%D \module
%D   [       file=core-buf, % blocks are moved to core-blk
%D        version=2000.01.05,
%D          title=\CONTEXT\ Core Macros,
%D       subtitle=Buffers,
%D         author=Hans Hagen,
%D           date=\currentdate,
%D      copyright={PRAGMA / Hans Hagen \& Ton Otten}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.

\unprotect

\def\mkresetbuffer
  {\unlinkfile{\TEXbufferfile\currentbuffer}}

\long\def\mksetbuffer#1%
  {\edef\bufferfilename{\TEXbufferfile{\currentbuffer}}%
   \immediate\openout\tmpblocks\bufferfilename
   \convertargument#1\to\ascii
   \immediate\write\tmpblocks{\ascii}%
   \immediate\closeout\tmpblocks}

\def\mkstartbuffer#1#2#3#4#5% ook grabben a la mkiv / no, we need to add par anchors
  {\doifelsenothing{#4}
     {\letbeundefined{\e!stop\v!buffer}% % \let\stopbuffer=\relax   % \undefined
      \@EA\@EA\@EA\convertargument\@EA\e!start\v!buffer\to\beginofblock % else a space
      \@EA\@EA\@EA\convertargument\@EA\e!stop \v!buffer\to\endofblock
      \ifcase\buffernestmode
        \let\processnextbufferline\processnextbufferlineB
      \else
        \let\processnextbufferline\processnextbufferlineA
      \fi}
     {\letbeundefined{#4}% \letvalue{#4}=\relax     % \undefined
      \@EA\convertargument\csname#3\endcsname\to\beginofblock
      \@EA\convertargument\csname#4\endcsname\to\endofblock
      \ifcase\buffernestmode
          \let\processnextbufferline\processnextbufferlineB
        \or
          \let\processnextbufferline\processnextbufferlineB
        \else
          \let\processnextbufferline\processnextbufferlineA
      \fi}%
   \def\closebufferfile
     {\ifsegmentatebuffer
        \immediate\write\tmpblocks{\string\stopbufferparagraph}%
      \fi
      \immediate\closeout\tmpblocks
      #5% \egroup
      \getvalue{#4}}%
   \doifelsenothing{#2}
     {\edef\bufferfilename{\TEXbufferfile\jobname}}%
     {\edef\bufferfilename{\TEXbufferfile{#2}}}%
   \immediate\openout\tmpblocks\bufferfilename
   \ifsegmentatebuffer
     \immediate\write\tmpblocks{\string\startbufferparagraph}%
   \fi
   \newcounter\nestedbufferlevel
   \recatcodeuppercharacterstrue
   \setcatcodetable\vrbcatcodes
   \obeylines
   \copybufferline}

\def\mkdobuffer#1% command
  {\beginrestorecatcodes
   #1%
   \endrestorecatcodes}

\def\mkgetbuffer {\readjobfile{\TEXbufferfile{\currentbuffer}}\donothing\donothing}
\def\mktypebuffer{\typefile{\TEXbufferfile{\currentbuffer}}}

% support macros

\expandafter \convertargument \gobbleoneargument @ \to \emptybufferline

\ifx\tmpblocks\undefined \newwrite\tmpblocks \fi

\newif\iftmpblockstarted

\def\flushbufferline#1%
  {\iftmpblockstarted
     \ifsegmentatebuffer
       \ifemptybufferline
         \immediate\write\tmpblocks{\string\stopbufferparagraph }%
         \immediate\write\tmpblocks{\string\startbufferparagraph}%
       \else
         \immediate\write\tmpblocks{#1}%
       \fi
     \else
       \immediate\write\tmpblocks{#1}%
     \fi
   \else
     \doifsomething{#1}
       {\tmpblockstartedtrue
        \immediate\write\tmpblocks{\string#1}}%
   \fi}

\long\def\processnextbufferlineA#1%
  {\relax % checken waarom eerdere macro dit nodig heeft / supp-mps run
   \convertargument#1 \to\next
   \doifinstringelse{\delcharacter\letterpercent}{\delcharacter\next}
     {\secondoftwoarguments}
     {\doifincsnameelse\endofblock\next
        {\ifnum\nestedbufferlevel=\zerocount
           \expandafter\firstoftwoarguments
         \else
           \decrement\nestedbufferlevel\relax
           \expandafter\secondoftwoarguments
         \fi}
        {\doifincsnameelse\beginofblock\next
           {\increment\nestedbufferlevel\relax
            \secondoftwoarguments}
           {\secondoftwoarguments}}}}

\long\def\processnextbufferlineB#1% #2#3%
  {\convertargument#1 \to\next
   \ifx\next\emptybufferline
     \ifsegmentatebuffer \emptybufferlinetrue \fi
     \expandafter\secondoftwoarguments% #3%
   \else
     \emptybufferlinefalse
     \doifinstringelse\endofblock\next
       {\expandafter\firstoftwoarguments }% #2}
       {\expandafter\secondoftwoarguments}% #3}%
   \fi}

\bgroup
\obeylines
\long\gdef\copybufferline#1
  {\processnextbufferline{#1}\closebufferfile{\flushbufferline{#1}\copybufferline}}
\egroup

% kind of obsolete with mkiv

\def\mkstartmemorybuffer
  {\dosingleempty\dostartmemorybuffer}

\long\def\dostartmemorybuffer[#1]#2\stopbuffer
  {\setbuffer[#1]#2\endbuffer}

\protect \endinput