]
\algorithmic_define [FOR]      [\algorithmic_for     ]
\algorithmic_define [FORALL]   [\algorithmic_forall  ]
\algorithmic_define [ENDFOR]   [\algorithmic_endfor  ]
\algorithmic_define [WHILE]    [\algorithmic_while   ]
\algorithmic_define [ENDWHILE] [\algorithmic_endwhile]
\algorithmic_define [REPEAT]   [\algorithmic_repeat  ]
\algorithmic_define [UNTIL]    [\algorithmic_until   ]
\algorithmic_define [LOOP]     [\algorithmic_loop    ]
\algorithmic_define [ENDLOOP]  [\algorithmic_endloop ]
\algorithmic_define [REQUIRE]  [\algorithmic_require ]
\algorithmic_define [ENSURE]   [\algorithmic_ensure  ]
\algorithmic_define [RETURN]   [\algorithmic_return  ]
\algorithmic_define [TRUE]     [\algorithmic_true    ]
\algorithmic_define [FALSE]    [\algorithmic_false   ]
\algorithmic_define [PRINT]    [\algorithmic_print   ]
\algorithmic_define [COMMENT]  [\algorithmic_comment ]

% Labels

\definelabelclass[algorithmic]

\setupalgorithmictext[\s!en][require=Require:]
\setupalgorithmictext[\s!en][ensure=Ensure:]
\setupalgorithmictext[\s!en][end=end]
\setupalgorithmictext[\s!en][if=if]
\setupalgorithmictext[\s!en][then=then]
\setupalgorithmictext[\s!en][else=else]
\setupalgorithmictext[\s!en][elsif=else if]
\setupalgorithmictext[\s!en][endif=end if]
\setupalgorithmictext[\s!en][for=for]
\setupalgorithmictext[\s!en][forall=for all]
\setupalgorithmictext[\s!en][do=do]
\setupalgorithmictext[\s!en][endfor=end for]
\setupalgorithmictext[\s!en][while=while]
\setupalgorithmictext[\s!en][endwhile=end while]
\setupalgorithmictext[\s!en][loop=loop]
\setupalgorithmictext[\s!en][endloop=end loop]
\setupalgorithmictext[\s!en][repeat=repeat]
\setupalgorithmictext[\s!en][until=until]
\setupalgorithmictext[\s!en][print=print]
\setupalgorithmictext[\s!en][return=return]
\setupalgorithmictext[\s!en][true=true]
\setupalgorithmictext[\s!en][false=false]

% Default values

\definealgorithmic[\v!algorithmic]

\setupalgorithmic
  [  \c!numbering=\v!no,      % linenumbering
    \c!conversion=\v!numbers, % linenumbering
         \c!start=1,          % linenumbering
          \c!step=1,          % linenumbering
        \c!method=\v!first,   % linenumbering
      \c!continue=\v!no,      % linenumbering
      \c!location=\v!left,    % linenumbering
   \c!numberstyle=,           % linenumbering
   \c!numbercolor=,           % linenumbering
   \c!numberwidth=2em,        % linenumbering
         \c!align=\v!auto,    % linenumbering
         \c!width=1em,
        \c!margin=1em,
    \c!labelstyle=\v!bold,
        \c!before=,
         \c!after=,
   \c!spacebefore=\v!line,
    \c!spaceafter=\v!line]

\protect \endinput
