%D \module
%D   [       file=verb-xml,
%D        version=2000.05.09,
%D          title=\CONTEXT\ Verbatim Macros,
%D       subtitle=Pretty XML verbatim,
%D         author=Berend de Boer,
%D           date=2000.05.08,
%D      copyright={Berend de Boer \& Hans Hagen}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.

% This module will be cleaned up a bit in the process of more
% flexible verbatim options.

\writestatus{loading}{Context Support Macros / Pretty XML Verbatim}

\unprotect

%D Formats XML more or less like XMLWriter (http://XMLwriter.net)
%D does.
%D
%D Known bugs:
%D - CDATA not handled yet.
%D
%D Expects well-formed XML. Else parsing errors may occur, because
%D this XML state machine is not robust.
%D
%D Examples:
%D
%D \startXML
%D <?xml version="1.0" encoding="ISO-8859-1" ?>
%D <!-- comment: example of a <resource> tag -->
%D <resources>
%D   <resource id="5">
%D     <capacity>
%D       <kind>1</kind>
%D       <value>100</value>
%D     </capacity>
%D   </resource>
%D </resources>
%D \stopXML
%D
%D Another format:
%D
%D \startXML
%D <?xml version="1.0" encoding="ISO-8859-1" ?>
%D <address id="10"/>
%D \stopXML
%D
%D A typical setup:
%D
%D \setuptyping[XML]
%D   [margin=1cm,
%D   before={\switchtobodyfont[9pt]\blank[medium]},
%D   after={\switchtobodyfont[11pt]\blank[medium]},
%D   letter=\ss]
%D

\ifx\XMLlinebreak\undefined
  \gdef\XMLlinebreak{\ifhmode\allowbreak\fi} % new, often long lines
\fi

\doglobal\newif\ifXMLmarkkeys     \global\XMLmarkkeystrue

\gdef\setupprettyXMLtype%
  {\def\prettyidentifier{XML}%
   \XMLsetvariables
   \XMLsetcontrols
   \XMLsetspecials
   \XMLsethandlers}

\gdef\XMLsetvariables
  {\global\inXMLpifalse
   \global\inXMLtagfalse
   \global\inXMLvaluefalse
   \global\inXMLspecialfalse
   \global\inXMLcommentfalse
   \global\inXMLtagnamefalse
   \global\inXMLattributefalse
   \global\inXMLentityfalse}

\gdef\XMLsetcontrols%
  {\saveprettycontrols
   \def\obeyedspace%
     {\ifinXMLvalue 
      \else % more tests ? 
        \XMLstartattribute
      \fi
      \oldobeyedspace
      \XMLlinebreak}%
   \def\flushrestofverbatimline%
     {\endXMLtagname}%
   \let\obeytabs=\ignoretabs}

\gdef\XMLsetspecials%
  {\setpretty`\<=10 \setpretty`\>=11
   \setpretty`\?=12 \setpretty`\/=13
   \setpretty`\!=14 \setpretty`\-=15
   \setpretty`\\=17
   \setpretty`\0=17
   \setpretty`\1=17 \setpretty`\2=17 \setpretty`\3=17
   \setpretty`\4=17 \setpretty`\5=17 \setpretty`\6=17
   \setpretty`\7=17 \setpretty`\8=17 \setpretty`\9=17
   \setpretty`\==16
   \setpretty`\"=20
   \setpretty`\(=30 \setpretty`\)=30 \setpretty`\,=30
   \setpretty`\*=30 \setpretty`\+=30 \setpretty`\#=30
   \setpretty`\:=30
   \setpretty`\&=41 \setpretty`\;=42 }

\gdef\XMLsethandlers%
  {\installprettyhandler 17 \XMLnormal
   \installprettyhandler 10 \XMLwhattag
   \installprettyhandler 11 \XMLstoptag
   \installprettyhandler 12 \XMLtypeonetwo
   \installprettyhandler 13 \XMLtypeonethree
   \installprettyhandler 14 \XMLtypeonefour
   \installprettyhandler 15 \XMLtypeonefive
   \installprettyhandler 16 \XMLtypeonesix
   \installprettyhandler 20 \XMLdoublequote
   \installprettyhandler 30 \XMLtypethree
   \installprettyhandler 41 \XMLbampersand
   \installprettyhandler 42 \XMLeampersand }

\doglobal\newif\ifinXMLpi
\doglobal\newif\ifinXMLtag
\doglobal\newif\ifinXMLvalue
\doglobal\newif\ifinXMLspecial
\doglobal\newif\ifinXMLcomment
\doglobal\newif\ifinXMLtagname
\doglobal\newif\ifinXMLattribute
\doglobal\newif\ifinXMLentity

% the list of actions to be executed per state

% test if we have a normal tag, processing instruction or a special,
% i.e. <, <? or <!

\gdef\XMLnormal#1{\getpretty{#1}}

\gdef\XMLwhattag%
  {\handlenextnextpretty\XMLdowhattag\XMLstarttag}

\gdef\XMLdowhattag#1#2%
  {\ifinXMLcomment
     \let\next=\getpretties
   \else
     \getprettydata{#2}%
     \ifnum\prettytype=12 % ?
       \let\next=\XMLstartpi
     \else\ifnum\prettytype=14 % !
       \let\next=\XMLstartspecial
     \else
       \let\next=\XMLstarttag
     \fi\fi
   \fi
   \next{#1}{#2}}

% formats <?

\gdef\XMLstartpi#1#2%
  {\beginofpretty[\!!prettythree]\getpretties{#1}{#2}\endofpretty%
   \global\inXMLtagtrue
   \global\inXMLpitrue
   \global\inXMLtagnametrue
   \beginofpretty[\!!prettyone]}

% format <!, <!--, <!DOCTYPE, <![CDATA[ and such

\gdef\XMLstartspecial#1#2%
  {\beginofpretty[\!!prettythree]\getpretties{#1}{#2}\endofpretty%
   \global\inXMLtagtrue
   \global\inXMLspecialtrue
   \global\inXMLtagnametrue
   \beginofpretty[\!!prettyone]}

% formats plain <

\gdef\XMLstarttag#1%
  {\XMLlinebreak
   \beginofpretty[\!!prettythree]\getpretty{#1}\endofpretty
   \global\inXMLtagtrue
   \global\inXMLtagnametrue
   \beginofpretty[\!!prettyone]}


% catch >

\gdef\XMLstoptag#1%
  {\ifinXMLcomment
     \getpretty{#1}%
   \else
     \ifinXMLvalue
       \getpretty{#1}%
     \else
       \endXMLtagname
       \beginofpretty[\!!prettythree]\getpretty{#1}\endofpretty
       \doXMLstoptag
       \XMLlinebreak
     \fi
   \fi}

\gdef\doXMLstoptag%
  {\global\inXMLpifalse       % either end process instruction
   \global\inXMLspecialfalse  % or special
   \global\inXMLtagfalse      % tag ends always
   \global\inXMLtagnamefalse} % just to be sure

% end typeset name of tag
% because called often, we also use it to end the default
% attribute color.

\gdef\endXMLtagname%
 {\ifinXMLtagname
    \endofpretty
    \inXMLtagnamefalse
  \else
    \XMLstopattribute
  \fi}

% start attribute formatting inside a tag if applicable

\gdef\XMLstartattribute%
  {\ifinXMLcomment \else
     \ifinXMLpi 
       \ifXMLmarkkeys\else\endXMLtagname\fi % option
     \else
       \endXMLtagname
       \ifinXMLtag
         \doXMLstartattribute
       \fi
     \fi
   \fi}

\gdef\XMLstopattribute%
  {\ifinXMLattribute
     \endofpretty
     \inXMLattributefalse
   \fi}

\gdef\doXMLstartattribute
  {\inXMLattributetrue
   \beginofpretty[\!!prettythree]}

% `?' character, needed to recognize ?>

\gdef\XMLtypeonetwo%
  {\endXMLtagname
   \handlenextnextpretty\doXMLtypeonetwo\doXMLout}

\gdef\doXMLtypeonetwo#1#2%
  {\getprettydata{#2}%
   \ifnum\prettytype=11 % >
     \expandafter\dododoXMLtypeonetwo
   \else % treat as `green' character
     \expandafter\XMLtypethree
   \fi
   {#1}#2}

\gdef\dododoXMLtypeonetwo#1#2%
  {\ifinXMLcomment
     \getpretties{#1}{#2}%
   \else
     \ifinXMLtag
       \ifinXMLvalue
         \getpretties{#1}{#2}%
       \else
         \ifinXMLpi
           \beginofpretty[\!!prettythree]\getpretties{#1}{#2}\endofpretty
         \else % treat as green character
           \beginofpretty[\!!prettytwo]\getpretty{#1}\endofpretty
           \beginofpretty[\!!prettythree]#2\endofpretty
         \fi
         \doXMLstoptag
       \fi
     \else
       \getpretties{#1}{#2}%
     \fi
   \fi}

% '/' character, catch /> and </, do nothing else

\gdef\XMLtypeonethree#1%
  {\ifinXMLcomment
     \getpretty{#1}%
   \else
     \ifinXMLtag
       \ifinXMLvalue
         \getpretty{#1}%
       \else
         \endofpretty
         \beginofpretty[\!!prettythree]\getpretty{#1}\endofpretty
         \beginofpretty[\!!prettyone]%
       \fi
     \else
       \getpretty{#1}%
     \fi
   \fi}

%  used to parse <!

\gdef\XMLtypeonefour#1%
  {\getpretty{#1}}

% used to parse <!-- and -->
% when <! is parsed we already assumed this is a comment
% when -- is encountered, we only need to see if --> is ahead
% so the comment can stop.

\gdef\XMLtypeonefive%
 {\handlenextnextpretty\doXMLtypeonefive\doXMLout}

\gdef\doXMLtypeonefive#1#2%
  {\getprettydata{#2}%
   \ifnum\prettytype=15
     \ifinXMLcomment
       \let\next=\dodoXMLtypeonefive
     \else
       \ifinXMLspecial
         \let\next=\startXMLcomment
       \else
         \let\next=\doXMLouttwo
       \fi
     \fi
   \else
     \let\next=\doXMLouttwo
   \fi
   \next{#1}#2}

\gdef\startXMLcomment#1#2%
  {\beginofpretty[\!!prettythree]\getpretties{#1}{#2}\endofpretty
   \beginofpretty[\!!prettyfour]%
   \global\inXMLcommenttrue}

\gdef\dodoXMLtypeonefive#1% encountered -
  {\def\prev{#1}\handlenextnextpretty\dododoXMLtypeonefive\doXMLout}

\gdef\nodoXMLtypeonefive% encountered -
  {\getpretty{\prev}\doXMLout}

\gdef\dododoXMLtypeonefive#1#2%
  {\getprettydata{#2}%
   \ifnum\prettytype=11
     \endofpretty\getpretty{\prev}#1\empty\global\inXMLcommentfalse#2%
   \else
     \getpretty{\prev}#1#2%
   \fi}

\global\let\doXMLout   \getpretty
\global\let\doXMLouttwo\getpretties

% '=' inside tags needs to be blue

\gdef\XMLtypeonesix#1%
  {\ifinXMLtag
     \endofpretty
     \beginofpretty[\!!prettythree]\getpretty{#1}\endofpretty
     \beginofpretty[\!!prettyone]%
   \else
     \getpretty{#1}%
   \fi}

% catch attribute value parts

\gdef\XMLdoublequote#1%
  {\ifinXMLcomment
     \getpretty{#1}%
   \else
     \ifinXMLtag
       \ifinXMLvalue
         \global\inXMLvaluefalse
         \beginofpretty[\!!prettythree]\getpretty{#1}\endofpretty
         \ifXMLmarkkeys\beginofpretty[\!!prettyone]\fi
       \else
         \endofpretty
         \beginofpretty[\!!prettythree]\getpretty{#1}\endofpretty
         \global\inXMLvaluetrue
       \fi
     \else
       \getpretty{#1}%
     \fi
   \fi}

% symbols like `(', `)' and `,' should be green

\gdef\XMLtypethree#1%
  {\ifinXMLcomment
     \getpretty{#1}%
   \else
     \ifinXMLtag
       \endXMLtagname
       \ifinXMLvalue
         \getpretty{#1}%
       \else
         \beginofpretty[\!!prettytwo]\getpretty{#1}\endofpretty
         \XMLstartattribute% again
       \fi
     \else
       \getpretty{#1}%
     \fi
   \fi}

% special characters with `&'

\gdef\XMLbampersand#1%
  {\ifinXMLcomment
     \getpretty{#1}%
   \else
     \endXMLtagname
     \beginofpretty[\!!prettytwo]\getpretty{#1}\endofpretty
     \global\inXMLentitytrue
   \fi}

\gdef\XMLeampersand#1%
  {\ifinXMLcomment
     \getpretty{#1}%
   \else
     \beginofpretty[\!!prettytwo]\getpretty{#1}\endofpretty
     \global\inXMLentityfalse
   \fi}

\protect \endinput
